* {
    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, #1a1a2e 0%, #2d1f3d 50%, #1a1a2e 100%);
    overflow-x: hidden;
}

.bg-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.plane {
    position: absolute;
    font-size: 48px;
    animation: fly 8s ease-in-out infinite;
}

.p1 { top: 15%; left: -5%; animation-delay: 0s; }
.p2 { top: 35%; right: -5%; animation-delay: 3s; font-size: 36px; opacity: 0.6; }

@keyframes fly {
    0% { transform: translateX(0) translateY(0) rotate(-10deg); }
    25% { transform: translateX(30vw) translateY(-20px) rotate(0deg); }
    50% { transform: translateX(60vw) translateY(10px) rotate(10deg); }
    75% { transform: translateX(90vw) translateY(-15px) rotate(0deg); }
    100% { transform: translateX(110vw) translateY(0) rotate(-10deg); }
}

.connection {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(230, 126, 34, 0.3), transparent);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(26, 26, 46, 0.8);
    border-bottom: 1px solid rgba(230, 126, 34, 0.2);
}

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

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

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

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

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 20px;
    transition: all 0.3s;
    font-size: 15px;
}

.nav-link:hover {
    background: rgba(230, 126, 34, 0.2);
    color: #e67e22;
}

.nav-link.active {
    background: linear-gradient(135deg, #e67e22, #f39c12);
    color: #fff;
}

.hero-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 60px;
    position: relative;
    z-index: 1;
}

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

.plane-visual {
    position: relative;
    width: 200px;
    height: 100px;
    margin: 0 auto 40px;
}

.plane-icon {
    font-size: 80px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(-5deg); }
    50% { transform: translateY(-15px) rotate(5deg); }
}

.trail {
    position: absolute;
    top: 50%;
    left: 0;
    width: 150px;
    height: 4px;
    background: linear-gradient(90deg, transparent, rgba(230, 126, 34, 0.5));
    border-radius: 2px;
    transform: translateY(-50%);
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #e67e22, #f39c12);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.7);
    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, #e67e22, #f39c12);
    color: #fff;
    box-shadow: 0 4px 20px rgba(230, 126, 34, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(230, 126, 34, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

.stats-row {
    display: flex;
    gap: 40px;
    margin-top: 60px;
    flex-wrap: wrap;
    justify-content: center;
}

.stat-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(230, 126, 34, 0.2);
    border-radius: 20px;
    padding: 30px 40px;
    text-align: center;
    transition: all 0.3s;
}

.stat-card:hover {
    background: rgba(230, 126, 34, 0.1);
    transform: translateY(-5px);
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: #e67e22;
}

.stat-label {
    display: block;
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    margin-top: 8px;
}

.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;
}

.section-desc {
    color: rgba(255, 255, 255, 0.6);
    font-size: 18px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(230, 126, 34, 0.2);
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s;
}

.feature-card:hover {
    background: rgba(230, 126, 34, 0.1);
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

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

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

.feature-card p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
}

.download-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 60px;
    position: relative;
    z-index: 1;
}

.download-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(230, 126, 34, 0.2);
    border-radius: 30px;
    padding: 50px;
    max-width: 450px;
    width: 100%;
    text-align: center;
    backdrop-filter: blur(20px);
}

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

.app-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #e67e22, #f39c12);
    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(230, 126, 34, 0.4);
}

.flight-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid rgba(230, 126, 34, 0.3);
    border-radius: 50%;
    animation: ringPulse 2s ease-in-out infinite;
}

.ring-1 { width: 130px; height: 130px; }
.ring-2 { width: 160px; height: 160px; animation-delay: 0.5s; }

@keyframes ringPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    50% { transform: translate(-50%, -50%) scale(1.1); opacity: 0.5; }
}

.card-title {
    font-size: 36px;
    margin-bottom: 10px;
    color: #e67e22;
}

.card-desc {
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 20px;
}

.version-tag {
    display: inline-block;
    background: linear-gradient(135deg, #e67e22, #f39c12);
    color: #fff;
    padding: 6px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 25px;
}

.info-grid {
    background: rgba(230, 126, 34, 0.05);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 30px;
    text-align: left;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.info-label {
    color: rgba(255, 255, 255, 0.5);
}

.info-value {
    color: #e67e22;
    font-weight: 500;
}

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

.back-link {
    display: inline-block;
    margin-top: 25px;
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.3s;
}

.back-link:hover {
    color: #e67e22;
}

.error-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 60px;
    position: relative;
    z-index: 1;
}

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

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

.lost-plane {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 80px;
    opacity: 0.4;
    animation: lost 2s ease-in-out infinite;
}

@keyframes lost {
    0%, 100% { transform: translate(-50%, -50%) rotate(-10deg); }
    50% { transform: translate(-50%, -50%) rotate(10deg); }
}

.error-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid rgba(230, 126, 34, 0.2);
    border-radius: 50%;
    animation: ringPulse 2s ease-in-out infinite;
}

.error-ring.ring-1 { width: 140px; height: 140px; }
.error-ring.ring-2 { width: 200px; height: 200px; animation-delay: 0.5s; }

.error-code {
    font-size: 120px;
    font-weight: 900;
    color: rgba(230, 126, 34, 0.2);
    line-height: 1;
    margin-bottom: 20px;
}

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

.error-message {
    color: rgba(255, 255, 255, 0.6);
    font-size: 18px;
    margin-bottom: 40px;
}

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

.footer {
    text-align: center;
    padding: 30px;
    color: rgba(255, 255, 255, 0.4);
    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-row {
        flex-direction: column;
        gap: 20px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .navbar {
        padding: 15px 20px;
    }
    
    .download-card {
        padding: 30px 20px;
    }
    
    .error-actions {
        flex-direction: column;
    }
}