*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--c-bg: #ffffff;--c-surface: #ffffff;--c-surface-alt: #f8f9fa;--c-text: #222222;--c-text-sec: #45515e;--c-text-muted: #8e8e93;--c-brand: #1456f0;--c-primary: #3b82f6;--c-primary-hover:#2563eb;--c-primary-light:#60a5fa;--c-primary-200: #bfdbfe;--c-dark: #181e25;--c-border: #e5e7eb;--c-border-light: #f2f3f5;--c-amber: #f59e0b;--c-green: #10b981;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06);--shadow-md: 0 4px 6px rgba(0, 0, 0, .08);--shadow-brand: 0 0 15px rgba(44, 30, 116, .16);--shadow-lg: 0 12px 16px -4px rgba(36, 36, 36, .08);--font-display: "Outfit", "Helvetica Neue", sans-serif;--font-body: "DM Sans", "Helvetica Neue", sans-serif;--font-cn: system-ui, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--max-w: 640px;--gap: 16px;--r-sm: 8px;--r-md: 13px;--r-lg: 20px;--r-pill: 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a:hover{text-decoration:underline}.lang-toggle{position:fixed;top:16px;right:16px;z-index:100;padding:6px 16px;border:1px solid var(--c-border);border-radius:var(--r-pill);background:var(--c-surface);color:var(--c-text-sec);font:500 .8rem var(--font-body);cursor:pointer;box-shadow:var(--shadow-sm);transition:background .2s,color .2s}.lang-toggle:hover{background:var(--c-primary);color:#fff;border-color:var(--c-primary)}.quiz-container{max-width:var(--max-w);margin:0 auto;padding:var(--gap);min-height:100dvh;display:flex;flex-direction:column}.quiz-header{padding:16px 0;position:sticky;top:0;background:var(--c-bg);z-index:10}.quiz-progress-wrap{display:flex;align-items:center;gap:12px}.quiz-progress-bar{flex:1;height:6px;background:var(--c-border);border-radius:var(--r-pill);overflow:hidden}.quiz-progress-fill{height:100%;width:0%;background:var(--c-primary);border-radius:var(--r-pill);transition:width .3s 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