:root {
    /* 浅色高对比护眼配色 - 暖白基调 */
    --bg-dark: #fcfaf2;
    --bg-sidebar: #f3f0e8;
    --bg-activity: #1a252f;
    --bg-header: #ebe7dd;
    --bg-tab: #e0ddd2;
    --bg-tab-active: #fcfaf2;
    --text-fg: #1a252f;
    --text-muted: #626567;
    --accent-blue: #1a5fb4;
    --border: #d5d1c5;
    --hover: #e5e1d5;
    --selection: #d6eaf8;
    --key-bg: #ced4da;

    /* 现代中文字体系统 */
    --font-main: "Microsoft YaHei", "微软雅黑", sans-serif;
    --font-serif: "KaiTi", "楷体", serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-fg);
    font-family: var(--font-main);
    font-size: 14px;
    height: 100vh;
    display: flex;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Activity Bar */
.activity-bar {
    width: 60px;
    background-color: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 15px;
    padding-bottom: 15px;
    border-right: 1px solid var(--border);
    justify-content: space-between;
}

.icon {
    width: 60px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 20px;
    transition: color 0.2s, background-color 0.2s;
    position: relative;
}

.icon:hover {
    color: var(--text-fg);
}

.icon.active {
    color: var(--accent-blue);
}

.icon.active::after {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    bottom: 5px;
    width: 2px;
    background-color: var(--accent-blue);
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-title {
    padding: 10px 15px;
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
}

.section-header {
    padding: 8px 10px;
    background-color: transparent;
    /* 去除分组标题背景 */
    font-size: 11px;
    font-weight: bold;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
}

.section-header i {
    margin-right: 5px;
}

.tree-container {
    padding: 5px 0;
}

.tree-item {
    padding: 3px 25px;
    font-size: 13px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.tree-item:hover {
    background-color: var(--hover);
}

.tree-item.active {
    background-color: var(--selection);
    color: white;
}

.tree-item.grade {
    font-weight: bold;
    padding-left: 15px;
    color: var(--accent-blue);
}

.tree-item.class {
    padding-left: 30px;
}

/* Main View */
.main-view {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tabs-header {
    height: 35px;
    background-color: var(--bg-header);
    display: flex;
    overflow-x: auto;
}

.tab {
    padding: 0 15px;
    display: flex;
    align-items: center;
    background-color: var(--bg-tab);
    border-right: 1px solid var(--border);
    font-size: 12px;
    cursor: pointer;
    min-width: 120px;
}

.tab.active {
    background-color: var(--bg-tab-active);
    border-top: 1px solid var(--accent-blue);
}

.tab i {
    margin-right: 8px;
    color: var(--accent-blue);
}

.tab .close-btn {
    margin-left: auto;
    padding: 2px;
    border-radius: 3px;
    visibility: hidden;
}

.tab:hover .close-btn {
    visibility: visible;
}

.tab .close-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #e74c3c;
    /* 鲜艳但不刺眼的红色 */
}

/* Content Area */
.editor-area {
    flex: 1;
    overflow: auto;
    background-color: var(--bg-dark);
}

.empty-state {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.empty-state h2 {
    margin: 20px 0 10px;
    color: var(--text-fg);
}

.shortcuts {
    margin-top: 30px;
}

.shortcuts div {
    margin: 10px 0;
    font-size: 13px;
}

.key {
    background-color: var(--key-bg);
    padding: 2px 6px;
    border-radius: 3px;
    color: white;
    font-family: var(--font-mono);
}

/* Schedule Table */
#schedule-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 15px 25px;
    /* 减小内边距，增加可视空间 */
    animation: fadeIn 0.3s ease;
    box-sizing: border-box;
}

.schedule-header {
    margin-bottom: 12px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 8px;
    flex-shrink: 0;
}

.view-meta {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.schedule-table-wrapper {
    flex: 1;
    /* 撑满剩余高度 */
    display: flex;
    flex-direction: column;
}

#main-table {
    height: 100%;
    flex: 1;
}

table {
    width: 100%;
    min-width: 800px;
    /* 保证在小屏下仍可滚动查看 */
    border-collapse: collapse;
    table-layout: fixed;
    /* 固定布局使格子等宽 */
    background-color: transparent;
}

/* 强制让 TBODY 填满以便分配行高 */
#table-body {
    height: 100%;
}

.break-row {
    height: 25px;
    /* 午休行保持小高度 */
    background-color: rgba(0, 0, 0, 0.02);
}

.break-row td {
    padding: 2px !important;
}

th,
td {
    border: 1px solid var(--border);
    padding: 10px;
    text-align: center;
}

th {
    background-color: var(--bg-sidebar);
    color: var(--text-fg);
    font-weight: 900;
    font-size: 15px;
    height: 45px;
}

.col-section {
    width: 60px;
    color: var(--accent-blue);
    font-weight: bold;
    font-family: var(--font-mono);
}

.course-cell {
    vertical-align: top;
    padding: 0;
    transition: all 0.2s ease;
    height: 1px;
}

.cell-content {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    height: 100%;
    padding: 2px;
    box-sizing: border-box;
}

.course-item {
    margin: 2px;
    /* 使用 margin 保证四周间距均匀 */
    padding: 4px 10px;
    border-radius: 4px;
    background: var(--accent-blue);
    color: white;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex: 1;
    /* 关键：撑满垂直可用空间 */
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
}

.course-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* 班级视角 - 极简展现 (无卡片、无圆角、无背景) */
.class-view-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    gap: 4px;
}

.subject-text {
    font-size: 16px;
    font-weight: 900;
    color: var(--text-fg);
}

.teacher-text {
    font-size: 12px;
    color: var(--text-muted);
    font-family: var(--font-serif);
}

/* 丰富的高对比配色方案 (使用变量支持自定义) */
.course-item.tag-default {
    background-color: var(--tag-default, #4A6D85);
    color: white;
}

/* 动态生成 tag-0 到 tag-4 样式 */
[class*="tag-"] {
    color: white;
}

.course-item.tag-0 {
    background-color: var(--tag-0);
}

.course-item.tag-1 {
    background-color: var(--tag-1);
}

.course-item.tag-2 {
    background-color: var(--tag-2);
}

.course-item.tag-3 {
    background-color: var(--tag-3);
}

.course-item.tag-4 {
    background-color: var(--tag-4);
}

.course-name {
    font-size: 15px;
    font-weight: 900;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.meta-row {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 4px;
}

.class-label {
    background: rgba(255, 255, 255, 0.25);
    padding: 1px 6px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: bold;
    color: white;
    white-space: nowrap;
}

.teacher-label {
    opacity: 0.9;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    padding-right: 4px;
    border-right: 1px solid rgba(255, 255, 255, 0.4);
}

.teacher-label::after {
    display: none;
}

/* Styles for specific subjects - VS Code Syntax like */
.course-cell.highlight {
    background-color: transparent;
    /* 完全去除背景色，仅保留内容 */
}

.hidden {
    display: none !important;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #444;
}

::-webkit-scrollbar-thumb:hover {
    background: #666;
}

/* Search Results UI */
.search-input-container {
    padding: 10px;
}

#global-search {
    width: 100%;
    background-color: var(--bg-dark);
    border: 1px solid var(--accent-blue);
    padding: 6px 12px;
    color: var(--text-fg);
    outline: none;
}

.results-container {
    padding: 0;
}

.result-item {
    padding: 10px 15px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
}

.result-item:hover {
    background-color: var(--hover);
}

.result-title {
    font-size: 13px;
    color: var(--accent-blue);
}

.result-desc {
    font-size: 11px;
    color: var(--text-muted);
}

/* Settings UI */
.settings-group {
    padding: 15px;
}

.setting-item {
    margin-bottom: 20px;
}

.setting-item label {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: bold;
}

.setting-input-wrapper select {
    width: 100%;
    background: var(--bg-dark);
    color: var(--text-fg);
    border: 1px solid var(--border);
    padding: 5px;
    outline: none;
    font-size: 13px;
}

.setting-divider {
    height: 1px;
    background: var(--border);
    margin: 20px 0;
}

/* Color Presets UI */
.color-config-card {
    background: var(--bg-header);
    border-radius: 6px;
    padding: 12px;
    margin-bottom: 12px;
    border: 1px solid var(--border);
}

.color-label {
    font-size: 11px;
    font-weight: bold;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.preset-dot {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.2s, border-color 0.2s;
}

.preset-dot:hover {
    transform: scale(1.1);
}

.preset-dot.active {
    border-color: var(--text-fg);
    transform: scale(1.1);
}

.color-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
}

.btn-secondary {
    width: 100%;
    padding: 6px;
    background: var(--bg-header);
    color: var(--text-fg);
    border: 1px solid var(--border);
    cursor: pointer;
    font-size: 12px;
    border-radius: 2px;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: var(--hover);
}

.search-section-label {
    background-color: var(--bg-sidebar);
    padding: 6px 12px;
    font-size: 11px;
    font-weight: bold;
    color: var(--accent-blue);
    border-bottom: 1px solid var(--border);
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.no-results {
    padding: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

/* Week Toggle Styles */
.week-toggle-container {
    padding: 10px 15px;
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.week-btn {
    flex: 1;
    padding: 6px;
    text-align: center;
    background: var(--bg-tab);
    border: 1px solid var(--border);
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
    color: var(--text-muted);
}

.week-btn:hover {
    background: var(--hover);
}

.week-btn.active {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

/* Rotation Course Item Styles */
.course-item.rotation {
    position: relative;
    overflow: hidden;
}

/* A/B 水印 (单周 A, 双周 B) */
.course-item.rotation::after {
    content: attr(data-week-type);
    position: absolute;
    right: 2px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 56px;
    font-weight: 900;
    opacity: 0.4;
    color: #ffffff;
    pointer-events: none;
    font-family: 'Arial Black', sans-serif;
    z-index: 0;
}

.class-view-content,
.course-item>* {
    position: relative;
    z-index: 1;
}

.teacher-main {
    font-weight: bold;
}

.teacher-sub {
    font-size: 0.9em;
    opacity: 0.6;
    margin-left: 4px;
}

.teacher-sub::before {
    content: '(';
}

.teacher-sub::after {
    content: ')';
}

/* Auth Overlay Styles */
#auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--bg-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.auth-card {
    background: var(--bg-sidebar);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    max-width: 400px;
    width: 90%;
    border: 1px solid var(--border);
}

.auth-card h2 {
    margin-bottom: 10px;
    color: var(--text-fg);
}

.auth-card p {
    color: var(--text-muted);
    margin-bottom: 25px;
    font-size: 14px;
}

.auth-input-group {
    display: flex;
    gap: 10px;
    flex-direction: column;
}

.auth-input-group input {
    padding: 12px 15px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg-dark);
    color: var(--text-fg);
    font-size: 16px;
    outline: none;
    text-align: center;
}

.auth-input-group input:focus {
    border-color: var(--accent-blue);
}

.auth-input-group button {
    padding: 12px;
    background: var(--accent-blue);
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
    transition: opacity 0.2s;
}

.auth-input-group button:hover {
    opacity: 0.9;
}