/* MelodyBridge landing page. Plain CSS, tokens in :root, dark mode via
   prefers-color-scheme. No dependencies, no build step.
   Palette follows the app itself: teal accent on near-black. */

:root {
  --primary: #0f766e;
  --primary-strong: #115e59;
  --primary-contrast: #ffffff;
  --primary-soft: rgba(15, 118, 110, 0.10);
  --accent: #2dd4bf;
  --bg: #ffffff;
  --bg-alt: #f4f6f8;
  --surface: #ffffff;
  --text: #0f172a;
  --text-soft: #3f4c5e;
  --muted: #7b8794;
  --border: #dce2ea;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 8px 24px rgba(15, 23, 42, 0.07);
  --radius: 10px;
  --code-bg: #0f1115;
  --code-text: #e6e9ef;
  --font: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI',
    Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #2dd4bf;
    --primary-strong: #14b8a6;
    --primary-contrast: #062a26;
    --primary-soft: rgba(45, 212, 191, 0.12);
    --accent: #2dd4bf;
    --bg: #0f1115;
    --bg-alt: #151923;
    --surface: #151923;
    --text: #f5f7fb;
    --text-soft: #9aa4b2;
    --muted: #6f7a89;
    --border: #2a3140;
    --shadow: 0 12px 28px rgba(0, 0, 0, 0.22);
    --code-bg: #0b0d12;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 680px; }

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

h1, h2, h3 { letter-spacing: -0.02em; line-height: 1.2; }
h1 { font-size: clamp(32px, 6vw, 54px); font-weight: 750; margin: 0 0 20px; }
h2 { font-size: clamp(24px, 4vw, 32px); font-weight: 700; margin: 0 0 12px; }
h3 { font-size: 17px; font-weight: 650; margin: 0 0 8px; }

.section > .container > h2,
.sponsor-section .container > h2 { margin-bottom: 40px; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--primary);
  color: var(--primary-contrast);
  padding: 8px 16px;
  border-radius: 0 0 8px 0;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* Header and nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
}
.brand-mark { width: 28px; height: 28px; color: var(--primary); }

.nav-links { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.nav-links a {
  color: var(--text-soft);
  font-weight: 550;
  font-size: 15px;
  padding: 8px 10px;
  border-radius: 8px;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.github,
.nav-links a.sponsor {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-weight: 600;
}
.nav-links a.github:hover { border-color: var(--primary); color: var(--primary); }
.nav-links a.sponsor {
  border-color: transparent;
  background: var(--primary-soft);
  color: var(--primary);
}
.nav-links a.sponsor:hover { color: var(--primary-strong); }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
}

/* Hero */
.hero {
  padding: 88px 0 64px;
  text-align: center;
  background:
    radial-gradient(600px 280px at 50% -60px,
      color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%);
}
.hero h1 { margin-bottom: 20px; }
.hero-sub {
  max-width: 620px;
  margin: 0 auto 32px;
  color: var(--text-soft);
  font-size: 18px;
}
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

/* Terminal card */
.terminal {
  margin: 0 auto;
  max-width: 620px;
  text-align: left;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.terminal-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 10px 14px;
  background: var(--code-bg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.dot { width: 11px; height: 11px; border-radius: 50%; background: #2a3140; }
.terminal-title {
  margin-left: 6px;
  color: #6f7a89;
  font-size: 12.5px;
  font-family: var(--mono);
}
.copy {
  margin-left: auto;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 6px;
  color: #9aa4b2;
  font-size: 12px;
  font-family: var(--mono);
  padding: 3px 10px;
  cursor: pointer;
}
.copy:hover { color: #e6e9ef; border-color: rgba(255, 255, 255, 0.3); }
.terminal-body {
  padding: 18px;
  background: var(--code-bg);
  font-family: var(--mono);
}
.terminal-body pre { margin: 0 0 10px; }
.terminal-body pre:last-child { margin-bottom: 0; }
.terminal-body code {
  color: var(--code-text);
  font-size: 14px;
  background: none;
  white-space: pre-wrap;
  word-break: break-all;
}
.prompt { color: #2dd4bf; margin-right: 8px; }
.out { color: #7dd3c8; opacity: 0.85; }

.hero-note {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 14px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 15px;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn.primary { background: var(--primary); color: var(--primary-contrast); }
.btn.primary:hover { background: var(--primary-strong); color: var(--primary-contrast); }
.btn.secondary { border-color: var(--border); color: var(--text); }
.btn.secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn:focus-visible,
.nav-toggle:focus-visible,
.skip-link:focus-visible,
.copy:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Sections */
.section { padding: 72px 0; }
.section.alt { background: var(--bg-alt); }

/* Steps */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.step {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 16px;
}
.step p { margin: 0; color: var(--text-soft); font-size: 15px; }

/* Features */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.feature p { margin: 0; color: var(--text-soft); font-size: 15px; }
.icon {
  width: 32px;
  height: 32px;
  color: var(--primary);
  margin-bottom: 16px;
}

/* Prose section */
.section.narrow p { color: var(--text-soft); font-size: 16px; }
.section.narrow p:last-child { margin-bottom: 0; }

/* Sponsor section */
.sponsor-section { text-align: center; }
.sponsor-section .container { text-align: center; }
.sponsor-heart {
  width: 40px;
  height: 40px;
  color: var(--primary);
  margin-bottom: 8px;
}
.sponsor-section p {
  max-width: 520px;
  margin: 0 auto 28px;
  color: var(--text-soft);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--text-soft);
  font-size: 14px;
}
.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-row nav { display: flex; gap: 20px; }

/* Responsive */
@media (max-width: 860px) {
  .steps, .feature-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .steps, .feature-grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 0 40px; }

  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 16px 24px 24px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 16px; padding: 8px 0; }
  .nav-links a.github, .nav-links a.sponsor { padding: 8px 14px; }
}