:root{--bg: #f6f4ef;--surface: #ffffff;--surface-2: #f0ede6;--ink: #1d1f23;--ink-2: #4a4f57;--ink-3: #7b8089;--line: #e2ddd2;--accent: #2563EB;--accent-soft: #eff6ff;--accent-border: color-mix(in srgb, var(--accent) 28%, transparent);--accent-shadow: 0 4px 14px color-mix(in srgb, var(--accent) 25%, transparent);--ok: #1d7a4c;--ok-soft: #e2f3ea;--bad: #b3372d;--bad-soft: #fbe7e4;--warn-soft: #fff3d6;--shadow: 0 1px 2px rgba(30, 25, 15, .05), 0 6px 20px rgba(30, 25, 15, .05);--radius: 14px;--serif: "Source Serif 4", Georgia, serif;--sans: "Be Vietnam Pro", system-ui, -apple-system, sans-serif;color-scheme:light}@media (prefers-color-scheme: dark){:root{--bg: #15171a;--surface: #1d2024;--surface-2: #25292e;--ink: #ecebe7;--ink-2: #b9bcc1;--ink-3: #868b93;--line: #30353b;--accent: #4c9aff;--accent-soft: rgba(76, 154, 255, .18);--accent-border: rgba(76, 154, 255, .38);--accent-shadow: 0 4px 16px rgba(76, 154, 255, .3);--ok: #5cc88d;--ok-soft: #173427;--bad: #f07a6e;--bad-soft: #3d1f1c;--warn-soft: #3a3120;--shadow: 0 1px 2px rgba(0, 0, 0, .3);color-scheme:dark}}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}button,input,select{font:inherit;color:inherit}select option{background-color:var(--surface);color:var(--ink)}select optgroup{background-color:var(--surface);color:var(--accent);font-weight:700;font-style:normal;padding:6px 4px}button{cursor:pointer}h1,h2,h3,h4,h5{margin:0;line-height:1.25}h2{font-size:1.25rem;margin-bottom:12px}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 24px;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;border:0;background:none;text-align:left;padding:0}.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--accent);color:var(--surface);font-family:var(--serif);font-weight:600;font-size:18px}.brand strong{display:block;font-size:15px}.brand small{display:block;color:var(--ink-3);font-size:12px}.topbar nav{display:flex;gap:4px}.topbar nav button{border:0;background:none;padding:7px 12px;border-radius:8px;color:var(--ink-2);font-weight:500}.topbar nav button.active,.topbar nav button:hover{background:var(--surface-2);color:var(--ink)}.book-picker{display:flex;align-items:center;gap:8px;margin-right:auto;padding:3px 4px 3px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}.book-picker-lbl{color:var(--ink-3);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}.book-picker select{border:0;background:transparent;padding:5px 6px;font-weight:600;color:var(--ink);cursor:pointer;max-width:220px}.book-picker select option{background-color:var(--surface);color:var(--ink);padding:6px 10px}.book-picker select:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}.notice{margin:24px 0 0;padding:14px 18px;border-radius:var(--radius);background:var(--warn-soft);color:var(--ink-2)}.page{max-width:1180px;margin:0 auto;padding:28px 24px 80px}.page section{margin-top:36px}.eyebrow{margin:0 0 6px;color:var(--accent);font-weight:600;font-size:13px;letter-spacing:.02em;text-transform:uppercase}.lead{color:var(--ink-2);max-width:62ch;margin:10px 0 0}.muted{color:var(--ink-3);margin:-6px 0 14px}.empty{color:var(--ink-3);padding:40px 0;text-align:center}.btn{border:1px solid var(--line);background:var(--surface);padding:9px 16px;border-radius:10px;font-weight:600}.btn:hover:not(:disabled){border-color:var(--ink-3)}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--surface)}.btn:disabled{opacity:.45;cursor:default}.link{border:0;background:none;padding:0;color:var(--ink-3);text-decoration:underline;text-underline-offset:3px}.link:hover{color:var(--ink)}.skill-nav-section{margin-bottom:28px;display:flex;flex-direction:column;gap:16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 20px;box-shadow:var(--shadow)}.skill-nav-tabs{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.skill-nav-tab{display:flex;align-items:center;gap:14px;padding:12px 18px;border-radius:12px;border:2px solid var(--line);background:var(--surface-2);cursor:pointer;text-align:left;transition:all .2s ease}.skill-nav-tab:hover{border-color:var(--accent-border);background:var(--surface)}.skill-nav-tab.active{border-color:var(--accent);background:var(--accent-soft);box-shadow:var(--accent-shadow)}.skill-nav-icon{font-size:28px;line-height:1;flex-shrink:0}.skill-nav-text{display:flex;flex-direction:column;gap:2px;min-width:0}.skill-nav-title{font-size:16px;font-weight:700;color:var(--ink)}.skill-nav-tab.active .skill-nav-title{color:var(--accent)}.skill-nav-desc{font-size:12.5px;color:var(--ink-3);font-weight:500}.skill-books-row{display:flex;flex-direction:column;gap:10px;padding-top:14px;border-top:1px dashed var(--line)}.skill-books-heading{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--ink-3)}.skill-books-cards{display:flex;flex-wrap:wrap;gap:12px}.book-card-item{flex:1 1 200px;max-width:320px;display:flex;flex-direction:column;gap:6px;padding:10px 14px;border-radius:10px;border:1px solid var(--line);background:var(--surface);cursor:pointer;text-align:left;transition:all .15s ease}.book-card-item:hover{border-color:var(--accent);transform:translateY(-1px)}.book-card-item.active{border-color:var(--accent);background:var(--accent-soft);outline:2px solid var(--accent);outline-offset:-2px}.book-card-header{display:flex;align-items:center;gap:8px}.book-badge{font-size:10px;font-weight:700;padding:2px 6px;border-radius:4px;background:#3b82f6;color:#fff;letter-spacing:.05em}.book-badge.lc{background:#ec4899}.book-card-title{font-size:14px;font-weight:700;color:var(--ink)}.book-card-sub{display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--ink-3)}.book-card-progress{color:var(--ok);font-weight:600}.book-card-fresh{color:var(--ink-3)}@media (max-width: 640px){.skill-nav-tabs{grid-template-columns:1fr}.book-card-item{max-width:none}}.hero{display:grid;grid-template-columns:1.5fr 1fr;gap:32px;align-items:end}.hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(1.8rem,3.6vw,2.6rem);letter-spacing:-.01em}.hero-stats{display:grid;grid-template-columns:repeat(3,1fr);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.hero-stats>div{padding:16px;border-left:1px solid var(--line)}.hero-stats>div:first-child{border-left:0}.num{display:block;font-size:1.7rem;font-weight:700;font-variant-numeric:tabular-nums}.lbl{display:block;color:var(--ink-3);font-size:13px}.section-head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:12px}.section-head h2{margin:0}.section-head p{margin:0;color:var(--ink-3)}.test-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}.test-card{position:relative;display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:14px 16px 16px;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .12s,border-color .12s}.test-card:hover:not(:disabled){transform:translateY(-2px);border-color:var(--accent)}.test-card.disabled{opacity:.5;box-shadow:none;cursor:default}.test-card-reset{position:absolute;top:8px;right:8px;width:24px;height:24px;border-radius:99px;background:var(--surface-2);border:1px solid var(--line);color:var(--ink-3);display:flex;align-items:center;justify-content:center;font-size:11px;cursor:pointer;opacity:.6;transition:all .15s ease;z-index:2}.test-card:hover .test-card-reset,.test-card-reset:focus-visible{opacity:1}.test-card-reset:hover{background:color-mix(in srgb,var(--bad) 12%,var(--surface));border-color:var(--bad);color:var(--bad);transform:scale(1.1)}.test-no{font-family:var(--serif);font-size:2rem;font-weight:600;line-height:1}.test-label{color:var(--ink-3);font-size:12px;text-transform:uppercase;letter-spacing:.06em}.test-meta{color:var(--ink-3);font-size:12.5px}.bar{display:block;width:100%;height:5px;margin:10px 0 6px;border-radius:5px;background:var(--surface-2);overflow:hidden}.bar>span{display:block;height:100%;background:var(--accent);border-radius:5px}.chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}.chip{border:1px solid var(--line);background:var(--surface);border-radius:99px;padding:4px 12px;font-size:13px;color:var(--ink-3)}.chip.on{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:600}.part-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.part-card{display:flex;flex-direction:column;align-items:flex-start;gap:4px;padding:18px;text-align:left;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow)}.part-card:hover:not(:disabled){border-color:var(--accent)}.part-name{font-size:1.2rem;font-weight:700}.part-desc{color:var(--ink-2)}.part-meta{margin-top:8px;color:var(--ink-3);font-size:13px}.split{display:grid;grid-template-columns:1fr 1fr;gap:12px}.panel{padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.panel p{color:var(--ink-2);margin:6px 0 14px}.reset{margin-top:40px;text-align:center}.page.quiz{max-width:1720px;padding-top:16px;padding-inline:20px}.quiz-bar{display:flex;align-items:center;gap:16px;justify-content:space-between;padding-bottom:14px;border-bottom:1px solid var(--line)}.quiz-title{text-align:center}.quiz-title strong{display:block}.quiz-title span{color:var(--ink-3);font-size:13px}.quiz-bar-right{display:flex;align-items:center;gap:16px}.score{color:var(--ink-3);font-size:13px;font-variant-numeric:tabular-nums}.score b{color:var(--ok)}.mode-toggle{display:inline-flex;align-items:center;background:var(--surface-2);border:1px solid var(--line);border-radius:99px;padding:2px}.mode-btn{border:0;background:none;padding:5px 12px;font-size:12.5px;font-weight:600;color:var(--ink-2);border-radius:99px;cursor:pointer;transition:background .15s,color .15s}.mode-btn:hover{color:var(--ink)}.mode-btn.active{background:var(--surface);color:var(--accent);box-shadow:0 1px 3px #00000014}.home-mode-select{margin-top:18px;display:flex;align-items:center;flex-wrap:wrap;gap:10px}.mode-label{font-size:13px;font-weight:600;color:var(--ink-2)}.exam-banner{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-top:14px;padding:12px 18px;background:var(--warn-soft);border:1px solid rgba(180,130,20,.25);border-radius:var(--radius);font-size:13.5px;color:var(--ink)}.exam-banner.submitted{background:var(--ok-soft);border-color:#1d7a4c40}.exam-submit-top{padding:6px 14px;font-size:13px;white-space:nowrap}.opt.opt-selected{border-color:var(--accent);background:var(--accent-soft)}.opt.opt-selected .opt-key{background:var(--accent);border-color:var(--accent);color:#fff}.dot.filled-exam{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:600}.legend-dot.filled-exam{background:var(--accent-soft);border-color:var(--accent)}.quiz-container-3col{display:flex;gap:20px;align-items:flex-start;margin-top:14px;position:relative;width:100%}.quiz-center-area{flex:1;min-width:0}.quiz-center-area .workspace{margin-top:0}.quiz-sidebar{flex:none;width:245px;position:sticky;top:72px;max-height:calc(100vh - 88px);overflow-y:auto;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);display:flex;flex-direction:column;box-shadow:var(--shadow);scrollbar-width:thin;z-index:10}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--surface-2);border-top-left-radius:var(--radius);border-top-right-radius:var(--radius);position:sticky;top:0;z-index:2}.sidebar-header-title{display:flex;align-items:center;gap:8px}.sidebar-header-icon{font-size:16px}.sidebar-header-title strong{display:block;font-size:13.5px;line-height:1.2}.sidebar-header-sub{display:block;font-size:11.5px;color:var(--ink-3)}.sidebar-close-btn{background:none;border:0;color:var(--ink-3);font-size:14px;padding:4px 6px;border-radius:4px;cursor:pointer}.sidebar-close-btn:hover{background:var(--line);color:var(--ink)}.sidebar-progress-track{height:4px;background:var(--line);width:100%;overflow:hidden}.sidebar-progress-fill{height:100%;background:var(--accent);transition:width .25s ease}.sidebar-legend-strip{display:flex;gap:8px;padding:6px 12px;font-size:11px;background:color-mix(in srgb,var(--surface-2) 60%,transparent);border-bottom:1px solid var(--line)}.legend-tag{display:inline-flex;align-items:center;gap:3px;font-weight:500}.legend-tag.ok{color:var(--ok)}.legend-tag.bad{color:var(--bad)}.legend-tag.filled{color:var(--accent)}.legend-tag.empty{color:var(--ink-3)}.omr-toolbar{display:flex;align-items:center;justify-content:space-between;padding:6px 12px;background:color-mix(in srgb,var(--surface-2) 45%,transparent);border-bottom:1px solid var(--line);-webkit-user-select:none;user-select:none}.omr-scroll-toggle{display:inline-flex;align-items:center;width:100%;justify-content:space-between;cursor:pointer;font-size:11.5px;color:var(--ink-2);line-height:1.2}.omr-scroll-toggle:hover{color:var(--ink)}.omr-scroll-toggle-title{display:inline-flex;align-items:center;gap:5px;font-weight:500}.omr-scroll-toggle-icon{font-size:12px;line-height:1}.omr-scroll-checkbox{position:absolute;opacity:0;width:0;height:0;pointer-events:none}.omr-scroll-switch{position:relative;width:28px;height:16px;background:color-mix(in srgb,var(--ink-3) 40%,var(--line));border-radius:99px;transition:background-color .2s cubic-bezier(.16,1,.3,1);flex-shrink:0}.omr-scroll-knob{position:absolute;top:2px;left:2px;width:12px;height:12px;background:#fff;border-radius:50%;box-shadow:0 1px 3px #00000040;transition:transform .2s cubic-bezier(.16,1,.3,1)}.omr-scroll-checkbox:checked+.omr-scroll-switch{background:var(--accent)}.omr-scroll-checkbox:checked+.omr-scroll-switch .omr-scroll-knob{transform:translate(12px)}.omr-scroll-checkbox:focus-visible+.omr-scroll-switch{outline:2px solid var(--accent);outline-offset:1px}.sidebar-body{padding:10px 12px;display:flex;flex-direction:column;gap:14px;flex:1}.sidebar-part-group{display:flex;flex-direction:column;gap:8px}.sidebar-part-head{display:flex;align-items:center;justify-content:space-between;padding-bottom:4px;border-bottom:1px dashed var(--line)}.sidebar-part-badge{font-size:12px;font-weight:700;color:var(--ink-2);text-transform:uppercase;letter-spacing:.03em}.sidebar-part-group.is-active-part .sidebar-part-badge{color:var(--accent)}.sidebar-part-stats{font-size:11.5px;color:var(--ink-3);font-variant-numeric:tabular-nums}.sidebar-q-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(34px,1fr));gap:5px}.sidebar-q-dot{width:100%;height:30px;font-size:12px}.omr-sheet-list{display:flex;flex-direction:column;gap:3px}.omr-row{display:flex;align-items:center;justify-content:space-between;padding:4px 6px;border-radius:6px;transition:all .15s ease;border-left:3px solid transparent;scroll-margin-block:40px}.omr-row:hover{background:var(--surface-2)}.omr-row.is-cur{background:color-mix(in srgb,var(--accent) 14%,var(--surface));border-left-color:var(--accent);box-shadow:0 1px 6px color-mix(in srgb,var(--accent) 16%,transparent)}.omr-qnum{background:none;border:none;padding:2px 4px;font-family:var(--mono);font-size:12px;font-weight:700;color:var(--ink-2);cursor:pointer;border-radius:4px;min-width:32px;text-align:left;transition:color .15s ease}.omr-qnum:hover{color:var(--accent);text-decoration:underline}.omr-row.is-cur .omr-qnum{color:var(--accent)}.omr-bubbles{display:flex;align-items:center;gap:4px}.omr-bubble{width:28px;height:28px;border-radius:50%;border:1px solid var(--line);background:var(--surface-2);color:var(--ink-2);font-size:12px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all .15s cubic-bezier(.4,0,.2,1);padding:0;-webkit-user-select:none;user-select:none}.omr-bubble:hover:not(:disabled){border-color:var(--accent);color:var(--accent);background:var(--surface);transform:scale(1.08)}.omr-bubble.selected{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:800;box-shadow:0 2px 8px color-mix(in srgb,var(--accent) 40%,transparent);transform:scale(1.05)}.omr-bubble.correct{background:var(--ok);border-color:var(--ok);color:#fff;font-weight:800;box-shadow:0 2px 8px color-mix(in srgb,var(--ok) 35%,transparent)}.omr-bubble.wrong{background:var(--bad);border-color:var(--bad);color:#fff;font-weight:800;box-shadow:0 2px 8px color-mix(in srgb,var(--bad) 35%,transparent)}.omr-bubble.target-key{background:var(--ok-soft);border-color:var(--ok);color:var(--ok);font-weight:800}.sidebar-footer{padding:10px 12px;border-top:1px solid var(--line);background:var(--surface-2);position:sticky;bottom:0;border-bottom-left-radius:var(--radius);border-bottom-right-radius:var(--radius)}.sidebar-action-btn{width:100%;font-size:12.5px;padding:8px 10px;justify-content:center}.sidebar-reset-btn{width:100%;margin-top:6px;font-size:11.5px;padding:6px 10px;justify-content:center;background:transparent;border:1px dashed var(--line);color:var(--ink-3);border-radius:var(--radius-sm);cursor:pointer;transition:all .15s ease}.sidebar-reset-btn:hover{background:color-mix(in srgb,var(--bad) 8%,var(--surface));border-color:var(--bad);border-style:solid;color:var(--bad)}.sidebar-tab-reopen{position:sticky;top:72px;flex:none;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:10px 8px;font-size:12px;font-weight:600;color:var(--ink-2);cursor:pointer;display:flex;align-items:center;gap:6px;box-shadow:var(--shadow);transition:all .15s ease;white-space:nowrap}.sidebar-tab-reopen:hover{background:var(--surface-2);border-color:var(--accent);color:var(--accent)}.sidebar-toggles{display:flex;align-items:center;gap:6px}.sidebar-toggle-btn{font-size:12px;padding:5px 10px;border-radius:99px;background:var(--surface-2);border:1px solid var(--line);color:var(--ink-2);cursor:pointer;display:inline-flex;align-items:center;gap:5px;transition:all .15s ease}.sidebar-toggle-btn:hover{background:var(--surface);border-color:var(--ink-3)}.sidebar-toggle-btn.active{background:color-mix(in srgb,var(--accent) 12%,var(--surface));border-color:var(--accent);color:var(--accent);font-weight:600}.part-nav-tabs{display:flex;gap:8px;margin-bottom:16px;overflow-x:auto;padding-bottom:2px}.part-nav-tab{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:99px;background:var(--surface);border:1px solid var(--line);color:var(--ink-2);font-weight:600;font-size:13.5px;cursor:pointer;transition:all .15s ease;white-space:nowrap}.part-nav-tab:hover{background:var(--surface-2);border-color:var(--ink-3);color:var(--ink)}.part-nav-tab.active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 2px 8px color-mix(in srgb,var(--accent) 35%,transparent)}.part-nav-tab .tab-badge{font-size:11.5px;padding:1px 7px;border-radius:99px;background:var(--surface-2);color:var(--ink-2);font-variant-numeric:tabular-nums;transition:all .15s ease}.part-nav-tab.active .tab-badge{background:#ffffff38;color:#fff}.part-flow-workspace{display:flex;flex-direction:column;gap:32px}.part-5-workspace{max-width:820px;margin:0 auto;width:100%}.part-flow-intro{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 18px;margin-bottom:16px}.part-flow-intro h3{margin:0 0 4px;font-size:16px;color:var(--ink)}.part-flow-intro p{margin:0;font-size:13px;color:var(--ink-3)}.part-5-qcol{display:flex;flex-direction:column;gap:16px}.passage-section{display:flex;flex-direction:column;gap:10px;padding-bottom:24px;border-bottom:1px solid var(--line)}.passage-section:last-of-type{border-bottom:none;padding-bottom:0}.section-divider-bar{display:flex;align-items:center;justify-content:space-between}.section-tag{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:var(--ink-3);background:var(--surface-2);padding:3px 10px;border-radius:99px;border:1px solid var(--line)}.section-layout-btn{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;color:var(--ink-2);background:var(--surface);border:1px solid var(--line);padding:4px 12px;border-radius:99px;cursor:pointer;-webkit-user-select:none;user-select:none;transition:all .15s ease}.section-layout-btn:hover{background:var(--surface-2);color:var(--ink);border-color:var(--ink-3)}.section-layout-btn.is-split{background:color-mix(in srgb,var(--accent) 10%,var(--surface));color:var(--accent);border-color:var(--accent)}.part-switch-footer{display:flex;align-items:center;justify-content:center;gap:16px;padding-top:16px;margin-top:8px}.part-switch-btn{font-size:14px;padding:10px 22px;font-weight:600;border-radius:99px}.pblank.unrevealed{background:var(--accent-soft);border-bottom-color:var(--accent);color:var(--accent)}.workspace{margin-top:20px;max-width:780px;margin-inline:auto}.workspace.two-col{display:grid;grid-template-columns:minmax(0,1.1fr) 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