:root {
    /* 全局护眼绿配色方案 */
    --bg-dark: #c7edcc;
    /* 最底层背景：经典护眼绿 */
    --bg-panel: #d5f5d9;
    /* 面板背景：稍浅一点的绿，用来区分层级 */
    --bg-input: #e8fceb;
    /* 输入框/按钮背景：最浅的绿偏白，保证输入清晰 */

    --text-main: #2d4a31;
    /* 主文字：深墨绿色，对比度高且不刺眼 */
    --text-muted: #5e8264;
    /* 次要文字：中等深绿色 */

    --accent-cyan: #00796b;
    /* 强调色(青)：调整为深青色以适配浅色背景 */
    --accent-magenta: #d81b60;
    /* 串联元件颜色 */
    --accent-green: #00695c;
    /* 并联元件颜色 */
    --danger: #d32f2f;
    --border-color: #a4cfa9;
    /* 边框颜色：柔和的绿灰 */
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    display: flex;
    margin: 0;
    padding: 0;
    background-color: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
}

#sidebar {
    width: 360px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
    overflow-y: auto;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, rgba(0, 121, 107, 0.05) 0%, transparent 100%);
}

.sidebar-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
    color: var(--accent-cyan);
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

h3 {
    font-size: 13px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 0 0 12px 0;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

.input-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-size: 13px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 6px;
}

input[type="number"] {
    width: 65px;
    padding: 6px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    border-radius: 4px;
    font-family: 'Consolas', monospace;
    text-align: right;
    outline: none;
    transition: 0.2s;
}

input[type="number"]:focus {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 5px rgba(0, 121, 107, 0.3);
    background: #ffffff;
}

.btn-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.tool-btn {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.tool-btn svg {
    width: 40px;
    height: 40px;
    stroke: var(--text-main);
    fill: none;
    stroke-width: 2;
    transition: 0.2s;
}

.tool-btn span {
    font-size: 12px;
    font-weight: 500;
}

.tool-btn:hover {
    background: #d5f5d9;
    border-color: var(--accent-cyan);
}

.tool-btn.active {
    background: rgba(0, 121, 107, 0.1);
    border-color: var(--accent-cyan);
    box-shadow: 0 0 12px rgba(0, 121, 107, 0.2);
}

.tool-btn.active svg {
    stroke: var(--accent-cyan);
}

.s-param-box {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--accent-cyan);
    padding: 12px;
    border-radius: 6px;
    font-family: 'Consolas', monospace;
    color: var(--accent-cyan);
    font-size: 13px;
    line-height: 1.6;
}

.warn-text {
    color: var(--accent-cyan);
    font-size: 12px;
    display: none;
    margin-top: 8px;
    text-align: center;
    background: rgba(0, 121, 107, 0.1);
    padding: 6px;
    border-radius: 4px;
}

.component-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.component-item {
    background: var(--bg-input);
    padding: 8px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-size: 13px;
}

.comp-type {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 80px;
    font-weight: bold;
}

.comp-type.series {
    color: var(--accent-magenta);
}

.comp-type.shunt {
    color: var(--accent-green);
}

.remove-btn {
    background: transparent;
    color: var(--text-muted);
    border: none;
    cursor: pointer;
    font-size: 16px;
    padding: 0 5px;
    transition: 0.2s;
}

.remove-btn:hover {
    color: var(--danger);
}

#main {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    position: relative;
    overflow-y: auto;
    height: 100vh;
}

.content-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    width: 100%;
    max-width: 900px;
}

.canvas-container {
    background: var(--bg-panel);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas#smithCanvas {
    cursor: crosshair;
}

.chart-wrapper {
    width: 100%;
    height: 260px;
    background: var(--bg-panel);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    flex-shrink: 0;
}

#tooltip {
    position: absolute;
    background: rgba(213, 245, 217, 0.95);
    backdrop-filter: blur(4px);
    color: var(--text-main);
    padding: 10px 15px;
    border-radius: 8px;
    font-family: 'Consolas', monospace;
    font-size: 12px;
    pointer-events: none;
    display: none;
    white-space: pre;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 20;
    line-height: 1.5;
}

.tooltip-val {
    color: var(--accent-cyan);
    font-weight: bold;
}

/* --- 历史记录弹窗样式 --- */
.history-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(2px);
}

.history-modal-content {
    background: var(--bg-panel);
    width: 650px;
    max-width: 90%;
    max-height: 90%;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.history-modal-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-dark);
}

.history-modal-header h3 {
    margin: 0;
    color: var(--text-main);
    font-size: 18px;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-main);
    line-height: 1;
}

.close-btn:hover {
    color: var(--danger);
}

.history-modal-body {
    padding: 0;
    flex-grow: 1;
    overflow-y: auto;
    background: var(--bg-input);
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 13px;
}

.history-table th {
    padding: 10px 15px;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-muted);
    background: var(--bg-panel);
    position: sticky;
    top: 0;
}

.history-table td {
    padding: 10px 15px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
}

.history-table tr:hover td {
    background: rgba(0, 121, 107, 0.05);
}

.history-modal-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-dark);
}

#pageInfo {
    font-size: 14px;
    font-weight: bold;
    color: var(--text-main);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: #a4cfa9;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #82b589;
}