/* 进制转换器 - 极简工具风格 */
* { margin: 0; padding: 0; box-sizing: border-box;
} :root { --primary: #1976d2; --primary-hover: #1565c0; --text: #1a1a1a; --text-muted: #666; --border: #e0e0e0; --bg: #f5f5f5; --surface: #fff; --input-bg: #fafafa; --success: #2e7d32; --error: #c62828; --radius: 6px;
} /* 暗色主题 */
body.dark-theme { --primary: #42a5f5; --primary-hover: #64b5f6; --text: #e8e8e8; --text-muted: #b0b0b0; --border: #404040; --bg: #1a1a1a; --surface: #252525; --input-bg: #2d2d2d; --error: #ef5350;
} .theme-icon { display: inline-flex; align-items: center; justify-content: center;
}
body.dark-theme .theme-icon.sun { display: none; }
body.dark-theme .theme-icon.moon { display: inline-flex; }
body .theme-icon.sun { display: inline-flex; }
body .theme-icon.moon { display: none; } body { font-family: system-ui, -apple-system, Segoe UI, sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; min-height: 100vh; -webkit-font-smoothing: antialiased; transition: background-color 0.2s ease, color 0.2s ease;
} .container { max-width: 960px; margin: 0 auto; padding: 24px 20px; width: 100%;
} /* 头部：克制、工具感 */
header { margin-bottom: 24px; position: relative; display: flex; align-items: center;
} .theme-toggle { position: fixed; right: 12px; top: 12px; z-index: 100; width: 36px; height: 36px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); color: var(--text-muted); cursor: pointer; font-size: 1rem; line-height: 1; display: flex; align-items: center; justify-content: center; transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
} .theme-toggle:hover { color: var(--text); background: var(--input-bg);
} .header-content { display: flex; align-items: center; gap: 12px;
} .logo { width: 40px; height: 40px; flex-shrink: 0; opacity: 0.9;
} .header-text { display: flex; flex-direction: column; gap: 2px;
} header h1 { font-size: 1.25rem; font-weight: 600; color: var(--text);
} .subtitle { font-size: 0.8125rem; color: var(--text-muted);
} /* 主区域：扁平、细边框 */
main { background: var(--surface); border-radius: var(--radius); padding: 28px 32px; border: 1px solid var(--border); transition: background-color 0.2s ease, border-color 0.2s ease;
} .converter-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px 32px; margin-bottom: 24px;
} .input-group { display: flex; flex-direction: column;
} .input-group label { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-weight: 500;
} .label-title { font-size: 0.875rem; color: var(--text);
} .label-hint { font-size: 0.75rem; color: var(--text-muted);
} .input-group input { width: 100%; padding: 10px 12px; font-size: 0.9375rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--input-bg); color: var(--text); transition: border-color 0.15s ease, background-color 0.2s ease, color 0.2s ease; font-family: ui-monospace, 'Cascadia Code', Consolas, monospace;
} .input-group input:focus { outline: none; border-color: var(--primary);
} .input-group input::placeholder { color: #999;
} .input-group input.error { border-color: var(--error); background: #ffebee;
} .input-group input.success { border-color: var(--success);
} .error-message { min-height: 18px; font-size: 0.75rem; color: var(--error); margin-top: 4px;
} /* 按钮 */
.button-group { display: flex; gap: 10px; justify-content: center; margin-bottom: 28px;
} .btn { padding: 8px 20px; font-size: 0.875rem; font-weight: 500; border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; background: var(--surface); color: var(--text); transition: background-color 0.15s ease, border-color 0.15s ease;
} .btn:hover { background: var(--input-bg);
} .btn-primary { background: var(--primary); color: #fff; border-color: var(--primary);
} .btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover);
} /* 说明区域：文档式 */
.info-section { background: var(--input-bg); border-radius: var(--radius); padding: 16px 18px; border: 1px solid var(--border);
} .info-section h3 { font-size: 0.875rem; font-weight: 600; margin-bottom: 10px; color: var(--text);
} .info-section ul { list-style: none; padding-left: 0;
} .info-section ul li { padding: 4px 0; color: var(--text-muted); font-size: 0.8125rem; position: relative; padding-left: 1rem;
} .info-section ul li::before { content: "·"; position: absolute; left: 0; color: var(--primary);
} .steps-section, .examples-section, .faq-section { margin-top: 20px;
} .steps-section h3, .examples-section h3, .faq-section h3 { font-size: 0.8125rem; font-weight: 600; margin-bottom: 8px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.03em;
} .steps-list { margin: 0; padding-left: 1.2rem; color: var(--text); font-size: 0.8125rem; line-height: 1.6;
} .steps-list li { margin-bottom: 4px; } .examples-grid { display: grid; gap: 8px; } .example-item { background: var(--input-bg); border-radius: var(--radius); padding: 10px 12px; border: 1px solid var(--border);
} .example-title { font-weight: 500; font-size: 0.8125rem; color: var(--text); margin-bottom: 4px;
} .example-expr { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 2px;
} .example-result { font-size: 0.75rem; color: var(--primary); font-weight: 500;
} .faq-list { display: grid; gap: 8px; } .faq-item { background: var(--input-bg); border-radius: var(--radius); padding: 10px 12px; border: 1px solid var(--border);
} .faq-q { font-weight: 500; font-size: 0.8125rem; color: var(--text); margin-bottom: 4px;
} .faq-a { font-size: 0.75rem; color: var(--text-muted); line-height: 1.5;
} /* 页脚 */
footer { text-align: center; margin-top: 28px; font-size: 0.75rem; color: var(--text-muted);
} footer a { color: var(--text-muted); text-decoration: none;
} footer a:hover { color: var(--text); } .footer-sep { margin: 0 6px; color: var(--border); } /* Toast */
.toast { position: fixed; bottom: 20px; right: 20px; padding: 10px 16px; border-radius: var(--radius); font-size: 0.875rem; background: var(--text); color: #fff; opacity: 0; transform: translateY(8px); transition: opacity 0.2s ease, transform 0.2s ease; pointer-events: none; z-index: 1000;
} .toast.show { opacity: 1; transform: translateY(0);
} .toast.success { background: var(--success); color: #fff; } .toast.error { background: var(--error); color: #fff; } @media (max-width: 768px) { .container { padding: 16px 12px; } main { padding: 18px; } .converter-grid { grid-template-columns: 1fr; gap: 16px; } .button-group { flex-direction: row; flex-wrap: wrap; justify-content: center; } .btn { flex: 1; min-width: 120px; }
} @media (max-width: 480px) { .header-content { gap: 8px; } .logo { width: 32px; height: 32px; } header h1 { font-size: 1.1rem; } .subtitle { font-size: 0.75rem; } .input-group input { padding: 8px 10px; font-size: 0.875rem; }
}