:root,[data-theme=light]{color-scheme:light;--color-ink: #212121;--color-ink-secondary: #5f5f66;--color-ink-tertiary: #74747e;--color-ink-disabled: #bebec5;--color-ink-inverse: #ffffff;--color-surface: #ffffff;--color-surface-elevated: #ffffff;--color-surface-subtle: #eeece7;--color-surface-hover: #f5f4f0;--color-surface-overlay: rgba(255, 255, 255, .88);--color-surface-dark: #17171c;--color-surface-green: #003c33;--color-surface-navy: #071829;--color-surface-pale-green: #edfce9;--color-surface-pale-blue: #f1f5ff;--color-nav: rgba(255, 255, 255, .9);--color-nav-hover: #f5f4f0;--color-nav-active: transparent;--color-nav-text: #212121;--color-nav-text-secondary: #666670;--color-nav-border: #e5e5e8;--color-nav-divider: #e5e5e8;--color-border: #d9d9dd;--color-border-strong: #b8b8c0;--color-border-soft: #f2f2f2;--color-signal: #ff7759;--color-accent: #c2410c;--color-accent-hover: #a83808;--color-accent-subtle: rgba(255, 119, 89, .12);--color-accent-pressed: #8f2f05;--color-on-accent: #ffffff;--color-brand: #17171c;--color-brand-hover: #000000;--color-brand-subtle: #eeece7;--color-on-brand: #ffffff;--color-on-danger: #ffffff;--color-action: #17171c;--color-action-hover: #000000;--color-action-inverse: #ffffff;--color-link: #1863dc;--color-coral: #ff7759;--color-coral-soft: #ffad9b;--stage-bg: var(--color-surface-subtle);--stage-ink: var(--color-ink);--stage-lime: var(--color-ink);--color-success: #126b4d;--color-success-subtle: rgba(18, 107, 77, .08);--color-error: #b30000;--color-error-subtle: rgba(179, 0, 0, .07);--color-warning: #8a5300;--color-warning-subtle: rgba(138, 83, 0, .08);--color-info: #1863dc;--color-info-subtle: rgba(24, 99, 220, .07);--color-reading: #1863dc;--color-reading-subtle: rgba(24, 99, 220, .08);--color-writing: #196249;--color-writing-subtle: rgba(25, 98, 73, .08);--color-speaking: #c2410c;--color-speaking-subtle: rgba(194, 65, 12, .08);--color-listening: #57509a;--color-listening-subtle: rgba(87, 80, 154, .08);--color-toeic: 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#101110;--color-on-danger: #101110;--color-action: #f2f2ef;--color-action-hover: #ffffff;--color-action-inverse: #101110;--color-link: #8fb0ff;--color-coral: #ff8a70;--color-coral-soft: #ffc2b3;--color-success: #74c9a2;--color-success-subtle: rgba(116, 201, 162, .1);--color-error: #ff9b8c;--color-error-subtle: rgba(255, 155, 140, .1);--color-warning: #efbc72;--color-warning-subtle: rgba(239, 188, 114, .1);--color-info: #8fb0ff;--color-info-subtle: rgba(143, 176, 255, .1);--color-reading: #8fb0ff;--color-reading-subtle: rgba(143, 176, 255, .1);--color-writing: #8fceb6;--color-writing-subtle: rgba(143, 206, 182, .1);--color-speaking: #ff9b82;--color-speaking-subtle: rgba(255, 155, 130, .1);--color-listening: #b5afe7;--color-listening-subtle: rgba(181, 175, 231, .1);--color-toeic: #d7a1b1;--color-toeic-subtle: rgba(215, 161, 177, .1);--color-chart-grid: #2d2e2b;--color-chart-label: #8d8d98;--color-chart-point: #141513;--color-scrollbar: #353633;--color-scrollbar-hover: #57584f;--color-selection: rgba(255, 138, 112, .26);--shadow-xs: 0 0 0 0 transparent;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .45);--shadow: 0 2px 8px rgba(0, 0, 0, .5);--shadow-md: 0 10px 30px -12px rgba(0, 0, 0, .65);--shadow-lg: 0 24px 60px -24px rgba(0, 0, 0, .8), 0 0 0 1px rgba(255, 255, 255, .05);--shadow-xl: 0 40px 90px -32px rgba(0, 0, 0, .85);--shadow-accent: 0 0 0 3px rgba(255, 138, 112, .22);--shadow-error: 0 0 0 3px rgba(255, 155, 140, .2);--focus-ring: 0 0 0 2px var(--color-surface-elevated), 0 0 0 4px #8fa8ff}:root{--font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-display: "Space Grotesk", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-mono: "Geist Mono", ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;--font-pixel: "Silkscreen", var(--font-mono);--text-2xs: 11px;--text-xs: 12px;--text-sm: 14px;--text-base: 16px;--text-lg: 18px;--text-xl: 22px;--text-2xl: 28px;--text-3xl: 36px;--text-4xl: 48px;--text-5xl: 64px;--text-6xl: 88px;--text-7xl: 112px;--font-light: 300;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--font-extrabold: 800;--lh-tight: 1.04;--lh-snug: 1.2;--lh-normal: 1.55;--lh-relaxed: 1.7;--tracking-tight: -.02em;--tracking-tighter: -.032em;--tracking-display: -.045em;--tracking-meta: .08em;--spacing-1: 4px;--spacing-2: 8px;--spacing-3: 12px;--spacing-4: 16px;--spacing-5: 20px;--spacing-6: 24px;--spacing-8: 32px;--spacing-10: 40px;--spacing-12: 48px;--spacing-14: 56px;--spacing-16: 64px;--spacing-20: 80px;--spacing-24: 96px;--spacing-32: 128px;--radius-xs: 4px;--radius-sm: 8px;--radius: 10px;--radius-lg: 16px;--radius-xl: 22px;--radius-2xl: 30px;--radius-full: 9999px;--radius-doc: var(--radius-panel);--radius-panel: 14px;--control-h-sm: 34px;--control-h-md: 42px;--control-h-lg: 52px;--grid-size: 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var(--color-ink-secondary);--color-background: var(--color-surface);--color-accent-dark: var(--color-accent-hover);--color-accent-light: var(--color-accent-subtle);--color-correct: var(--color-success);--color-correct-bg: var(--color-success-subtle);--color-incorrect: var(--color-error);--color-incorrect-bg: var(--color-error-subtle);--font-body: var(--font-sans);--font-size-body: var(--text-base);--font-size-xs: var(--text-xs);--font-size-sm: var(--text-sm);--font-size-lg: var(--text-lg);--font-size-xl: var(--text-xl);--font-size-2xl: var(--text-2xl);--max-width: var(--max-content);--spacing-xs: var(--spacing-1);--spacing-sm: var(--spacing-2);--spacing-md: var(--spacing-4);--spacing-lg: var(--spacing-6);--spacing-xl: var(--spacing-8);--spacing-2xl: var(--spacing-12)}@media(max-width:760px){:root{--gutter: var(--spacing-5);--doc-padding: var(--spacing-5);--header-height: 60px;--max-content: 100%}}@media(max-width:480px){:root{--gutter: var(--spacing-4)}}.doc-surface{background:var(--color-surface);border:var(--doc-border);border-radius:var(--radius-panel);padding:var(--doc-padding)}.doc-surface-quiet{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-panel);padding:var(--doc-padding)}.doc-eyebrow{display:block;font-family:var(--font-mono);font-size:var(--text-2xs);font-weight:var(--font-medium);color:var(--color-ink-tertiary);margin-bottom:var(--spacing-3);text-transform:uppercase;letter-spacing:var(--tracking-meta)}.doc-eyebrow-ink{color:var(--color-ink);border-bottom:var(--doc-rule-soft);padding-bottom:var(--spacing-2);margin-bottom:var(--spacing-4)}.doc-prose,.doc-prose-lg{font-family:var(--font-sans);font-size:var(--text-lg);line-height:var(--lh-doc);color:var(--color-ink);white-space:pre-wrap;max-width:66ch}.doc-item-num{display:inline-flex;align-items:center;justify-content:center;min-width:28px;height:24px;padding:0 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var(--ease-out)}a:hover{color:var(--color-link)}button{cursor:pointer;font-family:inherit;font-size:inherit}textarea,input,select{font-family:inherit;font-size:var(--text-base);color:var(--color-ink);background:var(--color-surface)}select{height:var(--control-h-sm);max-width:100%;padding:0 30px 0 var(--spacing-3);border:1px solid var(--color-border-strong);border-radius:var(--control-radius, var(--radius-full));appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--color-ink-secondary) 50%),linear-gradient(135deg,var(--color-ink-secondary) 50%,transparent 50%);background-position:right 16px center,right 12px center;background-size:4px 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var(--ease-out)}.editorial-link:hover{color:var(--color-link)}:focus-visible{outline:none;box-shadow:var(--focus-ring);border-radius:var(--radius-xs)}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--color-scrollbar);border:2px solid transparent;background-clip:padding-box;border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-scrollbar-hover);background-clip:padding-box}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}.micro-label{font-family:var(--font-mono);font-size:var(--text-2xs);font-weight:var(--font-medium);letter-spacing:var(--tracking-meta);text-transform:uppercase;color:var(--color-ink-tertiary)}.glass{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px 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8px);position:relative;width:calc(var(--control-h-sm) * 1.8);height:var(--control-h-sm);flex-shrink:0;padding:0;border:1px solid var(--color-border-strong);border-radius:var(--radius-full);background:transparent;transition:border-color var(--duration-base) var(--ease-out),background var(--duration-base) var(--ease-out)}._toggle_lwupt_5:hover{border-color:var(--color-ink)}._toggle_lwupt_5:focus-visible{box-shadow:var(--focus-ring)}._knob_lwupt_28{position:absolute;top:3px;left:3px;width:var(--knob);height:var(--knob);border-radius:var(--radius-full);background:var(--color-ink);transition:transform .22s var(--ease-drawer)}[data-theme=dark] ._knob_lwupt_28{transform:translate(calc(var(--control-h-sm) * .8));background:transparent;box-shadow:inset -7px -2px 0 0 var(--color-ink)}@media(prefers-reduced-motion:reduce){._toggle_lwupt_5,._knob_lwupt_28{transition:none}}._btn_47rgi_4{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:var(--control-radius, var(--radius-full));font-weight:var(--font-medium);font-family:var(--font-sans);transition:background var(--duration-fast) var(--ease-out),border-color var(--duration-fast) var(--ease-out),color var(--duration-fast) var(--ease-out),box-shadow var(--duration-fast) var(--ease-out),transform var(--duration-fast) var(--ease-out),opacity var(--duration-fast) 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