/* === Fonts === */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

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

/* === Design Tokens === */
:root {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-card: #1E293B;
  --bg-card-hover: #243247;
  --border: #334155;
  --border-hover: #475569;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #8494A7;
  --accent: #58A6FF;
  --accent-hover: #79C0FF;
  --green: #22C55E;
  --green-dim: rgba(34, 197, 94, 0.15);
  --green-glow: rgba(34, 197, 94, 0.3);
  --yellow: #EAB308;
  --code-bg: #0F172A;
  --terminal-bg: #0C1222;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', Consolas, monospace;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1000px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: 200ms ease;
}

/* === Skip Link === */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  background: var(--green);
  color: var(--bg-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  text-decoration: none;
  transition: top var(--transition);
}
.skip-link:focus {
  top: 1rem;
}

/* === Focus Visible === */
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
}
:focus:not(:focus-visible) {
  outline: none;
}

/* === Base === */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

code {
  font-family: var(--font-mono);
}

/* === Layout === */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  width: 100%;
}

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0.875rem 0;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-header .logo {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: opacity var(--transition);
}
.site-header .logo:hover {
  opacity: 0.8;
}
.site-header .logo span {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.85rem;
}
.header-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.header-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}
.header-links a:hover {
  color: var(--text-primary);
}
.lang-switch {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font-sans);
  font-weight: 500;
  transition: all var(--transition);
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.lang-switch:hover {
  border-color: var(--green);
  color: var(--green);
}

/* === Hero === */
.hero {
  text-align: center;
  padding: 6rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  max-width: 100vw;
  height: 400px;
  background: radial-gradient(ellipse, var(--green-dim) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.hero .container {
  position: relative;
  z-index: 1;
}
.hero h1 {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--green) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

/* === Terminal Install Box === */
.install-box {
  background: var(--terminal-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  max-width: 640px;
  margin: 0 auto;
  overflow: hidden;
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.terminal-dot.red { background: #FF5F57; }
.terminal-dot.yellow { background: #FEBC2E; }
.terminal-dot.green { background: #28C840; }
.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.5rem;
}
.install-command {
  display: flex;
  align-items: center;
  padding: 1rem 1.25rem;
  gap: 0.75rem;
}
.install-command .prompt {
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  user-select: none;
  flex-shrink: 0;
}
.install-command code {
  font-size: 0.9rem;
  color: var(--text-primary);
  flex: 1;
  white-space: nowrap;
  overflow-x: auto;
}
.install-command .copy-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-height: 44px;
}
.install-command .copy-btn:hover {
  border-color: var(--green);
  color: var(--green);
}
.install-command .copy-btn.copied {
  border-color: var(--green);
  color: var(--green);
  background: var(--green-dim);
}
.install-command .copy-btn svg {
  width: 14px;
  height: 14px;
}
.install-alt {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.625rem 1.25rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

/* === Features === */
.features {
  padding: 5rem 0;
}
.features h2 {
  font-family: var(--font-mono);
  text-align: center;
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2.5rem;
  color: var(--text-primary);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: all var(--transition);
  cursor: default;
}
.feature-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}
.feature-card .icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  background: var(--green-dim);
  color: var(--green);
}
.feature-card .icon svg {
  width: 20px;
  height: 20px;
}
.feature-card h3 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* === Workflow === */
.workflow {
  padding: 3rem 0 5rem;
}
.workflow h2 {
  font-family: var(--font-mono);
  text-align: center;
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
}
.workflow-steps {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  max-width: 600px;
  margin: 0 auto;
}
.workflow-step {
  display: flex;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  gap: 1.25rem;
  transition: background var(--transition);
}
.workflow-step:last-child {
  border-bottom: none;
}
.workflow-step:hover {
  background: rgba(34, 197, 94, 0.04);
}
.workflow-step .step-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--green);
  background: var(--green-dim);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  flex-shrink: 0;
}
.workflow-step .step-cmd {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--green);
  min-width: 140px;
  flex-shrink: 0;
}
.workflow-step .step-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* === Requirements === */
.requirements {
  padding: 2rem 0 5rem;
}
.requirements h2 {
  font-family: var(--font-mono);
  text-align: center;
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
}
.req-table {
  max-width: 560px;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.req-row {
  display: flex;
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  gap: 1.5rem;
  align-items: center;
}
.req-row:last-child {
  border-bottom: none;
}
.req-row .platform {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.875rem;
  min-width: 120px;
  color: var(--text-primary);
}
.req-row .deps {
  font-size: 0.875rem;
  color: var(--text-secondary);
}
.req-row .deps code {
  font-size: 0.8rem;
  background: rgba(88, 166, 255, 0.1);
  color: var(--accent);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  margin-right: 0.25rem;
}

/* === Footer === */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
}
.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}
.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  transition: color var(--transition);
}
.footer-links a:hover {
  color: var(--text-primary);
}
.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* === Responsive === */
@media (max-width: 768px) {
  .hero {
    padding: 4rem 0 3rem;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
  .hero .subtitle {
    font-size: 1rem;
  }
  .feature-grid {
    grid-template-columns: 1fr;
  }
  .install-command code {
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }
  .hero .subtitle {
    font-size: 0.9rem;
  }
  .workflow-step {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .workflow-step .step-cmd {
    min-width: auto;
  }
  .req-row {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
  .header-links {
    gap: 0.75rem;
  }
  .header-links a {
    font-size: 0.8rem;
  }
}

@media (max-width: 375px) {
  .site-header .container {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .site-header .logo {
    font-size: 0.9rem;
  }
  .site-header .logo span {
    font-size: 0.75rem;
  }
  .header-links {
    gap: 0.5rem;
  }
  .header-links a {
    font-size: 0.75rem;
  }
  .hero h1 {
    font-size: 1.5rem;
  }
  .hero {
    padding: 3rem 0 2rem;
  }
  .container {
    padding: 0 1rem;
  }
  .install-command {
    padding: 0.75rem 0.75rem;
    gap: 0.5rem;
  }
  .install-command code {
    font-size: 0.7rem;
  }
}