:root{color-scheme:dark;--bg:#111722;--panel:#18212e;--panel2:#202b3b;--text:#f0f3f7;--muted:#a8b5c7;--line:#303d50;--accent:#faad55;--accent-soft:#352b20;--ink:#171d27;--green:#8bd6b2;--green-bg:#19382d;--red:#ffaaa7;--red-bg:#432a32;--reader:1.125rem}
:root[data-theme=light]{color-scheme:light;--bg:#f4f6f9;--panel:#fff;--panel2:#eaf0f6;--text:#182334;--muted:#4e627b;--line:#cbd5e1;--accent:#a45000;--accent-soft:#fff0de;--ink:#fff;--green:#17603d;--green-bg:#e4f4eb;--red:#a12f35;--red-bg:#fde9ea}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:1rem/1.6 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}html{scroll-behavior:smooth;scroll-padding-top:95px}button,input,select{font:inherit}button,a,summary{-webkit-tap-highlight-color:transparent}button,summary{cursor:pointer}a{color:var(--accent);text-underline-offset:4px}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button{color:inherit}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3,h4{line-height:1.25}h1{font-size:clamp(2rem,3.5vw,3.1rem);letter-spacing:-.045em;margin-bottom:14px}h2{font-size:1.55rem;letter-spacing:-.025em}h3{font-size:1.2rem}p{margin-bottom:1rem}[hidden]{display:none!important}.label{font-size:.75rem;font-weight:750;letter-spacing:.12em;color:var(--muted)}.muted{color:var(--muted)}.small{font-size:.875rem}.skip{position:absolute;left:-10000px;z-index:100;background:var(--panel);padding:12px}.skip:focus{left:10px;top:10px}.topbar{height:78px;border-bottom:1px solid var(--line);padding:0 36px;display:flex;align-items:center;justify-content:space-between;background:var(--bg);position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none;font-size:1.25rem;letter-spacing:-.03em}.brand strong>span{font-weight:400;color:var(--muted)}.brand-icon{display:grid;place-items:center;width:37px;height:40px;background:var(--accent);color:var(--ink);border-radius:9px;font-size:2rem;line-height:1;font-weight:800}.top-actions{display:flex;align-items:center;gap:24px}.icon-button{display:inline-grid;place-items:center;min-width:42px;min-height:42px;padding:6px;border:1px solid var(--line);border-radius:9px;background:transparent;font-size:1.2rem}.icon-button:hover{background:var(--panel2)}.layout{max-width:1510px;margin:auto;display:grid;grid-template-columns:244px minmax(0,1fr)}.sidebar{padding:38px 22px;position:sticky;top:78px;height:calc(100vh - 78px);border-right:1px solid var(--line);display:flex;flex-direction:column}.nav-label{margin:0 14px 20px}.sidebar nav{display:grid;gap:8px}.sidebar nav a{color:var(--muted);text-decoration:none;border:1px solid transparent;display:flex;align-items:center;gap:14px;padding:11px 14px;border-radius:8px;font-size:.9375rem;font-weight:600}.sidebar nav a span{width:20px;text-align:center;font-size:1.3rem}.sidebar nav a:hover{background:var(--panel)}.sidebar nav a.active{color:var(--accent);border-color:var(--line);background:var(--panel)}.side-note{margin-top:auto;padding:25px 14px 0;color:var(--muted);font-size:.8125rem}.side-note p{margin:8px 0 0;font-size:.875rem;color:var(--text)}main{padding:42px 48px 64px;min-width:0;outline:none}.intro{max-width:680px;margin-bottom:30px}.intro>.label{display:block;margin-bottom:14px;color:var(--accent)}.intro p{color:var(--muted);font-size:1.0625rem}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px}.section-top{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:0 0 18px}.section-top h2{margin:0}.section-top span{font-size:.875rem;color:var(--muted)}.chapter-list{border-top:1px solid var(--line)}.chapter-row{display:grid;grid-template-columns:48px minmax(0,1fr) 26px;gap:16px;align-items:center;padding:22px 4px;border-bottom:1px solid var(--line);color:var(--text);text-decoration:none}.chapter-row:hover{background:var(--panel)}.chapter-number{font-size:1.7rem;color:var(--muted);font-variant-numeric:tabular-nums;font-weight:350}.chapter-row h3{font-size:1.0625rem;margin:4px 0;font-weight:650}.chapter-row .label{font-size:.75rem}.chapter-row .chevron{font-size:1.5rem;color:var(--accent)}.study-card{background:var(--accent-soft);border:1px solid var(--accent);padding:26px;border-radius:14px;margin-bottom:18px}.study-card .label{color:var(--accent)}.study-card h2{font-size:1.75rem;margin:18px 0 12px}.study-card p{color:var(--muted);font-size:.9375rem}.study-card .big{font-size:3.5rem;line-height:1;letter-spacing:-.07em;display:block;margin-top:20px;color:var(--accent)}.study-card .big small{font-size:1rem;font-weight:500;letter-spacing:0;margin-left:10px}.panel{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:24px}.panel>p:last-child{margin-bottom:0}.quick-link{display:block;text-decoration:none;color:var(--text);padding:15px 0;border-bottom:1px solid var(--line)}.quick-link:last-child{border:0;padding-bottom:0}.quick-link strong{display:block}.quick-link span{color:var(--muted);font-size:.875rem}.button{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:10px 17px;color:var(--text);font-weight:650;font-size:.9375rem;text-decoration:none}.button:hover{background:var(--panel2)}.button.primary{background:var(--accent);border-color:var(--accent);color:var(--ink)}.button.primary:hover{filter:brightness(1.1)}.button.full{width:100%}.button.text{border-color:transparent;background:transparent;color:var(--accent);padding-left:0}.button.small{font-size:.875rem;min-height:38px;padding:6px 12px}.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.notice{border-left:3px solid var(--accent);background:var(--accent-soft);padding:14px 18px;font-size:.875rem;color:var(--muted);margin-top:30px}.notice strong{color:var(--text)}.page-end{margin-top:30px;color:var(--muted);font-size:.8125rem}.page-end a{color:var(--muted)}.breadcrumb{font-size:.875rem;color:var(--muted);margin-bottom:20px}.breadcrumb a{text-decoration:none}.reader{max-width:850px}.reader-toolbar{display:flex;justify-content:space-between;gap:14px;align-items:center;flex-wrap:wrap;padding:16px 0 22px;border-bottom:1px solid var(--line);margin-bottom:25px}.reader-toolbar .actions{gap:7px}.field{display:flex;gap:10px;flex-wrap:wrap;align-items:center}select,input[type=search]{background:var(--bg);border:1px solid var(--line);border-radius:7px;color:var(--text);padding:10px 12px;max-width:100%}label{font-size:.875rem;color:var(--muted)}.searchbox{display:flex;gap:10px;margin:22px 0 10px}.searchbox input{width:100%}.jump-nav{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0}.jump-nav a{border:1px solid var(--line);border-radius:6px;padding:5px 11px;color:var(--muted);text-decoration:none;font-size:.875rem}.legal-section{padding:30px 0;border-bottom:1px solid var(--line);scroll-margin-top:100px}.legal-section>h2{margin-bottom:20px}.reading-text{font-size:var(--reader);line-height:1.8}.reading-text p{margin-bottom:1.1em;overflow-wrap:anywhere}.reading-text h4{margin:25px 0 12px}.reading-text ul,.reading-text ol{padding-left:25px}.reading-text li{padding:3px 0}.source-row{display:flex;flex-wrap:wrap;gap:15px;font-size:.8125rem;margin-top:20px;color:var(--muted)}.source-row a{color:var(--muted)}.guide{border:1px solid var(--line);border-radius:10px;margin-top:22px;overflow:hidden;background:var(--panel)}.guide>summary{font-size:.9375rem;font-weight:650;padding:16px 20px;color:var(--green)}.guide>.reading-text{padding:0 22px 8px}.guide>summary::marker{color:var(--green)}.chapter-heading{border-top:2px solid var(--accent);margin-top:45px;padding-top:28px}.chapter-heading h2{font-size:1.9rem}.reader mark{background:var(--accent);color:var(--ink);padding:1px 2px}.search-status{font-size:.875rem;color:var(--muted)}.search-results{margin:10px 0}.search-results a{display:block;padding:10px 0;border-bottom:1px solid var(--line)}.empty{color:var(--muted);padding:20px}.reference-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:25px}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;margin:20px 0}table{border-collapse:collapse;width:100%;font-size:.9375rem;font-variant-numeric:tabular-nums}caption{text-align:left;padding:16px;font-weight:700;background:var(--panel)}th,td{text-align:left;border-top:1px solid var(--line);padding:11px 15px}thead th{background:var(--panel2);font-size:.8125rem}tbody tr:nth-child(even){background:var(--panel)}td:last-child{color:var(--muted)}.method-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:20px 0}.method{border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:8px;background:var(--panel);padding:20px}.method h3{margin:12px 0 16px}.method-step{border-top:1px solid var(--line);padding:12px 0;font-size:.9375rem}.method-step:last-child{padding-bottom:0}.method-note{font-size:.875rem;color:var(--muted);margin:14px 0 0}.setup{max-width:880px}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:24px 0}.form-grid label{display:grid;min-width:0;gap:7px;font-weight:600;color:var(--text)}.form-grid select{width:100%;min-width:0;max-width:100%;text-overflow:ellipsis}.exam-stats{display:flex;gap:32px;padding:20px 0}.exam-stats strong{font-size:1.8rem;display:block;color:var(--accent)}.exam-stats span{font-size:.875rem;color:var(--muted)}.quiz{max-width:820px}.quiz-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}.quiz-header p{margin:0}.quiz progress{margin-bottom:30px}.quiz h1{font-size:clamp(1.5rem,3vw,2rem);line-height:1.45;letter-spacing:-.025em}.options{display:grid;gap:12px;margin:28px 0}.option{display:flex;align-items:center;gap:16px;text-align:left;width:100%;border:1px solid var(--line);border-radius:9px;background:var(--panel);padding:17px 20px;font-size:1rem}.option:hover:not(:disabled){border-color:var(--accent)}.option .letter{display:grid;place-items:center;width:32px;height:32px;flex-shrink:0;border:1px solid var(--line);border-radius:7px;color:var(--muted);font-size:.875rem}.option.selected{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}.option.correct{border-color:var(--green);background:var(--green-bg)}.option.wrong{border-color:var(--red);background:var(--red-bg)}.option:disabled{opacity:1}.feedback{border-radius:9px;padding:20px;margin:20px 0;background:var(--green-bg);border:1px solid var(--green)}.feedback.wrong{background:var(--red-bg);border-color:var(--red)}.feedback h2{font-size:1.1rem}.feedback p{margin-bottom:12px}.quiz-footer{display:flex;justify-content:space-between;align-items:center;gap:15px;flex-wrap:wrap;margin-top:25px}progress{width:100%;height:6px;appearance:none;border:0;border-radius:8px;overflow:hidden;background:var(--line)}progress::-webkit-progress-bar{background:var(--line)}progress::-webkit-progress-value{background:var(--accent)}progress::-moz-progress-bar{background:var(--accent)}.result-score{display:flex;align-items:baseline;gap:8px;line-height:1;margin:24px 0}.result-score strong{font-size:5rem;color:var(--accent);letter-spacing:-.06em}.result-score span{font-size:1.5rem;color:var(--muted)}.review-list{margin-top:30px}.review-list>details{padding:18px 0;border-top:1px solid var(--line)}.review-list summary{font-size:1rem;font-weight:650}.review-list p{margin:14px 0;font-size:.9375rem}.result-tag{margin-right:10px;color:var(--green)}.result-tag.wrong{color:var(--red)}.source-card{border-top:1px solid var(--line);padding:25px 0}.source-card h2{font-size:1.2rem;margin-bottom:12px}.source-card p{max-width:760px;color:var(--muted)}.source-card a{overflow-wrap:anywhere}.player{position:fixed;bottom:18px;right:24px;z-index:40;width:min(660px,calc(100vw - 32px));background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 22px;box-shadow:0 16px 50px #0006}.player-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.player-head strong{display:block;font-size:1rem}.player-controls{display:flex;align-items:flex-end;gap:10px;margin:15px 0}.player-controls label{display:grid;gap:4px;min-width:0}.player-controls label:first-of-type{flex:1}.player-controls select{padding:9px 8px;width:100%;font-size:.875rem}.player p{font-size:.8125rem;margin:8px 0 0}.player p[role=status]{color:var(--accent)}body.audio-open main{padding-bottom:300px}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:var(--text);color:var(--bg);padding:12px 22px;border-radius:10px;z-index:60;box-shadow:0 4px 30px #0004}.reading-active{outline:2px solid var(--accent);outline-offset:7px;border-radius:3px}
@media(min-width:1500px){main{padding-top:52px}}@media(max-width:1150px){main{padding:30px}.workspace{grid-template-columns:minmax(0,1fr) 250px;gap:22px}.layout{grid-template-columns:218px minmax(0,1fr)}.sidebar{padding-left:14px;padding-right:14px}.study-card{padding:20px}.method-grid{grid-template-columns:1fr}.method{padding:18px}.reference-grid{grid-template-columns:1fr}}@media(max-width:880px){.layout{display:block}.topbar{height:66px;padding:0 22px}.sidebar{position:static;height:auto;border:0;border-bottom:1px solid var(--line);padding:8px 16px}.sidebar nav{display:flex;gap:5px;overflow-x:auto}.sidebar nav a{white-space:nowrap;padding:8px 12px;font-size:.875rem}.sidebar nav a span{font-size:1.05rem;width:auto}.side-note,.nav-label{display:none}main{padding:30px 22px 55px}.workspace{grid-template-columns:minmax(0,1fr) 270px}.method-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.method-grid .method{min-width:0;padding:15px}.method-grid h3{font-size:1rem}.method-step{font-size:.875rem}}@media(max-width:660px){.desktop{display:none}.topbar{padding:0 17px}.brand{font-size:1.1rem}.brand-icon{width:32px;height:35px}.sidebar{padding:7px 9px}.sidebar nav a{padding:8px 10px}.sidebar nav a span{display:none}.workspace,.mode-grid,.form-grid,.method-grid{grid-template-columns:1fr}.workspace{gap:28px}.workspace aside{display:grid;grid-template-columns:1fr;gap:16px}.study-card{margin:0}.study-card .big{font-size:2.5rem}.study-card h2{margin-top:12px}.intro{margin-bottom:24px}main{padding:27px 18px 48px}h1{font-size:2rem}.chapter-row{grid-template-columns:36px minmax(0,1fr) 18px;gap:10px;padding:18px 0}.chapter-number{font-size:1.4rem}.reader-toolbar{align-items:flex-start}.legal-section{padding:25px 0}.reading-text{font-size:var(--reader)}.guide>.reading-text{padding:0 16px 5px}.player{bottom:8px;right:8px;width:calc(100vw - 16px);padding:14px}.player-controls{gap:6px;flex-wrap:wrap}.player-controls .icon-button{min-width:36px}.player-controls label:first-of-type{min-width:130px}.player-controls label:last-of-type{width:72px}.option{padding:15px 14px;gap:12px}.exam-stats{gap:25px}.reference-grid{grid-template-columns:1fr}.section-top{align-items:baseline}.section-top h2{font-size:1.35rem}.section-top span{font-size:.8125rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{.topbar,.sidebar,.reader-toolbar,.player,.jump-nav,.actions,.searchbox,.search-status,.page-end,.source-row,.breadcrumb{display:none!important}.layout{display:block}main{padding:0}body{background:#fff;color:#111}.guide{break-inside:auto;background:#fff}details.guide>.reading-text{display:block!important}.reading-text{font-size:11pt}.legal-section{break-inside:auto}.table-wrap{overflow:visible}a{color:#111}.notice{background:#fff}h1,h2,h3{break-after:avoid}}

.audio-timeline{display:flex;align-items:center;gap:12px}.audio-timeline input{min-width:0;flex:1;width:100%;accent-color:var(--accent);cursor:pointer;min-height:28px}.audio-timeline span{font-size:.875rem;font-variant-numeric:tabular-nums;white-space:nowrap}.audio-options{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.audio-options label{display:flex;align-items:center;gap:7px;color:var(--text);font-size:.9375rem}.audio-options input{accent-color:var(--accent);width:18px;height:18px}.player-controls label:first-of-type{flex:0 1 110px}.player-controls .icon-button{font-size:.9375rem}.player-head #audio-position{display:block}.reading-active{background:var(--accent-soft);outline:2px solid var(--accent);outline-offset:6px;border-radius:3px;scroll-margin-top:120px}.player #audio-status:empty{display:none}.player #audio-status{font-size:.875rem}body.audio-open main{padding-bottom:380px}@media(max-width:660px){.player-controls label:first-of-type{min-width:85px}.audio-options{gap:10px}.audio-options label{font-size:.875rem}.audio-timeline{gap:8px}.audio-timeline span{font-size:.8125rem}}

.audio-jump{display:flex;align-items:flex-end;gap:10px;margin:12px 0}.audio-jump label{display:grid;gap:4px;flex:1;min-width:0}.audio-jump select{width:100%;min-width:0;text-overflow:ellipsis;font-size:.9375rem}.audio-jump .button{white-space:nowrap}.audio-timeline input{min-height:44px;touch-action:none}.audio-timeline input:focus-visible{outline-offset:2px}body.audio-open main{padding-bottom:440px}

/* A font-independent brand mark and a compact reading player. */
.brand-icon{width:40px;height:40px;flex-shrink:0}
.brand-icon svg{display:block;width:32px;height:32px}
.player{max-height:calc(100dvh - 92px);overflow:auto;bottom:max(18px,env(safe-area-inset-bottom))}
.player-heading{min-width:0;flex:1}
.player-head-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}
.player-head-actions .button{min-height:42px}
.player.is-compact{width:min(560px,calc(100vw - 32px));padding:10px 14px;display:grid;grid-template-columns:auto minmax(0,1fr);column-gap:16px;row-gap:4px}
.player.is-compact .player-head{grid-column:1/-1}
.player.is-compact .player-kicker,.player.is-compact #audio-position{display:none}
.player.is-compact #audio-title{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.9375rem}
.player.is-compact .player-controls{margin:0;align-items:center;gap:6px;flex-wrap:nowrap}
.player.is-compact .player-controls .button{min-width:88px;padding:8px 12px}
.player.is-compact .audio-timeline{min-width:0;gap:8px}
.player.is-compact .audio-timeline span{font-size:.8125rem}
.player.is-compact #audio-status,.player.is-compact #audio-retry{grid-column:1/-1}
.player.is-compact #audio-retry{justify-self:start}
body.audio-open.audio-compact main{padding-bottom:210px}
@media(max-width:660px){
  .brand-icon{width:35px;height:35px}.brand-icon svg{width:28px;height:28px}
  .player{bottom:max(8px,env(safe-area-inset-bottom))}
  .player-head{align-items:flex-start}.player-head-actions{gap:5px}
  .player-head-actions .button{padding:6px 9px}
  .player.is-compact{width:calc(100vw - 16px)}
  .player.is-compact .player-head{align-items:center}
}
@media(max-width:540px){
  .player.is-compact{grid-template-columns:minmax(0,1fr);row-gap:2px}
  .player.is-compact .player-controls{justify-content:center}
}