/* ============================================
   KubeCopilot Website — CSS
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #0a0e1a;
  --color-bg-alt: #0f1525;
  --color-bg-card: #151b2e;
  --color-bg-card-hover: #1a2240;
  --color-text: #e0e6f0;
  --color-text-muted: #8892a8;
  --color-primary: #00bcd4;
  --color-primary-light: #26c6da;
  --color-primary-dark: #0097a7;
  --color-accent: #e94560;
  --color-accent-light: #ff6b81;
  --color-yellow: #ffc107;
  --color-border: #1e2742;
  --color-code-bg: #0d1117;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --transition: 0.25s ease;
  --container-max: 1200px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-light);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--color-primary-light);
}

/* --- Section titles --- */
.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.125rem;
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.nav-logo:hover {
  color: var(--color-primary);
}

.logo-icon {
  font-size: 1.5rem;
  color: var(--color-primary);
}

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

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.nav-github {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg-card);
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
}

.nav-github:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-primary);
  color: var(--color-primary) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding: 160px 0 100px;
  text-align: center;
  overflow: hidden;
}

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

.hero-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 4px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 720px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 188, 212, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(0, 188, 212, 0.45);
  color: #fff;
}

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(0, 188, 212, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

/* ============================================
   Features
   ============================================ */
.features {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

.feature-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

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

/* ============================================
   Architecture
   ============================================ */
.architecture {
  padding: 100px 0;
}

.arch-diagram {
  max-width: 800px;
  margin: 0 auto;
}

.arch-layer {
  margin-bottom: 8px;
}

.arch-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  text-align: center;
}

.arch-items {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.arch-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 16px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  min-width: 160px;
  text-align: center;
  transition: all var(--transition);
}

.arch-box:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.arch-box-icon {
  font-size: 1.25rem;
}

.arch-box span {
  font-weight: 600;
  font-size: 0.9rem;
}

.arch-box small {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.arch-ui {
  background: rgba(0, 188, 212, 0.08);
  border-color: rgba(0, 188, 212, 0.25);
}

.arch-backend {
  background: rgba(0, 188, 212, 0.05);
  border-color: rgba(0, 188, 212, 0.2);
}

.arch-operator {
  background: rgba(15, 52, 96, 0.3);
  border-color: rgba(0, 188, 212, 0.2);
}

.arch-agent {
  background: rgba(233, 69, 96, 0.08);
  border-color: rgba(233, 69, 96, 0.25);
}

.arch-crd {
  background: rgba(255, 193, 7, 0.08);
  border-color: rgba(255, 193, 7, 0.25);
}

.arch-arrow {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 1.25rem;
  padding: 8px 0;
}

/* ============================================
   Quick Start
   ============================================ */
.quickstart {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.steps {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.step-content pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.6;
}

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

.quickstart-note {
  max-width: 800px;
  margin: 32px auto 0;
  padding: 16px 20px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-yellow);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ============================================
   Screenshots
   ============================================ */
.screenshots {
  padding: 100px 0;
}

.screenshot-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 20px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

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

.tab-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.screenshot-display {
  max-width: 960px;
  margin: 0 auto;
}

.screenshot-frame {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 8px;
  box-shadow: var(--shadow-lg);
}

.screenshot-frame img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  display: block;
}

/* ============================================
   Documentation
   ============================================ */
.docs {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.docs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.doc-card {
  display: block;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  color: var(--color-text);
}

.doc-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  color: var(--color-text);
}

.doc-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.doc-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.doc-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================================
   CRDs Table
   ============================================ */
.crds {
  padding: 100px 0;
}

.crd-table-wrapper {
  max-width: 800px;
  margin: 0 auto;
  overflow-x: auto;
}

.crd-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.crd-table thead {
  background: var(--color-bg-card);
}

.crd-table th {
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.crd-table td {
  padding: 14px 20px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--color-border);
}

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

.crd-table tr:hover {
  background: var(--color-bg-card);
}

/* ============================================
   Contact
   ============================================ */
.contact {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.contact-card {
  display: block;
  text-align: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px 24px;
  transition: all var(--transition);
  color: var(--color-text);
}

.contact-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  color: var(--color-text);
}

.contact-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.contact-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.contact-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .features-grid,
  .docs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10, 14, 26, 0.98);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    gap: 16px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 120px 0 60px;
  }

  .hero h1 {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .features-grid,
  .docs-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 2rem;
  }

  .step {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

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

  .arch-box {
    width: 100%;
    max-width: 260px;
  }

  .screenshot-tabs {
    gap: 6px;
  }

  .tab-btn {
    padding: 8px 14px;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
    max-width: 280px;
  }
}