:root {
  --bg: #f6f9fc;
  --bg-card: #ffffff;
  --bg-soft: #eaf3fa;
  --text: #12303f;
  --text-muted: #4d6b7a;
  --accent: #0097d6;
  --accent-dark: #0073a3;
  --accent-soft: #d9f0fc;
  --border: #d8e5ee;
  --shadow: 0 2px 10px rgba(18, 48, 63, 0.07);
  --radius: 12px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}
[data-theme="dark"] {
  --bg: #0d1b24;
  --bg-card: #14252f;
  --bg-soft: #1a2f3b;
  --text: #dceaf2;
  --text-muted: #93adb9;
  --accent: #35b6f0;
  --accent-dark: #58c4f2;
  --accent-soft: #12384c;
  --border: #25404e;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.4);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.25s, color 0.25s;
}
a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.nav {
  max-width: 1100px; margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.05rem; color: var(--text); letter-spacing: 0.2px; }
.brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: 4px; flex-wrap: wrap; flex: 1; }
.nav-links a {
  padding: 6px 10px; border-radius: 8px; color: var(--text-muted);
  font-size: 0.9rem; font-weight: 600;
}
.nav-links a:hover, .nav-links a.active { background: var(--accent-soft); color: var(--accent-dark); text-decoration: none; }
.nav-actions { display: flex; gap: 8px; align-items: center; }
.icon-btn {
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 6px 12px; cursor: pointer; font-size: 0.9rem; font-weight: 600;
}
.icon-btn:hover { background: var(--accent-soft); }

main { max-width: 1100px; margin: 0 auto; padding: 28px 20px 60px; }

.hero {
  text-align: center; padding: 44px 16px 36px;
  background: linear-gradient(160deg, var(--accent-soft), var(--bg-card));
  border: 1px solid var(--border); border-radius: var(--radius);
}
.hero .tag {
  display: inline-block; background: var(--accent); color: #fff;
  font-size: 0.78rem; font-weight: 700; padding: 4px 12px; border-radius: 20px;
  letter-spacing: 0.6px; margin-bottom: 14px;
}
.hero h1 { font-size: 2rem; line-height: 1.25; margin-bottom: 10px; }
.hero p { color: var(--text-muted); max-width: 640px; margin: 0 auto 18px; }
.btn {
  display: inline-block; background: var(--accent); color: #fff !important;
  padding: 10px 22px; border-radius: 10px; font-weight: 700; font-size: 0.95rem;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--accent-dark) !important; border: 1.5px solid var(--accent); }
.btn.ghost:hover { background: var(--accent-soft); }

.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px; margin: 26px 0;
}
.stat { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; text-align: center; box-shadow: var(--shadow); }
.stat b { display: block; font-size: 1.6rem; color: var(--accent-dark); }
.stat span { font-size: 0.85rem; color: var(--text-muted); }

h2.sec { font-size: 1.45rem; margin: 40px 0 6px; }
p.sec-sub { color: var(--text-muted); margin-bottom: 18px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.card h3 { font-size: 1.02rem; margin-bottom: 6px; color: var(--accent-dark); }
.card p { font-size: 0.92rem; color: var(--text-muted); }
.card .src { display: block; margin-top: 10px; font-size: 0.78rem; color: var(--text-muted); opacity: 0.75; }

.kat-card { text-decoration: none !important; color: var(--text); display: block; transition: transform 0.15s; }
.kat-card:hover { transform: translateY(-3px); }
.kat-card .ico { font-size: 1.8rem; margin-bottom: 8px; }
.kat-card h3 { color: var(--text); margin-bottom: 4px; }
.kat-card p { font-size: 0.88rem; color: var(--text-muted); }
.kat-card .go { color: var(--accent-dark); font-weight: 700; font-size: 0.85rem; margin-top: 10px; display: inline-block; }

table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { background: var(--bg-soft); color: var(--text); font-weight: 700; }
tr:hover td { background: var(--bg-soft); }

.chart-wrap { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); margin: 16px 0; }
.chart-wrap h3 { font-size: 1rem; margin-bottom: 2px; }
.chart-wrap p { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 10px; }
.chart-wrap svg { width: 100%; height: auto; display: block; }
.chart-legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; }

.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.gallery figure { margin: 0; cursor: zoom-in; }
.gallery img { width: 100%; height: 150px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); background: var(--bg-soft); }
.gallery figcaption { font-size: 0.72rem; color: var(--text-muted); margin-top: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.lightbox {
  position: fixed; inset: 0; background: rgba(6, 16, 22, 0.92); z-index: 100;
  display: none; align-items: center; justify-content: center; flex-direction: column; padding: 20px;
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 94vw; max-height: 78vh; border-radius: 8px; }
.lightbox .cap { color: #cfe6f2; margin-top: 12px; font-size: 0.9rem; text-align: center; max-width: 80vw; }
.lightbox .close {
  position: absolute; top: 16px; right: 22px; background: none; border: none; color: #fff;
  font-size: 2rem; cursor: pointer; line-height: 1;
}
.lightbox .navbtn {
  position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,0.12);
  border: none; color: #fff; font-size: 1.6rem; width: 44px; height: 44px; border-radius: 50%; cursor: pointer;
}
.lightbox .navbtn:hover { background: rgba(255,255,255,0.25); }
.lightbox .prev { left: 12px; }
.lightbox .next { right: 12px; }

.search-overlay {
  position: fixed; inset: 0; background: rgba(6, 16, 22, 0.6); z-index: 90;
  display: none; align-items: flex-start; justify-content: center; padding: 8vh 16px 16px;
}
.search-overlay.open { display: flex; }
.search-box {
  background: var(--bg-card); border-radius: var(--radius); width: 100%; max-width: 640px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.3); overflow: hidden;
}
.search-box input {
  width: 100%; padding: 16px 18px; font-size: 1rem; border: none; outline: none;
  background: transparent; color: var(--text);
  border-bottom: 1px solid var(--border);
}
.search-results { max-height: 55vh; overflow-y: auto; padding: 10px; }
.search-results .r { padding: 10px 12px; border-radius: 8px; cursor: pointer; }
.search-results .r:hover { background: var(--bg-soft); }
.search-results .r b { color: var(--accent-dark); }
.search-results .r .s { font-size: 0.78rem; color: var(--text-muted); }
.search-empty { padding: 18px; color: var(--text-muted); font-size: 0.9rem; }

footer { border-top: 1px solid var(--border); background: var(--bg-card); margin-top: 40px; }
.footer-in { max-width: 1100px; margin: 0 auto; padding: 22px 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; color: var(--text-muted); font-size: 0.85rem; }

.file-list li { display: flex; justify-content: space-between; gap: 12px; padding: 10px 4px; border-bottom: 1px solid var(--border); font-size: 0.9rem; flex-wrap: wrap; }
.file-list .nm { word-break: break-all; }
.file-list .sz { color: var(--text-muted); white-space: nowrap; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.5rem; }
  main { padding: 20px 14px 50px; }
  .gallery { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
  .gallery img { height: 110px; }
}