:root{color-scheme:light;--bg: #f4f7fb;--surface: #ffffff;--surface-2: #eef3f8;--ink: #132033;--muted: #6f7c8e;--line: #dce4ee;--accent: #1769e0;--accent-2: #0f4ba8;--good: #12845f;--good-bg: #e7f6ef;--bad: #c93d3d;--bad-bg: #fff0ef;--fav: #c48711;--shadow: 0 18px 45px rgba(27, 42, 65, .08)}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--ink)}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px;background:linear-gradient(135deg,rgba(23,105,224,.08),transparent 40%),linear-gradient(315deg,rgba(18,132,95,.1),transparent 36%),var(--bg)}.login-panel{width:min(440px,100%);background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:34px}.login-icon,.brand-mark{width:48px;height:48px;display:grid;place-items:center;border-radius:8px;background:#e8f0ff;color:var(--accent)}.login-panel h1{margin:20px 0 8px;font-size:28px;line-height:1.15}.login-panel p{margin:0 0 26px;color:var(--muted);line-height:1.7}.login-form,.page-stack,.bank-list,.option-list,.exam-list{display:grid;gap:14px}.login-form label,.note-box{display:grid;gap:8px;color:var(--muted);font-size:13px;font-weight:700}.login-form input,.search-field input,select,textarea{width:100%;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);outline:none}.login-form input,select{height:44px;padding:0 12px}textarea{min-height:82px;padding:12px;resize:vertical}.login-form input:focus,.search-field input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px #1769e01f}.form-error{padding:10px 12px;border-radius:8px;background:var(--bad-bg);color:var(--bad);font-size:14px}.app-shell{min-height:100vh;display:grid;grid-template-columns:248px minmax(0,1fr)}.sidebar{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:22px;padding:22px 16px;background:#111a2b;color:#eaf1fb}.brand{display:flex;align-items:center;gap:12px;padding:4px 6px 14px;border-bottom:1px solid rgba(255,255,255,.12)}.brand strong{display:block;font-size:20px}.brand span{display:block;color:#9fb1c9;font-size:13px;margin-top:2px}.side-nav{display:grid;gap:8px}.nav-button,.logout-button{width:100%;height:44px;display:flex;align-items:center;gap:10px;border:0;border-radius:8px;padding:0 12px;background:transparent;color:#b7c5d9;text-align:left}.nav-button.active,.nav-button:hover,.logout-button:hover{background:#ffffff1a;color:#fff}.logout-button{margin-top:auto}.workspace{min-width:0;padding:28px}.page-header{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:24px;box-shadow:var(--shadow)}.page-header.compact{box-shadow:none}.page-header h1{margin:0;font-size:30px;line-height:1.2}.page-header p,.empty-copy{margin:8px 0 0;color:var(--muted);line-height:1.7}.primary-button,.secondary-button{min-height:42px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:8px;border:1px solid transparent;padding:0 16px;font-weight:800;white-space:nowrap}.primary-button{background:var(--accent);color:#fff}.primary-button:hover{background:var(--accent-2)}.secondary-button{background:var(--surface);border-color:var(--line);color:var(--ink)}.secondary-button:hover,.secondary-button.active{border-color:var(--accent);color:var(--accent)}.metric-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:14px}.learn-hero{align-items:stretch}.motivation-line{width:fit-content;display:inline-flex;align-items:center;gap:8px;margin-top:14px;padding:9px 12px;border-radius:8px;background:var(--good-bg);color:var(--good);font-size:14px;font-weight:800}.learn-score-card{min-width:178px;display:grid;align-content:center;justify-items:start;gap:4px;padding:18px;border:1px solid var(--line);border-radius:8px;background:#fbfdff}.learn-score-card span,.learn-score-card small{color:var(--muted);font-size:13px;font-weight:800}.learn-score-card strong{font-size:38px;line-height:1}.learn-tabs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.learn-tabs button{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);padding:0 18px;text-align:left}.learn-tabs button.active{border-color:var(--accent);background:#e8f0ff;color:var(--accent)}.learn-tabs strong{font-size:20px}.learn-tabs span{color:var(--muted);font-size:13px;font-weight:800}.learn-overview-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.metric-mini{min-height:92px;display:grid;align-content:space-between;padding:16px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.metric-mini svg{color:var(--accent)}.metric-mini span{color:var(--muted);font-size:13px;font-weight:800}.metric-mini strong{font-size:26px;line-height:1}.learn-layout{display:grid;grid-template-columns:360px minmax(0,1fr);gap:14px;align-items:start}.roadmap-panel{position:sticky;top:18px}.roadmap-stages{display:grid;gap:16px}.roadmap-stage h3{margin:0 0 10px;color:var(--muted);font-size:13px}.module-strip{display:grid;gap:8px}.module-strip button{min-height:58px;display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--line);border-radius:8px;background:#fbfdff;color:var(--ink);padding:0 12px;text-align:left}.module-strip button.active{border-color:var(--accent);background:#e8f0ff;color:var(--accent)}.module-strip span{color:var(--muted);font-size:12px;font-weight:800}.learning-detail{display:grid;gap:16px}.learning-detail-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.learning-detail-head span{color:var(--accent);font-size:13px;font-weight:900}.learning-detail-head h2{margin:4px 0 0;font-size:28px}.learning-summary,.learning-cards-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.learning-summary section,.learn-card,.protocol-diagram,.glossary-panel{border:1px solid var(--line);border-radius:8px;background:#fbfdff;padding:16px}.learning-summary h3,.learn-card h3,.glossary-panel h3,.diagram-title h3{margin:0 0 8px;font-size:16px}.learning-summary p,.learn-card p{margin:0;color:#344154;line-height:1.75}.learn-card ul{margin:0;padding-left:18px;color:#344154;line-height:1.8}.mnemonic-card{grid-column:1 / -1;background:var(--good-bg);color:var(--good)}.mnemonic-card p{color:var(--good);font-weight:900}.diagram-title{display:flex;align-items:center;gap:8px}.diagram-title svg{color:var(--accent)}.diagram-flow{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:14px}.diagram-node-wrap{display:inline-flex;align-items:center;gap:8px}.diagram-node-wrap svg{color:var(--muted)}.diagram-node{min-height:44px;display:grid;place-items:center;padding:0 14px;border:1px solid rgba(23,105,224,.24);border-radius:8px;background:#e8f0ff;color:var(--accent);font-weight:900}.diagram-edges,.glossary-grid,.knowledge-map-grid{display:grid;gap:10px}.diagram-edges{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));margin-top:14px}.diagram-edges span{padding:8px 10px;border-radius:8px;background:var(--surface-2);color:var(--muted);font-size:12px;font-weight:800}.glossary-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.glossary-grid div{display:grid;gap:6px;padding:12px;border-radius:8px;background:var(--surface);border:1px solid var(--line)}.glossary-grid strong{color:var(--accent)}.glossary-grid span{color:var(--muted);line-height:1.6;font-size:13px}.knowledge-map-grid{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}.knowledge-map-grid button{min-height:88px;display:grid;justify-items:start;gap:7px;border:1px solid var(--line);border-radius:8px;background:#fbfdff;color:var(--ink);padding:14px;text-align:left}.knowledge-map-grid button.active{border-color:var(--accent);background:#e8f0ff;color:var(--accent)}.knowledge-map-grid svg{color:var(--accent)}.knowledge-map-grid span{color:var(--muted);font-size:12px;font-weight:800}.metric-card,.panel,.question-card,.exam-question,.empty-panel{background:var(--surface);border:1px solid var(--line);border-radius:8px}.metric-card{min-height:116px;display:grid;align-content:space-between;padding:18px}.metric-card svg{color:var(--accent)}.metric-card span{color:var(--muted);font-size:13px;font-weight:700}.metric-card strong{font-size:28px;line-height:1}.dashboard-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(260px,.7fr);gap:14px}.panel{padding:20px}.panel-title{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.panel-title h2{margin:0;font-size:18px}.panel-title span{color:var(--muted);font-size:13px}.bank-row{display:grid;gap:10px}.bank-row>div:first-child{display:flex;justify-content:space-between;gap:16px}.bank-row span{color:var(--muted);font-size:13px}.progress-track{height:8px;overflow:hidden;border-radius:999px;background:var(--surface-2)}.progress-track span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--good))}.action-panel{align-content:start;display:grid;gap:10px}.action-panel button,.wrong-strip button{min-height:44px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);text-align:left;padding:0 12px;font-weight:800}.action-panel button:hover,.wrong-strip button:hover{border-color:var(--accent);color:var(--accent)}.wrong-strip{display:flex;flex-wrap:wrap;gap:10px}.wrong-strip button{display:inline-flex;align-items:center;gap:10px}.wrong-strip span{color:var(--muted);font-size:12px}.toolbar{display:grid;grid-template-columns:minmax(220px,1fr) 150px 150px auto;gap:10px;align-items:center}.search-field{height:44px;display:flex;align-items:center;gap:10px;padding:0 12px;background:var(--surface);border:1px solid var(--line);border-radius:8px}.search-field input{height:40px;padding:0;border:0}.segmented{height:44px;display:inline-grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--surface)}.segmented button{border:0;border-left:1px solid var(--line);background:transparent;color:var(--muted);padding:0 12px;font-weight:800}.segmented button:first-child{border-left:0}.segmented button.active{background:#e8f0ff;color:var(--accent)}.practice-layout{display:grid;grid-template-columns:164px minmax(0,1fr);gap:14px;align-items:start}.question-rail{position:sticky;top:20px;max-height:calc(100vh - 40px);overflow:auto;padding:14px;background:var(--surface);border:1px solid var(--line);border-radius:8px}.rail-head{display:flex;align-items:baseline;gap:4px;margin-bottom:12px}.rail-head strong{font-size:24px}.rail-head span{color:var(--muted)}.rail-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.rail-grid button{aspect-ratio:1;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--muted);font-size:12px;font-weight:800}.rail-grid button.active{border-color:var(--accent);background:#e8f0ff;color:var(--accent)}.rail-grid button.done{border-color:#12845f47;background:var(--good-bg);color:var(--good)}.rail-grid button.wrong{border-color:#c93d3d47;background:var(--bad-bg);color:var(--bad)}.rail-grid button.fav{box-shadow:inset 0 -3px #c48711b3}.question-card{padding:24px;box-shadow:var(--shadow)}.question-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}.question-meta span,.header-counter{display:inline-flex;align-items:center;gap:6px;min-height:28px;padding:0 10px;border-radius:8px;background:var(--surface-2);color:var(--muted);font-size:12px;font-weight:800}.question-card h2,.exam-question h2{margin:0;font-size:22px;line-height:1.55;white-space:pre-wrap}.image-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;margin:18px 0}.image-grid img{width:100%;max-height:520px;object-fit:contain;border:1px solid var(--line);border-radius:8px;background:#fbfdff}.option-list{margin-top:20px}.option-button{width:100%;display:grid;grid-template-columns:36px minmax(0,1fr);gap:12px;align-items:start;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);padding:14px;text-align:left;line-height:1.6}.option-button:hover,.option-button.picked{border-color:var(--accent);background:#f5f8ff}.option-button.correct{border-color:#12845f66;background:var(--good-bg)}.option-button.wrong{border-color:#c93d3d66;background:var(--bad-bg)}.option-key{width:30px;height:30px;display:grid;place-items:center;border-radius:8px;background:var(--surface-2);font-weight:900}.question-actions,.pager,.exam-summary{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px}.result-box,.mini-result{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px;padding:14px;border-radius:8px;font-weight:800}.result-box span{display:block;margin-top:4px;font-weight:700}.success{background:var(--good-bg);color:var(--good)}.danger{background:var(--bad-bg);color:var(--bad)}.analysis-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}.analysis-grid section{padding:16px;border-radius:8px;background:#f8fafc;border:1px solid var(--line)}.analysis-grid h3{margin:0 0 8px;font-size:15px}.analysis-grid p{margin:0;color:#344154;line-height:1.8;white-space:pre-wrap}.note-box{margin-top:18px}.analysis-panel{margin-top:18px;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#f8fafc}.analysis-tabs{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-bottom:1px solid var(--line);background:var(--surface)}.analysis-tabs button{min-height:42px;border:0;border-left:1px solid var(--line);background:transparent;color:var(--muted);font-size:13px;font-weight:900}.analysis-tabs button:first-child{border-left:0}.analysis-tabs button.active{background:#e8f0ff;color:var(--accent)}.analysis-body{padding:16px}.analysis-body h3{margin:0 0 8px;font-size:16px}.analysis-body p{margin:0;color:#344154;line-height:1.85;white-space:pre-wrap}.shortcut-bar{display:flex;flex-wrap:wrap;gap:8px}.shortcut-bar span{min-height:28px;display:inline-flex;align-items:center;padding:0 10px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--muted);font-size:12px;font-weight:800}.syllabus-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;align-items:start}.syllabus-card{display:grid;gap:16px}.syllabus-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}.syllabus-head span{display:block;color:var(--accent);font-size:13px;font-weight:900}.syllabus-head h2{margin:6px 0 0;font-size:20px;line-height:1.3}.syllabus-head svg{color:var(--accent)}.exam-facts,.focus-list{display:flex;flex-wrap:wrap;gap:8px}.exam-facts span,.focus-list span{min-height:28px;display:inline-flex;align-items:center;gap:5px;border-radius:8px;background:var(--surface-2);color:var(--muted);padding:0 10px;font-size:12px;font-weight:800}.topic-list{display:grid;gap:10px}.topic-row{padding:14px;border:1px solid var(--line);border-radius:8px;background:#fbfdff}.topic-title{display:flex;align-items:center;justify-content:space-between;gap:12px}.topic-title strong{font-size:17px}.topic-title span,.topic-row p{color:var(--muted)}.topic-row p{margin:8px 0 10px;line-height:1.65}.pager{margin-bottom:4px}.pager span{color:var(--muted);font-weight:800}.empty-panel,.exam-start{min-height:260px;display:grid;place-items:center;align-content:center;gap:12px;padding:30px;color:var(--muted);text-align:center}.exam-start svg{color:var(--accent)}.exam-start h2{margin:0;color:var(--ink);font-size:24px}.exam-start p{margin:0}.exam-panel{display:grid;gap:14px}.exam-summary{position:sticky;top:0;z-index:2;margin-top:0;padding:14px;border:1px solid var(--line);border-radius:8px;background:#fffffff0;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.exam-summary>div{display:flex;align-items:center;gap:8px;color:var(--muted);font-weight:800}.exam-summary strong{font-size:24px}.exam-question{padding:18px}.compact-images{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.compact-options{gap:8px}.compact-options .option-button{padding:10px}.mini-result{justify-content:flex-start}.official-exam .result-box{margin-top:0}.exam-workspace{display:grid;grid-template-columns:156px minmax(0,1fr);gap:14px;align-items:start}.exam-palette{position:sticky;top:74px;max-height:calc(100vh - 92px);overflow:auto;display:grid;grid-template-columns:repeat(4,1fr);gap:6px;padding:12px;border:1px solid var(--line);border-radius:8px;background:var(--surface)}.exam-palette button{aspect-ratio:1;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--muted);font-size:12px;font-weight:900}.exam-palette button.active{border-color:var(--accent);background:#e8f0ff;color:var(--accent)}.exam-palette button.answered{border-color:#12845f47;background:var(--good-bg);color:var(--good)}.exam-palette button.marked{box-shadow:inset 0 -3px #c48711e6}.active-exam-question{box-shadow:var(--shadow)}@media(max-width:1100px){.metric-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.learn-layout{grid-template-columns:1fr}.roadmap-panel{position:static}.toolbar{grid-template-columns:1fr 1fr}.segmented{grid-column:1 / -1}}@media(max-width:860px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;padding:12px}.brand{padding-bottom:10px}.side-nav{grid-template-columns:repeat(6,1fr)}.nav-button,.logout-button{justify-content:center}.logout-button{margin-top:0}.workspace{padding:14px}.page-header,.dashboard-grid,.practice-layout,.analysis-grid,.syllabus-grid,.exam-workspace,.learning-summary,.learning-cards-grid,.glossary-grid{grid-template-columns:1fr}.learn-overview-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.learning-detail-head,.page-header{display:grid}.question-rail{position:static;max-height:160px}.exam-palette{position:static;max-height:132px;grid-template-columns:repeat(10,minmax(36px,1fr))}.rail-grid{grid-template-columns:repeat(8,minmax(36px,1fr))}}@media(max-width:620px){.metric-grid,.toolbar,.learn-tabs,.learn-overview-grid{grid-template-columns:1fr}.side-nav{grid-template-columns:repeat(3,1fr)}.nav-button,.logout-button{min-height:48px;padding:0 8px;font-size:13px}.analysis-tabs{grid-template-columns:repeat(2,1fr)}.question-card,.page-header,.panel{padding:16px}.page-header h1{font-size:24px}.question-card h2,.exam-question h2{font-size:18px}.question-actions,.pager{align-items:stretch;flex-direction:column}.diagram-flow,.diagram-node-wrap{align-items:stretch;display:grid}.diagram-node-wrap svg{transform:rotate(90deg);justify-self:center}.primary-button,.secondary-button{width:100%}}