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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    min-height: 100vh;
    color: #fff;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
    overflow-x: hidden;
}

.bing-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 50px;
    background: #fff;
    display: flex;
    align-items: center;
    padding: 0 20px;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    border-bottom: 1px solid #e0e0e0;
}

.bing-logo {
    display: flex;
    align-items: center;
}

.bing-logo svg {
    display: block;
}

.bg-effects {
    position: fixed;
    top: 50px;
    left: 0;
    width: 100%;
    height: calc(100% - 50px);
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8ec 100%);
}

.wave {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 200px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%230078D4' fill-opacity='0.05' d='M0,96L48,112C96,128,192,160,288,165.3C384,171,480,149,576,149.3C672,149,768,171,864,165.3C960,160,1056,128,1152,122.7C1248,117,1344,139,1392,149.3L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E") repeat-x;
    background-size: 50% 100%;
    animation: wave 20s linear infinite;
}

.wave-1 { opacity: 0.5; animation-duration: 25s; }
.wave-2 { opacity: 0.3; animation-duration: 20s; animation-delay: -5s; bottom: 20px; }
.wave-3 { opacity: 0.2; animation-duration: 15s; animation-delay: -10s; bottom: 40px; }

@keyframes wave {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.bubble {
    position: absolute;
    background: radial-gradient(circle at 30% 30%, rgba(0, 120, 212, 0.3), rgba(0, 120, 212, 0.1));
    border-radius: 50%;
    animation: rise 10s ease-in infinite;
}

.b1 { width: 60px; height: 60px; left: 10%; bottom: -60px; animation-duration: 12s; }
.b2 { width: 40px; height: 40px; left: 30%; bottom: -40px; animation-duration: 10s; animation-delay: 2s; }
.b3 { width: 80px; height: 80px; left: 60%; bottom: -80px; animation-duration: 15s; animation-delay: 4s; }
.b4 { width: 30px; height: 30px; left: 85%; bottom: -30px; animation-duration: 8s; animation-delay: 1s; }

@keyframes rise {
    0% { transform: translateY(0) scale(1); opacity: 0.8; }
    50% { opacity: 0.6; }
    100% { transform: translateY(-100vh) scale(0.5); opacity: 0; }
}

.navbar {
    position: fixed;
    top: 50px;
    left: 0;
    right: 0;
    padding: 15px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-icon {
    font-size: 28px;
}

.brand-text {
    font-size: 20px;
    font-weight: 600;
    color: #333;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: #666;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 20px;
    transition: all 0.3s;
    font-size: 15px;
}

.nav-link:hover {
    background: rgba(0, 120, 212, 0.1);
    color: #0078D4;
}

.nav-link.active {
    background: #0078D4;
    color: #fff;
}

.hero-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 150px 20px 60px;
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    max-width: 800px;
}

.logo-container {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto 40px;
}

.logo-outer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 180px;
    height: 180px;
    border: 2px solid rgba(0, 120, 212, 0.3);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.logo-inner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, #0078D4, #005a9e);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 60px rgba(0, 120, 212, 0.5);
}

.logo-icon {
    font-size: 60px;
    animation: waveAnim 3s ease-in-out infinite;
}

@keyframes waveAnim {
    0%, 100% { transform: rotate(-5deg); }
    50% { transform: rotate(5deg); }
}

.logo-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 220px;
    height: 220px;
    background: radial-gradient(circle, rgba(0, 120, 212, 0.3), transparent 70%);
    border-radius: 50%;
}

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

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #333, #0078D4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: #666;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #0078D4, #005a9e);
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 120, 212, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 120, 212, 0.6);
}

.btn-secondary {
    background: rgba(0, 120, 212, 0.1);
    color: #0078D4;
    border: 1px solid rgba(0, 120, 212, 0.3);
}

.btn-secondary:hover {
    background: rgba(0, 120, 212, 0.2);
    transform: translateY(-3px);
}

.stats-container {
    display: flex;
    gap: 30px;
    margin-top: 80px;
    flex-wrap: wrap;
    justify-content: center;
}

.stat-card {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 20px;
    padding: 25px 35px;
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.stat-card:hover {
    background: #fff;
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 120, 212, 0.15);
}

.stat-icon {
    font-size: 36px;
}

.stat-info {
    text-align: left;
}

.stat-number {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: #0078D4;
}

.stat-label {
    display: block;
    color: #666;
    font-size: 14px;
}

.features-section {
    padding: 100px 40px;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 15px;
    color: #333;
}

.section-desc {
    color: #666;
    font-size: 18px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 20px;
    padding: 35px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.feature-card:hover {
    background: #fff;
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 120, 212, 0.15);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.7;
}

.download-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 150px 20px 60px;
    position: relative;
    z-index: 1;
}

.download-card {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 30px;
    padding: 50px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.app-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #0078D4, #005a9e);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    box-shadow: 0 10px 30px rgba(0, 120, 212, 0.3);
}

.header-text h1 {
    font-size: 28px;
    margin-bottom: 5px;
    color: #333;
}

.header-text p {
    color: #666;
    font-size: 14px;
}

.version-badge {
    display: inline-block;
    background: linear-gradient(135deg, #0078D4, #005a9e);
    color: #fff;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 25px;
}

.download-info {
    background: #f5f7fa;
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 25px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px 0;
    border-bottom: 1px solid #e0e0e0;
}

.info-item:last-child {
    border-bottom: none;
}

.info-icon {
    font-size: 20px;
}

.info-content {
    flex: 1;
    display: flex;
    justify-content: space-between;
}

.info-label {
    color: #999;
}

.info-value {
    color: #333;
    font-weight: 500;
}

.download-features {
    background: #f5f7fa;
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 25px;
}

.download-features h3 {
    font-size: 16px;
    margin-bottom: 15px;
    color: #0078D4;
}

.download-features ul {
    list-style: none;
}

.download-features li {
    padding: 8px 0;
    color: #666;
    font-size: 14px;
}

.btn-download {
    width: 100%;
    justify-content: center;
    font-size: 18px;
    padding: 18px;
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 25px;
    color: #999;
    text-decoration: none;
    transition: color 0.3s;
}

.back-link:hover {
    color: #0078D4;
}

.error-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 150px 20px 60px;
    position: relative;
    z-index: 1;
}

.error-content {
    text-align: center;
}

.error-illustration {
    width: 200px;
    height: 150px;
    margin: 0 auto 40px;
    position: relative;
}

.broken-ship {
    position: relative;
    width: 100%;
    height: 100%;
}

.ship-body {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 40px;
    background: linear-gradient(135deg, #0078D4, #005a9e);
    border-radius: 50% 50% 0 0;
}

.ship-cabin {
    position: absolute;
    bottom: 65px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 30px;
    background: linear-gradient(135deg, #4fc3f7, #0078D4);
    border-radius: 5px;
}

.broken-part {
    position: absolute;
    top: 20px;
    right: 30px;
    width: 30px;
    height: 30px;
    background: rgba(0, 120, 212, 0.2);
    border-radius: 50%;
    transform: rotate(30deg);
}

.wave-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 30px;
    background: linear-gradient(90deg, transparent, rgba(0, 120, 212, 0.3), transparent);
    animation: waveAnim 2s ease-in-out infinite;
}

.error-code {
    font-size: 100px;
    font-weight: 900;
    color: rgba(0, 120, 212, 0.2);
    line-height: 1;
    margin-bottom: 20px;
}

.error-title {
    font-size: 36px;
    margin-bottom: 15px;
    color: #333;
}

.error-message {
    color: #666;
    font-size: 18px;
    margin-bottom: 40px;
}

.error-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.footer {
    text-align: center;
    padding: 30px;
    color: #999;
    font-size: 14px;
    position: relative;
    z-index: 1;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .stats-container {
        flex-direction: column;
        gap: 15px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .navbar {
        padding: 15px 20px;
    }
    
    .download-card {
        padding: 30px 20px;
    }
    
    .error-actions {
        flex-direction: column;
    }
}