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

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
    min-height: 100vh;
    color: #333;
    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%);
}

.hex-pattern {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='28' height='49' viewBox='0 0 28 49'%3E%3Cg fill-rule='evenodd'%3E%3Cg fill='%230078D4' fill-opacity='0.03'%3E%3Cpath d='M13.99 9.25l13 7.5v15l-13 7.5L1 31.75v-15l12.99-7.5zM3 17.9v12.7l10.99 6.34 11-6.35V17.9l-11-6.34L3 17.9zM0 15l12.98-7.5V0h-2v6.35L0 12.69v2.3zm0 18.5L12.98 41v8h-2v-6.85L0 35.81v-2.3zM15 0v7.5L27.99 15H28v-2.31h-.01L17 6.35V0h-2zm0 49v-8l12.99-7.5H28v2.31h-.01L17 42.15V49h-2z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.shield-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 120, 212, 0.1), transparent 60%);
    border-radius: 50%;
}

.header {
    position: fixed;
    top: 50px;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 15px 40px;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid #e0e0e0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    font-size: 32px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: #0078D4;
}

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

.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;
    padding: 150px 40px 60px;
    position: relative;
    z-index: 1;
}

.hero-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    text-align: left;
}

.tagline {
    display: inline-block;
    background: rgba(0, 120, 212, 0.1);
    border: 1px solid rgba(0, 120, 212, 0.3);
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    margin-bottom: 25px;
    color: #0078D4;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #333, #0078D4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 35px;
}

.hero-desc .highlight {
    color: #0078D4;
    font-weight: 600;
}

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

.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);
}

.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-container {
    position: relative;
    width: 280px;
    height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-main {
    font-size: 120px;
    z-index: 1;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.shield-ring {
    position: absolute;
    border: 2px solid rgba(0, 120, 212, 0.3);
    border-radius: 50%;
    animation: pulse-ring 3s ease-in-out infinite;
}

.ring-1 {
    width: 200px;
    height: 200px;
}

.ring-2 {
    width: 240px;
    height: 240px;
    animation-delay: 0.5s;
}

.ring-3 {
    width: 280px;
    height: 280px;
    animation-delay: 1s;
}

@keyframes pulse-ring {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.6; }
}

.stats-row {
    max-width: 1200px;
    margin: 60px auto 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.stat-card {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s;
}

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

.stat-card.zero .stat-number {
    color: #22c55e;
}

.stat-number {
    display: block;
    font-size: 42px;
    font-weight: 800;
    color: #0078D4;
}

.stat-label {
    display: block;
    color: #666;
    font-size: 14px;
    margin-top: 8px;
}

.compare-section,
.features-section {
    padding: 80px 40px;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
    color: #333;
}

.section-desc {
    color: #666;
}

.compare-grid {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.compare-card {
    background: #fff;
    border-radius: 20px;
    padding: 30px;
    border: 1px solid #e0e0e0;
}

.compare-card.good {
    border-color: #22c55e;
}

.compare-card.bad {
    border-color: #ef4444;
    opacity: 0.8;
}

.compare-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.compare-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
}

.compare-card.good .compare-icon {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.compare-card.bad .compare-icon {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

.compare-header h3 {
    font-size: 18px;
    color: #333;
}

.compare-list {
    list-style: none;
}

.compare-list li {
    padding: 10px 0;
    color: #666;
    border-bottom: 1px solid #e0e0e0;
    font-size: 15px;
}

.compare-list li:last-child {
    border-bottom: none;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 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;
}

.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%;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.card-visual {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto 30px;
}

.app-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #0078D4, #005a9e);
    border-radius: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 50px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    box-shadow: 0 15px 40px rgba(0, 120, 212, 0.3);
}

.card-visual .shield-ring {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.card-info h1 {
    font-size: 32px;
    margin-bottom: 8px;
    color: #333;
}

.tagline {
    color: #666;
}

.version-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin: 20px 0;
}

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

.badge-text {
    color: #999;
    font-size: 14px;
}

.specs-table {
    background: #f5f7fa;
    border-radius: 16px;
    padding: 20px;
    margin: 25px 0;
    text-align: left;
}

.spec-row {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid #e0e0e0;
}

.spec-row:last-child {
    border-bottom: none;
}

.spec-label {
    color: #999;
}

.spec-value {
    color: #0078D4;
    font-weight: 500;
}

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

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

.promise-grid {
    display: flex;
    justify-content: space-around;
}

.promise-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #666;
}

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

.back-link {
    display: inline-block;
    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-visual {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto 40px;
}

.broken-shield {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 80px;
    opacity: 0.5;
}

.error-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid rgba(0, 120, 212, 0.2);
    border-radius: 50%;
    animation: pulse-ring 2s ease-in-out infinite;
}

.error-ring.ring-1 {
    width: 150px;
    height: 150px;
}

.error-ring.ring-2 {
    width: 200px;
    height: 200px;
    animation-delay: 0.5s;
}

.error-code {
    font-size: 120px;
    font-weight: 900;
    color: rgba(0, 120, 212, 0.1);
    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;
}

.footer a {
    color: #0078D4;
    text-decoration: none;
    transition: color 0.3s;
}

.footer a:hover {
    color: #005a9e;
}

@media (max-width: 768px) {
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-actions {
        justify-content: center;
        flex-direction: column;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .shield-container {
        width: 200px;
        height: 200px;
    }
    
    .shield-main {
        font-size: 80px;
    }
    
    .stats-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .compare-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        padding: 15px 20px;
    }
    
    .nav {
        display: none;
    }
    
    .download-card {
        padding: 30px 20px;
    }
    
    .error-actions {
        flex-direction: column;
    }
}