*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #2F6BFF;--primary-light: #EBF0FF;--bg: #F5F7FA;--card: #FFFFFF;--text: #1A1A2E;--text-secondary: #6B7280;--border: #E5E7EB;--radius: 12px;--danger: #EF4444;--success: #10B981}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Helvetica Neue,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app{max-width:480px;margin:0 auto;min-height:100vh}.loading-screen,.error-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:16px}.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--card);border-bottom:1px solid var(--border)}.header 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