/* GoBubble marketing site
   Self-contained, dependency-free CSS. Dark theme echoing the app's own
   colour language (dark navy-grey chrome, cyan accents). */

:root {
  --bg: #14181c;
  --bg-alt: #1a1f25;
  --panel: #1e242b;
  --panel-border: #2c343d;
  --text: #eef2f5;
  --text-dim: #9aa7b2;
  --text-dimmer: #6b7680;
  --accent: #4fd8e0;
  --accent-2: #7c9cff;
  --accent-amber: #f5a623;
  --accent-contrast: #06232a;
  --radius: 12px;
  --wrap: 1140px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Menlo", "Cascadia Code", monospace;
}

:root[data-theme="light"] {
  --bg: #f5f3ee;
  --bg-alt: #ebe8e0;
  --panel: #ffffff;
  --panel-border: #ddd8cc;
  --text: #1c1f22;
  --text-dim: #565f66;
  --text-dimmer: #82898f;
  --accent: #0c8a92;
  --accent-2: #3757c9;
  --accent-amber: #b56a00;
  --accent-contrast: #04181a;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f5f3ee;
    --bg-alt: #ebe8e0;
    --panel: #ffffff;
    --panel-border: #ddd8cc;
    --text: #1c1f22;
    --text-dim: #565f66;
    --text-dimmer: #82898f;
    --accent: #0c8a92;
    --accent-2: #3757c9;
    --accent-amber: #b56a00;
    --accent-contrast: #04181a;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.2s ease, color 0.2s ease;
}

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

a { color: inherit; }

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-contrast);
}
.btn-primary:hover { filter: brightness(1.06); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--panel-border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-small { padding: 9px 18px; font-size: 14px; }
.btn-large { padding: 16px 28px; font-size: 16px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(20, 24, 28, 0.85);
  backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--panel-border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
  color: var(--text);
  margin-right: auto;
}
.brand img { border-radius: 8px; }

.site-nav {
  display: flex;
  gap: 28px;
}
.site-nav a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 14.5px;
  font-weight: 500;
  transition: color 0.15s ease;
}
.site-nav a:hover { color: var(--text); }

.header-cta { flex-shrink: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 18px;
  margin: 0 auto;
  background: var(--text);
}

/* ---------- Hero ---------- */
.hero {
  padding: 76px 0 40px;
  background:
    radial-gradient(1000px 500px at 15% -10%, rgba(79, 216, 224, 0.14), transparent 60%),
    radial-gradient(800px 500px at 100% 0%, rgba(124, 156, 255, 0.10), transparent 60%);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-copy, .hero-art { min-width: 0; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-amber);
  margin: 0 0 16px;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-amber);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-amber) 25%, transparent);
}

.hero h1 {
  font-size: 46px;
  line-height: 1.08;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.lede {
  font-size: 17px;
  color: var(--text-dim);
  max-width: 46ch;
  margin: 0 0 30px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.hero-fineprint {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.01em;
  color: var(--text-dimmer);
  margin: 0;
}

.hero-art img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--panel-border);
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, 0.6);
}

/* ---------- Strip ---------- */
.strip {
  border-top: 1px solid var(--panel-border);
  border-bottom: 1px solid var(--panel-border);
  background: var(--bg-alt);
}
.strip-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 40px;
  justify-content: space-between;
  padding: 22px 24px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-dimmer);
  letter-spacing: 0.02em;
}

/* ---------- Sections ---------- */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }

.section h2 {
  font-size: 32px;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.section-lede {
  font-size: 16px;
  color: var(--text-dim);
  max-width: 62ch;
  margin: 0 0 48px;
}

/* ---------- Feature grid ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 26px 22px;
}

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(79, 216, 224, 0.12);
  color: var(--accent);
  font-size: 18px;
  margin-bottom: 16px;
}

.feature h3 {
  font-size: 16.5px;
  margin: 0 0 8px;
}

.feature p {
  font-size: 14.5px;
  color: var(--text-dim);
  margin: 0;
}

/* ---------- Showcase ---------- */
.showcase {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.showcase-item:first-child { grid-column: 1 / -1; }

.showcase-item img {
  border-radius: var(--radius);
  border: 1px solid var(--panel-border);
}

.showcase-item figcaption {
  font-size: 14px;
  color: var(--text-dim);
  margin-top: 12px;
}
.showcase-item figcaption strong { color: var(--text); }

/* ---------- Who grid ---------- */
.who-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.who-card {
  padding: 24px 0 0;
  border-top: 2px solid var(--accent);
}
.who-card h3 {
  font-size: 16px;
  margin: 0 0 8px;
}
.who-card p {
  font-size: 14.5px;
  color: var(--text-dim);
  margin: 0;
}

/* ---------- CTA ---------- */
.section-cta {
  text-align: center;
  background:
    radial-gradient(700px 380px at 50% 0%, rgba(79, 216, 224, 0.12), transparent 65%),
    var(--bg-alt);
  border-top: 1px solid var(--panel-border);
}
.cta-inner { max-width: 720px; }
.section-cta .section-lede { margin-left: auto; margin-right: auto; }

.cta-box {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.requirements {
  list-style: none;
  display: flex;
  gap: 28px;
  justify-content: center;
  flex-wrap: wrap;
  padding: 24px 0 0;
  margin: 0;
  border-top: 1px solid var(--panel-border);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-dim);
}
.requirements strong {
  font-family: var(--font-body);
  color: var(--text);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--panel-border);
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  color: var(--text-dimmer);
  font-size: 13.5px;
}
.footer-inner .brand {
  font-size: 15px;
  margin-right: 12px;
}
.footer-inner p { margin: 0; }
.footer-nav { display: flex; gap: 18px; }
.footer-nav a { text-decoration: none; color: var(--text-dim); }
.footer-nav a:hover { color: var(--accent); }
.footer-copyright {
  margin-left: auto !important;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .who-grid { grid-template-columns: repeat(2, 1fr); }
  .showcase { grid-template-columns: 1fr; }
  .showcase-item:first-child { grid-column: auto; }
}

@media (max-width: 720px) {
  .site-nav { display: none; }
  .header-cta { display: none; }
  .nav-toggle { display: flex; }

  .site-header.nav-open .site-nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--panel-border);
    padding: 16px 24px 24px;
    gap: 16px;
  }
  .site-header.nav-open .header-cta {
    display: inline-flex;
    position: absolute;
    top: 92px;
    right: 24px;
  }

  .hero { padding: 48px 0 32px; }
  .hero h1 { font-size: 34px; }
  .section { padding: 60px 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .who-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-copyright { margin-left: 0 !important; }
}