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

/* 开场画面样式 */
.splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, #1a2332 0%, #34495e 50%, #2c3e50 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10000;
    overflow: hidden;
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.splash-screen .gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(40px);
    opacity: 0.6;
    animation: float 6s ease-in-out infinite;
}

.gradient-orb.orb-1 {
    width: 300px;
    height: 300px;
    background: linear-gradient(45deg, #3498db, #2ecc71);
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.gradient-orb.orb-2 {
    width: 200px;
    height: 200px;
    background: linear-gradient(45deg, #e74c3c, #f39c12);
    top: 60%;
    right: 15%;
    animation-delay: 2s;
}

.gradient-orb.orb-3 {
    width: 150px;
    height: 150px;
    background: linear-gradient(45deg, #9b59b6, #8e44ad);
    bottom: 20%;
    left: 50%;
    animation-delay: 4s;
}

.floating-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-particles .particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: particleFloat 8s linear infinite;
}

.floating-particles .particle:nth-child(1) {
    left: 20%;
    animation-delay: 0s;
    animation-duration: 6s;
}

.floating-particles .particle:nth-child(2) {
    left: 40%;
    animation-delay: 1s;
    animation-duration: 8s;
}

.floating-particles .particle:nth-child(3) {
    left: 60%;
    animation-delay: 2s;
    animation-duration: 7s;
}

.floating-particles .particle:nth-child(4) {
    left: 80%;
    animation-delay: 3s;
    animation-duration: 9s;
}

.floating-particles .particle:nth-child(5) {
    left: 10%;
    animation-delay: 4s;
    animation-duration: 5s;
}

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100px) rotate(360deg);
        opacity: 0;
    }
}

.splash-title {
    font-size: 48px;
    font-weight: 900;
    color: #ffffff;
    text-align: center;
    margin-bottom: 20px;
    text-shadow: 0 0 30px rgba(52, 152, 219, 0.8);
    animation: slideInLeft 1.5s ease-out;
}

.splash-subtitle {
    font-size: 32px;
    font-weight: 700;
    color: #ecf0f1;
    text-align: center;
    margin-bottom: 15px;
    text-shadow: 0 0 20px rgba(46, 204, 113, 0.6);
    animation: slideInRight 1.5s ease-out;
}

.splash-description {
    font-size: 18px;
    color: #bdc3c7;
    text-align: center;
    margin-bottom: 40px;
    animation: fadeInUp 2s ease-out;
}

.enter-button {
    background: linear-gradient(135deg, #3498db, #2ecc71);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.3);
    animation: bounceIn 2.5s ease-out;
    z-index: 20;
}

.enter-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(52, 152, 219, 0.4);
}

.enter-button .button-glow {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.enter-button:hover .button-glow {
    left: 100%;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.splash-screen.fade-out {
    opacity: 0;
    transform: scale(1.1);
}

.splash-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.splash-background::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 70%, rgba(74, 144, 226, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 30%, rgba(80, 200, 120, 0.1) 0%, transparent 50%);
    animation: backgroundShift 20s ease-in-out infinite;
}

@keyframes backgroundShift {
    0%, 100% { transform: rotate(0deg) scale(1); }
    50% { transform: rotate(180deg) scale(1.1); }
}

/* 动态粒子效果 */
.animated-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    background-size: 100px 100px;
    animation: sparkle 6s linear infinite;
}

@keyframes sparkle {
    0%, 100% { opacity: 0.3; transform: translateY(0px); }
    50% { opacity: 0.8; transform: translateY(-20px); }
}

/* 浮动元素 */
.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
}

.float-element {
    position: absolute;
    width: 20px;
    height: 20px;
    background: linear-gradient(45deg, rgba(74, 144, 226, 0.3), rgba(80, 200, 120, 0.3));
    border-radius: 50%;
    animation: float 8s ease-in-out infinite;
}

.float-element:nth-child(1) {
    top: 20%;
    left: 10%;
    animation-delay: 0s;
    animation-duration: 6s;
}

.float-element:nth-child(2) {
    top: 60%;
    left: 80%;
    animation-delay: 2s;
    animation-duration: 8s;
}

.float-element:nth-child(3) {
    top: 80%;
    left: 20%;
    animation-delay: 4s;
    animation-duration: 7s;
}

.float-element:nth-child(4) {
    top: 30%;
    left: 70%;
    animation-delay: 1s;
    animation-duration: 9s;
}

.float-element:nth-child(5) {
    top: 50%;
    left: 50%;
    animation-delay: 3s;
    animation-duration: 5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); opacity: 0.5; }
    25% { transform: translateY(-30px) rotate(90deg); opacity: 1; }
    50% { transform: translateY(-60px) rotate(180deg); opacity: 0.8; }
    75% { transform: translateY(-30px) rotate(270deg); opacity: 1; }
}

/* 开场内容 */
.splash-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: white;
    max-width: 900px;
    padding: 60px 40px;
    animation: fadeInUp 2s ease-out;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
}

@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(50px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Logo容器 */
.logo-container {
    margin-bottom: 60px;
    animation: rotateIn 2s ease-out;
    position: relative;
}

/* Logo装饰圆环 */
.logo-container::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 180px;
    height: 180px;
    border: 2px solid rgba(74, 144, 226, 0.2);
    border-radius: 50%;
    animation: logoRing 8s linear infinite;
}

.logo-container::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    border: 1px solid rgba(80, 200, 120, 0.15);
    border-radius: 50%;
    animation: logoRing 12s linear infinite reverse;
}

@keyframes logoRing {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes rotateIn {
    0% {
        opacity: 0;
        transform: rotate(-180deg) scale(0.5);
    }
    100% {
        opacity: 1;
        transform: rotate(0deg) scale(1);
    }
}

.logo-circle {
    width: 140px;
    height: 140px;
    margin: 0 auto 50px auto;
    background: linear-gradient(135deg, #4a90e2, #50c878);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 40px rgba(74, 144, 226, 0.6), 0 0 80px rgba(80, 200, 120, 0.3);
    animation: pulse 3s ease-in-out infinite;
    position: relative;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 30px rgba(74, 144, 226, 0.5); }
    50% { transform: scale(1.05); box-shadow: 0 0 50px rgba(80, 200, 120, 0.7); }
}

.logo-inner {
    width: 110px;
    height: 110px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(15px);
    border: 3px solid rgba(255, 255, 255, 0.3);
    box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.1);
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: white;
    text-shadow: 0 2px 15px rgba(0, 0, 0, 0.5);
    letter-spacing: 2px;
}

/* 标题样式 */
.splash-title {
    margin-bottom: 50px;
    animation: slideInLeft 2s ease-out 0.5s both;
    text-align: center;
}

@keyframes slideInLeft {
    0% {
        opacity: 0;
        transform: translateX(-100px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.title-main {
    font-size: 52px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff, #4a90e2, #50c878);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 4px 25px rgba(74, 144, 226, 0.4);
    animation: titleGlow 4s ease-in-out infinite;
    letter-spacing: 3px;
    line-height: 1.2;
}

@keyframes titleGlow {
    0%, 100% { text-shadow: 0 4px 20px rgba(74, 144, 226, 0.3); }
    50% { text-shadow: 0 4px 30px rgba(80, 200, 120, 0.5); }
}

.title-sub {
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 30px;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 0 2px 15px rgba(0, 0, 0, 0.6);
    letter-spacing: 2px;
    position: relative;
}

.title-sub::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 2px;
    background: linear-gradient(90deg, transparent, #4a90e2, #50c878, transparent);
    border-radius: 1px;
}

.title-org {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 300;
    letter-spacing: 2px;
}

/* 描述文字 */
.splash-description {
    margin-bottom: 60px;
    animation: slideInRight 2s ease-out 1s both;
    max-width: 600px;
}

@keyframes slideInRight {
    0% {
        opacity: 0;
        transform: translateX(100px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

.splash-description p {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 15px;
    line-height: 1.8;
    letter-spacing: 1px;
    font-weight: 300;
}

/* 进入按钮 */
.enter-button-container {
    margin-bottom: 50px;
    animation: bounceIn 2s ease-out 1.5s both;
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% { transform: scale(0.9); }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

.enter-button {
    position: relative;
    background: linear-gradient(135deg, #4a90e2, #50c878);
    border: none;
    padding: 18px 50px;
    border-radius: 60px;
    color: white;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.4s ease;
    box-shadow: 0 10px 30px rgba(74, 144, 226, 0.4), 0 5px 15px rgba(80, 200, 120, 0.2);
    min-width: 220px;
    letter-spacing: 1px;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.enter-button:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 15px 40px rgba(74, 144, 226, 0.5), 0 8px 20px rgba(80, 200, 120, 0.3);
    background: linear-gradient(135deg, #5ba0f2, #60d888);
    border-color: rgba(255, 255, 255, 0.4);
}

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

.button-text {
    position: relative;
    z-index: 2;
}

.button-ripple {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.enter-button:active .button-ripple {
    width: 300px;
    height: 300px;
}

/* 加载指示器 */
.loading-indicator {
    animation: fadeIn 2s ease-out 2s both;
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.loading-dots {
    display: flex;
    justify-content: center;
    margin-bottom: 15px;
}

.loading-dots span {
    width: 12px;
    height: 12px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    margin: 0 5px;
    animation: loadingDots 1.5s ease-in-out infinite;
}

.loading-dots span:nth-child(1) { animation-delay: 0s; }
.loading-dots span:nth-child(2) { animation-delay: 0.3s; }
.loading-dots span:nth-child(3) { animation-delay: 0.6s; }

@keyframes loadingDots {
    0%, 80%, 100% {
        opacity: 0.3;
        transform: scale(0.8);
    }
    40% {
        opacity: 1;
        transform: scale(1.2);
    }
}

.loading-text {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: 1.5px;
    font-weight: 300;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .splash-content {
        padding: 40px 20px;
        max-width: 95%;
        min-height: 85vh;
    }
    
    .logo-container {
        margin-bottom: 40px;
    }
    
    .logo-container::before {
        width: 140px;
        height: 140px;
    }
    
    .logo-container::after {
        width: 160px;
        height: 160px;
    }
    
    .logo-circle {
        width: 110px;
        height: 110px;
        margin-bottom: 30px;
    }
    
    .logo-inner {
        width: 85px;
        height: 85px;
    }
    
    .logo-text {
        font-size: 18px;
    }
    
    .splash-title {
        margin-bottom: 40px;
    }
    
    .title-main {
        font-size: 38px;
        letter-spacing: 2px;
    }
    
    .title-sub {
        font-size: 28px;
        margin-bottom: 25px;
    }
    
    .title-sub::after {
        width: 80px;
    }
    
    .splash-description {
        margin-bottom: 50px;
        max-width: 100%;
    }
    
    .splash-description p {
        font-size: 18px;
    }
    
    .enter-button-container {
        margin-bottom: 40px;
    }
    
    .enter-button {
        padding: 15px 40px;
        font-size: 18px;
        min-width: 180px;
    }
}

@media (max-width: 480px) {
    .splash-content {
        padding: 30px 15px;
    }
    
    .title-main {
        font-size: 32px;
        letter-spacing: 1px;
    }
    
    .title-sub {
        font-size: 24px;
    }
    
    .logo-circle {
        width: 90px;
        height: 90px;
    }
    
    .logo-inner {
        width: 70px;
        height: 70px;
    }
    
    .logo-text {
        font-size: 16px;
    }
    
    .splash-description p {
        font-size: 16px;
    }
    
    .enter-button {
        padding: 12px 35px;
        font-size: 16px;
        min-width: 160px;
    }
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(135deg, #1a2332 0%, #2d3e50 50%, #34495e 100%);
    min-height: 100vh;
    color: #fff;
    overflow: hidden;
    transition: all 0.3s ease;
}

/* 网络状态指示器 */
.network-status {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: white;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.network-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
}

.signal-bars {
    display: flex;
    align-items: flex-end;
    gap: 2px;
    height: 16px;
}

.signal-bars .bar {
    width: 3px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 1px;
    transition: all 0.3s ease;
}

.signal-bars .bar:nth-child(1) { height: 4px; }
.signal-bars .bar:nth-child(2) { height: 8px; }
.signal-bars .bar:nth-child(3) { height: 12px; }
.signal-bars .bar:nth-child(4) { height: 16px; }

.signal-bars .bar.active {
    background: #4CAF50;
    box-shadow: 0 0 4px rgba(76, 175, 80, 0.5);
}

/* 网络状态颜色 */
.network-status.poor .signal-bars .bar.active {
    background: #f44336;
    box-shadow: 0 0 4px rgba(244, 67, 54, 0.5);
}

.network-status.fair .signal-bars .bar.active {
    background: #ff9800;
    box-shadow: 0 0 4px rgba(255, 152, 0, 0.5);
}

.network-status.good .signal-bars .bar.active {
    background: #4CAF50;
    box-shadow: 0 0 4px rgba(76, 175, 80, 0.5);
}

.network-status.excellent .signal-bars .bar.active {
    background: #2196F3;
    box-shadow: 0 0 4px rgba(33, 150, 243, 0.5);
}

.network-text {
    font-weight: 500;
    white-space: nowrap;
}

/* 页面头部 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to bottom, rgba(26, 35, 50, 0.95), rgba(26, 35, 50, 0.7));
    backdrop-filter: blur(15px);
    border-bottom: 2px solid rgba(52, 152, 219, 0.3);
    padding: 20px 40px;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.fullscreen {
    transform: translateY(-100%);
    opacity: 0;
}

.main-title {
    color: #ffffff;
    font-size: 36px;
    font-weight: 900;
    text-align: center;
    letter-spacing: 4px;
    text-shadow: 
        0 0 20px rgba(52, 152, 219, 0.8),
        0 0 40px rgba(52, 152, 219, 0.6),
        0 4px 8px rgba(0, 0, 0, 0.5);
    margin-bottom: 12px;
    background: linear-gradient(135deg, #3498db, #2ecc71, #f1c40f);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleGlow 2s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    0% {
        text-shadow: 
            0 0 20px rgba(52, 152, 219, 0.8),
            0 0 40px rgba(52, 152, 219, 0.6),
            0 4px 8px rgba(0, 0, 0, 0.5);
    }
    100% {
        text-shadow: 
            0 0 30px rgba(52, 152, 219, 1),
            0 0 60px rgba(52, 152, 219, 0.8),
            0 4px 8px rgba(0, 0, 0, 0.5);
    }
}

.subtitle {
    color: #ffffff;
    font-size: 20px;
    text-align: center;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 20px;
    text-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.5),
        0 0 15px rgba(52, 152, 219, 0.5);
    background: linear-gradient(135deg, #ecf0f1, #bdc3c7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.controls-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.fullscreen-btn {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
}

.fullscreen-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.topics-btn {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.2);
}

.topics-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.4);
}

.page-jump {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #ecf0f1;
    font-size: 14px;
}

#page-input {
    width: 60px;
    padding: 8px;
    border: 2px solid rgba(52, 152, 219, 0.3);
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    color: #ecf0f1;
    text-align: center;
    font-size: 14px;
}

#page-input:focus {
    outline: none;
    border-color: #3498db;
    background: rgba(255, 255, 255, 0.15);
}

#jump-btn {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

#jump-btn:hover {
    background: linear-gradient(135deg, #27ae60, #2ecc71);
    transform: translateY(-1px);
}

/* 两侧主题导航 */
.side-topics {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 280px;
    z-index: 100;
    transition: all 0.3s ease;
}

.left-topics {
    left: 20px;
}

.right-topics {
    right: 20px;
}

.side-topics.fullscreen {
    opacity: 0;
    visibility: hidden;
}

.side-topic-item {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.15), rgba(46, 204, 113, 0.15));
    border: 2px solid rgba(52, 152, 219, 0.3);
    border-radius: 12px;
    padding: 15px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.side-topic-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, #3498db, #2ecc71);
    transition: all 0.3s ease;
}

.side-topic-item:hover {
    transform: translateX(5px);
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.25), rgba(46, 204, 113, 0.25));
    border-color: #3498db;
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.3);
}

.right-topics .side-topic-item:hover {
    transform: translateX(-5px);
}

.side-topic-item:hover::before {
    width: 100%;
    opacity: 0.1;
}

.topic-num {
    color: #3498db;
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(52, 152, 219, 0.3);
}

.topic-text {
    color: #ecf0f1;
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* 主容器 */
.container {
    width: 100%;
    height: calc(100vh - 160px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 340px;
    margin-top: 120px;
    transition: all 0.3s ease;
    position: relative;
}

.container.fullscreen {
    padding: 0;
    margin-top: 0;
    height: 100vh;
}

.book-wrapper {
    position: relative;
    perspective: 1500px;
    width: 100%;
    max-width: 900px;
    height: 100%;
    margin: 0 auto;
    transition: all 0.3s ease;
}

.book-wrapper.fullscreen {
    width: 100%;
    height: 100vh;
    max-width: none;
}

.book {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    background: #f8f9fa;
    border-radius: 12px;
    box-shadow: 
        0 25px 50px rgba(0, 0, 0, 0.4),
        0 0 0 1px rgba(52, 152, 219, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    border: 3px solid rgba(52, 152, 219, 0.2);
}

.book.fullscreen {
    border-radius: 0;
    border: none;
}

.book::before {
    content: '';
    position: absolute;
    left: -15px;
    top: 0;
    width: 15px;
    height: 100%;
    background: linear-gradient(to right, #2c3e50, #34495e, #3498db);
    border-radius: 6px 0 0 6px;
    box-shadow: 3px 0 15px rgba(0, 0, 0, 0.3);
}

.book.fullscreen::before {
    display: none;
}

.page-container {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    border-radius: 12px;
    background: #ffffff;
}

.page-container.fullscreen {
    border-radius: 0;
}

.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    backface-visibility: hidden;
    transform-style: preserve-3d;
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
}

.page.fullscreen {
    border-radius: 0;
}

.page canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
    max-width: 100%;
    max-height: 100%;
}

.page.fullscreen canvas {
    border-radius: 0;
}

/* PDF容器样式 */
.pdf-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #ffffff;
    border-radius: 12px;
    overflow: hidden;
}

.pdf-container.fullscreen {
    border-radius: 0;
}

/* 加载动画样式 */
.loading {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    font-size: 18px;
    color: #7f8c8d;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    background: #ffffff;
    z-index: 5;
}

.loading .loading-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    animation: spin 2s linear infinite;
    margin-bottom: 20px;
}

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

.page.turning-next {
    animation: flipNext 1.5s ease-in-out forwards;
    z-index: 10;
}

.page.turning-prev {
    animation: flipPrev 1.5s ease-in-out forwards;
    z-index: 10;
}

@keyframes flipNext {
    0% {
        transform: rotateY(0deg);
        transform-origin: right center;
        box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
    }
    15% {
        transform: rotateY(-15deg);
        box-shadow: -8px 0 35px rgba(0, 0, 0, 0.2);
    }
    50% {
        transform: rotateY(-90deg);
        box-shadow: -25px 0 50px rgba(0, 0, 0, 0.4);
    }
    85% {
        transform: rotateY(-165deg);
        box-shadow: -8px 0 35px rgba(0, 0, 0, 0.2);
    }
    100% {
        transform: rotateY(-180deg);
        box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
    }
}

@keyframes flipPrev {
    0% {
        transform: rotateY(-180deg);
        transform-origin: left center;
        box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
    }
    15% {
        transform: rotateY(-165deg);
        box-shadow: 8px 0 35px rgba(0, 0, 0, 0.2);
    }
    50% {
        transform: rotateY(-90deg);
        box-shadow: 25px 0 50px rgba(0, 0, 0, 0.4);
    }
    85% {
        transform: rotateY(-15deg);
        box-shadow: 8px 0 35px rgba(0, 0, 0, 0.2);
    }
    100% {
        transform: rotateY(0deg);
        box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
    }
}

/* 底部控制面板 */
.controls {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 30px;
    padding: 18px 35px;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.95), rgba(52, 73, 94, 0.95));
    border-radius: 50px;
    backdrop-filter: blur(15px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(52, 152, 219, 0.2);
    transition: all 0.3s ease;
    max-width: 90vw;
    overflow: hidden;
}

/* 页面滚动条 */
.page-slider {
    position: fixed;
    bottom: 120px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    max-width: 600px;
    background: rgba(44, 62, 80, 0.9);
    border-radius: 15px;
    padding: 15px 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(52, 152, 219, 0.2);
    display: none;
}

.page-slider.active {
    display: block;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    color: #ecf0f1;
    font-size: 14px;
}

.slider-range {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.2);
    outline: none;
    margin-bottom: 10px;
    -webkit-appearance: none;
}

.slider-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3498db, #2ecc71);
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(52, 152, 219, 0.5);
}

.slider-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3498db, #2ecc71);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 10px rgba(52, 152, 219, 0.5);
}

.slider-info {
    display: flex;
    justify-content: space-between;
    color: #bdc3c7;
    font-size: 12px;
}

.close-slider {
    background: none;
    border: none;
    color: #ecf0f1;
    font-size: 18px;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}

.close-slider:hover {
    background: rgba(255, 255, 255, 0.1);
}

.controls.fullscreen {
    transform: translateX(-50%) translateY(100%);
    opacity: 0;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.action-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.jump-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-btn {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
}

.nav-btn:disabled {
    background: linear-gradient(135deg, #7f8c8d, #95a5a6);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.page-info {
    color: #ecf0f1;
    font-size: 18px;
    font-weight: 600;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.action-btn {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.2);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(231, 76, 60, 0.4);
}

.jump-controls #page-input {
    width: 70px;
    padding: 8px 12px;
    border: 2px solid rgba(52, 152, 219, 0.3);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.1);
    color: #ecf0f1;
    text-align: center;
    font-size: 14px;
    font-weight: 600;
}

.jump-controls #page-input:focus {
    outline: none;
    border-color: #3498db;
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 10px rgba(52, 152, 219, 0.3);
}

.control-btn {
    padding: 12px 24px;
    border: none;
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(52, 152, 219, 0.4);
    background: linear-gradient(135deg, #2980b9, #3498db);
}

.control-btn:disabled {
    background: linear-gradient(135deg, #7f8c8d, #95a5a6);
    cursor: not-allowed;
    transform: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#page-info {
    font-size: 18px;
    color: #ecf0f1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 0 20px;
}

/* 加载动画 */
.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    border: 4px solid rgba(52, 152, 219, 0.3);
    border-top: 4px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* 页面指示器 */
.page-indicator {
    position: fixed;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(44, 62, 80, 0.9);
    padding: 15px;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    color: #ecf0f1;
    font-weight: 500;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(52, 152, 219, 0.2);
    transition: all 0.3s ease;
}

.page-indicator.fullscreen {
    transform: translateY(-50%) translateX(-100%);
    opacity: 0;
}

/* 主题导航面板 */
.topics-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.topics-panel.active {
    opacity: 1;
    visibility: visible;
}

.topics-panel > div {
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.95), rgba(44, 62, 80, 0.95));
    border-radius: 20px;
    padding: 30px;
    max-width: 90%;
    max-height: 90%;
    overflow-y: auto;
    border: 2px solid rgba(52, 152, 219, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.topics-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid rgba(52, 152, 219, 0.3);
}

.topics-header h3 {
    color: #3498db;
    font-size: 24px;
    font-weight: 700;
    margin: 0;
    letter-spacing: 1px;
}

.close-btn {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 24px;
    font-weight: 700;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.4);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 15px;
    max-height: 70vh;
    padding: 10px;
}

@media (max-width: 1400px) {
    .topics-grid {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: repeat(4, 1fr);
    }
}

@media (max-width: 900px) {
    .topics-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(5, 1fr);
        max-height: 80vh;
        overflow-y: auto;
    }
}

.topic-card {
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1), rgba(46, 204, 113, 0.1));
    border: 2px solid rgba(52, 152, 219, 0.3);
    border-radius: 12px;
    padding: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, #3498db, #2ecc71);
    transition: width 0.3s ease;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(52, 152, 219, 0.3);
    border-color: #3498db;
}

.topic-card:hover::before {
    width: 100%;
    opacity: 0.1;
}

.topic-number {
    color: #3498db;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
}

.topic-title {
    color: #ecf0f1;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.topic-page {
    color: #95a5a6;
    font-size: 14px;
    font-weight: 500;
}

/* 滚动条样式 */
.topics-grid::-webkit-scrollbar {
    width: 8px;
}

.topics-grid::-webkit-scrollbar-track {
    background: rgba(52, 152, 219, 0.1);
    border-radius: 4px;
}

.topics-grid::-webkit-scrollbar-thumb {
    background: rgba(52, 152, 219, 0.5);
    border-radius: 4px;
}

.topics-grid::-webkit-scrollbar-thumb:hover {
    background: rgba(52, 152, 219, 0.7);
}

/* 移动端适配优化 */
@media (max-width: 768px) {
    .header {
        padding: 10px 15px;
        height: 60px;
    }
    
    .main-title {
        font-size: 18px;
        letter-spacing: 1px;
        margin: 0;
    }
    
    .subtitle {
        display: none; /* 手机端隐藏副标题 */
    }
    
    /* 手机端隐藏侧边导航 */
    .side-topics {
        display: none !important;
    }
    
    /* 手机端容器优化 */
    .container {
        padding: 10px;
        margin-top: 70px;
        height: calc(100vh - 140px);
    }
    
    .book-wrapper {
        width: 100%;
        max-width: none;
        height: 100%;
    }
    
    .book {
        border-radius: 8px;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    }
    
    .page-container, .page, .page canvas, .pdf-container {
        border-radius: 8px;
    }
    
    /* 手机端控制面板优化 */
    .controls {
        bottom: 10px;
        padding: 8px 12px;
        gap: 10px;
        border-radius: 20px;
        max-width: calc(100vw - 20px);
        flex-wrap: nowrap;
        overflow-x: auto;
    }
    
    .nav-controls {
        gap: 8px;
        flex-shrink: 0;
    }
    
    .action-controls {
        gap: 6px;
        flex-shrink: 0;
    }
    
    .nav-btn {
        padding: 6px 10px;
        font-size: 11px;
        min-width: 50px;
        white-space: nowrap;
    }
    
    .action-btn {
        padding: 6px 8px;
        font-size: 10px;
        min-width: 40px;
        white-space: nowrap;
    }
    
    .page-info {
        font-size: 12px;
        margin: 0 5px;
        flex-shrink: 0;
    }
    
    .jump-controls {
        display: flex;
        align-items: center;
        gap: 4px;
    }
    
    .jump-controls #page-input {
        width: 35px;
        padding: 4px;
        font-size: 11px;
    }
    
    /* 手机端滚动条优化 */
    .page-slider {
        bottom: 70px;
        width: calc(100vw - 20px);
        padding: 8px 12px;
        max-width: none;
    }
    
    .slider-header {
        font-size: 11px;
        margin-bottom: 8px;
    }
    
    .slider-range {
        height: 8px;
    }
    
    .slider-range::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }
    
    /* 手机端主题面板优化 */
    .topics-panel {
        width: 100%;
        height: 100%;
        padding: 0;
    }
    
    .topics-panel > div {
        width: 100%;
        height: 100%;
        border-radius: 0;
        padding: 15px;
        max-width: none;
        max-height: none;
    }
    
    .topics-header {
        padding-bottom: 12px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        margin-bottom: 15px;
    }
    
    .topics-header h3 {
        font-size: 18px;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
        gap: 10px;
        max-height: calc(100vh - 100px);
        padding-right: 8px;
    }
    
    .topic-card {
        padding: 12px;
        margin-bottom: 0;
    }
    
    .topic-number {
        font-size: 16px;
    }
    
    .topic-title {
        font-size: 13px;
        line-height: 1.4;
    }
    
    .topic-page {
        font-size: 11px;
    }
    
    /* 网络状态移动端优化 */
    .network-status {
        top: 10px;
        right: 10px;
        padding: 4px 8px;
        font-size: 10px;
        border-radius: 12px;
    }
    
    .signal-bars {
        margin-right: 4px;
        transform: scale(0.8);
    }
    
    .signal-bars .bar:nth-child(1) { height: 3px; }
    .signal-bars .bar:nth-child(2) { height: 6px; }
    .signal-bars .bar:nth-child(3) { height: 9px; }
    .signal-bars .bar:nth-child(4) { height: 12px; }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 20px;
        letter-spacing: 1px;
    }
    
    .subtitle {
        font-size: 14px;
    }
    
    .page-jump {
        flex-direction: column;
        gap: 8px;
        align-items: center;
    }
    
    #page-input {
        width: 80px;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(10, 1fr);
    }
    
    .topic-card {
        min-height: 80px;
        padding: 12px;
    }
}

/* 装饰元素 */
.decoration-top {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #3498db, #2ecc71, #f1c40f, #e74c3c);
    z-index: 1001;
}

.decoration-bottom {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #e74c3c, #f1c40f, #2ecc71, #3498db);
    z-index: 1001;
}

/* 全屏时隐藏顶部标题和两侧主题按钮 */
body.fullscreen .header,
body.fullscreen .side-topics {
    display: none !important;
}

body.fullscreen .container {
    margin-top: 0 !important;
    padding: 0 !important;
    height: 100vh !important;
    width: 100vw !important;
    max-width: none !important;
    justify-content: center !important;
    align-items: center !important;
}

body.fullscreen .book-wrapper {
    max-width: none !important;
    width: 100vw !important;
    height: 100vh !important;
    margin: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
}

/* 全屏时的控制栏样式 */
body.fullscreen .controls {
    left: 50% !important;
    bottom: 20px !important;
    transform: translateX(-50%) !important;
    max-width: 95vw !important;
    border-radius: 30px !important;
    transition: all 0.3s ease !important;
}

/* 全屏时控制栏可收起状态 */
body.fullscreen .controls.hidden {
    transform: translateX(-50%) translateY(100%) !important;
    opacity: 0 !important;
    pointer-events: none !important;
}

/* 全屏时的控制栏显示/隐藏切换按钮 */
.fullscreen-toggle-btn {
    position: fixed;
    bottom: 10px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(44, 62, 80, 0.9), rgba(52, 73, 94, 0.9));
    border: 2px solid rgba(52, 152, 219, 0.3);
    color: #ecf0f1;
    font-size: 20px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    z-index: 1000;
}

.fullscreen-toggle-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 25px rgba(52, 152, 219, 0.4);
    border-color: rgba(52, 152, 219, 0.6);
}

.fullscreen-toggle-btn:active {
    transform: scale(0.95);
}

/* 全屏时显示切换按钮 */
body.fullscreen .fullscreen-toggle-btn {
    display: flex !important;
    opacity: 0.6;
}

body.fullscreen .fullscreen-toggle-btn:hover {
    opacity: 1 !important;
}

/* 控制栏自动隐藏功能 */
body.fullscreen .controls.auto-hide {
    transition: all 0.5s ease !important;
}

body.fullscreen .controls.auto-hide:not(:hover) {
    transform: translateX(-50%) translateY(80%) !important;
    opacity: 0.3 !important;
}

body.fullscreen .controls.auto-hide:hover {
    transform: translateX(-50%) translateY(0%) !important;
    opacity: 1 !important;
}

/* 全屏使用提示 */
.fullscreen-hint {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(44, 62, 80, 0.9);
    color: #ecf0f1;
    padding: 10px 20px;
    border-radius: 20px;
    font-size: 14px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(52, 152, 219, 0.3);
    display: none;
    z-index: 1001;
    animation: fadeInOut 4s ease-in-out;
}

body.fullscreen .fullscreen-hint {
    display: block;
}

@keyframes fadeInOut {
    0% { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    20% { opacity: 1; transform: translateX(-50%) translateY(0px); }
    80% { opacity: 1; transform: translateX(-50%) translateY(0px); }
    100% { opacity: 0; transform: translateX(-50%) translateY(-20px); }
}