/* 基础重置与变量 (暗黑科技紫风格) */
:root {
    --primary-color: #a855f7; 
    --primary-hover: #c084fc;
    --bg-main: #0f172a;
    --bg-light: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --bg-white: #1e293b; 
    --border-color: #334155;
    --shadow: 0 10px 40px rgba(0,0,0,0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    background-color: var(--bg-main);
}

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

/* 胶囊悬浮导航栏 */
header {
    background: rgba(30, 41, 59, 0.65);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: fixed;
    top: 25px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 1100px;
    z-index: 100;
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: 0.5px;
}
.logo::after { content: '.'; color: var(--primary-color); }

nav {
    display: flex;
    gap: 30px;
}

nav a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--text-main);
}

@media (max-width: 600px) {
    header { width: 95%; top: 15px; border-radius: 20px; }
    nav { display: none; }
}

/* Typography & General */
h1, h2, h3, h4 {
    margin-bottom: 1rem;
    color: var(--text-main);
}

h2 {
    text-align: center;
    font-size: 2.4rem;
    margin: 40px 0 30px;
}

p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: #fff;
    border: none;
    box-shadow: 0 4px 15px rgba(168, 85, 247, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(168, 85, 247, 0.6);
    color: #fff;
}

.btn-outline {
    background: rgba(168, 85, 247, 0.1);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

/* Hero */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: radial-gradient(circle at 85% 30%, rgba(168, 85, 247, 0.2) 0%, transparent 50%), var(--bg-main); 
    padding: 180px 20px 80px;
    border-radius: 0 0 40px 40px;
    gap: 3rem;
}

@media (min-width: 900px) {
    .hero {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
    .hero-content {
        flex: 1;
        padding-right: 2rem;
    }
    .hero-visual {
        flex: 1;
        display: flex;
        justify-content: center;
    }
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    font-weight: 800;
}

.hero-content p {
    font-size: 1.2rem;
    max-width: 600px;
    margin-bottom: 2rem;
}

/* Dynamic Visual Area in Hero */
.dynamic-container {
    position: relative;
    width: 320px;
    height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pulse-circle {
    width: 250px;
    height: 250px;
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(168, 85, 247, 0.05));
    border-radius: 50%;
    position: absolute;
    animation: pulse 4s ease-in-out infinite alternate;
    filter: blur(10px);
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.8; }
    100% { transform: scale(1.05); opacity: 1; }
}

.floating-card {
    position: absolute;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(10px);
    padding: 16px 24px;
    border-radius: 16px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.4);
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: float 6s ease-in-out infinite;
    border: 1px solid rgba(255,255,255,0.05);
}

.floating-card.c1 { top: 10%; left: -5%; animation-delay: 0s; }
.floating-card.c2 { bottom: 15%; right: -10%; animation-delay: -2s; }
.floating-card.c3 { top: 50%; left: 40%; transform: translate(-50%, -50%); animation-delay: -4s; z-index: 2; }

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

/* Cards Grid */
.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .cards {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

.card {
    background: var(--bg-light);
    padding: 40px 30px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.02);
    text-align: center;
    transition: transform 0.3s, background 0.3s;
    box-shadow: var(--shadow);
}

.card:hover {
    transform: translateY(-8px);
    background: #243147;
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: 20px;
    filter: drop-shadow(0 4px 10px rgba(168, 85, 247, 0.3));
}

/* Streaming & AI Cards */
.media-ai .cards {
    grid-template-columns: 1fr;
}
@media (min-width: 768px) {
    .media-ai .cards {
        grid-template-columns: 1fr 1fr;
    }
}

.media-card, .ai-card {
    padding: 3rem 2rem;
    background: var(--bg-light);
}

/* Pricing */
.price-card {
    display: flex;
    flex-direction: column;
}

.price {
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.price span {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.price-card ul {
    list-style: none;
    margin-bottom: 2rem;
    flex-grow: 1;
    text-align: left;
    padding-left: 1rem;
}

.price-card li {
    margin-bottom: 16px;
    color: var(--text-muted);
    position: relative;
    padding-left: 10px;
}
.price-card li::before {
    content: "✓";
    position: absolute;
    left: -1rem;
    color: var(--primary-color);
    font-weight: 800;
}

.price-card.popular {
    border: 2px solid var(--primary-color);
    position: relative;
    transform: scale(1.05);
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    box-shadow: 0 20px 50px rgba(168, 85, 247, 0.15);
}

@media (max-width: 768px) {
    .price-card.popular {
        transform: none;
    }
}

.price-card.popular::before {
    content: "最受欢迎";
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 6px 20px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(168, 85, 247, 0.4);
}

/* Reviews */
.review-card p {
    font-style: italic;
    margin-bottom: 1rem;
}
.review-card span {
    font-weight: bold;
    color: var(--primary-color);
}

/* Article Cards */
.article-card {
    text-decoration: none;
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    text-align: left;
    padding: 30px;
}
.article-card h3 {
    font-size: 1.25rem;
    color: var(--text-main);
    margin-bottom: 12px;
    line-height: 1.4;
}
.article-card p {
    color: var(--text-muted);
    line-height: 1.6;
}
.article-card:hover h3 {
    color: var(--primary-color);
}

/* FAQ */
.faq-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

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

.faq-item h4 {
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background: #0b1120;
    padding: 60px 0 40px;
    margin-top: 60px;
    border-top: 1px solid rgba(255,255,255,0.02);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.3s;
}

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

.copy {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}