/* ── Custom Properties ── */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Menlo, Consolas, "DejaVu Sans Mono", monospace;

  /* Dark mode (default) */
  --bg-primary: #0a0e14;
  --bg-secondary: #111822;
  --bg-tertiary: #1a2230;
  --bg-card: #141c28;
  --bg-terminal: #0c1018;
  --text-primary: #d4dae4;
  --text-secondary: #8b95a5;
  --text-muted: #5a6575;
  --accent-green: #3ddc84;
  --accent-cyan: #56d4e0;
  --accent-blue: #4fa4f7;
  --accent-yellow: #f0c674;
  --accent-red: #e06c75;
  --accent-purple: #c792ea;
  --border-color: #1e2a3a;
  --border-subtle: #162030;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.6);
  --terminal-prompt: #3ddc84;
  --terminal-command: #d4dae4;
  --terminal-output: #8b95a5;
  --terminal-comment: #5a6575;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ebeef2;
    --bg-tertiary: #e0e4ea;
    --bg-card: #ffffff;
    --bg-terminal: #1e2530;
    --text-primary: #1a2030;
    --text-secondary: #4a5568;
    --text-muted: #8b95a5;
    --accent-green: #22a55a;
    --accent-cyan: #1498a6;
    --accent-blue: #2d7dd2;
    --accent-yellow: #c09020;
    --accent-red: #c0392b;
    --accent-purple: #7c3aed;
    --border-color: #d0d6e0;
    --border-subtle: #e0e4ea;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.12);
    --terminal-prompt: #3ddc84;
    --terminal-command: #e0e4ea;
    --terminal-output: #a0aab5;
    --terminal-comment: #6a7585;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--accent-green);
}

img {
  max-width: 100%;
  display: block;
}

/* ── Layout ── */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 5rem 0;
}

section + section {
  border-top: 1px solid var(--border-subtle);
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 0;
}

@media (prefers-color-scheme: light) {
  .nav {
    background: rgba(245, 247, 250, 0.85);
  }
}

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

.nav-brand {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ── Hero ── */
.hero {
  padding: 8rem 0 5rem;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-green);
  background: rgba(61, 220, 132, 0.1);
  border: 1px solid rgba(61, 220, 132, 0.2);
  border-radius: 999px;
  padding: 0.35rem 1rem;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero h1 .accent {
  background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all 0.2s;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-green);
  color: #0a0e14;
}

.btn-primary:hover {
  background: #4de894;
  color: #0a0e14;
  box-shadow: 0 0 24px rgba(61, 220, 132, 0.3);
}

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

.btn-secondary:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* ── Terminal Mockup ── */
.terminal {
  background: var(--bg-terminal);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  max-width: 680px;
  margin: 0 auto;
  text-align: left;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-color);
}

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

.terminal-dot.red { background: #e06c75; }
.terminal-dot.yellow { background: #e5c07b; }
.terminal-dot.green { background: #3ddc84; }

.terminal-title {
  flex: 1;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.terminal-body {
  padding: 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.8;
  overflow-x: auto;
}

.terminal-body .prompt {
  color: var(--terminal-prompt);
}

.terminal-body .command {
  color: var(--terminal-command);
}

.terminal-body .output {
  color: var(--terminal-output);
}

.terminal-body .comment {
  color: var(--terminal-comment);
}

.terminal-body .highlight {
  color: var(--accent-cyan);
}

.terminal-body .success {
  color: var(--accent-green);
}

.terminal-body .warning {
  color: var(--accent-yellow);
}

/* ── Section Headers ── */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-desc {
  color: var(--text-secondary);
  max-width: 600px;
  font-size: 1.0625rem;
  line-height: 1.7;
}

.section-header {
  margin-bottom: 3rem;
}

.section-header.center {
  text-align: center;
}

.section-header.center .section-desc {
  margin-left: auto;
  margin-right: auto;
}

/* ── How It Works (Pipeline) ── */
.pipeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
}

.pipeline-step {
  text-align: center;
  position: relative;
}

.pipeline-step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 2.25rem;
  right: -1rem;
  width: 2rem;
  height: 2px;
  background: var(--border-color);
}

.pipeline-icon {
  width: 4.5rem;
  height: 4.5rem;
  margin: 0 auto 1.25rem;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.pipeline-step:nth-child(1) .pipeline-icon {
  color: var(--accent-blue);
  border-color: rgba(79, 164, 247, 0.2);
  background: rgba(79, 164, 247, 0.06);
}

.pipeline-step:nth-child(2) .pipeline-icon {
  color: var(--accent-purple);
  border-color: rgba(199, 146, 234, 0.2);
  background: rgba(199, 146, 234, 0.06);
}

.pipeline-step:nth-child(3) .pipeline-icon {
  color: var(--accent-green);
  border-color: rgba(61, 220, 132, 0.2);
  background: rgba(61, 220, 132, 0.06);
}

.pipeline-step h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.pipeline-step p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Feature Grid ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.75rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 32px rgba(86, 212, 224, 0.06);
}

.feature-icon {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: rgba(86, 212, 224, 0.08);
  color: var(--accent-cyan);
}

.feature-card:nth-child(1) .feature-icon { color: var(--accent-green); background: rgba(61, 220, 132, 0.08); }
.feature-card:nth-child(2) .feature-icon { color: var(--accent-blue); background: rgba(79, 164, 247, 0.08); }
.feature-card:nth-child(3) .feature-icon { color: var(--accent-purple); background: rgba(199, 146, 234, 0.08); }
.feature-card:nth-child(4) .feature-icon { color: var(--accent-yellow); background: rgba(240, 198, 116, 0.08); }
.feature-card:nth-child(5) .feature-icon { color: var(--accent-red); background: rgba(224, 108, 117, 0.08); }
.feature-card:nth-child(6) .feature-icon { color: var(--accent-cyan); background: rgba(86, 212, 224, 0.08); }

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Security Section ── */
.security-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.security-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
}

.security-marker {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 700;
  background: rgba(61, 220, 132, 0.1);
  color: var(--accent-green);
  border: 1px solid rgba(61, 220, 132, 0.2);
}

.security-item h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.security-item p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Install Section ── */
.install-block {
  max-width: 640px;
  margin: 0 auto;
}

.install-block .terminal {
  max-width: 100%;
}

.install-tabs {
  display: flex;
  gap: 0;
  margin-bottom: -1px;
  position: relative;
  z-index: 1;
}

.install-tab {
  padding: 0.5rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  cursor: default;
}

.install-tab.active {
  color: var(--text-primary);
  background: var(--bg-terminal);
  border-color: var(--border-color);
}

.install-note {
  text-align: center;
  margin-top: 1.5rem;
  opacity: 0.7;
}

/* ── Comparison Table ── */
.comparison-wrap {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.comparison-table th,
.comparison-table td {
  padding: 0.875rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.comparison-table thead th {
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg-secondary);
}

.comparison-table thead th:first-child {
  border-radius: 8px 0 0 0;
}

.comparison-table thead th:last-child {
  border-radius: 0 8px 0 0;
}

.comparison-table tbody tr {
  transition: background 0.15s;
}

.comparison-table tbody tr:hover {
  background: var(--bg-secondary);
}

.comparison-table tbody td:first-child {
  color: var(--text-secondary);
  font-weight: 500;
}

.comparison-table .check {
  color: var(--accent-green);
  font-weight: 700;
}

.comparison-table .cross {
  color: var(--text-muted);
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2.5rem 0;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.8125rem;
  color: var(--text-muted);
  transition: color 0.2s;
}

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

/* ── Responsive ── */
@media (max-width: 768px) {
  .hero {
    padding: 6rem 0 3rem;
  }

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

  .hero-tagline {
    font-size: 1.0625rem;
  }

  section {
    padding: 3.5rem 0;
  }

  .pipeline {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .pipeline-step:not(:last-child)::after {
    display: none;
  }

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

  .security-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.625rem;
  }

  .nav-links {
    display: none;
  }

  .footer .container {
    flex-direction: column;
    text-align: center;
  }

  .terminal-body {
    font-size: 0.75rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}