/* ── Reset ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Variables ─────────────────────────────────── */
:root {
  --bg:           #0a0a0b;
  --surface:      #18181b;
  --surface2:     #232327;
  --border:       #27272a;
  --text:         #f4f4f5;
  --muted:        #a1a1aa;
  --primary:      #ee72f1;
  --primary2:     #ec4899;
  --primary-glow: rgba(238, 114, 241, 0.18);
  --danger:       #f85149;
  --danger2:      #da3633;

  --web:              #818cf8;
  --machine:          #ee72f1;
  --cve:              #10b981;
  --crypto:           #a371f7;
  --pwn:              #f85149;
  --reverse:          #f59e0b;
  --mobile:           #22d3ee;
  --linux:            #fb923c;
  --windows:          #60a5fa;
  --active-directory: #f472b6;
  --network:          #34d399;
  --misc:             #a1a1aa;
}

/* ── Base ──────────────────────────────────────── */
html { background: var(--bg); }

body {
  background: transparent;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-size: clamp(18px, 1.25vw, 24px);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Page background effect (challenges / skills / profile) ── */
/* Dot grid + corner glows as pure CSS background layers.      */
/* Zero JS, zero canvas — GPU background-image only.           */
body.page-bg {
  background:
    /* dot grid */
    radial-gradient(circle, rgba(238,114,241,0.18) 1px, transparent 1px)
      center center / 44px 44px fixed,
    /* cross-lines */
    linear-gradient(rgba(238,114,241,0.06) 1px, transparent 1px)
      0 0 / 44px 44px fixed,
    linear-gradient(90deg, rgba(238,114,241,0.06) 1px, transparent 1px)
      0 0 / 44px 44px fixed;
}

body.page-bg::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 55vw 50vh at 8%  65%, rgba(238,114,241,0.18) 0%, transparent 65%),
    radial-gradient(ellipse 45vw 40vh at 92% 15%, rgba(236, 72,153,0.14) 0%, transparent 65%);
  animation: page-glow 45s ease-in-out infinite alternate;
}

@keyframes page-glow {
  from { transform: translate(  0px,   0px); }
  to   { transform: translate(-45px,  22px); }
}

/* ── Navbar ────────────────────────────────────── */
.navbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 24px rgba(238, 114, 241, 0.06);
  height: 70px;
  padding: 0 clamp(24px, 4vw, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: clamp(18px, 1.4vw, 26px);
  font-weight: 600;
  color: var(--text);
}
.nav-brand:hover { color: var(--primary); text-decoration: none; }
.nav-logo { width: 42px; height: 42px; object-fit: contain; flex-shrink: 0; }

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(20px, 2vw, 40px);
}
.nav-links a { color: var(--muted); font-size: clamp(15px, 1.1vw, 20px); }
.nav-links a:hover { color: var(--primary); text-decoration: none; text-shadow: 0 0 12px var(--primary-glow); }
.nav-logout-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: clamp(15px, 1.1vw, 20px);
  padding: 0;
  font-family: inherit;
}
.nav-logout-btn:hover { color: var(--text); }

/* ── Navbar VPN indicator ─────────────────────── */
.nav-vpn {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  text-decoration: none;
  font-family: inherit;
  font-size: 18px;
  line-height: 1.4;
  color: var(--muted);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.nav-vpn:hover {
  border-color: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
}

.nav-vpn-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  flex-shrink: 0;
}
.nav-vpn-connected {
  background: #3fb950;
  box-shadow: 0 0 6px rgba(63, 185, 80, 0.6);
  animation: pulse 2s ease-in-out infinite;
}
.nav-vpn-disconnected {
  background: var(--muted);
}

.nav-vpn-label {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  text-decoration: none;
}
.nav-vpn-label:hover {
  color: var(--text);
  text-decoration: none;
}
.nav-vpn-state {
  font-weight: 400;
}
.nav-vpn-state-online {
  color: #3fb950;
}
.nav-vpn-ip {
  color: #d4d4d8;
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 20px;
  letter-spacing: 0.2px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-align: left;
  white-space: nowrap;
}
.nav-vpn-ip:hover {
  color: var(--text);
}
.nav-vpn-worker {
  color: var(--muted);
  opacity: 0.7;
  white-space: nowrap;
}

/* ── Navbar status group (VPN + active instance) ── */
.nav-status-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-instance {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 42px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  font-size: 18px;
  line-height: 1.4;
}
.nav-instance-meta {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}
.nav-instance-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.nav-instance-active {
  background: #3fb950;
  box-shadow: 0 0 6px rgba(63, 185, 80, 0.6);
  animation: pulse 2s ease-in-out infinite;
}
.nav-instance-inactive {
  background: var(--muted);
  box-shadow: none;
  animation: none;
}
.nav-instance-name {
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
}
.nav-instance-name:hover {
  color: var(--primary);
  text-decoration: none;
}
.nav-instance-empty {
  color: var(--muted);
  white-space: nowrap;
}
.nav-instance-ip {
  color: #d4d4d8;
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 20px;
  letter-spacing: 0.2px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-align: left;
  white-space: nowrap;
}
.nav-instance-ip:hover {
  color: var(--text);
}
.nav-instance-timer {
  color: var(--muted);
  font-family: monospace;
  white-space: nowrap;
}
.nav-instance-stop {
  background: color-mix(in srgb, var(--danger) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--danger) 40%, transparent);
  border-radius: 4px;
  cursor: pointer;
  color: var(--danger);
  padding: 5px 7px;
  display: inline-flex;
  align-items: center;
  transition: background 0.12s, border-color 0.12s;
}
.nav-instance-extend {
  background: color-mix(in srgb, #d29922 15%, transparent);
  border: 1px solid color-mix(in srgb, #d29922 40%, transparent);
  border-radius: 4px;
  cursor: pointer;
  color: #d29922;
  padding: 5px 7px;
  display: inline-flex;
  align-items: center;
  transition: background 0.12s, border-color 0.12s;
}
.nav-instance-extend:hover {
  background: color-mix(in srgb, #d29922 25%, transparent);
  border-color: #d29922;
}
.nav-instance-stop:hover {
  background: color-mix(in srgb, var(--danger) 25%, transparent);
  border-color: var(--danger);
}

/* ── Container ─────────────────────────────────── */
.container {
  max-width: min(1400px, 88vw);
  margin: 0 auto;
  padding: clamp(32px, 3vw, 56px) clamp(24px, 3vw, 48px);
}

/* ── Buttons ───────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text);
  text-decoration: none;
  transition: background 0.1s, border-color 0.1s;
  white-space: nowrap;
  line-height: 1.5;
}
.btn:hover { background: var(--surface); border-color: var(--muted); text-decoration: none; }

.btn-primary  { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 0 16px var(--primary-glow); }
.btn-primary:hover { background: var(--primary2); border-color: var(--primary2); box-shadow: 0 0 24px var(--primary-glow); }

.btn-secondary { background: transparent; border-color: var(--border); color: var(--muted); }
.btn-secondary:hover { border-color: var(--muted); color: var(--text); }

.btn-danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger2); border-color: var(--danger2); }

.btn-success { background: #238636; border-color: #238636; color: #fff; }
.btn-success:hover { background: #2ea043; border-color: #2ea043; }

.btn-warning { background: #9e6a03; border-color: #9e6a03; color: #fff; }
.btn-warning:hover { background: #b07e10; border-color: #b07e10; }

.btn-sm { padding: 4px 12px; font-size: 13px; }
.btn-icon { display: inline-flex; align-items: center; justify-content: center; padding: 10px 14px; }
.btn-full { width: 100%; text-align: center; display: block; padding-top: 14px; padding-bottom: 14px; font-size: 16px; }

/* ── Alert ─────────────────────────────────────── */
.alert {
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 15px;
  margin-bottom: 20px;
}
.alert-error {
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
  color: var(--danger);
}

/* ── Login page ────────────────────────────────── */
.login-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding-bottom: 10vh;
}

.login-card {
  background: rgba(24, 24, 27, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(238, 114, 241, 0.25);
  border-radius: 20px;
  padding: 80px 80px;
  width: fit-content;
  min-width: min(820px, 92vw);
  text-align: center;
  box-shadow: 0 0 0 1px rgba(238, 114, 241, 0.08),
              0 0 60px rgba(238, 114, 241, 0.12),
              0 32px 64px rgba(0, 0, 0, 0.5);
}
.login-logo { width: 140px; height: 140px; object-fit: contain; margin-bottom: 32px; }
.login-card h1 { font-size: 44px; font-weight: 700; margin-bottom: 16px; letter-spacing: -0.5px; white-space: nowrap; }
.subtitle { color: var(--muted); margin-bottom: 44px; font-size: 20px; line-height: 1.6; }

/* ── Page title ────────────────────────────────── */
.page-title { font-size: 32px; font-weight: 600; margin-bottom: 10px; }
.page-subtitle { color: var(--muted); font-size: 24px; margin-bottom: 52px; }

/* ── Category badges ───────────────────────────── */
.category-badge {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.category-badge-lg {
  font-size: 17px;
  padding: 10px 18px;
  letter-spacing: 0.6px;
  min-width: 200px;
  text-align: center;
}

.category-machine          { background: color-mix(in srgb, var(--machine)              18%, transparent); color: var(--machine);              border: 1px solid color-mix(in srgb, var(--machine)              35%, transparent); }
.category-web              { background: color-mix(in srgb, var(--web)              18%, transparent); color: var(--web);              border: 1px solid color-mix(in srgb, var(--web)              35%, transparent); }
.category-cve              { background: color-mix(in srgb, var(--cve)              18%, transparent); color: var(--cve);              border: 1px solid color-mix(in srgb, var(--cve)              35%, transparent); }
.category-crypto           { background: color-mix(in srgb, var(--crypto)           18%, transparent); color: var(--crypto);           border: 1px solid color-mix(in srgb, var(--crypto)           35%, transparent); }
.category-pwn              { background: color-mix(in srgb, var(--pwn)              18%, transparent); color: var(--pwn);              border: 1px solid color-mix(in srgb, var(--pwn)              35%, transparent); }
.category-reverse          { background: color-mix(in srgb, var(--reverse)          18%, transparent); color: var(--reverse);          border: 1px solid color-mix(in srgb, var(--reverse)          35%, transparent); }
.category-mobile           { background: color-mix(in srgb, var(--mobile)           18%, transparent); color: var(--mobile);           border: 1px solid color-mix(in srgb, var(--mobile)           35%, transparent); }
.category-linux            { background: color-mix(in srgb, var(--linux)            18%, transparent); color: var(--linux);            border: 1px solid color-mix(in srgb, var(--linux)            35%, transparent); }
.category-windows          { background: color-mix(in srgb, var(--windows)          18%, transparent); color: var(--windows);          border: 1px solid color-mix(in srgb, var(--windows)          35%, transparent); }
.category-active-directory { background: color-mix(in srgb, var(--active-directory) 18%, transparent); color: var(--active-directory); border: 1px solid color-mix(in srgb, var(--active-directory) 35%, transparent); }
.category-network          { background: color-mix(in srgb, var(--network)          18%, transparent); color: var(--network);          border: 1px solid color-mix(in srgb, var(--network)          35%, transparent); }
.category-misc             { background: color-mix(in srgb, var(--misc)             18%, transparent); color: var(--misc);             border: 1px solid color-mix(in srgb, var(--misc)             35%, transparent); }

/* ── Difficulty badges ─────────────────────────── */
.difficulty-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  flex-shrink: 0;
}

.difficulty-easy   { background: color-mix(in srgb, #3fb950 18%, transparent); color: #3fb950; border: 1px solid color-mix(in srgb, #3fb950 35%, transparent); }
.difficulty-medium { background: color-mix(in srgb, #d29922 18%, transparent); color: #d29922; border: 1px solid color-mix(in srgb, #d29922 35%, transparent); }
.difficulty-hard   { background: color-mix(in srgb, #f85149 18%, transparent); color: #f85149; border: 1px solid color-mix(in srgb, #f85149 35%, transparent); }
.difficulty-insane { background: color-mix(in srgb, #a371f7 18%, transparent); color: #a371f7; border: 1px solid color-mix(in srgb, #a371f7 35%, transparent); }

/* ── Challenges page layout ─────────────────────── */
.challenges-layout {
  display: block;  /* sidenav is fixed, main fills full container */
}

.challenges-main {
  width: 100%;
  min-width: 0;
}

.challenges-sidenav {
  display: none;
}

@media (min-width: 1400px) {
  .challenges-sidenav {
    display: block;
    position: fixed;
    top: 0;
    left: 80px;
    width: 350px;
    padding-top: calc(120px); /* navbar height + breathing room */
    z-index: 10;
  }
  .filter-bar.filter-bar-mobile { display: none !important; }
}

.sidenav-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidenav-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 24px;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.sidenav-item:hover {
  background: var(--surface2);
  color: var(--text);
  text-decoration: none;
}

.sidenav-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.sidenav-icon {
  font-size: 18px;
  flex-shrink: 0;
  width: 22px;
  text-align: center;
  line-height: 1;
}

.sidenav-name {
  flex: 1;
  text-transform: capitalize;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidenav-count {
  color: var(--muted);
  font-size: 24px;
  white-space: nowrap;
}

.category-dot-machine              { background: var(--machine); }
.category-dot-web                  { background: var(--web); }
.category-dot-cve                  { background: var(--cve); }
.category-dot-crypto               { background: var(--crypto); }
.category-dot-pwn                  { background: var(--pwn); }
.category-dot-reverse              { background: var(--reverse); }
.category-dot-mobile               { background: var(--mobile); }
.category-dot-linux                { background: var(--linux); }
.category-dot-windows              { background: var(--windows); }
.category-dot-active-directory     { background: var(--active-directory); }
.category-dot-network              { background: var(--network); }
.category-dot-misc                 { background: var(--misc); }

/* ── Sidenav filters ────────────────────────────── */
.sidenav-filters {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidenav-filter-group {
  padding-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidenav-filter-heading {
  font-size: 16px;
  font-weight: 700;
  color: #f0c040;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 6px 14px;
  background: rgba(240, 192, 64, 0.08);
  border-radius: 8px;
  border-left: 3px solid #f0c040;
}

.sidenav-filter-options {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidenav-filter-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 18px;
  padding: 10px 14px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-transform: capitalize;
  text-align: left;
  line-height: 1.3;
}
.sidenav-filter-btn:hover {
  background: var(--surface2);
  color: var(--text);
}
.sidenav-filter-btn.active {
  background: color-mix(in srgb, var(--primary) 15%, transparent);
  border-color: color-mix(in srgb, var(--primary) 40%, transparent);
  color: var(--primary);
  font-weight: 600;
  box-shadow: 0 0 6px var(--primary-glow);
}

/* ── Difficulty slider ─────────────────────────── */
.diff-slider {
  padding: 8px 4px 4px;
}

.diff-slider-input {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 99px;
  background: linear-gradient(to right, #3fb950, #d29922, #f85149, #a371f7);
  outline: none;
  cursor: pointer;
}
.diff-slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text);
  border: 3px solid var(--surface);
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.5);
  cursor: pointer;
  transition: transform 0.15s;
}
.diff-slider-input::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}
.diff-slider-input::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text);
  border: 3px solid var(--surface);
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.5);
  cursor: pointer;
}

.diff-slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
}

.diff-slider-label {
  font-size: 14px;
  color: var(--muted);
  cursor: pointer;
  padding: 2px 0;
  transition: color 0.15s, font-weight 0.15s;
  text-align: center;
}
.diff-slider-label:hover { color: var(--text); }
.diff-slider-label.active { font-weight: 700; }
.diff-slider-label.active[data-index="0"] { color: var(--text); }
.diff-slider-label.active[data-index="1"] { color: #3fb950; }
.diff-slider-label.active[data-index="2"] { color: #d29922; }
.diff-slider-label.active[data-index="3"] { color: #f85149; }
.diff-slider-label.active[data-index="4"] { color: #a371f7; }

/* ── Status toggle ─────────────────────────────── */
.status-toggle {
  display: flex;
  gap: 6px;
}

.status-toggle-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 4px;
  border-radius: 10px;
  border: 2px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s, box-shadow 0.2s;
  font-family: inherit;
}
.status-toggle-btn:hover {
  border-color: var(--muted);
  background: var(--surface2);
  transform: translateY(-1px);
}
.status-toggle-btn.active {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  box-shadow: 0 0 12px var(--primary-glow);
}

.status-toggle-text {
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--muted);
  transition: color 0.2s;
}
.status-toggle-btn.active .status-toggle-text {
  color: var(--primary);
}

/* ── Filter bar (mobile only) ──────────────────── */
.filter-bar {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 36px;
  margin-bottom: 52px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 18px 28px;
  flex-wrap: wrap;
}
.filter-group + .filter-group {
  border-top: 1px solid var(--border);
}

.filter-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  width: 76px;
  flex-shrink: 0;
}

.filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-pill {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--muted);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  padding: 5px 16px;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  text-transform: capitalize;
  line-height: 1.4;
}
.filter-pill:hover {
  border-color: var(--primary);
  color: var(--text);
}
.filter-pill.active {
  background: color-mix(in srgb, var(--primary) 18%, transparent);
  border-color: color-mix(in srgb, var(--primary) 50%, transparent);
  color: var(--primary);
  font-weight: 600;
  box-shadow: 0 0 8px var(--primary-glow);
}

/* ── Challenge list ────────────────────────────── */
.category-section { margin-bottom: 44px; }
.category-section + .category-section { border-top: 1px solid var(--border); padding-top: 44px; }

.category-heading {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 16px;
}

.category-heading-top {
  display: flex;
  align-items: center;
  gap: 20px;
}

.category-description {
  font-size: 20px;
  color: var(--muted);
  font-weight: 400;
  margin: 0;
  text-transform: none;
  letter-spacing: 0;
}
.category-count { color: var(--muted); font-size: 15px; font-weight: 400; }

.category-progress {
  display: flex;
  align-items: center;
  gap: 10px;
}

.category-progress-bar {
  flex: 1;
  height: 18px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
  width: 320px;
}

.category-progress-fill {
  height: 100%;
  border-radius: 99px;
  transition: width 0.4s ease;
  background: var(--primary);
}

.category-progress-fill.category-progress-machine              { background: var(--web); }
.category-progress-fill.category-progress-web              { background: var(--web); }
.category-progress-fill.category-progress-cve              { background: var(--cve); }
.category-progress-fill.category-progress-pwn              { background: var(--pwn); }
.category-progress-fill.category-progress-reverse          { background: var(--reverse); }
.category-progress-fill.category-progress-crypto           { background: var(--crypto); }
.category-progress-fill.category-progress-mobile           { background: #f78166; }
.category-progress-fill.category-progress-linux            { background: #e3b341; }
.category-progress-fill.category-progress-windows         { background: #79c0ff; }
.category-progress-fill.category-progress-active-directory { background: var(--active-directory); }
.category-progress-fill.category-progress-network         { background: var(--network); }
.category-progress-fill.category-progress-misc             { background: var(--misc); }

.category-progress-label {
  font-size: 22px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.challenge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(clamp(280px, 28vw, 420px), 1fr));
  gap: 14px;
}

.challenge-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  color: var(--text);
  transition: border-color 0.12s, background 0.12s;
}
.challenge-card:hover {
  border-color: var(--primary);
  background: var(--surface2);
  text-decoration: none;
}

.challenge-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.challenge-card-title-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-width: 0;
  flex-wrap: wrap;
}

.challenge-title { font-weight: 600; font-size: 16px; }

.detail-badges { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }

.detail-difficulty-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  line-height: 1;
}

.challenge-desc {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 12px;
  line-height: 1.5;
}

.challenge-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.meta-item {
  font-size: 13px;
  color: var(--muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 8px;
}

/* ── Challenge detail ──────────────────────────── */
.detail-page {
  position: relative;
  max-width: 1400px;
  display: flex;
  gap: 48px;
  align-items: flex-start;
}

.page-notifications {
  position: fixed;
  top: 94px;
  right: clamp(18px, 3vw, 36px);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: min(360px, calc(100vw - 36px));
  pointer-events: none;
}

.page-notification {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 14px 14px 16px;
  border-radius: 12px;
  border: 1px solid color-mix(in srgb, var(--border) 80%, transparent);
  background:
    linear-gradient(135deg, rgba(255,255,255,0.04), transparent 70%),
    color-mix(in srgb, var(--surface) 92%, black);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateX(18px);
  transition: opacity 0.18s ease, transform 0.18s ease;
  pointer-events: auto;
}

.page-notification.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.page-notification-indicator {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--primary);
  box-shadow: 0 0 12px var(--primary-glow);
  flex-shrink: 0;
}

.page-notification-success {
  border-color: color-mix(in srgb, #3fb950 40%, transparent);
}

.page-notification-success .page-notification-indicator {
  background: #3fb950;
  box-shadow: 0 0 12px rgba(63, 185, 80, 0.45);
}

.page-notification-text {
  color: var(--text);
  font-size: 14px;
  line-height: 1.4;
  flex: 1;
}

.page-notification-close {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.page-notification-close:hover {
  color: var(--text);
}

/* ── Left sidebar ── */
.detail-sidebar {
  position: sticky;
  top: 90px;
  width: 280px;
  flex-shrink: 0;
  order: 1;
  display: none;
}

/* ── Content (right, larger) ── */
.detail-content {
  flex: 1;
  min-width: 0;
  order: 2;
}

@media (min-width: 1100px) {
  .detail-sidebar { display: flex; flex-direction: column; gap: 24px; }
}

.detail-sidebar-meta {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.detail-sidebar-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.detail-sidebar-title {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.3;
}
.detail-edit-icon {
  color: var(--muted);
  flex-shrink: 0;
  transition: color 0.15s;
}
.detail-edit-icon:hover {
  color: var(--primary);
  text-decoration: none;
}

.detail-sidebar-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.detail-sidebar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.detail-sidebar-row-label {
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  font-weight: 600;
}
.detail-sidebar-row-value {
  display: flex;
  align-items: center;
  gap: 8px;
}
.detail-sidebar-row-value .sidenav-icon {
  font-size: 16px;
}

.detail-sidebar-url {
  font-family: monospace;
  font-size: 13px;
  color: var(--primary);
  word-break: break-all;
}
.detail-sidebar-files {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.detail-sidebar-file {
  font-size: 13px;
  color: var(--primary);
}

.detail-sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.detail-nav-item {
  display: block;
  padding: 10px 14px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
  transition: background 0.12s, color 0.12s;
}
.detail-nav-item:hover {
  background: var(--surface2);
  color: var(--text);
  text-decoration: none;
}
.detail-nav-item.active {
  background: var(--surface);
  color: var(--text);
}

/* Connected sections — one continuous block */
.detail-block {
  background: var(--surface);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 28px 32px;
  scroll-margin-top: 80px;
  font-size: 18px;
}
.detail-block-first {
  border-top: 1px solid var(--border);
  border-radius: 8px 8px 0 0;
}
.detail-block-last {
  border-radius: 0 0 8px 8px;
}
.detail-block-first.detail-block-last {
  border-radius: 8px;
}

.detail-block-heading {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}

/* ── Description markdown content ── */
.detail-description {
  color: var(--text);
  font-size: 21px;
  line-height: 1.7;
}
.detail-description p {
  margin-bottom: 12px;
}
.detail-description p:last-child {
  margin-bottom: 0;
}
.detail-description img {
  max-width: 100%;
  border-radius: 6px;
  margin: 12px 0;
}
.detail-description code {
  font-family: monospace;
  font-size: 0.9em;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 2px 6px;
}
.detail-description pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  margin: 12px 0;
}
.detail-description pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 14px;
  line-height: 1.5;
}
.detail-description ul,
.detail-description ol {
  margin: 8px 0 8px 20px;
}
.detail-description li {
  margin-bottom: 4px;
}
.detail-description strong {
  font-weight: 700;
}

.detail-block-empty {
  color: var(--muted);
}

.detail-solved-banner {
  display: flex;
  align-items: center;
  gap: 16px;
  border: 1px solid rgba(63, 185, 80, 0.4);
  background: rgba(63, 185, 80, 0.05);
  border-radius: 8px;
  padding: 20px 24px;
}
.detail-solved-banner strong {
  display: block;
  color: #3fb950;
  font-size: 1em;
}

/* Instance boxes inside the detail block don't need extra margin */
.detail-block .instance-box { margin: 0; }
.detail-block .instance-section { margin-bottom: 0; }
.detail-block .alert { margin-bottom: 16px; }

.challenge-url {
  font-family: monospace;
  font-size: 15px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 14px;
  display: inline-block;
  word-break: break-all;
}

.file-list { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.file-link { font-size: 15px; }

.back-link { color: var(--muted); font-size: 15px; }

/* ── Profile ───────────────────────────────────── */
.profile-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 16px;
}
.profile-row {
  display: flex;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}
.profile-row:last-child { border-bottom: none; }
.profile-label { width: 200px; color: var(--muted); font-size: 22px; flex-shrink: 0; }
.profile-value { font-size: 22px; }
.profile-note  { color: var(--muted); font-size: 14px; }

/* ── Progression ─────────────────────────────────── */
.progression-section {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.progression-overview {
  position: relative;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--primary) 28%, transparent);
  border-radius: 20px;
  background:
    radial-gradient(circle at 12% 24%, rgba(238, 114, 241, 0.16), transparent 28%),
    radial-gradient(circle at 88% 78%, rgba(163, 113, 247, 0.18), transparent 30%),
    linear-gradient(145deg, rgba(255,255,255,0.05), transparent 55%),
    var(--surface);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.22);
}

.progression-overview::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, transparent 0%, rgba(255,255,255,0.07) 35%, transparent 62%);
  transform: translateX(-100%);
  animation: progression-overview-sheen 5.5s linear infinite;
  pointer-events: none;
}

.progression-overview-copy {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 30px 32px;
}

.progression-overview-kicker {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #f3c4ff;
}

.progression-overview-heading-row {
  display: flex;
  align-items: flex-end;
  gap: 18px;
  flex-wrap: wrap;
}

.progression-overview-percent {
  font-size: clamp(64px, 10vw, 116px);
  line-height: 0.88;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--text);
  text-shadow: 0 0 24px rgba(238, 114, 241, 0.16);
}

.progression-overview-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: 10px;
}

.progression-overview-meta strong {
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  color: var(--text);
}

.progression-overview-meta span {
  color: var(--muted);
  font-size: 16px;
  max-width: 560px;
}

.progression-overview-bar {
  position: relative;
  height: 18px;
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in srgb, var(--primary) 10%, var(--surface2));
  border: 1px solid color-mix(in srgb, var(--primary) 22%, transparent);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.05), inset 0 -12px 24px rgba(0,0,0,0.22);
}

.progression-overview-bar-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary2), var(--primary), var(--crypto));
  box-shadow: 0 0 30px rgba(238, 114, 241, 0.26);
}

.progression-overview-bar-fill::after {
  content: "";
  display: block;
  height: 100%;
  background: linear-gradient(180deg, rgba(255,255,255,0.28), transparent 58%);
}

.progression-hero {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.progression-stat {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  min-height: 180px;
  padding: 28px 30px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background:
    linear-gradient(140deg, rgba(255,255,255,0.04), transparent 55%),
    var(--surface);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
  overflow: hidden;
}

.progression-stat::before {
  content: "";
  position: absolute;
  inset: auto -40px -50px auto;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  opacity: 0.18;
  pointer-events: none;
}

.progression-stat-challenges::before {
  background: radial-gradient(circle, var(--primary), transparent 68%);
}

.progression-stat-skills::before {
  background: radial-gradient(circle, var(--crypto), transparent 68%);
}

.progression-stat-label {
  position: relative;
  z-index: 1;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.progression-stat-value-row {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.progression-stat-value {
  font-size: clamp(56px, 7vw, 88px);
  line-height: 0.95;
  font-weight: 800;
  color: var(--text);
}

.progression-stat-total {
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1;
  font-weight: 700;
  color: var(--muted);
}

.prog-section-heading {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 16px;
  margin-bottom: 2px;
}

.progression-category-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.progression-category-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 20px 20px 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background:
    linear-gradient(145deg, rgba(255,255,255,0.04), transparent 58%),
    var(--surface);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.14);
  overflow: hidden;
}

.progression-category-card::before {
  content: "";
  position: absolute;
  top: -36px;
  right: -36px;
  width: 108px;
  height: 108px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.08), transparent 68%);
  pointer-events: none;
}

.progression-category-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.progression-category-title {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.progression-category-icon {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: color-mix(in srgb, var(--surface2) 92%, transparent);
  border: 1px solid var(--border);
  font-size: 20px;
  flex-shrink: 0;
}

.progression-category-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  text-transform: capitalize;
}

.progression-category-pct {
  font-size: 24px;
  font-weight: 800;
  color: var(--text);
  flex-shrink: 0;
}

.progression-category-stats {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.progression-category-ratio {
  font-size: 26px;
  line-height: 1;
  font-weight: 800;
  color: var(--text);
}

.progression-category-remaining {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.progression-category-bar {
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in srgb, var(--surface2) 90%, transparent);
  border: 1px solid var(--border);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.progression-category-bar-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  box-shadow: 0 0 18px rgba(255,255,255,0.08);
}

.progression-category-bar-fill.category-progress-machine          { background: color-mix(in srgb, var(--machine)          70%, transparent); }
.progression-category-bar-fill.category-progress-web              { background: color-mix(in srgb, var(--web)              70%, transparent); }
.progression-category-bar-fill.category-progress-cve              { background: color-mix(in srgb, var(--cve)              70%, transparent); }
.progression-category-bar-fill.category-progress-crypto           { background: color-mix(in srgb, var(--crypto)           70%, transparent); }
.progression-category-bar-fill.category-progress-pwn              { background: color-mix(in srgb, var(--pwn)              70%, transparent); }
.progression-category-bar-fill.category-progress-reverse          { background: color-mix(in srgb, var(--reverse)          70%, transparent); }
.progression-category-bar-fill.category-progress-mobile           { background: color-mix(in srgb, #f78166               70%, transparent); }
.progression-category-bar-fill.category-progress-linux            { background: color-mix(in srgb, #e3b341               70%, transparent); }
.progression-category-bar-fill.category-progress-windows          { background: color-mix(in srgb, #79c0ff               70%, transparent); }
.progression-category-bar-fill.category-progress-active-directory { background: color-mix(in srgb, var(--active-directory) 70%, transparent); }
.progression-category-bar-fill.category-progress-network          { background: color-mix(in srgb, var(--network)          70%, transparent); }
.progression-category-bar-fill.category-progress-misc             { background: color-mix(in srgb, var(--misc)             70%, transparent); }

.submission-feed {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  background: var(--surface);
}

.submission-feed-head,
.submission-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 18px;
  align-items: center;
  padding: 16px 20px;
}

.submission-feed-head {
  background: color-mix(in srgb, var(--surface2) 92%, transparent);
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.submission-row {
  border-bottom: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
}

.submission-row:last-child {
  border-bottom: none;
}

.submission-machine {
  color: var(--muted);
  font-size: 15px;
  font-weight: 600;
}

a.submission-machine:hover {
  color: var(--text);
  text-decoration: none;
}

a.submission-machine:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--primary) 75%, white);
  outline-offset: 2px;
  border-radius: 4px;
  text-decoration: none;
}

.submission-time {
  color: var(--text);
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 17px;
  font-weight: 700;
}

.submission-empty {
  padding: 20px;
  color: var(--muted);
}

.prog-bar {
  position: relative;
  height: 56px;
  background: var(--surface2);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.prog-bar-sm {
  height: 40px;
}

.prog-bar-fill {
  position: absolute;
  inset: 0;
  width: 0;
  background: color-mix(in srgb, var(--primary) 55%, transparent);
  border-radius: 8px;
  transition: width 0.5s ease;
}

.prog-bar-fill-skills {
  background: color-mix(in srgb, var(--crypto) 55%, transparent);
}

/* reuse the existing category-progress-* fill classes — override opacity */
.prog-bar .category-progress-machine              { background: color-mix(in srgb, var(--machine)          55%, transparent); }
.prog-bar .category-progress-web                  { background: color-mix(in srgb, var(--web)              55%, transparent); }
.prog-bar .category-progress-cve                  { background: color-mix(in srgb, var(--cve)              55%, transparent); }
.prog-bar .category-progress-crypto               { background: color-mix(in srgb, var(--crypto)           55%, transparent); }
.prog-bar .category-progress-pwn                  { background: color-mix(in srgb, var(--pwn)              55%, transparent); }
.prog-bar .category-progress-reverse              { background: color-mix(in srgb, var(--reverse)          55%, transparent); }
.prog-bar .category-progress-mobile               { background: color-mix(in srgb, #f78166               55%, transparent); }
.prog-bar .category-progress-linux                { background: color-mix(in srgb, #e3b341               55%, transparent); }
.prog-bar .category-progress-windows              { background: color-mix(in srgb, #79c0ff               55%, transparent); }
.prog-bar .category-progress-active-directory     { background: color-mix(in srgb, var(--active-directory) 55%, transparent); }
.prog-bar .category-progress-network              { background: color-mix(in srgb, var(--network)         55%, transparent); }
.prog-bar .category-progress-misc                 { background: color-mix(in srgb, var(--misc)             55%, transparent); }

.prog-bar-content {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 1;
}

.prog-bar-label {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  text-transform: capitalize;
}

.prog-bar-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

@media (max-width: 760px) {
  .progression-overview-copy {
    padding: 24px 22px;
    gap: 16px;
  }

  .progression-overview-meta {
    padding-bottom: 0;
  }

  .progression-overview-bar {
    height: 16px;
  }

  .progression-hero {
    grid-template-columns: 1fr;
  }

  .progression-category-grid {
    grid-template-columns: 1fr;
  }

  .submission-feed-head,
  .submission-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .submission-feed-head {
    display: none;
  }

  .submission-row {
    padding: 18px 18px;
  }

  .progression-stat {
    min-height: 150px;
    padding: 22px 22px;
    gap: 14px;
  }
}

@keyframes progression-overview-sheen {
  to { transform: translateX(100%); }
}

.badge-admin {
  background: color-mix(in srgb, var(--primary) 18%, transparent);
  color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 35%, transparent);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

/* ── Admin Skills page ─────────────────────────── */
.admin-skills-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: start;
}

.admin-skills-form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 36px;
}

.admin-skills-form .form-group {
  margin-bottom: 20px;
}

.admin-skills-form-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 24px;
}

.admin-skills-category {
  margin-bottom: 24px;
}

.admin-skills-cat-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.admin-skills-pills {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.admin-skill-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.admin-skill-name {
  font-size: 14px;
}

/* ── Skills checkboxes in challenge form ───────── */
.skills-checkbox-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 4px 0;
}

.skill-checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  background: var(--surface);
  transition: border-color 0.15s, background 0.15s;
}

.skill-checkbox-label:hover {
  border-color: var(--primary);
}

.skill-checkbox-label input[type="checkbox"] {
  accent-color: var(--primary);
}

/* ── Admin table ───────────────────────────────── */
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 28px;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.admin-table th {
  background: var(--surface2);
  padding: 12px 18px;
  text-align: left;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
}
.admin-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
  vertical-align: middle;
}
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--surface2); }
.table-actions { display: flex; gap: 6px; align-items: center; }
.table-empty { text-align: center; color: var(--muted); padding: 36px !important; }

/* ── Forms ─────────────────────────────────────── */
.form-page { max-width: 640px; }

.challenge-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 1200px;
}

.form-group { display: flex; flex-direction: column; gap: 7px; }
.form-group label { font-size: 15px; font-weight: 500; color: var(--muted); }
.label-optional { font-weight: 400; color: var(--border); }

.form-input {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  color: var(--text);
  font-size: 16px;
  font-family: inherit;
  transition: border-color 0.12s;
  width: 100%;
}
.form-input:focus { outline: none; border-color: var(--primary); }
textarea.form-input { resize: vertical; min-height: 140px; }
select.form-input { cursor: pointer; }
input[type="file"].form-input { padding: 8px 12px; cursor: pointer; }

.form-actions {
  display: flex;
  gap: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.file-manage-list { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.file-manage-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 9px 0;
  font-size: 15px;
  border-bottom: 1px solid var(--border);
}
.file-manage-item:last-child { border-bottom: none; }

/* ── Instance / Docker section ────────────────── */
.instance-section {
  margin-bottom: 28px;
}

.instance-box {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.instance-running {
  flex-direction: column;
  align-items: stretch;
  gap: 24px;
  padding: 28px 32px;
  border-color: color-mix(in srgb, #3fb950 40%, transparent);
  background: color-mix(in srgb, #3fb950 6%, transparent);
}

.instance-idle {
  background: var(--surface);
}

.instance-building {
  background: color-mix(in srgb, var(--reverse) 6%, transparent);
  border-color: color-mix(in srgb, var(--reverse) 40%, transparent);
}

.instance-error {
  background: color-mix(in srgb, var(--danger) 6%, transparent);
  border-color: color-mix(in srgb, var(--danger) 40%, transparent);
}

.instance-transition {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 28px 32px;
  border: 1px solid color-mix(in srgb, var(--primary) 44%, transparent);
  border-radius: 12px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary) 10%, transparent), transparent 60%),
    var(--surface);
  box-shadow: 0 18px 42px rgba(238, 114, 241, 0.10);
}

.instance-transition[hidden] {
  display: none;
}

.instance-transition-head {
  display: flex;
  align-items: center;
  gap: 16px;
}

.instance-status-dot-loading {
  background: var(--primary);
  box-shadow: 0 0 14px var(--primary-glow);
  animation: pulse 1.2s ease-in-out infinite;
}

.instance-progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.instance-progress-label {
  color: #ffd9f9;
  font-size: 0.9em;
  letter-spacing: 0.02em;
}

.instance-progress {
  position: relative;
  height: 16px;
  border-radius: 999px;
  overflow: hidden;
  background: color-mix(in srgb, var(--primary) 10%, var(--surface2));
  border: 1px solid color-mix(in srgb, var(--primary) 22%, transparent);
  box-shadow:
    inset 0 1px 0 rgba(255,255,255,0.06),
    inset 0 -10px 22px rgba(0,0,0,0.28);
}

.instance-progress::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.26), transparent);
  transform: translateX(-100%);
  animation: instance-progress-sheen 1.6s linear infinite;
}

.instance-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary2), var(--primary), #f9a8d4);
  box-shadow: 0 0 24px rgba(238, 114, 241, 0.34);
  transition: width 0.45s ease;
  position: relative;
}

.instance-progress-bar::after {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: inherit;
  background: linear-gradient(180deg, rgba(255,255,255,0.32), transparent 60%);
  pointer-events: none;
}

.instance-transition-copy {
  color: var(--muted);
}

.instance-transition-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.instance-transition-step {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface2) 90%, transparent);
  color: var(--muted);
  font-size: 0.88em;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.instance-transition-step.is-active {
  color: var(--text);
  border-color: color-mix(in srgb, var(--primary) 40%, transparent);
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  transform: translateY(-1px);
}

.instance-transition-step.is-complete {
  color: #ffd9f9;
  border-color: color-mix(in srgb, var(--primary) 28%, transparent);
  background: color-mix(in srgb, var(--primary) 18%, transparent);
}

@keyframes instance-progress-sheen {
  to { transform: translateX(100%); }
}

/* Running instance — stacked layout */
.instance-running-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.instance-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1em;
}

.instance-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #3fb950;
  flex-shrink: 0;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.4; }
}

.instance-timer {
  color: var(--muted);
}

.instance-running-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.instance-extra-port {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}
.instance-extra-port-label {
  font-size: 0.8em;
  color: var(--muted);
  font-family: monospace;
  min-width: 60px;
}

.instance-connect-label {
  color: var(--muted);
  margin: 0;
}

.instance-host {
  color: #d4d4d8;
  font-family: monospace;
  font-size: 1em;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 10px 14px;
  display: inline-block;
  cursor: pointer;
  text-align: left;
}

.instance-host:hover {
  color: var(--text);
}

.instance-host:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--primary) 75%, white);
  outline-offset: 2px;
}

.instance-breach {
  padding: 14px 0;
  border-top: 1px solid color-mix(in srgb, #3fb950 25%, transparent);
}

.instance-breach-label {
  color: var(--muted);
  margin: 0 0 8px 0;
}

.instance-breach-key {
  color: var(--muted);
  user-select: none;
}

.instance-breach-value {
  user-select: all;
}

.instance-breach-creds {
  font-family: monospace;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  margin: 0;
  color: var(--fg);
}

.instance-running-footer {
  padding-top: 20px;
  border-top: 1px solid color-mix(in srgb, #3fb950 25%, transparent);
}

.instance-idle-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.instance-idle-text span {
  color: var(--muted);
}

@media (max-width: 760px) {
  .instance-transition {
    padding: 22px 20px;
  }

  .instance-transition-head,
  .instance-running-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .instance-transition-steps {
    grid-template-columns: 1fr;
  }
}

/* ── Image status badges ───────────────────────── */
.image-status {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.image-status-none     { background: color-mix(in srgb, var(--muted)    18%, transparent); color: var(--muted);    border: 1px solid color-mix(in srgb, var(--muted)    35%, transparent); }
.image-status-building { background: color-mix(in srgb, var(--reverse)  18%, transparent); color: var(--reverse);  border: 1px solid color-mix(in srgb, var(--reverse)  35%, transparent); }
.image-status-ready    { background: color-mix(in srgb, #3fb950          18%, transparent); color: #3fb950;         border: 1px solid color-mix(in srgb, #3fb950          35%, transparent); }
.image-status-error    { background: color-mix(in srgb, var(--danger)   18%, transparent); color: var(--danger);   border: 1px solid color-mix(in srgb, var(--danger)   35%, transparent); }

.image-tag {
  font-family: monospace;
  font-size: 13px;
  color: var(--muted);
  margin-left: 8px;
}

/* ── Build error log ───────────────────────────── */
.build-error {
  margin-top: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  font-family: monospace;
  font-size: 12px;
  color: var(--danger);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 200px;
  overflow-y: auto;
}

/* ── Form extras ───────────────────────────────── */
.form-section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.form-hint {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ── Error pages ───────────────────────────────── */
.error-page {
  text-align: center;
  padding: 80px 24px;
}
.error-page h1 { font-size: 80px; font-weight: 700; color: var(--muted); margin-bottom: 16px; }
.error-page p  { color: var(--muted); font-size: 18px; margin-bottom: 28px; }

/* ── Active instance section (challenge list) ──── */
.active-instance-section { margin: 16px 0 40px !important; padding: 13px 0 !important; }

.active-instance-heading-label {
  font-size: 20px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text);
}

/* ── Running indicator on challenge cards ──────── */
.challenge-running-line {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: #3fb950;
  white-space: nowrap;
  transform: translateY(1px);
}

.running-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3fb950;
  flex-shrink: 0;
  animation: pulse 2s ease-in-out infinite;
}

/* ── Active challenge card ─────────────────────── */
.challenge-card-active {
  border-color: color-mix(in srgb, #3fb950 50%, transparent);
}
.challenge-card-active:hover {
  border-color: #3fb950;
}

.challenge-slug-label {
  display: block;
  font-size: 0.75em;
  color: var(--muted);
  font-family: monospace;
  margin-top: 2px;
}

.challenge-card-badges {
  display: flex;
  align-items: center;
  gap: 6px;
}
.challenge-card-solved {
  /* background: linear-gradient(135deg, rgba(63, 185, 80, 0.07) 0%, var(--surface) 60%); */
  position: relative;
  overflow: hidden;
}
.challenge-card-solved::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, #3fb950, #2ea043);
}
.challenge-card-solved::before {
  content: '✓';
  position: absolute;
  bottom: 20px;
  right: 35px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3fb950, #2ea043);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  box-shadow: 0 2px 6px rgba(63, 185, 80, 0.4);
  z-index: 1;
}
.challenge-card-solved:hover {
  border-color: rgba(63, 185, 80, 0.7);
  background: var(--surface2);
}
.challenge-card-solved .challenge-title {
  color: var(--muted);
}

/* ── Flag submission section ───────────────────── */
.flag-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px 32px;
  margin-top: 24px;
}
.flag-section-title {
  font-size: 1em;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}
.flag-form {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 12px;
}
.flag-input {
  flex: 1;
  font-family: monospace;
  letter-spacing: 0.02em;
}
.flag-solved {
  border-color: rgba(63, 185, 80, 0.4);
  background: rgba(63, 185, 80, 0.05);
  display: flex;
  align-items: center;
  gap: 16px;
}
.flag-solved-icon {
  font-size: 1.5em;
  color: #3fb950;
  font-weight: 700;
  flex-shrink: 0;
}
.flag-solved strong {
  display: block;
  color: #3fb950;
  font-size: 1em;
}
.flag-solved-time {
  color: var(--muted);
  display: block;
  margin-top: 2px;
}

/* ── Skill pills (challenge cards & detail) ─────── */
.challenge-skills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
  min-height: 34px;
  align-content: flex-start;
  padding-top: 10px;
}

.challenge-skills-detail {
  gap: 12px;
  padding-top: 4px;
}

.skills-label {
  font-size: 12px;
  color: var(--muted);
  margin-right: 4px;
}

.skill-pill {
  font-size: 12px;
  padding: 2px 9px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  color: var(--primary);
  border: 1px solid color-mix(in srgb, var(--primary) 30%, transparent);
  font-weight: 500;
  white-space: nowrap;
}

.skill-pill-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary) 16%, transparent), transparent 80%),
    color-mix(in srgb, var(--primary) 8%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--primary) 36%, transparent);
  color: #ffd9f9;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  box-shadow: 0 10px 24px rgba(238, 114, 241, 0.08);
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease, background 0.16s ease, color 0.16s ease;
}

.skill-pill-link:hover {
  color: #fff1fd;
  text-decoration: none;
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--primary) 58%, transparent);
  box-shadow: 0 14px 30px rgba(238, 114, 241, 0.14);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--primary) 24%, transparent), transparent 78%),
    color-mix(in srgb, var(--primary) 12%, var(--surface));
}

.skill-pill-link:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--primary) 75%, white);
  outline-offset: 2px;
  text-decoration: none;
}

.skill-pill-label {
  white-space: normal;
  line-height: 1.3;
}

.skill-pill-arrow {
  font-size: 15px;
  opacity: 0.8;
  flex-shrink: 0;
}

.skill-pill-hint {
  color: var(--muted);
  font-style: italic;
}

.skill-pill-locked {
  font-size: 12px;
  padding: 4px 18px;
  border-radius: 2px;
  font-weight: 500;
  white-space: nowrap;
  border: 1px solid color-mix(in srgb, var(--muted) 25%, transparent);
  background: color-mix(in srgb, var(--muted) 10%, transparent);
  color: var(--muted);
}

/* ── Skills page ────────────────────────────────── */
.skills-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.skill-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px 20px;
  min-height: 138px;
  transition: border-color 0.12s, background 0.12s;
}
.skill-entry:hover {
  border-color: var(--primary);
  background: var(--surface2);
}

.skill-entry-locked {
  opacity: 0.75;
  border-style: dashed;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--muted) 10%, transparent), color-mix(in srgb, var(--muted) 4%, transparent));
}

.skill-entry-header-locked {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  min-height: 100px;
}

.skill-entry-unknown-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 8px;
  border: 1px solid color-mix(in srgb, var(--muted) 35%, transparent);
  background: color-mix(in srgb, var(--muted) 8%, transparent);
  color: var(--muted);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
}

.skill-entry-name {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.skill-entry-name:hover {
  color: var(--primary);
  text-decoration: none;
}
.skill-entry-name:hover .skill-entry-arrow {
  transform: translateX(3px);
}

.skill-entry-arrow {
  font-size: 18px;
  color: var(--muted);
  line-height: 1;
  transition: transform 0.15s;
}

.skill-name-unknown {
  color: var(--muted);
  font-style: italic;
  font-weight: 400;
}

.skill-entry-challenges {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 14px;
}

.skill-challenge-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.1s;
}
.skill-challenge-row:hover {
  background: var(--surface2);
  text-decoration: none;
}


.skill-challenge-row-locked {
  color: var(--muted);
  cursor: default;
}
.skill-challenge-row-locked:hover {
  background: none;
}

.skill-challenge-unknown {
  font-style: italic;
  color: var(--muted);
}


/* ── Empty state ───────────────────────────────── */
.empty-state { text-align: center; padding: 64px 24px; color: var(--muted); }

/* ── Admin sub-nav ─────────────────────────────── */
.admin-subnav {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}
.admin-subnav-link {
  padding: 10px 20px;
  font-size: 0.875em;
  font-weight: 500;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  text-decoration: none;
  transition: color 0.15s, border-color 0.15s;
}
.admin-subnav-link:hover { color: var(--text); text-decoration: none; }
.admin-subnav-link.active { color: var(--primary); border-bottom-color: var(--primary); text-shadow: 0 0 10px var(--primary-glow); }

/* ── Resource cards ────────────────────────────── */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 8px;
}
.resource-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
}
.resource-card-label {
  font-size: 0.75em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
  margin-bottom: 6px;
}
.resource-card-value {
  font-size: 1.5em;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.resource-card-sub {
  font-size: 0.75em;
  color: var(--muted);
  margin-top: 6px;
}
.resource-bar {
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}
.resource-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.3s ease;
}
.resource-bar-cpu  { background: var(--primary); }
.resource-bar-mem  { background: #3fb950; }

/* ── Instance table extras ─────────────────────── */
.instance-user {
  font-size: 0.8em;
  color: var(--muted);
  font-family: monospace;
  max-width: 180px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 5px;
}
.status-dot-running { background: #3fb950; }
.status-dot-stopped { background: var(--muted); }
.text-danger { color: var(--danger); }

/* ── VPN / WireGuard section (profile page) ────── */
.vpn-section-title {
  font-size: 20px;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 16px;
}

.vpn-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.vpn-intro {
  padding: 18px 24px;
  font-size: 18px;
  line-height: 1.6;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.vpn-status-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
}

.vpn-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.vpn-dot-connected    { background: #3fb950; animation: pulse 2s ease-in-out infinite; }
.vpn-dot-disconnected { background: var(--muted); }
.vpn-dot-none         { background: var(--border); }

.vpn-status-text { font-size: 15px; font-weight: 500; }
.vpn-connected   { color: #3fb950; }

.vpn-ip {
  font-family: monospace;
  font-size: 14px;
  color: var(--muted);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  margin-left: auto;
}

.vpn-config-section {
  padding: 20px 24px;
}
.vpn-config-label {
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
  margin-bottom: 10px;
}
.vpn-config-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px 18px;
  font-family: monospace;
  font-size: 18px;
  color: var(--text);
  white-space: pre;
  overflow-x: auto;
  line-height: 1.7;
}
.vpn-config-heading { color: var(--primary); font-weight: 600; }
.vpn-config-masked { color: var(--muted); letter-spacing: 1px; }

.vpn-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
}
.vpn-actions form { margin: 0; }
.vpn-actions-spread { justify-content: space-between; }
.vpn-actions-left { display: flex; align-items: center; gap: 12px; }
.vpn-actions-form { display: flex; align-items: center; justify-content: space-between; width: 100%; gap: 12px; }

.vpn-worker-select {
  display: flex;
  align-items: center;
  gap: 8px;
}
.vpn-worker-select-label {
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
}
.vpn-worker-select-input {
  width: auto;
  display: inline-block;
  font-size: 13px;
}

.vpn-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 20px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  text-decoration: none;
  display: inline-block;
}
.vpn-btn:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 0 16px var(--primary-glow);
}

.vpn-docs {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.vpn-docs-title {
  font-size: 16px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
}

.vpn-docs-step { display: flex; flex-direction: column; gap: 6px; }

.vpn-docs-step-label {
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
}

.vpn-code {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 14px;
  font-family: monospace;
  font-size: 14px;
  color: var(--text);
  white-space: pre;
  overflow-x: auto;
  line-height: 1.7;
}

.vpn-code-sample { color: var(--muted); font-size: 13px; }
.vpn-docs-hint {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
  padding-left: 5px;
}
.vpn-docs-hint code {
  font-family: monospace;
  font-size: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
}

.vpn-docs-note {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
  padding-top: 4px;
  border-top: 1px solid var(--border);
}
.vpn-docs-note code {
  font-family: monospace;
  font-size: 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
}

/* ── Skill entry header (name + learn button) ─────────────────────────────── */
.skill-entry-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.skill-entry-header.skill-entry-header-locked {
  justify-content: center;
}

/* ── Skill detail page ────────────────────────────────────────────────────── */
.skill-detail-layout {
  display: block;
}

.challenge-detail-layout {
  display: block;
}

.skill-detail-sidebar-title {
  font-size: 33px;
  line-height: 1.08;
  font-weight: 700;
  color: var(--text);
  margin: 0;
  text-wrap: balance;
}

.skill-detail-sidebar-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.challenge-detail-sidebar-info {
  gap: 16px;
}

.skill-detail-main {
  width: 100%;
  min-width: 0;
}

.challenge-detail-main {
  width: 100%;
  min-width: 0;
}

.skill-detail-body {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 36px 40px;
  margin-bottom: 24px;
}

.skill-detail-body-first {
  border-radius: 12px 12px 0 0;
  margin-bottom: 0;
  border-bottom: none;
}

.skill-detail-body-last {
  border-radius: 0 0 12px 12px;
}

.skill-detail-section-title {
  font-size: 17px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.skill-detail-empty {
  color: var(--muted);
  font-style: italic;
}

.skill-sidenav-meta {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.skill-detail-sidenav .sidenav-filter-group,
.challenge-detail-sidenav .sidenav-filter-group {
  gap: 12px;
}

.skill-detail-sidenav .back-link,
.challenge-detail-sidenav .back-link {
  margin-bottom: 4px;
}

.detail-sidebar-row {
  display: block;
}

.detail-sidebar-row-value {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 0;
  min-height: 0;
  border: none;
  border-radius: 0;
  background: none;
  box-shadow: none;
}

.skill-detail-sidenav .detail-sidebar-row-value .sidenav-icon,
.challenge-detail-sidenav .detail-sidebar-row-value .sidenav-icon {
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface2) 78%, transparent);
  flex-shrink: 0;
}

.detail-sidebar-category-name {
  font-size: 22px;
  line-height: 1.2;
  font-weight: 700;
  text-transform: capitalize;
}

.detail-sidebar-category-machine { color: var(--machine); }
.detail-sidebar-category-web { color: var(--web); }
.detail-sidebar-category-cve { color: var(--cve); }
.detail-sidebar-category-crypto { color: var(--crypto); }
.detail-sidebar-category-pwn { color: var(--pwn); }
.detail-sidebar-category-reverse { color: var(--reverse); }
.detail-sidebar-category-mobile { color: var(--mobile); }
.detail-sidebar-category-linux { color: var(--linux); }
.detail-sidebar-category-windows { color: var(--windows); }
.detail-sidebar-category-active-directory { color: var(--active-directory); }
.detail-sidebar-category-network { color: var(--network); }
.detail-sidebar-category-misc { color: var(--misc); }

.skill-sidenav-list,
.challenge-sidenav-list {
  gap: 4px;
}

.skill-sidenav-labs {
  margin-top: 14px;
  width: 100%;
}

.skill-sidenav-labs .sidenav-filter-heading {
  display: block;
  margin-bottom: 8px;
}

.skill-sidenav-lab-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.skill-sidenav-link,
.challenge-sidenav-link {
  position: relative;
  align-items: flex-start;
  padding-block: 12px;
}

.skill-sidenav-link .sidenav-name,
.challenge-sidenav-link .sidenav-name {
  white-space: normal;
  line-height: 1.25;
}

.skill-sidenav-link.active,
.challenge-sidenav-link.active {
  background: color-mix(in srgb, var(--primary) 14%, transparent);
  color: var(--text);
  box-shadow: inset 3px 0 0 var(--primary);
}

.skill-sidenav-link.active .sidenav-name,
.challenge-sidenav-link.active .sidenav-name {
  color: var(--text);
}

.skill-sidenav-link[data-section],
.challenge-sidenav-link[data-section] {
  padding-left: 28px;
  font-size: 18px;
}

.skill-sidenav-link[data-section]::before,
.challenge-sidenav-link[data-section]::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--muted) 65%, transparent);
  transform: translateY(-50%);
}

.challenge-detail-sidebar-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.challenge-detail-sidebar-row {
  gap: 8px;
}

.challenge-detail-sidebar-row .sidenav-filter-heading {
  display: block;
  margin-bottom: 8px;
}

.challenge-detail-sidebar-row .detail-sidebar-row-value {
  align-items: flex-start;
}

.challenge-detail-sidebar-skills {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.challenge-detail-skill-pill {
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text);
  background: color-mix(in srgb, var(--surface2) 92%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 92%, transparent);
  border-radius: 12px;
  box-shadow: none;
  letter-spacing: 0;
}

.challenge-detail-skill-pill:hover {
  transform: none;
  color: var(--text);
  background: color-mix(in srgb, var(--surface2) 72%, var(--surface));
  border-color: color-mix(in srgb, var(--primary) 28%, var(--border));
  box-shadow: none;
}

.challenge-detail-skill-pill .skill-pill-label {
  font-weight: 600;
}

.challenge-detail-skill-pill .skill-pill-arrow {
  font-size: 13px;
  opacity: 0.55;
}

.challenge-detail-skill-hint {
  font-size: 14px;
  line-height: 1.4;
}

.challenge-detail-diff-slider {
  width: 100%;
  padding: 4px 0 0;
}

.challenge-detail-diff-slider .diff-slider-input {
  pointer-events: none;
  cursor: default;
}

.challenge-detail-diff-slider .diff-slider-input::-webkit-slider-thumb:hover {
  transform: none;
}

.challenge-detail-diff-slider .diff-slider-label {
  cursor: default;
}

.challenge-detail-sidenav .detail-sidebar-url {
  font-family: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  color: var(--primary);
  word-break: break-all;
}

.challenge-detail-sidenav .detail-sidebar-files {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.challenge-detail-sidenav .detail-sidebar-file {
  font-size: 14px;
  color: var(--primary);
}

.skill-sidenav-lab-link {
  gap: 10px;
  padding-left: 14px;
  font-size: 17px;
}

.skill-sidenav-lab-link::before {
  display: none;
}

.skill-sidenav-lab-status {
  width: 18px;
  height: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  flex-shrink: 0;
}

.skill-sidenav-lab-status-solved {
  color: #3fb950;
  background: color-mix(in srgb, #3fb950 18%, transparent);
  border: 1px solid color-mix(in srgb, #3fb950 32%, transparent);
}

.skill-sidenav-lab-status-unknown {
  color: var(--muted);
  background: color-mix(in srgb, var(--surface2) 88%, transparent);
  border: 1px solid color-mix(in srgb, var(--border) 88%, transparent);
}

.skill-sidenav-lab-link-unknown {
  opacity: 0.68;
  cursor: default;
}

/* ── Skill detail content (rich HTML) ────────────────────────────────────── */
.skill-detail-content p {
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 20px;
  font-size: 19px;
}

.skill-detail-content h3 {
  font-size: 17px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  margin: 36px 0 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.skill-detail-content h3:first-child {
  margin-top: 0;
}

.skill-detail-content ul {
  padding-left: 22px;
  margin-bottom: 20px;
}

.skill-detail-content li {
  color: var(--text);
  line-height: 1.8;
  font-size: 19px;
  margin-bottom: 8px;
}

/* Inline code */
.skill-detail-content code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.85em;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 7px;
  color: #e06c75;
}

/* Code blocks */
.skill-detail-content pre {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 8px 0 28px;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 16px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  user-select: none;
}

.code-block-lang {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 12px;
  color: var(--muted);
  text-transform: lowercase;
  letter-spacing: 0.3px;
}

.skill-detail-content pre code {
  display: block;
  background: none;
  border: none;
  padding: 20px 24px;
  color: var(--text);
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 14px;
  line-height: 1.7;
  overflow-x: auto;
}

/* Copy button */
.code-copy-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  font-size: 12px;
  font-family: inherit;
  line-height: 1;
  background: none;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  user-select: none;
}
.code-copy-btn:hover { color: var(--text); border-color: var(--text); }
.code-copy-btn.copied { color: #3fb950; border-color: #3fb950; }

@media (min-width: 1400px) {
  .skill-detail-sidenav,
  .challenge-detail-sidenav {
    width: 430px;
  }

  .skill-detail-main,
  .challenge-detail-main {
    margin-left: 50px;
    max-width: min(1240px, calc(100vw - 430px));
  }
}

@media (max-width: 1399px) {
  .skill-detail-sidenav,
  .challenge-detail-sidenav {
    display: none;
  }
}

/* ── Skill detail labs list ───────────────────────────────────────────────── */
.skill-labs-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skill-lab-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: 8px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  background: var(--surface2);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, background 0.15s;
}

.skill-lab-row-solved {
  border-left-color: #3fb950;
}
.skill-lab-row-solved:hover {
  background: var(--surface);
  border-color: #3fb950;
  border-left-color: #3fb950;
  text-decoration: none;
}

.skill-lab-row-unknown {
  border-left-color: var(--border);
  cursor: default;
  opacity: 0.6;
}

.skill-lab-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  flex-shrink: 0;
}

.skill-lab-icon-solved {
  background: rgba(63, 185, 80, 0.15);
  color: #3fb950;
  border: 1px solid rgba(63, 185, 80, 0.3);
}

.skill-lab-icon-unknown {
  background: var(--surface);
  color: var(--muted);
  border: 1px solid var(--border);
}

.skill-lab-title {
  flex: 1;
  font-size: 15px;
  font-weight: 500;
}

.skill-lab-title-unknown {
  color: var(--muted);
  font-style: italic;
  font-weight: 400;
}

.skill-lab-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.skill-lab-title {
  font-weight: 500;
  flex: 1;
}