/* ============ 学士库 · 全站共享导航与头部样式 ============ */
:root{
  --ink:#1f2937; --muted:#6b7280; --line:#e5e9f0; --bg:#f3f5f9; --chsi:#1e4fa3;
  --c-diag:#2563eb; --c-plan:#7c3aed; --c-lect:#d97706; --c-zt:#059669; --c-fm:#ea580c; --c-kb:#4f46e5;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* ---- 顶栏 ---- */
.sitehead{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.sitehead .topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 20px}
.brand{font-size:19px;font-weight:800;display:flex;align-items:baseline;gap:8px}
.brand a{color:var(--ink);text-decoration:none}
.brand .en{color:var(--chsi)}
.brand .slogan{font-size:12px;color:var(--muted);font-weight:500}
.topbar-right{display:flex;align-items:center;gap:10px}
.quota-chip{font-size:12.5px;color:var(--chsi);background:#eef3fb;border-radius:20px;padding:4px 12px;font-weight:600}
.kami-btn{border:1.5px solid var(--line);background:#fff;border-radius:20px;padding:4px 16px;font-size:12.5px;color:var(--chsi);font-weight:700;cursor:pointer;transition:all .2s}
.kami-btn:hover{border-color:var(--chsi);background:#eef3fb;transform:translateY(-1px)}

/* ---- 主导航（六宫按钮 + 动画） ---- */
.mainnav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:57px;z-index:49;box-shadow:0 1px 0 rgba(0,0,0,.02)}
.mainnav .navwrap{display:flex;gap:10px;padding:10px 20px;overflow-x:auto;scrollbar-width:none}
.mainnav .navwrap::-webkit-scrollbar{display:none}
.nav-btn{flex-shrink:0;display:flex;align-items:center;gap:7px;text-decoration:none;font-size:14px;font-weight:700;color:var(--ink);border:1.5px solid var(--line);background:#fff;border-radius:14px;padding:9px 18px;transition:transform .22s cubic-bezier(.34,1.56,.64,1),box-shadow .22s,border-color .22s,background .22s,color .22s;position:relative;overflow:hidden}
.nav-btn .ni{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:8px;font-size:14px;color:#fff;background:var(--nc,var(--chsi));transition:transform .25s}
.nav-btn:hover{transform:translateY(-3px);box-shadow:0 8px 18px -6px var(--nsh,rgba(30,79,163,.35));border-color:var(--nc,var(--chsi));color:var(--nc,var(--chsi))}
.nav-btn:hover .ni{transform:scale(1.12) rotate(-6deg)}
.nav-btn:active{transform:translateY(-1px) scale(.97)}
.nav-btn.active{background:linear-gradient(135deg,var(--nc,var(--chsi)),color-mix(in srgb,var(--nc,var(--chsi)) 72%,#000));border-color:transparent;color:#fff;box-shadow:0 6px 16px -4px var(--nsh,rgba(30,79,163,.4))}
.nav-btn.active .ni{background:rgba(255,255,255,.22)}
.nav-diag{--nc:#2563eb;--nsh:rgba(37,99,235,.35)}
.nav-plan{--nc:#7c3aed;--nsh:rgba(124,58,237,.35)}
.nav-lect{--nc:#d97706;--nsh:rgba(217,119,6,.35)}
.nav-zt{--nc:#059669;--nsh:rgba(5,150,105,.35)}
.nav-fm{--nc:#ea580c;--nsh:rgba(234,88,12,.35)}
.nav-kb{--nc:#4f46e5;--nsh:rgba(79,70,229,.35)}

/* ---- 子页面页头 banner ---- */
.page-hero{color:#fff;padding:34px 20px 30px;border-radius:0 0 22px 22px;position:relative;overflow:hidden;margin-bottom:22px}
.page-hero .wrap{position:relative;z-index:1}
.page-hero h1{font-size:26px;font-weight:800;letter-spacing:.5px;display:flex;align-items:center;gap:10px}
.page-hero p{font-size:13.5px;opacity:.92;margin-top:6px;max-width:760px}
.page-hero .ph-ico{font-size:30px}
.page-hero::before{content:"";position:absolute;right:-60px;top:-60px;width:240px;height:240px;border-radius:50%;background:rgba(255,255,255,.12)}
.page-hero::after{content:"";position:absolute;right:60px;bottom:-80px;width:200px;height:200px;border-radius:50%;background:rgba(255,255,255,.08)}
.ph-lect{background:linear-gradient(135deg,#b45309,#d97706 55%,#f59e0b)}
.ph-zt{background:linear-gradient(135deg,#047857,#059669 55%,#10b981)}
.ph-kb{background:linear-gradient(135deg,#3730a3,#4f46e5 55%,#6366f1)}
.ph-zt.t1{background:linear-gradient(135deg,#1e40af,#2563eb 55%,#3b82f6)}
.ph-zt.t2{background:linear-gradient(135deg,#047857,#059669 55%,#10b981)}
.ph-zt.t3{background:linear-gradient(135deg,#c2410c,#ea580c 55%,#f97316)}

/* ---- 入场动画 ---- */
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.fade-in{animation:fadeUp .45s ease both}
.fade-in.d1{animation-delay:.06s}.fade-in.d2{animation-delay:.12s}.fade-in.d3{animation-delay:.18s}.fade-in.d4{animation-delay:.24s}

/* ---- 卡密弹窗 ---- */
.code-mask{display:none;position:fixed;inset:0;background:rgba(15,23,42,.55);z-index:200;align-items:center;justify-content:center;backdrop-filter:blur(2px)}
.code-mask.show{display:flex}
.code-card{background:#fff;border-radius:16px;padding:26px;width:min(92vw,380px);animation:fadeUp .28s ease both;box-shadow:0 24px 60px rgba(15,23,42,.3)}
.code-card h3{font-size:17px;margin-bottom:4px}
.code-card .sub{font-size:12.5px;color:var(--muted);margin-bottom:14px}
.code-card input{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;font-size:15px;letter-spacing:2px;margin-bottom:12px}
.code-card input:focus{outline:none;border-color:var(--chsi)}
.code-card .row{display:flex;gap:10px}
.code-card .row button{flex:1;border:none;border-radius:10px;padding:11px 0;font-size:14px;font-weight:700;cursor:pointer;transition:all .2s}
.code-ok{background:var(--chsi);color:#fff}
.code-ok:hover{filter:brightness(1.1)}
.code-cancel{background:#f1f4f9;color:var(--muted)}
.code-msg{font-size:12.5px;color:#dc2626;min-height:18px;margin-bottom:6px}

/* ---- 通用卡片 ---- */
.gcard{background:#fff;border-radius:16px;padding:24px;margin-bottom:18px;box-shadow:0 1px 4px rgba(15,23,42,.05)}
.foot-note{text-align:center;color:var(--muted);font-size:12px;padding:22px 0 34px}
@media(max-width:640px){
  .mainnav .navwrap{gap:7px;padding:9px 12px}
  .nav-btn{padding:8px 12px;font-size:13px;border-radius:12px}
  .nav-btn .ni{width:22px;height:22px;font-size:12px}
  .page-hero h1{font-size:21px}
  .brand .slogan{display:none}
  .topbar{padding:10px 14px}
}