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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-color, #0f0c29);
    background: linear-gradient(135deg, var(--bg-color, #0f0c29) 0%, #302b63 50%, #24243e 100%);
    min-height: 100vh;
    color: #fff;
    overflow-x: hidden;
}

/* 前台背景图 */
body.front-page {
    background-image: var(--bg-pc);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
}
body.front-page::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(15,12,41,0.75) 0%, rgba(48,43,99,0.65) 50%, rgba(36,36,62,0.75) 100%);
    z-index: 0;
    pointer-events: none;
}

/* 平板端背景图 */
@media (max-width: 1024px) and (min-width: 769px) {
    body.front-page {
        background-image: var(--bg-tablet);
    }
}

/* 手机端背景图 */
@media (max-width: 768px) {
    body.front-page {
        background-image: var(--bg-mobile);
        background-attachment: scroll;
    }
}

.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(79, 195, 247, 0.1) 0%, transparent 50%);
    animation: bgFloat 15s ease-in-out infinite;
    z-index: 0;
    pointer-events: none;
}

@keyframes bgFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.container {
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
}

.title {
    font-size: 2.5em;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    animation: fadeInDown 0.8s ease;
}

.subtitle {
    font-size: 1.1em;
    color: rgba(255, 255, 255, 0.7);
    animation: fadeInDown 0.8s ease 0.2s both;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.page-tab {
    padding: 10px 24px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    color: #fff;
    text-decoration: none;
    font-size: 0.95em;
    transition: all 0.3s ease;
}

.page-tab:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.page-tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.buttons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 50px;
    animation: fadeInUp 0.8s ease 0.4s both;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.btn-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px 20px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    text-decoration: none;
    color: #fff;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--btn-color, #667eea);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.btn-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.12);
    border-color: var(--btn-color, #667eea);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.btn-card:hover::before {
    transform: scaleX(1);
}

.btn-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--btn-color, #667eea), rgba(255,255,255,0.2));
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
    font-size: 1.5em;
    transition: transform 0.3s ease;
}

.btn-card:hover .btn-icon {
    transform: scale(1.1) rotate(5deg);
}

.btn-name {
    font-size: 1em;
    font-weight: 500;
    text-align: center;
}

.empty-tip {
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    padding: 40px;
    grid-column: 1 / -1;
}

.video-section {
    margin-bottom: 50px;
    animation: fadeInUp 0.8s ease 0.5s both;
}

/* 视频入口卡片 */
.video-entry-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 25px 30px;
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    text-decoration: none;
    color: #fff;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.video-entry-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(135deg, #667eea, #764ba2);
}
.video-entry-card:hover {
    transform: translateY(-3px);
    background: rgba(255, 255, 255, 0.12);
    border-color: #667eea;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}
.video-entry-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8em;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}
.video-entry-card:hover .video-entry-icon {
    transform: scale(1.1);
}
.video-entry-info {
    flex: 1;
}
.video-entry-title {
    font-size: 1.3em;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.video-entry-desc {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9em;
}
.video-entry-arrow {
    font-size: 1.2em;
    color: rgba(255, 255, 255, 0.5);
    transition: transform 0.3s ease;
}
.video-entry-card:hover .video-entry-arrow {
    transform: translateX(5px);
    color: #667eea;
}

/* 返回按钮 */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    color: #fff;
    text-decoration: none;
    font-size: 0.9em;
    transition: all 0.3s ease;
}
.back-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(-3px);
}

.section-title {
    font-size: 1.4em;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: #667eea;
}

.video-wrapper {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    margin-bottom: 15px;
}

.video-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.video-item {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    color: #fff;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s ease;
}

.video-item:hover, .video-item.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-color: transparent;
}

.footer {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9em;
}

.admin-link {
    color: rgba(255, 255, 255, 0.4);
    text-decoration: none;
    margin-left: 15px;
}

.admin-link:hover {
    color: #667eea;
}

.music-player {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 100;
}

.music-btn {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    color: #fff;
    font-size: 1.2em;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
}

.music-btn:hover {
    transform: scale(1.1);
}

.music-btn.playing {
    animation: musicPulse 1.5s ease-in-out infinite;
}

@keyframes musicPulse {
    0%, 100% { box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4); }
    50% { box-shadow: 0 4px 25px rgba(102, 126, 234, 0.8); }
}

/* 登录页 */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.login-box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    animation: fadeInUp 0.5s ease;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.5em;
}

.error-msg {
    background: rgba(229, 115, 115, 0.2);
    color: #ffcdd2;
    padding: 10px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
}

.login-tip {
    text-align: center;
    margin-top: 15px;
    font-size: 0.85em;
    color: rgba(255, 255, 255, 0.5);
}

/* 表单通用 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9em;
    color: rgba(255, 255, 255, 0.8);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    color: #fff;
    font-size: 0.95em;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.15);
}

.form-group input[type="color"] {
    height: 45px;
    padding: 5px;
    cursor: pointer;
}

.btn-submit {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 1em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

/* 后台 */
.admin-body {
    background: #f0f2f5;
    color: #333;
}

.admin-container {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 240px;
    background: #1a1a2e;
    color: #fff;
    padding: 20px 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.admin-sidebar h2 {
    padding: 0 20px 20px;
    font-size: 1.2em;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 20px;
}

.admin-nav {
    display: flex;
    flex-direction: column;
}

.admin-nav a {
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.admin-nav a:hover, .admin-nav a.active {
    background: rgba(102, 126, 234, 0.2);
    color: #fff;
}

.back-link, .logout-link {
    display: block;
    padding: 12px 20px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    margin-top: 10px;
}

.back-link:hover, .logout-link:hover {
    color: #667eea;
}

.logout-link {
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: 20px;
}

.admin-main {
    margin-left: 240px;
    padding: 30px;
    flex: 1;
    background: #f0f2f5;
    min-height: 100vh;
}

.admin-main h3 {
    margin-bottom: 25px;
    color: #1a1a2e;
    font-size: 1.5em;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #c3e6cb;
}

.admin-card {
    background: #fff;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.admin-card h4 {
    margin-bottom: 15px;
    color: #1a1a2e;
}

.admin-form .form-group label {
    color: #555;
}

.admin-form .form-group input,
.admin-form .form-group select {
    background: #f8f9fa;
    border: 1px solid #ddd;
    color: #333;
}

.admin-form .form-group input:focus,
.admin-form .form-group select:focus {
    background: #fff;
    border-color: #667eea;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

.form-inline {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    flex-wrap: wrap;
}

.form-inline input {
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 0.9em;
}

.form-inline .btn-submit {
    width: auto;
    padding: 10px 20px;
}

.admin-table {
    width: 100%;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-collapse: collapse;
}

.admin-table th {
    background: #1a1a2e;
    color: #fff;
    padding: 12px 15px;
    text-align: left;
    font-size: 0.9em;
}

.admin-table td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
    font-size: 0.9em;
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.admin-table tr:hover {
    background: #f8f9fa;
}

.btn-small {
    padding: 5px 12px;
    background: #667eea;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85em;
    text-decoration: none;
    display: inline-block;
    margin-right: 5px;
}

.btn-small:hover {
    background: #5568d3;
}

.btn-delete {
    padding: 5px 12px;
    background: #e57373;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85em;
}

.btn-delete:hover {
    background: #d32f2f;
}

.btn-cancel {
    padding: 12px 20px;
    background: #9e9e9e;
    color: #fff;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    margin-left: 10px;
}

.btn-cancel:hover {
    background: #757575;
}

/* 响应式 */
@media (max-width: 768px) {
    .title { font-size: 1.8em; }
    .buttons-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 15px; }
    .btn-card { padding: 20px 15px; }
    .btn-icon { width: 50px; height: 50px; font-size: 1.2em; }
    
    .admin-container { flex-direction: column; }
    .admin-sidebar { width: 100%; height: auto; position: relative; }
    .admin-main { margin-left: 0; padding: 20px; }
    .form-row { flex-direction: column; gap: 0; }
}

/* 访问统计 */
.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}
.stat-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    backdrop-filter: blur(10px);
}
.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: #667eea;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.3em;
    flex-shrink: 0;
}
.stat-value {
    font-size: 1.8em;
    font-weight: bold;
    color: #fff;
    line-height: 1.2;
}
.stat-label {
    font-size: 0.85em;
    color: #aaa;
    margin-top: 4px;
}
#chinaMap, #trendChart {
    background: rgba(255,255,255,0.02);
    border-radius: 8px;
}

/* ========== Safari & 移动端兼容 ========== */
* {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}
body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
.bg-animation {
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    will-change: transform;
}
.btn-card, .stat-card, .admin-card {
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}
/* iOS安全区域适配 */
@supports (padding: max(0px)) {
    .container {
        padding-left: max(20px, env(safe-area-inset-left));
        padding-right: max(20px, env(safe-area-inset-right));
        padding-bottom: max(20px, env(safe-area-inset-bottom));
    }
}
/* 移动端视频播放器适配 */
#dplayer {
    max-width: 100%;
}
/* 防止iOS输入框缩放 */
input, select, textarea {
    font-size: 16px;
}

/* ========== 平板适配 (769px - 1024px) ========== */
@media (max-width: 1024px) and (min-width: 769px) {
    .container { max-width: 90%; padding: 30px 20px; }
    .title { font-size: 2.2em; }
    .buttons-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 18px; }
    .btn-card { padding: 25px 18px; }
    .btn-icon { width: 55px; height: 55px; font-size: 1.4em; }
    .admin-sidebar { width: 200px; }
    .admin-main { margin-left: 200px; padding: 25px; }
    .stats-cards { grid-template-columns: repeat(2, 1fr); }
}

/* ========== 手机适配 (≤768px) ========== */
@media (max-width: 768px) {
    .container { max-width: 100%; padding: 20px 15px; }
    .title { font-size: 1.6em; }
    .subtitle { font-size: 0.9em; }
    .header { margin-bottom: 20px; }
    .page-tabs { 
        display: flex; 
        overflow-x: auto; 
        flex-wrap: nowrap; 
        -webkit-overflow-scrolling: touch;
        padding-bottom: 5px;
        gap: 8px;
    }
    .page-tab { 
        flex-shrink: 0; 
        padding: 8px 16px; 
        font-size: 0.9em;
    }
    .buttons-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .btn-card { padding: 18px 12px; }
    .btn-icon { width: 45px; height: 45px; font-size: 1.1em; }
    .btn-name { font-size: 0.85em; }
    .section-title { font-size: 1.1em; }
    .video-wrapper { border-radius: 10px; }
    .video-list { flex-direction: column; }
    .video-item { width: 100%; }
    .footer { flex-direction: column; gap: 10px; text-align: center; }
    .music-player { bottom: 15px; right: 15px; }
    .music-btn { width: 45px; height: 45px; font-size: 1em; }
    
    /* 后台移动端 */
    .admin-container { flex-direction: column; }
    .admin-sidebar { width: 100%; height: auto; position: relative; padding: 15px; }
    .admin-sidebar h2 { font-size: 1.2em; margin-bottom: 10px; }
    .admin-nav { display: flex; flex-wrap: wrap; gap: 5px; }
    .admin-nav a { padding: 8px 12px; font-size: 0.85em; flex: 1; text-align: center; }
    .back-link, .logout-link { display: inline-block; margin-top: 10px; }
    .admin-main { margin-left: 0; padding: 15px; }
    .admin-main h3 { font-size: 1.2em; }
    .form-row { flex-direction: column; gap: 0; }
    .admin-table { font-size: 0.8em; display: block; overflow-x: auto; }
    .admin-table th, .admin-table td { padding: 8px 6px; white-space: nowrap; }
    .stats-cards { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .stat-card { padding: 15px; gap: 10px; }
    .stat-icon { width: 40px; height: 40px; font-size: 1em; }
    .stat-value { font-size: 1.4em; }
    .stat-label { font-size: 0.75em; }
    #chinaMap { height: 350px; }
    #trendChart { height: 250px; }
    .login-box { width: 90%; max-width: 350px; padding: 25px 20px; }
}

/* ========== 小屏手机 (≤480px) ========== */
@media (max-width: 480px) {
    .title { font-size: 1.4em; }
    .buttons-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .btn-card { padding: 15px 10px; }
    .btn-icon { width: 40px; height: 40px; font-size: 1em; }
    .btn-name { font-size: 0.8em; }
    .stats-cards { grid-template-columns: 1fr; }
    #chinaMap { height: 300px; }
}

/* ========== 横屏手机优化 ========== */
@media (max-height: 500px) and (orientation: landscape) {
    .container { padding: 15px; }
    .header { margin-bottom: 15px; }
    .title { font-size: 1.4em; }
    .buttons-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; }
    .btn-card { padding: 12px 10px; }
    .btn-icon { width: 38px; height: 38px; font-size: 0.9em; }
}

/* ========== 公告弹窗 ========== */
.announcement-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: 10000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}
.announcement-box {
    background: linear-gradient(135deg, rgba(30, 30, 60, 0.98), rgba(20, 20, 45, 0.98));
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    max-width: 450px;
    width: 100%;
    overflow: hidden;
    animation: announcementPop 0.3s ease;
}
@keyframes announcementPop {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.announcement-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
}
.announcement-header h3 {
    margin: 0;
    color: #fff;
    font-size: 1.1em;
    display: flex;
    align-items: center;
    gap: 8px;
}
.announcement-header h3 i {
    color: #ffd54f;
}
.announcement-close {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    font-size: 1.1em;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all 0.2s;
}
.announcement-close:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}
.announcement-content {
    padding: 22px;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.8;
    font-size: 0.95em;
    max-height: 300px;
    overflow-y: auto;
}
.announcement-ok {
    display: block;
    width: calc(100% - 44px);
    margin: 0 22px 22px;
    padding: 12px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}
.announcement-ok:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

/* ========== Footer增强 ========== */
.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}
.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    font-size: 0.85em;
    transition: color 0.2s;
}
.footer-links a:hover {
    color: #667eea;
}
.footer-stats {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8em;
    margin-bottom: 8px;
}
.footer-stats .stats-divider {
    margin: 0 8px;
    opacity: 0.5;
}

/* ========== 内容卡片（二级页面通用） ========== */
.content-card {
    background: rgba(20, 20, 40, 0.7);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 35px;
    margin-bottom: 20px;
}
.section-title {
    color: #fff;
    font-size: 1.5em;
    margin: 0 0 25px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.section-title i {
    color: #667eea;
}
.empty-tip {
    text-align: center;
    padding: 50px 20px;
    color: rgba(255, 255, 255, 0.4);
    font-size: 1em;
}

/* ========== 更新日志 ========== */
.changelog-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}
.changelog-item {
    background: rgba(255, 255, 255, 0.05);
    border-left: 4px solid #667eea;
    border-radius: 0 12px 12px 0;
    padding: 22px 25px;
    transition: all 0.3s;
}
.changelog-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-left-color: #764ba2;
    transform: translateX(5px);
}
.changelog-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 12px;
}
.changelog-version {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    padding: 5px 14px;
    border-radius: 14px;
    font-size: 0.9em;
    font-weight: 600;
}
.changelog-date {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.95em;
}
.changelog-title {
    color: #fff;
    font-size: 1.25em;
    margin: 0 0 12px;
    font-weight: 600;
}
.changelog-content {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.9;
    font-size: 1.05em;
}

/* ========== FAQ折叠面板 ========== */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.faq-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s;
}
.faq-item:hover {
    border-color: rgba(102, 126, 234, 0.4);
}
.faq-item.active {
    border-color: rgba(102, 126, 234, 0.6);
    background: rgba(102, 126, 234, 0.1);
}
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    cursor: pointer;
    color: #fff;
    font-size: 1.1em;
    font-weight: 500;
    user-select: none;
}
.faq-question i:first-child {
    color: #667eea;
    margin-right: 10px;
    font-size: 1.1em;
}
.faq-arrow {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9em;
    transition: transform 0.3s;
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    padding: 0 25px;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.9;
    font-size: 1.05em;
}
.faq-item.active .faq-answer {
    padding-bottom: 22px;
}

/* ========== 手机端适配 ========== */
@media (max-width: 768px) {
    .content-card { padding: 20px 15px; }
    .section-title { font-size: 1.25em; margin-bottom: 18px; }
    .announcement-box { max-width: 100%; }
    .announcement-content { max-height: 250px; }
    .footer-links { gap: 15px; }
    .changelog-item { padding: 18px; }
    .changelog-title { font-size: 1.1em; }
    .changelog-content { font-size: 0.95em; }
    .faq-question { padding: 16px 18px; font-size: 1em; }
    .faq-answer { font-size: 0.95em; padding: 0 18px; }
    .faq-item.active .faq-answer { padding-bottom: 18px; }
}

/* ========== 图标选择器 ========== */
.icon-selector {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 8px;
}
.icon-selected-preview {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.08);
    padding: 8px 15px;
    border-radius: 8px;
    min-width: 120px;
}
.icon-selected-preview i {
    font-size: 1.4em;
    color: #667eea;
}
.icon-selected-preview span {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85em;
    font-family: monospace;
}
.btn-toggle-icons {
    background: rgba(102, 126, 234, 0.2);
    border: 1px solid rgba(102, 126, 234, 0.4);
    color: #fff;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s;
}
.btn-toggle-icons:hover {
    background: rgba(102, 126, 234, 0.4);
}
.icon-grid {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    gap: 6px;
    background: rgba(0, 0, 0, 0.3);
    padding: 12px;
    border-radius: 10px;
    max-height: 250px;
    overflow-y: auto;
    margin-top: 8px;
}
.icon-item {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 45px;
    border-radius: 6px;
    cursor: pointer;
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.1em;
    transition: all 0.2s;
}
.icon-item:hover {
    background: rgba(102, 126, 234, 0.4);
    color: #fff;
    transform: scale(1.15);
}

/* ========== 前台按钮自定义图标 ========== */
.btn-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

/* ========== 视频页返回按钮（明显版） ========== */
.back-btn-prominent {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    padding: 12px 24px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1em;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    transition: all 0.3s;
    margin-bottom: 20px;
}
.back-btn-prominent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}
.back-btn-prominent i {
    font-size: 1.1em;
}