:root{color:#172033;--bg:#eef3f8;--surface:#fff;--surface-soft:#f8fbff;--line:#d6e0eb;--text:#172033;--muted:#62738a;--primary:#1f5fbf;--primary-soft:#eaf2ff;--green:#16a34a;--orange:#d97706;--red:#dc2626;--shadow:0 12px 30px #17203314;background:#eef3f8;font-family:Microsoft YaHei,PingFang SC,Arial,sans-serif}body{background:linear-gradient(180deg, #eaf2ff 0, #eaf2ff00 280px), var(--bg);margin:0}[hidden]{display:none!important}button,input,a{font:inherit}.shell{max-width:1240px;margin:0 auto;padding:18px 18px 32px}.topbar{justify-content:space-between;gap:16px;padding:14px 0 10px;display:flex}.topbar h1{letter-spacing:0;color:#0f1f35;margin:0;font-size:28px}.topbar p{color:#617089;margin:6px 0 0}.panel,.content{border:1px solid var(--line);box-shadow:var(--shadow);background:#ffffffc7;border-radius:12px;padding:16px}.panel{gap:12px;display:grid}.nav{z-index:20;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffffe0;border:1px solid #d6e0ebcc;border-radius:12px;flex-wrap:wrap;gap:8px;margin:14px 0 18px;padding:8px;display:flex;position:sticky;top:0}.nav a,button{color:#102a43;cursor:pointer;background:#fff;border:1px solid #bed0e3;border-radius:8px;padding:10px 12px;text-decoration:none;transition:border-color .16s,background .16s,color .16s,transform .16s}.nav a:hover,button:hover,.actions a:hover{border-color:var(--primary);transform:translateY(-1px)}button.active{border-color:var(--primary);background:var(--primary-soft)}button.danger{background:#fff1e8;border-color:#c2410c}input{border:1px solid #bcccdc;border-radius:6px;min-width:0;padding:10px 12px}@media (width<=700px){.panel{grid-template-columns:1fr}.topbar h1{font-size:22px}}.stack{gap:12px;display:grid}.actions{flex-wrap:wrap;gap:8px;display:flex}.actions a,.primary-action,.home-actions a,.review-filters a,.pager-actions a{color:#102a43;background:#fff;border:1px solid #bed0e3;border-radius:8px;padding:10px 12px;text-decoration:none}.primary-action{background:var(--primary);border-color:var(--primary);color:#fff;align-self:center;font-weight:700}.home-dashboard,.papers-view,.review-view,.review-practice-view,.exam,.practice-view{gap:16px;display:grid}.home-workbench{grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:14px;display:grid}.home-hero,.progress-panel,.home-suggestion,.review-summary,.review-round-panel,.section-header{border:1px solid var(--line);background:var(--surface);border-radius:12px;justify-content:space-between;align-items:center;gap:18px;padding:18px;display:flex}.home-hero{align-items:stretch}.home-hero h2{margin:4px 0 8px;font-size:30px}.home-hero p,.section-header p{color:var(--muted);margin:0;line-height:1.6}.eyebrow{font-size:13px;font-weight:700;color:var(--primary)!important;margin:0 0 4px!important}.stat-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;display:grid}.stat-card{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:14px}.stat-card strong{font-size:24px;line-height:1.2;display:block}.stat-card span{color:var(--muted);margin-top:6px;font-size:14px;display:block}.quick-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;display:grid}.quick-card{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:12px;padding:14px;text-decoration:none}.quick-card.priority{background:#fff8ec;border-color:#f0c27a}.quick-card strong,.quick-card span{display:block}.quick-card span{color:var(--muted);margin-top:6px;font-size:13px;line-height:1.5}.paper-progress-section{gap:10px;display:grid}.section-header.compact{padding:14px 16px}.section-header.compact h3{margin:0}.section-header.compact a{color:#102a43;border:1px solid #bed0e3;border-radius:8px;padding:9px 11px;text-decoration:none}.paper-progress-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;display:grid}.paper-progress-card{border:1px solid var(--line);background:var(--surface);border-radius:12px;gap:10px;padding:14px;display:grid}.paper-progress-head{justify-content:space-between;gap:12px;display:flex}.paper-progress-head h4{margin:5px 0 0;font-size:16px}.paper-progress-head strong{color:var(--primary);flex:none;font-size:22px}.paper-progress-stats{grid-template-columns:repeat(4,minmax(0,1fr));gap:6px;display:grid}.paper-progress-stats span{color:#42526b;text-align:center;background:#f0f5fb;border-radius:8px;padding:7px 8px;font-size:13px}.paper-progress-actions{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;display:grid}.paper-progress-actions a,.paper-progress-actions button{color:#102a43;text-align:center;background:#fff;border:1px solid #bed0e3;border-radius:8px;padding:9px 10px;text-decoration:none}.paper-progress-actions a:first-child{border-color:var(--primary);background:var(--primary-soft)}.paper-progress-actions button{color:#8a3b12;background:#fff8ed;border-color:#f2b37c}.paper-progress-actions button:disabled{cursor:wait;opacity:.72;transform:none}.home-suggestion{align-items:flex-start}.home-suggestion h3{margin:0 0 8px}.home-suggestion p{color:var(--muted);margin:0 0 12px;line-height:1.6}.hero-actions{flex-direction:column;justify-content:center;gap:8px;min-width:160px;display:flex}.hero-actions a{text-align:center;color:#102a43;border:1px solid #bed0e3;border-radius:8px;padding:10px 12px;text-decoration:none}.progress-panel{align-content:center;display:grid}.progress-head,.progress-foot{justify-content:space-between;gap:10px;display:flex}.progress-head span,.progress-foot{color:var(--muted)}.progress-head strong{font-size:28px}.progress-track{background:#e4ebf4;border-radius:999px;height:10px;overflow:hidden}.progress-track span{border-radius:inherit;background:linear-gradient(90deg,#1f5fbf,#16a34a);height:100%;display:block}.paper-row,.question{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:14px}.paper-row{justify-content:space-between;align-items:center;gap:12px;display:flex}.paper-grid{gap:10px;display:grid}.paper-card h3{margin:5px 0 6px}.paper-card p{color:var(--muted);margin:0}.paper-index{color:var(--primary);font-size:13px;font-weight:700}.paper-actions{flex-wrap:wrap;justify-content:flex-end;gap:8px;display:flex}.paper-actions a{color:#102a43;border:1px solid #bed0e3;border-radius:8px;padding:10px 12px;text-decoration:none}.exam-header{border:1px solid var(--line);background:#ffffffeb;border-radius:12px;justify-content:space-between;align-items:center;gap:12px;padding:14px;display:flex}.exam-sticky{z-index:10;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:sticky;top:76px}.exam-header h2{margin:0}.exam-header p{color:var(--muted);margin:6px 0 0}.question-list{gap:12px;display:grid}.question-meta{color:var(--muted);flex-wrap:wrap;gap:8px;margin-bottom:10px;font-size:14px;display:flex}.question-meta span{background:#f0f5fb;border-radius:999px;padding:4px 8px}.question-image{border:1px solid var(--line);background:#fff;border-radius:8px;max-width:100%}.options-details{margin:10px 0}.options-details summary{color:#102a43;cursor:pointer;background:#f8fbff;border:1px solid #bed0e3;border-radius:8px;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;font-weight:700;list-style:none;display:flex}.options-details summary::-webkit-details-marker{display:none}.options-details summary:before{content:"＋";color:var(--primary);flex:none;font-weight:800}.options-details[open] summary:before{content:"－"}.options-details summary>span{align-items:center;gap:8px;display:inline-flex}.options-details summary em{color:var(--muted);font-size:13px;font-style:normal;font-weight:500}.options-details .collapse-label,.options-details:not([open]) .practice-options,.options-details[open] .expand-label{display:none}.options-details[open] .collapse-label{display:inline}.options{gap:8px;margin:10px 0;display:grid}.option,.option-choice{align-items:flex-start;gap:8px;display:flex}.practice-options{grid-template-columns:1fr 1fr}.option-choice{text-align:left;background:#fff;width:100%;min-height:46px;line-height:1.55}.option-choice span{color:#32506d;background:#eef4fb;border-radius:50%;flex:none;justify-content:center;align-items:center;width:24px;height:24px;font-weight:700;display:inline-flex}.option-choice strong{font-weight:400}.option-choice.selected{background:#eef5ff;border-color:#1f5fbf}.option-choice.selected span{color:#fff;background:#1f5fbf}.option-choice.correct{background:#f0fdf4;border-color:#16a34a}.option-choice.correct span{color:#fff;background:#16a34a}.option-choice.incorrect{background:#fef2f2;border-color:#dc2626}.option-choice.incorrect span{color:#fff;background:#dc2626}.choice-feedback{border:1px solid #d9e2ec;border-radius:6px;margin:10px 0 0;padding:10px 12px;font-weight:700;line-height:1.55}.choice-feedback.correct{color:#14532d;background:#f0fdf4;border-color:#16a34a}.choice-feedback.incorrect{color:#7c2d12;background:#fff7ed;border-color:#d97706}.choice-feedback.save-error{color:#991b1b;background:#fef2f2;border-color:#dc2626}.question-table{border-collapse:collapse;width:100%;margin:10px 0}.question-table td{border:1px solid #d9e2ec;padding:8px}.explanation{margin-top:12px}.explanation h4{margin:0 0 6px;font-size:15px}.explanation p{margin:0;line-height:1.7}.practice-view{gap:12px;display:grid}.practice-layout{grid-template-columns:86px minmax(0,1fr);align-items:start;gap:12px;display:grid}.question-rail{grid-template-columns:repeat(2,1fr);gap:6px;display:grid;position:sticky;top:12px}.question-rail-item{border:1px solid var(--line);color:#42526b;background:#fff;border-radius:8px;justify-content:center;align-items:center;min-height:34px;font-size:14px;text-decoration:none;display:flex}.question-rail-item.active{color:#fff;background:#1f5fbf;border-color:#1f5fbf;font-weight:700}.question-rail-item.known{border-color:#79b88a}.question-rail-item.wrong{background:#fff7ed;border-color:#d97706}.practice-question{min-width:0}.favorite-slot{justify-content:flex-end;display:flex}.practice-control-bar{border:1px solid var(--line);z-index:12;box-shadow:var(--shadow);background:#fff;border-radius:12px;grid-template-columns:1fr 1fr 1fr;gap:8px;padding:10px;display:grid;position:sticky;bottom:12px}.practice-control-bar [data-known]{color:#fff;background:#1f5fbf;border-color:#1f5fbf;font-weight:700}.practice-control-bar [data-unknown]{color:#7c2d12;border-color:#d97706}.answer-panel,.answer-details{border:1px solid var(--line);background:#fbfdff;border-radius:10px;margin-top:12px;padding:12px;display:block}.answer-details summary{cursor:pointer;font-weight:700}.answer-layer{border-top:1px solid #e3eaf3;margin-top:10px;padding-top:10px}.answer-layer:first-child{border-top:0;margin-top:0;padding-top:0}.answer-layer h4{margin:0 0 8px;font-size:15px}.answer-layer p{margin:0;line-height:1.75}.pager-actions{justify-content:space-between}.stats{flex-wrap:wrap;gap:8px;display:flex}.stats span{color:#243b53;background:#f0f5fb;border-radius:999px;padding:7px 10px}.review-filters a.active{border-color:var(--primary);background:var(--primary-soft);color:#123f7a}.review-list{gap:12px;display:grid}.empty-state{color:var(--muted);text-align:center;background:#fbfdff;border:1px dashed #b8c7d8;border-radius:12px;padding:24px}.review-round-panel{display:block}@media (width<=860px){.home-workbench,.quick-grid,.paper-progress-grid,.stat-grid,.practice-layout{grid-template-columns:1fr}.question-rail{grid-template-columns:repeat(6,minmax(0,1fr));position:static}.exam-sticky{top:8px}.practice-control-bar{grid-template-columns:1fr 1fr}.practice-control-bar [data-answer-toggle]{grid-column:1/-1}}@media (width<=640px){.shell,.content{padding:10px}.topbar h1{font-size:22px}.home-hero,.home-suggestion,.section-header,.exam-header,.paper-row{flex-direction:column;align-items:stretch}.practice-options{grid-template-columns:1fr}.paper-actions,.hero-actions{width:100%}.paper-actions a,.hero-actions a{flex:1}.paper-progress-stats{grid-template-columns:repeat(2,minmax(0,1fr))}}.review-view{gap:14px}.review-summary,.review-filters{background:#fff;border:1px solid #d9e2ec;border-radius:8px;padding:12px}.review-summary h3{margin:0 0 10px}.review-filters{flex-wrap:wrap;gap:8px;display:flex}.review-filters a.active{color:#fff;background:#1f5fbf;border-color:#1f5fbf}.review-complete{grid-template-columns:1fr}@media (width<=720px){.shell{padding:10px 10px 92px}.topbar{padding:10px 0}.topbar h1{font-size:20px}.topbar p{font-size:13px}.nav{gap:6px;margin:10px 0}.nav a,button,.actions a,.primary-action,.home-actions a,.review-filters a,.pager-actions a{padding:9px 10px}.content{padding:10px}.home-hero{display:grid}.primary-action{text-align:center;width:auto}.stat-grid,.home-actions{grid-template-columns:repeat(2,minmax(0,1fr))}.practice-layout{grid-template-columns:1fr}.question-rail{grid-template-columns:repeat(8,minmax(34px,1fr));padding-bottom:2px;position:static;overflow-x:auto}.question-rail-item{min-width:34px}.exam-header{align-items:flex-start}.favorite-slot{flex:none}.practice-control-bar{z-index:10;position:fixed;bottom:10px;left:10px;right:10px;box-shadow:0 12px 28px #21385b33}.question-table{white-space:nowrap;display:block;overflow-x:auto}.practice-options{grid-template-columns:1fr}}
