/* Spotify会员服务平台 - 专业版UI */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1DB954;
    --primary-dark: #1AA34A;
    --primary-light: #1ED760;
    --secondary-color: #191414;
    --text-dark: #161616;
    --text-muted: #6b7280;
    --text-light: #ffffff;
    --bg-dark: #0b0b0b;
    --bg-secondary: #191414;
    --bg-light: #f3f4f6;
    --bg-white: #ffffff;
    --border-light: #e5e7eb;
    --gradient: linear-gradient(135deg, #1DB954 0%, #1ED760 100%);
    --gradient-dark: linear-gradient(135deg, #000000 0%, #191414 100%);
    --gradient-soft: linear-gradient(145deg, #ffffff 0%, #f9fafb 100%);
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.18);
    --shadow-green: 0 12px 30px rgba(29, 185, 84, 0.25);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-dark);
    background: var(--bg-white);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.2;
}

h2 {
    font-size: 2.6rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    padding-bottom: 0.75rem;
}

h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 88px;
    height: 4px;
    background: var(--gradient);
    border-radius: 999px;
}

/* 头部导航 */
header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(25, 20, 20, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.logo img {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

.logo h1 {
    font-size: 1.3rem;
    color: var(--primary-color);
    letter-spacing: 0.3px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 600;
    position: relative;
    padding-bottom: 0.3rem;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

/* 主横幅 */
.hero {
    background: var(--gradient-dark);
    color: var(--text-light);
    padding: 7rem 0 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: -50%;
    background:
        radial-gradient(circle at 25% 35%, rgba(29, 185, 84, 0.2) 0%, transparent 40%),
        radial-gradient(circle at 75% 60%, rgba(30, 215, 96, 0.15) 0%, transparent 45%);
    animation: heroGlow 14s ease-in-out infinite;
}

@keyframes heroGlow {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-20px, 10px); }
}

.hero-title {
    font-size: 3.4rem;
    font-weight: 800;
    margin-bottom: 1.2rem;
    text-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    position: relative;
    z-index: 1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #d1d5db;
    max-width: 920px;
    margin: 0 auto 1.6rem;
    position: relative;
    z-index: 1;
}

.hero-date {
    display: inline-block;
    padding: 0.7rem 1.8rem;
    border-radius: 999px;
    border: 1px solid rgba(29, 185, 84, 0.35);
    color: var(--primary-light);
    background: rgba(29, 185, 84, 0.12);
    box-shadow: var(--shadow-green);
    font-weight: 600;
    position: relative;
    z-index: 1;
}

.hero-cta {
    margin-top: 2.2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.9rem 2.2rem;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient);
    color: var(--text-light);
    box-shadow: var(--shadow-green);
    letter-spacing: 0.4px;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: var(--text-light);
    border: 2px solid rgba(255, 255, 255, 0.35);
}

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 关于服务 */
.about {
    padding: 5rem 0;
    background: var(--bg-light);
}

.about-content {
    display: grid;
    gap: 2.5rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
}

.stat-item {
    background: var(--gradient-soft);
    padding: 2.2rem 1.8rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    text-align: center;
    border: 1px solid rgba(29, 185, 84, 0.12);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.stat-item h3 {
    font-size: 2.6rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-item p {
    color: var(--text-muted);
    font-weight: 600;
}

.about-description {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
}

.about-description h3 {
    font-size: 1.6rem;
    margin-bottom: 1rem;
}

.about-description ul {
    list-style: none;
}

.about-description li {
    padding: 0.7rem 0;
    color: var(--text-dark);
}

/* 套餐权益 */
.benefits {
    padding: 5rem 0;
}

.benefit-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.benefit-card {
    background: var(--bg-white);
    padding: 2.6rem 2.2rem;
    border-radius: 22px;
    box-shadow: var(--shadow-md);
    text-align: center;
    border: 1px solid rgba(29, 185, 84, 0.12);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.benefit-icon {
    font-size: 3.8rem;
    margin-bottom: 1rem;
}

.benefit-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.8rem;
}

.benefit-card p {
    color: var(--text-muted);
}

/* 产品服务 */
.products {
    padding: 5rem 0;
    background: var(--bg-light);
}

.product-category {
    margin-bottom: 4rem;
}

.product-category > h3 {
    font-size: 1.9rem;
    margin-bottom: 2rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.6rem;
}

.product-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 18px;
    border: 1px solid rgba(29, 185, 84, 0.12);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-card h4 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
}

.product-desc {
    color: var(--text-muted);
    margin-bottom: 1rem;
    flex: 1;
}

.product-benefits {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.badge {
    padding: 0.35rem 0.8rem;
    border-radius: 999px;
    background: #eefbf2;
    color: #137a3b;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge.discount {
    background: var(--gradient);
    color: white;
}

.btn-buy {
    display: inline-block;
    width: 100%;
    padding: 0.85rem 1.2rem;
    border-radius: 999px;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    font-weight: 700;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-buy:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-green);
}

/* FAQ */
.faq {
    padding: 5rem 0;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.4rem;
}

.faq-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.6rem;
}

.faq-item p {
    color: var(--text-muted);
}

/* 购买入口 */
.subscribe {
    padding: 5rem 0;
    background: var(--bg-light);
}

.subscribe-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.subscribe-card {
    background: var(--bg-white);
    padding: 2.8rem 2.2rem;
    border-radius: 22px;
    border: 1px solid rgba(29, 185, 84, 0.15);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.subscribe-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.subscribe-card h3 {
    font-size: 2rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.4rem;
}

.subscribe-card > p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.subscribe-card ul {
    list-style: none;
    text-align: left;
    margin: 1.8rem 0;
}

.subscribe-card li {
    padding: 0.45rem 0;
    color: var(--text-dark);
}

.subscribe-card .btn {
    width: 100%;
    margin-top: 1rem;
}

.subscribe-cta {
    margin-top: 3rem;
    text-align: center;
    padding: 2rem;
    border-radius: 18px;
    background: rgba(29, 185, 84, 0.08);
    border: 1px solid rgba(29, 185, 84, 0.2);
    box-shadow: var(--shadow-sm);
}

.highlight {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.6rem;
}

/* 页脚 */
footer {
    background: var(--bg-secondary);
    color: #9ca3af;
    text-align: center;
    padding: 2.5rem 0;
}

footer p {
    margin: 0.4rem 0;
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 999px;
    background: var(--gradient);
    color: white;
    text-decoration: none;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-green);
    transition: transform 0.3s ease;
    z-index: 999;
}

.back-to-top:hover {
    transform: translateY(-4px);
}

/* 响应式 */
@media (max-width: 960px) {
    .hero-title { font-size: 2.6rem; }
    .nav-links { display: none; }
    .about-stats { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    h2 { font-size: 2rem; }
    .hero { padding: 5rem 0; }
    .hero-subtitle { font-size: 1.05rem; }
    .btn, .btn-buy { width: 100%; max-width: 320px; }
    .hero-cta { flex-direction: column; align-items: center; }
}