:root {
  --bg-canvas: #0d1117;
  --bg-subtle: #161b22;
  --bg-muted: #21262d;
  --bg-inset: #010409;
  --border-default: #30363d;
  --border-muted: #21262d;
  --border-subtle: rgba(240, 246, 252, 0.1);
  --fg-default: #e6edf3;
  --fg-muted: #848d97;
  --fg-subtle: #6e7681;
  --accent-primary: #2f81f7;
  --accent-cyan: #38bdf8;
  --accent-purple: #bc8cff;
  --accent-green: #3fb950;
  --accent-yellow: #d29922;
  --accent-red: #f85149;
  --accent-orange: #f78166;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-subtle: 0 1px 0 rgba(255, 255, 255, 0.04) inset;
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(0, 0, 0, 0.8);
  --glow-blue: 0 0 40px rgba(47, 129, 247, 0.25);
  --glow-purple: 0 0 50px rgba(188, 140, 255, 0.2);
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-canvas);
  color: var(--fg-default);
  line-height: 1.5;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(56, 189, 248, 0.15), transparent),
    radial-gradient(circle 500px at 80% 20%, rgba(188, 140, 255, 0.08), transparent);
  min-height: 100vh;
}

/* Utilities */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
  width: 100%;
  box-sizing: border-box;
}

@media (max-width: 768px) {
  .container {
    padding: 0 24px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 20px;
  }
}

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

a:hover {
  text-decoration: underline;
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: rgba(13, 17, 23, 0.85);
  border-bottom: 1px solid var(--border-muted);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--fg-default);
  text-decoration: none;
  flex-shrink: 0;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #2f81f7, #bc8cff);
  border-radius: var(--radius-md);
  color: #ffffff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  color: var(--fg-muted);
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--fg-default);
  text-decoration: none;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  color: var(--fg-default);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.mobile-nav-drawer {
  display: none;
  flex-direction: column;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-default);
  padding: 16px;
  gap: 12px;
}

.mobile-nav-drawer.open {
  display: flex;
}

.mobile-nav-link {
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--fg-default);
  border-radius: var(--radius-sm);
  background-color: var(--bg-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: #238636;
  color: #ffffff;
  border-color: rgba(240, 246, 252, 0.1);
  box-shadow: 0 0 12px rgba(35, 134, 54, 0.4);
}

.btn-primary:hover {
  background-color: #2ea043;
  color: #ffffff;
  text-decoration: none;
  box-shadow: 0 0 20px rgba(35, 134, 54, 0.6);
}

.btn-outline {
  background-color: var(--bg-subtle);
  color: var(--fg-default);
  border-color: var(--border-default);
}

.btn-outline:hover {
  background-color: var(--bg-muted);
  border-color: var(--fg-subtle);
  text-decoration: none;
}

/* Hero Section */
.hero {
  padding: 60px 0 40px;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 9999px;
  font-size: 0.82rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-bottom: 24px;
  max-width: 100%;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-title {
  font-size: clamp(2.2rem, 5.5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  background: linear-gradient(180deg, #ffffff 40%, #8b949e 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--fg-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

/* Hero CTA & Quick Install Box */
.install-box {
  max-width: 640px;
  width: 100%;
  margin: 0 auto 48px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card), var(--glow-blue);
}

.install-tabs {
  display: flex;
  flex-wrap: wrap;
  background-color: var(--bg-inset);
  border-bottom: 1px solid var(--border-muted);
  padding: 6px 8px;
  gap: 4px;
}

.install-tab {
  padding: 8px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--fg-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.install-tab.active {
  color: var(--fg-default);
  background-color: var(--bg-subtle);
}

.install-tab:hover:not(.active) {
  color: var(--fg-default);
}

.install-body {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  background-color: var(--bg-subtle);
}

.install-code {
  color: var(--accent-cyan);
  word-break: break-all;
  white-space: pre-wrap;
  text-align: left;
  flex: 1;
  min-width: 0;
}

.copy-btn {
  background: var(--bg-muted);
  border: 1px solid var(--border-default);
  color: var(--fg-default);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
  flex-shrink: 0;
}

.copy-btn:hover {
  background: var(--border-default);
  border-color: var(--fg-subtle);
}

.copy-btn.copied {
  background: #238636;
  border-color: #2ea043;
  color: #fff;
}

@media (max-width: 600px) {
  .install-tabs {
    display: grid;
    grid-template-columns: 1fr;
  }
  .install-tab {
    justify-content: center;
  }
  .install-body {
    flex-direction: column;
    align-items: stretch;
    padding: 14px 16px;
    gap: 12px;
  }
  .copy-btn {
    width: 100%;
    justify-content: center;
    padding: 8px 12px;
  }
}

/* Terminal Preview Component */
.terminal-window {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  background-color: var(--bg-inset);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  text-align: left;
}

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-muted);
}

.terminal-dots {
  display: flex;
  gap: 8px;
}

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

.dot-red { background-color: #ff5f56; }
.dot-yellow { background-color: #ffbd2e; }
.dot-green { background-color: #27c93f; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
}

.terminal-content {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--fg-default);
  min-height: 280px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.t-prompt { color: var(--accent-green); font-weight: bold; }
.t-cmd { color: #ffffff; font-weight: 600; }
.t-dim { color: var(--fg-subtle); }
.t-cyan { color: var(--accent-cyan); }
.t-green { color: var(--accent-green); }
.t-yellow { color: var(--accent-yellow); }
.t-purple { color: var(--accent-purple); }
.t-magenta { color: #f472b6; }
.t-red { color: var(--accent-red); }

/* Problem & Solution Comparison */
.section {
  padding: 70px 0;
  border-top: 1px solid var(--border-muted);
}

.section-tag {
  color: var(--accent-primary);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--fg-muted);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  max-width: 680px;
  margin-bottom: 40px;
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.comp-card {
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-default);
  background-color: var(--bg-subtle);
}

.comp-card.bad {
  border-color: rgba(248, 81, 73, 0.3);
  background: linear-gradient(180deg, rgba(248, 81, 73, 0.04) 0%, var(--bg-subtle) 100%);
}

.comp-card.good {
  border-color: rgba(63, 185, 80, 0.4);
  background: linear-gradient(180deg, rgba(63, 185, 80, 0.05) 0%, var(--bg-subtle) 100%);
  box-shadow: 0 0 30px rgba(63, 185, 80, 0.1);
}

.comp-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.comp-card.bad .comp-badge {
  background-color: rgba(248, 81, 73, 0.15);
  color: var(--accent-red);
}

.comp-card.good .comp-badge {
  background-color: rgba(63, 185, 80, 0.15);
  color: var(--accent-green);
}

.comp-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 0.95rem;
}

.comp-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

/* Ecosystems Explorer */
.eco-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding: 4px 4px 12px 4px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-muted);
}

.eco-tabs::-webkit-scrollbar {
  height: 5px;
}

.eco-tabs::-webkit-scrollbar-track {
  background: var(--bg-subtle);
  border-radius: 4px;
}

.eco-tabs::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 4px;
}

.eco-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--fg-muted);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.2s;
}

.eco-btn:hover {
  background-color: var(--bg-muted);
  color: var(--fg-default);
}

.eco-btn.active {
  background-color: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 0 16px rgba(47, 129, 247, 0.4);
}

.eco-panel {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 24px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-card);
}

.eco-info h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.eco-info p {
  color: var(--fg-muted);
  margin-bottom: 24px;
  font-size: 0.98rem;
  line-height: 1.6;
}

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

.eco-feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--fg-default);
}

.eco-code-block {
  background-color: var(--bg-inset);
  border: 1px solid var(--border-muted);
  border-radius: var(--radius-lg);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-card), 0 0 20px rgba(47, 129, 247, 0.15);
}

.feature-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.feature-card h4 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Interactive TUI Simulator */
.tui-sim-container {
  background: var(--bg-inset);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card), var(--glow-purple);
}

.tui-nav-bar {
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-muted);
  padding: 10px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  flex-wrap: wrap;
  gap: 8px;
}

.tui-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: 380px;
}

.tui-left-col {
  border-right: 1px solid var(--border-muted);
  display: flex;
  flex-direction: column;
}

.tui-panel-header {
  padding: 8px 14px;
  background-color: rgba(22, 27, 34, 0.7);
  border-bottom: 1px solid var(--border-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-cyan);
  font-weight: 700;
}

.tui-links-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

.tui-link-item {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
  transition: background 0.15s;
}

.tui-link-item:hover, .tui-link-item.selected {
  background-color: var(--bg-muted);
}

.tui-link-item.selected {
  border-left: 3px solid var(--accent-cyan);
}

.tui-inspector {
  height: 140px;
  border-top: 1px solid var(--border-muted);
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background-color: rgba(13, 17, 23, 0.9);
  color: var(--fg-muted);
  overflow-y: auto;
}

.tui-logs-col {
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tui-footer {
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-muted);
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  color: var(--fg-subtle);
}

.tui-key {
  color: var(--accent-cyan);
  font-weight: bold;
}

/* Docs Callout Card (Featured Big Banner) */
.docs-callout-card {
  background: linear-gradient(135deg, rgba(47, 129, 247, 0.15), rgba(188, 140, 255, 0.1));
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.docs-callout-text h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.docs-callout-text p {
  color: var(--fg-muted);
  margin: 0;
  font-size: 1rem;
}

.docs-callout-btn {
  padding: 12px 24px;
  font-size: 0.98rem;
  flex-shrink: 0;
  white-space: nowrap;
}

/* CLI Table / Reference Explorer */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-default);
}

.cli-search {
  width: 100%;
  max-width: 400px;
  padding: 10px 16px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--fg-default);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-bottom: 24px;
  outline: none;
}

.cli-search:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 12px rgba(47, 129, 247, 0.3);
}

.cli-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  background-color: var(--bg-subtle);
}

.cli-table th {
  padding: 14px 20px;
  background-color: var(--bg-muted);
  border-bottom: 1px solid var(--border-default);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--fg-muted);
  white-space: nowrap;
}

.cli-table td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-muted);
  font-size: 0.92rem;
}

.cli-table tr:last-child td {
  border-bottom: none;
}

.cli-table code {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  background-color: var(--bg-inset);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  word-break: break-all;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px 24px;
  margin-bottom: 20px;
  list-style: none;
}

/* Responsive Breakpoints */
@media (max-width: 860px) {
  .comparison-grid, .eco-panel {
    grid-template-columns: 1fr;
    padding: 24px 18px;
  }
  .tui-grid {
    grid-template-columns: 1fr;
    height: auto;
  }
  .tui-left-col {
    border-right: none;
    border-bottom: 1px solid var(--border-muted);
  }
  .tui-links-list {
    max-height: 220px;
  }
  .tui-logs-col {
    max-height: 220px;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 50px 0;
  }
  .comp-card {
    padding: 22px 20px;
  }
  .feature-card {
    padding: 22px 20px;
  }
  .eco-panel {
    padding: 24px 20px;
  }
  .install-box {
    margin: 0 2px;
  }
  .docs-callout-card {
    padding: 28px 22px;
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
  .docs-callout-btn {
    width: 100%;
    justify-content: center;
  }
}