/**
 * 夜间怀旧模式
 * 深色系复古体验
 */

/* ==================== 夜间模式变量 ==================== */
body.night-mode {
    --primary: #1a1a2e;
    --secondary: #e94560;
    --accent: #ffc947;
    --bg: #16213e;
    --bg-dark: #0f0f23;
    --text: #eaeaea;
    --text-light: #a0a0a0;
    --card-bg: #1a1a2e;
    --glass: rgba(22, 33, 62, 0.9);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.5);
    --border: rgba(255, 255, 255, 0.1);
}

/* ==================== 夜间模式切换按钮 ==================== */
.night-mode-toggle {
    position: fixed;
    top: 75px;
    right: 20px;
    width: 50px;
    height: 26px;
    background: var(--bg-dark);
    border: 2px solid var(--accent);
    border-radius: 13px;
    cursor: pointer;
    z-index: 9999;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    padding: 2px;
}

.night-mode-toggle::before {
    content: '🌙';
    position: absolute;
    left: 4px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.night-mode-toggle::after {
    content: '';
    position: absolute;
    left: 2px;
    width: 18px;
    height: 18px;
    background: var(--accent);
    border-radius: 50%;
    transition: all 0.3s ease;
}

body.night-mode .night-mode-toggle {
    background: var(--accent);
    border-color: var(--bg-dark);
}

body.night-mode .night-mode-toggle::before {
    content: '☀️';
    left: 28px;
    color: var(--bg-dark);
}

body.night-mode .night-mode-toggle::after {
    left: 26px;
    background: var(--bg-dark);
}

/* ==================== 夜间模式过渡 ==================== */
body {
    transition: background 0.5s ease, color 0.5s ease;
}

/* 夜间模式全局背景 */
body.night-mode {
    background: var(--bg) !important;
}

/* 夜间模式卡片效果 */
body.night-mode .student-card,
body.night-mode .stat-card,
body.night-mode .recent-messages,
body.night-mode .timeline-section,
body.night-mode .profile-card,
body.night-mode .profile-detail-card,
body.night-mode .bento-card,
body.night-mode .news-card,
body.night-mode .polaroid-frame,
body.night-mode .carousel-item,
body.night-mode .message-stamp,
body.night-mode .gallery-item,
body.night-mode .video-card,
body.night-mode .activity-section {
    background: linear-gradient(145deg, #1a1a2e 0%, #16213e 100%) !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4) !important;
}

/* 夜间模式文字效果 */
body.night-mode .header-title,
body.night-mode .hero-title,
body.night-mode .section-title,
body.night-mode .timeline-year {
    color: var(--accent) !important;
    text-shadow: 0 0 10px rgba(255, 201, 71, 0.3);
}

body.night-mode .timeline-event,
body.night-mode .message-content,
body.night-mode .carousel-content {
    color: var(--text) !important;
}

/* 夜间模式胶片颗粒增强 */
body.night-mode .film-grain-overlay {
    opacity: 0.08;
    mix-blend-mode: overlay;
}

/* 夜间模式分隔线 */
body.night-mode .timeline::before {
    background: linear-gradient(to bottom, var(--secondary), var(--accent));
}

/* 夜间模式输入框 */
body.night-mode input,
body.night-mode textarea,
body.night-mode select {
    background: var(--bg-dark) !important;
    color: var(--text) !important;
    border-color: var(--border) !important;
}

/* 夜间模式滚动条 */
body.night-mode ::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

body.night-mode ::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--secondary), var(--accent));
}

/* 夜间模式底部导航 */
body.night-mode .bottom-tab-bar {
    background: rgba(22, 33, 62, 0.95) !important;
    border-top-color: rgba(255, 255, 255, 0.1);
}

body.night-mode .tab-item {
    color: var(--text-light) !important;
}

body.night-mode .tab-item.active {
    color: var(--accent) !important;
}

/* 夜间模式模态框 */
body.night-mode .modal {
    background: var(--bg) !important;
}

body.night-mode .modal-overlay {
    background: rgba(0, 0, 0, 0.8) !important;
}

/* 夜间模式标签栏 */
body.night-mode .media-tabs {
    background: var(--bg-dark);
}

body.night-mode .media-tab {
    color: var(--text-light);
}

body.night-mode .media-tab.active {
    color: var(--accent);
    background: var(--bg);
}

/* 夜间模式按钮 */
body.night-mode .btn-primary,
body.night-mode .submit-btn,
body.night-mode .verify-btn {
    background: linear-gradient(135deg, var(--secondary), var(--accent)) !important;
    color: #fff !important;
}

/* 夜间模式宝丽来效果 */
body.night-mode .polaroid-frame {
    background: #1a1a2e !important;
}

/* 夜间模式印章效果 */
body.night-mode .message-stamp {
    background: linear-gradient(145deg, #1a1a2e, #16213e) !important;
}

body.night-mode .message-stamp::before {
    border-color: var(--accent) !important;
}

/* 夜间模式新闻卡片 */
body.night-mode .news-card {
    background: linear-gradient(135deg, #1a1a2e, #16213e) !important;
}

body.night-mode .news-date-stamp {
    border-color: var(--accent) !important;
    color: var(--accent) !important;
}

/* 夜间模式顶部导航 */
body.night-mode .top-header {
    background: var(--glass) !important;
}

/* 夜间模式浮窗提示 */
body.night-mode .toast,
body.night-mode .flash-notification {
    background: linear-gradient(135deg, var(--secondary), var(--accent)) !important;
}

/* 夜间模式头像 */
body.night-mode .avatar-placeholder,
body.night-mode .avatar {
    background: var(--bg-dark) !important;
    color: var(--accent) !important;
}

/* 夜间模式最新动态区域 */
body.night-mode .latest-activities {
    background: linear-gradient(145deg, #1a1a2e 0%, #16213e 100%) !important;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4) !important;
}

body.night-mode .latest-activities .section-title {
    color: var(--accent) !important;
}

body.night-mode .activity-carousel {
    background: rgba(0, 0, 0, 0.3) !important;
    border-radius: 12px;
}

body.night-mode .carousel-item {
    background: linear-gradient(145deg, #1a1a2e 0%, #16213e 100%) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
}

body.night-mode .carousel-item:hover {
    background: linear-gradient(145deg, #252545 0%, #1a2540 100%) !important;
}

body.night-mode .type-tag {
    background: linear-gradient(135deg, var(--secondary), var(--accent)) !important;
    color: #fff !important;
}

body.night-mode .carousel-actor {
    color: var(--accent) !important;
}

body.night-mode .carousel-content {
    color: var(--text) !important;
}

body.night-mode .carousel-time {
    color: var(--text-light) !important;
}

body.night-mode .carousel-nav {
    background: rgba(0, 0, 0, 0.2) !important;
}

body.night-mode .carousel-btn {
    background: var(--bg-dark) !important;
    color: var(--accent) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
}

body.night-mode .carousel-btn:hover {
    background: var(--bg) !important;
}

body.night-mode .carousel-dots .dot {
    background: rgba(255, 255, 255, 0.3) !important;
}

body.night-mode .carousel-dots .dot.active {
    background: var(--accent) !important;
}

/* 夜间模式时光轴 */
body.night-mode .timeline-section {
    background: linear-gradient(145deg, #1a1a2e 0%, #16213e 100%) !important;
    border-radius: 16px;
    padding: 20px !important;
}

body.night-mode .timeline-year {
    color: var(--accent) !important;
}

body.night-mode .timeline-event {
    color: var(--text) !important;
    background: rgba(0, 0, 0, 0.3) !important;
    border-left: 3px solid var(--secondary) !important;
}

/* 夜间模式信封卡片 */
body.night-mode .envelope-card .envelope-body {
    background: linear-gradient(145deg, #1a1a2e 0%, #16213e 100%) !important;
}

body.night-mode .envelope-card .envelope-flap {
    background: linear-gradient(180deg, #252545 0%, #1a1a2e 100%) !important;
}

body.night-mode .envelope-card .letter-content {
    background: linear-gradient(to bottom, #16213e 0%, #1a1a2e 100%) !important;
}

body.night-mode .envelope-card .letter-nickname {
    color: var(--accent) !important;
}

body.night-mode .envelope-card .letter-text {
    color: var(--text) !important;
}

body.night-mode .envelope-card .letter-signature {
    color: var(--accent) !important;
}

body.night-mode .envelope-card .letter-actions {
    border-top-color: rgba(255, 255, 255, 0.1) !important;
}

body.night-mode .envelope-card .letter-like-btn,
body.night-mode .envelope-card .letter-comment-btn {
    border-color: var(--accent) !important;
    color: var(--text-light) !important;
}

body.night-mode .envelope-card .letter-like-btn:hover,
body.night-mode .envelope-card .letter-comment-btn:hover {
    background: rgba(243, 156, 18, 0.1) !important;
}

body.night-mode .envelope-card .expand-hint {
    color: var(--text-light) !important;
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    .night-mode-toggle {
        top: 70px;
        right: 10px;
        width: 44px;
        height: 24px;
    }

    .night-mode-toggle::before {
        font-size: 0.8rem;
    }

    body.night-mode .night-mode-toggle::before {
        left: 24px;
    }

    body.night-mode .night-mode-toggle::after {
        left: 22px;
    }
}