:root{
  --bg:#F3F6FB;--surface:#FFFFFF;--soft:#E6EEF6;--ink:#0B1F3A;--text:#1C3348;--muted:#4A6276;--faint:#7A8FA0;
  --brand:#0B3A6E;--blue:#1E6FBF;--cyan:#1396B3;--amber:#D97706;--coral:#E25B4C;--line:rgba(11,58,110,.16);
  --shadow:0 14px 34px rgba(7,20,40,.08);--radius:18px;--max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:16px;line-height:1.75;overflow-x:hidden;padding-top:136px}
body.overlay-lock{overflow:hidden}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible{outline:3px solid rgba(30,111,191,.32);outline-offset:3px}
button{font:inherit}
img{display:block;max-width:100%;height:auto}
.site-header{position:fixed;z-index:1000;top:0;left:0;right:0}
.wire-bar{height:30px;background:#071428;color:#fff}
.bar-inner,.beacon-inner,.channel-inner,.footer-inner{width:min(calc(100% - 32px),var(--max));margin:0 auto}
.bar-inner{height:30px;display:flex;align-items:center;justify-content:space-between;font-size:12px;letter-spacing:.04em}
.mini-brand{font-weight:800}
.icon-button{border:0;background:transparent;color:#fff;min-height:30px;padding:0 6px;cursor:pointer;font-weight:700}
.beacon-bar{height:62px;background:#fff;border-bottom:1px solid var(--line)}
.beacon-inner{height:62px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.round-menu{width:44px;height:44px;border:1px solid var(--line);border-radius:50%;background:#fff;display:grid;place-content:center;gap:4px;cursor:pointer}
.round-menu span{display:block;width:16px;height:2px;background:var(--brand);border-radius:2px}
.brand-lockup{justify-self:center;display:flex;align-items:center;justify-content:center;min-height:44px;min-width:80px;color:var(--brand);font-size:22px;letter-spacing:.08em}
.brand-logo{max-height:34px;width:auto}
.app-link{justify-self:end;min-height:44px;display:inline-flex;align-items:center;padding:0 18px;border-radius:999px;background:linear-gradient(135deg,#1E6FBF 0%,#0B3A6E 55%,#071428 100%);color:#fff;font-size:14px;font-weight:800}
.channel-bar{height:44px;background:#fff;border-bottom:1px solid var(--line)}
.channel-inner{height:44px;display:flex;align-items:stretch;justify-content:center;gap:34px}
.channel-inner a{height:44px;display:flex;align-items:center;position:relative;font-size:14px;color:var(--muted);font-weight:700}
.channel-inner a.active{color:var(--brand)}
.channel-inner a.active:after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--brand);border-radius:3px 3px 0 0}
.site-main{min-height:60vh}
.page-shell{width:min(calc(100% - 32px),var(--max));margin:0 auto;padding:46px 0 72px}
.page-hero{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;box-shadow:var(--shadow);margin-bottom:28px}
.eyebrow{display:flex;align-items:center;gap:8px;color:var(--brand);font-weight:800;font-size:13px;letter-spacing:.08em;text-transform:uppercase}
.eyebrow:before{content:"";width:9px;height:9px;background:var(--cyan);border-radius:50%}
h1,h2,h3{color:var(--ink);line-height:1.28;margin-top:0}
h1{font-size:clamp(28px,4vw,32px);margin:12px 0 16px;letter-spacing:-.02em}
h2{font-size:22px;margin-bottom:14px}h3{font-size:18px;margin-bottom:10px}
p{margin:0 0 14px}
.lead{font-size:17px;color:var(--muted);max-width:780px}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.btn-primary,.btn-secondary{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0 20px;border-radius:999px;font-weight:800}
.btn-primary{background:linear-gradient(135deg,#1E6FBF 0%,#0B3A6E 55%,#071428 100%);color:#fff}
.btn-secondary{background:#fff;color:var(--brand);border:1px solid var(--line)}
.content-section{margin-top:28px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:16px}.section-head p{margin:0;color:var(--muted);max-width:640px}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card-grid.two{grid-template-columns:repeat(2,1fr)}.card-grid.four{grid-template-columns:repeat(4,1fr)}
.card,.note-card,.term-card,.faq-item,.source-card,.pack-row,.signal-row,.board-item,.step-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 8px 20px rgba(7,20,40,.04)}
.card p,.note-card p,.term-card p,.source-card p,.step-card p{color:var(--muted)}
.tag-list{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.tag-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px}.tag-dot{width:9px;height:9px;border-radius:50%;margin-bottom:12px}.tag-item:nth-child(3n+1) .tag-dot{background:var(--brand)}.tag-item:nth-child(3n+2) .tag-dot{background:var(--cyan)}.tag-item:nth-child(3n+3) .tag-dot{background:var(--amber)}.tag-item p{font-size:14px;color:var(--muted)}.text-link{font-weight:800;color:var(--brand)}
.media-slot{background:linear-gradient(135deg,#eaf1f8,#dbe7f2);border:1px solid var(--line);border-radius:18px;min-height:180px;display:flex;align-items:center;justify-content:center;overflow:hidden}.media-slot.tall{min-height:240px}.media-slot img{width:100%;height:auto;max-height:340px;object-fit:contain}
.hero-banner{margin-top:24px;min-height:180px}.hero-banner img{width:100%;max-height:340px;object-fit:contain}
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:22px;align-items:stretch}
.number-list{display:grid;gap:12px}.signal-row{display:grid;grid-template-columns:62px 1fr;gap:16px;align-items:start}.num{font-size:30px;font-weight:900;color:var(--brand);line-height:1}.signal-row p{margin-bottom:6px;color:var(--muted)}
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.topic-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px}.topic-card span{display:inline-block;color:#fff;background:var(--brand);border-radius:999px;padding:2px 9px;font-size:12px;margin-bottom:10px}
.pack-list{display:grid;gap:12px}.pack-row{display:grid;grid-template-columns:120px 1fr auto;gap:18px;align-items:center}.pack-label{font-weight:900;color:var(--brand)}.pack-row p{margin:0;color:var(--muted)}.pack-row a{font-weight:800;color:var(--brand)}
.board-list{display:grid;gap:14px}.board-item{display:grid;grid-template-columns:82px 1fr;gap:20px}.board-number{font-size:44px;font-weight:950;color:var(--brand);line-height:1}
.timeline{position:relative;margin-left:14px;padding-left:28px}.timeline:before{content:"";position:absolute;left:5px;top:8px;bottom:8px;width:2px;background:var(--line)}.timeline-item{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;margin-bottom:14px}.timeline-item:before{content:"";position:absolute;left:-29px;top:26px;width:12px;height:12px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 5px var(--bg)}.status{display:inline-flex;min-height:28px;align-items:center;padding:0 10px;border-radius:999px;background:var(--soft);color:var(--brand);font-size:12px;font-weight:800;margin-bottom:10px}
.prose{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;box-shadow:var(--shadow)}.prose h2{margin-top:28px}.prose h2:first-child{margin-top:0}.prose p{color:var(--text)}.prose ul{padding-left:1.2em}.prose li{margin-bottom:8px}
.index-wrap{width:min(calc(100% - 32px),var(--max));margin:0 auto;padding:34px 0 72px}.signal-cover{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;box-shadow:var(--shadow)}.signal-cover h1{max-width:760px}.signal-cover .lead{max-width:820px}
.faq-list{display:grid;gap:14px}.faq-item h2{font-size:18px;margin-bottom:8px}.faq-item p{margin:0;color:var(--muted)}
.notice{border-left:4px solid var(--amber);background:#fff;border-radius:0 16px 16px 0;padding:18px 20px;border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted)}
.brand-statement{display:grid;grid-template-columns:.8fr 1.2fr;gap:20px}.brand-statement .brand-panel{background:#071428;color:#fff;border-radius:18px;padding:28px}.brand-statement .brand-panel h2,.brand-statement .brand-panel p{color:#fff}.brand-statement .brand-copy{background:#fff;border:1px solid var(--line);border-radius:18px;padding:28px}
.site-footer{background:#071428;color:#D5E4F4;padding:48px 0 74px}.footer-brand{display:flex;align-items:center;gap:14px;margin-bottom:30px}.footer-brandmark{min-width:58px;min-height:44px;display:flex;align-items:center}.footer-logo{max-height:34px;width:auto}.footer-brand div{display:flex;flex-direction:column}.footer-brand strong{font-size:20px;color:#fff}.footer-brand span{font-size:12px;letter-spacing:.18em}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:26px 0;border-top:1px solid rgba(213,228,244,.16);border-bottom:1px solid rgba(213,228,244,.16)}.footer-groups h2{font-size:14px;color:#fff;margin-bottom:12px}.footer-groups a{display:block;color:#D5E4F4;margin:7px 0;font-size:14px}.footer-note,.copyright{color:#9fb4c8;font-size:13px;max-width:900px}.footer-note{margin-top:24px}.copyright{margin-bottom:0}
.site-mask{position:fixed;inset:0;background:rgba(7,20,40,.42);z-index:1200;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.site-mask.open{opacity:1;visibility:visible;pointer-events:auto}
.band-menu{position:fixed;z-index:1300;top:42px;left:50%;width:min(700px,94%);max-height:calc(100vh - 70px);overflow:auto;transform:translate(-50%,-18px);opacity:0;visibility:hidden;pointer-events:none;background:#fff;border-radius:20px;border:1px solid var(--line);box-shadow:var(--shadow);padding:22px;transition:.22s}.band-menu.open{transform:translate(-50%,0);opacity:1;visibility:visible;pointer-events:auto}.menu-head,.search-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:14px;border-bottom:1px solid var(--line)}.menu-brand{display:flex;align-items:center;gap:10px;color:var(--brand);font-weight:900}.menu-logo{max-height:28px;width:auto}.plain-close{border:1px solid var(--line);background:#fff;color:var(--brand);border-radius:999px;min-height:40px;padding:0 14px;cursor:pointer;font-weight:800}.menu-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:18px}.menu-grid h2{font-size:14px;margin:0 0 8px;color:var(--brand)}.menu-grid a{display:block;padding:10px 0;border-bottom:1px solid rgba(11,58,110,.08)}.menu-grid strong{display:block;color:var(--ink);font-size:15px}.menu-grid span{display:block;color:var(--muted);font-size:12px;line-height:1.55;margin-top:2px}
.search-layer{position:fixed;z-index:1300;top:92px;left:0;right:0;opacity:0;visibility:hidden;pointer-events:none;transition:.2s}.search-layer.open{opacity:1;visibility:visible;pointer-events:auto}.search-card{width:min(680px,calc(100% - 32px));margin:0 auto;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:18px;padding:20px}.search-shell{min-height:54px;border:1px solid var(--line);border-radius:999px;margin:18px 0;display:flex;align-items:center;padding:0 20px;color:var(--faint);background:var(--bg)}.search-presets{display:flex;gap:10px;flex-wrap:wrap}.search-presets a{min-height:40px;display:inline-flex;align-items:center;padding:0 14px;border-radius:999px;background:var(--soft);color:var(--brand);font-weight:800;font-size:13px}
.mobile-nav{display:none}
@media (max-width:900px){.card-grid.four,.tag-list{grid-template-columns:repeat(2,1fr)}.card-grid,.topic-grid{grid-template-columns:repeat(2,1fr)}.split,.brand-statement{grid-template-columns:1fr}.pack-row{grid-template-columns:100px 1fr}.pack-row a{grid-column:2}.footer-groups{grid-template-columns:repeat(2,1fr)}}
@media (max-width:700px){body{padding-top:92px;padding-bottom:calc(50px + env(safe-area-inset-bottom))}.channel-bar{display:none}.bar-inner,.beacon-inner,.channel-inner,.footer-inner,.page-shell,.index-wrap{width:calc(100% - 32px)}.app-link{padding:0 12px;font-size:13px}.beacon-inner{grid-template-columns:44px minmax(80px,1fr) auto}.brand-lockup{min-width:0}.page-shell{padding-top:28px}.page-hero,.signal-cover,.prose{padding:22px}.card-grid,.card-grid.two,.card-grid.four,.topic-grid,.tag-list{grid-template-columns:1fr}.section-head{align-items:start;flex-direction:column;gap:4px}.signal-row{grid-template-columns:48px 1fr}.board-item{grid-template-columns:64px 1fr}.board-number{font-size:36px}.pack-row{grid-template-columns:1fr;gap:8px}.pack-row a{grid-column:auto}.menu-grid{grid-template-columns:1fr}.band-menu{top:34px;max-height:calc(100vh - 48px)}.search-layer{top:30px;bottom:0;background:var(--bg);overflow:auto}.search-card{width:100%;min-height:100%;border:0;border-radius:0;box-shadow:none;padding:24px 16px 90px}.footer-groups{grid-template-columns:repeat(2,1fr);gap:18px}.site-footer{padding-bottom:90px}.mobile-nav{position:fixed;z-index:1100;left:0;right:0;bottom:0;height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);display:grid;grid-template-columns:repeat(5,1fr);background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(7,20,40,.06)}.mobile-nav a{height:50px;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--muted);font-weight:800}.mobile-nav a.active{color:var(--brand)}.site-mask.open{z-index:1200}}
@media (max-width:420px){.footer-groups{grid-template-columns:1fr 1fr}.app-link{padding:0 10px}.brand-lockup{font-size:20px}.page-hero,.signal-cover{padding:20px}}
/* 可点击元素保持清晰的触控区域 */
.plain-close,.search-presets a,.text-link,.menu-brand{min-height:44px}
.text-link,.menu-brand{display:inline-flex;align-items:center}
.footer-groups a{min-height:44px;display:flex;align-items:center;margin:0}