:root {
    --primary-color: #1b6ef3;
    --bg-color: #f0f4f9;
    --surface-color: #ffffff;
    --text-primary: #1f1f1f;
    --text-secondary: #444746;
    --border-radius: 16px;
    --border-color: #e3e3e3;
    /* 安全区域变量 */
    --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
}

/* 防止移动端橡皮筋效果和视口问题 */
html {
    height: 100%;
    overflow: hidden;
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
}

body {
    margin: 0;
    font-family: 'Google Sans', 'Roboto', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100%;
    overflow: hidden;
    overscroll-behavior: none;
    /* 防止 iOS Safari 下拉刷新 */
    position: fixed;
    width: 100%;
}

.el-container {
    height: 100%;
    overflow: hidden;
}

#app {
    height: 100%;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.el-aside {
    background-color: var(--bg-color);
    border-right: none;
    padding: 16px;
    display: flex;
    flex-direction: column;
    transition: all 0.3s;
}

.logo {
    font-size: 22px;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
    height: 64px;
    padding-left: 12px;
    margin-bottom: 16px;
}

.el-menu {
    background-color: transparent;
    border-right: none;
}

.el-menu-item {
    height: 48px;
    line-height: 48px;
    border-radius: 24px;
    margin-bottom: 4px;
    color: var(--text-secondary);
    font-weight: 500;
}

.el-menu-item:hover {
    background-color: #e8eaed;
}

.el-menu-item.is-active {
    background-color: #d3e3fd;
    color: #041e49;
    font-weight: 600;
}

/* 主内容区域 - 四角圆角 */
.el-main {
    padding: 24px;
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    margin: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    overflow-y: auto;
    overflow-x: hidden;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    /* 确保内容可以滚动但不会产生额外空间 */
    flex: 1;
    min-height: 0;
}

.el-header {
    display: none;
}

/* Custom Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.page-title {
    font-size: 24px;
    font-weight: 400;
    color: var(--text-primary);
}

/* Cards */
.el-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: none !important;
    transition: all 0.2s;
}

.el-card:hover {
    border-color: #c4c7c5;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05) !important;
}

/* Buttons */
.el-button {
    border-radius: 20px;
    font-weight: 500;
}

.el-button--primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.el-tag {
    border-radius: 8px;
}

/* Table */
.el-table {
    --el-table-header-bg-color: #fff;
    --el-table-row-hover-bg-color: #f8f9fa;
}

.el-table th.el-table__cell {
    font-weight: 500;
    color: var(--text-secondary);
}

/* Mobile Responsive Styles */
.mobile-header {
    display: none;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: #fff;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.mobile-menu-drawer .el-drawer__body {
    padding: 0;
    background-color: var(--bg-color);
}

/* 试卷卡片网格 */
.exam-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 16px;
}

/* 试卷卡片 */
.exam-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    cursor: pointer;
    /* 加速动画性能 */
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
}

.exam-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(27, 110, 243, 0.12);
    transform: translateY(-2px) translateZ(0);
}

.exam-card-header {
    margin-bottom: 12px;
    min-height: 22px;
}

.exam-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.4;
}

.exam-card-count {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 20px;
}

.exam-card-count .count-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
}

.exam-card-count .count-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.exam-card-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* 大类卡片网格 */
.category-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 16px;
}

/* 大类卡片 */
.category-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 24px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.category-card:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(27, 110, 243, 0.12);
    transform: translateY(-2px);
}

.category-card-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.category-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.category-card-info {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.category-card-info .info-label {
    margin-right: 4px;
}

.category-card-info .info-value {
    font-weight: 600;
    color: var(--primary-color);
}

.category-card-actions {
    display: flex;
    justify-content: center;
    gap: 8px;
}

/* 空状态 */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    background: #f8f9fa;
    border-radius: var(--border-radius);
    border: 2px dashed var(--border-color);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-text {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .desktop-aside {
        display: none !important;
    }

    .mobile-header {
        display: flex;
        flex-shrink: 0;
    }

    /* 移动端主容器 */
    .el-container {
        flex: 1;
        min-height: 0;
    }

    .el-main {
        margin: 0 !important;
        padding: 16px !important;
        padding-bottom: calc(16px + var(--safe-area-inset-bottom)) !important;
        border-radius: 0 !important;
        border: none !important;
        /* 使用 flex 布局代替固定高度 */
        flex: 1;
        min-height: 0;
        max-height: 100%;
        overflow-y: auto;
        overflow-x: hidden;
        overscroll-behavior: contain;
        -webkit-overflow-scrolling: touch;
    }

    /* 修复内部容器 */
    .el-container>.el-container {
        flex: 1;
        min-height: 0;
        overflow: hidden;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .page-header .el-button {
        width: 100%;
        margin-left: 0 !important;
        margin-top: 8px;
    }

    .page-header>div:last-child {
        width: 100%;
        display: flex;
        flex-direction: column;
        gap: 8px;
    }

    .el-select {
        width: 100% !important;
    }

    .el-dialog {
        width: 90% !important;
        max-width: none !important;
    }

    .el-table .cell {
        padding: 0 8px;
    }

    .exam-cards-grid,
    .category-cards-grid {
        grid-template-columns: 1fr;
    }

    /* 防止最后一个卡片被遮挡 */
    .exam-cards-grid::after,
    .category-cards-grid::after {
        content: '';
        display: block;
        height: var(--safe-area-inset-bottom);
    }
}

/* ============================================================
   弹窗样式覆盖 - Dialog Override Styles
   使用高优先级选择器确保覆盖 Element Plus 默认样式
   ============================================================ */

/* 遮罩层 */
body .el-overlay {
    background: rgba(15, 23, 42, 0.5) !important;
}

/* 弹窗容器居中 */
body .el-overlay-dialog {
    display: flex !important;
    justify-content: center !important;
    align-items: center !important;
    min-height: 100vh !important;
    padding: 20px !important;
    box-sizing: border-box !important;
}

/* 弹窗主体 */
body .el-overlay .el-overlay-dialog .el-dialog,
body .el-dialog {
    border-radius: 16px !important;
    border: 1px solid rgba(0, 0, 0, 0.06) !important;
    box-shadow:
        0 0 0 1px rgba(0, 0, 0, 0.02),
        0 4px 8px rgba(0, 0, 0, 0.04),
        0 16px 32px rgba(0, 0, 0, 0.08) !important;
    overflow: hidden !important;
    margin: 0 !important;
}

/* 弹窗头部 */
body .el-dialog .el-dialog__header {
    padding: 20px 24px 12px !important;
    margin-right: 0 !important;
    border-bottom: none !important;
}

body .el-dialog .el-dialog__title {
    font-size: 17px !important;
    font-weight: 600 !important;
    color: #111827 !important;
}

/* 关闭按钮 */
body .el-dialog .el-dialog__headerbtn {
    top: 16px !important;
    right: 16px !important;
    width: 32px !important;
    height: 32px !important;
    border-radius: 8px !important;
    background: transparent !important;
    transition: background 0.15s !important;
}

body .el-dialog .el-dialog__headerbtn:hover {
    background: #f3f4f6 !important;
}

body .el-dialog .el-dialog__headerbtn .el-dialog__close {
    font-size: 16px !important;
    color: #6b7280 !important;
}

/* 弹窗内容 */
body .el-dialog .el-dialog__body {
    padding: 16px 24px !important;
    color: #374151 !important;
}

/* 弹窗底部 */
body .el-dialog .el-dialog__footer {
    padding: 16px 24px 20px !important;
    border-top: 1px solid #f3f4f6 !important;
    background: #f9fafb !important;
    display: flex !important;
    flex-wrap: nowrap !important;
    justify-content: flex-end !important;
    gap: 8px !important;
}

/* 底部按钮 */
body .el-dialog .el-dialog__footer .el-button {
    height: 36px !important;
    padding: 0 18px !important;
    border-radius: 8px !important;
    font-size: 14px !important;
    font-weight: 500 !important;
    margin: 0 !important;
    flex-shrink: 0 !important;
}

/* 移动端按钮适配 */
@media (max-width: 768px) {
    body .el-dialog .el-dialog__footer {
        padding: 12px 16px 16px !important;
        gap: 6px !important;
    }

    body .el-dialog .el-dialog__footer .el-button {
        height: 32px !important;
        padding: 0 10px !important;
        font-size: 13px !important;
        flex-shrink: 1 !important;
        min-width: auto !important;
    }
}

/* 取消按钮 */
body .el-dialog .el-dialog__footer .el-button--default {
    background: #ffffff !important;
    color: #374151 !important;
    border: 1px solid #d1d5db !important;
}

body .el-dialog .el-dialog__footer .el-button--default:hover {
    background: #f9fafb !important;
    border-color: #9ca3af !important;
}

/* 主按钮 */
body .el-dialog .el-dialog__footer .el-button--primary {
    background: #2563eb !important;
    color: #ffffff !important;
    border: none !important;
    box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3) !important;
}

body .el-dialog .el-dialog__footer .el-button--primary:hover {
    background: #1d4ed8 !important;
}

/* 成功按钮 */
body .el-dialog .el-dialog__footer .el-button--success {
    background: #059669 !important;
    color: #ffffff !important;
    border: none !important;
}

/* ============================================================
   表单元素
   ============================================================ */

body .el-dialog .el-form-item {
    margin-bottom: 18px !important;
}

body .el-dialog .el-form-item__label {
    font-size: 13px !important;
    font-weight: 500 !important;
    color: #6b7280 !important;
    padding-bottom: 6px !important;
}

/* 输入框 */
body .el-dialog .el-input .el-input__wrapper {
    border-radius: 8px !important;
    border: 1px solid #e5e7eb !important;
    box-shadow: none !important;
    padding: 0 12px !important;
    height: 38px !important;
    transition: border-color 0.15s, box-shadow 0.15s !important;
}

body .el-dialog .el-input .el-input__wrapper:hover {
    border-color: #d1d5db !important;
}

body .el-dialog .el-input .el-input__wrapper.is-focus {
    border-color: #2563eb !important;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1) !important;
}

/* 文本域 */
body .el-dialog .el-textarea .el-textarea__inner {
    border-radius: 8px !important;
    border: 1px solid #e5e7eb !important;
    box-shadow: none !important;
    padding: 10px 12px !important;
}

body .el-dialog .el-textarea .el-textarea__inner:hover {
    border-color: #d1d5db !important;
}

body .el-dialog .el-textarea .el-textarea__inner:focus {
    border-color: #2563eb !important;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1) !important;
}

/* 数字输入框 */
body .el-dialog .el-input-number .el-input__wrapper {
    padding-left: 44px !important;
    padding-right: 44px !important;
}

body .el-dialog .el-input-number__decrease,
body .el-dialog .el-input-number__increase {
    width: 36px !important;
    background: #f9fafb !important;
    border: none !important;
    color: #6b7280 !important;
}

body .el-dialog .el-input-number__decrease:hover,
body .el-dialog .el-input-number__increase:hover {
    background: #f3f4f6 !important;
    color: #111827 !important;
}

/* 下拉选择 */
body .el-dialog .el-select .el-input .el-input__wrapper {
    border-radius: 8px !important;
}

/* 复选框 */
body .el-dialog .el-checkbox.is-bordered {
    border-radius: 8px !important;
    border: 1px solid #e5e7eb !important;
    padding: 8px 12px !important;
    height: auto !important;
}

body .el-dialog .el-checkbox.is-bordered.is-checked {
    border-color: #2563eb !important;
    background: rgba(37, 99, 235, 0.04) !important;
}

/* 选项卡片 */
body .el-dialog .option-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding: 10px 12px;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
}

body .el-dialog .option-item:hover {
    background: #f3f4f6;
}

/* 添加选项按钮 */
body .el-dialog .el-button--primary.is-plain {
    background: #f9fafb !important;
    border: 1px dashed #d1d5db !important;
    color: #6b7280 !important;
    border-radius: 8px !important;
}

body .el-dialog .el-button--primary.is-plain:hover {
    border-color: #2563eb !important;
    border-style: solid !important;
    color: #2563eb !important;
    background: rgba(37, 99, 235, 0.04) !important;
}

/* 删除按钮 */
body .el-dialog .el-button--danger.is-circle {
    background: transparent !important;
    border: none !important;
    color: #9ca3af !important;
}

body .el-dialog .el-button--danger.is-circle:hover {
    background: #fef2f2 !important;
    color: #dc2626 !important;
}

/* ============================================================
   下拉菜单
   ============================================================ */

body .el-select-dropdown {
    border-radius: 10px !important;
    border: 1px solid #e5e7eb !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1) !important;
    padding: 4px !important;
}

body .el-select-dropdown .el-select-dropdown__item {
    border-radius: 6px !important;
    margin: 2px !important;
    padding: 8px 10px !important;
}

body .el-select-dropdown .el-select-dropdown__item:hover {
    background: #f3f4f6 !important;
}

body .el-select-dropdown .el-select-dropdown__item.selected {
    background: #eff6ff !important;
    color: #2563eb !important;
    font-weight: 500 !important;
}

/* ============================================================
   确认框
   ============================================================ */

body .el-message-box {
    border-radius: 14px !important;
    border: none !important;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15) !important;
    padding: 0 !important;
}

body .el-message-box .el-message-box__header {
    padding: 20px 24px 0 !important;
}

body .el-message-box .el-message-box__title {
    font-size: 16px !important;
    font-weight: 600 !important;
}

body .el-message-box .el-message-box__content {
    padding: 12px 24px 24px !important;
    color: #6b7280 !important;
}

body .el-message-box .el-message-box__btns {
    padding: 0 24px 20px !important;
}

body .el-message-box .el-message-box__btns .el-button {
    border-radius: 8px !important;
}

/* ============================================================
   消息提示
   ============================================================ */

body .el-message {
    border-radius: 10px !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1) !important;
}

/* ============================================================
   抽屉
   ============================================================ */

body .el-drawer {
    border-radius: 16px 0 0 16px !important;
}

body .el-drawer.btt {
    border-radius: 16px 16px 0 0 !important;
}

body .el-drawer .el-drawer__header {
    padding: 16px 20px !important;
    margin-bottom: 0 !important;
    border-bottom: 1px solid #f3f4f6 !important;
}

body .el-drawer .el-drawer__title {
    font-size: 16px !important;
    font-weight: 600 !important;
}