@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap');
:root{--bg:#f5f4ef;--ink:#142133;--muted:#607085;--line:#dce2e7;--navy:#111d2d;--blue:#3369d6;--mint:#bbebd9;--paper:#fff;--orange:#e6a463}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans','Noto Sans SC',system-ui,sans-serif;line-height:1.65}button,input,select{font:inherit}button{cursor:pointer}a{color:inherit}a:hover{color:var(--blue)}.shell{max-width:1440px;margin:auto}.topbar{height:78px;padding:0 5%;display:flex;align-items:center;justify-content:space-between;background:var(--navy);color:white}.brand{text-decoration:none;font-weight:800;font-size:18px;letter-spacing:.02em;display:flex;align-items:center;gap:12px}.brand-mark{width:35px;height:35px;display:grid;place-items:center;background:#d5f5e9;color:#132333;border-radius:10px;font-size:20px}.brand-light{font-weight:500;color:#b7c5d2}.topnav{display:flex;gap:8px;align-items:center}.navbtn,.navlink{border:0;background:transparent;color:#bdc9d5;padding:10px 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h3{font-size:clamp(20px,2vw,27px);line-height:1.45;letter-spacing:-.025em;margin:0 0 25px}.prompt-code{background:#17263a;color:#d6edff;border-radius:10px;padding:16px;white-space:pre-wrap;overflow:auto;font-size:13px}.options{display:grid;gap:9px}.option{display:flex;align-items:flex-start;gap:11px;padding:13px 15px;border:1px solid #dce3eb;border-radius:10px;cursor:pointer;line-height:1.5}.option:hover{border-color:#9db7ee;background:#f7faff}.option input{margin-top:4px;accent-color:var(--blue)}.option.selected{border-color:#6692df;background:#eef5ff}.option.correct{border-color:#54af7f;background:#eaf8ef}.option.wrong{border-color:#e48a7d;background:#fff0ed}.option-key{font-weight:800;color:#64758a;min-width:17px}.q-help{font-size:12px;color:var(--muted);margin:16px 0}.check-btn,.primary-btn{border:0;border-radius:9px;background:#2f63cf;color:white;font-weight:800;padding:11px 18px}.check-btn:hover,.primary-btn:hover{background:#204fac}.secondary-btn{border:1px solid #cbd7e4;border-radius:9px;background:#fff;color:#3a516d;font-weight:800;padding:10px 18px}.secondary-btn:hover{background:#eef3f9}.feedback{padding:16px 18px;border-radius:10px;background:#f4f8fb;margin-top:20px;border-left:4px solid #6998dd}.feedback.good{border-color:#3da66d;background:#eef9f1}.feedback.bad{border-color:#df7f67;background:#fff4f0}.feedback-title{font-weight:800;margin-bottom:7px}.answer-text{white-space:pre-wrap;word-break:break-word;color:#38495d;font-size:14px;max-height:360px;overflow:auto}.source-line{font-size:12px;color:#728094;border-top:1px solid var(--line);margin-top:25px;padding-top:15px;display:flex;flex-wrap:wrap;gap:8px;align-items:center}.source-line a{font-weight:700;color:#315eba}.flash-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:13px}.deck-actions{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:14px}.deck-actions span{font-size:13px;color:#738296}.deck-actions 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@media(max-width:900px){.workspace{grid-template-columns:1fr}.sidebar{position:static}.bank-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.hero{padding-top:58px}.source-grid{grid-template-columns:1fr}}
@media(max-width:580px){.topbar{height:auto;min-height:68px;padding:12px 5%;gap:10px;align-items:flex-start}.brand-light,.navlink{display:none}.topnav{gap:2px}.navbtn{padding:8px 10px;font-size:12px}.hero{padding:54px 5% 49px}.hero-stats{gap:20px}.hero-stats div{min-width:90px}.hero-stats strong{font-size:26px}.hero-stats span{font-size:11px}.section-heading{align-items:start;flex-direction:column}.section-heading h2{font-size:27px}.sidebar{padding:18px}.bank-list{grid-template-columns:1fr 1fr}.bank-btn{padding:8px;font-size:11px}.question-card{padding:20px}.option{padding:11px}footer{flex-direction:column}}
.legal-page{max-width:900px;min-height:70vh;margin:auto}.legal-page h1{font-size:48px;line-height:1.2;margin:12px 0 22px}.legal-page>p{font-size:16px;color:#536477;margin-bottom:28px}.legal-block{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px 28px;margin:16px 0}.legal-block h2{font-size:22px;margin:0 0 10px}.legal-block p{margin:8px 0;color:#536477}.legal-block a{color:#315eba}
@media(max-width:580px){.topnav .nav-guide{display:inline-block;margin-left:0;padding:8px 10px;font-size:12px}}
.unverified{padding:10px 13px;background:#fff7e9;border:1px solid #efd7a9;border-radius:8px;color:#825b23;font-size:12px;margin:-9px 0 19px}.study-page{max-width:1040px;margin:auto}.study-head{margin-bottom:38px}.study-head h1{font-size:clamp(32px,4vw,49px);line-height:1.2;margin:10px 0 16px}.study-head p{color:#526477;font-size:16px;max-width:850px}.study-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:26px;align-items:start}.study-nav{position:sticky;top:18px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px}.study-nav strong{display:block;margin-bottom:9px}.study-nav a{display:block;color:#3f5875;text-decoration:none;font-size:13px;padding:7px 4px}.study-nav a:hover{color:#1b56b8}.study-section{background:#fff;border:1px solid var(--line);border-radius:16px;padding:32px;margin-bottom:20px}.study-section h2{font-size:27px;line-height:1.3;margin:0 0 16px}.study-section h3{font-size:19px;margin:26px 0 9px}.study-section p,.study-section li{color:#42556a;line-height:1.85}.study-section ul,.study-section ol{padding-left:23px}.study-section li{margin:6px 0}.study-section table{width:100%;border-collapse:collapse;font-size:14px;margin:14px 0}.study-section th,.study-section td{text-align:left;border:1px solid #dce3eb;padding:9px 11px;vertical-align:top}.study-section th{background:#edf4fa}.study-section code{background:#eef2f5;padding:2px 5px;border-radius:4px;word-break:break-word}.study-section pre{background:#142236;color:#e2eefb;padding:18px;border-radius:10px;overflow:auto;line-height:1.6;font-size:13px}.study-section pre code{background:transparent;color:inherit;padding:0}.example{background:#eef7f4;border-left:4px solid #7bbba1;padding:15px 18px;border-radius:0 9px 9px 0;margin:16px 0}.example p{margin:6px 0}.source-note{font-size:13px;color:#66788b;border-top:1px solid var(--line);padding-top:13px;margin-top:26px}.source-note a,.study-section a{color:#285cb7}.study-section .lead{font-weight:600;color:#26374b}.study-section .caution{background:#fff7e9;border-left:4px solid #e5b670;padding:13px 17px;border-radius:0 8px 8px 0}@media(max-width:800px){.study-layout{grid-template-columns:1fr}.study-nav{position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 10px}.study-nav strong{grid-column:1/-1}.study-section{padding:22px}.study-section table{font-size:12px}}
.study-example{background:#eef7f4;border-left:4px solid #7bbba1;padding:15px 18px;border-radius:0 9px 9px 0;margin:16px 0;color:#3b5263;line-height:1.8}.study-note{background:#fff7e9;border-left:4px solid #e5b670;padding:13px 17px;border-radius:0 8px 8px 0;margin:16px 0;color:#594a31;line-height:1.8}.study-source,.study-sources{font-size:13px;color:#66788b!important;border-top:1px solid var(--line);padding-top:13px;margin-top:26px}
.topnav a{text-decoration:none}.section-heading h1{font-size:32px;letter-spacing:-.04em;line-height:1.1;margin:0}#practice-view{min-height:70vh}
.tag.original{background:#e2f5eb;color:#1a7955}.study-section figure{border:1px solid #dce3eb;background:#f9fbfd;border-radius:12px;padding:16px;max-width:100%;overflow-x:auto}.study-section figure svg{height:auto}.study-section figcaption{font-size:12px;color:#617286;line-height:1.6;margin-top:10px}.study-section .study-table-wrap{max-width:100%;overflow-x:auto}.study-section .study-table{min-width:520px}
.chapter-layout>*{min-width:0}@media(max-width:850px){.chapter-layout{grid-template-columns:minmax(0,1fr)}}
.guide-landing{max-width:1050px;margin:auto;min-height:70vh}.guide-intro{margin:0 0 27px}.guide-intro h1{font-size:40px;line-height:1.2;margin:0 0 14px}.guide-intro p{color:#4d6075;max-width:800px;margin:6px 0}.chapter-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.chapter-card{display:flex;flex-direction:column;gap:9px;background:#fff;border:1px solid var(--line);border-radius:13px;padding:22px;text-decoration:none;min-height:148px}.chapter-card:hover{border-color:#7da8e2;box-shadow:0 7px 22px #19314f0d}.chapter-card strong{font-size:19px;color:#1e3046}.chapter-card span{font-size:13px;color:#5e7083;line-height:1.5}.chapter-card b{font-size:12px;color:#2f63cf;margin-top:auto}.guide-basis{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 23px;margin-top:24px;font-size:13px;color:#586b7d}.guide-basis strong{font-size:14px;color:#203249}.guide-basis p{margin:8px 0 0}.guide-basis a{color:#285cb7}.chapter-page{max-width:1180px;margin:auto}.chapter-layout{display:grid;grid-template-columns:225px minmax(0,1fr);gap:25px;align-items:start}.chapter-sidebar{position:sticky;top:18px;background:#fff;border:1px solid var(--line);border-radius:13px;padding:18px}.chapter-sidebar strong{display:block;font-size:13px;margin:12px 0 7px;color:#203249}.chapter-sidebar a{display:block;padding:9px 10px;color:#405774;text-decoration:none;font-size:13px;border-radius:7px}.chapter-sidebar a:hover,.chapter-sidebar a.active{background:#eaf2ff;color:#2456a5}.chapter-sidebar .back-to-guide{font-weight:700;color:#2e61b8}.chapter-path{font-size:12px;color:#718197;margin:0 0 12px}.chapter-main .study-section{margin-bottom:16px}.chapter-main .study-section h1{font-size:30px;line-height:1.3;margin:0 0 19px}.chapter-main .study-section h2{font-size:22px;margin:31px 0 11px}.chapter-pagination{display:flex;justify-content:space-between;gap:12px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px}.chapter-pagination a{color:#285cb7;text-decoration:none;font-weight:700;font-size:14px}.chapter-pagination a:hover{text-decoration:underline}@media(max-width:850px){.chapter-layout{grid-template-columns:1fr}.chapter-sidebar{position:static;display:flex;align-items:center;overflow-x:auto;gap:4px;white-space:nowrap;padding:10px}.chapter-sidebar strong{display:none}.chapter-sidebar a{flex:0 0 auto}.chapter-cards{grid-template-columns:1fr}.chapter-card{min-height:128px}.chapter-main .study-section h1{font-size:26px}}@media(max-width:580px){.guide-intro h1{font-size:32px}.chapter-main .study-section{padding:20px}.chapter-main .study-section h2{font-size:20px}}