:root {
  color-scheme: light dark;
  --bg: #07111f;
  --panel: rgba(15, 30, 50, 0.82);
  --panel-strong: #10243b;
  --text: #f3f7fb;
  --muted: #a9b9ca;
  --line: rgba(154, 184, 213, 0.18);
  --accent: #73e0d1;
  --accent-2: #87a7ff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 0%, rgba(69, 117, 217, 0.22), transparent 34rem),
    radial-gradient(circle at 92% 12%, rgba(48, 186, 168, 0.16), transparent 30rem),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

a { color: inherit; }

.shell {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: .01em;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(115, 224, 209, 0.55);
  border-radius: 11px;
  background: linear-gradient(145deg, rgba(115, 224, 209, .2), rgba(135, 167, 255, .18));
  color: var(--accent);
}

.header-link,
.back-link {
  color: var(--muted);
  text-decoration: none;
}

.header-link:hover,
.back-link:hover { color: var(--text); }

main { padding: 72px 0 96px; }

.hero {
  max-width: 780px;
  padding: 42px 0 58px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: .86rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.2; }

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 5rem);
  letter-spacing: -.045em;
}

.hero p,
.page-intro {
  max-width: 700px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.section-title {
  margin: 0 0 20px;
  font-size: 1.1rem;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}

.app-card,
.content-card {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.app-card {
  display: block;
  padding: 28px;
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease;
}

.app-card:hover {
  transform: translateY(-3px);
  border-color: rgba(115, 224, 209, .5);
}

.app-icon {
  display: grid;
  width: 58px;
  height: 58px;
  margin-bottom: 26px;
  place-items: center;
  border-radius: 18px;
  background: linear-gradient(145deg, #263f72, #143d42);
  color: var(--accent);
  font-size: 1.65rem;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.12);
}

.app-card h2 { margin: 0 0 8px; font-size: 1.35rem; }
.app-card p { margin: 0; color: var(--muted); }
.app-card .arrow { display: block; margin-top: 24px; color: var(--accent); }

.page-head { padding: 30px 0 36px; }
.page-head h1 { font-size: clamp(2.2rem, 6vw, 4rem); }

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 22px;
  align-items: start;
}

.content-card { padding: clamp(24px, 5vw, 48px); }
.content-card section + section { margin-top: 42px; padding-top: 36px; border-top: 1px solid var(--line); }
.content-card h2 { margin: 0 0 16px; font-size: 1.45rem; }
.content-card h3 { margin: 26px 0 8px; font-size: 1.05rem; }
.content-card p, .content-card li { color: #c7d3df; }
.content-card ul { padding-left: 1.3rem; }

.side-card {
  position: sticky;
  top: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(10, 24, 40, .8);
}

.side-card strong { display: block; margin-bottom: 12px; }
.side-card a { display: block; padding: 8px 0; color: var(--muted); text-decoration: none; }
.side-card a:hover { color: var(--accent); }

.contact {
  display: inline-flex;
  margin-top: 10px;
  padding: 11px 16px;
  border: 1px solid rgba(115, 224, 209, .45);
  border-radius: 12px;
  color: var(--accent);
  text-decoration: none;
}

.meta { color: var(--muted); font-size: .9rem; }

footer {
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
}

@media (max-width: 760px) {
  .shell { width: min(100% - 28px, 1080px); }
  main { padding: 42px 0 68px; }
  .hero { padding: 28px 0 44px; }
  .content-grid { grid-template-columns: 1fr; }
  .side-card { position: static; order: -1; }
  .site-header { min-height: 66px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}