:root{color-scheme:light;font-family:Inter,PingFang SC,Microsoft YaHei,Noto Sans CJK SC,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.6;font-weight:400;color:#1f2a33;background:#f7f3ec;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--paper: #fffdf8;--paper-strong: #fff6ec;--ink: #1f2a33;--muted: #66717d;--line: #eadfce;--red: #b64231;--red-soft: #fff0e8;--green: #28736d;--green-soft: #eaf7f3;--blue: #315f8c;--blue-soft: #edf5fb;--gold: #b98020;--gold-soft: #fff7dc;--violet: #5b5485;--shadow: 0 18px 55px rgb(63 48 31 / 11%);--radius: 8px}*{box-sizing:border-box}html{scroll-behavior:smooth;width:100%;overflow-x:hidden}body{margin:0;min-width:320px;min-height:100vh;width:100%;overflow-x:hidden;background:linear-gradient(180deg,#fffcf6e0,#f6f1e8f5),repeating-linear-gradient(90deg,rgb(54 98 116 / 5%) 0 1px,transparent 1px 80px)}#root{width:100%;overflow-x:hidden}body,button,input,textarea{font:inherit}button,a{min-height:44px}a{color:inherit;text-decoration:none}button{border:0}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3,h4,p,li,small,span,strong{overflow-wrap:anywhere}.app-shell{width:min(1440px,100%);min-width:0;margin:0 auto;padding:28px}.skip-link{position:fixed;top:12px;left:12px;z-index:20;padding:10px 14px;border-radius:6px;background:var(--ink);color:#fff;transform:translateY(-140%)}.skip-link:focus{transform:translateY(0)}.home-shell,.chapter-study-layout{width:100%;min-width:0;background:#fffdf8e5;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.home-shell{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(320px,.95fr);gap:24px;padding:30px}.home-shell.navigation-only{display:block;min-height:calc(100vh - 92px)}.home-copy{display:flex;flex-direction:column;justify-content:center;min-height:420px}.navigation-only .home-copy{min-height:0;padding:20px 0 10px}.eyebrow{display:inline-flex;align-items:center;gap:8px;width:fit-content;margin-bottom:12px;color:var(--red);font-size:.92rem;font-weight:800}.eyebrow.compact{margin-bottom:8px;color:var(--blue);font-size:.82rem}.home-copy h1{max-width:780px;margin-bottom:18px;font-size:2.65rem;line-height:1.15;letter-spacing:0}.home-copy p{max-width:720px;color:var(--muted);font-size:1.05rem}.home-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:14px}.home-actions a,.chapter-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--radius);font-weight:800}.home-actions a:first-child{padding:11px 16px;background:var(--red);color:#fff}.home-actions a:last-child{padding:10px 15px;border:1px solid var(--line);background:#fff;color:var(--ink)}.source-legend{display:grid;grid-template-columns:1fr;gap:14px;align-content:center}.source-legend>div{display:grid;grid-template-columns:48px 1fr;column-gap:14px;padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:#fffaf3}.source-legend strong,.source-legend p{grid-column:2}.source-legend strong{margin-top:1px;font-size:1.02rem}.source-legend p{margin-bottom:0;color:var(--muted)}.legend-icon{display:inline-grid;grid-row:1 / span 2;place-items:center;width:44px;height:44px;border-radius:var(--radius)}.legend-icon.textbook{background:var(--green-soft);color:var(--green)}.legend-icon.teacher{background:var(--gold-soft);color:var(--gold)}.legend-icon.note{background:var(--red-soft);color:var(--red)}.home-map{grid-column:1 / -1;padding-top:20px;border-top:1px solid var(--line)}.navigation-only .home-map{margin-top:16px}.home-map-head,.section-title-row,.chapter-hero{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}.home-map-head>*,.section-title-row>*,.chapter-hero>*{min-width:0}.home-map-head h2,.section-title-row h3,.chapter-hero h1{margin-bottom:0;line-height:1.25}.chapter-button-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;margin-top:16px}.chapter-button{min-height:76px;padding:10px;border:1px solid var(--line);background:#fff;color:var(--muted);text-align:center;flex-direction:column;cursor:not-allowed}.chapter-button span{color:var(--ink);font-weight:900}.chapter-button small{color:var(--muted)}.chapter-button.active{border-color:#b6423173;background:var(--red-soft);color:var(--red);cursor:pointer}.chapter-button.overview-entry{border-color:#315f8c57;background:var(--blue-soft);color:var(--blue)}.overview-page{min-height:calc(100vh - 92px);padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:#fffdf8f0;box-shadow:var(--shadow)}.overview-hero{padding-bottom:18px;border-bottom:1px solid var(--line)}.overview-hero h1{margin-bottom:10px;font-size:2.55rem;line-height:1.15}.overview-hero p{max-width:760px;color:var(--muted)}.overview-map-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:18px}.overview-card,.overview-exam-lane,.overview-study-order{border:1px solid var(--line);border-radius:var(--radius);background:#fffdfa}.overview-card{padding:15px}.overview-card>span{display:inline-flex;align-items:center;min-height:26px;padding:3px 8px;border-radius:999px;background:var(--green-soft);color:var(--green);font-size:.76rem;font-weight:900}.overview-card h2{margin:12px 0 8px;font-size:1.12rem}.overview-card p{color:#2f3c45}.overview-card small{color:var(--red);font-weight:800}.overview-exam-lane,.overview-study-order{margin-top:14px;padding:18px}.overview-exam-lane{display:grid;grid-template-columns:minmax(0,.9fr) minmax(320px,1.1fr);gap:18px}.overview-exam-lane h2,.overview-study-order h2{margin-bottom:8px}.overview-exam-lane p{margin-bottom:0;color:var(--muted)}.exam-lane-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.exam-lane-grid>div{padding:13px;border-radius:var(--radius);background:var(--blue-soft)}.exam-lane-grid svg{color:var(--blue)}.exam-lane-grid strong,.exam-lane-grid span{display:block}.exam-lane-grid strong{margin:7px 0 4px}.exam-lane-grid span{color:var(--muted)}.overview-study-order ol{margin:0;padding-left:22px}.overview-study-order li+li{margin-top:8px}.source-badge{display:inline-flex;align-items:center;width:fit-content;max-width:100%;min-height:32px;padding:5px 10px;border:1px solid rgb(40 115 109 / 22%);border-radius:999px;background:var(--green-soft);color:var(--green);font-size:.78rem;font-weight:800;line-height:1.45;white-space:normal}.source-badge.teacher{border-color:#b9802047;background:var(--gold-soft);color:#875d12}.chapter-study-layout{margin-top:26px;padding:28px}.chapter-back-link{display:inline-flex;align-items:center;gap:8px;width:fit-content;margin-bottom:18px;padding:9px 12px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;color:var(--muted);font-weight:800}.chapter-back-link:hover{color:var(--red);border-color:#b6423157}.chapter-hero{padding-bottom:20px;border-bottom:1px solid var(--line)}.chapter-hero h1{max-width:840px;font-size:2.05rem;word-break:break-word}.chapter-hero p{max-width:760px;margin:10px 0 0;color:var(--muted)}.chapter-source-panel{display:flex;flex-direction:column;align-items:flex-end;gap:8px;max-width:420px}.study-flow-shell{display:grid;grid-template-columns:minmax(260px,.62fr) minmax(520px,1.38fr);gap:16px;margin-top:20px;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:#fffdfa}.chapter-position,.chapter-narrative-block,.coverage-strip,.chapter-grid,.chapter-main,.textbook-lecture,.section-details,.subsection-details,.section-logic-map,.subsection-logic-board,.logic-map-track,.logic-unit,.logic-node,.paragraph-flow,.textbook-paragraph-card,.teacher-highlight,.choice-focus,.instant-recall,.embedded-short-answer,.teacher-recovery-panel,.exam-practice-panel{min-width:0}.chapter-position h3{margin-bottom:8px;font-size:1.25rem}.chapter-position p{margin-bottom:0;color:var(--muted)}.chapter-narrative-block ol{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:8px;margin:0;padding:0;list-style:none}.chapter-narrative-block li{padding:10px;border:1px solid rgb(49 95 140 / 16%);border-radius:var(--radius);background:var(--blue-soft)}.chapter-narrative-block span{color:var(--blue);font-size:.78rem;font-weight:900}.chapter-narrative-block strong{display:block;margin:3px 0}.chapter-narrative-block p{margin:0;color:var(--muted);font-size:.83rem}.coverage-strip{grid-column:1 / -1;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px}.coverage-strip div{padding:10px;border-radius:var(--radius);background:var(--green-soft);color:var(--green)}.coverage-strip strong,.coverage-strip span{display:block}.coverage-strip strong{font-size:1.28rem;line-height:1}.coverage-strip span{margin-top:3px;font-size:.8rem;font-weight:800}.chapter-grid{display:grid;grid-template-columns:320px minmax(0,1fr);gap:22px;margin-top:22px}.chapter-side{display:flex;flex-direction:column;gap:14px}.side-panel,.textbook-lecture,.teacher-recovery-panel,.exam-practice-panel{border:1px solid var(--line);border-radius:var(--radius);background:#fffdfa}.side-panel{padding:16px}.side-panel h3{display:flex;align-items:center;gap:8px;margin-bottom:14px;color:var(--ink);font-size:1rem}.linear-thread{list-style:none;margin:0;padding:0}.linear-thread li{position:relative;display:grid;grid-template-columns:44px 1fr;column-gap:10px;padding:0 0 18px}.linear-thread li:before{content:"";position:absolute;top:38px;left:21px;width:2px;height:calc(100% - 36px);background:var(--line)}.linear-thread li:last-child{padding-bottom:0}.linear-thread li:last-child:before{display:none}.linear-thread span{display:grid;place-items:center;width:44px;height:34px;border:1px solid rgb(49 95 140 / 18%);border-radius:999px;background:var(--blue-soft);color:var(--blue);font-weight:900}.linear-thread strong{line-height:1.1}.linear-thread p{grid-column:2;margin:4px 0 0;color:var(--muted);font-size:.91rem}.compact-list{margin:0;padding-left:19px;color:var(--muted)}.compact-list li+li{margin-top:8px}.chapter-main{min-width:0}.textbook-lecture,.teacher-recovery-panel,.exam-practice-panel{padding:18px}.teacher-recovery-panel,.exam-practice-panel{margin-top:18px}.section-details,.subsection-details{border:1px solid var(--line);border-radius:var(--radius);background:#fff}.section-details{margin-top:14px}.subsection-details{background:#fffdf8}.section-details+.section-details,.subsection-details+.subsection-details{margin-top:10px}.section-details>summary,.subsection-details>summary{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:56px;padding:12px 14px;cursor:pointer;list-style:none}.section-details>summary::-webkit-details-marker,.subsection-details>summary::-webkit-details-marker{display:none}.section-details>summary svg,.subsection-details>summary svg{flex:0 0 auto;color:var(--muted);transition:transform .16s ease}.section-details[open]>summary svg,.subsection-details[open]>summary svg{transform:rotate(180deg)}.section-details>summary strong,.subsection-details>summary strong{display:block;color:var(--ink)}.section-details>summary small,.subsection-details>summary small{display:block;margin-top:3px;color:var(--muted);font-size:.82rem}.summary-index{display:grid;place-items:center;flex:0 0 auto;width:42px;height:38px;border-radius:var(--radius);background:var(--red-soft);color:var(--red);font-weight:900}.section-question{margin:0 14px 14px;padding:10px 12px;border-left:4px solid var(--blue);background:var(--blue-soft);color:#244864;font-weight:800}.section-logic-map,.subsection-logic-board{margin:0 14px 14px;padding:12px;border:1px solid rgb(40 115 109 / 18%);border-radius:var(--radius);background:linear-gradient(135deg,#ecfaf5b8,#fffdf8f5),#fffdfa;overflow:hidden}.section-logic-map{border-color:#315f8c33;background:linear-gradient(135deg,#e5eefab8,#fffdf8f5),#fffdfa}.logic-map-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.logic-map-head span{display:inline-flex;align-items:center;min-height:25px;padding:3px 8px;border-radius:999px;background:#fff;color:var(--green);font-size:.76rem;font-weight:900}.section-logic-map .logic-map-head span{color:var(--blue)}.logic-map-head strong{color:var(--ink);text-align:right}.logic-map-track{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));gap:10px}.logic-unit{position:relative;min-width:0}.logic-node{position:relative;z-index:1;display:grid;grid-template-columns:34px minmax(0,1fr);gap:9px;height:100%;padding:10px;border:1px solid rgb(32 44 52 / 9%);border-radius:var(--radius);background:#ffffffe0;box-shadow:0 8px 20px #1f2e340d;transform-origin:left center}.logic-node>*{min-width:0}.logic-node-index{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:999px;background:var(--green-soft);color:var(--green);font-size:.74rem;font-weight:900}.section-logic-map .logic-node-index{background:var(--blue-soft);color:var(--blue)}.logic-node-label{display:inline-flex;margin-bottom:4px;color:var(--muted);font-size:.72rem;font-weight:900}.logic-node-title{display:block;color:var(--ink);font-size:.96rem;line-height:1.3;overflow-wrap:anywhere}.logic-node p{margin:5px 0 0;color:#37444c;font-size:.9rem;line-height:1.58;overflow-wrap:anywhere}.logic-connector{position:absolute;top:50%;right:-9px;z-index:0;width:18px;height:2px;border-radius:999px;background:linear-gradient(90deg,#28736d1f,#28736d7a);transform-origin:left center}.section-logic-map .logic-connector{background:linear-gradient(90deg,#315f8c1f,#315f8c7a)}.subsection-stack{padding:0 14px 14px}.subsection-meta{display:flex;flex-wrap:wrap;gap:8px;padding:0 14px 12px}.subsection-meta span{padding:4px 9px;border-radius:999px;background:#f4eee3;color:var(--muted);font-size:.78rem;font-weight:800}.memory-anchor{display:grid;grid-template-columns:92px 1fr;gap:10px;margin:0 14px 14px;padding:11px 12px;border-radius:var(--radius);background:var(--green-soft);color:var(--green)}.memory-anchor span{font-weight:900}.memory-anchor strong{color:#1c5752}.subsection-memory-map{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:0 14px 14px}.memory-map-node{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px;min-width:0;padding:10px;border:1px solid rgb(28 87 82 / 14%);border-radius:var(--radius);background:linear-gradient(135deg,#ecfaf5d1,#fffdf8f5),#fff}.memory-map-step{display:inline-grid;place-items:center;width:28px;height:28px;border:1px solid rgb(30 126 118 / 24%);border-radius:999px;background:#fffdf8;color:var(--green);font-size:.72rem;font-weight:900}.memory-map-label{display:inline-flex;align-items:center;margin-bottom:4px;color:var(--green);font-size:.75rem;font-weight:900}.memory-map-node p{margin:0;color:#2d3d3b;font-size:.9rem;line-height:1.6}.paragraph-flow{display:grid;gap:9px;margin-bottom:14px;padding:0 14px}.textbook-paragraph-card{display:grid;grid-template-columns:42px minmax(0,1fr);gap:10px;min-width:0;padding:10px 11px;border:1px solid rgb(32 44 52 / 9%);border-radius:var(--radius);background:#fffdfa}.paragraph-index{display:inline-grid;place-items:center;width:34px;height:34px;border:1px solid rgb(55 68 76 / 12%);border-radius:999px;background:#f8f3e9;color:var(--muted);font-size:.76rem;font-weight:900}.paragraph-tags{display:flex;flex-wrap:wrap;align-items:center;gap:5px;margin-bottom:6px}.paragraph-role,.paragraph-kind{display:inline-flex;align-items:center;padding:2px 8px;border-radius:999px;font-size:.72rem;font-weight:900}.paragraph-role{background:#1f74661a;color:#277064}.paragraph-kind{background:#37444c12;color:var(--muted)}.paragraph-cue{display:block;margin:0 0 5px;color:#172128;font-size:.94rem;line-height:1.55}.study-step-label{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 14px 10px;padding:7px 10px;border-radius:var(--radius);background:#f4eee3}.study-step-label span{color:var(--muted);font-size:.76rem;font-weight:900}.study-step-label strong{color:var(--ink)}.textbook-paragraph-card p{margin:0;color:#2a333a;line-height:1.78}.textbook-paragraph-card.para-primary{border-left:4px solid var(--red);background:linear-gradient(90deg,#fff0e8e0,#fffdf8f5),#fff;font-weight:700}.textbook-paragraph-card.para-secondary{border-left:4px solid var(--gold);background:linear-gradient(90deg,#fff6dfeb,#fffdf8f5),#fff}.textbook-paragraph-card.para-exam{border-left:4px solid var(--blue);background:linear-gradient(90deg,#e5eefae0,#fffdf8f5),#fff}.textbook-paragraph-card.para-note{border-left:4px solid var(--green);background:linear-gradient(90deg,#ebfaf5e5,#fffdf8f5),#fff}.teacher-highlight{margin:0 14px 14px;padding:12px;border:1px solid rgb(185 128 32 / 24%);border-radius:var(--radius);background:linear-gradient(90deg,var(--gold-soft),#fffdf8)}.teacher-highlight h4,.choice-focus h4{display:flex;align-items:center;gap:8px;margin-bottom:8px;color:#7a540d;font-size:.95rem}.teacher-highlight p{margin-bottom:8px;font-weight:700}.teacher-highlight p:last-child{margin-bottom:0}.note-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:0 14px 14px}.inline-note-emphasis{padding:12px;border:1px solid rgb(182 66 49 / 24%);border-left:4px solid var(--red);border-radius:var(--radius);background:linear-gradient(90deg,#fff0e8d1,#fffdf8f5),#fff}.user-note-card{padding:0;border:0;border-radius:0;background:transparent}.user-note-card>div{display:flex;align-items:center;gap:7px;margin-bottom:6px;color:var(--red);font-size:.82rem;font-weight:900}.user-note-card strong{display:block;margin-bottom:5px}.user-note-card p{margin-bottom:7px;color:#573327;font-size:.94rem}.user-note-card small{color:var(--muted)}.choice-focus{margin:0 14px 14px;padding:12px;border-radius:var(--radius);background:#f7f8f6}.choice-focus h4{color:var(--blue)}.choice-focus ul{margin:0;padding-left:0;list-style:none}.choice-focus li+li{margin-top:8px}.embedded-short-answer,.instant-recall{margin:0 14px 14px;padding:12px;border-radius:var(--radius)}.embedded-short-answer{border:1px solid rgb(182 66 49 / 22%);border-left:4px solid var(--red);background:var(--red-soft)}.embedded-short-answer h4,.instant-recall h4{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-size:.95rem}.embedded-short-answer h4{color:var(--red)}.embedded-short-answer>strong{display:block;margin-bottom:8px}.answer-collapse{display:block}.answer-inline-summary{display:block;cursor:pointer;list-style:none;line-height:1.65}.answer-inline-summary::-webkit-details-marker{display:none}.question-text{display:inline;min-width:0;font-weight:800}.answer-toggle-button{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:24px;margin-left:6px;padding:2px 7px;border:1px solid transparent;border-radius:7px;cursor:pointer;font-size:.72rem;font-weight:900;line-height:1.1;white-space:nowrap;-webkit-user-select:none;user-select:none;box-shadow:inset 0 -1px #ffffffb3;vertical-align:.08em;transition:border-color .14s ease,background .14s ease,transform .14s ease}.answer-toggle-button:after{content:"";width:5px;height:5px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:translateY(-1px) rotate(45deg);transition:transform .14s ease}.answer-collapse[open]>.answer-inline-summary .answer-toggle-button:after{transform:translateY(1px) rotate(225deg)}.answer-toggle-button:hover{transform:translateY(-1px)}.choice-answer-details .answer-toggle-button{border-color:#315f8c2e;background:#edf5fbb8;color:var(--blue)}.recall-answer-details .answer-toggle-button{border-color:#28736d2e;background:#eaf7f3cc;color:var(--green)}.full-score-answer-details .answer-toggle-button{border-color:#b642312e;background:#fff0e8d1;color:var(--red)}.answer-body{margin:7px 0 0;border-radius:var(--radius);background:#fffdfa;line-height:1.75}.choice-answer-details .visual-answer-body{border:1px solid rgb(49 95 140 / 18%);color:#263f56}.recall-answer-details .visual-answer-body{border:1px solid rgb(40 115 109 / 20%);color:#2b4b47}.visual-answer-body{display:grid;gap:8px;padding:8px}.answer-segment{display:grid;grid-template-columns:74px minmax(0,1fr);gap:10px;align-items:start;padding:9px 10px;border:1px solid rgb(40 115 109 / 12%);border-left:4px solid rgb(40 115 109 / 42%);border-radius:10px;background:linear-gradient(90deg,#eaf7f3bd,#fffdfa 46%)}.visual-answer-body.is-choice .answer-segment{border-color:#315f8c24;border-left-color:#315f8c6b;background:linear-gradient(90deg,#edf5fbc7,#fffdfa 46%)}.answer-segment-marker{display:flex;flex-direction:column;align-items:flex-start;gap:5px}.answer-segment-index{display:inline-flex;align-items:center;justify-content:center;min-width:29px;height:24px;border-radius:999px;background:#fff;color:var(--green);font-size:.74rem;font-weight:950;box-shadow:0 0 0 1px #28736d29}.visual-answer-body.is-choice .answer-segment-index{color:var(--blue);box-shadow:0 0 0 1px #315f8c29}.answer-cue{display:inline-flex;max-width:100%;padding:2px 6px;border-radius:999px;background:#28736d1a;color:var(--green);font-size:.7rem;font-weight:900;line-height:1.25;word-break:keep-all}.visual-answer-body.is-choice .answer-cue{background:#315f8c1a;color:var(--blue)}.answer-segment p{margin:0;color:inherit}.answer-keyword{padding:1px 4px;border-radius:6px;background:linear-gradient(180deg,transparent 44%,rgb(246 201 90 / 52%) 0);color:#26343d;font-weight:950}.full-score-answer-details ol.answer-body{padding:10px;border:1px solid rgb(182 66 49 / 22%);color:#3d302d;list-style:none;counter-reset:full-score-answer}.full-score-answer-details li{position:relative;padding:10px 12px 10px 42px;border:1px solid rgb(182 66 49 / 13%);border-radius:10px;background:linear-gradient(90deg,#fff0e8c2,#fffdfa 54%);counter-increment:full-score-answer}.full-score-answer-details li:before{content:counter(full-score-answer,decimal-leading-zero);position:absolute;top:12px;left:10px;display:inline-flex;align-items:center;justify-content:center;min-width:24px;height:22px;border-radius:999px;background:#fff;color:var(--red);font-size:.7rem;font-weight:950;box-shadow:0 0 0 1px #b6423129}.full-score-answer-details li+li{margin-top:8px}.full-score-answer-details li strong{display:block;margin-bottom:4px;color:var(--ink)}.full-score-answer-details li span{display:block;color:#3d302d;line-height:1.75}.instant-recall ul{margin:0;padding-left:0;list-style:none}.instant-recall li+li{margin-top:6px}.instant-recall{border:1px solid rgb(40 115 109 / 18%);background:var(--green-soft)}.instant-recall h4{color:var(--green)}.short-answer-question-row{margin-top:10px}.mapping-grid,.practice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:14px}.mapping-card,.practice-card,.short-answer-card{border:1px solid var(--line);border-radius:var(--radius);background:#fff}.mapping-card,.practice-card{padding:13px}.mapping-card>span,.practice-card>span,.short-answer-card>span{display:inline-flex;align-items:center;min-height:26px;padding:3px 8px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-size:.76rem;font-weight:900}.mapping-card h4,.practice-card h4{margin:9px 0 7px;line-height:1.35}.mapping-card p,.practice-card p{margin-bottom:8px;color:#2d3840}.mapping-card small{color:var(--muted)}.teacher-original-panel{background:linear-gradient(180deg,#fff6dfb8,#fffdf8f0),#fffdfa}.teacher-original-grid{display:grid;gap:10px;margin-top:14px}.teacher-original-card{border:1px solid rgb(185 128 32 / 24%);border-radius:var(--radius);background:#fff;overflow:hidden}.teacher-original-card>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:52px;padding:12px 14px;cursor:pointer;list-style:none}.teacher-original-card>summary::-webkit-details-marker{display:none}.teacher-original-card>summary strong{display:block;color:var(--ink)}.teacher-original-card>summary small{display:block;margin-top:3px;color:var(--muted);line-height:1.4}.teacher-original-lines{display:grid;gap:8px;margin:0;padding:0 14px 14px;list-style:none}.teacher-original-lines li{display:grid;grid-template-columns:34px minmax(0,1fr);gap:10px;padding:10px;border:1px solid rgb(32 44 52 / 8%);border-radius:var(--radius);background:#fffdfa}.teacher-original-lines li>span{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:999px;background:var(--gold-soft);color:#7d5612;font-size:.74rem;font-weight:900}.teacher-original-lines p{margin:0;color:#2d3840;line-height:1.78}.practice-card .trap{color:#744333}.practice-answer-details{margin-top:10px}.practice-answer-details>summary{padding:8px 9px;border:1px solid rgb(49 95 140 / 16%);border-radius:var(--radius);background:#edf5fb9e}.practice-answer-details>summary .question-text{background:transparent;color:var(--ink);font-size:.9rem;font-weight:800}.practice-answer-stack{display:grid;gap:9px;margin-top:9px}.practice-signal-block,.practice-trap-block{min-width:0}.practice-signal-block>strong,.practice-trap-block>strong{display:inline-flex;margin-bottom:6px;padding:2px 7px;border-radius:999px;font-size:.72rem;font-weight:950}.practice-signal-block>strong{background:#315f8c1a;color:var(--blue)}.practice-trap-block{padding:10px;border:1px solid rgb(182 66 49 / 16%);border-left:4px solid rgb(182 66 49 / 38%);border-radius:10px;background:linear-gradient(90deg,#fff0e8b8,#fffdfa 56%)}.practice-trap-block>strong{background:#b642311a;color:var(--red)}.practice-trap-block p{margin:0;color:#744333;line-height:1.75}.short-answer-card{margin-top:14px;padding:16px}.short-answer-card>span{background:var(--gold-soft);color:#805a15}.short-answer-card .question-text{font-size:1.1rem;line-height:1.55}.short-answer-card ol{margin:0;padding-left:22px}.short-answer-card li+li{margin-top:8px}.formula{margin:14px 0 0;padding:10px 12px;border-left:4px solid var(--red);background:var(--red-soft);color:var(--red);font-weight:900}.chapter-button.practice-entry{border-color:#28736d57;background:var(--green-soft);color:var(--green)}.practice-shell{min-height:calc(100vh - 92px);padding:28px;border:1px solid var(--line);border-radius:var(--radius);background:#fffdf8f0;box-shadow:var(--shadow)}.practice-hero{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding-bottom:20px;border-bottom:1px solid var(--line)}.practice-hero h1{margin-bottom:8px;font-size:2.15rem;line-height:1.15}.practice-hero p{max-width:720px;margin-bottom:0;color:var(--muted)}.practice-stat-strip{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px;max-width:480px}.practice-stat-strip span,.practice-chip{display:inline-flex;align-items:center;width:fit-content;min-height:30px;padding:5px 10px;border-radius:999px;font-size:.78rem;font-weight:900}.practice-stat-strip span{border:1px solid rgb(40 115 109 / 18%);background:var(--green-soft);color:var(--green)}.practice-tabbar{display:inline-flex;flex-wrap:wrap;gap:8px;margin-top:18px;padding:6px;border:1px solid var(--line);border-radius:var(--radius);background:#fffaf3}.practice-tabbar button,.practice-filter-row button,.practice-filter-group select,.practice-action-row button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-width:0;min-height:42px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;color:var(--ink);font-weight:900;cursor:pointer}.practice-filter-group select{display:block;width:100%;padding:8px 10px;-webkit-appearance:none;-moz-appearance:none;appearance:none}.practice-tabbar button{padding:8px 13px}.practice-tabbar button.active,.practice-filter-row button.active{border-color:#b642315c;background:var(--red-soft);color:var(--red)}.practice-workspace{display:grid;grid-template-columns:minmax(180px,.28fr) minmax(0,1fr);gap:14px;margin-top:16px}.practice-side-panel{display:grid;gap:10px;align-content:start}.practice-side-panel>div{min-width:0;padding:14px;border:1px solid var(--line);border-radius:var(--radius);background:#fffdfa}.practice-side-panel strong,.practice-side-panel span{display:block}.practice-side-panel strong{color:var(--red);font-size:1.35rem;line-height:1.2}.practice-side-panel span{color:var(--muted);font-size:.84rem;font-weight:800}.practice-choice-card,.practice-short-card{min-width:0;padding:18px;background:#fffdf9}.practice-card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:16px}.practice-card-head>*{min-width:0}.practice-card-head h2{margin:8px 0 0;font-size:1.18rem;line-height:1.35}.practice-chip{border:1px solid rgb(49 95 140 / 20%);background:var(--blue-soft);color:var(--blue)}.practice-filter-row{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:7px}.practice-filter-row button{padding:7px 10px;font-size:.86rem}.practice-control-board{display:grid;grid-template-columns:minmax(170px,.8fr) minmax(260px,1.4fr) minmax(170px,.8fr);gap:10px;margin-bottom:16px;padding:12px;border:1px solid var(--line);border-radius:var(--radius);background:#fffaf3}.practice-short-filter-board{grid-template-columns:minmax(0,1fr)}.practice-filter-group{display:grid;gap:7px;min-width:0}.practice-filter-group>span{color:var(--muted);font-size:.78rem;font-weight:900}.practice-question-text{margin-bottom:16px;color:#1f2a33;font-size:1.08rem;font-weight:850;line-height:1.72}.practice-question-heading{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:start;gap:10px;margin-bottom:16px}.practice-question-heading .practice-question-text{margin-bottom:0}.practice-short-materials{display:grid;gap:10px;margin:-4px 0 14px}.practice-short-material{padding:12px;border:1px solid rgb(49 95 140 / 16%);border-radius:var(--radius);background:#edf5fb7a}.practice-short-material h3{margin:0 0 7px;color:var(--blue);font-size:.92rem;line-height:1.35}.practice-short-material p{margin:0;color:#2c3a43;font-size:.95rem;font-weight:650;line-height:1.78;white-space:pre-wrap}.practice-question-kind{display:inline-flex;align-items:center;justify-content:center;min-width:58px;margin-top:4px;padding:5px 8px;border:1px solid rgb(49 95 140 / 20%);border-radius:999px;background:var(--blue-soft);color:var(--blue);font-size:.78rem;font-weight:950;line-height:1.2;white-space:nowrap}.practice-question-kind.multiple{border-color:#b6423133;background:var(--red-soft);color:var(--red)}.practice-memory-cue{margin:-4px 0 14px;padding:10px 12px;border-left:4px solid var(--gold);border-radius:var(--radius);background:var(--gold-soft);color:#765313;font-weight:900}.practice-choice-list{display:grid;gap:9px}.practice-choice-option{display:grid;grid-template-columns:38px minmax(0,1fr);gap:10px;align-items:start;width:100%;min-height:54px;padding:10px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;color:var(--ink);text-align:left;cursor:pointer}.practice-choice-option span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-weight:950}.practice-choice-option strong{min-width:0;padding-top:3px;font-weight:750;line-height:1.65}.practice-choice-option.selected{border-color:#315f8c70;background:#edf5fba8}.practice-choice-option.correct{border-color:#28736d70;background:var(--green-soft)}.practice-choice-option.correct span{background:#fff;color:var(--green)}.practice-choice-option.wrong{border-color:#b6423170;background:var(--red-soft)}.practice-choice-option.wrong span{background:#fff;color:var(--red)}.practice-empty-state{display:grid;gap:6px;margin-top:16px;padding:18px;border:1px dashed rgb(49 95 140 / 26%);border-radius:var(--radius);background:#edf5fb75;color:var(--muted)}.practice-empty-state strong{color:var(--ink);font-size:1.03rem}.practice-action-row{display:flex;flex-wrap:wrap;gap:9px;margin-top:16px}.practice-action-row.compact{margin-top:12px}.practice-action-row button{padding:9px 13px}.practice-action-row button:disabled{cursor:not-allowed;opacity:.48}.practice-action-row .primary-action{border-color:#b6423147;background:var(--red);color:#fff}.practice-answer-panel{margin-top:16px;padding:14px;border:1px solid rgb(49 95 140 / 18%);border-radius:var(--radius);background:#fff}.practice-answer-panel.correct{border-color:#28736d4d;background:var(--green-soft)}.practice-answer-panel.wrong{border-color:#b6423147;background:var(--red-soft)}.practice-answer-panel>div:first-child:not(.practice-answer-sections){display:inline-flex;align-items:center;gap:7px;margin-bottom:8px;font-weight:950}.practice-answer-panel p{margin-bottom:0;color:#25313a;line-height:1.78;white-space:pre-wrap}.practice-choice-explanation{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.practice-choice-explanation-item{min-width:0;padding:.8rem .9rem;border:1px solid rgb(121 84 38 / 18%);border-radius:8px;background:#fffbf4c2}.practice-choice-explanation-item span{display:inline-flex;margin-bottom:.35rem;color:#8a4b1f;font-size:.83rem;font-weight:950}.practice-choice-explanation-item p{margin:0;color:#25313a;font-size:.96rem;line-height:1.72}.practice-answer-sections{display:grid;grid-template-columns:minmax(0,1fr);align-items:stretch;gap:12px}.practice-answer-section{display:flex;flex-direction:column;gap:9px;padding:12px;border:1px solid rgb(49 95 140 / 16%);border-radius:var(--radius);background:#fffdfa}.practice-answer-section h3{margin-bottom:0;font-size:1rem;line-height:1.35}.practice-answer-points{display:grid;gap:8px}.practice-answer-points p{margin:0}.practice-answer-panel mark,.practice-answer-keyword{padding:1px 7px;border-radius:999px;background:#c939391a;color:var(--red);font-weight:950}.practice-source-images{margin-top:12px}.practice-source-images summary{width:fit-content;padding:7px 10px;border:1px solid var(--line);border-radius:var(--radius);background:#fffdfa;color:var(--muted);font-weight:900;cursor:pointer}.practice-source-images img{display:block;width:min(100%,720px);height:auto;margin-top:10px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}.site-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;padding:24px 4px 4px;color:var(--muted)}.site-footer strong{color:var(--ink)}@media(max-width:980px){.app-shell{padding:18px}.home-shell{grid-template-columns:1fr}.home-copy{min-height:0}.home-copy h1{font-size:2.35rem}.chapter-button-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.overview-map-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.overview-exam-lane,.study-flow-shell{grid-template-columns:1fr}.chapter-narrative-block ol,.coverage-strip,.subsection-memory-map,.logic-map-track{grid-template-columns:repeat(2,minmax(0,1fr))}.chapter-hero,.chapter-grid,.practice-hero,.practice-card-head{display:block}.practice-stat-strip,.practice-filter-row{justify-content:flex-start;margin-top:12px}.practice-workspace,.practice-control-board,.practice-choice-explanation{grid-template-columns:minmax(0,1fr)}.practice-side-panel{grid-template-columns:repeat(3,minmax(0,1fr))}.chapter-source-panel{align-items:flex-start;width:100%;max-width:100%;margin-top:14px}.chapter-side{margin-bottom:18px}}@media(max-width:720px){.app-shell{width:100vw;max-width:100vw;padding:8px;overflow-x:hidden}.home-shell,.overview-page,.chapter-study-layout,.practice-shell{max-width:calc(100vw - 16px);padding:14px;overflow-x:hidden}.study-flow-shell,.textbook-lecture,.teacher-recovery-panel,.exam-practice-panel{width:min(100%,calc(100vw - 44px));max-width:calc(100vw - 44px);padding:12px;overflow-x:hidden}.home-copy h1{font-size:2rem}.home-actions,.home-map-head,.section-title-row{flex-direction:column;align-items:flex-start}.home-actions a{width:100%}.chapter-button-grid,.overview-map-grid,.exam-lane-grid,.chapter-narrative-block ol,.coverage-strip,.note-grid,.mapping-grid,.practice-grid,.practice-side-panel{grid-template-columns:minmax(0,1fr);width:100%;max-width:100%}.practice-hero h1{font-size:1.7rem}.practice-tabbar,.practice-tabbar button,.practice-action-row button{width:100%}.practice-choice-card,.practice-short-card{padding:13px}.practice-choice-option{grid-template-columns:34px minmax(0,1fr);padding:9px}.practice-choice-option span{width:30px;height:30px}.practice-answer-sections,.practice-answer-section{grid-template-columns:minmax(0,1fr)}.chapter-position,.chapter-narrative-block,.chapter-narrative-block li,.coverage-strip div,.side-panel,.section-details,.subsection-details,.logic-node,.textbook-paragraph-card,.teacher-highlight,.choice-focus,.instant-recall{max-width:100%;min-width:0}.chapter-narrative-block ol,.chapter-narrative-block li,.coverage-strip,.coverage-strip div{width:min(100%,calc(100vw - 68px));max-width:calc(100vw - 68px)}.subsection-memory-map{grid-template-columns:minmax(0,1fr)}.logic-map-head{flex-direction:column;align-items:flex-start}.logic-map-head strong{text-align:left}.logic-map-track{grid-template-columns:minmax(0,1fr)}.logic-node{grid-template-columns:1fr}.logic-connector{top:auto;right:auto;bottom:-10px;left:23px;width:2px;height:20px;transform-origin:top center}.chapter-hero h1{max-width:100%;font-size:1.55rem}.section-details>summary,.subsection-details>summary{align-items:flex-start;gap:10px;padding:11px}.section-question,.section-logic-map,.subsection-logic-board,.memory-anchor{margin-right:10px;margin-left:10px}.subsection-stack{padding-right:10px;padding-left:10px}.memory-anchor{grid-template-columns:1fr}.textbook-paragraph-card{grid-template-columns:minmax(0,1fr)}.teacher-original-card>summary{align-items:flex-start;flex-direction:column}.teacher-original-lines li{grid-template-columns:1fr}.paragraph-index{width:fit-content;min-width:34px}.visual-answer-body{padding:7px}.answer-segment{grid-template-columns:1fr;gap:7px;padding:10px}.answer-segment-marker{flex-direction:row;align-items:center;flex-wrap:wrap}.source-badge{display:flex;width:100%;min-width:0;border-radius:var(--radius)}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}
