/**
 * iExam 8.0 茂名考试管理系统 - 首页样式（标准版）
 * 设计风格：现代专业教育风格
 * 创建日期：2026-01-22
 * 版本：v1.0
 */

/* ==================== CSS 变量定义 ==================== */
:root {
    /* 主色调 - 教育蓝（专业版） */
    --primary-color: #2196F3;
    --primary-light: #42a5f5;
    --primary-dark: #1976D2;

    /* 辅助色 */
    --secondary-color: #26a69a;
    --accent-color: #ff6b6b;
    --warning-color: #ffa726;

    /* 中性色 */
    --text-primary: #2c3e50;
    --text-secondary: #546e7a;
    --text-light: #78909c;
    --text-white: #ffffff;

    /* 背景色（优化版 - 增加青色过渡，减少视觉疲劳） */
    --bg-gradient: linear-gradient(135deg, #1565C0 0%, #1976D2 25%, #2196F3 50%, #26C6DA 75%, #4DD0E1 100%);
    --bg-overlay: rgba(255, 255, 255, 0.96);
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-glass: rgba(255, 255, 255, 0.15);

    /* 字体 */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "微软雅黑", "PingFang SC", "Hiragino Sans GB", sans-serif;
    --font-size-h1: 32px;
    --font-size-h2: 24px;
    --font-size-h3: 18px;
    --font-size-base: 14px;
    --font-size-small: 12px;

    /* 字重 */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 600;

    /* 布局 */
    --container-max-width: 1200px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;

    /* 圆角 - 与LayUI 2.2.2风格保持一致 */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 8px;

    /* 阴影（优化版 - 使用柔和的蓝色阴影） */
    --shadow-sm: 0 2px 8px rgba(33, 150, 243, 0.08);
    --shadow-md: 0 4px 16px rgba(33, 150, 243, 0.12);
    --shadow-lg: 0 8px 24px rgba(33, 150, 243, 0.16);
    --shadow-hover: 0 12px 32px rgba(33, 150, 243, 0.20);

    /* 动画 */
    --transition-fast: 150ms;
    --transition-base: 300ms;
    --transition-slow: 500ms;
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==================== 全局样式重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    height: 100%;
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 背景设计 ==================== */
body {
    background: var(--bg-gradient);
    position: relative;
    height: 100vh;
    overflow: hidden;
}

/* 背景装饰 - 右上角圆形（增强版） */
body::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 900px;
    height: 900px;
    background: radial-gradient(circle, rgba(255,255,255,0.12) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}

/* 背景装饰 - 左下角圆形（增强版） */
body::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -5%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}

/* ==================== 工具类 ==================== */
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

.fl {
    float: left;
}

.fr {
    float: right;
}

/* ==================== 头部样式 ==================== */
.head {
    position: relative;
    z-index: 100;
    height: 64px;
    background: var(--bg-overlay);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    visibility: visible;
}

/* IE9 降级方案 */
@supports not (backdrop-filter: blur(10px)) {
    .head {
        background: rgba(255, 255, 255, 0.98);
    }
}

.head h1 {
    display: flex;
    align-items: center;
    font-size: var(--font-size-h2);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin: 0;
    visibility: visible;
    opacity: 1;
}

.head h1 img {
    margin-right: var(--spacing-md);
    vertical-align: middle;
}

.head h1 span {
    vertical-align: middle;
}

/* ==================== 主内容区 ==================== */
.main {
    position: relative;
    z-index: 10;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 64px - 40px);
    overflow: hidden;
}

/* 背景装饰图片 - 全屏覆盖版（充满整个背景，不留空） */
.main::before {
    content: '';
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: calc(100vh - 64px);
    background: url(imgs/bg-4.png) no-repeat center center;
    background-size: cover;
    pointer-events: none;
    z-index: 1;
    filter: saturate(1.1) brightness(1.05);
}
.center {
    width: 100%;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-xl);
    align-items: flex-start;
    position: relative;
    z-index: 10;
}

/* ==================== 卡片样式 ==================== */
.main-left,
.main-right {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base) var(--ease-in-out);
    display: flex;
    flex-direction: column;
}

/* IE9 降级方案 */
@supports not (backdrop-filter: blur(10px)) {
    .main-left,
    .main-right {
        background: rgba(255, 255, 255, 0.85);
    }
}

.main-left:hover,
.main-right:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 左侧下载列表容器 - 添加滚动 */
.main-left {
    height: 100%;
    max-height: calc(100vh - 64px - 40px - 96px);
}

/* 右侧按钮容器优化 */
.main-right {
    justify-content: center;
    padding: var(--spacing-xxl) var(--spacing-xl);
    height: 100%;
    max-height: calc(100vh - 64px - 40px - 96px);
}

/* 无数据提示 */
.no-data {
    color: var(--accent-color);
    font-size: var(--font-size-small);
    text-align: center;
    padding: var(--spacing-lg) 0;
}

/* ==================== 标题样式 ==================== */
.main-title {
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    position: relative;
}

.main-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), transparent);
    border-radius: 2px;
}

/* ==================== 下载列表样式 ==================== */
.main-download-list {
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: var(--spacing-sm);
}

/* 自定义滚动条样式 */
.main-download-list::-webkit-scrollbar {
    width: 6px;
}

.main-download-list::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 3px;
}

.main-download-list::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 3px;
    transition: background var(--transition-fast);
}

.main-download-list::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Firefox 滚动条样式 */
.main-download-list {
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) rgba(0, 0, 0, 0.05);
}

.main-download-list li {
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-fast) var(--ease-in-out);
}

.main-download-list li:last-child {
    margin-bottom: 0;
}

.main-download-list li:hover {
    transform: translateX(4px);
}

.main-download-list a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: all var(--transition-base) var(--ease-in-out);
    cursor: pointer;
    position: relative;
}

/* 下载图标提示 */
.main-download-list a::after {
    content: '↓';
    color: var(--primary-color);
    font-size: 18px;
    font-weight: bold;
    opacity: 0;
    margin-left: var(--spacing-sm);
    transition: opacity var(--transition-base);
}

.main-download-list a:hover {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
    padding-left: calc(var(--spacing-md) + 4px);
    color: var(--primary-color);
}

.main-download-list a:hover::after {
    opacity: 1;
}

.main-download-list a:active {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.main-download-left {
    flex: 1;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    display: flex;
    align-items: center;
}

.main-download-dot {
    color: var(--primary-color);
    font-weight: var(--font-weight-bold);
    margin-right: var(--spacing-sm);
}

.main-download-right {
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    white-space: nowrap;
    margin-left: var(--spacing-md);
}

/* ==================== 按钮样式 ==================== */
.main-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-md);
    text-align: center;
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-in-out);
    position: relative;
    overflow: hidden;
}

.main-btn:last-child {
    margin-bottom: 0;
}

.main-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-slow) var(--ease-in-out);
}
.main-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(33, 150, 243, 0.30);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    filter: brightness(1.05);
}

.main-btn:hover::before {
    left: 100%;
}

.main-btn:active {
    transform: translateY(0) scale(0.98);
    box-shadow: var(--shadow-sm);
}

/* SVG 图标样式 */
.btn-icon {
    flex-shrink: 0;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* 按钮文字 */
.main-btn span {
    flex: 1;
    text-align: center;
}

/* 不同按钮类型的颜色变化 - 主次按钮区分 */
.main-btn-admin,
.main-btn-student {
    /* 主要按钮 - 保持蓝色渐变 */
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

.main-btn-register,
.main-btn-query {
    /* 次要按钮 - 轮廓样式 */
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.main-btn-register:hover,
.main-btn-query:hover {
    background: var(--primary-color);
    color: var(--text-white);
    border-color: var(--primary-color);
}

.main-btn-register .btn-icon,
.main-btn-query .btn-icon {
    stroke: var(--primary-color);
}

.main-btn-register:hover .btn-icon,
.main-btn-query:hover .btn-icon {
    stroke: var(--text-white);
}

/* ==================== 页脚样式 ==================== */
.footer {
    position: relative;
    z-index: 10;
    height: 40px;
}

/* ==================== 焦点样式（无障碍） ==================== */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .head {
        padding: 0 var(--spacing-md);
    }

    .head h1 {
        font-size: var(--font-size-h3);
    }

    .main {
        padding: var(--spacing-lg) var(--spacing-md);
        min-height: auto;
    }

    .center {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .main-left,
    .main-right {
        padding: var(--spacing-lg);
        max-height: none;
    }

    .main-download-list {
        max-height: none;
        overflow-y: visible;
    }

    .main-title {
        font-size: var(--font-size-base);
    }

    .main-btn {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-small);
        margin-bottom: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .head h1 img {
        width: 32px;
        height: 18px;
    }

    .main-download-list a {
        padding: var(--spacing-sm);
    }

    .main-download-left,
    .main-download-right {
        font-size: var(--font-size-small);
    }
}

/* ==================== 打印样式 ==================== */
@media print {
    body {
        background: white;
    }

    body::before,
    body::after {
        display: none;
    }

    .head,
    .main-left,
    .main-right {
        background: white;
        box-shadow: none;
    }

    .main-btn {
        display: none;
    }
}
/* ==================== 页面加载动画样式（增强版 - 更醒目的蓝色效果） ==================== */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1565C0 0%, #1976D2 25%, #2196F3 50%, #26C6DA 75%, #4DD0E1 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--transition-slow) var(--ease-in-out);
    overflow: hidden;
}

/* 背景动态光效 */
.page-loader::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 70%);
    animation: rotate-light 8s linear infinite;
}

@keyframes rotate-light {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.page-loader.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loader-content {
    text-align: center;
    color: var(--text-white);
    position: relative;
    z-index: 1;
}

/* 增强版加载圆环 - 双层旋转效果 */
.loader-spinner {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    position: relative;
}

/* 外层圆环 - 白色边框 */
.loader-spinner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 5px solid rgba(255, 255, 255, 0.2);
    border-top-color: #ffffff;
    border-right-color: #ffffff;
    border-radius: 50%;
    animation: spin-outer 1.2s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

/* 内层圆环 - 青色边框 */
.loader-spinner::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    width: calc(100% - 20px);
    height: calc(100% - 20px);
    border: 4px solid rgba(255, 255, 255, 0.15);
    border-bottom-color: #4DD0E1;
    border-left-color: #4DD0E1;
    border-radius: 50%;
    animation: spin-inner 1s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite reverse;
    box-shadow: 0 0 15px rgba(77, 208, 225, 0.4);
}

/* 外层旋转动画 */
@keyframes spin-outer {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* 内层反向旋转动画 */
@keyframes spin-inner {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(-360deg);
    }
}

/* 加载文字 - 增强版脉冲效果 */
.loader-text {
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-bold);
    margin: 0;
    letter-spacing: 2px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    animation: pulse-enhanced 1.5s ease-in-out infinite;
}

/* 增强版脉冲动画 - 带缩放效果 */
@keyframes pulse-enhanced {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.05);
    }
}

/* 加载点动画 */
.loader-text::after {
    content: '';
    animation: loading-dots 1.5s steps(4, end) infinite;
}

@keyframes loading-dots {
    0%, 20% {
        content: '';
    }
    40% {
        content: '.';
    }
    60% {
        content: '..';
    }
    80%, 100% {
        content: '...';
    }
}

/* ==================== 相对时间显示样式优化 ==================== */
.main-download-right {
    color: var(--text-secondary);
    font-size: var(--font-size-small);
    white-space: nowrap;
    margin-left: var(--spacing-md);
    transition: color var(--transition-fast);
}

.main-download-list a:hover .main-download-right {
    color: var(--primary-color);
}

/* 时间提示样式 */
.main-download-right[title] {
    cursor: help;
    border-bottom: 1px dotted var(--text-light);
}

/* ==================== 深色模式支持（可选） ==================== */
@media (prefers-color-scheme: dark) {
    /* 如果需要支持深色模式，可以在这里添加样式 */
}

/* ==================== 展开/收起按钮样式 ==================== */
/* ==================== 展开/收起按钮样式 ==================== */
.download-toggle-btn {
    display: none; /* 桌面端默认隐藏 */
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    /* 统一样式：初始状态和展开状态保持一致 */
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-md);
    color: var(--primary-color);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-base) var(--ease-in-out);
    position: relative;
    overflow: hidden;
}
.download-toggle-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-slow) var(--ease-in-out);
}

/* 统一hover效果：所有状态悬停时都变蓝色 */
.download-toggle-btn:hover {
    background: var(--primary-color) !important;
    color: var(--text-white) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-toggle-btn:hover::before {
    left: 100%;
}

.download-toggle-btn:hover .toggle-icon {
    stroke: var(--text-white) !important;
}

.download-toggle-btn:active {
    transform: translateY(0) scale(0.98);
}

/* 展开状态样式 - 与初始状态保持一致，无需额外样式 */
.download-toggle-btn.expanded {
    /* 继承初始状态的样式，无需重复定义 */
}

/* 展开/收起图标 */
.toggle-icon {
    flex-shrink: 0;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: all var(--transition-base) var(--ease-in-out);
}

/* 展开图标 - 默认在左侧 */
.toggle-icon-expand {
    order: -1;
}

/* 收起图标 - 也在左侧 */
.toggle-icon-collapse {
    order: -1;
}

.toggle-text {
    flex: 1;
    text-align: center;
    order: 0;
}

/* ==================== 响应式优化（移动端展开/收起功能） ==================== */
@media (max-width: 768px) {
    /* 移动端：显示展开按钮 */
    .download-toggle-btn {
        display: flex;
    }

    /* 下载列表默认收起 */
    .main-download-list {
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        margin-top: 0;
        transition: max-height var(--transition-base) var(--ease-in-out),
                    opacity var(--transition-base) var(--ease-in-out),
                    margin-top var(--transition-base) var(--ease-in-out);
    }

    /* 展开状态 */
    .main-download-list.expanded {
        max-height: 400px;
        overflow-y: auto;
        opacity: 1;
        margin-top: var(--spacing-md);
    }

    /* 左侧容器高度自适应 */
    .main-left {
        max-height: none;
        height: auto;
    }
}

@media (min-width: 769px) {
    /* 桌面端：隐藏展开按钮 */
    .download-toggle-btn {
        display: none !important;
    }

    /* 下载列表始终展开 */
    .main-download-list {
        max-height: none !important;
        overflow-y: auto;
        opacity: 1 !important;
    }
}

/* ==================== 减少动画（无障碍） ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}
/* ==================== 标题显示修复（最小化修复，不影响其他样式） ==================== */
/* 确保系统名称span可见 - 只修复显示问题，保留index-3.css的所有优化样式 */
.head h1.fl span,
.head h1 span,
.head.clearfix h1.fl span {
    display: inline-block !important;
    visibility: visible !important;
    opacity: 1 !important;
    text-indent: 0 !important;
    position: static !important;
    clip: auto !important;
    overflow: visible !important;
    height: auto !important;
    width: auto !important;
    max-width: none !important;
    max-height: none !important;
    min-width: 0 !important;
    min-height: 0 !important;
    transform: none !important;
    text-transform: none !important;
    word-spacing: normal !important;
}

/* 确保h1容器正常显示 - 兼容index-3.css的flex布局 */
.head h1.fl {
    display: flex !important;
    align-items: center;
}

/* 确保h1内的所有内容可见 */
.head h1.fl * {
    visibility: visible !important;
    opacity: 1 !important;
}

/* 确保图片正常显示 */
.head h1.fl img {
    display: inline-block !important;
    visibility: visible !important;
    opacity: 1 !important;
}