/* 颜色与基线（科技风 + 与画册色调靠拢） */
:root{
  /* 基础底色与文字 */
  --bg:#F7F8FB;--text:#0b1220;--muted:#6B7280;--line:#E6E7EC;--alt:#F2F4F7;
  /* 主色采用画册红，辅以冷色霓虹做科技点缀 */
  --primary:#E11D48;        /* 玫红/红色主色（与证书页调性一致） */
  --primary-ink:#0B2545;    /* 深蓝文本色 */
  --accent:#22D3EE;         /* 霓虹青，用于高亮/光晕 */
}
/* 暗色主题 */
[data-theme="dark"]:root{
  --bg:#0F172A;--text:#E5E7EB;--muted:#9CA3AF;--line:#1F2937;--alt:#0B1324;
  --primary:#E11D48;--primary-ink:#E5E7EB;--accent:#22D3EE;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Inter,Helvetica,Arial,"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.6}
img{max-width:100%;height:auto}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:0 auto;padding:0 16px}
.row{display:flex;gap:16px}
.between{justify-content:space-between}.center{align-items:center}
.top{align-items:flex-start}
.tiny{font-size:12px}
.muted{color:var(--muted)}
.list{margin:0;padding-left:18px}

/* 头部与导航 */
.site-header{position:sticky;top:0;background:rgba(255,255,255,.9);backdrop-filter:saturate(140%) blur(6px);border-bottom:1px solid var(--line);z-index:20}
.brand{gap:10px}
.brand .logo{display:block}
.brand-text{font-weight:700;color:var(--primary-ink)}
.nav{display:flex;gap:18px}
.nav a{padding:12px 8px;color:var(--primary-ink);border-bottom:2px solid transparent;transition:color .2s,border-color .2s}
.nav a:hover{color:var(--primary)}
.nav a.active{color:var(--primary);border-color:var(--primary)}
.nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:6px;padding:6px 10px}
/* 主题切换按钮 */
#theme-toggle{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 10px;color:var(--primary-ink);cursor:pointer}
[data-theme="dark"] #theme-toggle{background:#111827;color:#E5E7EB;border-color:#374151}
/* 焦点可见性 */
.nav a:focus,.btn:focus,.nav-toggle:focus{outline:2px solid var(--primary);outline-offset:2px}

.hero{position:relative;color:#fff;padding:64px 0;overflow:hidden;
  background:
    radial-gradient(600px 300px at 10% 0%, rgba(34,211,238,.18), transparent 60%),
    radial-gradient(700px 350px at 100% 90%, rgba(225,29,72,.16), transparent 60%),
    linear-gradient(180deg,#0B1B33 0%,#0F172A 100%);
}
[data-theme="dark"] .hero{background:
  radial-gradient(700px 350px at 100% 90%, rgba(225,29,72,.22), transparent 60%),
  linear-gradient(180deg,#0B0F1E 0%,#020617 100%);
}
.hero:before{content:"";position:absolute;inset:0;pointer-events:none;opacity:.25;
  background:
    linear-gradient(transparent 24px, rgba(255,255,255,.06) 25px) 0 0/100% 25px,
    linear-gradient(90deg, transparent 24px, rgba(255,255,255,.06) 25px) 0 0/25px 100%;
}
.hero h1{font-size:32px;margin:0 0 8px}
.hero p{max-width:720px;margin:0 0 20px}
.hero-cta{display:flex;gap:12px}
.hero-art{position:absolute;inset:auto 0 0 0;display:flex;justify-content:center;opacity:.6}
.hero-art img{max-width:1200px;width:100%;mix-blend:screen;filter:drop-shadow(0 8px 24px rgba(34,211,238,.2))}
[data-theme="dark"] .hero-art{opacity:.7}

/* 区块 */
.section{padding:48px 0}
.section.alt{background:var(--alt)}
.section-title{margin:0 0 16px;font-size:24px;color:var(--primary-ink)}
.grid{display:grid;gap:16px}
.grid.cards{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid.three{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.card{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fff;transition:box-shadow .2s,transform .2s,border-color .2s}
[data-theme="dark"] .card{background:#0B1220;border-color:#1F2937}
.card:hover{box-shadow:0 10px 26px rgba(2,6,23,.12);transform:translateY(-3px);border-color:rgba(34,211,238,.5)}
[data-theme="dark"] .card:hover{box-shadow:0 10px 26px rgba(0,0,0,.6)}
.feature{border-left:4px solid var(--primary);padding:10px 12px;background:#fff;border-radius:6px;border:1px solid var(--line)}
.badges{display:flex;gap:10px;list-style:none;padding:0;margin:6px 0 0}
.badges li{border:1px dashed var(--line);border-radius:999px;padding:6px 10px;background:#fff}
.cta-box{border:1px solid var(--line);border-radius:14px;padding:16px;background:#fbfbfd;margin-top:18px;box-shadow:0 10px 30px rgba(2,6,23,.05)}
/* 画册廊 */
.grid.cards img[data-lightbox]{border:1px solid var(--line);border-radius:10px;background:#fff}
.grid.cards img[data-lightbox]{cursor:zoom-in}

/* 按钮 */
.btn{display:inline-block;border-radius:10px;padding:10px 14px;border:1px solid var(--primary);color:#fff;background:var(--primary);
  box-shadow:0 0 0 rgba(34,211,238,0);transition:box-shadow .2s,filter .2s}
.btn:hover{text-decoration:none;filter:brightness(.95)}
.btn-outline{background:#fff;color:var(--primary)}
.btn-primary{background:var(--primary);border-color:var(--primary)}
.btn-primary:hover{box-shadow:0 0 0 3px rgba(34,211,238,.25)}

/* 页脚 */
.site-footer{border-top:1px solid var(--line);padding:24px 0;background:linear-gradient(180deg,#ffffff 0%,#f5f7fb 100%)}
[data-theme="dark"] .site-footer{background:#0B1220}
.footer-grid{gap:28px}

/* 下载列表 */
.downloads{list-style:none;padding:0;margin:0}
.downloads li{padding:10px 0;border-bottom:1px solid var(--line)}

/* 表格（证书墙） */
table{width:100%;border-collapse:collapse;margin:12px 0;background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden}
th,td{padding:10px;border-bottom:1px solid var(--line);text-align:left}
th{background:#fafafa;color:var(--primary-ink)}
tr:last-child td{border-bottom:none}
.table-tools{display:flex;justify-content:flex-end;margin:6px 0}
.table-tools input{border:1px solid var(--line);padding:6px 10px;border-radius:8px}
[data-theme="dark"] th{background:#0B1220}
[data-theme="dark"] .table-tools input{background:#0B1220;color:var(--text);border-color:#1F2937}

/* 地图占位 */
.map-placeholder{height:220px;border:1px dashed var(--line);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--muted)}

/* 小屏适配 */
@media (max-width: 840px){
  .nav{display:none;flex-direction:column;background:#fff;position:absolute;right:16px;top:56px;border:1px solid var(--line);border-radius:10px;padding:8px 10px}
  .nav.open{display:flex}
  .nav-toggle{display:block}
}

/* 居中页面（404） */
.center-page{min-height:100vh;display:grid;place-items:center}

/* Lightbox */

/* 暗色下提升 LOGO 可读性 */
[data-theme="dark"] .brand .logo{background:#fff;border-radius:6px;padding:2px}
.lightbox-backdrop{position:fixed;inset:0;background:rgba(0,0,0,.8);display:none;align-items:center;justify-content:center;z-index:100}
.lightbox-backdrop.open{display:flex}
.lightbox-img{max-width:92vw;max-height:86vh;box-shadow:0 8px 30px rgba(0,0,0,.5);border-radius:10px}
.lightbox-close,.lightbox-prev,.lightbox-next{position:absolute;background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:8px;padding:6px 10px;cursor:pointer}
.lightbox-close{top:16px;right:16px}
.lightbox-prev{left:16px}
.lightbox-next{right:16px}
.lightbox-prev,.lightbox-next{top:50%;transform:translateY(-50%)}
.lightbox-close:focus,.lightbox-prev:focus,.lightbox-next:focus{outline:2px solid var(--primary)}