/* ============================================================
   kaifaai.app 资讯页共用样式 — 与主站(index.html)同一套设计语言
   字体 / 色板 / 头部 / 卡片 / 圆角 / 阴影 / 暗色默认 全部对齐
   ============================================================ */
:root{
  --violet:#0B63E5; --indigo:#0891B2; --violet-light:#EEF6FE; --violet-mid:#DCEBFB;
  --ink:#0E1B2B; --gray:#5C7086; --line:#E2EAF4; --green:#059669;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--ink);background:#fff;line-height:1.6}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
a{color:inherit;text-decoration:none}

/* ---- header：与主站完全一致 ---- */
header{position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);z-index:100}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px}
.brand img{width:36px;height:36px;border-radius:9px}
.brand span small{font-size:12px;color:var(--gray);font-weight:500;display:block;line-height:1.1}
.nav-links{display:flex;gap:28px;font-size:15px;color:#444}
.nav-links a:hover{color:var(--violet)}
.nav-links a.on{color:var(--violet);font-weight:600}
.btn{display:inline-block;background:linear-gradient(135deg,var(--violet),var(--indigo));color:#fff;padding:11px 26px;border-radius:10px;font-weight:600;font-size:15px;border:none;cursor:pointer}
.btn:hover{opacity:.92}
.burger{display:none;background:none;border:none;font-size:24px;cursor:pointer;color:var(--ink);padding:6px}
.mobile-menu{display:none;position:fixed;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 12px 30px rgba(0,0,0,.08);z-index:99;padding:12px 24px 20px}
.mobile-menu.open{display:block}
.mobile-menu a{display:block;padding:13px 4px;font-size:16px;border-bottom:1px solid var(--line)}
.mobile-menu a:last-child{border-bottom:none;color:var(--violet);font-weight:700}
@media(max-width:820px){.nav-links{display:none}.burger{display:block}}

/* ---- 页头 hero：与主站 hero 同款 ---- */
.page-hero{padding:84px 0 52px;background:linear-gradient(180deg,var(--violet-light) 0%,#fff 100%);text-align:center}
.page-hero .tag{display:inline-block;background:#fff;border:1px solid var(--violet-mid);color:var(--violet);font-size:13px;font-weight:600;padding:6px 16px;border-radius:999px;margin-bottom:22px}
.page-hero h1{font-size:42px;line-height:1.25;font-weight:800;letter-spacing:-.5px}
.page-hero h1 em{font-style:normal;background:linear-gradient(135deg,var(--violet),var(--indigo));-webkit-background-clip:text;background-clip:text;color:transparent}
.page-hero p.sub{max-width:720px;margin:18px auto 0;color:var(--gray);font-size:17px}

/* ---- 区块标题：与主站 .cat-title 同款 ---- */
.cat-title{display:flex;align-items:center;gap:12px;margin:48px 0 20px;font-size:21px;font-weight:800}
.cat-title .dot{width:10px;height:26px;border-radius:5px;background:linear-gradient(180deg,var(--violet),var(--indigo))}
.cat-title small{color:var(--gray);font-weight:500;font-size:14px}

/* ---- 卡片：与主站 .card 同款 ---- */
.card-list{display:flex;flex-direction:column;gap:14px}
.ac{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px 24px;text-decoration:none;color:var(--ink);transition:.18s}
.ac:hover{border-color:var(--violet);box-shadow:0 8px 28px rgba(11,99,229,.10);transform:translateY(-3px)}
.ac h3{font-size:17px;line-height:1.5;margin-bottom:6px;font-weight:700}
.ac p{color:var(--gray);font-size:13.5px}
.ac small{display:block;margin-top:10px;color:#8A99AC;font-size:12px}
.ac .go{color:var(--violet);font-weight:600;font-size:13.5px}

/* ---- 快讯：与主站 .filters / .nc 同款 ---- */
.news-tabs{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:0 0 22px}
.news-tabs button{padding:8px 18px;border-radius:999px;border:1px solid #D6E8FB;background:#fff;color:#063A7A;font-weight:600;font-size:14px;cursor:pointer;transition:.2s}
.news-tabs button.on{background:var(--violet);color:#fff;border-color:var(--violet)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.nc{background:#fff;border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:8px;cursor:pointer;transition:.18s}
.nc:hover{border-color:var(--violet);box-shadow:0 8px 28px rgba(11,99,229,.10);transform:translateY(-3px)}
.nc .tag{align-self:flex-start;font-size:11.5px;font-weight:700;border-radius:6px;padding:2px 8px;background:var(--violet-light);color:var(--violet)}
.nc h4{font-size:15.5px;line-height:1.55;color:var(--ink)}
.nc p{font-size:13.5px;color:var(--gray);line-height:1.7}
.nc .more{display:none;font-size:13px;color:var(--violet);line-height:1.8;border-top:1px dashed var(--line);margin-top:6px;padding-top:10px}
.nc.open .more{display:block}
.nc small{color:#8A99AC;font-size:12px;margin-top:auto}
.nc .when{margin-left:auto}

/* ---- 作者 ---- */
@keyframes kfFade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.author-card{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;margin:30px 0}
.author-av{flex-shrink:0}
.author-av img{width:64px;height:64px;border-radius:50%;object-fit:cover;border:2px solid var(--violet-mid);display:block}
.author-info{flex:1}
.author-info .an{font-weight:800;font-size:16px}
.author-info .ar{color:var(--violet);font-size:13px;font-weight:600;margin-top:2px}
.author-info .ab{font-size:13px;color:var(--gray);margin-top:8px;line-height:1.75}
.author-info .alink{display:inline-block;margin-top:10px;color:var(--violet);font-weight:600;font-size:13.5px}
.ac .by{display:inline-block;margin-top:8px;font-size:12px;color:var(--violet);background:var(--violet-light);border-radius:6px;padding:2px 8px;font-weight:600}
.p-empty{text-align:center;color:#8A99AC;padding:24px 0;font-size:14px}
.ahead{display:flex;gap:18px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;margin-bottom:22px}
.ahead img{width:88px;height:88px;border-radius:50%;object-fit:cover;border:3px solid var(--violet-mid);flex-shrink:0}
.ahead h2{font-size:20px;font-weight:800}
.ahead .role{color:var(--violet);font-weight:600;font-size:13.5px;margin-top:3px}
.ahead .bio{font-size:13.5px;color:var(--gray);margin-top:8px;line-height:1.75}
body.dark .author-card,body.dark .ahead{background:#111e2c;border-color:#1E2F42}
body.dark .ac .by{background:rgba(34,160,224,.16);color:#9BD5F7}
@media(max-width:640px){.author-card{flex-direction:column}.ahead{flex-direction:column;text-align:center}}

/* ---- 文章正文 ---- */
.article{max-width:760px;margin:0 auto;padding:56px 24px 70px}
.article .kicker{color:var(--violet);font-weight:700;font-size:14px;letter-spacing:2px;text-transform:uppercase}
.article h1{font-size:30px;line-height:1.4;margin:12px 0 14px;font-weight:800;letter-spacing:-.3px}
.art-meta{color:#8A99AC;font-size:13px;margin-bottom:30px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.article h2{font-size:20px;margin:36px 0 12px;font-weight:800}
.article p{margin:14px 0;font-size:15.5px;line-height:1.9}
.article ul{margin:14px 0 14px 22px;font-size:15px}
.article li{margin:8px 0}
.article strong{color:var(--violet);font-weight:700}
.callout{background:var(--violet-light);border-left:3px solid var(--violet);border-radius:0 10px 10px 0;padding:14px 18px;margin:22px 0;font-size:14.5px;color:#063A7A}
.back{display:inline-block;margin-top:40px;color:var(--violet);font-weight:600;font-size:14px}
.back:hover{opacity:.8}

/* ---- footer：与主站同款 ---- */
footer{padding:44px 0 34px;text-align:center;color:#8A99AC;font-size:13.5px;border-top:1px solid var(--line)}
footer .links{margin-bottom:12px;display:flex;gap:22px;justify-content:center;flex-wrap:wrap}
footer a:hover{color:var(--violet)}

/* ---- 主题切换按钮：与主站同款 ---- */
.theme-fab{position:fixed;right:22px;top:90px;z-index:900;width:44px;height:44px;border-radius:50%;border:1px solid #D6E8FB;background:#fff;box-shadow:0 4px 14px rgba(11,99,229,.15);cursor:pointer;font-size:19px;line-height:42px;text-align:center}

/* ---- 移动端底部 CTA 条：与主站同款 ---- */
.sticky-cta{display:none;position:fixed;left:0;right:0;bottom:0;z-index:119;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:9px 14px calc(9px + env(safe-area-inset-bottom));gap:10px}
.sticky-cta .sbtn{flex:1;text-align:center;padding:12px 0;border-radius:10px;font-weight:700;font-size:15px}
.sticky-cta .sbtn.wechat{background:var(--violet-light);color:var(--violet)}
.sticky-cta .sbtn.quote{background:linear-gradient(135deg,var(--violet),var(--indigo));color:#fff}

/* ============================================================
   暗色模式（默认）：覆盖规则与主站逐条对应
   ============================================================ */
body.dark{--violet:#6FC0F0;--ink:#DDE5EF;--gray:#8A99AC;background:#08131F;color:#DDE5EF}
body.dark header{background:rgba(11,11,20,.9);border-bottom-color:#1E2F42}
body.dark .nav-links{color:#9BD5F7}
body.dark .nav-links a:hover{color:#9BD5F7}
body.dark .nav-links a.on{color:#9BD5F7}
body.dark .burger{color:#DDE5EF}
body.dark .mobile-menu{background:#111e2c;border-bottom-color:#1E2F42;box-shadow:0 12px 30px rgba(0,0,0,.4)}
body.dark .mobile-menu a{border-bottom-color:#1E2F42}
body.dark .mobile-menu a:last-child{color:#9BD5F7}
body.dark .btn{background:linear-gradient(135deg,#2E9BE6,#0891B2);color:#fff}
body.dark .page-hero{background:linear-gradient(180deg,#0E2033 0%,#08131F 100%)}
body.dark .page-hero .tag{background:#111e2c;border-color:#1E2F42;color:#9BD5F7}
body.dark .cat-title small{color:#8A99AC}
body.dark .ac,body.dark .nc{background:#111e2c;border-color:#1E2F42}
body.dark .ac:hover,body.dark .nc:hover{border-color:#2E9BE6;box-shadow:0 8px 28px rgba(34,160,224,.18)}
body.dark .ac h3,body.dark .nc h4{color:#DDE5EF}
body.dark .ac p,body.dark .nc p{color:#8A99AC}
body.dark .ac small,body.dark .nc small{color:#5C7086}
body.dark .ac .go{color:#9BD5F7}
body.dark .news-tabs button{background:#111e2c;border-color:#1E2F42;color:#9BD5F7}
body.dark .news-tabs button.on{background:#2E9BE6;color:#fff;border-color:#2E9BE6}
body.dark .nc .tag{background:rgba(34,160,224,.16);color:#9BD5F7}
body.dark .nc .more{color:#9BD5F7;border-top-color:#1E2F42}
body.dark .art-meta{color:#5C7086;border-bottom-color:#1E2F42}
body.dark .article strong{color:#9BD5F7}
body.dark .callout{background:rgba(34,160,224,.12);color:#CDE8FB;border-left-color:#2E9BE6}
body.dark .back{color:#9BD5F7}
body.dark footer{border-top-color:#1E2F42}
body.dark footer a:hover{color:#9BD5F7}
body.dark .theme-fab{background:#111e2c;border-color:#1E2F42}
body.dark .sticky-cta{background:rgba(11,11,20,.96);border-top-color:#1E2F42}
body.dark .sticky-cta .sbtn.wechat{background:#16263A;color:#9BD5F7}

@media(max-width:640px){
  .page-hero h1{font-size:30px}
  .page-hero{padding:60px 0 40px}
  .article h1{font-size:23px}
  .grid{grid-template-columns:1fr}
}
/* 媒体查询放最后，避免被基础规则覆盖（与主站同款踩坑修复） */
@media(max-width:820px){
  .sticky-cta{display:flex}
}

/* ===== v17: skip link 默认隐藏，仅键盘聚焦时出现 ===== */
.skip{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip:focus{position:fixed;left:12px;top:12px;width:auto;height:auto;margin:0;overflow:visible;clip:auto;z-index:999;background:var(--violet);color:#fff;padding:10px 18px;border-radius:0 0 10px 0}