/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4361ee;
    --secondary-color: #3a0ca3;
    --accent-color: #4cc9f0;
    --success-color: #4ade80;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    
    --basic-color: #3b82f6;
    --advanced-color: #8b5cf6;
    --premium-color: #f59e0b;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', sans-serif;
    color: var(--dark-color);
    line-height: 1.6;
    background-color: #f9fafb;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    line-height: 1.3;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
}

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

section {
    padding: 80px 0;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 1.8rem;
}

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

.nav-links a {
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
}

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

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

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

.cta-button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 12px 24px;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

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

/* 英雄部分 */
.hero {
    padding-top: 150px;
    background: linear-gradient(135deg, #f0f4ff 0%, #e6f0ff 100%);
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--gray-color);
    margin-bottom: 20px;
    font-weight: 400;
}

.description {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #555;
}

.hero-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 15px 30px;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.hero-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    gap: 15px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating-element {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    animation: float 6s ease-in-out infinite;
    box-shadow: var(--shadow-xl);
}

.floating-element i {
    font-size: 8rem;
    color: white;
}

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

/* 套餐部分 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.section-header p {
    font-size: 1.2rem;
    color: var(--gray-color);
    max-width: 600px;
    margin: 0 auto;
}

.plans-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.plan-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--light-gray);
}

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

.plan-card.basic {
    border-top: 5px solid var(--basic-color);
}

.plan-card.advanced {
    border-top: 5px solid var(--advanced-color);
}

.plan-card.premium {
    border-top: 5px solid var(--premium-color);
}

.plan-card.featured {
    transform: scale(1.05);
    z-index: 1;
}

.plan-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.plan-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 25px;
    text-align: center;
}

.plan-icon {
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 15px;
    font-size: 1.8rem;
    color: white;
}

.basic .plan-icon {
    background: linear-gradient(135deg, var(--basic-color), #60a5fa);
}

.advanced .plan-icon {
    background: linear-gradient(135deg, var(--advanced-color), #a78bfa);
}

.premium .plan-icon {
    background: linear-gradient(135deg, var(--premium-color), #fbbf24);
}

.plan-header h3 {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.plan-badge {
    position: absolute;
    top: 20px;
    right: -30px;
    background-color: var(--success-color);
    color: white;
    padding: 5px 40px;
    font-size: 0.9rem;
    font-weight: 600;
    transform: rotate(45deg);
}

.basic .plan-badge {
    background-color: var(--basic-color);
}

.advanced .plan-badge {
    background-color: var(--advanced-color);
}

.premium .plan-badge {
    background-color: var(--premium-color);
}

.plan-price {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--light-gray);
}

.currency {
    font-size: 1.5rem;
    font-weight: 600;
    vertical-align: top;
    color: var(--gray-color);
}

.amount {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
    margin: 0 5px;
}

.basic .amount {
    color: var(--basic-color);
}

.advanced .amount {
    color: var(--advanced-color);
}

.premium .amount {
    color: var(--premium-color);
}

.period {
    font-size: 1.2rem;
    color: var(--gray-color);
    font-weight: 500;
}

.plan-features {
    margin-bottom: 30px;
}

.feature {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.feature i {
    color: var(--success-color);
    font-size: 1.2rem;
}

.feature span {
    font-size: 1rem;
}

.plan-button {
    width: 100%;
    padding: 15px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    margin-bottom: 20px;
}

.basic .plan-button {
    background-color: var(--basic-color);
    color: white;
}

.advanced .plan-button {
    background-color: var(--advanced-color);
    color: white;
}

.premium .plan-button {
    background-color: var(--premium-color);
    color: white;
}

.plan-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.featured-button {
    background: linear-gradient(135deg, var(--advanced-color), #7c3aed) !important;
}

.plan-note {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--gray-color);
    padding-top: 15px;
    border-top: 1px solid var(--light-gray);
}

.plan-note i {
    color: var(--accent-color);
}

/* 套餐对比表格 */
.plan-comparison {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-md);
}

.plan-comparison h3 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.8rem;
    color: var(--dark-color);
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead {
    background-color: var(--light-color);
}

th, td {
    padding: 15px;
    text-align: center;
    border-bottom: 1px solid var(--light-gray);
}

th {
    font-weight: 600;
    color: var(--dark-color);
}

tbody tr:hover {
    background-color: #f8f9fa;
}

/* 特点部分 */
.features-section {
    background-color: #f0f4ff;
}

.features-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0 auto 20px;
    font-size: 2rem;
    color: white;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.feature-card p {
    color: var(--gray-color);
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: white;
    padding-top: 60px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3, .footer-section h4 {
    margin-bottom: 20px;
    color: white;
}

.footer-section h3 i {
    margin-right: 10px;
    color: var(--accent-color);
}

.footer-section p {
    color: #cbd5e1;
    margin-bottom: 20px;
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 1.2rem;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: #cbd5e1;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.contact-info li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: #cbd5e1;
}

.contact-info i {
    color: var(--accent-color);
    width: 20px;
}

.subscribe-form {
    display: flex;
    margin-top: 15px;
}

.subscribe-form input {
    flex: 1;
    padding: 12px 15px;
    border: none;
    border-radius: 50px 0 0 50px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    outline: none;
}

.subscribe-form input::placeholder {
    color: #94a3b8;
}

.subscribe-form button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 12px 20px;
    border-radius: 0 50px 50px 0;
    transition: var(--transition);
}

.subscribe-form button:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #94a3b8;
    font-size: 0.9rem;
}

.footer-bottom p {
    margin-bottom: 5px;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}