/* 洛天依 · 纯蓝主题 —— 零外部依赖，系统字体 */
:root {
  --tianyi: #66ccff; --tianyi-deep: #2b9fe0; --ink: #eaf6ff; --muted: #8fb3cc;
  --bg-0: #071120; --bg-1: #0d1f3a; --card: rgba(102, 204, 255, 0.06);
  --line: rgba(102, 204, 255, 0.18); --glow: rgba(102, 204, 255, 0.35);
  --radius: 14px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(43, 159, 224, 0.25), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(102, 204, 255, 0.12), transparent 55%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 70%, var(--bg-0));
  color: var(--ink); line-height: 1.75; min-height: 100vh;
}
/* ---- 顶部导航 ---- */
.nav {
  position: fixed; inset: 0 0 auto; z-index: 60;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 28px;
  background: rgba(7, 17, 32, 0.65);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-brand { color: var(--tianyi); font-size: 1.15rem; font-weight: 700; letter-spacing: 0.2em; text-decoration: none; }
.nav-links a { color: var(--muted); text-decoration: none; margin-left: 22px; font-size: 0.95rem; transition: color 0.2s; }
.nav-links a:hover { color: var(--tianyi); }
/* ---- Hero ---- */
.hero {
  position: relative; min-height: 100vh;
  display: grid; place-items: center; text-align: center;
  overflow: hidden; padding: 80px 24px;
}
.hero::before {
  content: ""; position: absolute; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, var(--glow), transparent 65%);
  animation: breathe 6s ease-in-out infinite;
}
@keyframes breathe { 0%, 100% { opacity: 0.45; transform: scale(1); } 50% { opacity: 0.85; transform: scale(1.12); } }
.hero h1 {
  font-size: clamp(3rem, 11vw, 6.5rem); letter-spacing: 0.18em; font-weight: 800;
  background: linear-gradient(180deg, #ffffff 20%, var(--tianyi) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  text-shadow: 0 0 60px var(--glow);
}
.hero p { margin-top: 18px; color: var(--muted); font-size: clamp(1rem, 2.6vw, 1.3rem); letter-spacing: 0.08em; }
/* ---- 区块 ---- */
.section { max-width: 980px; margin: 0 auto; padding: 88px 24px; }
.section h2 {
  font-size: clamp(1.5rem, 4vw, 2rem); letter-spacing: 0.14em;
  margin-bottom: 34px; position: relative; padding-left: 16px;
}
.section h2::before {
  content: ""; position: absolute; left: 0; top: 8px; bottom: 8px; width: 4px; border-radius: 4px;
  background: linear-gradient(180deg, var(--tianyi), transparent);
}
/* ---- 简介 ---- */
.about-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 32px; backdrop-filter: blur(8px);
}
.about-card p { color: var(--muted); margin-bottom: 12px; }
.about-card strong { color: var(--tianyi); font-weight: 600; }
/* ---- 消息 ---- */
.news-item {
  background: var(--card); border: 1px solid var(--line); border-left: 3px solid var(--tianyi);
  border-radius: var(--radius); padding: 20px 26px; margin-bottom: 18px;
  transition: transform 0.2s, border-color 0.2s;
}
.news-item:hover { transform: translateX(4px); border-color: var(--tianyi-deep); }
.news-item time {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  color: var(--tianyi); font-size: 0.85rem;
}
.news-item h3 { font-size: 1.08rem; margin: 4px 0 8px; }
.news-item p { color: var(--muted); font-size: 0.95rem; }
.news-item .source {
  display: inline-block; margin-top: 10px; font-size: 0.78rem; color: var(--tianyi-deep);
  border: 1px solid var(--line); padding: 2px 10px; border-radius: 999px;
}
/* ---- 图集 ---- */
.gallery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.gallery-grid figure { margin: 0; }
.gallery-img {
  width: 100%; aspect-ratio: 1 / 1; object-fit: cover;
  border-radius: 12px; border: 1px solid var(--line); cursor: zoom-in;
  transition: transform 0.25s, box-shadow 0.25s;
}
.gallery-img:hover { transform: scale(1.03); box-shadow: 0 12px 40px var(--glow); }
.gallery-note { color: var(--muted); font-size: 0.8rem; margin-top: 14px; }
/* ---- 灯箱 ---- */
.lightbox {
  position: fixed; inset: 0; z-index: 100; background: rgba(4, 10, 20, 0.92);
  display: grid; place-items: center; padding: 24px;
}
.lightbox img { max-width: 92vw; max-height: 84vh; border-radius: 12px; box-shadow: 0 20px 80px rgba(0, 0, 0, 0.6); }
.lightbox button {
  position: absolute; background: rgba(102, 204, 255, 0.12); color: var(--ink);
  border: 1px solid var(--line); border-radius: 50%; width: 44px; height: 44px;
  font-size: 1.3rem; cursor: pointer; transition: background 0.2s;
}
.lightbox button:hover { background: rgba(102, 204, 255, 0.3); }
.lb-close { top: 24px; right: 28px; }
.lb-prev { left: 20px; top: 50%; transform: translateY(-50%); }
.lb-next { right: 20px; top: 50%; transform: translateY(-50%); }
/* ---- 页脚 ---- */
footer {
  text-align: center; padding: 40px 24px 56px; color: var(--muted);
  font-size: 0.82rem; border-top: 1px solid var(--line);
}
/* ---- 响应式 ---- */
@media (max-width: 640px) {
  .nav { padding: 12px 16px; }
  .nav-links a { margin-left: 14px; font-size: 0.88rem; }
  .section { padding: 64px 18px; }
  .lightbox button { width: 38px; height: 38px; }
}