#app {
            --bg: #f4f6fb;
            --card-bg: #ffffff;
            --primary: #2563eb;
            --primary-hover: #1d4ed8;
            --primary-light: rgba(37, 99, 235, 0.10);
            --text: #1e293b;
            --text-secondary: #64748b;
            --border: #e5e5e7;
            --success: #10b981;
            --success-bg: #ecfdf5;
            --danger: #ef4444;
            --danger-bg: #fef2f2;
            --warning: #f59e0b;
            --warning-bg: #fffbeb;
            --radius: 12px;
            --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
            --shadow-lg: 0 4px 6px rgba(0,0,0,0.05), 0 10px 30px rgba(0,0,0,0.08);
            --transition: 0.2s ease;
        }
#app * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
#app {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            background: var(--bg);
            color: var(--text);
            min-height: 100vh;
            padding: 20px;
            line-height: 1.6;
        }
#app .container {
            max-width: 1000px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 18px;
        }
#app .header {
            text-align: center;
            padding: 12px 10px 4px;
        }
#app .header h1 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
#app .header h1 svg { width: 28px; height: 28px; color: var(--primary); }
#app .header p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            max-width: 720px;
            margin: 0 auto;
        }
#app .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            margin-top: 10px;
        }
#app .card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 20px;
            border: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
#app .card:hover { box-shadow: var(--shadow-lg); }
#app .card-title {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text);
        }
#app .card-title svg { color: var(--primary); margin-right: 2px; vertical-align: -3px; }

/* 按钮 */
#app .btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 9px 18px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 500;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
            user-select: none;
        }
#app .btn:active { transform: scale(0.97); }
#app .btn svg { margin-right: 2px; }
#app .btn-primary { background: var(--primary); color: #fff; }
#app .btn-primary:hover { background: var(--primary-hover); box-shadow: 0 4px 12px rgba(37,99,235,0.3); }
#app .btn-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
#app .btn-outline:hover { background: var(--primary-light); }
#app .btn:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }
#app .toolbar-row {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            margin-top: 16px;
        }

/* 表单 */
#app .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
#app .field {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
#app .field label {
            font-size: 0.85rem;
            color: var(--text-secondary);
            font-weight: 500;
        }
#app .hint {
            font-size: 0.72rem;
            color: #94a3b8;
        }
#app .text-input {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 10px;
            font-size: 0.95rem;
            background: #fff;
            color: var(--text);
            transition: border-color .2s, box-shadow .2s;
        }
#app .text-input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37,99,235,.12);
            outline: none;
        }
#app .radio-row {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }
#app .radio {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
            color: var(--text);
            cursor: pointer;
        }
#app .radio input { accent-color: var(--primary); }

/* 分段控件 */
#app .seg {
            display: inline-flex;
            background: #eef1f5;
            border-radius: 10px;
            padding: 4px;
            gap: 4px;
            flex-wrap: wrap;
        }
#app .seg button {
            border: none;
            background: transparent;
            color: var(--text-secondary);
            font-size: 0.88rem;
            padding: 8px 14px;
            border-radius: 8px;
            cursor: pointer;
            transition: all var(--transition);
            font-family: inherit;
        }
#app .seg button.active {
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
        }

/* 结果 hero */
#app .result-hero {
            background: linear-gradient(135deg, #2563eb, #7c3aed);
            border: none;
            color: #fff;
            text-align: center;
        }
#app .hero-label { font-size: 0.9rem; opacity: 0.9; }
#app .hero-value {
            font-size: 3.0rem;
            font-weight: 800;
            line-height: 1.1;
            margin: 6px 0 2px;
        }
#app .hero-value .unit { font-size: 1.3rem; font-weight: 600; opacity: 0.85; margin-left: 4px; }
#app .hero-range {
            font-size: 1rem;
            opacity: 0.95;
            background: rgba(255,255,255,0.16);
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            margin-top: 4px;
        }
#app .hero-sub {
            font-size: 0.85rem;
            opacity: 0.9;
            margin-top: 12px;
            line-height: 1.7;
        }
#app .hero-sub b { color: #fff; }

/* 结果指标网格 */
#app .result-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 12px;
        }
#app .metric {
            background: #f8fafc;
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 14px;
        }
#app .metric-label {
            font-size: 0.82rem;
            color: var(--text-secondary);
            font-weight: 500;
        }
#app .metric-value {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            margin: 6px 0 4px;
        }
#app .metric-value .unit { font-size: 0.85rem; font-weight: 500; color: var(--text-secondary); margin-left: 3px; }
#app .metric-sub { font-size: 0.74rem; color: var(--text-secondary); line-height: 1.6; }
#app .metric.highlight {
            background: var(--primary-light);
            border-color: rgba(37,99,235,0.25);
        }
#app .metric.highlight .metric-value { color: var(--primary); }

/* 提示框 */
#app .tip-box {
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            padding: 10px 14px;
            border-radius: 0 8px 8px 0;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }
#app .tip-box strong { color: var(--primary); }
#app .tip-box.warn { background: var(--warning-bg); border-left-color: var(--warning); }
#app .tip-box.warn strong { color: #b45309; }

#app svg { vertical-align: -0.15em; }

@media (max-width: 640px) {
    #app .grid-2 { grid-template-columns: 1fr; }
    #app .hero-value { font-size: 2.4rem; }
    #app .header h1 { font-size: 1.4rem; }
}