:root{--bg:#F3F6F9;--deep:#FFFFFF;--panel:#FFFFFF;--soft:#E8EEF5;--title:#0B1220;--text:#1E293B;--muted:#475569;--sub:#64748B;--blue:#2563EB;--blue2:#60A5FA;--blue3:#1D4ED8;--lime:#65A30D;--slate:#334155;--line:rgba(37,99,235,.16);--shadow:0 14px 36px rgba(11,18,32,.08);--radius:18px;--header:136px}
*{box-sizing:border-box}html{scroll-behavior:smooth}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;line-height:1.75;overflow-x:hidden}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}.shell{width:min(1180px,calc(100% - 32px));margin:0 auto}.site-header{position:fixed;inset:0 0 auto;z-index:50}.status-bar{height:32px;background:var(--slate);color:#fff}.status-inner{height:32px;display:flex;align-items:center;justify-content:space-between;font-size:13px}.status-brand{font-weight:700;letter-spacing:.04em}.icon-text-btn,.close-btn{border:0;background:none;color:inherit;font:inherit;cursor:pointer;min-height:44px;padding:0 10px}.status-bar .icon-text-btn{min-height:32px}.command-bar{height:60px;background:#fff;border-bottom:1px solid var(--line)}.command-inner{height:60px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center}.square-btn{width:44px;height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;display:grid;place-content:center;gap:4px;cursor:pointer}.square-btn span{display:block;width:18px;height:2px;background:var(--title);border-radius:2px}.brand-mark{justify-self:center;display:flex;align-items:center;min-height:44px;color:var(--title);font-size:22px;letter-spacing:.04em}.brand-mark-image{max-height:32px;width:auto}.app-link{justify-self:end;display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border-radius:999px;background:linear-gradient(135deg,#60A5FA 0%,#2563EB 52%,#1D4ED8 100%);color:#fff;font-weight:700}.desktop-tabs{height:44px;background:#fff;border-bottom:1px solid var(--line)}.tab-inner{height:44px;display:grid;grid-template-columns:repeat(6,1fr);align-items:stretch}.tab-inner 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@media (max-width:900px){.numbered-grid,.quad-grid{grid-template-columns:repeat(2,1fr)}.three-grid,.step-grid{grid-template-columns:1fr 1fr}.content-columns,.product-showcase,.footer-top{grid-template-columns:1fr}.split-card{grid-template-columns:1fr}.split-card .image-wrap{min-height:210px}.footer-brand{max-width:none}.mosaic-grid{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:680px){:root{--header:92px}.desktop-tabs{display:none}.site-main{padding-top:calc(var(--header) + 18px);padding-bottom:66px}.status-brand{font-size:12px}.command-inner{grid-template-columns:72px 1fr 92px}.brand-mark{font-size:20px}.app-link{padding:0 12px;font-size:13px}.page-hero{padding:24px 0 14px}.cover-copy{padding:24px 20px}.theme-list,.three-grid,.step-grid,.numbered-grid,.quad-grid{grid-template-columns:1fr}.topic-row{grid-template-columns:auto 1fr}.topic-row a{grid-column:2}.file-row{grid-template-columns:1fr;gap:4px}.big-number-item{grid-template-columns:64px 1fr}.big-number-item .num{font-size:38px}.content-columns{grid-template-columns:1fr}.product-showcase{grid-template-columns:1fr}.product-visual .image-slot{min-height:300px}.search-layer{top:0;bottom:0;background:var(--bg);overflow:auto}.search-card{width:100%;min-height:100%;margin:0;border:0;border-radius:0;box-shadow:none;padding:calc(16px + env(safe-area-inset-top)) 16px 80px}.mobile-bottom{display:grid;position:fixed;z-index:60;left:0;right:0;bottom:0;height:calc(50px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);grid-template-columns:repeat(5,1fr);background:#fff;border-top:1px solid var(--line)}.mobile-bottom a{display:flex;align-items:center;justify-content:center;min-height:50px;font-size:12px;color:var(--muted)}.mobile-bottom a.is-active{color:var(--blue);font-weight:800}.site-footer{padding-bottom:100px}.footer-grid{grid-template-columns:1fr 1fr;gap:18px}.mosaic-head{height:64px}.mosaic-body{padding-bottom:90px}.mosaic-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.mosaic-grid a{padding:14px;min-height:118px}.mosaic-grid span{font-size:12px}.button-row{display:grid;grid-template-columns:1fr}.primary-btn,.secondary-btn{width:100%}.shell{width:min(1180px,calc(100% - 32px))}}
@media (max-width:380px){.command-inner{grid-template-columns:58px 1fr 84px}.app-link{padding:0 10px}.brand-mark{font-size:18px}.mosaic-grid{grid-template-columns:1fr 1fr}.mosaic-grid a{padding:12px}}

.mb-16{margin-bottom:16px}.mt-14{margin-top:14px}.padded-card{padding:22px}