:root{color-scheme:light;--bg:oklch(.985 .004 250);--surface:oklch(1 0 0);--ink:oklch(.22 .018 250);--muted:oklch(.47 .018 250);--olive:oklch(.43 .11 113);--olive-soft:oklch(.95 .025 113);--blue:oklch(.42 .12 250);--amber:oklch(.48 .13 48);--line:oklch(.9 .012 250);--mono:"DM Mono",ui-monospace,SFMono-Regular,Consolas,monospace;--sans:Manrope,"Microsoft YaHei",system-ui,sans-serif;--rail:252px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.72 var(--sans);-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{text-decoration-thickness:2px}button,input{font:inherit}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid var(--blue);outline-offset:3px}.skip-link{position:fixed;z-index:10;top:8px;left:8px;padding:8px 14px;transform:translateY(-150%);background:var(--surface);border:1px solid var(--line);border-radius:8px}.skip-link:focus{transform:none}.layout{min-height:100vh}.rail{position:fixed;inset:0 auto 0 0;width:var(--rail);padding:26px 18px 20px 22px;background:var(--surface);border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:2}.brand{display:flex;align-items:center;gap:11px;padding:0 8px 28px;color:var(--ink);text-decoration:none}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:11px;background:var(--olive);color:white;font-weight:800;font-size:18px}.brand-name{font-weight:800;letter-spacing:-.04em;font-size:20px}.brand-caption{font-size:11px;color:var(--muted);line-height:1.2;display:block;letter-spacing:.02em}.nav-label{padding:0 10px;margin:0 0 8px;color:var(--muted);font-size:11px;font-weight:700;letter-spacing:.08em}.nav{display:grid;gap:3px}.nav a{display:flex;align-items:center;gap:11px;padding:9px 10px;border-radius:8px;text-decoration:none;color:var(--muted);font-size:13px;font-weight:600;transition:background .18s ease,color .18s ease}.nav a:hover{background:var(--bg);color:var(--ink)}.nav a[aria-current=page]{background:var(--olive-soft);color:var(--olive);font-weight:700}.nav-icon{width:20px;text-align:center;font-family:var(--mono);font-size:12px;opacity:.8}.rail-bottom{margin-top:auto;border-top:1px solid var(--line);padding:15px 8px 0;color:var(--muted);font-size:11px}.rail-bottom strong{color:var(--ink);display:block;font-size:12px;margin-bottom:3px}.main{margin-left:var(--rail);min-height:100vh}.topline{height:58px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 clamp(22px,5vw,68px);background:color-mix(in oklab,var(--bg),white 45%)}.crumb{font-size:12px;color:var(--muted)}.crumb b{color:var(--ink);font-weight:700}.top-meta{font:11px var(--mono);color:var(--muted)}.content{width:min(100%,1110px);padding:50px clamp(22px,5vw,68px) 84px;margin:0 auto}.page-head{max-width:780px;margin-bottom:35px}.eyebrow{display:inline-flex;align-items:center;gap:7px;color:var(--olive);font-size:11px;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.eyebrow:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--olive)}h1,h2,h3{line-height:1.25;letter-spacing:-.035em;text-wrap:balance}h1{font-size:clamp(34px,5vw,54px);margin:11px 0 13px;font-weight:800}h2{font-size:25px;margin:0 0 15px}h3{font-size:17px;margin:24px 0 8px}.lead{font-size:16px;line-height:1.75;color:var(--muted);max-width:65ch;margin:0}.head-row{display:flex;align-items:flex-end;justify-content:space-between;gap:20px}.priority{flex:none;padding:5px 10px;border:1px solid var(--line);border-radius:99px;font-size:11px;color:var(--muted);font-weight:700}.section{margin-top:38px}.section-title{display:flex;align-items:baseline;justify-content:space-between;gap:18px;margin-bottom:15px}.section-title h2{margin:0;font-size:21px}.section-note{font-size:12px;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:14px}.span-4{grid-column:span 4}.span-6{grid-column:span 6}.span-8{grid-column:span 8}.span-12{grid-column:span 12}.panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:20px 21px;min-width:0}.panel h3:first-child{margin-top:0}.panel p:last-child{margin-bottom:0}.panel-link{color:inherit;text-decoration:none;display:block;transition:border-color .18s ease,transform .18s ease}.panel-link:hover{border-color:var(--olive);transform:translateY(-2px)}.module-name{font-size:17px;font-weight:800;letter-spacing:-.025em;margin:8px 0 4px}.module-desc{font-size:13px;color:var(--muted);margin:0}.module-foot{display:flex;justify-content:space-between;align-items:center;margin-top:17px;font-size:11px;color:var(--muted)}.stars{color:var(--amber);letter-spacing:.07em}.formula{padding:15px 17px;background:var(--olive-soft);border:1px solid color-mix(in oklab,var(--olive),white 78%);border-radius:9px;font:14px/1.85 var(--mono);overflow-x:auto;color:var(--ink);margin:12px 0 17px;white-space:normal}.formula strong{font-family:var(--sans);color:var(--olive)}.callout{border:1px solid var(--line);border-radius:9px;padding:15px 17px;margin:16px 0;background:var(--surface)}.callout.tip{background:var(--olive-soft);border-color:color-mix(in oklab,var(--olive),white 78%)}.callout.warn{background:oklch(.97 .025 48);border-color:oklch(.89 .06 48)}.callout-title{display:block;font-weight:800;margin-bottom:4px;font-size:13px}.callout p{margin:0;font-size:13px}.list{padding-left:1.2em;margin:8px 0}.list li{padding:3px 0}.list li::marker{color:var(--olive)}table{width:100%;border-collapse:collapse;font-size:13px}th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}th{color:var(--muted);font-size:11px;letter-spacing:.04em;font-weight:700}tr:last-child td{border-bottom:0}.tag{display:inline-block;padding:2px 8px;background:var(--olive-soft);color:var(--olive);font-weight:700;font-size:11px;border-radius:99px;white-space:nowrap}.muted{color:var(--muted)}.mono{font-family:var(--mono)}.checklist{display:grid;gap:9px}.check-row{display:flex;align-items:flex-start;gap:10px;padding:9px 0;border-bottom:1px solid var(--line);font-size:13px}.check-row:last-child{border:0}.check-row input{margin:4px 0 0;accent-color:var(--olive);width:16px;height:16px;flex:none}.check-row:has(input:checked) span{text-decoration:line-through;color:var(--muted)}.progress-track{height:7px;background:var(--line);border-radius:9px;overflow:hidden;margin:12px 0 7px}.progress-fill{height:100%;width:0;background:var(--olive);border-radius:inherit;transition:width .25s ease}.progress-caption{font-size:11px;color:var(--muted)}.steps{counter-reset:step;display:grid;gap:12px}.step{counter-increment:step;display:grid;grid-template-columns:30px 1fr;gap:12px;align-items:start}.step:before{content:counter(step);display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--olive-soft);color:var(--olive);font:12px var(--mono);font-weight:700}.step p{margin:2px 0;color:var(--muted);font-size:13px}.step strong{color:var(--ink)}.page-footer{border-top:1px solid var(--line);padding-top:18px;margin-top:48px;font-size:11px;color:var(--muted);display:flex;justify-content:space-between;gap:12px}.mobile-brand{display:none}
@media(max-width:900px){:root{--rail:214px}.content{padding-top:38px}.span-4{grid-column:span 6}.span-8{grid-column:span 12}}
@media(max-width:680px){.rail{position:relative;width:auto;height:auto;padding:12px 15px 10px;border-right:0;border-bottom:1px solid var(--line)}.brand{padding:0 4px 11px}.brand-mark{width:32px;height:32px}.brand-name{font-size:18px}.nav-label,.rail-bottom{display:none}.nav{display:flex;overflow-x:auto;gap:4px;padding-bottom:2px;scrollbar-width:thin}.nav a{white-space:nowrap;padding:8px 10px;font-size:12px;gap:6px}.nav-icon{width:auto}.main{margin:0}.topline{height:44px;padding:0 18px}.content{padding:30px 18px 55px}.head-row{align-items:flex-start;flex-direction:column;gap:9px}h1{font-size:36px}.lead{font-size:14px}.grid{gap:10px}.span-4,.span-6{grid-column:span 12}.panel{padding:17px}.section{margin-top:30px}.page-footer{flex-direction:column}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
.exercise-list{display:grid;gap:10px}.exercise-item{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center;padding:13px 0;border-bottom:1px solid var(--line)}.exercise-item:last-child{border:0}.exercise-item h3{font-size:14px;letter-spacing:-.01em;margin:0 0 3px}.exercise-item p{font-size:12px;color:var(--muted);margin:0}.exercise-meta{font:10px var(--mono);color:var(--muted);margin-right:7px}.exercise-actions{display:flex;align-items:center;gap:12px;white-space:nowrap}.exercise-actions a{font-size:11px;font-weight:700}.exercise-actions .exercise-question-link{color:var(--ink);font-weight:800;text-decoration:underline;text-underline-offset:3px}.exercise-actions .exercise-question-link:hover{color:var(--muted)}.exercise-check{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:5px}.exercise-check input{accent-color:var(--olive);width:16px;height:16px}
@media(max-width:680px){.exercise-item{grid-template-columns:1fr;gap:8px}.exercise-actions{justify-content:space-between}}
.worked-example{margin:15px 0 0;padding:14px 15px;background:var(--olive-soft);border:1px solid color-mix(in oklab,var(--olive),white 78%);border-radius:9px;font-size:13px;line-height:1.65}.worked-example b{display:block;color:var(--olive);font-size:12px;margin-bottom:5px}.worked-example p{margin:4px 0}.worked-example .answer{font-family:var(--mono);font-size:12px;color:var(--ink)}.worked-example .mistake{color:var(--amber);font-weight:700}.example-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.example-grid .worked-example{margin:0}.inline-example{margin-top:10px}
@media(max-width:680px){.example-grid{grid-template-columns:1fr}}

/* 阅读字号上调一档，例题改为更完整、醒目的演示卡片 */
body{font-size:16px}
.brand-caption{font-size:12px}
.nav-label{font-size:12px}
.nav a{font-size:14px}
.nav-icon{font-size:13px}
.rail-bottom{font-size:12px}
.rail-bottom strong{font-size:13px}
.crumb{font-size:13px}
.top-meta{font-size:12px}
.eyebrow{font-size:12px}
h2{font-size:27px}
h3{font-size:18px}
.lead{font-size:17px}
.section-title h2{font-size:23px}
.section-note{font-size:13px}
.module-desc{font-size:14px}
.module-foot{font-size:12px}
.formula{font-size:15px}
.callout-title{font-size:14px}
.callout p{font-size:14px}
.list{font-size:16px}
table{font-size:14px}
th{font-size:12px}
.tag{font-size:12px}
.check-row{font-size:14px}
.progress-caption{font-size:12px}
.step p{font-size:14px}
.page-footer{font-size:12px}
.exercise-item h3{font-size:15px}
.exercise-item p{font-size:13px}
.exercise-meta{font-size:11px}
.exercise-actions a,.exercise-check{font-size:12px}
.worked-example{margin-top:19px;padding:21px 23px;background:linear-gradient(135deg,var(--olive-soft),color-mix(in oklab,var(--surface),var(--olive-soft) 45%));border:1px solid color-mix(in oklab,var(--olive),white 65%);border-left:5px solid var(--olive);border-radius:12px;font-size:16px;line-height:1.8;box-shadow:0 5px 18px color-mix(in oklab,var(--olive),transparent 91%)}
.worked-example b{font-size:15px;margin-bottom:10px;letter-spacing:.01em}
.worked-example p{margin:8px 0}
.worked-example .answer{display:block;margin-top:12px;padding-top:10px;border-top:1px solid color-mix(in oklab,var(--olive),white 70%);font-family:var(--sans);font-size:15px;font-weight:700}
.worked-example .mistake{font-size:15px}
@media(max-width:680px){.lead{font-size:16px}.nav a{font-size:13px}.formula{font-size:14px}.worked-example{padding:17px 18px}.worked-example b{font-size:14px}}

.example-section{scroll-margin-top:18px}
.example-nav{position:sticky;top:0;z-index:1;display:flex;flex-wrap:wrap;gap:8px;padding:13px;margin:0 0 16px;background:color-mix(in oklab,var(--surface),transparent 6%);border:1px solid var(--line);border-radius:12px;backdrop-filter:blur(12px)}
.example-nav a{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:var(--olive-soft);color:var(--ink);font-size:13px;font-weight:700;text-decoration:none;transition:transform .18s ease,filter .18s ease}
.example-nav a:hover{transform:translateY(-1px);filter:saturate(1.2)}
.example-nav a:nth-child(6n+1){background:oklch(.94 .04 145)}
.example-nav a:nth-child(6n+2){background:oklch(.94 .04 250)}
.example-nav a:nth-child(6n+3){background:oklch(.95 .045 80)}
.example-nav a:nth-child(6n+4){background:oklch(.94 .04 330)}
.example-nav a:nth-child(6n+5){background:oklch(.94 .04 205)}
.example-nav a:nth-child(6n){background:oklch(.95 .04 35)}
.example-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;align-items:stretch}
.example-card{margin:0;scroll-margin-top:100px;box-shadow:none}
.example-card b{font-size:16px;margin-bottom:13px}
.example-color-1{--example-accent:oklch(.49 .13 145);background:oklch(.97 .025 145);border-color:oklch(.85 .07 145);border-left-color:var(--example-accent)}
.example-color-1 b{color:var(--example-accent)}
.example-color-2{--example-accent:oklch(.49 .13 250);background:oklch(.97 .025 250);border-color:oklch(.85 .06 250);border-left-color:var(--example-accent)}
.example-color-2 b{color:var(--example-accent)}
.example-color-3{--example-accent:oklch(.5 .13 75);background:oklch(.98 .035 85);border-color:oklch(.87 .07 80);border-left-color:var(--example-accent)}
.example-color-3 b{color:var(--example-accent)}
.example-color-4{--example-accent:oklch(.5 .13 330);background:oklch(.97 .03 330);border-color:oklch(.86 .06 330);border-left-color:var(--example-accent)}
.example-color-4 b{color:var(--example-accent)}
.example-color-5{--example-accent:oklch(.48 .12 205);background:oklch(.97 .025 205);border-color:oklch(.85 .06 205);border-left-color:var(--example-accent)}
.example-color-5 b{color:var(--example-accent)}
.example-color-6{--example-accent:oklch(.5 .13 35);background:oklch(.98 .03 35);border-color:oklch(.87 .06 35);border-left-color:var(--example-accent)}
.example-color-6 b{color:var(--example-accent)}
@media(max-width:760px){.example-card-grid{grid-template-columns:1fr}.example-nav{position:relative;top:auto}.example-card{scroll-margin-top:20px}}

/* 提高公式区的字号、字重和前景背景对比 */
.formula{background:oklch(.93 .04 113);border-color:oklch(.72 .11 113);color:oklch(.16 .025 250);font-size:17px;font-weight:600;line-height:2;box-shadow:inset 0 0 0 1px color-mix(in oklab,var(--olive),transparent 88%)}
.formula strong{color:oklch(.29 .12 113);font-weight:800}
@media(max-width:680px){.formula{font-size:15px;line-height:1.95}}

/* 提升知识点提示的字号与对比度 */
.callout.tip{background:oklch(.94 .045 113);border-color:oklch(.72 .11 113);color:oklch(.16 .025 250);box-shadow:inset 0 0 0 1px color-mix(in oklab,var(--olive),transparent 88%)}
.callout.tip .callout-title{color:oklch(.29 .12 113);font-size:15px;font-weight:800}
.callout.tip p{font-size:16px;line-height:1.85;color:oklch(.18 .025 250)}
@media(max-width:680px){.callout.tip p{font-size:15px}}

/* 强化表格表头的层级与可读性 */
thead th,th{background:oklch(.92 .035 113);color:oklch(.19 .03 250);font-size:13px;font-weight:800;letter-spacing:.015em;border-bottom:2px solid oklch(.66 .1 113)}
thead th:first-child{border-top-left-radius:7px}
thead th:last-child{border-top-right-radius:7px}

/* 提高表格正文的可读性 */
table{font-size:15px;line-height:1.75;color:oklch(.18 .025 250)}
td{padding:13px 14px;color:oklch(.2 .025 250);border-bottom-color:oklch(.88 .018 250)}
tbody tr:nth-child(even){background:color-mix(in oklab,var(--surface),var(--olive-soft) 28%)}
@media(max-width:680px){table{font-size:14px}td{padding:11px 10px}}

/* 真题练习：筛选区、结果信息和题目列表分层呈现 */
.practice-content{width:min(100%,1180px)}
.practice-library{margin-top:34px}
.practice-toolbar{display:grid;grid-template-columns:minmax(240px,1.6fr) repeat(3,minmax(130px,.8fr)) auto;align-items:end;gap:14px;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:14px}
.practice-toolbar label,.practice-search{display:grid;gap:6px;color:var(--ink);font-size:13px;font-weight:700}
.practice-toolbar input,.practice-toolbar select{width:100%;min-height:44px;padding:9px 11px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--ink)}
.practice-toolbar input::placeholder{color:var(--muted)}
.practice-reset{min-height:44px;padding:9px 14px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-weight:700;cursor:pointer}
.practice-reset:hover{background:var(--olive-soft);border-color:var(--olive)}
.practice-summary{display:grid;grid-template-columns:1fr minmax(180px,260px);align-items:center;gap:0 20px;margin:25px 2px 12px}
.practice-summary>p{margin:0;font-size:14px;font-weight:800;color:var(--ink)}
.practice-summary .progress-track{grid-column:2;grid-row:1;margin:0}
.practice-summary .progress-caption{grid-column:2;text-align:right;margin-top:5px}
.practice-list{border-top:1px solid var(--line)}
.practice-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center;padding:21px 8px;border-bottom:1px solid var(--line)}
.practice-row[role="link"]{cursor:pointer}
.practice-row[role="link"]:hover{background:oklch(.985 0 0)}
.practice-row[role="link"]:focus-visible{outline:2px solid var(--ink);outline-offset:-2px}
.practice-row[hidden]{display:none}
.practice-meta{display:flex;flex-wrap:wrap;align-items:center;gap:7px;color:var(--muted);font-size:12px}
.practice-meta span{display:inline-flex;align-items:center;min-height:25px;padding:3px 9px;border-radius:999px;background:var(--surface);border:1px solid var(--line)}
.practice-meta .practice-kind{background:var(--olive-soft);border-color:color-mix(in oklab,var(--olive),white 78%);color:oklch(.29 .12 113);font-weight:700}
.practice-row h3{margin:9px 0 3px;font-size:18px;letter-spacing:-.02em}
.practice-row p{margin:0;color:var(--muted);font-size:14px;line-height:1.7}
.practice-actions{display:flex;align-items:center;gap:22px;white-space:nowrap}
.practice-actions a{font-size:13px;font-weight:800}
.practice-actions label{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--ink);cursor:pointer}
.practice-actions input{width:18px;height:18px;accent-color:var(--olive)}
.practice-row:has(input:checked) h3{text-decoration:line-through;text-decoration-color:var(--muted);color:var(--muted)}
.practice-empty{margin:0;padding:35px 15px;text-align:center;color:var(--muted)}
.practice-note{margin:14px 2px 0;font-size:12px;color:var(--muted)}
.practice-reset:focus-visible,.practice-toolbar input:focus-visible,.practice-toolbar select:focus-visible{outline:3px solid var(--blue);outline-offset:2px}

/* 放宽不同内容组之间的呼吸空间，保持阅读节奏 */
.content{width:min(100%,1160px);padding-top:48px}
.section{margin-top:46px}
.grid{gap:17px}
.panel{border-radius:13px;padding:22px 23px}
@media(max-width:900px){.content{padding-top:38px}}
@media(max-width:760px){.practice-toolbar{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.practice-search{grid-column:1/-1}.practice-reset{grid-column:1/-1}}
@media(max-width:680px){.content{padding:30px 18px 55px}.section{margin-top:34px}.panel{padding:17px}.practice-library{margin-top:24px}.practice-toolbar{grid-template-columns:1fr;padding:15px}.practice-search,.practice-reset{grid-column:auto}.practice-summary{grid-template-columns:1fr;gap:8px;margin-top:20px}.practice-summary .progress-track{grid-column:1;grid-row:2}.practice-summary .progress-caption{grid-column:1;grid-row:3;text-align:left}.practice-row{grid-template-columns:1fr;gap:12px;padding:18px 2px}.practice-row h3{font-size:17px}.practice-actions{justify-content:space-between}}

/* 错题复盘记录与总览建议 */
.practice-toolbar{grid-template-columns:minmax(200px,1.4fr) repeat(4,minmax(105px,.8fr)) auto;gap:12px}
.mistake-details{grid-column:1/-1;border-top:1px dashed var(--line);padding-top:10px}
.mistake-details summary{width:max-content;min-height:36px;display:flex;align-items:center;color:var(--blue);font-size:13px;font-weight:700;cursor:pointer}
.mistake-fields{display:grid;grid-template-columns:minmax(180px,1fr) minmax(160px,.8fr) minmax(260px,2fr) auto;align-items:end;gap:12px;padding:10px 0 2px}
.mistake-fields label{display:grid;gap:5px;color:var(--ink);font-size:12px;font-weight:700}
.mistake-fields select,.mistake-fields input,.mistake-fields textarea{width:100%;min-height:40px;padding:8px 10px;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--ink);font:inherit}
.mistake-fields textarea{min-height:58px;resize:vertical}
.mistake-fields button{min-height:40px;padding:7px 10px;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--muted);font-size:12px;cursor:pointer}
.mistake-fields button:hover{color:var(--ink);border-color:var(--olive)}
.practice-completion{grid-column:1/-1;margin:7px 0 0;text-align:right;font-size:12px;color:var(--muted)}
.study-dashboard-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:17px}
.next-action-panel,.topic-progress-panel{padding:23px 24px;background:var(--surface);border:1px solid var(--line);border-radius:13px}
.next-action-panel{background:oklch(.96 .025 113)}
.next-action-panel h3,.topic-progress-panel h3{margin:7px 0 8px;font-size:18px}
.next-action-panel p{margin:0 0 14px;color:oklch(.25 .025 250);font-size:14px;line-height:1.7}
.next-label{color:oklch(.29 .12 113);font-size:12px;font-weight:800}
.next-link{display:inline-flex;align-items:center;min-height:40px;padding:8px 13px;border-radius:8px;background:var(--olive);color:white;font-size:13px;font-weight:800;text-decoration:none}
.next-link:hover{filter:brightness(.94);text-decoration:none}
.topic-progress-panel h3{margin-top:0}
.topic-progress-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:7px 14px;padding:11px 0;border-bottom:1px solid var(--line);color:var(--ink);font-size:13px;font-weight:700;text-decoration:none}
.topic-progress-row:last-child{border-bottom:0}
.topic-progress-row:hover>span:first-child{color:var(--blue);text-decoration:underline}
.topic-progress-state{color:var(--muted);font-size:12px;font-weight:500}
.topic-progress-track{grid-column:1/-1;height:5px;border-radius:9px;background:var(--line);overflow:hidden}
.topic-progress-track i{display:block;height:100%;border-radius:inherit;background:var(--olive)}
.topic-progress-panel>.progress-caption{margin:8px 0 0;line-height:1.5}
@media(max-width:1000px){.practice-toolbar{grid-template-columns:repeat(3,minmax(0,1fr))}.practice-search{grid-column:span 2}.practice-reset{grid-column:auto}.mistake-fields{grid-template-columns:repeat(2,minmax(0,1fr))}.mistake-note-label{grid-column:1/-1}}
@media(max-width:760px){.practice-toolbar{grid-template-columns:repeat(2,minmax(0,1fr))}.practice-search,.practice-reset{grid-column:1/-1}.study-dashboard-grid{grid-template-columns:1fr}}
@media(max-width:680px){.practice-toolbar{grid-template-columns:1fr}.practice-search,.practice-reset{grid-column:auto}.mistake-fields{grid-template-columns:1fr}.mistake-note-label{grid-column:auto}.practice-completion{text-align:left}.next-action-panel,.topic-progress-panel{padding:18px}}

/* 真题练习分页 */
.practice-pagination{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin:18px 0 10px;padding:14px 0;border-top:1px solid var(--line)}
.page-range{color:var(--muted);font-size:14px;font-weight:700}
.page-controls{display:flex;align-items:center;flex-wrap:wrap;gap:6px}
.page-button{min-width:40px;min-height:40px;padding:7px 11px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-weight:700;cursor:pointer}
.page-button:hover:not(:disabled):not(.is-current){background:var(--olive-soft);border-color:var(--olive)}
.page-button.is-current{background:var(--olive);border-color:var(--olive);color:#fff}
.page-button:disabled{color:var(--muted);opacity:.55;cursor:not-allowed}
.page-button:focus-visible,.page-size-label select:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.page-ellipsis{padding:0 3px;color:var(--muted)}
.page-size-label{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:13px;font-weight:700}
.page-size-label select{min-height:40px;padding:6px 30px 6px 10px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font:inherit}
@media(max-width:680px){.practice-pagination{align-items:flex-start;flex-direction:column}.page-controls{width:100%}.page-button{min-width:38px;padding-inline:8px}}

/* 显示当前练习筛选条件，并允许逐项清除 */
.active-filters[hidden]{display:none}
.active-filters:not([hidden]){display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:12px 2px 0}
.active-filters-label{margin-right:2px;color:var(--muted);font-size:13px;font-weight:700}
.filter-chip{min-height:40px;padding:5px 11px;border:1px solid color-mix(in oklab,var(--olive),white 70%);border-radius:999px;background:var(--olive-soft);color:var(--ink);font-size:13px;font-weight:700;cursor:pointer}
.filter-chip:hover{border-color:var(--olive);background:color-mix(in oklab,var(--olive-soft),var(--olive) 10%)}
.filter-chip:focus-visible{outline:3px solid var(--blue);outline-offset:2px}

/* 窄屏下避免原生表单控件的固有宽度撑开筛选网格 */
.practice-toolbar>*{min-width:0}
.practice-toolbar input,.practice-toolbar select{min-width:0;max-width:100%}
.practice-search input{box-sizing:border-box}
@media(max-width:560px){.topline{gap:8px;padding-inline:14px}.crumb{min-width:0;white-space:nowrap}.top-meta{display:none}}

.practice-content,.practice-library,.practice-toolbar{min-width:0;max-width:100%}
@media(max-width:680px){.practice-toolbar{width:100%;grid-template-columns:minmax(0,1fr)}.practice-toolbar>*{width:100%;min-width:0}.practice-toolbar input,.practice-toolbar select{width:100%;min-width:0;max-width:100%}}
@media(max-width:480px){.top-meta{display:none}}

/* Monochrome editorial theme */
:root{
  color-scheme:light;
  --bg:oklch(.975 0 0);
  --surface:oklch(1 0 0);
  --ink:oklch(.13 0 0);
  --muted:oklch(.4 0 0);
  --olive:oklch(.16 0 0);
  --olive-soft:oklch(.95 0 0);
  --blue:oklch(.18 0 0);
  --amber:oklch(.32 0 0);
  --line:oklch(.86 0 0);
}
body{background:var(--bg);color:var(--ink)}
a{color:var(--ink)}
a:hover{text-decoration-thickness:2px}
button:focus-visible,a:focus-visible,input:focus-visible{outline-color:var(--ink)}
.rail{background:var(--surface);border-right-color:var(--line)}
.brand-mark{background:var(--ink);border-radius:8px}
.nav a[aria-current=page]{background:var(--ink);color:white}
.topline{background:var(--bg)}
.eyebrow{color:var(--ink)}
.eyebrow:before{background:var(--ink)}
.panel{border-radius:9px}
.panel-link:hover{border-color:var(--ink);transform:translateY(-1px)}
.stars{color:var(--ink)}
.formula{background:oklch(.96 0 0);border-color:var(--line);color:var(--ink);box-shadow:none}
.formula strong{color:var(--ink)}
.callout.tip{background:oklch(.96 0 0);border-color:var(--line);color:var(--ink);box-shadow:none}
.callout.tip .callout-title,.callout.tip p{color:var(--ink)}
.callout.warn{background:oklch(.96 0 0);border-color:var(--line);color:var(--ink)}
.list li::marker{color:var(--ink)}
.tag{background:oklch(.93 0 0);color:var(--ink)}
.check-row input,.practice-actions input{accent-color:var(--ink)}
.step:before{background:oklch(.93 0 0);color:var(--ink)}
.worked-example{background:var(--surface);border:1px solid var(--line);border-left:1px solid var(--line);border-radius:9px;box-shadow:0 8px 24px oklch(0 0 0 / .035)}
.worked-example .answer{border-top-color:var(--line)}
.example-nav{background:color-mix(in oklab,var(--surface),transparent 4%);border-color:var(--line);border-radius:9px}
.example-nav a,.example-nav a:nth-child(n){background:oklch(.95 0 0);color:var(--ink)}
.example-nav a:hover{background:oklch(.9 0 0);filter:none}
.example-color-1,.example-color-2,.example-color-3,.example-color-4,.example-color-5,.example-color-6{--example-accent:var(--ink);background:var(--surface);border-color:var(--line);border-left-color:var(--line)}
.example-color-1 b,.example-color-2 b,.example-color-3 b,.example-color-4 b,.example-color-5 b,.example-color-6 b{color:var(--ink)}
thead th,th{background:oklch(.16 0 0);color:white;border-bottom:1px solid var(--ink)}
td{color:var(--ink);border-bottom-color:var(--line)}
tbody tr:nth-child(even){background:oklch(.97 0 0)}
.practice-meta .practice-kind{background:oklch(.93 0 0);border-color:var(--line);color:var(--ink)}
.practice-actions a,.mistake-details summary{color:var(--ink)}
.next-action-panel{background:oklch(.95 0 0)}
.next-action-panel p,.next-label{color:var(--ink)}
.next-link{background:var(--ink);color:white}
.next-link:hover{filter:brightness(1.2)}
.topic-progress-row:hover>span:first-child{color:var(--ink)}
.topic-progress-track i,.progress-fill{background:var(--ink)}
.page-button:hover:not(:disabled):not(.is-current){background:oklch(.95 0 0);border-color:var(--ink)}
.page-button.is-current{background:var(--ink);border-color:var(--ink);color:white}
.filter-chip{border-color:var(--line);background:oklch(.95 0 0);color:var(--ink)}
.filter-chip:hover{border-color:var(--ink);background:oklch(.91 0 0)}
.practice-toolbar input:focus-visible,.practice-toolbar select:focus-visible,.practice-reset:focus-visible,.page-button:focus-visible,.page-size-label select:focus-visible,.filter-chip:focus-visible{outline-color:var(--ink)}
.practice-toolbar input,.practice-toolbar select,.mistake-fields select,.mistake-fields input,.mistake-fields textarea{background:var(--surface)}
::selection{background:var(--ink);color:white}

/* Individual past-paper question and answer view */
.question-detail-content{max-width:1100px}
.back-to-practice{display:inline-flex;margin-bottom:20px;color:var(--muted);font-size:13px;font-weight:700;text-decoration:none}
.back-to-practice:hover{color:var(--ink);text-decoration:underline}
.question-paper-section,.question-answer-section{margin-top:38px}
.question-paper-section .section-title{align-items:center}
.question-paper-section .section-title a,.answer-preview .section-title a{font-size:13px;font-weight:700;white-space:nowrap}
.pdf-page-wrap{overflow:hidden;border:1px solid var(--line);border-radius:9px;background:white}
.pdf-page-image{display:block;width:100%;height:auto;background:white}
.pdf-page-frame{display:block;width:100%;height:min(82vh,1120px);min-height:620px;border:0;background:white}
.pdf-caption{margin:8px 2px 0;color:var(--muted);font-size:12px}
.question-answer-section>h2{font-size:21px}
.answer-details{margin-top:14px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.answer-details summary{display:flex;align-items:center;min-height:64px;padding:12px 3px;color:var(--ink);font-size:16px;font-weight:800;cursor:pointer;list-style:none}
.answer-details summary::-webkit-details-marker{display:none}
.answer-details summary::after{content:"＋";margin-left:auto;font:18px var(--mono)}
.answer-details[open] summary::after{content:"−"}
.answer-preview{padding:2px 0 20px}
.answer-preview .section-title{align-items:center;margin:8px 2px 14px}
.answer-preview .section-title h3{margin:0;font-size:18px}
.question-detail-content .page-footer{margin-top:40px}
.practice-meta .question-detail-link{display:inline-flex;align-items:center;justify-content:center;min-height:25px;padding:3px 9px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink)!important;font-size:12px!important;font-weight:700;text-decoration:none;transition:background .16s ease,border-color .16s ease}
.practice-meta .question-detail-link:hover{border-color:var(--ink);background:oklch(.95 0 0);text-decoration:none}
.knowledge-intro{max-width:76ch;margin:0 0 13px;color:var(--muted);font-size:14px}
.topic-layout{display:grid;grid-template-columns:minmax(0,1fr) 212px;align-items:stretch;gap:24px}
.topic-sections{min-width:0}
.knowledge-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch;gap:13px}
.knowledge-card{min-width:0;padding:18px 19px;background:var(--surface);border:1px solid var(--line);border-radius:9px}
.knowledge-card h3{margin:0 0 10px;font-size:17px;letter-spacing:-.02em}
.knowledge-card-detail{padding:10px 0 0;border-top:1px solid var(--line)}
.knowledge-card-detail+.knowledge-card-detail{margin-top:10px}
.knowledge-card-label{display:block;margin-bottom:4px;color:var(--muted);font-size:12px;font-weight:800}
.knowledge-card-detail p{margin:0;color:var(--ink);font-size:14px;line-height:1.75;text-wrap:pretty}
.topic-sidebar{position:sticky;top:18px;align-self:start;max-height:calc(100vh - 36px);overflow-y:auto;padding:16px;background:var(--surface);border:1px solid var(--line);border-radius:9px}
.topic-sidebar-title{margin:0 0 10px;font-size:14px;font-weight:800;color:var(--ink)}
.topic-sidebar-links{display:grid;gap:3px}
.topic-sidebar-links a{display:block;padding:6px 8px;border-radius:5px;color:var(--muted);font-size:12px;line-height:1.55;text-decoration:none}
.topic-sidebar-links a:hover,.topic-sidebar-links a:focus-visible{background:var(--bg);color:var(--ink)}
.knowledge-card[id],#examples,#practice{scroll-margin-top:20px}
@media(max-width:1100px){.topic-layout{grid-template-columns:1fr}.topic-sidebar{position:static;grid-row:1;max-height:none;padding:12px 14px}.topic-sections{grid-row:2}.topic-sidebar-links{display:flex;align-items:center;gap:4px;overflow-x:auto;scrollbar-width:thin;white-space:nowrap}.topic-sidebar-links a{flex:none;border:1px solid var(--line);padding:5px 9px}}
@media(max-width:860px){.knowledge-cards{grid-template-columns:1fr}}
@media(max-width:680px){.knowledge-cards{grid-template-columns:1fr}.knowledge-card{padding:16px}}
@media(max-width:760px){.question-paper-section .section-title{align-items:flex-start;flex-direction:column;gap:6px}.answer-preview .section-title{align-items:flex-start;flex-direction:column;gap:7px}}
@media(max-width:680px){.question-detail-content{padding-inline:18px}.question-paper-section,.question-answer-section{margin-top:30px}.question-detail-content .page-footer{align-items:flex-start;flex-direction:column}}
.exercise-item[role="link"]{cursor:pointer;border-radius:5px}
.exercise-item[role="link"]:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
/* 第一阶段：考试核心页 */
.core-content{max-width:1180px}.core-lede{background:oklch(.97 0 0)}.core-lede p{max-width:65ch;margin:0;color:var(--ink);font-size:16px}.core-lede-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:22px}.core-lede-actions a:not(.next-link){font-weight:700;font-size:13px}.core-sample{display:flex;flex-direction:column}.core-facts{margin:20px 0 0;border-top:1px solid var(--line)}.core-facts div{display:flex;align-items:baseline;justify-content:space-between;padding:10px 0;border-bottom:1px solid var(--line)}.core-facts div:last-child{border-bottom:0}.core-facts dt{color:var(--muted);font-size:13px}.core-facts dd{margin:0;font-weight:800;font-family:var(--mono);font-size:15px}.coverage-panel{padding:8px 22px 18px}.coverage-list{display:grid}.coverage-row{display:grid;grid-template-columns:minmax(190px,1.25fr) minmax(180px,1fr) auto;align-items:center;gap:18px;padding:15px 0;border-bottom:1px solid var(--line)}.coverage-row:last-child{border-bottom:0}.coverage-row.is-core .coverage-label strong{font-weight:800}.coverage-label{display:grid;gap:2px}.coverage-label strong{font-size:14px}.coverage-label span{font-size:12px;color:var(--muted)}.coverage-meter{display:grid;grid-template-columns:minmax(80px,1fr) auto;align-items:center;gap:10px}.coverage-meter>span{font:12px var(--mono);color:var(--muted);white-space:nowrap}.coverage-track{height:7px;background:var(--line);border-radius:99px;overflow:hidden}.coverage-track i{display:block;height:100%;background:var(--ink);border-radius:inherit}.coverage-row a{font-size:12px;font-weight:800;white-space:nowrap}.core-footnote{margin:17px 0 0;font-size:12px}.section-title.span-12{display:flex;grid-column:span 12}.ability-card{position:relative;padding-top:48px}.ability-index{position:absolute;top:18px;right:20px;font:12px var(--mono);font-weight:800;color:var(--muted)}.ability-card h3{margin:0 0 7px}.ability-card p{margin:0 0 14px;color:var(--muted);font-size:14px}.ability-card a{font-size:12px;font-weight:800}.route-strip{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--ink);border-bottom:1px solid var(--ink)}.route-strip a{display:grid;gap:3px;min-height:118px;padding:16px 17px;color:var(--ink);text-decoration:none;border-right:1px solid var(--line);transition:background .18s ease}.route-strip a:last-child{border-right:0}.route-strip a:hover{background:var(--surface)}.route-strip b{font:12px var(--mono);color:var(--muted)}.route-strip span{font-weight:800;font-size:15px}.route-strip small{color:var(--muted);font-size:12px}.callout.tip a{font-weight:800}.core-content .callout{margin-top:46px}
@media(max-width:900px){.coverage-row{grid-template-columns:minmax(180px,1.1fr) minmax(150px,1fr) auto}.route-strip{grid-template-columns:repeat(3,1fr)}.route-strip a:nth-child(3){border-right:0}.route-strip a:nth-child(-n+3){border-bottom:1px solid var(--line)}}
@media(max-width:680px){.core-lede p{font-size:15px}.core-lede-actions{align-items:flex-start;flex-direction:column;gap:12px}.coverage-panel{padding-inline:16px}.coverage-row{grid-template-columns:1fr;gap:8px;padding:14px 0}.coverage-row a{justify-self:start}.coverage-meter{grid-template-columns:minmax(0,1fr) auto}.section-title.span-12{grid-column:span 12}.route-strip{grid-template-columns:1fr}.route-strip a,.route-strip a:nth-child(3){border-right:0;border-bottom:1px solid var(--line);min-height:0}.route-strip a:last-child{border-bottom:0}.core-content .callout{margin-top:34px}}
/* 首页考试核心入口 */
.core-home-panel{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:24px;background:oklch(.97 0 0)}.core-home-panel h3{margin:9px 0 5px}.core-home-panel p{max-width:66ch;margin:0;color:var(--muted);font-size:14px}.core-home-stats{display:grid;grid-template-columns:auto auto;align-items:baseline;gap:0 8px;min-width:142px;padding-left:22px;border-left:1px solid var(--line)}.core-home-stats strong{font:800 25px/1 var(--mono)}.core-home-stats span{color:var(--muted);font-size:12px}.core-home-panel .next-link{white-space:nowrap}
@media(max-width:760px){.core-home-panel{grid-template-columns:1fr;gap:16px}.core-home-stats{padding:14px 0 0;border-left:0;border-top:1px solid var(--line);min-width:0}.core-home-panel .next-link{justify-self:start}}
/* 第二阶段：复习路线与试卷分析 */
.route-content,.paper-content{max-width:1180px}.route-selector{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.route-plan{display:flex;flex-direction:column;padding:23px 24px;background:var(--surface);border:1px solid var(--line);border-radius:13px}.route-plan-primary{background:oklch(.97 0 0);border-color:var(--ink)}.route-plan-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.route-duration{font-size:11px;color:var(--muted);white-space:nowrap}.route-plan h2{font-size:23px;margin:17px 0 7px}.route-plan>p{margin:0;color:var(--muted);font-size:14px;min-height:48px}.route-steps{list-style:none;padding:0;margin:20px 0 22px;border-top:1px solid var(--line)}.route-steps li{border-bottom:1px solid var(--line)}.route-steps a{display:grid;gap:1px;padding:11px 0;color:var(--ink);text-decoration:none}.route-steps a:hover b{text-decoration:underline;text-underline-offset:3px}.route-steps b{font-size:14px}.route-steps span{font-size:12px;color:var(--muted)}.route-plan .next-link,.route-plan .text-link{margin-top:auto;align-self:flex-start}.text-link{font-size:13px;font-weight:800;color:var(--ink);text-decoration:underline;text-underline-offset:3px}.route-checklist{margin-top:4px}.route-checklist li{padding:6px 0}.route-checklist b{color:var(--ink)}.paper-guidance .panel{min-height:180px}.paper-guidance h3{font-size:21px;margin:13px 0 7px}.paper-guidance p{min-height:56px;margin:0 0 15px;color:var(--muted);font-size:14px}.paper-guidance a{font-size:13px;font-weight:800}.paper-table-wrap{overflow-x:auto;padding:0}.paper-table{min-width:760px}.paper-table th,.paper-table td{padding:14px 15px}.paper-table tbody tr:hover{background:oklch(.97 0 0)}.paper-table td:first-child{width:145px}.paper-table td:nth-child(2){min-width:260px}.paper-table td:nth-child(3){min-width:210px}.paper-table a{font-size:12px;font-weight:800;white-space:nowrap}
@media(max-width:1000px){.route-selector{grid-template-columns:1fr}.route-plan>p{min-height:0}.route-plan h2{font-size:22px}.route-steps{margin-bottom:18px}}
@media(max-width:680px){.route-plan{padding:18px}.route-plan-head{align-items:flex-start;flex-direction:column;gap:7px}.route-duration{white-space:normal}.paper-guidance .panel{min-height:0}.paper-table-wrap{margin-inline:-1px}.paper-table th,.paper-table td{padding:11px 12px}}
/* 导航栏分组 */
.nav-group{display:grid;gap:3px}.nav-group+.nav-group{margin-top:14px}.nav-group-label{padding:0 10px 3px;color:var(--muted);font-size:11px;font-weight:800;letter-spacing:.06em}.nav-grouped{gap:0}.nav-grouped a{font-size:13px}.system-tree{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.system-node{display:grid;grid-template-columns:38px 1fr;gap:14px;padding:19px 20px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.node-index{font:800 13px var(--mono);color:var(--muted);padding-top:2px}.system-node h3{margin:0 0 4px;font-size:17px}.system-node p{margin:0 0 5px;font-size:14px}.system-node small{color:var(--muted);font-size:12px}.topic-role{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:15px;background:oklch(.97 0 0)}.topic-role p{margin:0;font-size:14px}.topic-role a{font-size:12px;font-weight:800;white-space:nowrap}.method-flow{display:grid;gap:0;padding:0;margin:0;list-style:none}.method-flow li{display:grid;grid-template-columns:29px 1fr;align-items:center;gap:11px;padding:11px 0;border-bottom:1px solid var(--line);font-size:14px}.method-flow li:last-child{border-bottom:0}.method-flow b{display:grid;place-items:center;width:27px;height:27px;border-radius:50%;background:var(--olive-soft);font:12px var(--mono)}.mapping-copy{min-height:106px;margin:0 0 18px;color:var(--muted);font-size:14px}.topic-task-panel{background:var(--surface)}.task-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0 20px}.task-list li{border-bottom:1px solid var(--line)}.task-list .check-row{border-bottom:0}.task-list+.progress-track{margin-top:14px}
@media(max-width:860px){.system-tree{grid-template-columns:1fr}.topic-role{grid-template-columns:auto 1fr}.topic-role a{grid-column:2}.task-list{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:680px){.nav-group+.nav-group{margin-top:10px}.nav-group-label{padding-inline:6px}.system-node{padding:16px}.topic-role{grid-template-columns:1fr}.topic-role a{grid-column:auto}.topic-role p{font-size:14px}.task-list{grid-template-columns:1fr}.mapping-copy{min-height:0}}
/* 专题知识速查页 */
.topic-reference-content{max-width:1180px}.reference-callout{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:15px;padding:16px 19px;background:oklch(.97 0 0);border:1px solid var(--line);border-radius:12px}.reference-callout p{margin:0;font-size:14px}.knowledge-group{margin-top:42px}.knowledge-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.knowledge-card{position:relative;padding:20px 20px 18px}.knowledge-number{display:block;margin-bottom:8px;font:11px var(--mono);color:var(--muted)}.knowledge-card h3{margin:0 0 12px;font-size:18px}.knowledge-card p{margin:8px 0 0;font-size:13px;line-height:1.72}.knowledge-card p b{font-weight:800}.knowledge-trap{padding-top:9px;border-top:1px solid var(--line)}.knowledge-trap b{color:var(--ink)}.reference-check{padding:20px 22px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.check-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 26px;margin-bottom:0}.check-list li{padding:7px 0}.check-list li::marker{color:var(--ink)}
@media(max-width:1000px){.knowledge-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:680px){.reference-callout{grid-template-columns:1fr;gap:9px}.knowledge-group{margin-top:34px}.knowledge-grid{grid-template-columns:1fr}.reference-check{padding:17px}.check-list{grid-template-columns:1fr}}
/* 导航滚动修正 */
.rail{overflow:hidden}.nav-grouped{min-height:0;overflow-y:auto;overflow-x:hidden;padding-right:4px;scrollbar-width:thin}.nav-grouped::-webkit-scrollbar{width:7px}.nav-grouped::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px}.nav-grouped::-webkit-scrollbar-thumb:hover{background:var(--muted)}
@media(max-width:680px){.rail{overflow:visible}.nav-grouped{display:flex;align-items:flex-start;gap:12px;overflow-x:auto;overflow-y:hidden;padding:0 0 4px;scrollbar-width:thin}.nav-group{display:flex;align-items:center;gap:4px;flex:none;margin:0!important}.nav-group-label{display:none}.nav-grouped a{flex:none}.nav-grouped::-webkit-scrollbar{height:6px}.nav-grouped::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px}}
/* 知识点详情页与专题内链 */
.knowledge-link{color:var(--ink);text-decoration:underline;text-decoration-color:var(--line);text-underline-offset:4px}.knowledge-link:hover{text-decoration-color:var(--ink)}.knowledge-detail-content{max-width:900px}.detail-summary{display:grid;grid-template-columns:auto 1fr;align-items:start;gap:15px;padding:19px 21px;background:oklch(.97 0 0);border:1px solid var(--line);border-radius:12px}.detail-summary p{margin:0;font-size:16px;line-height:1.8}.detail-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin-top:24px}.detail-grid .panel{min-height:150px}.detail-grid h2,.formula-note h2,.trap-note h2{margin-top:0;font-size:20px}.detail-grid p,.trap-note p{margin:0;font-size:15px;line-height:1.8}.formula-note{background:var(--surface)}.formula-note .formula-note{margin:0}.trap-note{background:oklch(.97 0 0)}
@media(max-width:680px){.detail-summary{grid-template-columns:1fr;gap:9px}.detail-grid{grid-template-columns:1fr}.detail-summary p{font-size:15px}}
/* 深度知识点讲解 */
.detail-section{margin-top:34px}.detail-reading{padding:22px 24px}.detail-reading p{margin:0;font-size:15px;line-height:1.9}.detail-steps{display:grid;gap:9px;margin:0 0 17px;padding-left:1.35em}.detail-steps li{padding-left:4px;font-size:15px;line-height:1.8}.detail-steps li::marker{font-family:var(--mono);font-weight:800}.knowledge-detail-content .trap-note{background:oklch(.97 0 0)}
/* 专业三基详解页 */
.deep-content{max-width:920px}.deep-section{margin-top:42px}.deep-reading{padding:24px 26px}.deep-reading p,.deep-reading li{font-size:15px;line-height:1.95}.math-block{margin:18px 0;padding:16px 20px;background:oklch(.95 0 0);border:1px solid var(--line);font:16px/1.9 var(--mono);text-align:center;overflow-x:auto}.math-inline{font-family:var(--mono)}.deep-steps{display:grid;gap:12px;padding-left:1.4em}.deep-steps li{padding-left:5px}.concept-figure{margin:24px 0 4px;padding:14px 15px;border:1px solid var(--line);background:var(--bg);border-radius:10px}.concept-figure svg{display:block;width:100%;height:auto}.concept-figure figcaption{margin-top:8px;text-align:center;color:var(--muted);font-size:12px}.svg-axis{stroke:oklch(.65 0 0);stroke-width:1}.svg-line{fill:none;stroke:oklch(.2 0 0);stroke-width:3}.svg-curve{fill:none;stroke:oklch(.45 0 0);stroke-width:3}.svg-dot{fill:oklch(.16 0 0)}.svg-label,.svg-caption{font:14px system-ui,sans-serif;fill:oklch(.2 0 0)}.svg-caption{font-size:12px;fill:oklch(.4 0 0)}
/* 公式速查示范模块 */
.formula-reference-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px}.formula-reference-card{padding:19px 20px;background:var(--surface);border:1px solid var(--line);border-radius:11px}.formula-reference-card h3{margin:0 0 10px;font-size:17px}.formula-reference-card .math-block{margin:12px 0;font-size:14px;line-height:1.85;padding:13px 14px}.formula-reference-card p{margin:9px 0 0;font-size:13px;line-height:1.75}.formula-reference-card p b{font-weight:800}.formula-reference-demo .callout{margin-bottom:0}
@media(max-width:900px){.formula-reference-grid{grid-template-columns:1fr 1fr}.formula-reference-card:last-child{grid-column:1/-1}}
@media(max-width:680px){.formula-reference-grid{grid-template-columns:1fr}.formula-reference-card:last-child{grid-column:auto}}
/* 右侧常驻公式速查 */
@media(min-width:1001px){.deep-content{display:grid;grid-template-columns:minmax(0,1fr) 330px;column-gap:28px;align-items:start}.deep-content>.page-head{grid-column:1/-1}.deep-content>.deep-section:not(.formula-reference-demo){grid-column:1}.deep-content>.formula-reference-demo{grid-column:2;grid-row:2 / span 6;position:sticky;top:22px;align-self:start;margin-top:0}.deep-content>.page-footer{grid-column:1/-1}.formula-reference-grid{grid-template-columns:1fr}.formula-reference-card{padding:15px 16px}.formula-reference-card h3{font-size:16px}.formula-reference-card .math-block{font-size:13px;padding:11px 12px}.formula-reference-card p{font-size:12px;line-height:1.65}.formula-reference-demo .section-title{display:block}.formula-reference-demo .section-note{display:block;margin-top:4px}}
@media(max-width:1000px){.deep-content{display:block}.formula-reference-demo{position:static}}
/* 右侧公式栏尺寸与位置微调 */
@media(min-width:1001px){.deep-content{max-width:1180px;grid-template-columns:minmax(0,1fr) 270px;column-gap:34px}.deep-content>.formula-reference-demo{justify-self:end;width:270px}.formula-reference-card{padding:12px 13px}.formula-reference-card h3{font-size:15px;margin-bottom:7px}.formula-reference-card .math-block{font-size:12px;line-height:1.7;padding:9px 10px;margin:8px 0}.formula-reference-card p{font-size:11px;line-height:1.55;margin-top:6px}.formula-reference-demo .section-title h2{font-size:19px}.formula-reference-demo .callout{padding:11px 12px}.formula-reference-demo .callout p{font-size:11px;line-height:1.55}}
/* 右侧公式栏独立滚动 */
@media(min-width:1001px){.deep-content>.formula-reference-demo{max-height:calc(100vh - 44px);overflow-y:auto;scrollbar-width:thin;padding-right:6px}.deep-content>.formula-reference-demo::-webkit-scrollbar{width:6px}.deep-content>.formula-reference-demo::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px}.deep-content>.formula-reference-demo::-webkit-scrollbar-thumb:hover{background:var(--muted)}}
/* 详情页左上角返回专题 */
.detail-back-link{display:inline-flex;align-items:center;margin:0 0 18px;color:var(--ink);font-size:13px;font-weight:800;text-decoration:none}.detail-back-link:hover{text-decoration:underline;text-underline-offset:4px}
/* 修复返回链接撑高正文布局 */
.deep-content{position:relative}.deep-content>.detail-back-link{position:absolute;top:0;left:0;z-index:1;margin:0}.deep-content>.detail-back-link+.page-head{padding-top:30px}
@media(max-width:680px){.deep-content>.detail-back-link{position:relative;top:auto;left:auto;margin-bottom:12px}.deep-content>.detail-back-link+.page-head{padding-top:0}}
/* 隐藏公式栏滚动条，保留滚动能力 */
@media(min-width:1001px){.deep-content>.formula-reference-demo{scrollbar-width:none}.deep-content>.formula-reference-demo::-webkit-scrollbar{display:none;width:0;height:0}}

/* 公式速查与专题页共用同一套内容节奏与卡片语气。 */
.formula-reference-content{max-width:1180px}
.formula-reference-content .reference-callout{margin-bottom:2px}
.formula-reference-content .section{margin-top:42px}
.formula-reference-content .section-title h2{font-size:21px}
.formula-reference-content .section-title>a{font-size:12px;font-weight:800;white-space:nowrap}
.formula-reference-content .panel{padding:20px 21px}
.formula-reference-content .formula{margin:0 0 15px;padding:16px 18px;background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--olive);border-radius:9px;box-shadow:none;color:var(--ink);font-size:14px;line-height:1.9;font-weight:500}
.formula-reference-content .panel .muted{font-size:13px;line-height:1.72}
.formula-reference-content .example-section .panel{padding:20px 21px}
@media(max-width:680px){.formula-reference-content .section{margin-top:34px}.formula-reference-content .panel,.formula-reference-content .example-section .panel{padding:17px}.formula-reference-content .formula{font-size:14px;line-height:1.9;padding:14px 15px}}
/* 复杂知识点图文解释 */
.diagram-card{margin:26px 0 4px;padding:14px 15px;background:var(--bg);border:1px solid var(--line);border-radius:10px}.diagram-card svg{display:block;width:100%;height:auto}.svg-box{fill:var(--surface);stroke:var(--line);stroke-width:1.5}.svg-arrow{fill:none;stroke:var(--ink);stroke-width:1.5}.diagram-card .svg-label{font-size:13px}.diagram-card .svg-caption{font-size:12px;fill:var(--muted)}