:root {
  --bg: #0b1220;
  --bg-panel: #111b2e;
  --bg-card: #162236;
  --ink: #e8eef7;
  --ink-soft: #9fb0c9;
  --accent: #22d3ee;
  --accent-2: #38bdf8;
  --border: #24324a;
  --link: #67e8f9;
  --shadow: 0 16px 48px rgba(0, 0, 0, 0.35);
  --radius: 12px;
  --max: 1180px;
  --header-h: 64px;
  --font: "IBM Plex Sans", "Noto Sans SC", sans-serif;
  --font-display: "Space Grotesk", "Noto Sans SC", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 48px); }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.82;
  color: var(--ink);
  background: radial-gradient(ellipse 70% 50% at 50% -10%, rgba(34, 211, 238, 0.12), transparent), var(--bg);
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--link); text-decoration: none; }
a:hover { color: var(--accent); text-decoration: underline; }
.container { width: min(100% - 2rem, var(--max)); margin-inline: auto; }

.site-header {
  position: sticky; top: 0; z-index: 500;
  background: rgba(11, 18, 32, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-row {
  display: flex; align-items: center; justify-content: space-between;
  min-height: var(--header-h); gap: 1rem;
}
.brand {
  display: flex; align-items: center; gap: 0.6rem;
  color: var(--ink); font-family: var(--font-display); font-weight: 700; font-size: 1.1rem;
}
.brand:hover { color: var(--accent); text-decoration: none; }
.brand img { width: 38px; height: 38px; border-radius: 10px; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  width: 44px; height: 44px; padding: 10px;
  border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg-panel); cursor: pointer;
}
.nav-toggle span { height: 2px; background: var(--ink); border-radius: 2px; transition: 0.25s; }
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.site-nav ul { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; list-style: none; margin: 0; padding: 0; }
.site-nav a { color: var(--ink-soft); font-size: 0.92rem; font-weight: 500; padding: 0.35rem 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a.active { color: var(--accent); border-bottom-color: var(--accent); text-decoration: none; }

.ads-top-bar {
  padding: 0.6rem 0;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}
#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  background: transparent;
  margin: 10px 0;
  gap: 0.5rem;
}
#ads > div,
#ads .ads-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70px;
  box-sizing: border-box;
}
#ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 6px 18px rgba(24, 24, 24, 0.12);
  transition: transform 180ms ease, box-shadow 180ms ease;
  display: block;
  border: none;
  background: linear-gradient(135deg, #fff, #fff);
}
#ads a {
  display: inline-block;
  text-decoration: none;
  border-radius: 15px;
}
#ads img:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 10px 24px rgba(24, 24, 24, 0.18);
}
#ads figcaption,
#ads .caption {
  height: 15px;
  font-size: 11px;
  color: #666;
  text-align: center;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}
.applist-title {
  text-align: center;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.hero-split {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2rem;
  padding: 3rem 0; align-items: center;
}
.hero-split h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  line-height: 1.35; margin: 0 0 1rem;
}
.hero-tag {
  display: inline-block; padding: 0.3rem 0.75rem;
  background: rgba(34, 211, 238, 0.12); border: 1px solid rgba(34, 211, 238, 0.35);
  border-radius: 999px; font-size: 0.8rem; color: var(--accent); margin-bottom: 0.75rem;
}
.hero-split img { border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow); }

.tab-bar {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  padding: 1rem 0; border-bottom: 1px solid var(--border); margin-bottom: 2rem;
}
.tab-bar a {
  padding: 0.45rem 1rem; border-radius: 999px;
  background: var(--bg-panel); border: 1px solid var(--border);
  color: var(--ink-soft); font-size: 0.88rem;
}
.tab-bar a:hover { background: var(--accent); color: var(--bg); text-decoration: none; border-color: var(--accent); }

.link-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0.75rem 1.5rem;
  padding: 1rem 0; margin-bottom: 1rem;
}
.link-row a {
  padding: 0.5rem 1rem; border-radius: 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--accent-2); font-weight: 600; font-size: 0.9rem;
}
.link-row a:hover { background: var(--accent); color: var(--bg); text-decoration: none; }

.section { padding: 2.5rem 0; }
.section.alt { background: var(--bg-panel); }
.section h2 {
  font-family: var(--font-display); font-size: 1.55rem;
  margin: 0 0 1rem; color: var(--accent-2);
}
.prose p { margin: 0 0 1rem; color: var(--ink-soft); }
.prose strong { color: var(--ink); }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.3rem; color: var(--ink-soft); }

.zigzag { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; align-items: center; margin: 2rem 0; }
.zigzag.reverse { direction: rtl; }
.zigzag.reverse > * { direction: ltr; }
.zigzag img { border-radius: var(--radius); border: 1px solid var(--border); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 1.5rem 0; }
.card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; transition: transform 0.2s;
}
.card:hover { transform: translateY(-3px); }
.card img { aspect-ratio: 16/10; object-fit: cover; width: 100%; }
.card-body { padding: 1rem; }
.card-body h3 { margin: 0 0 0.35rem; font-size: 1rem; color: var(--ink); }
.card-body p { margin: 0; font-size: 0.88rem; color: var(--ink-soft); }

.page-hero { padding: 2rem 0; background: var(--bg-panel); border-bottom: 1px solid var(--border); }
.page-hero h1 { font-family: var(--font-display); margin: 0.5rem 0 0; }
.breadcrumb { font-size: 0.85rem; color: var(--ink-soft); }

.error-wrap { text-align: center; padding: 4rem 0; }
.error-wrap .code { font-size: 4rem; color: var(--accent); font-family: var(--font-display); margin: 0; }

.site-footer {
  margin-top: 2rem; padding: 2rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-panel); font-size: 0.88rem; color: var(--ink-soft);
}
.footer-links { display: flex; flex-wrap: wrap; gap: 1rem 2rem; margin-bottom: 1rem; }

@media (max-width: 900px) {
  .hero-split, .zigzag, .grid-3 { grid-template-columns: 1fr; }
  .zigzag.reverse { direction: ltr; }
}
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    background: var(--bg-panel); border-bottom: 1px solid var(--border);
    padding: 1rem; transform: translateY(-120%); opacity: 0; visibility: hidden;
    transition: 0.3s; box-shadow: var(--shadow);
  }
  .site-nav.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
  .site-nav ul { flex-direction: column; }
  .site-nav a { display: block; padding: 0.7rem 0; border-bottom: 1px solid var(--border); }
  .ads-top-bar .container { width: 100%; padding-inline: 0.75rem; }
  #ads {
    flex-wrap: nowrap;
    overflow-x: auto;
    scroll-snap-type: x proximity;
    justify-content: flex-start;
    -webkit-overflow-scrolling: touch;
  }
  #ads::-webkit-scrollbar { display: none; }
  #ads > div,
  #ads .ads-item { width: 84px; flex-shrink: 0; scroll-snap-align: center; }
}