/* ===== CSS Variables & Themes ===== */
:root {
  --bg: #0a0a0a;
  --bg-2: #111111;
  --bg-card: #141414;
  --bg-card-hover: #1a1a1a;
  --border: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(255, 255, 255, 0.12);
  --text: #e8e8e8;
  --text-muted: #888888;
  --text-dim: #555555;
  --font: 'Inter', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --radius: 4px;
  --radius-lg: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --theme-transition: 0s;

  /* accent vars set dynamically by theme-engine.js */
  --accent: #00ff88;
  --accent-dim: #00cc6a;
  --accent-glow: rgba(0, 255, 136, 0.15);
  --accent-glow-strong: rgba(0, 255, 136, 0.35);
  --accent-subtle: rgba(0, 255, 136, 0.08);
  --aurora-1: rgba(0, 255, 136, 0.12);
  --aurora-2: rgba(0, 255, 136, 0.06);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Theme colors update instantly — smoothness handled by theme-engine.js */
body.theme-flow *,
body.theme-flow *::before,
body.theme-flow *::after {
  transition-property: transform, opacity, width, height, filter !important;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }

/* ===== Custom checkboxes ===== */
input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  box-sizing: border-box;
  width: 18px;
  height: 18px;
  min-width: 18px;
  min-height: 18px;
  flex: 0 0 18px;
  margin: 0;
  border: 1.5px solid var(--border-accent);
  border-radius: 5px;
  background: var(--bg-card);
  cursor: pointer;
  position: relative;
  vertical-align: middle;
  transition: border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}

input[type="checkbox"]::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 1px;
  width: 5px;
  height: 10px;
  border: solid transparent;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) scale(0);
  transition: transform 0.15s cubic-bezier(0.34, 1.4, 0.64, 1);
  pointer-events: none;
}

input[type="checkbox"]:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border-accent));
  background: var(--accent-subtle);
}

input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent),
              0 0 14px var(--accent-glow);
}

input[type="checkbox"]:checked::after {
  border-color: var(--bg);
  transform: rotate(45deg) scale(1);
}

input[type="checkbox"]:active:not(:disabled) {
  transform: scale(0.92);
}

input[type="checkbox"]:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="checkbox"]:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.checkbox-label,
.admin-check,
.builder-publish,
.modal-form .checkbox-label,
.notes-add-actions .checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.3;
}

.checkbox-label:hover,
.admin-check:hover,
.builder-publish:hover,
.modal-form .checkbox-label:hover,
.notes-add-actions .checkbox-label:hover {
  color: var(--text);
}

.checkbox-label input[type="checkbox"],
.admin-check input[type="checkbox"],
.builder-publish input[type="checkbox"],
.modal-form .checkbox-label input[type="checkbox"],
.notes-add-actions .checkbox-label input[type="checkbox"] {
  flex-shrink: 0;
}

.admin-table input[type="checkbox"],
.storage-asset-cb,
#storage-select-all {
  display: inline-block;
  margin: 0 auto;
  vertical-align: middle;
}

/* ===== Number inputs (no native spinners) ===== */
input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
  font-variant-numeric: tabular-nums;
}

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"]:focus {
  outline: none;
}

.admin-inp[type="number"]:focus,
.modal-form input[type="number"]:focus,
.contact-form input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* Stepped wrapper — optional; keeps layout stable in form rows */
.num-stepper {
  position: relative;
  display: flex;
  align-items: stretch;
  min-width: 0;
}

.num-stepper > input[type="number"] {
  flex: 1;
  min-width: 0;
  width: 100%;
  padding-right: 2.1rem;
}

.num-stepper__controls {
  position: absolute;
  top: 1px;
  right: 1px;
  bottom: 1px;
  display: flex;
  flex-direction: column;
  width: 1.65rem;
  border-left: 1px solid var(--border);
  border-radius: 0 calc(var(--radius) - 1px) calc(var(--radius) - 1px) 0;
  overflow: hidden;
  pointer-events: none;
}

.num-stepper__btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  padding: 0;
  border: none;
  background: color-mix(in srgb, var(--bg-card) 88%, transparent);
  color: var(--text-muted);
  cursor: pointer;
  pointer-events: auto;
  transition: background 0.15s ease, color 0.15s ease;
}

.num-stepper__btn + .num-stepper__btn {
  border-top: 1px solid var(--border);
}

.num-stepper__btn:hover {
  background: var(--accent-subtle);
  color: var(--accent);
}

.num-stepper__btn:active {
  background: color-mix(in srgb, var(--accent) 22%, var(--bg-card));
}

.num-stepper__btn:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--accent-glow);
  z-index: 1;
}

.num-stepper__btn::before {
  content: '';
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
}

.num-stepper__btn--up::before {
  border-bottom: 5px solid currentColor;
  margin-top: 1px;
}

.num-stepper__btn--down::before {
  border-top: 5px solid currentColor;
  margin-bottom: 1px;
}

.num-stepper--compact > input[type="number"] {
  padding-right: 1.85rem;
}

.num-stepper--compact .num-stepper__controls {
  width: 1.45rem;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.accent { color: var(--accent); }

/* ===== Background Effects ===== */
.noise {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black 20%, transparent 70%);
}

.aurora {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.aurora::before,
.aurora::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: auroraDrift 12s ease-in-out infinite alternate;
}

.aurora::before {
  width: 60vw;
  height: 60vw;
  top: -20%;
  left: -10%;
  background: radial-gradient(circle, var(--aurora-1), transparent 70%);
}

.aurora::after {
  width: 50vw;
  height: 50vw;
  bottom: -15%;
  right: -10%;
  background: radial-gradient(circle, var(--aurora-2), transparent 70%);
  animation-delay: -6s;
  animation-direction: alternate-reverse;
}

@keyframes auroraDrift {
  0%   { transform: translate(0, 0) scale(1); }
  33%  { transform: translate(5%, 8%) scale(1.1); }
  66%  { transform: translate(-4%, 4%) scale(0.95); }
  100% { transform: translate(3%, -5%) scale(1.05); }
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10001;
  min-height: 72px;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 72px;
  min-width: 0;
}

.nav--app {
  gap: 12px;
}

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

.logo-icon {
  width: 32px;
  height: 32px;
}

.ico-face {
  fill: none;
  stroke: var(--accent);
  stroke-width: 0.8;
  opacity: 0.6;
}

.ico-edge {
  stroke: var(--accent);
  stroke-width: 0.6;
  opacity: 0.4;
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.logo-text em {
  color: var(--accent);
  font-style: normal;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition);
}

.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { width: 100%; }

.app-nav-links {
  gap: 4px;
  flex-wrap: nowrap;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

.app-nav-links::-webkit-scrollbar {
  display: none;
}

.app-nav-links li {
  flex-shrink: 0;
}

.app-nav-links .app-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 11px;
  font-size: 0.82rem;
  white-space: nowrap;
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.app-nav-links .app-nav-link::after {
  display: none;
}

.app-nav-links .app-nav-link:hover,
.app-nav-links .app-nav-link.active {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background: var(--accent-subtle);
}

.nav--app .nav-links {
  flex: 1 1 auto;
  min-width: 0;
  justify-content: center;
}

.nav--app .logo {
  flex-shrink: 0;
}

@media (max-width: 1200px) {
  .nav--app .logo-text {
    display: none;
  }

  .app-nav-links .app-nav-link {
    padding: 8px 9px;
    font-size: 0.8rem;
  }
}

@media (max-width: 1280px) {
  .nav--app .nav-actions {
    gap: 8px;
  }

  .nav--app .auth-nav {
    gap: 6px;
  }

  .nav--app .nav-admin-link,
  .nav--app .nav-logout-btn {
    min-width: 0;
    padding-left: 10px;
    padding-right: 10px;
  }

  .nav--app .nav-user {
    min-width: 0;
    max-width: 9rem;
    padding: 5px 10px !important;
  }
}

@media (max-width: 1100px) {
  .nav--app .nav-links {
    display: none;
  }

  .nav--app .burger {
    display: flex;
  }
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  min-width: 0;
}

.auth-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  flex-shrink: 0;
}

.nav-extra-slot {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  min-width: 0;
}

.nav-admin-slot {
  flex-shrink: 0;
  width: 0;
  min-width: 0;
  overflow: hidden;
}

.nav-admin-link {
  flex-shrink: 0;
  min-width: 4.75rem;
}

.nav-logout-slot,
.nav-logout-btn {
  flex-shrink: 0;
  min-width: 4.75rem;
}

.nav-enroll-slot {
  flex-shrink: 0;
  min-width: 6.5rem;
}

.nav-slot-hidden {
  visibility: hidden;
  pointer-events: none;
}

.nav-user {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 1px;
  line-height: 1.2;
  padding: 5px 12px !important;
  min-width: 5.5rem;
  max-width: 11rem;
  flex-shrink: 0;
  white-space: normal;
}

.nav-handle {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text);
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-pts {
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.nav-pts-val {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.75rem;
}

.nav-login-btn {
  min-width: 4.75rem;
}

.hide-mobile {}

.theme-switcher {
  display: flex;
  gap: 5px;
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 20px;
  flex-wrap: wrap;
  max-width: 200px;
}

.theme-btn {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  transition: transform var(--transition);
  flex-shrink: 0;
}

.theme-btn[data-theme="auto"] {
  background: conic-gradient(#00ff88, #4da6ff, #b44dff, #ff44aa, #ff3344, #ffaa00, #00ff88);
  animation: spinHue 4s linear infinite;
}

@keyframes spinHue {
  to { filter: hue-rotate(360deg); }
}

.theme-btn[data-theme="green"]  { background: #00ff88; }
.theme-btn[data-theme="blue"]   { background: #4da6ff; }
.theme-btn[data-theme="cyan"]   { background: #00e5ff; }
.theme-btn[data-theme="purple"] { background: #b44dff; }
.theme-btn[data-theme="pink"]   { background: #ff44aa; }
.theme-btn[data-theme="red"]    { background: #ff3344; }
.theme-btn[data-theme="amber"]  { background: #ffaa00; }
.theme-btn[data-theme="lime"]   { background: #aaff00; }

.theme-btn.active {
  transform: scale(1.2);
  box-shadow: 0 0 10px currentColor, 0 0 4px var(--accent);
  outline: 2px solid rgba(255,255,255,0.3);
  outline-offset: 2px;
}

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.burger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: transform var(--transition), opacity var(--transition), filter var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--accent);
  color: #0a0a0a;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn--primary:hover {
  box-shadow: 0 0 30px var(--accent-glow-strong);
  transform: translateY(-1px);
}

.btn--outline {
  border: 1px solid var(--border-accent);
  color: var(--text);
}

.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--ghost {
  color: var(--text-muted);
  padding: 12px 20px;
}

.btn--ghost:hover { color: var(--accent); }

.btn--sm { padding: 8px 20px; font-size: 0.8rem; }
.btn--lg { padding: 16px 36px; font-size: 1rem; }
.btn--full { width: 100%; }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: lowercase;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 480px;
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  gap: 40px;
}

.stat-num {
  display: block;
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Hero Visual */
.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.icosahedron-wrap {
  position: relative;
  width: 320px;
  height: 320px;
}

#icosahedron {
  width: 100%;
  height: 100%;
}

.orbit {
  position: absolute;
  border: 1px solid var(--border-accent);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.orbit--1 { width: 280px; height: 280px; animation: spin 20s linear infinite; }
.orbit--2 { width: 340px; height: 340px; animation: spin 30s linear infinite reverse; opacity: 0.5; }
.orbit--3 { width: 400px; height: 400px; animation: spin 40s linear infinite; opacity: 0.3; }

@keyframes spin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.terminal-card {
  width: 100%;
  max-width: 380px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.terminal-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}

.dot { width: 10px; height: 10px; border-radius: 50%; }
.dot--r { background: #ff5f57; }
.dot--y { background: #febc2e; }
.dot--g { background: #28c840; }

.terminal-title {
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.terminal-body {
  padding: 16px;
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.8;
  min-height: 120px;
  color: var(--accent);
}

.terminal-body .prompt { color: var(--text-dim); }
.terminal-body .cmd { color: var(--text); }
.terminal-body .output { color: var(--text-muted); }

.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.6); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* ===== Sections ===== */
.section {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.section-header {
  margin-bottom: 64px;
}

.section-tag {
  display: block;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-text strong { color: var(--text); }

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

.feature-card {
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), opacity var(--transition), filter var(--transition);
}

.feature-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  box-shadow: 0 0 30px var(--accent-glow);
}

.feature-icon {
  width: 36px;
  height: 36px;
  color: var(--accent);
  margin-bottom: 16px;
}

.feature-icon svg { width: 100%; height: 100%; }

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== Programs ===== */
.programs { background: var(--bg-2); }

.track-switch-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 20px;
  gap: 12px;
  width: 100%;
}

.track-switch {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  gap: 8px;
  row-gap: 8px;
  position: relative;
  padding: 8px;
  width: 100%;
  max-width: 960px;
  background: color-mix(in srgb, var(--bg-card) 90%, transparent);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.track-switch-indicator {
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  transition:
    transform 0.38s cubic-bezier(0.34, 1.2, 0.64, 1),
    width 0.38s cubic-bezier(0.34, 1.2, 0.64, 1),
    height 0.38s cubic-bezier(0.34, 1.2, 0.64, 1),
    border-color 0.3s ease,
    box-shadow 0.3s ease,
    background 0.3s ease;
  pointer-events: none;
  z-index: 0;
}

.track-switch-btn {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 1 auto;
  padding: 12px 18px;
  border: none;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 55%, transparent);
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: color 0.25s ease, opacity 0.25s ease, background 0.25s ease;
  white-space: nowrap;
  max-width: 100%;
}

.track-switch-btn:hover {
  color: var(--text);
}

.track-switch-btn.active {
  color: var(--text);
  background: transparent;
}

.track-switch-btn-icon {
  display: inline-flex;
  opacity: 0.8;
  color: var(--dir-accent, var(--accent));
}

.track-switch-btn-label {
  line-height: 1.2;
}

.track-switch-desc {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 0 0 32px;
  min-height: 1.5em;
  max-width: 560px;
  line-height: 1.55;
}

.direction-content-links {
  text-align: center;
}

.direction-content-link {
  font-size: 0.85rem;
  color: var(--accent);
}

.programs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.program-card {
  position: relative;
  padding: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.program-card-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 0%, color-mix(in srgb, var(--prog-accent, var(--accent)) 18%, transparent), transparent 55%);
  pointer-events: none;
  opacity: 0.8;
}

.program-card:hover {
  border-color: color-mix(in srgb, var(--prog-accent, var(--accent)) 50%, var(--border));
  transform: translateY(-6px);
  box-shadow: 0 16px 48px color-mix(in srgb, var(--prog-accent, var(--accent)) 20%, transparent);
}

.program-card--featured {
  border-color: color-mix(in srgb, var(--prog-accent, var(--accent)) 45%, var(--border));
}

.program-card-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.program-meta-badges {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  flex: 1 1 120px;
  min-width: 0;
  max-width: 100%;
}

.program-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: color-mix(in srgb, var(--prog-accent, var(--accent)) 12%, var(--bg));
  border: 1px solid color-mix(in srgb, var(--prog-accent, var(--accent)) 25%, var(--border));
  color: var(--prog-accent, var(--accent));
}

.program-level--easy { color: #00ff88; }
.program-level--mid { color: #ffaa00; }
.program-level--hard { color: #ff3344; }

.program-badge {
  display: inline-block;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  line-height: 1.35;
  padding: 5px 10px;
  background: var(--prog-accent, var(--accent));
  color: #0a0a0a;
  border-radius: 999px;
  white-space: nowrap;
}

.program-level {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  line-height: 1.4;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid currentColor;
  background: color-mix(in srgb, currentColor 8%, transparent);
  white-space: nowrap;
  text-align: center;
}

.program-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.program-card > p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 20px;
}

.program-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}

.program-tags li {
  font-family: var(--mono);
  font-size: 0.65rem;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
}

.program-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
  flex-wrap: wrap;
}

.program-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.program-duration,
.program-bounty {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.program-bounty {
  font-family: var(--mono);
  color: var(--prog-accent, var(--accent));
}

.program-cta {
  flex-shrink: 0;
}

/* ===== Bounty ===== */
.bounty-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.bounty-desc {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin: 20px 0 40px;
}

.bounty-tiers { display: flex; flex-direction: column; gap: 16px; }

.tier {
  display: grid;
  grid-template-columns: 140px 1fr 120px;
  align-items: center;
  gap: 16px;
}

.tier-rank {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.tier--active .tier-rank { color: var(--accent); }

.tier-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.tier-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 8px var(--accent-glow-strong);
}

.tier-pts {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  text-align: right;
}

.leaderboard {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.leaderboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.live-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
}

.leaderboard-list li {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  transition: background var(--transition);
}

.leaderboard-list li:hover { background: var(--accent-subtle); }
.leaderboard-list li:last-child { border-bottom: none; }

.leaderboard-list .rank {
  font-family: var(--mono);
  color: var(--text-dim);
  font-size: 0.75rem;
}

.leaderboard-list .name {
  font-family: var(--mono);
  color: var(--text);
}

.leaderboard-list .pts {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.8rem;
}

.leaderboard-list li:first-child .rank { color: var(--accent); }

.leaderboard-empty {
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-bottom: none !important;
  cursor: default;
}

.leaderboard-empty:hover { background: transparent; }

/* ===== CTA Banner ===== */
.cta-banner { padding: 80px 0; }

.cta-inner {
  text-align: center;
  padding: 60px;
  background: linear-gradient(135deg, var(--accent-subtle), transparent);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}

.cta-inner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, var(--accent-glow), transparent 70%);
  pointer-events: none;
}

.cta-inner h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 12px;
  position: relative;
}

.cta-inner p {
  color: var(--text-muted);
  margin-bottom: 32px;
  position: relative;
}

.cta-inner strong { color: var(--accent); }

/* ===== Contact ===== */
.contact { background: var(--bg-2); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 60px;
}

.contact-list {
  margin: 32px 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-list li {
  display: flex;
  align-items: center;
  gap: 14px;
}

.contact-list svg {
  width: 20px;
  height: 20px;
  color: var(--accent);
  flex-shrink: 0;
}

.contact-list a {
  color: var(--text-muted);
  transition: color var(--transition);
}

.contact-list a:hover { color: var(--accent); }

.qr-block {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 32px;
}

.qr-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 14px 14px 12px;
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
  border-radius: 18px;
  text-decoration: none;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  flex-shrink: 0;
}

.qr-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 65%, var(--border));
  box-shadow: 0 12px 40px color-mix(in srgb, var(--accent) 22%, transparent);
}

.qr-card-glow {
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: radial-gradient(circle at 50% 0%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 65%);
  pointer-events: none;
}

.qr-card-frame {
  position: relative;
  padding: 10px;
  background: #0c0c0c;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.qr-image {
  display: block;
  width: 112px;
  height: 112px;
  border-radius: 8px;
}

.qr-card-dot {
  position: absolute;
  right: 16px;
  bottom: 16px;
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow, var(--accent));
}

.qr-card-domain {
  position: relative;
  z-index: 1;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.qr-copy {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.qr-copy-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.45;
}

.qr-copy-url {
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--text);
  letter-spacing: 0.02em;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

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

.contact-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact-form label span {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--transition);
  outline: none;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.contact-form select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
}

.contact-form textarea { resize: vertical; min-height: 100px; }

.form-note {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-align: center;
}

/* ===== Footer ===== */
.footer {
  position: relative;
  z-index: 1;
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.footer-brand p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--accent); }

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: right;
}

/* ===== Animations on scroll ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Mobile Nav ===== */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 72px 0 0;
  z-index: 10000;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(20px);
  padding: 32px 24px;
  flex-direction: column;
  gap: 24px;
}

.mobile-menu.open { display: flex; }

.mobile-menu a {
  font-size: 1.25rem;
  color: var(--text-muted);
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.mobile-menu a:hover { color: var(--accent); }

.mobile-menu .auth-nav,
.mobile-menu #auth-nav-mobile {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.mobile-menu .auth-nav .btn,
.mobile-menu #auth-nav-mobile .btn {
  width: 100%;
  justify-content: center;
}

.mobile-menu .nav-user {
  align-items: center;
  max-width: none;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-visual { order: -1; }
  .icosahedron-wrap { width: 240px; height: 240px; }
  .about-grid { grid-template-columns: 1fr; }
  .programs-grid { grid-template-columns: 1fr 1fr; }
  .bounty-layout { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .burger { display: flex; }
  .hide-mobile { display: none; }
  .nav-actions { gap: 6px; min-width: 0; }
  .auth-nav { gap: 4px; min-width: 0; }
  .nav-user {
    min-width: 0;
    max-width: 9.5rem;
    padding: 5px 10px !important;
  }
  .nav-login-btn,
  .nav-logout-btn {
    min-width: 0;
    padding-left: 12px;
    padding-right: 12px;
  }
  .conf-header {
    flex-direction: column;
    align-items: stretch;
  }
  .conf-header .btn {
    width: 100%;
    justify-content: center;
  }
  .theme-switcher {
    max-width: 110px;
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .theme-switcher::-webkit-scrollbar { display: none; }
  .hero-stats { gap: 24px; }
  .features-grid { grid-template-columns: 1fr; }
  .programs-grid { grid-template-columns: 1fr; }
  .track-switch-wrap { align-items: stretch; }
  .track-switch {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    border-radius: 16px;
    -webkit-overflow-scrolling: touch;
  }
  .track-switch::-webkit-scrollbar { display: none; }
  .track-switch-btn { padding: 11px 16px; font-size: 0.82rem; }
  .program-meta-badges {
    flex: 1 1 100%;
    justify-content: flex-start;
  }
  .qr-block { flex-direction: column; align-items: flex-start; }
  .tier { grid-template-columns: 1fr; gap: 6px; }
  .tier-pts { text-align: left; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 28px 20px; }
  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .footer-links { justify-content: center; }
  .footer-copy { text-align: center; }
  .cta-inner { padding: 40px 24px; }
  .scroll-hint { display: none; }
}

.theme-switcher { display: none !important; }