*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}:root{--primary-50: #f0f9ff;--primary-100: #e0f2fe;--primary-500: #0ea5e9;--primary-600: #0284c7;--primary-700: #0369a1;--paper-color: #ffffff;--bg-primary: #f8fafc;--bg-secondary: #f1f5f9;--bg-tertiary: #e2e8f0;--ink-color: #1e293b;--text-secondary: #64748b;--text-tertiary: #94a3b8;--border-color: #e2e8f0;--accent-color: #0ea5e9;--accent-light: #e0f2fe;--success-color: #10b981;--success-light: #d1fae5;--warning-color: #f59e0b;--warning-light: #fef3c7;--danger-color: #dc2626;--danger-light: #fee2e2;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .1);--radius-lg: 16px;--radius-md: 12px;--radius-sm: 8px;--font-serif: "Georgia", "Times New Roman", serif;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica", "Arial", sans-serif;--highlight-bg: #fef9c3;--highlight-border: #fde047;--vocab-highlight-bg: rgba(14, 165, 233, .15);--vocab-highlight-border: rgba(14, 165, 233, .3);--jump-highlight-bg: rgba(251, 191, 36, .4);--toast-success-bg: #ecfdf5;--toast-success-border: #a7f3d0;--toast-error-bg: #fef2f2;--toast-error-border: #fecaca;--popup-bg: #ffffff;--overlay-bg: rgba(0, 0, 0, .5);--tooltip-bg: #1e293b;--tooltip-text: #ffffff}[data-theme=dark]{--primary-50: #0c4a6e;--primary-100: #075985;--primary-500: #38bdf8;--primary-600: #0ea5e9;--primary-700: #0284c7;--paper-color: #1e293b;--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--ink-color: #f1f5f9;--text-secondary: #94a3b8;--text-tertiary: #64748b;--border-color: #334155;--accent-color: #38bdf8;--accent-light: #0c4a6e;--success-color: #34d399;--success-light: #064e3b;--warning-color: #fbbf24;--warning-light: #78350f;--danger-color: #f87171;--danger-light: #7f1d1d;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .4);--shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, .5);--highlight-bg: #422006;--highlight-border: #a16207;--vocab-highlight-bg: rgba(56, 189, 248, .2);--vocab-highlight-border: rgba(56, 189, 248, .4);--jump-highlight-bg: rgba(251, 191, 36, .3);--toast-success-bg: #064e3b;--toast-success-border: #059669;--toast-error-bg: #7f1d1d;--toast-error-border: #dc2626;--popup-bg: #1e293b;--overlay-bg: rgba(0, 0, 0, .7);--tooltip-bg: #334155;--tooltip-text: #f1f5f9}[data-theme=dark] ::-webkit-scrollbar-thumb{background:#fff3}[data-theme=dark] ::-webkit-scrollbar-thumb:hover{background:#ffffff4d}body{margin:0;padding:0;font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--ink-color);overflow:hidden;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#0003;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#0006}.btn{background:var(--paper-color);border:1px solid var(--border-color);padding:10px 20px;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);cursor:pointer;font-weight:500;font-size:14px;transition:all .2s ease;color:var(--ink-color);display:inline-flex;align-items:center;gap:8px;font-family:var(--font-sans)}.btn:hover{border-color:var(--accent-color);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn-primary{background:var(--accent-color);color:#fff;border-color:var(--accent-color)}.btn-primary:hover{background:var(--primary-600);border-color:var(--primary-600)}.btn-logout{background:var(--paper-color);color:var(--text-secondary);border-color:var(--border-color)}.btn-logout:hover{background:var(--danger-light);color:var(--danger-color);border-color:var(--danger-color)}.btn-danger{background:var(--danger-color);color:#fff;border-color:var(--danger-color)}.btn-danger:hover{background:#b91c1c;border-color:#b91c1c}.modal-overlay{position:fixed;inset:0;background:var(--overlay-bg);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;justify-content:center;align-items:center;z-index:1000;animation:fadeIn .3s ease}.modal-content{background:var(--popup-bg);padding:32px;border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);width:90%;max-width:600px;max-height:80vh;overflow-y:auto;animation:slideUp .3s ease;border:1px solid var(--border-color)}.toast{background:var(--toast-success-bg);border:1px solid var(--toast-success-border);color:var(--success-color)}.toast-error{background:var(--toast-error-bg);border:1px solid var(--toast-error-border);color:var(--danger-color)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}