:root {
  --bg: #080b0f;
  --bg2: #0d1117;
  --bg3: #111820;
  --border: #1e2d3d;
  --accent: #00ffe0;
  --accent2: #ff6b35;
  --text: #c9d4e0;
  --text-dim: #546878;
  --kw: #ff6b9d;
  --fn: #79c0ff;
  --str: #a8ff78;
  --num: #ffab70;
  --font-mono: 'JetBrains Mono', monospace;
  --font-display: 'Syne', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Scanlines overlay */
.scanlines {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.08) 2px,
    rgba(0,0,0,0.08) 4px
  );
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  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='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* NAV */
nav {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  padding: 0 2rem;
  height: 56px;
  background: rgba(8,11,15,0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
  text-decoration: none;
  flex: 1;
}

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

/* Desktop links — right side */
.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-left: auto;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  transition: color 0.2s;
  white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active { color: var(--accent); }

.lang-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.28rem 0.65rem;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.1em;
  margin-left: 0.5rem;
}

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

/* Hamburger button — mobile only */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: transparent;
  border: 1px solid var(--border);
  cursor: pointer;
  order: -1; /* left side */
  margin-right: 1rem;
  transition: border-color 0.2s;
}

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

.nav-burger span {
  display: block;
  height: 1.5px;
  background: var(--text);
  transition: all 0.25s;
  transform-origin: center;
}

.nav-burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-burger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile drawer */
.nav-drawer {
  display: none;
  position: fixed;
  top: 56px;
  left: 0;
  width: 100%;
  background: rgba(8,11,15,0.97);
  border-bottom: 1px solid var(--border);
  z-index: 199;
  flex-direction: column;
  padding: 1rem 1.5rem 1.5rem;
  gap: 0.2rem;
  backdrop-filter: blur(14px);
  transform: translateY(-8px);
  opacity: 0;
  transition: opacity 0.2s, transform 0.2s;
}

.nav-drawer.open {
  opacity: 1;
  transform: translateY(0);
}

.nav-drawer a {
  display: block;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
  letter-spacing: 0.04em;
}

.nav-drawer a:last-child { border-bottom: none; }
.nav-drawer a:hover,
.nav-drawer a.active { color: var(--accent); }

.nav-drawer .drawer-lang {
  margin-top: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.nav-drawer .drawer-lang button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.7rem;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-drawer .drawer-lang button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

@media (max-width: 700px) {
  .nav-burger { display: flex; }
  .nav-links { display: none; }
  .nav-drawer { display: flex; }
  nav { padding: 0 1rem; }
}

/* HERO */
.hero {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse at top, rgba(0,255,224,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.terminal-badge {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--accent);
  border: 1px solid rgba(0,255,224,0.3);
  padding: 0.3rem 0.8rem;
  margin-bottom: 2rem;
  letter-spacing: 0.15em;
  animation: pulse-border 2s infinite;
}

@keyframes pulse-border {
  0%, 100% { border-color: rgba(0,255,224,0.3); }
  50% { border-color: rgba(0,255,224,0.7); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: #fff;
  margin-bottom: 1.5rem;
}

.accent-word {
  color: var(--accent);
  text-shadow: 0 0 40px rgba(0,255,224,0.4);
}

.hero-sub {
  max-width: 500px;
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 2.5rem;
}

/* CODE BLOCK */
.hero-code {
  width: 100%;
  max-width: 520px;
  background: var(--bg2);
  border: 1px solid var(--border);
  margin-bottom: 2.5rem;
  text-align: left;
  box-shadow: 0 0 60px rgba(0,255,224,0.04), 0 20px 60px rgba(0,0,0,0.5);
}

.code-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg3);
}

.dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.dot.red { background: #ff5f57; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #28c840; }

.code-filename {
  margin-left: 0.5rem;
  font-size: 0.7rem;
  color: var(--text-dim);
}

.code-block {
  padding: 1.5rem;
  font-size: 0.82rem;
  line-height: 1.9;
  overflow-x: auto;
}

.kw { color: var(--kw); }
.fn { color: var(--fn); }
.str { color: var(--str); }
.num { color: var(--num); }

/* BUTTONS */
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: #000;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: #fff;
  box-shadow: 0 0 30px rgba(0,255,224,0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.75rem 1.5rem;
  text-decoration: none;
  border: 1px solid var(--border);
  transition: all 0.2s;
}

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

/* FEATURES */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1px;
  background: var(--border);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 4rem 0;
}

.feature-card {
  background: var(--bg);
  padding: 2.5rem 2rem;
  transition: background 0.2s;
}

.feature-card:hover { background: var(--bg2); }

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.7rem;
}

.feature-card p {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.8;
}

/* CTA */
.cta {
  text-align: center;
  padding: 4rem 2rem;
}

.cta h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.7rem;
}

.cta p {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 2rem;
}

/* FOOTER */
footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-dim);
}

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

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

/* DOCS PAGE */
.page-layout {
  display: flex;
  min-height: calc(100vh - 60px);
}

.sidebar {
  width: 240px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 2rem 0;
  position: sticky;
  top: 60px;
  height: calc(100vh - 60px);
  overflow-y: auto;
}

.sidebar-section {
  margin-bottom: 2rem;
  padding: 0 1.5rem;
}

.sidebar-label {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 0.7rem;
}

.sidebar-link {
  display: block;
  font-size: 0.78rem;
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.35rem 0;
  transition: color 0.2s;
  border-left: 2px solid transparent;
  padding-left: 0.5rem;
  margin-left: -0.5rem;
}

.sidebar-link:hover,
.sidebar-link.active {
  color: var(--accent);
  border-left-color: var(--accent);
}

.doc-content {
  flex: 1;
  padding: 3rem;
  max-width: 780px;
}

.doc-content h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1rem;
}

.doc-content h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  color: #fff;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.doc-content h3 {
  font-size: 1rem;
  color: var(--accent);
  margin: 1.5rem 0 0.5rem;
}

.doc-content p {
  font-size: 0.85rem;
  line-height: 1.9;
  color: var(--text);
  margin-bottom: 1rem;
}

.doc-content pre {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 1.2rem 1.5rem;
  overflow-x: auto;
  margin: 1.2rem 0;
  font-size: 0.8rem;
  line-height: 1.8;
}

.doc-content code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 0.1em 0.4em;
  color: var(--accent);
}

.doc-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
}

/* EXAMPLES */
.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
}

.example-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  transition: border-color 0.2s;
}

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

.example-title {
  padding: 1rem 1.2rem;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  border-bottom: 1px solid var(--border);
}

.example-card pre {
  padding: 1.2rem;
  font-size: 0.78rem;
  line-height: 1.8;
  overflow-x: auto;
}

/* DOWNLOAD */
.download-section {
  max-width: 700px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.download-section h1 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.5rem;
}

.version-badge {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--accent);
  border: 1px solid rgba(0,255,224,0.3);
  padding: 0.2rem 0.6rem;
  margin-bottom: 2rem;
  letter-spacing: 0.1em;
}

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin: 2rem 0;
}

.platform-card {
  background: var(--bg);
  padding: 1.8rem 1.5rem;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: background 0.2s;
}

.platform-card:hover { background: var(--bg3); }

.platform-icon { font-size: 1.8rem; }

.platform-name {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
}

.platform-ext {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.download-note {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.8;
}

.download-note a { color: var(--accent); text-decoration: none; }

/* Page header for inner pages */
.page-header {
  padding: 3rem 2rem 1rem;
  border-bottom: 1px solid var(--border);
}

.page-header h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
}

.page-header p {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

/* ── DOWNLOAD v2 — checkbox picker ── */
.dl-wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.dl-wrap h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.4rem;
}

.dl-picker {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin: 2rem 0 2.5rem;
}

.dl-group-label {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.dl-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.dl-option {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  background: var(--bg2);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  user-select: none;
}

.dl-option:hover { border-color: rgba(0,255,224,0.4); }

.dl-option input[type="radio"],
.dl-option input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--text-dim);
  flex-shrink: 0;
  position: relative;
  cursor: pointer;
  transition: border-color 0.15s;
}

.dl-option input[type="radio"] { border-radius: 50%; }

.dl-option input[type="radio"]:checked,
.dl-option input[type="checkbox"]:checked {
  border-color: var(--accent);
  background: var(--accent);
}

.dl-option input[type="radio"]:checked::after {
  content: '';
  display: block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: #000;
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}

.dl-option input[type="checkbox"]:checked::after {
  content: '✓';
  display: block;
  color: #000;
  font-size: 9px;
  font-weight: 900;
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  line-height: 1;
}

.dl-option.selected {
  border-color: var(--accent);
  background: rgba(0,255,224,0.04);
}

.dl-option-icon { font-size: 1.1rem; }

.dl-option-text { font-size: 0.82rem; color: var(--text); }
.dl-option-sub { font-size: 0.68rem; color: var(--text-dim); }

.dl-btn-wrap { margin-top: 0.5rem; }

#dl-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--accent);
  color: #000;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.88rem;
  padding: 0.85rem 2rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}

#dl-btn:hover { background: #fff; box-shadow: 0 0 30px rgba(0,255,224,0.35); }
#dl-btn:disabled { background: var(--border); color: var(--text-dim); cursor: not-allowed; box-shadow: none; }

.dl-status {
  margin-top: 0.8rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  min-height: 1.2em;
}

.dl-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.dl-extra-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 1rem;
}

/* ── FAQ ── */
.faq-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.faq-wrap h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.4rem;
}

.faq-wrap .subtitle {
  color: var(--text-dim);
  font-size: 0.82rem;
  margin-bottom: 2.5rem;
}

.faq-list { display: flex; flex-direction: column; gap: 0; }

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 0;
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--text);
  transition: color 0.2s;
  gap: 1rem;
  list-style: none;
}

.faq-q:hover { color: var(--accent); }

.faq-q::after {
  content: '+';
  color: var(--accent);
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.faq-item.open .faq-q::after { transform: rotate(45deg); }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.2s;
  font-size: 0.8rem;
  color: var(--text-dim);
  line-height: 1.9;
}

.faq-item.open .faq-a {
  max-height: 400px;
  padding-bottom: 1.2rem;
}

.faq-a code {
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 0.1em 0.4em;
  font-size: 0.75rem;
}

/* ── PDF GUIDE ── */
.guide-wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.guide-wrap h1 {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.4rem;
}

.guide-wrap .subtitle {
  color: var(--text-dim);
  font-size: 0.82rem;
  margin-bottom: 2.5rem;
}

.pdf-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  padding: 2rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  transition: border-color 0.2s;
}

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

.pdf-icon { font-size: 2.5rem; flex-shrink: 0; }

.pdf-info { flex: 1; }

.pdf-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.3rem;
}

.pdf-meta { font-size: 0.72rem; color: var(--text-dim); margin-bottom: 0.8rem; }

.toc-list {
  list-style: none;
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.toc-list li {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.toc-num {
  font-size: 0.65rem;
  color: var(--accent);
  width: 1.5rem;
  flex-shrink: 0;
}

/* Mobile general */
@media (max-width: 640px) {
  .hero { padding: 3rem 1rem 2rem; }
  .doc-content { padding: 1.5rem; }
  .sidebar { display: none; }
  .examples-grid { padding: 1rem; grid-template-columns: 1fr; }
  .dl-wrap, .faq-wrap, .guide-wrap { padding: 2rem 1rem 3rem; }
  .dl-picker { grid-template-columns: 1fr; gap: 1.5rem; }
  .pdf-card { flex-direction: column; text-align: center; }
}