/* BridgeSessions public site — dark technical mesh aesthetic */

:root {
  --bg: #0b0d10;
  --bg-elev: #11141b;
  --bg-card: #1a1d24;
  --border: #2a2e38;
  --text: #f5f7fa;
  --text-muted: #9aa3b2;
  --accent: #00e5ff;
  --accent-dim: #00a8bb;
  --danger: #ff4d6d;
  --success: #00f5a0;
  --warning: #ffcc00;
  --max-width: 1120px;
  --radius: 0;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.mono, code, pre, kbd, .tagline, .nav-logo span {
  font-family: "Geist Mono", "SF Mono", "Fira Code", ui-monospace, monospace;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

a:hover, a:focus {
  border-bottom-color: var(--accent);
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 100;
}

.skip-link:focus {
  position: fixed;
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  padding: 0.5rem 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--accent);
  color: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 13, 16, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  border-bottom: none;
}

.nav-logo:hover, .nav-logo:focus {
  color: var(--accent);
  border-bottom: none;
}

.logo-mark {
  width: 32px;
  height: 32px;
  border: 2px solid var(--accent);
  display: grid;
  place-items: center;
  color: var(--accent);
  font-size: 1rem;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.92rem;
}

.nav-links a {
  color: var(--text-muted);
  border-bottom: none;
}

.nav-links a:hover, .nav-links a[aria-current="page"] {
  color: var(--text);
}

.nav-links a[aria-current="page"] {
  border-bottom: 1px solid var(--accent);
}

.nav-cta {
  display: flex;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
  text-decoration: none;
}

.btn:hover, .btn:focus {
  background: var(--bg-elev);
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

.btn-primary:hover, .btn-primary:focus {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  color: var(--bg);
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.45rem 0.7rem;
  font-size: 1.1rem;
  cursor: pointer;
}

main {
  min-height: calc(100vh - 64px - 180px);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero {
  padding: 5rem 0 4rem;
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.05;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.hero h1 em {
  color: var(--accent);
  font-style: normal;
}

.tagline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-muted);
  margin: 0 0 1.5rem;
  line-height: 1.5;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.hero-meta span {
  font-size: 0.8rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-visual {
  border: 1px solid var(--border);
  background: var(--bg-card);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.hero-visual pre {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-muted);
  overflow-x: auto;
}

.hero-visual .prompt {
  color: var(--accent);
}

.hero-visual .cmd {
  color: var(--text);
}

.hero-visual .comment {
  color: #6b7280;
}

.section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border);
}

.section:last-child {
  border-bottom: none;
}

.section-title {
  font-size: 1.75rem;
  margin: 0 0 0.5rem;
}

.section-lead {
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 0 2rem;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.pillar {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.5rem;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.pillar:hover {
  border-color: var(--accent-dim);
  transform: translateY(-3px);
}

.pillar-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
}

.pillar h3 {
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
}

.pillar p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.demo {
  background: var(--bg-elev);
}

.demo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.demo figure {
  margin: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.demo figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.demo img, .demo video {
  width: 100%;
}

.panel-preview {
  display: grid;
  gap: 1.5rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.docs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.doc-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.25rem;
  color: var(--text);
}

.doc-card:hover, .doc-card:focus {
  border-color: var(--accent);
}

.doc-card h3 {
  font-size: 1rem;
  margin: 0 0 0.35rem;
  color: var(--accent);
}

.doc-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.architecture-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.architecture-diagram pre {
  margin: 0;
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--text-muted);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.download-card h3 {
  margin: 0;
  font-size: 1.1rem;
}

.download-card code {
  font-size: 0.85rem;
  background: var(--bg);
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--border);
  color: var(--accent);
}

.download-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.license-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2rem;
  margin: 1.5rem 0;
}

.license-box h3 {
  margin-top: 0;
  color: var(--accent);
}

.license-box ul {
  padding-left: 1.25rem;
  color: var(--text-muted);
}

.license-box li {
  margin-bottom: 0.5rem;
}

.security-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.security-list li {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.25rem;
}

.security-list h3 {
  margin: 0 0 0.35rem;
  color: var(--accent);
  font-size: 1rem;
}

.security-list p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 2.5rem 0;
  margin-top: 0;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 2rem;
}

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

.footer-brand span {
  color: var(--accent);
}

.footer-col p, .footer-col a {
  font-size: 0.88rem;
  color: var(--text-muted);
}

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

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.35rem;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 2rem auto 0;
  padding: 1.5rem 1.5rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

@media (max-width: 900px) {
  .hero-grid, .demo-grid, .footer-inner {
    grid-template-columns: 1fr;
  }

  .pillars, .docs-grid, .download-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links, .nav-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .site-header.nav-open .nav-links,
  .site-header.nav-open .nav-cta {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.75rem;
  }

  .site-header.nav-open .nav-cta {
    top: auto;
    position: relative;
    border-bottom: none;
    padding-top: 0;
  }

  .pillars, .docs-grid, .download-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 3rem 0;
  }

  .section {
    padding: 2.5rem 0;
  }
}