/* CSS Reset and Variables */
:root {
    --primary-color: #0047FF;
    --primary-hover: #0036CC;
    --secondary-color: #F8FAFC;
    --text-main: #1E293B;
    --text-light: #64748B;
    --bg-white: #FFFFFF;
    --bg-light: #F1F5F9;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-white);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 80px 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-main);
}

/* Typography */
h1, h2, h3 {
    line-height: 1.2;
}
a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.btn-full {
    width: 100%;
    display: block;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}
.btn-outline:hover {
    background: var(--primary-color);
    color: #fff;
}

.btn-glow {
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 0 20px rgba(0, 71, 255, 0.4);
}
.btn-glow:hover {
    box-shadow: 0 0 30px rgba(0, 71, 255, 0.6);
}

/* Header */
.header {
    position: sticky;
    top: 20px;
    z-index: 1000;
    max-width: 1000px;
    width: 92%;
    margin: 20px auto;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 50px; /* 椭圆效果 */
    padding: 10px 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

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

.nav-menu a {
    font-weight: 500;
}
.nav-menu a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
    overflow: hidden;
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    color: var(--text-main);
}

.hero-content .subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 30px;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* Dynamic element */
.dynamic-globe {
    position: relative;
    width: 300px;
    height: 300px;
}

.hero-image {
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 2;
    animation: float 6s ease-in-out infinite;
}

.pulse-ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(0, 71, 255, 0.1);
    z-index: 1;
    animation: pulse 2s infinite ease-out;
}
.delay-1 {
    animation-delay: 1s;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

@keyframes pulse {
    0% { transform: translate(-50%, -50%) scale(0.8); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(1.5); opacity: 0; }
}


/* Grids */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

/* Feature Cards */
.feature-card {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--border-color);
}
.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}
.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 20px;
}
.feature-card h3 {
    margin-bottom: 15px;
    font-size: 1.25rem;
}
.feature-card p {
    color: var(--text-light);
}

/* Streaming & AI Card */
.card-horizontal {
    display: flex;
    background: var(--bg-white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    align-items: center;
}
.card-content {
    flex: 1;
    padding: 50px;
}
.card-content h2 {
    margin-bottom: 20px;
}
.card-content p {
    color: var(--text-light);
    margin-bottom: 30px;
}
.card-image {
    flex: 1;
    background: #e2e8f0;
}
.responsive-img {
    width: 100%;
    height: auto;
    display: block;
}

/* Pricing */
.price-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 40px;
    border: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    transition: transform 0.3s;
}
.price-card:hover {
    transform: translateY(-10px);
}
.price-card.popular {
    border: 2px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}
.price-card.popular:hover {
    transform: scale(1.05) translateY(-10px);
}
.badge {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--primary-color);
    color: #fff;
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: bold;
}
.price-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}
.price-card .price {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 30px;
}
.price-card .price span {
    font-size: 1rem;
    color: var(--text-light);
}
.price-features {
    list-style: none;
    margin-bottom: 30px;
    text-align: left;
}
.price-features li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
}
.price-features li:last-child {
    border-bottom: none;
}

/* SEO Articles */
.article-card {
    display: block;
    background: var(--bg-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}
.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}
.article-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background: #e2e8f0;
}
.article-info {
    padding: 20px;
}
.article-info h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-main);
}
.article-info p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.4;
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}
.faq-item {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 20px;
}
.faq-item h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
}
.faq-item p {
    color: var(--text-light);
}

/* Reviews */
.review-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}
.stars {
    color: #F59E0B;
    font-size: 1.2rem;
    margin-bottom: 15px;
}
.review-card p {
    font-style: italic;
    color: var(--text-main);
    margin-bottom: 20px;
}
.review-card .user {
    color: var(--text-light);
    font-weight: bold;
}

/* Footer */
.footer {
    background: #0F172A;
    color: #CBD5E1;
    padding: 60px 0 30px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid #334155;
    padding-bottom: 40px;
}
.footer-brand h2 {
    color: #FFF;
    margin-bottom: 15px;
}
.footer-links-group h3 {
    color: #FFF;
    margin-bottom: 20px;
    font-size: 1.1rem;
}
.footer-links-group a {
    display: block;
    color: #CBD5E1;
    margin-bottom: 10px;
}
.footer-links-group a:hover {
    color: #FFF;
}
.footer-bottom {
    text-align: center;
    font-size: 0.9rem;
}
.friend-links {
    margin-top: 15px;
}
.friend-links a {
    margin: 0 10px;
}
.friend-links a:hover {
    text-decoration: underline;
}

/* Mobile Responsiveness */
@media (max-width: 992px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    .hero-content h1 {
        font-size: 2.8rem;
    }
    .card-horizontal {
        flex-direction: column;
    }
    .price-card.popular {
        transform: scale(1);
    }
    .price-card.popular:hover {
        transform: translateY(-5px);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none; /* simple hidden on mobile for extreme minimal */
    }
    .grid-3 {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .section-title {
        font-size: 2rem;
    }
    .hero-content h1 {
        font-size: 2.2rem;
    }
}