/* ===== 变量定义 - 暖色系 ===== */
:root {
    --nn-primary: #D84315;
    --nn-secondary: #FF8F00;
    --nn-accent: #FF6F00;
    --nn-bg: #FFFAF0;
    --nn-text: #4E342E;
    --nn-highlight: #FFF3E0;
    --nn-border: #FFE0B2;
    --nn-header-bg: #FFF3E0;
    --nn-white: #ffffff;
    --nn-gray-100: #f5f0eb;
    --nn-gray-200: #e8e0d8;
    --nn-gray-500: #8d6e63;
    --nn-gray-600: #6d4c41;
    --nn-red: #d32f2f;
    --nn-blue: #1565c0;
    --nn-green: #2e7d32;
    --nn-shadow: 0 2px 8px rgba(62, 39, 35, 0.08);
    --nn-radius: 10px;
}

/* ===== 页面容器 ===== */
.gd-container {
    display: flex;
    height: calc(100vh - 160px);
    gap: 20px;
    padding-bottom: 20px;
}

/* ===== 左侧参数面板 ===== */
.gd-left-panel {
    width: 360px;
    min-width: 320px;
    flex-shrink: 0;
    overflow-y: auto;
    background: var(--nn-white);
    border-radius: var(--nn-radius);
    box-shadow: var(--nn-shadow);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    scrollbar-width: thin;
    scrollbar-color: var(--nn-border) transparent;
}

.gd-left-panel::-webkit-scrollbar {
    width: 6px;
}
.gd-left-panel::-webkit-scrollbar-track {
    background: transparent;
}
.gd-left-panel::-webkit-scrollbar-thumb {
    background: var(--nn-border);
    border-radius: 3px;
}

.gd-panel-section {
    border: 1px solid var(--nn-border);
    border-radius: 8px;
    padding: 14px 16px;
    background: var(--nn-gray-100);
}

.gd-panel-section h3 {
    font-size: 14px;
    color: var(--nn-primary);
    margin: 0 0 12px 0;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--nn-border);
    display: flex;
    align-items: center;
    gap: 6px;
}

.gd-panel-section h3 .icon {
    font-size: 16px;
}

/* 参数行 */
.gd-param-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.gd-param-row label {
    font-size: 13px;
    color: var(--nn-gray-600);
    white-space: nowrap;
    min-width: 40px;
}

.gd-param-row input[type="range"] {
    flex: 1;
    min-width: 80px;
    accent-color: var(--nn-primary);
    height: 6px;
}

.gd-param-row .gd-param-value {
    font-size: 12px;
    color: var(--nn-primary);
    font-weight: 600;
    min-width: 48px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

.gd-param-row input[type="number"] {
    width: 80px;
    padding: 4px 8px;
    border: 1px solid var(--nn-border);
    border-radius: 6px;
    font-size: 13px;
    color: var(--nn-text);
    text-align: center;
}

.gd-param-row input[type="number"]:focus {
    outline: none;
    border-color: var(--nn-primary);
}

.gd-param-row select {
    padding: 4px 8px;
    border: 1px solid var(--nn-border);
    border-radius: 6px;
    font-size: 13px;
    color: var(--nn-text);
    background: var(--nn-white);
}

.gd-param-row select:focus {
    outline: none;
    border-color: var(--nn-primary);
}

.gd-divider {
    border: none;
    border-top: 1px solid var(--nn-border);
    margin: 10px 0;
}

/* 隐藏层列表 */
.gd-layer-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.gd-layer-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    background: var(--nn-white);
    border-radius: 6px;
    border: 1px solid var(--nn-border);
}

.gd-layer-row .gd-layer-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--nn-primary);
    white-space: nowrap;
}

.gd-layer-row input[type="number"] {
    width: 60px;
    padding: 3px 6px;
    border: 1px solid var(--nn-border);
    border-radius: 4px;
    font-size: 13px;
    text-align: center;
}

.gd-layer-row select {
    flex: 1;
    padding: 3px 6px;
    border: 1px solid var(--nn-border);
    border-radius: 4px;
    font-size: 12px;
    background: var(--nn-white);
}

.gd-btn-sm {
    padding: 2px 8px;
    font-size: 16px;
    line-height: 1;
    border: 1px solid var(--nn-border);
    border-radius: 4px;
    background: var(--nn-white);
    color: var(--nn-gray-600);
    cursor: pointer;
    transition: all 0.2s;
}

.gd-btn-sm:hover {
    background: #ffebee;
    border-color: var(--nn-primary);
    color: var(--nn-primary);
}

.gd-btn-add {
    align-self: flex-start;
    padding: 4px 14px;
    font-size: 13px;
    border: 1px dashed var(--nn-border);
    border-radius: 6px;
    background: var(--nn-white);
    color: var(--nn-primary);
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 4px;
}

.gd-btn-add:hover {
    border-color: var(--nn-primary);
    background: var(--nn-highlight);
}

/* 动态参数区域过渡 */
.gd-dynamic-params {
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    max-height: 200px;
    opacity: 1;
}

.gd-dynamic-params.hidden {
    max-height: 0;
    opacity: 0;
    margin: 0;
    padding: 0;
}

/* 数据集预设按钮 */
.gd-preset-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 10px;
}

.gd-preset-btn {
    padding: 4px 10px;
    font-size: 12px;
    border: 1px solid var(--nn-border);
    border-radius: 14px;
    background: var(--nn-white);
    color: var(--nn-text);
    cursor: pointer;
    transition: all 0.2s;
}

.gd-preset-btn:hover {
    border-color: var(--nn-primary);
    color: var(--nn-primary);
}

.gd-preset-btn.active {
    background: var(--nn-primary);
    color: var(--nn-white);
    border-color: var(--nn-primary);
}

/* 文件上传 */
.gd-upload-area {
    border: 2px dashed var(--nn-border);
    border-radius: 8px;
    padding: 10px;
    text-align: center;
    color: var(--nn-gray-500);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 13px;
}

.gd-upload-area:hover {
    border-color: var(--nn-primary);
    background: var(--nn-highlight);
}

.gd-upload-area input[type="file"] {
    display: none;
}

/* 列选择 */
.gd-column-select {
    display: flex;
    gap: 10px;
    margin-top: 8px;
    align-items: center;
}

.gd-column-select select {
    flex: 1;
    padding: 4px 8px;
    border: 1px solid var(--nn-border);
    border-radius: 6px;
    font-size: 13px;
    background: var(--nn-white);
}

/* 确定按钮 */
.gd-btn-apply {
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--nn-primary), var(--nn-accent));
    color: var(--nn-white);
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 6px;
    letter-spacing: 1px;
}

.gd-btn-apply:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(216, 67, 21, 0.3);
}

.gd-btn-apply:active {
    transform: translateY(0);
}

.gd-btn-apply:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ===== 右侧区域 ===== */
.gd-right-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 0;
}

/* 网络结构画布 */
.gd-network-panel {
    flex: 4;
    background: var(--nn-white);
    border-radius: var(--nn-radius);
    box-shadow: var(--nn-shadow);
    position: relative;
    overflow: hidden;
    min-height: 280px;
}

.gd-network-panel .gd-panel-title {
    position: absolute;
    top: 12px;
    left: 16px;
    font-size: 14px;
    font-weight: 700;
    color: var(--nn-primary);
    z-index: 2;
    pointer-events: none;
}

.gd-network-canvas {
    width: 100%;
    height: 100%;
}

.gd-network-canvas svg {
    display: block;
}

/* 拟合情况画布 */
.gd-fit-panel {
    flex: 4;
    background: var(--nn-white);
    border-radius: var(--nn-radius);
    box-shadow: var(--nn-shadow);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    min-height: 240px;
}

.gd-fit-tabs {
    display: flex;
    gap: 0;
    padding: 8px 12px 0;
    background: var(--nn-gray-100);
}

.gd-fit-tab {
    padding: 7px 18px;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid var(--nn-border);
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    background: var(--nn-gray-200);
    color: var(--nn-gray-500);
    cursor: pointer;
    transition: all 0.2s;
}

.gd-fit-tab:hover {
    color: var(--nn-primary);
}

.gd-fit-tab.active {
    background: var(--nn-white);
    color: var(--nn-primary);
    border-color: var(--nn-border);
}

.gd-fit-canvas {
    flex: 1;
    position: relative;
}

.gd-fit-canvas svg {
    display: block;
}

/* 复位按钮 */
.gd-reset-btn {
    position: absolute;
    bottom: 12px;
    left: 12px;
    padding: 5px 12px;
    font-size: 12px;
    border: 1px solid var(--nn-border);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.85);
    color: var(--nn-gray-500);
    cursor: pointer;
    z-index: 3;
    transition: all 0.2s;
    backdrop-filter: blur(4px);
}

.gd-reset-btn:hover {
    border-color: var(--nn-primary);
    color: var(--nn-primary);
    background: rgba(255, 255, 255, 0.95);
}

/* ===== 算法控制条 ===== */
.gd-control-bar {
    flex: 1.6;
    background: var(--nn-white);
    border-radius: var(--nn-radius);
    box-shadow: var(--nn-shadow);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 14px 24px;
    flex-wrap: wrap;
    min-height: 60px;
}

.gd-ctrl-btns {
    display: flex;
    gap: 10px;
}

.gd-ctrl-btn {
    padding: 10px 22px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 1px;
}

.gd-ctrl-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.gd-ctrl-btn.btn-play {
    background: var(--nn-red);
    color: var(--nn-white);
}

.gd-ctrl-btn.btn-play:hover:not(:disabled) {
    background: #388e3c;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(46, 125, 50, 0.3);
}

.gd-ctrl-btn.btn-pause {
    background: var(--nn-accent);
    color: var(--nn-white);
}

.gd-ctrl-btn.btn-pause:hover:not(:disabled) {
    background: #e65100;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 111, 0, 0.3);
}

.gd-ctrl-btn.btn-step {
    background: var(--nn-secondary);
    color: var(--nn-white);
}

.gd-ctrl-btn.btn-step:hover:not(:disabled) {
    background: #f57c00;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(255, 143, 0, 0.3);
}

.gd-ctrl-btn.btn-reset {
    background: var(--nn-gray-500);
    color: var(--nn-white);
}

.gd-ctrl-btn.btn-reset:hover:not(:disabled) {
    background: var(--nn-gray-600);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(109, 76, 65, 0.3);
}

/* 速度控制 */
.gd-speed-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.gd-speed-group label {
    font-size: 13px;
    color: var(--nn-gray-600);
    font-weight: 600;
    white-space: nowrap;
}

.gd-speed-group input[type="range"] {
    width: 120px;
    accent-color: var(--nn-primary);
}

.gd-speed-group .gd-speed-label {
    font-size: 12px;
    color: var(--nn-primary);
    font-weight: 600;
    min-width: 36px;
    text-align: center;
}

/* ===== Tooltip ===== */
.gd-tooltip {
    position: fixed;
    background: rgba(62, 39, 35, 0.92);
    color: #fff;
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 12px;
    pointer-events: none;
    display: none;
    z-index: 9999;
    line-height: 1.7;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    max-width: 280px;
    font-family: 'PingFang SC', 'Microsoft YaHei', monospace;
}

.gd-tooltip strong {
    color: #ffb74d;
}

/* ===== 列选择弹窗 ===== */
.gd-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.gd-modal {
    background: var(--nn-white);
    border-radius: var(--nn-radius);
    padding: 24px;
    min-width: 320px;
    max-width: 440px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.gd-modal h3 {
    color: var(--nn-primary);
    margin: 0 0 16px 0;
    font-size: 16px;
}

.gd-modal .gd-modal-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.gd-modal .gd-modal-row label {
    font-size: 13px;
    color: var(--nn-gray-600);
    min-width: 40px;
}

.gd-modal .gd-modal-row select {
    flex: 1;
    padding: 6px 10px;
    border: 1px solid var(--nn-border);
    border-radius: 6px;
    font-size: 13px;
    background: var(--nn-white);
}

.gd-modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 16px;
}

.gd-modal-actions button {
    padding: 8px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.gd-modal-actions .gd-btn-confirm {
    background: var(--nn-primary);
    color: var(--nn-white);
}

.gd-modal-actions .gd-btn-cancel {
    background: var(--nn-gray-200);
    color: var(--nn-text);
}

/* ===== 通用 Header/Nav 覆写 ===== */
.gd-container + .header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--nn-border);
}

/* ===== 响应式 ===== */
/* ===== 共享页面级样式（模拟 introduction 页面风格） ===== */
*, *::before, *::after {
    box-sizing: border-box;
}

.container {
    margin: 0 auto;
}

.gd-page-wrapper {
    max-width: 1500px;
    padding: 0 20px;
}

:root {
    --primary-color: var(--nn-primary);
}

body {
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.5;
    font-size: 16px;
    color: var(--nn-text);
    background-color: var(--nn-bg);
    margin: 0;
    padding: 0;
}

.back-btn {
    display: inline-block;
    margin-top: 16px;
    margin-bottom: 20px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #ffb300, #ff8f00);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.back-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(255, 140, 0, 0.3);
}

.header {
    text-align: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--nn-border);
}

.header h1 {
    color: var(--nn-primary);
    margin-bottom: 8px;
    margin-top: 0;
    font-size: 2.2em;
}

.subtitle {
    color: var(--nn-gray-500);
    font-size: 1.1em;
}

.navigation {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.nav-btn {
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--nn-border);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    color: var(--nn-text);
    transition: all 0.3s ease;
}

.nav-btn:hover {
    border-color: var(--nn-primary);
    color: var(--nn-primary);
    transform: translateY(-2px);
}

.nav-btn.active {
    background: var(--nn-primary);
    color: white;
    border-color: var(--nn-primary);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
    .gd-container {
        flex-direction: column;
        height: auto;
    }

    .gd-left-panel {
        width: 100%;
        min-width: 0;
        max-height: 50vh;
    }

    .gd-right-area {
        min-height: 600px;
    }

    .gd-control-bar {
        flex-direction: column;
        gap: 10px;
    }

    .gd-ctrl-btns {
        flex-wrap: wrap;
        justify-content: center;
    }
}