:root{--bg:#f2f5f9;--bg-strong:#dce8f4;--card:rgba(255,255,255,0.88);--card-solid:#fff;--ink:#1f2d3d;--ink-soft:#4f6275;--ink-faint:#8a9db0;--line:#d5e0eb;--line-light:#e8eff6;--primary:#0f5b8d;--primary-strong:#0c4469;--primary-faint:rgba(15,91,141,0.08);--accent:#b76a18;--accent-faint:rgba(183,106,24,0.08);--ok:#0f766e;--hint:#eaf4ff;--hint-border:#c8def3;--shadow-sm:0 4px 12px rgba(11,37,62,0.06);--shadow:0 16px 36px rgba(11,37,62,0.1);--shadow-lg:0 24px 48px rgba(11,37,62,0.14);--r-lg:20px;--r-md:14px;--r-sm:10px;--r-xs:8px}*{box-sizing:border-box;margin:0}body{font-family:PingFang SC,Microsoft YaHei,Noto Sans SC,sans-serif;color:var(--ink);background:radial-gradient(circle at 12% -5%,rgba(15,91,141,.13),transparent 38%),radial-gradient(circle at 88% -5%,rgba(183,106,24,.12),transparent 34%),linear-gradient(160deg,var(--bg) 0,#edf4fa 55%,var(--bg-strong) 100%);min-height:100vh}.serif,h1,h2,h3{font-family:Songti SC,"Noto Serif SC","Source Han Serif 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ease;display:inline-flex;align-items:center;justify-content:center;gap:6px}.btn:hover{transform:translateY(-1px)}.btn-primary{color:#fff;background:linear-gradient(130deg,var(--primary),var(--primary-strong));box-shadow:0 10px 20px rgba(15,91,141,.22)}.btn-accent{color:#fff;background:linear-gradient(130deg,#be6f1c,#a45411);box-shadow:0 10px 20px rgba(165,84,17,.2)}.btn-outline{background:#fff}.btn-ghost,.btn-outline{color:var(--ink-soft);border:1px solid var(--line)}.btn-ghost{background:transparent;min-height:32px;font-size:12px;border-radius:var(--r-xs)}.btn[disabled]{cursor:not-allowed;opacity:.5;box-shadow:none;transform:none}.input{min-height:38px;border:1px solid var(--line);border-radius:var(--r-xs);background:#fff;padding:0 12px;color:var(--ink);font-size:14px;width:100%;transition:.18s}.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-faint)}textarea.input{padding:10px 12px;min-height:120px;resize:vertical;line-height:1.6}.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:500;border:1px solid var(--line);background:#f4f9ff;color:var(--ink-soft)}.tag-accent{background:var(--accent-faint);color:var(--accent);border-color:rgba(183,106,24,.2)}.active-chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:12px;border:1px solid #c7d9ea;background:#f3f9ff;color:#2f5672}.active-chip button{border:0;background:transparent;color:#4b6b84;cursor:pointer;padding:0;font-size:12px;line-height:1}.active-chip button:hover{color:#1a3f5d}.ck-label{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--ink-soft);cursor:pointer;padding:2px 0}.ck-label input[type=checkbox]{accent-color:var(--primary)}.ck-label .ck-count{margin-left:auto;font-size:11px;color:var(--ink-faint)}.ck-label.disabled{opacity:.4;cursor:default}.sug-item{padding:10px 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var(--line-light);background:var(--card);padding:10px 16px;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.study-shell{max-width:1360px;margin:0 auto;width:100%;display:flex;gap:14px;padding:14px 16px 18px;flex:1 1}.split-pane{width:50%;min-width:0}.step-badge{display:inline-flex;width:24px;height:24px;border-radius:7px;align-items:center;justify-content:center;background:var(--primary-faint);color:var(--primary);font-size:12px;font-weight:700}.lg-show{display:none!important}.topbar{background:linear-gradient(130deg,var(--primary),var(--primary-strong));color:#fff;box-shadow:0 12px 24px rgba(8,44,69,.22)}.topbar-inner{max-width:1160px;margin:0 auto;padding:10px 16px;justify-content:space-between;gap:10px}.topbar-inner,.topbar-left{display:flex;align-items:center}.topbar-left{gap:12px;flex-wrap:wrap}.topbar-brand{font-weight:700;letter-spacing:.2px}.topbar-links{display:flex;align-items:center;gap:6px}.nav-tab{border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.08);color:rgba(255,255,255,.82);padding:0 12px;height:32px;border-radius:999px;font-size:12px;font-weight:600;cursor:pointer;transition:.16s;display:inline-flex;align-items:center}.nav-tab:hover{background:rgba(255,255,255,.16)}.nav-tab.active{background:#fff;color:var(--primary);border-color:transparent;box-shadow:0 8px 18px rgba(7,42,67,.2)}.source-pill{font-size:12px;padding:2px 8px;border-radius:999px;border:1px solid rgba(255,255,255,.35);background:rgba(255,255,255,.12);color:rgba(255,255,255,.9)}.topbar-right{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.user-pill{opacity:.9;font-size:13px}.topbar .btn-outline{background:#fff;border-color:rgba(255,255,255,.4);color:var(--primary-strong)}.pdf-shell{background:#f4f8fd}.pdf-toolbar{justify-content:space-between;gap:8px;padding:8px 10px;border-bottom:1px solid var(--line-light);background:#f8fbff}.pdf-toolbar,.pdf-toolbar-group{display:flex;align-items:center;flex-wrap:wrap}.pdf-toolbar-group{gap:6px}.pdf-toolbar .btn{min-height:30px;padding:0 10px;font-size:12px}.pdf-canvas-wrap{min-height:700px;padding:12px;overflow:auto;display:flex;justify-content:center;align-items:flex-start;background:#edf3f9}.cases-mobile-close,.cases-mobile-toggle{display:none}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#c5d3e0;border-radius:3px}@media (max-width:1024px){.home-grid{grid-template-columns:1fr}.metric-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lg-hide{display:none!important}.lg-col{flex-direction:column!important}.lg-show{display:block!important}.split-pane{width:100%!important}}@media (max-width:960px){.cases-grid{grid-template-columns:1fr!important}.cases-sidebar{display:none;position:static!important}.cases-mobile-toggle,.cases-sidebar.open{display:block}.cases-mobile-close{display:inline-flex}}@media (max-width:900px){.study-layout{grid-template-columns:1fr!important}.topbar-inner{flex-wrap:wrap}}