@font-face{font-family:PuHuiTi;src:url('./fonts/PuHuiTi-Regular.otf') format('opentype');font-weight:400;font-display:swap}
@font-face{font-family:PuHuiTi;src:url('./fonts/PuHuiTi-Medium.otf') format('opentype');font-weight:500 600;font-display:swap}
@font-face{font-family:PuHuiTi;src:url('./fonts/PuHuiTi-Bold.otf') format('opentype');font-weight:700 900;font-display:swap}
/* MasterGo tokens: paint_3:305/313/337/456/668, effect_3:375/675/670.
   Fixed 1200px content; 1920px reference canvas. No responsive scaling. */
:root{
  --page-width:1200px;--canvas-width:1920px;--header-height:67px;--banner-height:440px;--main-height:1893px;--footer-height:70px;
  --page-bg:#edf5ff;--paper:#fff;--ink:#010f5c;--muted:#7186a6;--brand:#073d87;--nav:#31557e;--link:#0c4a9e;--primary:#2a7dff;--active:#1d5dc1;--stroke:#dde9fb;--subtle:#f6faff;--placeholder:#a4b1c5;
  --category-paper:#1060ee;--category-course:#28acae;--category-industry:#f87f19;--category-frontier:#8553ee;--category-ai:#f93b58;--category-case:#3890f9;
  --heading-line:#c8dcfc;--heading-accent:linear-gradient(90deg,#1d5dc1 0%,#4e8cfa 53%,#18a8f9 99%);--banner-tint:linear-gradient(90deg,rgba(26,77,137,.7) 47%,rgba(26,77,137,.3) 76%,rgba(26,77,137,0) 94%);--banner-text:#9ad3f6;--banner-emphasis:linear-gradient(180deg,#d2f1fe,#78d9fe);
  --card-shadow:0 4px 20px rgba(5,54,141,.1);--search-shadow:0 4px 15px rgba(16,96,238,.1);--button-shadow:0 4px 13px rgba(23,102,226,.4);--header-shadow:0 9px 19px 5px rgba(13,70,137,.4);--text-shadow:0 4px 10px #013876;
  --s1:4px;--s2:8px;--s3:10px;--s4:11px;--s5:15px;--s6:20px;--s7:25px;--s8:30px;--s9:33px;--s10:40px;--s11:50px;--s12:60px;--s13:75px;--s14:100px;
  --research-height:72px;--research-button-size:44px;--research-icon-size:20px;--research-icon-offset:2px;--research-surface:var(--paper);--research-shortcuts-top:280px;
  --radius-sm:8px;--radius-card:10px;--radius-button:15px;--radius-search:20px;--radius-pill:30px;
  --font-body:PuHuiTi,'PingFang SC','Microsoft YaHei',sans-serif;--font-brand:'Alimama ShuHeiTi',PuHuiTi,sans-serif;
}

.site-header{position:relative;z-index:3;width:100%;height:var(--header-height);background:var(--paper);box-shadow:none}
.header-inner{height:100%;margin:0 var(--s14);display:grid;grid-template-columns:245px minmax(0,1.317fr) 796px minmax(0,1fr) 160px;align-items:center;min-width:1201px}
.brand{display:flex;align-items:flex-start;gap:5px;width:245px;height:35px}.brand-icon{width:40px;height:auto;flex:none;align-self:flex-start}.brand-copy{width:200px}.brand strong{display:block;font:700 18px/18px var(--font-brand);letter-spacing:.18px;white-space:nowrap;color:var(--brand)}.brand small{display:block;white-space:nowrap;font-size:8.5px;line-height:18px;letter-spacing:-.255px;color:var(--muted)}
.header-center{grid-column:3;display:flex;align-items:center;gap:var(--s13);height:100%}.main-nav{display:flex;gap:34px;height:100%;align-items:center;white-space:nowrap}.main-nav a,.main-nav button{position:relative;color:var(--nav);font-size:15px;line-height:15px;font-weight:500}.main-nav .active{color:var(--active)}.main-nav .active::after{content:'';position:absolute;left:1px;bottom:-26px;width:30px;height:3px;border-radius:5px 5px 0 0;background:var(--active)}
.header-search{display:flex;align-items:center;gap:16px;flex:none;width:220px;height:34px;padding:0 12px;border:1px solid var(--stroke);border-radius:var(--radius-sm);background:var(--subtle)}.header-search .icon{width:11px;height:12px}.header-search input{width:165px;min-width:0;padding:0;border:0;outline:none;background:none;font-size:12px;color:var(--nav)}.header-search input::placeholder{color:var(--placeholder)}
.account{grid-column:5;display:flex;gap:var(--s6);align-items:center}.notification{position:relative;width:25px;height:25px}.notification .bell{position:absolute;width:18px;height:22px;left:4px;top:2px}.notification .badge{position:absolute;left:15px;top:2px;width:6px;height:6px}.profile{display:flex;gap:var(--s3);align-items:center;white-space:nowrap;font-size:15px;color:var(--nav)}.avatar{position:relative;width:36px;height:36px;flex:none}.avatar>span{position:absolute;inset:0}.avatar .avatar-inner{inset:3px}.avatar img{position:absolute;inset:3px;width:30px;height:30px;border-radius:50%;object-fit:cover}.profile-arrow{width:9px;height:13px}
.account{position:relative}.message-panel{position:absolute;z-index:20;right:0;top:calc(100% + var(--s5));width:calc(var(--s14) * 3);padding:var(--s10) var(--s6);border:1px solid var(--stroke);border-radius:var(--radius-card);background:var(--paper);box-shadow:var(--card-shadow);color:var(--muted);text-align:center}.message-panel[hidden]{display:none}