/* ==================== CSS变量系统 ==================== */
:root {
    /* 颜色 */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-secondary: #3b82f6;
    --color-accent: #8b5cf6;
    --color-success: #10b981;
    --color-warning: #f59e0b;

    /* 背景色 */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;

    /* 文字颜色 */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #3b82f6 100%);
    --gradient-secondary: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    --gradient-accent: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%);

    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* 圆角 */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.3);

    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ==================== 玻璃态效果 ==================== */
.glass-card {
    background: rgba(30, 41, 59, 0.6);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(99, 102, 241, 0.3);
}

/* ==================== Hero区域 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: var(--spacing-2xl) 0;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0.1;
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.2) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(99, 102, 241, 0.2);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 2rem;
    font-size: 0.9rem;
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==================== 按钮样式 ==================== */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

.primary-cta {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.primary-cta:hover {
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.6);
}

.secondary-cta {
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.secondary-cta:hover {
    background: rgba(99, 102, 241, 0.2);
    transform: translateY(-2px);
}

/* ==================== 通用区域样式 ==================== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

/* ==================== 产品特性区 ==================== */
.features {
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    padding: var(--spacing-xl);
    text-align: center;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-description {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== 价格方案区 ==================== */
.pricing {
    background: var(--bg-secondary);
}

.pricing-single {
    max-width: 500px;
    margin: 0 auto var(--spacing-3xl);
}

.pricing-card-single {
    padding: var(--spacing-2xl);
    text-align: center;
    position: relative;
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
}

.pricing-card.featured {
    transform: scale(1.05);
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
}

.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-accent);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 2rem;
    font-size: 0.85rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.pricing-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.pricing-price {
    margin-bottom: var(--spacing-sm);
}

.price-currency {
    font-size: 1.5rem;
    color: var(--text-secondary);
    vertical-align: top;
}

.price-amount {
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-period {
    font-size: 1.2rem;
    color: var(--text-muted);
}

.pricing-save {
    color: var(--color-success);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.pricing-original {
    text-decoration: line-through;
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.pricing-features {
    list-style: none;
    margin: var(--spacing-lg) 0;
    text-align: left;
}

.pricing-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.pricing-card .cta-button,
.pricing-card-single .cta-button {
    width: 100%;
    justify-content: center;
    margin-top: var(--spacing-md);
}

/* 组团优惠区域 */
.group-discount {
    margin-top: var(--spacing-3xl);
    text-align: center;
}

.discount-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.discount-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto var(--spacing-lg);
}

.discount-item {
    padding: var(--spacing-xl);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

.discount-item.highlight {
    border-color: rgba(139, 92, 246, 0.5);
    box-shadow: 0 0 30px rgba(139, 92, 246, 0.3);
}

.discount-item:hover {
    transform: translateY(-8px) scale(1.02);
}

.discount-badge {
    position: absolute;
    top: -12px;
    right: var(--spacing-md);
    background: var(--gradient-accent);
    color: white;
    padding: 4px 12px;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.discount-number {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.discount-price {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.discount-price span {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.discount-save {
    color: var(--color-success);
    font-weight: 600;
    font-size: 0.9rem;
}

.discount-note {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: var(--spacing-lg) auto 0;
    padding: var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* ==================== 微信群二维码区 ==================== */
.qrcode-section {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    position: relative;
    overflow: hidden;
}

.qrcode-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}

.qrcode-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.glow-text {
    text-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

.qrcode-wrapper {
    display: flex;
    justify-content: center;
    margin: var(--spacing-2xl) 0;
}

.qrcode-container {
    position: relative;
    padding: var(--spacing-xl);
    display: inline-block;
}

.qrcode-image {
    width: 300px;
    height: 300px;
    border-radius: var(--radius-md);
    display: block;
}

.qrcode-pulse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
    height: 320px;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    animation: qrcodePulse 2s ease-out infinite;
}

@keyframes qrcodePulse {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }

    100% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0;
    }
}

.qrcode-benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-md);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.benefit-icon {
    font-size: 1.5rem;
}

.benefit-text {
    font-weight: 500;
    color: var(--text-primary);
}

/* ==================== FAQ区域 ==================== */
.faq {
    background: var(--bg-primary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-icon {
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 var(--spacing-lg);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--spacing-lg) var(--spacing-md);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--bg-secondary);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.footer-brand h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

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

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: var(--spacing-xs) 0;
}

.footer-disclaimer {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .hero {
        min-height: 80vh;
        padding: var(--spacing-xl) 0;
    }

    .hero-tags {
        flex-direction: column;
        align-items: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .pricing-grid,
    .discount-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured,
    .pricing-card-single {
        transform: scale(1);
    }

    .qrcode-image {
        width: 250px;
        height: 250px;
    }

    .qrcode-pulse {
        width: 270px;
        height: 270px;
    }

    .qrcode-benefits {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    section {
        padding: var(--spacing-2xl) 0;
    }

    .qrcode-image {
        width: 200px;
        height: 200px;
    }

    .qrcode-pulse {
        width: 220px;
        height: 220px;
    }
}

/* ==================== 滚动动画 ==================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}