*{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f5f5f7;--surface: #ffffff;--surface-hover: #f0f0f2;--text: #1d1d1f;--text-secondary: #555;--text-tertiary: #888;--border: #d2d2d7;--accent: #0066cc;--accent-hover: #0055aa;--accent-bg: #e8f0fe;--error: #d93025;--error-bg: #fce8e6;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .04);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .1);--radius: 12px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}[data-theme=dark]{--bg: #0d0d0d;--surface: #1a1a1a;--surface-hover: #242424;--text: #f0f0f0;--text-secondary: #aaa;--text-tertiary: #777;--border: #333;--accent: #4d9fff;--accent-hover: #6db3ff;--accent-bg: rgba(77, 159, 255, .12);--error: #f87171;--error-bg: rgba(248, 113, 113, .1);--shadow: 0 1px 3px rgba(0, 0, 0, .3);--shadow-lg: 0 4px 12px rgba(0, 0, 0, .4);color-scheme:dark}html{font-size:16px}body{font-family:var(--font);background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}.App{max-width:720px;margin:0 auto;padding:0 20px 60px}.error-message{text-align:center;margin:20px 0;padding:12px 20px;font-size:.9rem;color:var(--error);background:var(--error-bg);border:1px solid rgba(220,53,69,.15);border-radius:var(--radius)}::selection{background-color:var(--accent-bg);color:var(--accent)}@media screen and (max-width:480px){.App{padding:0 16px 40px}}.error-boundary{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:60vh;text-align:center;padding:20px}.error-boundary h2{font-size:1.5rem;font-weight:700;color:var(--text);margin:0 0 8px}.error-boundary p{font-size:.95rem;color:var(--text-secondary);margin:0 0 24px}.error-boundary-btn{display:block;padding:10px 28px;font-size:.9rem;font-family:var(--font);border:1.5px solid var(--border);border-radius:30px;background:var(--surface);color:var(--text);cursor:pointer;transition:all .15s}.error-boundary-btn:hover{background:var(--accent-bg);border-color:var(--accent);color:var(--accent)}.spinner-container{display:flex;flex-direction:column;align-items:center;gap:10px;margin:40px auto}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.spinner-text{font-size:.85rem;color:var(--text-tertiary)}.scroll-top{position:fixed;bottom:24px;right:24px;width:40px;height:40px;padding:8px;border:1px solid var(--border);border-radius:50%;background:var(--surface);color:var(--text-secondary);cursor:pointer;box-shadow:var(--shadow-lg);transition:all .2s;z-index:100;animation:fade-in .2s ease}.scroll-top:hover{background:var(--accent-bg);border-color:var(--accent);color:var(--accent)}.scroll-top svg{width:100%;height:100%}@keyframes fade-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@media screen and (max-width:480px){.scroll-top{bottom:16px;right:16px;width:36px;height:36px}}