/* ==========================================================================
   基础设置 & 变量 (Base & Variables)
   ========================================================================== */
   :root {
    /* 颜色系统 */
    --bg-color: #050505;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --accent-color: #3b82f6;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    
    /* 玻璃态效果 (Glassmorphism) - 更新为更透明 */
    --glass-bg: rgba(255, 255, 255, 0.015);
    --glass-border: rgba(255, 255, 255, 0.06);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4);
    
    /* 排版 */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* 间距与圆角 */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    /* 全新背景渐变，增加宇宙深邃感 */
    background-image: radial-gradient(circle at top right, #0d1b2a, #050505 50%, #000000 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* ==========================================================================
   背景动态效果 (Background Effects)
   ========================================================================== */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.3;
    animation: float 20s infinite alternate;
}

.orb-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: radial-gradient(circle, rgba(59,130,246,0.3) 0%, rgba(0,0,0,0) 70%);
}

.orb-2 {
    bottom: -20%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: radial-gradient(circle, rgba(139,92,246,0.2) 0%, rgba(0,0,0,0) 70%);
    animation-delay: -5s;
}

.orb-3 {
    top: 40%;
    left: 50%;
    width: 40vw;
    height: 40vw;
    background: radial-gradient(circle, rgba(236,72,153,0.1) 0%, rgba(0,0,0,0) 70%);
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(5%, 5%) scale(1.1); }
}

/* ==========================================================================
   通用组件 (Utility Components)
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.highlight {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 2rem; }
.w-80 { width: 80%; }
.w-60 { width: 60%; }
.w-40 { width: 40%; }

/* ==========================================================================
   按钮样式 (Buttons)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    gap: 8px;
    min-height: 48px; 
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
    transform: translateY(-2px);
}

.btn-outline {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

.cta-pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7); }
    70% { box-shadow: 0 0 0 15px rgba(59, 130, 246, 0); }
    100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

/* ==========================================================================
   导航栏 (Navbar)
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 16px 0;
    border-top: none;
    border-left: none;
    border-right: none;
    border-radius: 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-text {
    background: linear-gradient(to right, #fff, #a5b4fc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--accent-color);
}

/* ==========================================================================
   主视觉区 (Hero Section) & 飞机动画
   ========================================================================== */
.hero {
    padding-top: 140px;
    padding-bottom: 80px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    text-align: left;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    background: rgba(59, 130, 246, 0.1);
    color: #93c5fd;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.headline {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 0 40px 0;
}

.hero-stats {
    display: flex;
    justify-content: flex-start;
    gap: 48px;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--glass-border);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-num {
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* 品牌专属动态视觉 */
.hero-visual {
    position: relative;
    height: 100%;
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.airplane-container {
    position: relative;
    width: 300px;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: floatPlane 6s ease-in-out infinite;
}

.visual-glow-ring {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 2px dashed rgba(59, 130, 246, 0.3);
    animation: rotateRing 20s linear infinite;
    z-index: 1;
}

.airplane-shadow {
    position: absolute;
    width: 180px;
    height: 30px;
    background: rgba(59, 130, 246, 0.5);
    bottom: -60px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 50%;
    filter: blur(25px);
    animation: shadowPulse 6s ease-in-out infinite;
    z-index: 2;
}

.airplane-model {
    position: relative;
    z-index: 10;
    font-size: 8rem;
    /* CSS 投影光效 */
    filter: drop-shadow(0 0 40px rgba(59, 130, 246, 0.8));
    transform: rotate(15deg);
}

.plane-icon {
    display: inline-block;
    animation: shakePlane 0.5s ease-in-out infinite alternate;
}

.speed-lines {
    position: absolute;
    top: 50%;
    right: 120%;
    width: 250px;
    height: 120px;
    transform: translateY(-50%) rotate(-15deg);
}

.speed-lines .line {
    position: absolute;
    height: 3px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.9), transparent);
    animation: speedLine 1.5s linear infinite;
    border-radius: 50%;
}

.l-1 { top: 20%; width: 120px; animation-delay: 0s; }
.l-2 { top: 50%; width: 180px; animation-delay: 0.3s; }
.l-3 { top: 80%; width: 90px; animation-delay: 0.7s; }

@keyframes floatPlane {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-30px); }
}

@keyframes shakePlane {
    0% { transform: translateY(0) rotate(0deg); }
    100% { transform: translateY(-2px) rotate(1deg); }
}

@keyframes shadowPulse {
    0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.5; }
    50% { transform: translateX(-50%) scale(0.7); opacity: 0.2; }
}

@keyframes speedLine {
    0% { transform: translateX(50px); opacity: 0; }
    20% { opacity: 1; }
    80% { opacity: 1; }
    100% { transform: translateX(-250px); opacity: 0; }
}

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

/* ==========================================================================
   特性区块 (Features)
   ========================================================================== */
.features {
    padding: 80px 24px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 40px;
    border-radius: var(--radius-lg);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.hover-card:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.4);
    box-shadow: 0 12px 40px 0 rgba(59, 130, 246, 0.15);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 24px;
    display: inline-block;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--text-secondary);
}

/* ==========================================================================
   解锁流媒体 (Unlock)
   ========================================================================== */
.unlock {
    padding: 80px 24px;
}

.unlock-card {
    border-radius: var(--radius-lg);
    padding: 48px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.unlock-content h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
    line-height: 1.2;
}

.unlock-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.unlock-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 32px;
}

.tag {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
}

.mock-ui {
    background: rgba(0,0,0,0.4);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.mock-header {
    background: rgba(255,255,255,0.05);
    padding: 12px 16px;
    display: flex;
    gap: 8px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.mock-body {
    padding: 24px;
}

.line {
    height: 12px;
    background: rgba(255,255,255,0.1);
    border-radius: 6px;
    margin-bottom: 12px;
}

.box {
    height: 120px;
    background: linear-gradient(135deg, rgba(59,130,246,0.15), rgba(139,92,246,0.15));
    border-radius: var(--radius-sm);
}

/* ==========================================================================
   定价方案 (Pricing)
   ========================================================================== */
.pricing {
    padding: 80px 24px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    align-items: center;
}

.pricing-card {
    padding: 40px;
    border-radius: var(--radius-lg);
    position: relative;
}

.pricing-card.popular {
    border-color: rgba(59, 130, 246, 0.5);
    background: rgba(59, 130, 246, 0.05);
    transform: scale(1.05);
}

.popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-gradient);
    color: white;
    padding: 4px 16px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
}

.plan-name {
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.plan-price {
    margin-bottom: 24px;
}

.currency {
    font-size: 1.5rem;
    vertical-align: top;
}

.amount {
    font-size: 3rem;
    font-weight: 800;
}

.period {
    color: var(--text-secondary);
}

.plan-features {
    list-style: none;
    margin-bottom: 32px;
}

.plan-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.plan-features svg {
    width: 20px;
    height: 20px;
    color: #3b82f6;
}

/* ==========================================================================
   SEO 文章区 (SEO Articles)
   ========================================================================== */
.articles {
    padding: 80px 24px;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.article-card {
    padding: 32px;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    max-height: 450px;
    overflow-y: auto;
}

.article-card::-webkit-scrollbar {
    width: 6px;
}
.article-card::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
}

.article-card h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    line-height: 1.4;
    color: var(--text-primary);
}

.article-content {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.article-content h4 {
    color: var(--text-primary);
    margin: 16px 0 8px 0;
    font-size: 1.05rem;
}

.article-content p {
    margin-bottom: 12px;
}

.article-content a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

.article-content a:hover {
    text-decoration: underline;
}

.article-content strong {
    color: var(--text-primary);
}

/* ==========================================================================
   常见问题 (FAQ)
   ========================================================================== */
.faq {
    padding: 80px 24px;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    padding: 24px;
    border-radius: var(--radius-md);
}

.faq-question {
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.faq-answer {
    color: var(--text-secondary);
}

/* ==========================================================================
   用户评价 (Reviews)
   ========================================================================== */
.reviews {
    padding: 80px 24px;
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.review-card {
    padding: 32px;
    border-radius: var(--radius-lg);
}

.review-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.avatar {
    font-size: 2rem;
    background: rgba(255,255,255,0.05);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.user-info h4 {
    margin: 0;
    font-size: 1rem;
}

.user-title {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.review-text {
    color: var(--text-secondary);
    font-style: italic;
}

/* ==========================================================================
   底部 CTA (Bottom CTA)
   ========================================================================== */
.bottom-cta {
    padding: 80px 24px;
}

.cta-banner {
    padding: 60px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url('data:image/svg+xml;utf8,<svg width="100%" height="100%" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
}

.cta-banner h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.cta-banner p {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.footer {
    border-top: 1px solid var(--glass-border);
    padding: 60px 0 24px 0;
    background: rgba(0,0,0,0.3);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.footer-desc {
    color: var(--text-secondary);
    margin-top: 16px;
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    padding-top: 24px;
}

/* ==========================================================================
   响应式设计 (Media Queries)
   ========================================================================== */
@media (max-width: 992px) {
    .headline {
        font-size: 2.8rem;
    }
    
    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 60px;
    }
    
    .hero-actions {
        justify-content: center !important;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .unlock-card {
        grid-template-columns: 1fr;
    }
    
    .nav-links {
        display: none; /* 移动端隐藏菜单，保持极简 */
    }
}

@media (max-width: 768px) {
    .headline {
        font-size: 2.2rem;
    }
    
    .hero {
        padding-top: 120px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
}