:root{--bg:#F5FAFE;--deep:#E7F2FA;--card:#FFFFFF;--sub:#D7EAF6;--title:#16324A;--text:#2A4156;--muted:#4E6A80;--quiet:#6E8899;--blue:#4AA3E0;--bright:#6BB8EC;--dark:#1B4A6E;--mist:#EAF5FC;--border:rgba(74,163,224,.16);--border-strong:rgba(74,163,224,.42);--shadow:0 12px 28px rgba(27,74,110,.08);--radius:12px}*{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:15px;line-height:1.7;overflow-x:hidden}body.layer-open{overflow:hidden}a{color:var(--dark);text-decoration:none}a:hover{text-decoration:none}button,input{font:inherit}.shell{width:min(1120px,calc(100% - 32px));margin:0 auto}.skip-link{position:fixed;left:16px;top:-60px;z-index:200;background:#fff;color:var(--dark);padding:10px 14px;border-radius:8px}.skip-link:focus{top:8px}.topline{position:fixed;inset:0 0 auto 0;height:22px;background:var(--dark);color:#fff;z-index:90;font-size:12px}.topline-inner{height:22px;display:flex;align-items:center;justify-content:space-between}.plain-action{border:0;background:transparent;color:#fff;min-width:44px;height:22px;cursor:pointer}.masthead{position:fixed;left:0;right:0;top:22px;height:60px;background:#fff;border-bottom:1px solid var(--border);z-index:90}.masthead-inner{height:60px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}.brand-mark{justify-self:start;display:flex;align-items:center;min-height:44px;font-size:22px;font-weight:800;color:var(--dark)}.brand-mark img,.drawer-brand img,.footer-brand img{height:28px;width:auto;max-width:140px;object-fit:contain;object-position:center}.drawer-trigger,.app-link{min-height:44px;display:inline-flex;align-items:center;justify-content:center;border-radius:10px}.drawer-trigger{justify-self:center;padding:0 18px;border:1px solid var(--border-strong);background:#fff;color:var(--dark);cursor:pointer}.app-link{justify-self:end;padding:0 16px;background:linear-gradient(135deg,#6BB8EC 0%,#4AA3E0 55%,#1B4A6E 100%);color:#fff;font-size:14px}.section-tabs{position:fixed;left:0;right:0;top:82px;height:40px;background:var(--mist);border-bottom:1px solid var(--border);z-index:80}.section-tabs-inner{height:40px;display:flex;align-items:center;justify-content:center;gap:8px}.tab{height:30px;min-width:72px;padding:0 16px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;font-size:13px;color:var(--dark)}.tab.is-current{background:var(--blue);color:#fff}.site-main{padding-top:150px;padding-bottom:54px}.page-hero{margin-bottom:28px}.eyebrow{margin:0 0 6px;color:var(--blue);font-size:13px;font-weight:800;letter-spacing:.08em}.page-hero h1{margin:0;color:var(--title);font-size:24px;line-height:1.3}.page-hero .lede{max-width:820px;margin:12px 0 0;color:var(--muted)}h2{font-size:20px;line-height:1.35;color:var(--title);margin:0 0 12px}h3{font-size:16px;line-height:1.4;color:var(--title);margin:0 0 8px}p{margin:0 0 12px}.section{padding:26px 0}.section + .section{border-top:1px solid var(--border)}.panel{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.hero-cover{overflow:hidden}.image-slot{background:var(--mist);border:1px solid var(--border);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden}.image-slot img{display:block;width:100%;height:100%;object-fit:contain;object-position:center}.banner-slot{width:100%;height:260px;border-radius:0;border:0;border-bottom:1px solid var(--border)}.cover-copy{padding:26px}.brandline{font-size:13px;color:var(--blue);font-weight:800}.cover-copy h1{font-size:24px;line-height:1.3;margin:6px 0 12px;color:var(--title)}.cover-copy p{max-width:800px;color:var(--muted)}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.btn{min-height:42px;padding:0 18px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;font-size:14px;font-weight:700}.btn-primary{background:linear-gradient(135deg,#6BB8EC 0%,#4AA3E0 55%,#1B4A6E 100%);color:#fff}.btn-secondary{background:#fff;color:var(--dark);border:1px solid var(--border-strong)}.cards-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.story-card{overflow:hidden}.story-card .image-slot{height:180px;border-radius:0;border:0;border-bottom:1px solid var(--border)}.story-card .body{padding:18px}.story-card p{color:var(--muted)}.issue-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(260px,.8fr);gap:22px;align-items:start}.issue-copy{padding:24px}.issue-copy .number-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:18px 0}.number-list a,.shelf-list a,.index-list a{background:var(--mist);border:1px solid var(--border);border-radius:10px;padding:12px;display:flex;gap:10px;align-items:flex-start}.number-list b,.obs-num{color:var(--blue);font-size:18px}.issue-image{height:200px}.shelf-list{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.shelf-list a{min-height:110px;flex-direction:column}.observation-list{display:grid;gap:10px}.observation-item{display:grid;grid-template-columns:48px 1fr;gap:12px;align-items:start;padding:16px;background:#fff;border:1px solid var(--border);border-radius:12px}.timeline{position:relative;margin-left:10px;padding-left:24px;border-left:2px solid var(--sub)}.timeline-item{position:relative;padding:0 0 22px 4px}.timeline-item:before{content:"";position:absolute;left:-31px;top:7px;width:12px;height:12px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 5px var(--mist)}.status{display:inline-flex;align-items:center;min-height:26px;padding:0 10px;border-radius:999px;background:var(--mist);color:var(--dark);font-size:12px;margin-bottom:6px}.note-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.note-card{padding:18px}.app-panel{display:grid;grid-template-columns:minmax(220px,.7fr) minmax(0,1.3fr);gap:24px;padding:24px}.app-image{height:360px}.app-icon{width:48px;height:48px;border-radius:10px;background:var(--mist);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;margin-bottom:12px}.app-icon img{width:48px;height:48px;object-fit:contain}.faq-mini{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.faq-mini article,.qa-item{background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px}.content-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.content-card{padding:18px}.content-card p{color:var(--muted)}.wide-card{padding:22px;margin-bottom:16px}.numbered{counter-reset:item;display:grid;gap:12px}.numbered article{counter-increment:item;background:#fff;border:1px solid var(--border);border-radius:12px;padding:18px}.numbered article:before{content:counter(item,decimal-leading-zero);display:block;color:var(--blue);font-size:24px;font-weight:800;margin-bottom:8px}.article-prose{max-width:860px}.article-prose p{margin-bottom:16px}.figure-row{display:grid;grid-template-columns:320px 1fr;gap:22px;align-items:start}.figure-row .image-slot{height:220px}.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.tag{display:inline-flex;align-items:center;min-height:30px;padding:0 10px;border-radius:999px;background:var(--mist);color:var(--dark);font-size:12px}.index-list{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.index-list a{min-height:86px;flex-direction:column}.terms{display:grid;gap:14px}.terms section{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px}.qa-list{display:grid;gap:12px}.qa-item h2{font-size:16px;margin-bottom:8px}.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.site-footer{background:var(--dark);color:#E7F2FA;border-top:1px solid rgba(234,245,252,.3);font-size:13px}.footer-top{padding:34px 0 24px;display:grid;grid-template-columns:220px 1fr;gap:34px}.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:6px}.footer-brand strong{font-size:18px;color:#fff}.footer-brand span{color:#E7F2FA}.footer-groups{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.footer-groups h2{font-size:13px;color:#fff;margin:0 0 8px}.footer-groups a{display:block;color:#E7F2FA;padding:4px 0}.footer-note{padding:18px 0 28px;border-top:1px solid rgba(234,245,252,.18);color:#E7F2FA}.footer-note p{margin:0 0 6px}.scrim{position:fixed;inset:0;background:rgba(22,50,74,.34);opacity:0;visibility:hidden;pointer-events:none;transition:.2s;z-index:100}.scrim.is-open{opacity:1;visibility:visible;pointer-events:auto}.site-drawer{position:fixed;right:0;top:0;bottom:0;width:min(400px,86vw);background:#fff;z-index:110;transform:translateX(104%);visibility:hidden;pointer-events:none;transition:transform .24s ease,visibility .24s;box-shadow:-20px 0 40px rgba(27,74,110,.15)}.site-drawer.is-open{transform:translateX(0);visibility:visible;pointer-events:auto}.drawer-head{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--border)}.drawer-brand{display:flex;align-items:center;gap:10px}.close-button{min-height:44px;min-width:60px;border:1px solid var(--border-strong);border-radius:10px;background:#fff;color:var(--dark);cursor:pointer}.drawer-scroll{height:calc(100% - 64px);overflow-y:auto;padding:16px 18px 30px}.drawer-scroll section{padding:10px 0 16px}.drawer-scroll section + section{border-top:1px solid var(--border)}.drawer-scroll h2{font-size:13px;color:var(--quiet);margin-bottom:8px}.drawer-scroll a{display:block;padding:11px 0;border-bottom:1px dashed var(--border)}.drawer-scroll b{display:block;color:var(--title);font-size:14px}.drawer-scroll span{display:block;color:var(--muted);font-size:12px;line-height:1.55;margin-top:2px}.search-layer{position:fixed;left:0;right:0;top:82px;z-index:105;visibility:hidden;opacity:0;pointer-events:none;transition:.2s}.search-layer.is-open{visibility:visible;opacity:1;pointer-events:auto}.search-card{width:min(760px,calc(100% - 32px));margin:14px auto;background:#fff;border:1px solid var(--border-strong);border-radius:14px;box-shadow:var(--shadow);padding:18px}.search-head{display:flex;justify-content:space-between;align-items:center;gap:10px}.search-card label{display:block;margin:10px 0 6px;color:var(--muted)}.search-card input{width:100%;height:44px;border:1px solid var(--border-strong);border-radius:10px;padding:0 12px;background:var(--mist);color:var(--title);outline:none}.search-presets{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.search-presets a{min-height:40px;padding:0 14px;border-radius:9px;background:var(--mist);display:inline-flex;align-items:center;color:var(--dark)}.search-empty{margin-top:12px;color:var(--muted)}.mobile-bottom{display:none}.btn:focus-visible,.tab:focus-visible,.drawer-trigger:focus-visible,.app-link:focus-visible,.plain-action:focus-visible,.close-button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid rgba(107,184,236,.45);outline-offset:2px}@media(max-width:860px){.site-main{padding-top:112px;padding-bottom:88px}.section-tabs{display:none}.cards-3,.note-grid,.content-grid,.contact-grid{grid-template-columns:1fr}.shelf-list{grid-template-columns:repeat(2,1fr)}.issue-grid,.app-panel,.figure-row{grid-template-columns:1fr}.issue-image,.figure-row .image-slot{height:220px}.app-image{height:320px}.footer-top{grid-template-columns:1fr}.footer-groups{grid-template-columns:repeat(2,1fr)}.mobile-bottom{position:fixed;left:0;right:0;bottom:0;height:calc(48px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:#fff;border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(5,1fr);z-index:70}.mobile-bottom a{min-height:48px;display:flex;align-items:center;justify-content:center;font-size:12px;color:var(--dark)}.mobile-bottom a.is-current{background:var(--blue);color:#fff}.search-layer{top:0;bottom:0;background:var(--dark);color:#fff}.search-card{width:100%;height:100%;margin:0;border:0;border-radius:0;background:var(--dark);box-shadow:none;padding:calc(22px + env(safe-area-inset-top)) 16px 24px}.search-card label,.search-empty{color:#E7F2FA}.search-card input{background:#fff;color:var(--title)}.search-presets a{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.2)}.search-head strong{color:#fff}.search-head .close-button{background:#fff}.faq-mini{grid-template-columns:1fr}}@media(max-width:560px){.shell{width:calc(100% - 32px)}.masthead-inner{grid-template-columns:minmax(72px,1fr) auto minmax(72px,1fr);gap:6px}.brand-mark{font-size:20px}.brand-mark img{max-width:92px}.drawer-trigger{padding:0 12px}.app-link{padding:0 10px;font-size:13px}.banner-slot{height:260px}.cover-copy{padding:20px 16px}.issue-copy{padding:18px}.number-list{grid-template-columns:1fr}.shelf-list{grid-template-columns:1fr}.app-panel{padding:18px}.footer-groups{grid-template-columns:1fr 1fr;gap:18px}.index-list{grid-template-columns:1fr}}