/* ============================================
   NPU-STACK Promotional Website
   Made by Fanalogy · Powered by Nirvana
   ============================================ */

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

:root {
  --bg: #0a0f1e;
  --bg-card: rgba(15, 23, 42, 0.7);
  --bg-dark: #060a16;
  --text: #e2e8f0;
  --text-muted: #64748b;
  --text-dim: #475569;
  --accent-blue: #3b82f6;
  --accent-green: #10b981;
  --accent-purple: #8b5cf6;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --accent-cyan: #06b6d4;
  --accent-pink: #ec4899;
  --border: rgba(148, 163, 184, 0.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --glow-blue: 0 0 30px rgba(59,130,246,0.15);
  --glow-green: 0 0 30px rgba(16,185,129,0.15);
  --glow-purple: 0 0 30px rgba(139,92,246,0.15);
}

html { scroll-behavior: smooth; }

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

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Navigation ──────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 15, 30, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.nav-logo {
  font-size: 22px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); text-decoration: none; }

/* ─── Buttons ─────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  transition: all 0.25s ease;
  cursor: pointer;
  border: none;
}

.btn:hover { text-decoration: none; transform: translateY(-2px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: white;
  box-shadow: var(--glow-blue);
}

.btn-primary:hover {
  box-shadow: 0 0 40px rgba(59,130,246,0.3), 0 8px 24px rgba(0,0,0,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.15);
}

.btn-outline:hover {
  border-color: var(--accent-blue);
  background: rgba(59,130,246,0.08);
}

.btn-nav {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
}

.btn-nav:hover {
  background: rgba(255,255,255,0.12);
}

.btn-sponsor {
  background: linear-gradient(135deg, var(--accent-pink), var(--accent-red));
  color: white;
  box-shadow: 0 0 30px rgba(236,72,153,0.15);
}

.btn-sponsor:hover {
  box-shadow: 0 0 40px rgba(236,72,153,0.3), 0 8px 24px rgba(0,0,0,0.3);
}

.btn-lg { padding: 14px 28px; font-size: 16px; }

/* ─── Hero ────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(59,130,246,0.12), transparent 60%),
    radial-gradient(ellipse 40% 40% at 80% 80%, rgba(139,92,246,0.08), transparent 50%),
    radial-gradient(ellipse 30% 30% at 10% 60%, rgba(16,185,129,0.06), transparent 50%);
  animation: heroPulse 8s ease-in-out infinite;
}

@keyframes heroPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 50px;
  border: 1px solid rgba(59,130,246,0.3);
  background: rgba(59,130,246,0.08);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 28px;
  letter-spacing: 0.5px;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

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

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

.stat-value {
  font-size: 28px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ─── Sections ────────────────────────── */
.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}

.section-sub {
  text-align: center;
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 56px;
}

/* ─── Features Grid ───────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.feature-card {
  padding: 32px 28px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59,130,246,0.3);
  box-shadow: var(--glow-blue);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ─── Hardware Grid ───────────────────── */
.hardware-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.hw-card {
  padding: 28px 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}

.hw-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
}

.hw-green::before { background: var(--accent-green); }
.hw-red::before { background: var(--accent-red); }
.hw-blue::before { background: var(--accent-blue); }
.hw-amber::before { background: var(--accent-amber); }
.hw-purple::before { background: var(--accent-purple); }
.hw-cyan::before { background: var(--accent-cyan); }

.hw-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--glow-blue);
}

.hw-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.hw-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}

.hw-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 50px;
  font-size: 11px;
  font-weight: 700;
  background: rgba(16,185,129,0.12);
  color: var(--accent-green);
}

/* ─── Steps ───────────────────────────── */
.steps {
  display: flex;
  flex-direction: column;
  gap: 24px;
  max-width: 700px;
  margin: 0 auto;
}

.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  color: white;
  font-weight: 800;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-content code {
  display: block;
  background: rgba(0,0,0,0.4);
  padding: 10px 16px;
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent-green);
  margin: 8px 0;
  word-break: break-all;
}

.step-content p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ─── CTA ─────────────────────────────── */
.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 32px;
}

/* ─── Footer ──────────────────────────── */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.footer-sep { color: var(--text-dim); margin: 0 4px; }

.fanalogy { color: var(--accent-green); }
.nirvana {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
}

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

/* ─── GitHub Badges ───────────────────── */
.github-badges {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.github-badges a { text-decoration: none; }
.github-badges img { height: 28px; transition: transform 0.2s; }
.github-badges img:hover { transform: scale(1.08); }

.star-button {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
}

/* ─── API Grid ────────────────────────── */
.api-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 48px;
}

.api-card {
  padding: 24px 20px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.api-card:hover {
  border-color: rgba(59,130,246,0.3);
  transform: translateY(-3px);
}

.api-method {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 800;
  font-family: var(--mono);
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.api-method.get {
  background: rgba(16,185,129,0.15);
  color: var(--accent-green);
}

.api-method.post {
  background: rgba(59,130,246,0.15);
  color: var(--accent-blue);
}

.api-path {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.api-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ─── Code Tabs ───────────────────────── */
.code-tabs {
  max-width: 700px;
  margin: 0 auto 48px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.code-tab-header {
  display: flex;
  background: rgba(0,0,0,0.4);
  border-bottom: 1px solid var(--border);
}

.code-tab {
  padding: 10px 24px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 2px solid transparent;
}

.code-tab:hover { color: var(--text); }
.code-tab.active {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
  background: rgba(59,130,246,0.06);
}

.code-panel pre {
  margin: 0;
  padding: 24px;
  background: rgba(0,0,0,0.3);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--text);
  overflow-x: auto;
}

.code-panel .kw { color: var(--accent-purple); }
.code-panel .str { color: var(--accent-green); }
.code-panel .num { color: var(--accent-amber); }
.code-panel .cm { color: var(--text-dim); }

/* ─── Compatibility Grid ─────────────── */
.compat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  max-width: 700px;
  margin: 0 auto;
}

.compat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 14px;
}

.compat-check { font-size: 18px; }

/* ─── Docs Sidebar Layout ────────────── */
.docs-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 24px 60px;
  min-height: 100vh;
}

.docs-sidebar {
  position: sticky;
  top: 84px;
  align-self: start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}

.docs-sidebar h4 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  margin: 20px 0 8px;
}

.docs-sidebar a {
  display: block;
  padding: 6px 12px;
  font-size: 14px;
  color: var(--text-muted);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s;
}

.docs-sidebar a:hover, .docs-sidebar a.active {
  background: rgba(59,130,246,0.08);
  color: var(--accent-blue);
}

.docs-content {
  min-width: 0;
}

.docs-content h2 {
  font-size: 24px;
  font-weight: 800;
  margin: 48px 0 16px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.docs-content h2:first-child { border-top: none; margin-top: 0; }

.docs-content h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--accent-blue);
}

.docs-content p { margin-bottom: 16px; color: var(--text-muted); font-size: 15px; line-height: 1.8; }
.docs-content ul { margin-bottom: 16px; padding-left: 24px; }
.docs-content li { margin-bottom: 6px; color: var(--text-muted); font-size: 14px; }

.docs-content code {
  background: rgba(0,0,0,0.3);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent-green);
}

.docs-content pre {
  background: rgba(0,0,0,0.4);
  padding: 20px 24px;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  overflow-x: auto;
  margin-bottom: 24px;
  border: 1px solid var(--border);
  color: var(--text);
}

.docs-content pre .kw { color: var(--accent-purple); }
.docs-content pre .str { color: var(--accent-green); }
.docs-content pre .cm { color: var(--text-dim); }

.docs-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 14px;
}

.docs-content th {
  text-align: left;
  padding: 10px 14px;
  background: rgba(0,0,0,0.3);
  font-weight: 700;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
}

.docs-content td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .docs-layout { grid-template-columns: 1fr; padding-top: 80px; }
  .docs-sidebar { position: static; }
}

/* ─── Responsive ──────────────────────── */
@media (max-width: 768px) {
  .nav-links a:not(.btn-nav) { display: none; }
  .hero h1 { font-size: 2.2rem; }
  .hero-stats { gap: 24px; }
  .features-grid, .hardware-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
}