/* 主题变量 */
:root {
    /* 亮色主题变量 */
    --primary-color: #4361ee;
    --text-color: #333;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
    --accent-color: #f72585;
    --border-color: #e9ecef;
}

.dark-theme {
    /* 暗色主题变量 */
    --primary-color: #4895ef;
    --text-color: #f8f9fa;
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
    --accent-color: #b5179e;
    --border-color: #343a40;
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
}

body {
    min-height: 100vh;
    color: var(--text-color);
    background-image: url('https://tse1-mm.cn.bing.net/th/id/OIP-C.0ljqwoYBob70QUmzDohTqgAAAA?dpr=2.7&pid=ImgDetMain');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    overflow-x: hidden;
    padding: 20px;
    transition: background 0.5s ease, color 0.5s ease, opacity 0.5s ease;
    position: relative;
    opacity: 0;
    animation: fadeInBody 1.2s ease forwards;
}

@keyframes fadeInBody {
    to {
        opacity: 1;
    }
}

/* 手机端背景 - 使用新链接 */
@media (max-width: 768px) {
    body {
        background-image: url('https://img.wjwj.top/2025/06/24/32a54bd7df274fae4baf9bb2be7af414.jpeg');
        background-size: cover;
        background-position: center;
    }
}

/* 添加半透明覆盖层增强文本可读性 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.2);
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 80px;
    padding-bottom: 40px;
}

/* =============================== */
/* 增强卡片毛玻璃效果 */
/* =============================== */
/* 通用卡片模糊效果 */
.glass-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    transform: translateY(20px);
    opacity: 0;
    animation: cardAppear 0.8s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
    animation-delay: calc(var(--card-order) * 0.1s);
}

@keyframes cardAppear {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 应用于所有卡片元素 */
.instructions, .glass-container, .photo-item, .student-card, .timeline-content, .speech-item, .comment-form, .roster-container .student-card, .photo-grid .photo-item {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow);
    transform: translateY(20px);
    opacity: 0;
    animation: cardAppear 0.8s cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
    animation-delay: calc(var(--card-order) * 0.1s);
}

/* 调整特定元素的透明度 */
.instructions {
    background: rgba(255, 255, 255, 0.15);
}

.student-card {
    background: rgba(255, 255, 255, 0.12);
}

.speech-item {
    background: rgba(255, 255, 255, 0.15);
    animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.comment-form {
    background: rgba(255, 255, 255, 0.15);
}

/* 卡片悬停效果增强 */
.glass-card:hover, .instructions:hover, .glass-container:hover, .photo-item:hover, .student-card:hover, .timeline-content:hover, .speech-item:hover, .comment-form:hover {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transform: translateY(-5px);
}

/* =============================== */
/* 原有样式保留 */
/* =============================== */
/* 主题切换按钮 */
.theme-switch {
    position: fixed;
    top: 60px;
    right: 20px;
    z-index: 2000;
    cursor: move;
    user-select: none;
    transition: transform 0.2s ease;
}

.theme-switch.dragging {
    cursor: grabbing;
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
}

.theme-switch button {
    background: var(--card-bg);
    color: var(--text-color);
    border: none;
    border-radius: 30px;
    padding: 12px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    font-weight: 500;
    font-size: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.theme-switch button:hover {
    background: var(--accent-color);
    color: #fff;
    transform: translateY(-2px);
}

.theme-switch button:active {
    transform: translateY(1px);
}

.instructions {
    border-radius: 12px;
    padding: 25px;
    max-width: 600px;
    margin: 20px auto 40px;
}

.instructions h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.instructions ul {
    padding-left: 20px;
}

.instructions li {
    margin: 12px 0;
    line-height: 1.6;
    color: var(--text-color);
}

.footer {
    margin-top: auto;
    padding: 20px;
    text-align: center;
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2.2rem;
    }
    .content {
        flex-direction: column;
        align-items: center;
    }
    .theme-switch {
        top: 20px;
        right: 20px;
    }
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(12px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 25px;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
}

/* 修复黑夜模式登录按钮可见性问题 */
[data-theme="dark"] .nav-links a#authBtn {
    color: var(--accent-color);
    background: rgba(255, 215, 0, 0.1);
    padding: 5px 10px;
    border-radius: 5px;
}

.nav-links a.active, .nav-links a:hover {
    color: var(--accent-color);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s;
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 1.5rem;
    cursor: pointer;
}

/* 毛玻璃效果容器 */
.glass-container {
    border-radius: 20px;
    padding: 30px;
    margin: 20px 0;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

/* 头部样式 */
header {
    text-align: center;
    padding: 40px 20px;
    position: relative;
    margin-top: 20px;
}

.school-logo {
    width: 120px;
    height: 120px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 50px;
    color: var(--text-light);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
}

h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    background: linear-gradient(to right, var(--accent-color), #ffffff, var(--accent-color));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    letter-spacing: 2px;
}

.subtitle {
    font-size: 1.6rem;
    margin-bottom: 20px;
    color: #e0e0ff;
}

.class-info {
    font-size: 1.3rem;
    color: var(--accent-color);
    margin-top: 10px;
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

/* 视频播放器区域 - 增强适配性 */
.video-section {
    margin: 40px 0;
    text-align: center;
    position: relative;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    padding-top: 56.25%;
}

#graduationVideo {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* 视频覆盖层样式 */
.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    border-radius: 20px;
    transition: opacity 0.3s ease;
}

.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.video-overlay i {
    font-size: 60px;
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s, color 0.3s;
    margin-bottom: 15px;
}

.video-overlay:hover i {
    transform: scale(1.1);
    color: var(--accent-color);
}

.video-title {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
    max-width: 90%;
    margin-top: 10px;
}

.video-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.7);
    max-width: 90%;
}

/* 视频控制条样式 */
.video-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 20;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.video-container:hover .video-controls {
    transform: translateY(0);
}

.control-btn {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1.2rem;
    padding: 5px 10px;
    transition: color 0.3s, transform 0.3s;
}

.control-btn:hover {
    color: var(--accent-color);
    transform: translateY(-3px) scale(1.03);
}

.progress-container {
    flex-grow: 1;
    margin: 0 15px;
    height: 5px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
}

.progress-bar {
    height: 100%;
    background: var(--accent-color);
    border-radius: 3px;
    width: 0%;
}

.time-display {
    color: white;
    font-size: 0.9rem;
    min-width: 80px;
    text-align: center;
}

.volume-container {
    display: flex;
    align-items: center;
    margin-left: 10px;
}

.volume-slider {
    width: 80px;
    margin-left: 5px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .video-container {
        border-radius: 15px;
        max-width: 100%;
    }
    .video-overlay i {
        font-size: 40px;
    }
    .video-title {
        font-size: 1.2rem;
    }
    .video-subtitle {
        font-size: 0.9rem;
    }
    .control-btn {
        font-size: 1rem;
        padding: 3px 7px;
    }
    .time-display {
        font-size: 0.8rem;
        min-width: 70px;
    }
    .volume-slider {
        width: 60px;
    }
    .video-controls {
        padding: 8px;
    }
}

@media (max-width: 480px) {
    .video-overlay i {
        font-size: 35px;
    }
    .video-title {
        font-size: 1.1rem;
    }
    .video-controls {
        flex-wrap: wrap;
        padding: 5px;
    }
    .progress-container {
        order: 1;
        width: 100%;
        margin: 5px 0;
    }
    .time-display {
        min-width: 60px;
        font-size: 0.75rem;
    }
    .volume-container {
        margin-left: auto;
    }
}

/* 页面加载动画 */
body:not(.loaded) * {
    animation: none !important;
    transition: none !important;
}

/* 照片墙 */
.gallery-section {
    margin: 50px 0;
}

.section-title {
    text-align: center;
    font-size: 2.3rem;
    margin-bottom: 30px;
    color: var(--accent-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 100px;
    height: 4px;
    background: linear-gradient(to right, transparent, var(--accent-color), transparent);
    margin: 10px auto;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 20px;
}

.photo-item {
    border-radius: 15px;
    overflow: hidden;
    height: 280px;
    position: relative;
    transition: transform 0.3s ease;
}

.photo-item:hover {
    transform: translateY(-10px) scale(1.03);
    z-index: 2;
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.photo-item:hover img {
    transform: scale(1.1);
}

.photo-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
}

.photo-caption {
    position: absolute;
    bottom: 15px;
    left: 15px;
    color: white;
    font-weight: bold;
    z-index: 1;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

/* 班级通讯录 */
.roster-section {
    margin: 50px 0;
}

.roster-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.student-card {
    border-radius: 15px;
    padding: 20px;
    display: flex;
    align-items: center;
    transition: transform 0.3s ease;
}

.student-card.male {
    border-left: 4px solid #3498db;
}

.student-card.female {
    border-left: 4px solid #e84393;
}

.student-card:hover {
    transform: translateY(-5px);
}

.student-avatar {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background: rgba(255, 215, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-right: 15px;
    flex-shrink: 0;
    color: var(--text-light);
}

.student-info {
    flex-grow: 1;
}

.student-name {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 5px;
    color: var(--accent-color);
}

.student-contact {
    display: flex;
    align-items: center;
    margin-top: 8px;
    font-size: 0.95rem;
}

.student-contact i {
    width: 20px;
    color: var(--accent-color);
    margin-right: 8px;
}

/* 时间线 */
.timeline-section {
    margin: 50px 0;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 4px;
    background: rgba(255, 215, 0, 0.6);
    left: 50%;
    margin-left: -2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 60px;
    width: 100%;
}

.timeline-item:nth-child(odd) {
    padding-right: 50%;
}

.timeline-item:nth-child(even) {
    padding-left: 50%;
}

.timeline-content {
    padding: 20px;
    border-radius: 15px;
    position: relative;
}

.timeline-content h3 {
    color: var(--accent-color);
    margin-bottom: 10px;
}

.timeline-content::before {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    top: 20px;
}

.timeline-item:nth-child(odd) .timeline-content::before {
    right: -10px;
    transform: translateX(50%);
}

.timeline-item:nth-child(even) .timeline-content::before {
    left: -10px;
    transform: translateX(-50%);
}

/* 毕业感言 */
.comments-section {
    margin: 50px 0;
}

.speech-container {
    max-width: 800px;
    margin: 0 auto 40px;
}

.speech-item {
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    animation: fadeIn 0.6s ease forwards;
    opacity: 0;
    transform: translateY(20px);
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.speech-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.speech-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    color: var(--primary-color);
    font-weight: bold;
}

.speech-author {
    font-weight: bold;
    color: var(--accent-color);
}

.speech-date {
    margin-left: auto;
    font-size: 0.9rem;
    color: #888;
}

.speech-content {
    line-height: 1.6;
}

.comment-form {
    max-width: 800px;
    margin: 0 auto;
    padding: 25px;
    border-radius: 15px;
}

.comment-form h3 {
    margin-bottom: 15px;
    color: var(--accent-color);
}

.comment-form textarea {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    border-radius: 10px;
    border: 1px solid rgba(255, 215, 0, 0.3);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
    font-size: 1rem;
    margin-bottom: 15px;
    resize: vertical;
    transition: var(--transition);
}

.comment-form textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    background: rgba(255, 255, 255, 0.15);
}

.comment-form button {
    background: var(--accent-color);
    color: var(--primary-color);
    border: none;
    padding: 12px 25px;
    border-radius: 30px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    display: block;
    margin-left: auto;
}

.comment-form button:hover {
    background: #ffdf40;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.login-prompt {
    text-align: center;
    margin-top: 15px;
    color: #888;
}

.login-prompt a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: bold;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 30px;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.7);
    background: rgba(0, 0, 0, 0.3);
    border-radius: 20px;
    margin-top: 60px;
}

/* 响应式设计 - 重点修复手机菜单 */
@media (max-width: 768px) {
    .container {
        padding: 70px 15px 30px;
    }
    h1 {
        font-size: 2.5rem;
    }
    .subtitle {
        font-size: 1.3rem;
    }
    .class-info {
        font-size: 1.1rem;
    }
    .section-title {
        font-size: 1.8rem;
    }
    .timeline::before {
        left: 30px;
    }
    .timeline-item:nth-child(odd), .timeline-item:nth-child(even) {
        padding: 0;
        padding-left: 70px;
    }
    .timeline-content::before {
        left: 20px;
        transform: translateX(-50%);
    }
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(26, 42, 108, 0.85);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: center;
        padding: 20px 0;
        gap: 15px;
        transform: translateY(-150%);
        transition: transform 0.4s ease;
        border-radius: 0 0 15px 15px;
        box-shadow:  0 10px 25px rgba(0, 0, 0, 0.2);
    }
    .nav-links.active {
        transform: translateY(0);
    }
    .nav-toggle {
        display: block;
    }
    .roster-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: 15px;
    }
    .glass-container {
        padding: 20px;
        border-radius: 18px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }
    .subtitle {
        font-size: 1.1rem;
    }
    .section-title {
        font-size: 1.6rem;
    }
    .glass-container {
        padding: 20px 15px;
    }
    .photo-grid {
        grid-template-columns: 1fr;
    }
    .student-card {
        padding: 15px;
    }
    .student-avatar {
        width: 60px;
        height: 60px;
        font-size: 20px;
    }
    .theme-switch button span {
        display: none;
    }
}

/* ============== 页面跳转动画 ============== */
.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 9999;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.transition-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #4361ee, #3a0ca3);
    transform: translateY(100%);
    animation: slideIn 0.6s cubic-bezier(0.65, 0, 0.35, 1);
}

.transition-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    opacity: 0;
    animation: fadeIn 0.6s 0.3s cubic-bezier(0.65, 0, 0.35, 1) forwards;
}

.transition-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.transition-content .loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes slideIn {
    0% {
        transform: translateY(100%);
    }
    100% {
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    0% {
        opacity: 0;
        transform: translateY(20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

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