/* ============================================
   umjunsik-lang Promotional Site
   Dark theme, modern landing page
   ============================================ */

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

:root {
  --bg: #0a0a0f;
  --bg-surface: #12121a;
  --bg-elevated: #1a1a26;
  --bg-card: #16161f;
  --border: #2a2a3a;
  --border-subtle: #1e1e2e;
  --text: #e4e4ef;
  --text-muted: #8888a0;
  --text-dim: #706f88;
  --accent: #7c5cfc;
  --accent-light: #9d85fd;
  --accent-glow: rgba(124, 92, 252, 0.3);
  --green: #4ade80;
  --green-dim: #22c55e;
  --yellow: #facc15;
  --red: #f87171;
  --blue: #60a5fa;
  --cyan: #22d3ee;
  --orange: #fb923c;
  --font-body: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1200px;
  --section-padding: clamp(80px, 12vh, 140px);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--accent-light);
  text-decoration: none;
  transition: color 0.2s;
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}

.nav--scrolled {
  border-bottom-color: var(--border-subtle);
  background: rgba(10, 10, 15, 0.95);
}

.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav__logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  position: absolute;
  left: 0;
  transition: transform 0.3s, opacity 0.3s;
}

.nav__toggle span:nth-child(1) { top: 0; }
.nav__toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav__toggle span:nth-child(3) { bottom: 0; }

.nav__toggle.active span:nth-child(1) { transform: translateY(11px) rotate(45deg); }
.nav__toggle.active span:nth-child(2) { opacity: 0; }
.nav__toggle.active span:nth-child(3) { transform: translateY(-11px) rotate(-45deg); }

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav__links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav__links a:hover {
  color: var(--text);
}

.nav__cta {
  background: var(--accent);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 8px;
  font-weight: 600;
}

.nav__cta:hover {
  background: var(--accent-light);
}

@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-elevated);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    transition: right 0.3s ease;
    border-left: 1px solid var(--border);
  }

  .nav__links.active {
    right: 0;
  }

  .nav__links a {
    font-size: 1.1rem;
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-family: var(--font-body);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.btn--primary:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.btn--ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

/* --- Sections --- */
.section {
  padding: var(--section-padding) 0;
  position: relative;
}

.section__header {
  text-align: center;
  margin-bottom: 64px;
}

.section__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 16px;
}

.section__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section__title em {
  font-style: normal;
  color: var(--accent-light);
}

.section__desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 100px 20px 60px;
  position: relative;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(124, 92, 252, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 92, 252, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 20%, transparent 70%);
}

.hero__glow {
  position: absolute;
  top: 20%;
  left: 50%;
  width: 800px;
  height: 600px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 60%);
  opacity: 0.4;
  filter: blur(80px);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  from { opacity: 0.3; transform: translateX(-50%) scale(1); }
  to { opacity: 0.5; transform: translateX(-50%) scale(1.1); }
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--bg-surface);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  animation: fadeInDown 0.8s ease;
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse 2s ease-in-out infinite;
}

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

.hero__title {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero__title-line {
  display: block;
  animation: fadeInUp 0.8s ease both;
}

.hero__title-line:nth-child(2) { animation-delay: 0.1s; }
.hero__title-line:nth-child(3) { animation-delay: 0.2s; }

.hero__title-accent {
  background: linear-gradient(135deg, var(--accent-light), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-muted);
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.3s both;
}

/* Hero Code Block */
.hero__code {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  text-align: left;
  max-width: 560px;
  margin: 0 auto 40px;
  animation: fadeInUp 0.8s ease 0.4s both;
}

.hero__code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.hero__code-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.hero__code-dot--red { background: #ff5f57; }
.hero__code-dot--yellow { background: #febc2e; }
.hero__code-dot--green { background: #28c840; }

.hero__code-filename {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.hero__code-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.8;
  overflow-x: auto;
}

.hero__code-body code {
  font-size: inherit;
}

.hero__code-output {
  padding: 12px 20px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero__code-prompt {
  color: var(--green);
  margin-right: 8px;
}

.hero__code-result {
  color: var(--text);
  font-weight: 700;
}

/* Syntax Highlighting */
.kw { color: #c678dd; font-weight: 700; }
.fn { color: #61afef; }
.val { color: var(--yellow); }
.cm { color: var(--orange); }
.var { color: var(--green); }
.io { color: var(--cyan); }
.ctrl { color: #e06c75; font-weight: 600; }
.cmt { color: var(--text-dim); font-style: italic; }

/* Hero Actions */
.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 60px;
  animation: fadeInUp 0.8s ease 0.5s both;
}

/* Hero Stats */
.hero__stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  animation: fadeInUp 0.8s ease 0.6s both;
}

.hero__stat {
  text-align: center;
}

.hero__stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.hero__stat-label {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Hero Scroll */
.hero__scroll {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  padding-top: 48px;
  padding-bottom: 16px;
  animation: fadeInUp 1s ease 1s both;
}

.hero__scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--text-dim);
  border-bottom: 2px solid var(--text-dim);
  transform: rotate(45deg);
  margin: 12px auto 0;
  animation: bounceDown 2s ease-in-out infinite;
}

@keyframes bounceDown {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(6px); }
}

/* --- Overview --- */
.overview__keywords {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 64px;
}

.overview__keyword {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px 24px;
  text-align: center;
  transition: transform 0.3s, border-color 0.3s;
}

.overview__keyword:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.overview__keyword-char {
  display: block;
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--accent-light), var(--cyan));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.overview__keyword-desc {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
}

.overview__keyword-detail {
  display: block;
  font-size: 0.8rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

/* Symbols */
.overview__symbols {
  margin-bottom: 64px;
  text-align: center;
}

.overview__symbols-title {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.overview__symbols-grid {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.overview__symbol {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 28px;
  min-width: 100px;
}

.overview__symbol code {
  font-size: 1.8rem;
  color: var(--yellow);
  font-weight: 700;
}

.overview__symbol span {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Tables */
.overview__table-wrap {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.overview__table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.overview__table th {
  background: var(--bg-elevated);
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.overview__table td {
  padding: 12px 20px;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.overview__table tbody tr:last-child td {
  border-bottom: none;
}

.overview__table tbody tr:hover {
  background: rgba(124, 92, 252, 0.03);
}

.overview__table-highlight {
  background: rgba(124, 92, 252, 0.08) !important;
}

.overview__table-highlight td {
  color: var(--accent-light);
}

.overview__kl {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.overview__kl--optimal {
  color: var(--green) !important;
  font-weight: 700;
}

.overview__footnote {
  margin-top: 20px;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-align: center;
  font-style: italic;
}

.overview__compare {
  margin-bottom: 64px;
}

.overview__compare-title,
.overview__syntax-title {
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: var(--text-muted);
}

.overview__table--syntax code {
  color: var(--accent-light);
  background: rgba(124, 92, 252, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
}

/* --- AI Native --- */
.ai-native {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

/* Chart */
.ai-native__chart {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  margin-bottom: 48px;
}

.ai-native__chart-title {
  font-size: 1rem;
  margin-bottom: 4px;
}

.ai-native__chart-source {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 32px;
}

.ai-native__chart-area {
  display: flex;
  gap: 16px;
  align-items: flex-end;
  height: 300px;
  padding-bottom: 40px;
}

.ai-native__chart-y {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  min-width: 40px;
  text-align: right;
}

.ai-native__bars {
  display: flex;
  gap: 16px;
  align-items: flex-end;
  flex: 1;
  height: 100%;
}

.ai-native__bar {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
  position: relative;
}

.ai-native__bar-fill {
  width: 100%;
  max-width: 60px;
  height: var(--bar-height);
  background: linear-gradient(180deg, var(--accent) 0%, rgba(124, 92, 252, 0.3) 100%);
  border-radius: 6px 6px 0 0;
  transition: height 1s ease;
  min-height: 2px;
}

.ai-native__bar--highlight .ai-native__bar-fill {
  background: linear-gradient(180deg, var(--green) 0%, rgba(74, 222, 128, 0.3) 100%);
  box-shadow: 0 0 20px rgba(74, 222, 128, 0.3);
}

.ai-native__bar-label {
  margin-top: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.ai-native__bar-value {
  position: absolute;
  top: calc(100% - var(--bar-height) - 24px);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
}

.ai-native__bar--highlight .ai-native__bar-label {
  color: var(--green);
}

.ai-native__bar--highlight .ai-native__bar-value {
  color: var(--green);
  font-weight: 700;
}

.ai-native__chart-footnote {
  margin-top: 24px;
  font-size: 0.75rem;
  color: var(--text-dim);
  text-align: center;
  font-style: italic;
}

/* Terminal Tabs */
.ai-native__terminals {
  max-width: min(740px, 100%);
  margin: 0 auto;
}

.terminal-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: -1px;
  overflow-x: auto;
  padding-bottom: 1px;
}

.terminal-tab {
  padding: 10px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
  font-family: var(--font-body);
}

.terminal-tab:hover {
  color: var(--text-muted);
}

.terminal-tab--active {
  background: var(--bg-elevated);
  color: var(--text);
  border-color: var(--border);
}

/* Terminal */
.terminal {
  display: none;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 0 12px 12px 12px;
  overflow: hidden;
}

.terminal[data-active] {
  display: block;
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--border-subtle);
}

.terminal__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal__dot--red { background: #ff5f57; }
.terminal__dot--yellow { background: #febc2e; }
.terminal__dot--green { background: #28c840; }

.terminal__title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

.terminal__body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
}

.terminal__line {
  margin-bottom: 8px;
}

.terminal__prompt {
  color: var(--green);
  margin-right: 8px;
  font-weight: 700;
}

.terminal__line--input {
  color: var(--text);
}

.terminal__line--response {
  color: var(--text-muted);
}

.terminal__line--file {
  color: var(--cyan);
}

.terminal__line--file::before {
  content: "📄 ";
}

.terminal__line--success {
  color: var(--green);
}

.terminal__line--success::before {
  content: "✓ ";
}

.terminal__line--output {
  color: var(--text);
  font-weight: 700;
  font-size: 1rem;
  padding: 8px 0;
}

.terminal__line--pass {
  color: var(--green);
}

.terminal__line--info {
  color: var(--blue);
}

.terminal__code {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 16px;
  margin: 12px 0;
  overflow-x: auto;
}

.terminal__code--compact {
  padding: 12px 16px;
}

.terminal__code pre {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
}

.terminal__divider {
  border-top: 1px solid var(--border-subtle);
  margin: 12px 0;
}

.terminal__caption {
  text-align: center;
  padding: 16px;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-subtle);
  font-style: italic;
}

/* --- Examples --- */
.examples__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
  margin-bottom: 64px;
}

.example-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.3s, border-color 0.3s;
}

.example-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.example-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px 12px;
}

.example-card__header h3 {
  font-size: 1.1rem;
  font-weight: 700;
}

.example-card__tag {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 100px;
  background: rgba(124, 92, 252, 0.1);
  color: var(--accent-light);
  font-weight: 500;
}

.example-card__code {
  padding: 0 24px;
}

.example-card__code pre {
  background: var(--bg);
  border-radius: 8px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
}

.example-card__code--minimal pre {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-body);
}

.example-card__output {
  padding: 16px 24px;
  background: var(--bg-elevated);
  margin: 16px 24px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.example-card__label {
  color: var(--text-dim);
  font-size: 0.8rem;
  display: block;
  margin-bottom: 4px;
}

.example-card__output code {
  color: var(--green);
  font-weight: 700;
  font-size: 1rem;
}

.example-card__desc {
  padding: 12px 24px 20px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.examples__results {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
}

.examples__results h3 {
  margin-bottom: 20px;
}

/* --- Math Section --- */
.math {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.math__block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px;
  margin-bottom: 32px;
  position: relative;
}

.math__block-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.math__block-title {
  font-size: 1.5rem;
  font-weight: 900;
  margin-bottom: 4px;
}

.math__block-subtitle {
  font-size: 0.9rem;
  color: var(--text-dim);
  font-style: italic;
  margin-bottom: 24px;
}

/* Mapping */
.math__mapping {
  display: flex;
  align-items: flex-start;
  gap: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.math__mapping-col {
  flex: 1;
  min-width: 200px;
}

.math__mapping-col h4 {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
}

.math__mapping-col ul {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.math__mapping-col li {
  padding: 6px 0;
  color: var(--text-muted);
}

.math__mapping-col li code {
  color: var(--accent-light);
}

.math__mapping-arrow {
  font-size: 2rem;
  color: var(--accent);
  padding-top: 40px;
}

.math__quote {
  border-left: 3px solid var(--accent);
  padding: 16px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  background: rgba(124, 92, 252, 0.03);
  border-radius: 0 8px 8px 0;
}

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

.math__quote--large {
  font-size: 1.2rem;
  text-align: center;
  border-left: none;
  border-top: 3px solid var(--accent);
  border-radius: 8px;
  padding: 32px;
}

/* Encoding */
.math__encoding {
  margin-bottom: 24px;
}

.math__encoding-compare {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.math__encoding-other,
.math__encoding-um {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.math__encoding-label {
  font-weight: 700;
  min-width: 80px;
}

.math__encoding-other code {
  color: var(--text-dim);
}

.math__encoding-um code {
  color: var(--accent-light);
}

.math__encoding-note {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.math__encoding-table {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.math__char {
  display: grid;
  grid-template-columns: 60px 180px 1fr;
  gap: 16px;
  align-items: center;
  padding: 8px 16px;
  background: var(--bg-elevated);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.math__char span:first-child {
  color: var(--yellow);
  font-weight: 700;
}

.math__char span:nth-child(2) {
  color: var(--text-muted);
}

.math__char code {
  color: var(--accent-light);
  font-size: 0.8rem;
}

/* Variables */
.math__vars {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.math__var-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: var(--bg-elevated);
  border-radius: 8px;
}

.math__var-row--highlight {
  background: rgba(124, 92, 252, 0.1);
  border: 1px solid rgba(124, 92, 252, 0.2);
}

.math__var-label {
  font-weight: 700;
  min-width: 120px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.math__var-row code {
  color: var(--text);
  font-size: 0.9rem;
}

.math__var-row--highlight code {
  color: var(--accent-light);
}

/* Zero test */
.math__zero {
  margin-bottom: 24px;
}

.math__zero-compare {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.math__zero-compare > div {
  padding: 12px 20px;
  background: var(--bg-elevated);
  border-radius: 8px;
  font-size: 0.9rem;
}

.math__zero-label {
  font-weight: 700;
  color: var(--text-muted);
  margin-right: 12px;
}

.math__zero-reductions {
  padding: 16px 20px;
  background: var(--bg-elevated);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 2;
  color: var(--text-muted);
}

.math__zero-reductions code {
  color: var(--accent-light);
}

/* Turing */
.math__turing {
  margin-bottom: 24px;
}

.math__turing-row {
  display: grid;
  grid-template-columns: 120px 40px 1fr;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.95rem;
}

.math__turing-row:last-of-type {
  border-bottom: none;
}

.math__turing-arrow {
  color: var(--accent);
  text-align: center;
}

.math__turing-row code {
  color: var(--accent-light);
}

.math__turing-extra {
  padding: 16px 20px;
  margin-top: 12px;
  background: var(--bg-elevated);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text-muted);
  text-align: center;
}

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

/* Climax block */
.math__block--climax {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--bg) 0%, rgba(124, 92, 252, 0.05) 100%);
}

/* --- Announcement --- */
.announcement__press {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  max-width: 800px;
  margin: 0 auto 48px;
}

.announcement__header {
  padding: 32px 40px;
  border-bottom: 2px solid var(--border);
  text-align: center;
}

.announcement__logo {
  font-size: 1.8rem;
  font-weight: 300;
  letter-spacing: 0.4em;
  margin-bottom: 12px;
  color: var(--text);
}

.announcement__meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.announcement__title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 900;
  padding: 32px 40px 0;
  line-height: 1.4;
}

.announcement__body {
  padding: 24px 40px 40px;
  line-height: 1.9;
  color: var(--text-muted);
}

.announcement__body p {
  margin-bottom: 16px;
}

.announcement__reasons {
  padding-left: 24px;
  margin-bottom: 24px;
}

.announcement__reasons li {
  margin-bottom: 8px;
}

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

.announcement__quote {
  margin: 32px 0;
  padding: 24px;
  background: var(--bg);
  border-radius: 12px;
  border-left: 3px solid var(--accent);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
}

.announcement__quote-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
}

.announcement__quote blockquote {
  font-size: 0.95rem;
  font-style: italic;
  line-height: 1.8;
  color: var(--text);
}

.announcement__quote cite {
  grid-column: 2;
  font-size: 0.85rem;
  color: var(--text-dim);
  font-style: normal;
}

.announcement__contact {
  font-size: 0.9rem;
  color: var(--text-dim);
}

.announcement__disclaimer {
  font-size: 0.75rem;
  opacity: 0.5;
}

/* Extra quotes */
.announcement__extras {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.announcement__extra {
  padding: 24px 32px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  transition: border-color 0.3s;
}

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

/* --- Getting Started --- */
.getting-started__steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.getting-started__step {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
  transition: transform 0.3s, border-color 0.3s;
}

.getting-started__step:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.getting-started__step-number {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.1rem;
  margin-bottom: 16px;
}

.getting-started__step h3 {
  margin-bottom: 16px;
  font-size: 1.1rem;
}

.getting-started__code {
  background: var(--bg);
  border-radius: 8px;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow-x: auto;
  margin-bottom: 8px;
}

.getting-started__code code {
  color: var(--green);
}

.getting-started__code-comment {
  display: block;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.getting-started__more {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
}

.getting-started__more h3 {
  margin-bottom: 20px;
}

.getting-started__examples {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* --- Footer --- */
.footer {
  padding: 80px 0 40px;
  text-align: center;
}

.footer__reveal {
  margin-bottom: 40px;
}

.footer__april {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent-light), var(--cyan), var(--yellow));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.footer__credit {
  font-size: 1rem;
  margin-bottom: 8px;
}

.footer__plugin {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.footer__disclaimer {
  font-size: 0.8rem;
  color: var(--text-dim);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
  opacity: 0.7;
}

.footer__bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* --- Skip Link --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: 0 0 8px 8px;
  z-index: 10000;
  font-size: 0.9rem;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
  color: #fff;
}

/* --- Focus Styles --- */
:focus-visible {
  outline: 2px solid var(--accent-light);
  outline-offset: 2px;
}

/* --- Scroll Reveal Animations --- */
[data-reveal] {
  opacity: 1;
  transform: none;
}

.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js-enabled [data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* --- Bar Chart Animation --- */
.js-enabled .ai-native__bar-fill {
  height: 0 !important;
  transition: height 1s ease;
}

.js-enabled .ai-native__bars.animated .ai-native__bar-fill {
  height: var(--bar-height) !important;
}

/* --- Mobile Nav Scroll Lock --- */
body.nav-open {
  overflow: hidden;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero__scroll {
    display: none;
  }

  .hero__stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .overview__keywords {
    grid-template-columns: repeat(2, 1fr);
  }

  .math__mapping {
    flex-direction: column;
  }

  .math__mapping-arrow {
    padding-top: 0;
    text-align: center;
  }

  .math__char {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .math__turing-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .math__turing-arrow {
    display: none;
  }

  .ai-native__chart {
    padding: 20px;
  }

  .ai-native__chart-area {
    height: 200px;
  }

  .announcement__header,
  .announcement__body {
    padding-left: 24px;
    padding-right: 24px;
  }

  .announcement__quote {
    grid-template-columns: 1fr;
  }

  .announcement__quote-avatar {
    justify-self: start;
  }

  .announcement__quote cite {
    grid-column: 1;
  }

  .math__block {
    padding: 24px;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .examples__grid {
    grid-template-columns: 1fr;
  }

  .terminal-tabs {
    gap: 2px;
  }

  .terminal-tab {
    padding: 8px 12px;
    font-size: 0.75rem;
  }

  .terminal__body {
    padding: 12px;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .overview__keywords {
    grid-template-columns: 1fr;
  }

  .hero__stat-number {
    font-size: 2rem;
  }

  .math__var-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .math__var-label {
    min-width: auto;
  }

  .getting-started__steps {
    grid-template-columns: 1fr;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .js-enabled [data-reveal] {
    opacity: 1;
    transform: none;
  }
}