/* ==========================================================================
   AgentHub — Apple-Inspired Design System
   Modern Vanilla CSS • High-DPI • Dark/Light Mode Responsive
   ========================================================================== */

:root {
  /* Colors - Light Theme Default */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F5F7;
  --bg-tertiary: #E8E8ED;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.95);
  
  --text-primary: #1D1D1F;
  --text-secondary: #6E6E73;
  --text-tertiary: #86868B;
  
  --border-light: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.16);
  --border-focus: #0071E3;
  
  --accent-blue: #0071E3;
  --accent-cyan: #06B6D4;
  --accent-purple: #8B5CF6;
  --accent-pink: #EC4899;
  --accent-orange: #F97316;
  --accent-green: #10B981;
  --accent-red: #EF4444;

  --gradient-hero: linear-gradient(135deg, #0071E3 0%, #8B5CF6 50%, #EC4899 100%);
  --gradient-glow: radial-gradient(circle at 50% 30%, rgba(99, 102, 241, 0.15) 0%, rgba(0, 113, 227, 0.05) 50%, transparent 80%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.12);
  --shadow-window: 0 32px 80px -16px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(0, 0, 0, 0.08);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-pill: 9999px;

  --nav-height: 64px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "PingFang TC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
}

[data-theme="dark"] {
  --bg-primary: #0A0A0C;
  --bg-secondary: #141418;
  --bg-tertiary: #1E1E24;
  --bg-card: rgba(22, 22, 28, 0.75);
  --bg-card-hover: rgba(30, 30, 38, 0.9);
  
  --text-primary: #F5F5F7;
  --text-secondary: #A1A1A6;
  --text-tertiary: #6E6E73;
  
  --border-light: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --border-focus: #2997FF;
  
  --accent-blue: #2997FF;
  --gradient-glow: radial-gradient(circle at 50% 30%, rgba(139, 92, 246, 0.25) 0%, rgba(41, 151, 255, 0.1) 50%, transparent 80%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.6);
  --shadow-window: 0 32px 90px -16px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.12);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

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

html {
  font-family: var(--font-sans);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* ==========================================================================
   Navigation Bar
   ========================================================================== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.15rem;
}

.nav-brand img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

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

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

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

.theme-toggle, .lang-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle:hover, .lang-select:hover {
  border-color: var(--border-strong);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-pill);
  padding: 2px;
  gap: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn:hover {
  color: var(--text-primary);
}

.lang-btn.is-active {
  background: var(--bg-primary);
  color: var(--text-primary);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
}

.btn-nav-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-blue);
  color: #FFFFFF !important;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.btn-nav-download:hover {
  transform: scale(1.03);
  opacity: 0.95;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
  position: relative;
  padding-top: calc(var(--nav-height) + 70px);
  padding-bottom: 80px;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 600px;
  background: var(--gradient-glow);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-strong);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-green);
  box-shadow: 0 0 10px var(--accent-green);
}

.hero-title {
  font-size: clamp(2.8rem, 6vw, 4.8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 20px;
}

.gradient-text {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 36px;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent-blue);
  color: #FFFFFF;
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 10px 25px rgba(0, 113, 227, 0.3);
  transition: all 0.25s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(0, 113, 227, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  padding: 14px 28px;
  border-radius: var(--radius-pill);
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--text-primary);
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

/* ==========================================================================
   macOS Window Showcase / Interactive Preview
   ========================================================================== */

.showcase-window {
  max-width: 1060px;
  margin: 0 auto;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-window);
  overflow: hidden;
  text-align: left;
}

.window-titlebar {
  display: flex;
  align-items: center;
  padding: 14px 18px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-light);
  gap: 16px;
}

.window-traffic-lights {
  display: flex;
  gap: 8px;
}

.light {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.light.red { background: #FF5F56; }
.light.yellow { background: #FFBD2E; }
.light.green { background: #27C93F; }

.window-tabs {
  display: flex;
  gap: 6px;
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: 8px;
}

.window-tab {
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.window-tab.active {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.window-content {
  padding: 24px;
  min-height: 440px;
  background: var(--bg-primary);
}

/* Window Screen Inside */
.mock-hub-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(135deg, rgba(0, 113, 227, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
  border: 1px solid rgba(0, 113, 227, 0.25);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 20px;
}

.mock-hub-info h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.mock-hub-info p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.mock-btn-sync {
  background: var(--accent-blue);
  color: #FFFFFF;
  border: none;
  padding: 8px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
}

.mock-agent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.mock-agent-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.mock-agent-card.installed {
  border-color: rgba(16, 185, 129, 0.3);
}

.mock-agent-card .icon {
  font-size: 1.4rem;
}

.mock-agent-card .info .name {
  font-size: 0.9rem;
  font-weight: 600;
}

.mock-agent-card .info .status {
  font-size: 0.75rem;
  color: var(--accent-green);
  font-weight: 600;
}

.mock-metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.mock-metric-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 14px;
}

.mock-metric-box .num {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--font-mono);
}

.mock-metric-box .label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Bento Box Features Grid
   ========================================================================== */

.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 36px;
  transition: all 0.3s ease;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.bento-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.bento-card.col-8 { grid-column: span 8; }
.bento-card.col-4 { grid-column: span 4; }
.bento-card.col-6 { grid-column: span 6; }
.bento-card.col-12 { grid-column: span 12; }

.bento-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-tertiary);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.bento-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.bento-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 24px;
}

.bento-visual {
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ==========================================================================
   Interactive Terminal Showcase
   ========================================================================== */

.terminal-box {
  background: #0D1117;
  color: #C9D1D9;
  border-radius: var(--radius-lg);
  padding: 20px;
  font-family: var(--font-mono);
  box-shadow: var(--shadow-lg);
  border: 1px solid #30363D;
}

.terminal-header {
  display: flex;
  gap: 6px;
  margin-bottom: 14px;
}

.terminal-header span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.t-red { background: #FF5F56; }
.t-yellow { background: #FFBD2E; }
.t-green { background: #27C93F; }

.terminal-line {
  margin: 6px 0;
  line-height: 1.6;
}

.t-prompt { color: #58A6FF; font-weight: bold; }
.t-success { color: #3FB950; font-weight: bold; }
.t-dim { color: #8B949E; }
.t-badge { background: #1F6FEB; color: #FFF; padding: 2px 6px; border-radius: 4px; font-size: 0.75rem; }

/* ==========================================================================
   Download Section
   ========================================================================== */

.download-card {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.download-title {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.download-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 36px;
}

.download-btns {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.download-meta {
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border-light);
  padding: 50px 0 30px;
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 30px;
}

.footer-brand {
  font-weight: 700;
  color: var(--text-primary);
  font-size: 1.1rem;
}

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

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
  font-size: 0.8rem;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 900px) {
  .bento-card.col-8,
  .bento-card.col-4,
  .bento-card.col-6 {
    grid-column: span 12;
  }

  .nav-links {
    display: none;
  }

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