:root{--color-primary: #2563eb;--color-primary-dark: #1d4ed8;--color-primary-light: #dbeafe;--color-accent: #0ea5e9;--color-success: #16a34a;--color-error: #dc2626;--color-warning: #d97706;--color-info: #0284c7;--color-bg: #ffffff;--color-bg-subtle: #f8fafc;--color-bg-muted: #f1f5f9;--color-border: #e2e8f0;--color-border-strong: #cbd5e1;--color-text: #0f172a;--color-text-muted: #475569;--color-text-subtle: #94a3b8;--color-text-inverse: #ffffff;--color-code-bg: #0f172a;--color-code-text: #e2e8f0;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, monospace;--font-zh: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--font-ja: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;--font-ko: "Noto Sans KR", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;--font-ar: "Noto Naskh Arabic", "Noto Sans Arabic", "Segoe UI", sans-serif;--font-fa: "Vazirmatn", "Noto Naskh Arabic", 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var(--space-6);border-radius:var(--radius-md);font-size:var(--text-base);font-weight:600;line-height:1;transition:background .15s,transform .1s,box-shadow .15s;cursor:pointer;border:2px solid transparent;text-decoration:none!important}.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn-primary{background:var(--color-primary);color:var(--color-text-inverse)}.btn-primary:hover{background:var(--color-primary-dark);box-shadow:var(--shadow-md)}.btn-outline{background:transparent;color:var(--color-primary);border-color:var(--color-primary)}.btn-outline:hover{background:var(--color-primary-light)}.btn-ghost{background:transparent;color:var(--color-text-muted);border-color:var(--color-border)}.btn-ghost:hover{background:var(--color-bg-muted);color:var(--color-text)}.btn-sm{padding:var(--space-2) var(--space-4);font-size:var(--text-sm)}.btn-lg{padding:var(--space-4) var(--space-8);font-size:var(--text-lg)}.card{background:var(--color-bg);border:1px solid 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solid var(--color-border)}.table-wrap table{min-width:480px;width:100%;border-collapse:collapse}.table-wrap th,.table-wrap td{padding:var(--space-3) var(--space-4);text-align:start;font-size:var(--text-sm);border-bottom:1px solid var(--color-border)}.table-wrap th{font-weight:600;background:var(--color-bg-subtle);color:var(--color-text-muted);text-transform:uppercase;font-size:var(--text-xs);letter-spacing:.05em;text-align:start}.study-first-hint{font-size:var(--text-sm);color:var(--color-text-muted);margin-top:calc(-1 * var(--space-3));margin-bottom:var(--space-6)}.study-first-hint a{color:var(--color-primary);text-decoration:underline}.section-header{text-align:center;margin-bottom:var(--space-12)}.section-header p{margin-top:var(--space-4);font-size:var(--text-lg);color:var(--color-text-muted);max-width:56ch;margin-inline:auto}.breadcrumb{display:flex;flex-wrap:wrap;gap:var(--space-1);align-items:center;font-size:var(--text-sm);color:var(--color-text-muted);margin-bottom:var(--space-6)}.breadcrumb a{color:var(--color-primary)}.breadcrumb a:hover{text-decoration:underline}.breadcrumb-sep{color:var(--color-text-subtle)}.divider{border:none;border-top:1px solid var(--color-border);margin-block:var(--space-8)}[dir=rtl] 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#94a3b8;--color-text-inverse: #ffffff;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", Consolas, monospace;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-4xl: 2.25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--radius-md: .5rem;--radius-lg: .75rem;--max-w-content: 1200px;--shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05)}[data-theme=dark]{--color-bg: #0f172a;--color-bg-subtle: #1e293b;--color-bg-muted: #1e293b;--color-border: #334155;--color-text: #f1f5f9;--color-text-muted: #94a3b8;--color-text-subtle: #64748b}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:1.625;color:var(--color-text);background:var(--color-bg);min-height:100vh;display:flex;flex-direction:column}.skip-link{position:absolute;top:-100%;inset-inline-start:var(--space-4);z-index:1000;background:var(--color-primary);color:var(--color-text-inverse);padding:var(--space-2) var(--space-4);border-radius:var(--radius-md);font-weight:600;text-decoration:none}.skip-link:focus{top:var(--space-4)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.container{max-width:var(--max-w-content);margin-inline:auto;padding-inline:var(--space-6)}.ex-nav-strip{position:fixed;bottom:0;inset-inline:0;background:var(--color-bg);border-top:1px solid var(--color-border);z-index:50;padding:var(--space-3) 0}.ex-nav-inner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4)}.ex-nav-btn{display:inline-flex;align-items:center;gap:.4em;font-size:var(--text-sm);font-weight:600;color:var(--color-primary);text-decoration:none;padding:var(--space-2) var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface);transition:background .15s,border-color .15s;white-space:nowrap;max-width:38%;overflow:hidden;text-overflow:ellipsis}.ex-nav-btn:hover{background:var(--color-primary-light);border-color:var(--color-primary)}.ex-nav-pos{font-size:var(--text-xs);color:var(--color-text-subtle);font-family:var(--font-mono);white-space:nowrap;flex-shrink:0}body:has(#ex-nav-strip:not([hidden])) main{padding-bottom:4rem}.copy-passage-btn{display:inline-flex;align-items:center;gap:4px;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-bg, 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