:root {
    /* 页面背景色 */
    --bg-body: #0f172a;
    /* 卡片背景色 */
    --bg-card: #1e293b;
    /* 输入框背景色 */
    --bg-input: #0f172a;
    /* 次级背景色 */
    --bg-secondary: #1e293b;
    /* 主要文字颜色 */
    --text-primary: #f1f5f9;
    /* 次要文字颜色 */
    --text-secondary: #94a3b8;
    /* 标签文字颜色 */
    --text-label: #cbd5e1;
    /* 边框颜色 */
    --border-color: #334155;
    /* 输入框边框颜色 */
    --border-input: #475569;
    /* 主题强调色 */
    --accent-color: #38bdf8;
    /* 主题强调色悬停态 */
    --accent-hover: #0ea5e9;
    /* 阴影样式 */
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    /* 网格线颜色 */
    --grid-color: #334155;
    /* 提示框背景色 */
    --tooltip-bg: rgba(30,41,59,0.95);
    /* 提示框文字颜色 */
    --tooltip-text: #f1f5f9;
    /* 下拉箭头颜色 */
    --select-arrow: '%2394a3b8';
    /* 峰值徽章背景色 */
    --badge-peak-bg: rgba(56,189,248,0.15);
    /* 峰值徽章文字颜色 */
    --badge-peak-text: #38bdf8;
    /* 高速徽章背景色 */
    --badge-high-bg: rgba(168,85,247,0.15);
    /* 高速徽章文字颜色 */
    --badge-high-text: #a855f7;
    /* 中速徽章背景色 */
    --badge-medium-bg: rgba(234,179,8,0.15);
    /* 中速徽章文字颜色 */
    --badge-medium-text: #eab308;
    /* 低速徽章背景色 */
    --badge-low-bg: rgba(239,68,68,0.15);
    /* 低速徽章文字颜色 */
    --badge-low-text: #ef4444;
    /* 图表功率曲线颜色 */
    --chart-power: #7dd3fc;
    /* 图表功率曲线填充色 */
    --chart-power-bg: rgba(96,208,255,0.15);
    /* 图表SOC曲线颜色 */
    --chart-soc: #fbbf24;
    /* 图表网格线颜色 */
    --chart-grid: rgba(255,255,255,0.05);
    /* 图表文字颜色 */
    --chart-text: #ffffff;
    /* 图表提示框背景色 */
    --chart-tooltip-bg: rgba(30,41,59,0.95);
    /* 图表提示框文字颜色 */
    --chart-tooltip-text: #f1f5f9;
    /* 图表提示框边框颜色 */
    --chart-tooltip-border: rgba(56,189,248,0.3);
}

[data-theme="light"] {
    --bg-body: #f5f7fa;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --bg-secondary: #f8fafc;
    --text-primary: #1a1a2e;
    --text-secondary: #666666;
    --text-label: #555555;
    --border-color: #e8ecf1;
    --border-input: #d0d7de;
    --accent-color: #0066cc;
    --accent-hover: #0052a3;
    --shadow: 0 1px 3px rgba(0,0,0,0.04);
    --grid-color: #e8ecf1;
    --tooltip-bg: rgba(255,255,255,0.95);
    --tooltip-text: #333333;
    --select-arrow: '%23666';
    --badge-peak-bg: #e6f0fa;
    --badge-peak-text: #0066cc;
    --badge-high-bg: #f0e6fa;
    --badge-high-text: #7b2cbf;
    --badge-medium-bg: #fef9e6;
    --badge-medium-text: #b38600;
    --badge-low-bg: #fde8e8;
    --badge-low-text: #c53030;
    --chart-power: #0066cc;
    --chart-power-bg: rgba(0,102,204,0.1);
    --chart-soc: #d97706;
    --chart-grid: rgba(0,0,0,0.05);
    --chart-text: #666666;
    --chart-tooltip-bg: rgba(255,255,255,0.95);
    --chart-tooltip-text: #333333;
    --chart-tooltip-border: rgba(0,0,0,0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-body);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
    transition: background 0.3s, color 0.3s;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
}
.header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}
.header h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 10px;
    font-weight: 700;
}
.header h1 i {
    color: var(--accent-color);
    margin-right: 10px;
}
.header p {
    color: var(--text-secondary);
    font-size: 1rem;
}
.theme-toggle {
    position: absolute;
    right: 0;
    top: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    padding: 0;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}
.theme-toggle:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}
html[data-theme="light"] .theme-toggle {
    color: #fbbf24;
}
html[data-theme="light"] .theme-toggle:hover {
    border-color: #fbbf24;
    color: #f59e0b;
}
.main-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 20px;
}
.card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    transition: background 0.3s, border-color 0.3s;
}
.card-title {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}
.card-title i {
    color: var(--accent-color);
}
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-label);
    font-size: 0.875rem;
    font-weight: 500;
}
.form-group input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-input);
    border-radius: 8px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.2s;
}
.form-group input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0,102,204,0.1);
}
.form-group select {
    width: 100%;
    padding: 10px 36px 10px 14px;
    border: 1px solid var(--border-input);
    border-radius: 8px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all 0.2s;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='var(--select-arrow)' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0,102,204,0.1);
}
.form-group select option {
    background: var(--bg-card);
    color: var(--text-primary);
    padding: 8px;
}
.form-group select optgroup {
    background: var(--bg-card);
    color: var(--accent-color);
    font-weight: 600;
}
.range-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
}
.btn-calculate {
    width: 100%;
    padding: 12px;
    background: var(--accent-color);
    border: none;
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-calculate:hover {
    background: var(--accent-hover);
}
.result-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}
@media (max-width: 1200px) {
    .result-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}
.result-item {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 18px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: background 0.3s, border-color 0.3s;
}
.result-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-color);
}
.result-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 4px;
}
.chart-container {
    position: relative;
    height: 320px;
    margin-top: 16px;
}
.stages-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
    font-size: 0.9rem;
}
.stages-table th,
.stages-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.stages-table th {
    color: var(--text-primary);
    font-weight: 600;
    background: var(--bg-secondary);
}
.stages-table tr:hover {
    background: var(--bg-secondary);
}
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-peak {
    background: var(--badge-peak-bg);
    color: var(--badge-peak-text);
}
.badge-high {
    background: var(--badge-high-bg);
    color: var(--badge-high-text);
}
.badge-medium {
    background: var(--badge-medium-bg);
    color: var(--badge-medium-text);
}
.badge-low {
    background: var(--badge-low-bg);
    color: var(--badge-low-text);
}
.tech-specs {
    margin-top: 20px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: background 0.3s, border-color 0.3s;
}
.tech-specs h3 {
    color: var(--text-primary);
    margin-bottom: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}
.tech-specs h3 i {
    color: var(--accent-color);
}
.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
    font-size: 0.85rem;
}
.spec-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid var(--border-color);
}
.spec-item:last-child {
    border-bottom: none;
}
.spec-label {
    color: var(--text-secondary);
}
.spec-value {
    color: var(--text-primary);
    font-weight: 500;
}
.calc-params {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 16px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: background 0.3s, border-color 0.3s;
}
.params-title {
    color: var(--text-primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.params-title::before {
    font-family: 'Font Awesome 7 Free';
    font-weight: 900;
    content: '\f013';
    color: var(--accent-color);
}
.calc-timestamp {
    margin-left: auto;
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 400;
}
.params-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.params-row {
    display: flex;
    gap: 10px;
}

.params-row:first-child .param-item:first-child {
    flex: 0 0 70%;
}

.params-row:first-child .param-item:last-child {
    flex: 0 0 calc(30% - 10px);
}

.params-row:last-child .param-item {
    flex: 1 1 0;
}
.param-item {
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 8px 10px;
    background: var(--bg-card);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: background 0.3s, border-color 0.3s;
}
.param-label {
    color: var(--text-secondary);
    font-size: 0.75rem;
}
.param-value {
    color: var(--text-primary);
    font-size: 0.92rem;
    font-weight: 600;
}
@media (max-width: 1200px) {
    .params-row {
        flex-direction: column;
    }
    .params-row .param-item:first-child,
    .params-row .param-item:last-child {
        flex: 1 1 auto;
    }
}
@media (max-width: 600px) {
    .params-row {
        flex-direction: column;
    }
}
.notes-content {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.7;
}

.notes-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.notes-content li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 8px;
}

.notes-content li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-color);
}

.notes-content li:last-child {
    margin-bottom: 0;
}

@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    .result-grid {
        grid-template-columns: 1fr;
    }
    .theme-toggle {
        position: static;
        margin: 0 auto 16px;
        width: fit-content;
    }
}