:root{
  --bg:#f7f8fa; --card:#ffffff; --line:#e9ebee;
  --text:#1a1f26; --muted:#6b7280; --faint:#9aa1ab;
  --accent:#2563eb; --accent-soft:#eef4ff;
  --radius:14px; color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);
  font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}

/* 导航 */
.nav{position:sticky;top:0;z-index:20;background:rgba(247,248,250,.86);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1000px;margin:0 auto;padding:13px 24px;display:flex;
  align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:11px;font-weight:650;font-size:17px}
.brand img{width:34px;height:34px;border-radius:50%;object-fit:cover;flex:none}
.brand .sub{font-size:12px;font-weight:400;color:var(--faint);
  padding-left:12px;border-left:1px solid var(--line);margin-left:2px}
.nav nav{display:flex;gap:2px}
.nav nav a{padding:8px 14px;border-radius:9px;font-size:14px;
  color:var(--muted);transition:.15s}
.nav nav a:hover{color:var(--text);background:#eef0f3}

main{max-width:1000px;margin:0 auto;padding:56px 24px 80px}

/* 首页 */
.hero{text-align:center;margin-bottom:34px}
.eyebrow{display:inline-flex;align-items:center;gap:7px;font-size:13px;
  color:var(--muted);margin-bottom:14px}
.eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:#22c55e}
.hero h1{margin:0 0 10px;font-size:40px;letter-spacing:-.5px;
  font-weight:750;color:#11151a}
.hero p{margin:0;color:var(--muted);font-size:15px}

.menu{max-width:620px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.menu-item{display:flex;align-items:center;gap:16px;padding:20px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  transition:.18s;box-shadow:0 1px 2px rgba(16,24,40,.03)}
.menu-item:hover{transform:translateY(-2px);border-color:#d6dbe2;
  box-shadow:0 8px 24px rgba(16,24,40,.06)}
.menu-item .ico{width:44px;height:44px;border-radius:11px;display:flex;
  align-items:center;justify-content:center;font-size:20px;flex:none}
.ico.blue{background:#eaf1ff}.ico.green{background:#e9f7ef}
.ico.orange{background:#fff3e2}.ico.purple{background:#f1ecfd}
.ico.pink{background:#fdeef2}
.menu-item .body{flex:1;min-width:0}
.menu-item h3{margin:0 0 3px;font-size:15.5px;font-weight:600}
.menu-item p{margin:0;font-size:13px;color:var(--muted)}
.menu-item .arrow{color:#c2c8d0;font-size:18px;flex:none;transition:.18s}
.menu-item:hover .arrow{color:var(--muted);transform:translate(2px,-2px)}
.menu-item.hl{background:#f5f8ff;border-color:#cdddfb}

/* 区块 */
.section{margin-top:56px}
.section-head{display:flex;align-items:baseline;justify-content:space-between;
  margin-bottom:16px}
.section-head h2{margin:0;font-size:19px;font-weight:650}
.section-head a{font-size:13px;color:var(--muted)}
.section-head a:hover{color:var(--accent)}

/* 卡片 */
.cards{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.card{display:block;padding:20px;border-radius:var(--radius);background:var(--card);
  border:1px solid var(--line);transition:.18s;box-shadow:0 1px 2px rgba(16,24,40,.03)}
.card:hover{transform:translateY(-2px);border-color:#d6dbe2;
  box-shadow:0 8px 24px rgba(16,24,40,.06)}
.card h3{margin:0 0 6px;font-size:15.5px;font-weight:600}
.card p{margin:0;color:var(--muted);font-size:13px;line-height:1.65}
.meta{margin-top:10px;font-size:12px;color:var(--faint)}
.tag{display:inline-block;padding:2px 9px;border-radius:999px;font-size:11px;
  background:var(--accent-soft);color:#3b6fd4}

/* 文章 */
.article{max-width:760px;margin:0 auto}
.article h1{font-size:30px;letter-spacing:-.4px;margin:0 0 8px;line-height:1.35}
.article .meta{margin-bottom:30px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.prose{font-size:15.5px;line-height:1.85;color:#2b323b}
.prose h2{margin:34px 0 12px;font-size:21px;font-weight:650}
.prose h3{margin:26px 0 10px;font-size:17.5px;font-weight:600}
.prose p{margin:0 0 16px}
.prose a{color:var(--accent)}
.prose code{padding:2px 6px;border-radius:5px;background:#eef1f5;font-size:13px}
.prose pre{padding:16px;border-radius:10px;background:#f3f5f8;
  border:1px solid var(--line);overflow:auto}
.prose pre code{padding:0;background:none}
.prose blockquote{margin:16px 0;padding:10px 16px;border-left:3px solid #d7dce3;
  background:#f7f8fa;color:#4b5563;border-radius:0 8px 8px 0}
.prose img{border-radius:10px}
.prose table{border-collapse:collapse;width:100%;margin:16px 0}
.prose th,.prose td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.prose th{background:#f7f8fa}

/* 列表 */
.list{display:flex;flex-direction:column;gap:12px;max-width:760px;margin:0 auto}
.row{display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;border-radius:var(--radius);background:var(--card);
  border:1px solid var(--line)}
.row .info h3{margin:0 0 4px;font-size:15px;font-weight:600}
.row .info p{margin:0;font-size:12.5px;color:var(--muted)}
.row .ops{display:flex;gap:8px;flex-shrink:0;flex-wrap:wrap}
.empty{padding:70px 20px;text-align:center;color:var(--faint);font-size:14px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:10px 18px;border-radius:10px;font-size:13.5px;font-weight:550;
  border:1px solid var(--line);background:#fff;color:var(--text);
  cursor:pointer;transition:.16s;font-family:inherit}
.btn:hover{background:#f5f6f8;border-color:#d6dbe2}
.btn.primary{background:#1a1f26;border-color:#1a1f26;color:#fff}
.btn.primary:hover{background:#2b3440}
.btn.danger{background:#fff;border-color:#f0c9c9;color:#c53b3b}
.btn.danger:hover{background:#fff5f5}
.btn.small{padding:7px 13px;font-size:12.5px;border-radius:8px}

/* 表单 */
.field{margin-bottom:16px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:7px;font-weight:500}
input[type=text],input[type=password],input[type=url],textarea{
  width:100%;padding:11px 13px;border-radius:9px;border:1px solid var(--line);
  background:#fff;color:var(--text);font-size:14px;outline:none;
  font-family:inherit;transition:.15s}
input:focus,textarea:focus{border-color:#9db8e8;
  box-shadow:0 0 0 3px rgba(37,99,235,.1)}
textarea{min-height:340px;resize:vertical;line-height:1.7}
input[type=file]{width:100%;padding:10px;border:1px dashed #d6dbe2;
  border-radius:9px;background:#fafbfc;color:var(--muted);font-size:13px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.form-card{padding:22px;border-radius:var(--radius);background:var(--card);
  border:1px solid var(--line);margin-bottom:20px}
.form-card h3{margin:0 0 16px;font-size:15.5px;font-weight:600}

/* 管理 */
.admin-head{display:flex;align-items:center;justify-content:space-between;
  gap:16px;margin-bottom:26px;flex-wrap:wrap}
.admin-head h1{margin:0;font-size:24px;font-weight:700}
.panel-grid{display:grid;gap:14px;
  grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.panel-card{display:block;padding:24px 20px;border-radius:var(--radius);
  background:var(--card);border:1px solid var(--line);transition:.18s}
.panel-card:hover{transform:translateY(-2px);border-color:#d6dbe2;
  box-shadow:0 8px 24px rgba(16,24,40,.06)}
.panel-card .ico{font-size:24px;margin-bottom:12px}
.panel-card h3{margin:0 0 5px;font-size:15.5px;font-weight:600}
.panel-card p{margin:0;color:var(--muted);font-size:12.5px}

/* 登录 */
.login-wrap{min-height:70vh;display:flex;align-items:center;justify-content:center}
.login-card{width:100%;max-width:390px;padding:34px 30px;border-radius:18px;
  background:#fff;border:1px solid var(--line);
  box-shadow:0 20px 50px rgba(16,24,40,.08)}
.login-card .logo{width:60px;height:60px;margin:0 auto 16px;border-radius:50%;
  overflow:hidden;box-shadow:0 6px 18px rgba(16,24,40,.12)}
.login-card .logo img{width:100%;height:100%;object-fit:cover;display:block}
.login-card h1{margin:0 0 6px;text-align:center;font-size:21px;font-weight:700}
.login-card .sub{margin:0 0 24px;text-align:center;font-size:13px;color:var(--muted)}
.err{padding:11px 13px;border-radius:9px;font-size:13px;margin-bottom:16px;
  background:#fff5f5;border:1px solid #f5d0d0;color:#b91c1c}
.ok{padding:11px 13px;border-radius:9px;font-size:13px;margin-bottom:16px;
  background:#f0fbf4;border:1px solid #c9ecd5;color:#15803d}

footer{max-width:1000px;margin:0 auto;padding:28px 24px 44px;display:flex;
  gap:10px;align-items:center;justify-content:center;
  color:var(--faint);font-size:12.5px}
.secret-dot{cursor:default;opacity:.5;padding:4px 8px;user-select:none}

@media(max-width:640px){
  .grid-2{grid-template-columns:1fr}
  .nav-inner{padding:12px 16px}
  .brand .sub{display:none}
  main{padding:36px 16px 60px}
  .hero h1{font-size:31px}
  .row{flex-direction:column;align-items:flex-start}
}

/* 摄像头（保持深色全屏） */
body.cam-page{overflow:hidden;background:#000;color:#fff}
.cam-stage{position:fixed;inset:0;display:flex;align-items:center;
  justify-content:center;background:#000}
.cam-stage img{width:100%;height:100%;object-fit:contain;display:block;max-width:none}
.cam-hud{position:fixed;left:0;right:0;top:0;display:flex;align-items:center;
  gap:8px;padding:12px 16px;background:linear-gradient(rgba(0,0,0,.7),transparent);
  font-size:13px;pointer-events:none;flex-wrap:wrap;z-index:5}
.cam-hud .badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;
  border-radius:999px;background:rgba(255,255,255,.12);white-space:nowrap}
.cam-hud .dot{width:8px;height:8px;border-radius:50%;background:#888;flex:none}
.cam-hud .dot.on{background:#2ecc71;box-shadow:0 0 8px #2ecc71}
.cam-bar{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:center;
  align-items:center;gap:8px;padding:14px;flex-wrap:wrap;z-index:5;
  background:linear-gradient(transparent,rgba(0,0,0,.75))}
body.cam-page .btn{background:rgba(255,255,255,.1);
  border-color:rgba(255,255,255,.16);color:#fff}
body.cam-page .btn:hover{background:rgba(255,255,255,.18)}
body.cam-page .btn.active{background:#fff;border-color:#fff;color:#11151a}
.cam-bar .btn{font-size:13px;padding:9px 15px}