/* Modern Dark Glassmorphic Design System for hf.app */

:root {
  --bg-dark: #090d16;
  --bg-surface: rgba(18, 24, 38, 0.75);
  --bg-surface-hover: rgba(30, 41, 64, 0.85);
  --bg-card: rgba(26, 34, 52, 0.6);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(255, 210, 30, 0.3);
  
  --hf-yellow: #FFD21E;
  --hf-yellow-glow: rgba(255, 210, 30, 0.25);
  --accent-purple: #8B5CF6;
  --accent-blue: #3B82F6;
  --accent-cyan: #06B6D4;
  
  --text-main: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 35px rgba(255, 210, 30, 0.12);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, rgba(255, 210, 30, 0.08) 0%, transparent 60%),
              radial-gradient(circle at 80% 40%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
              var(--bg-dark);
  min-height: 100vh;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--text-main);
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.2rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.4rem;
}

p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, #FFF 0%, var(--hf-yellow) 50%, #F59E0B 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-accent {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 50%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(9, 13, 22, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text-main);
}

.brand-badge {
  font-size: 1.4rem;
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--hf-yellow);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--hf-yellow) 0%, #F59E0B 100%);
  color: #000;
  font-weight: 700;
  box-shadow: 0 4px 20px rgba(255, 210, 30, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255, 210, 30, 0.4);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--border-highlight);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  padding: 160px 0 80px;
  text-align: center;
  position: relative;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(255, 210, 30, 0.1);
  border: 1px solid rgba(255, 210, 30, 0.25);
  color: var(--hf-yellow);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-subtitle {
  max-width: 720px;
  margin: 24px auto 40px;
  font-size: 1.25rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero-meta {
  margin: -40px auto 56px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.hero-meta strong { color: var(--hf-yellow); }

.hero-meta a {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dashed var(--border-highlight);
  transition: var(--transition);
}

.hero-meta a:hover { color: var(--hf-yellow); }

.hero-visual {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  padding: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-glow), var(--shadow-card);
  backdrop-filter: blur(12px);
  overflow: hidden;
}

.hero-visual img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}

/* Feature Cards Grid */
.features {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-header p {
  margin-top: 16px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-6px);
  border-color: var(--border-highlight);
  box-shadow: 0 15px 35px -10px rgba(0,0,0,0.5), 0 0 25px rgba(255, 210, 30, 0.1);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(255, 210, 30, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--hf-yellow);
  margin-bottom: 24px;
}

.card h3 {
  margin-bottom: 12px;
}

/* Feature Showcase Section */
.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 100px;
}

.showcase-row.reverse {
  direction: rtl;
}

.showcase-row.reverse > * {
  direction: ltr;
}

.showcase-content h3 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.showcase-content p {
  margin-bottom: 24px;
}

.showcase-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.showcase-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
  font-weight: 500;
}

.showcase-list li span {
  color: var(--hf-yellow);
}

.showcase-img-wrap {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  background: var(--bg-card);
}

.showcase-img-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

/* Documentation Tabs Section */
.docs-section {
  padding: 100px 0;
  background: rgba(12, 17, 29, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.tabs-header {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 10px 24px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.2);
}

.tab-btn.active {
  background: var(--hf-yellow);
  color: #000;
  border-color: var(--hf-yellow);
  box-shadow: 0 4px 15px rgba(255, 210, 30, 0.3);
}

.tab-content {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(12px);
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Code Snippets */
.code-block {
  background: #050811;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #E2E8F0;
  position: relative;
  overflow-x: auto;
  margin: 20px 0;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.copy-btn {
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
}

.copy-btn:hover {
  background: var(--hf-yellow);
  color: #000;
}

/* Architecture Module Map (Codebase tab) */
.arch-map {
  display: flex;
  flex-direction: column;
  gap: 26px;
  margin-top: 24px;
}

.arch-group-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.arch-group-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

.arch-row {
  display: grid;
  grid-template-columns: minmax(150px, 190px) 1fr auto;
  gap: 6px 22px;
  align-items: baseline;
  padding: 13px 6px;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.arch-row:last-child { border-bottom: none; }
.arch-row:hover { background: rgba(255, 210, 30, 0.04); }

.arch-file {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--hf-yellow);
}

.arch-role {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.arch-role code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.06);
  padding: 1px 5px;
  border-radius: 5px;
}

.arch-loc {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  text-align: right;
}

@media (max-width: 640px) {
  .arch-row {
    grid-template-columns: 1fr auto;
    gap: 4px 16px;
  }
  .arch-role { grid-column: 1 / -1; }
}

/* Footer (Vaked Constellation Style) */
footer {
  padding: 60px 0 40px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

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

/* Constellation Footer Links */
.constellation {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.9;
  word-break: break-word;
  text-align: center;
}

.constellation b {
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.4px;
}

.constellation a {
  color: var(--text-dim);
  text-decoration: none;
  transition: var(--transition);
}

.constellation a:hover {
  color: var(--hf-yellow);
}

.constellation .sep {
  opacity: 0.55;
}

/* Responsive */
@media (max-width: 900px) {
  .showcase-row, .showcase-row.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .nav-links {
    display: none;
  }
  .hero {
    padding-top: 130px;
  }
}