/* ===== 设计变量 ===== */
:root{
  --navy-900:#0a1628; --navy-800:#0f213d; --navy-700:#16305a; --navy-100:#e8eef7;
  --ink:#1b2a41; --muted:#5b6b82; --line:#e3e8f0; --bg:#f6f8fb; --white:#fff;
  --accent:#13b5a6; --accent-dark:#0e8f84; --accent-soft:#e3f7f5;
  --danger:#e05252;
  --radius:16px; --shadow:0 6px 24px rgba(15,33,61,.08);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC","WenQuanYi Micro Hei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Noto Sans Mono CJK SC",monospace;
  --maxw:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--accent-dark);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ===== 页头 / 导航 ===== */
.site-header{position:sticky;top:0;z-index:10;background:rgba(10,22,40,.92);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid rgba(255,255,255,.06)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px;letter-spacing:.3px;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand-mark{width:30px;height:30px;border-radius:8px;flex:none}
.nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{color:#c4d0e3;padding:8px 14px;border-radius:999px;font-size:15px;white-space:nowrap;transition:background .2s,color .2s}
.nav a:hover{color:#fff;background:rgba(255,255,255,.08);text-decoration:none}
.nav a[aria-current="page"]{color:var(--navy-900);background:var(--accent);font-weight:600}

/* ===== Hero ===== */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(19,181,166,.25),transparent 60%),linear-gradient(180deg,var(--navy-900),var(--navy-800));color:#fff;padding:88px 0 96px}
.hero.small{padding:64px 0 56px}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--accent);font-weight:600;margin-bottom:14px}
.hero h1{font-size:clamp(30px,5vw,48px);line-height:1.25;margin:0 0 18px;font-weight:700;letter-spacing:.5px}
.hero.small h1{font-size:clamp(26px,4vw,38px)}
.hero p.lead{font-size:clamp(16px,2vw,19px);color:#c4d0e3;max-width:720px;margin:0}
.hero .actions{margin-top:32px;display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-block;padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:var(--navy-900)}
.btn-primary:hover{background:#2bc9ba}
.btn-ghost{border:1px solid rgba(255,255,255,.25);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.url-pill{display:inline-flex;align-items:center;gap:8px;margin-top:28px;padding:8px 14px;border-radius:10px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);font-family:var(--mono);font-size:14px;color:#dce6f5;word-break:break-all}
.url-pill .dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(19,181,166,.2);flex:none}

/* ===== 区块 ===== */
main{display:block}
.section{padding:72px 0}
.section + .section{padding-top:0}
.section-title{font-size:clamp(22px,3vw,30px);margin:0 0 10px;font-weight:700;color:var(--navy-800)}
.section-sub{color:var(--muted);margin:0 0 36px;max-width:720px}
h2{color:var(--navy-800)}
h3{color:var(--navy-800);margin:0 0 8px;font-size:19px}

.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.card p{margin:0;color:var(--muted)}
.card .icon{width:40px;height:40px;border-radius:12px;background:var(--accent-soft);color:var(--accent-dark);display:grid;place-items:center;font-weight:700;margin-bottom:14px}
.card.dark{background:linear-gradient(160deg,var(--navy-800),var(--navy-700));color:#fff;border:none}
.card.dark h3{color:#fff}.card.dark p{color:#c4d0e3}
.card.dark code{background:rgba(255,255,255,.1);color:#9fe6de}

/* 图示 */
figure.diagram{margin:0 0 40px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
figure.diagram img{width:100%;border-radius:10px}
figure.diagram figcaption{margin-top:14px;font-size:14px;color:var(--muted);text-align:center}
figure.diagram figcaption strong{color:var(--navy-800)}

/* 步骤 */
.steps{list-style:none;margin:0;padding:0;counter-reset:step}
.steps li{position:relative;padding:0 0 28px 64px;counter-increment:step}
.steps li::before{content:counter(step);position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;background:var(--navy-800);color:#fff;display:grid;place-items:center;font-weight:700}
.steps li::after{content:"";position:absolute;left:19px;top:44px;bottom:4px;width:2px;background:var(--line)}
.steps li:last-child::after{display:none}
.steps li h3{padding-top:6px}
.steps li p{margin:4px 0 0;color:var(--muted)}

/* 代码 */
pre,code{font-family:var(--mono);font-size:14px}
code{background:var(--navy-100);color:var(--navy-700);padding:2px 6px;border-radius:6px}
pre{background:var(--navy-900);color:#dce6f5;padding:20px 22px;border-radius:12px;overflow-x:auto;line-height:1.65;margin:14px 0 0}
pre code{background:none;color:inherit;padding:0}
pre .c{color:#7f93b2}
pre .k{color:var(--accent)}

/* 表格 */
.table-wrap{overflow-x:auto;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;min-width:620px}
th,td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top;font-size:15px}
th{background:#f0f4fa;color:var(--navy-800);font-weight:600}
tr:last-child td{border-bottom:none}
.tag{display:inline-block;padding:2px 10px;border-radius:999px;font-size:13px;font-weight:600;white-space:nowrap}
.tag.ok{background:var(--accent-soft);color:var(--accent-dark)}
.tag.no{background:#fdeaea;color:#b93a3a}

/* 提示框 */
.note{border-left:4px solid var(--accent);background:var(--accent-soft);padding:16px 20px;border-radius:0 12px 12px 0;color:var(--ink);margin:20px 0 0}
.note.warn{border-color:#d9a21b;background:#fdf6e3}

/* FAQ */
.faq details{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:0 24px;margin-bottom:14px;box-shadow:var(--shadow)}
.faq summary{cursor:pointer;list-style:none;padding:20px 0;font-weight:600;font-size:17px;color:var(--navy-800);display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent-dark);font-size:22px;line-height:1;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details > div{padding:0 0 20px;color:var(--muted)}
.faq details > div p{margin:0 0 10px}

/* CTA */
.cta{background:linear-gradient(135deg,var(--navy-800),var(--navy-700));color:#fff;border-radius:20px;padding:44px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.cta h2{color:#fff;margin:0 0 6px;font-size:24px}
.cta p{margin:0;color:#c4d0e3}

/* ===== 页脚 ===== */
.site-footer{background:var(--navy-900);color:#8b9bb4;padding:40px 0;margin-top:40px;font-size:14px}
.site-footer .container{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:20px}
.footer-brand{display:flex;flex-direction:column;gap:4px}
.footer-brand strong{color:#fff;font-size:16px}
.footer-meta{font-size:12.5px;color:#6f819c}
.site-footer a{color:#c4d0e3}
.footer-nav{display:flex;gap:18px;flex-wrap:wrap}

/* ===== 响应式 ===== */
@media (max-width:860px){
  .grid-3{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .site-header .container{height:auto;flex-direction:column;align-items:flex-start;padding-top:12px;padding-bottom:10px;gap:8px}
  .nav{width:100%;margin:0 -6px}
  .nav a{padding:6px 12px;font-size:14px}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .hero{padding:56px 0 64px}
  .section{padding:52px 0}
  .card{padding:22px}
  figure.diagram{padding:10px}
  .cta{padding:28px}
  .steps li{padding-left:56px}
}

/* ===== 多版块组件 ===== */
.container.narrow{max-width:860px}
.section.tight{padding-top:0}
.accent-text{color:var(--accent)}
.hero-sub{margin:22px 0 0;color:#8fa3c0;font-size:15px;letter-spacing:1px}
.crumbs{font-size:13.5px;color:#8fa3c0;margin-bottom:18px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.crumbs a{color:#c4d0e3}.crumbs i{font-style:normal;color:#4d6386}
.crumbs span{color:#8fa3c0}
.hero-meta{margin-top:22px;display:flex;flex-wrap:wrap;gap:8px;align-items:center;color:#c4d0e3;font-size:14px}
.hero-meta time{margin-right:6px}
.hero-meta .chip{background:rgba(255,255,255,.08);color:#dce6f5;border-color:rgba(255,255,255,.14)}
.chip{display:inline-block;padding:2px 10px;border-radius:999px;font-size:12.5px;background:#f0f4fa;color:var(--navy-700);border:1px solid var(--line);white-space:nowrap}
.chip.accent{background:var(--accent-soft);color:var(--accent-dark);border-color:#c5ece7}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:13.5px;color:var(--muted);margin-bottom:10px}
.count{font-size:13px;color:var(--muted);white-space:nowrap}
.more{font-weight:600;font-size:14.5px;white-space:nowrap}
.list-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:24px}
.list-head .section-title{margin:0}
.empty-state{color:var(--muted)}
.btn-dark{background:var(--navy-800);color:#fff}
.btn-dark:hover{background:var(--navy-700)}

/* 文章卡片 */
.article-card{display:flex;flex-direction:column;color:inherit;transition:transform .2s,box-shadow .2s,border-color .2s}
.article-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:0 12px 32px rgba(15,33,61,.12);border-color:#c5ece7}
.article-card h3{font-size:20px;line-height:1.45;margin-bottom:10px}
.article-card p{flex:1}

/* 系列子导航 */
.subnav-wrap{background:var(--white);border-bottom:1px solid var(--line);position:sticky;top:64px;z-index:5}
.subnav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;padding:10px 0}
.subnav::-webkit-scrollbar{display:none}
.subnav a{padding:8px 16px;border-radius:10px;color:var(--muted);font-size:15px;white-space:nowrap;display:flex;gap:8px;align-items:center}
.subnav a b{font-size:12px;color:#9aa8bc;font-weight:600}
.subnav a:hover{background:#f0f4fa;text-decoration:none;color:var(--navy-800)}
.subnav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-dark);font-weight:600}
.subnav a[aria-current="page"] b{color:var(--accent-dark)}

/* 上一篇/下一篇 */
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.pn{display:flex;flex-direction:column;gap:4px;padding:18px 22px;border:1px solid var(--line);border-radius:14px;background:var(--white);color:var(--navy-800);box-shadow:var(--shadow);min-width:0}
.pn:hover{text-decoration:none;border-color:var(--accent)}
.pn small{color:var(--muted);font-size:13px}
.pn span{font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pn.prev small::before{content:"← "}
.pn.next{text-align:right}.pn.next small::after{content:" →"}
.pn.empty{visibility:hidden}
.back-link{text-align:center;margin:24px 0 0;font-size:14.5px}

/* 新闻列表 */
.news-list{list-style:none;margin:0;padding:0;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.news-item{display:grid;grid-template-columns:44px 1fr;gap:12px;padding:24px 28px;border-bottom:1px solid var(--line)}
.news-item:last-child{border-bottom:none}
.news-no{font-family:var(--mono);font-size:14px;font-weight:700;color:var(--accent-dark);padding-top:3px}
.news-item h3{font-size:18px;line-height:1.5;margin:0 0 6px}
.news-item h3 a{color:var(--navy-800)}
.news-item h3 a:hover{color:var(--accent-dark)}
.news-item h3 a::after{content:" ↗";font-size:.8em;color:#9aa8bc}
.news-item p{margin:0;color:var(--muted)}
.news-src{display:inline-block;margin-top:8px;font-family:var(--mono);font-size:12.5px;color:#7f8ea5;background:#f3f6fa;padding:1px 8px;border-radius:6px;word-break:break-all}
.news-list.compact{box-shadow:none;border:none;border-top:1px solid var(--line);border-radius:0;margin:20px 0 24px}
.news-list.compact .news-item{padding:18px 0}
.news-list.compact .news-item h3{font-size:16.5px}

/* 归档 */
.archive-month{margin-bottom:36px}
.archive-month h2{font-size:15px;color:var(--muted);font-weight:600;letter-spacing:1px;margin:0 0 12px}
.archive-list{list-style:none;margin:0;padding:0;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.archive-list li+li{border-top:1px solid var(--line)}
.archive-row{display:grid;grid-template-columns:64px 1fr auto;gap:18px;align-items:center;padding:18px 24px;color:var(--ink)}
.archive-row:hover{background:#f7fafc;text-decoration:none}
.archive-row time{display:flex;flex-direction:column;line-height:1.25}
.archive-row time b{font-size:20px;color:var(--navy-800)}
.archive-row time small{font-size:12.5px;color:var(--muted)}
.archive-title{font-weight:600;color:var(--navy-800)}

/* 首页版块卡片 */
.section-card{display:flex;flex-direction:column}
.section-card-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:6px}
.section-card-head h3{font-size:21px;margin:0}
.section-card-head h3 a{color:var(--navy-800)}
.section-card::before{content:"";display:block;width:36px;height:4px;border-radius:4px;background:var(--accent);margin-bottom:18px}
.mini-list{list-style:none;margin:18px 0 20px;padding:0;flex:1}
.mini-list li{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-top:1px dashed var(--line);font-size:15px}
.mini-list li a{color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.mini-list li a:hover{color:var(--accent-dark)}
.mini-list time{color:#9aa8bc;font-size:13px;font-family:var(--mono);flex:none}
.brief-preview{padding:32px 36px}
.brief-preview h3{font-size:22px;margin:0 0 6px}
.brief-preview h3 a{color:var(--navy-800)}

@media (max-width:640px){
  .subnav-wrap{position:static}
  .prevnext{grid-template-columns:1fr}
  .pn.empty{display:none}
  .pn.next{text-align:left}
  .news-item{grid-template-columns:32px 1fr;padding:20px 18px}
  .archive-row{grid-template-columns:52px 1fr;padding:16px 18px}
  .archive-row .count{grid-column:2}
  .brief-preview{padding:22px}
  .list-head{flex-wrap:wrap}
}

/* ===== 品牌副标题 / 外链 / 归档高亮 ===== */
.brand-sep{color:#4d6386;font-weight:400;margin:0 2px}
.brand-sub{color:var(--accent);font-weight:600}
.nav a.ext::after,.footer-nav a.ext::after{content:" ↗";font-size:.85em;opacity:.7}
.section-card.external::before{background:linear-gradient(90deg,var(--accent),#5b8def)}
.site-host{display:inline-block;align-self:flex-start;font-family:var(--mono);font-size:12.5px;color:var(--accent-dark);background:var(--accent-soft);padding:1px 8px;border-radius:6px;margin-bottom:10px}
.hero-meta .chip.accent-chip{background:var(--accent);color:var(--navy-900);border-color:var(--accent);font-weight:600}
.archive-row[aria-current="page"]{background:var(--accent-soft)}
.family-note{margin:8px 0 0;text-align:center;font-size:14px;color:var(--muted)}
@media (max-width:640px){
  .brand{font-size:16px}
}