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

/* Variables */
:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --white: #ffffff;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-600: #475569;
    --gray-900: #0f172a;
    --border-radius: 12px;
    --box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--white);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--gray-600);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
    text-align: center;
}

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

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

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

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

/* Header */
.header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    user-select: none;
    transition: var(--transition);
}

.logo:hover {
    color: var(--primary-hover);
    transform: scale(1.05);
}

.logo:focus {
    outline: none;
}

.logo i {
    font-size: 2rem;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    transition: var(--transition);
}

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

.mobile-menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: var(--white);
    padding: 6rem 0;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h1 {
    margin-bottom: 1.5rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
}

.hero-image {
    text-align: center;
}

.hero-image i {
    font-size: 12rem;
    opacity: 0.8;
}

/* Services Section */
.services {
    padding: 6rem 0;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    align-items: start;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
}

/* 确保大屏幕上每行最多3个卡片 */
@media (min-width: 1200px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 2rem;
    }
}

/* 中等屏幕每行2个卡片 */
@media (min-width: 768px) and (max-width: 1199px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

.service-card {
    background-color: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 380px;
    margin: 0 auto;
    min-height: 500px;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border-color: var(--primary-color);
}

.service-card.premium {
    border: 3px solid var(--accent-color);
    box-shadow: 0 15px 35px rgba(245, 158, 11, 0.15);
}

.service-card.hot {
    border: 3px solid var(--danger-color);
    box-shadow: 0 15px 35px rgba(239, 68, 68, 0.15);
}

/* 根据评分等级的边框颜色和样式 */
/* 高评分卡片 (4.8分及以上) - 3px绿色边框 */
.service-card.high-rating {
    border-color: var(--success-color);
    border-width: 3px;
    border-style: solid;
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.15), 0 0 0 1px rgba(16, 185, 129, 0.1);
}

/* 中等评分卡片 (4.5-4.7分) - 2.5px蓝色边框 */
.service-card.medium-rating {
    border-color: var(--primary-color);
    border-width: 2.5px;
    border-style: solid;
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.12), 0 0 0 1px rgba(59, 130, 246, 0.08);
}

/* 基础评分卡片 (4.4分及以下) - 2px灰色边框 */
.service-card.basic-rating {
    border-color: var(--gray-400);
    border-width: 2px;
    border-style: solid;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

/* 悬停时的边框变化 */
.service-card.high-rating:hover {
    border-color: #059669; /* 更深的绿色 */
    border-width: 3px; /* 保持 3px 边框 */
    box-shadow: 0 25px 45px rgba(16, 185, 129, 0.25), 0 0 0 2px rgba(16, 185, 129, 0.15);
    transform: translateY(-8px) scale(1.02);
}

.service-card.medium-rating:hover {
    border-color: var(--primary-hover);
    border-width: 2.5px; /* 保持 2.5px 边框 */
    box-shadow: 0 22px 40px rgba(59, 130, 246, 0.2), 0 0 0 2px rgba(59, 130, 246, 0.1);
    transform: translateY(-6px) scale(1.015);
}

.service-card.basic-rating:hover {
    border-color: var(--gray-600);
    border-width: 2px; /* 保持 2px 边框 */
    box-shadow: 0 18px 35px rgba(0, 0, 0, 0.15);
    transform: translateY(-4px) scale(1.01);
}

.service-header {
    padding: 1.5rem 1.5rem 1rem;
    text-align: center;
    position: relative;
}

.service-badge {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--accent-color);
    color: var(--white);
    padding: 0.4rem 0.8rem;
    border-radius: 0 0 0 var(--border-radius);
    font-weight: 600;
    font-size: 0.8rem;
    transition: var(--transition);
}

/* 不同类型徽章的颜色样式 */
/* 推荐徽章 - 金色渐变 */
.service-badge.badge-recommend {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.service-badge.badge-recommend:hover {
    background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    transform: scale(1.05);
}

/* 低价徽章 - 绿色渐变 */
.service-badge.badge-lowprice {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.service-badge.badge-lowprice:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    transform: scale(1.05);
}

/* 精品徽章 - 紫色渐变 */
.service-badge.badge-premium {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.service-badge.badge-premium:hover {
    background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 100%);
    transform: scale(1.05);
}

/* 热门徽章 - 红色渐变 */
.service-badge.badge-hot {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.service-badge.badge-hot:hover {
    background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    transform: scale(1.05);
}

.rating {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    margin-top: 0.5rem;
}

.rating i {
    color: var(--accent-color);
    font-size: 0.9rem;
}

.rating span {
    margin-left: 0.5rem;
    color: var(--gray-600);
    font-size: 0.85rem;
}

.service-features {
    padding: 0 1.5rem 0.5rem;
}

.feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
}

.feature i {
    color: var(--success-color);
    font-size: 0.8rem;
    min-width: 12px;
}

.service-pricing {
    padding: 0.5rem 1.5rem 1rem;
    background-color: var(--gray-100);
}

.price-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--gray-200);
    font-size: 0.9rem;
}

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

.price-item.recommended {
    font-weight: 600;
    margin: 0;
    padding: 0.5rem 0;
}

.price-item .duration {
    font-weight: 500;
}

.price-item .price {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1rem;
}

.price-item.recommended .price {
    color: var(--accent-color);
    font-weight: 700;
    font-size: 1.1rem;
}

.discount {
    background-color: var(--success-color);
    color: var(--white);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
}

.service-promo {
    padding: 1rem 1.5rem;
    background-color: var(--light-color);
    border-top: 1px solid var(--gray-200);
}

.promo-code {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.promo-code code {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', 'Consolas', 'Courier New', monospace;
    font-weight: 600;
    flex: 1;
    font-size: 0.85rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.promo-code code:hover {
    background-color: #374151;
    transform: scale(1.05);
}

.promo-benefit {
    color: var(--success-color);
    font-weight: 600;
    font-size: 0.85rem;
}

.service-actions {
    padding: 1.5rem;
    display: flex;
    gap: 0.5rem;
    text-align: center;
    margin-top: auto;
}

.service-actions .btn {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
}

/* Tutorial Section */
.tutorial {
    padding: 6rem 0;
}

.tutorial-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step-content h3 {
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: var(--white);
    padding: 2rem 0;
}

.footer-bottom {
    text-align: center;
    color: var(--gray-300);
}

/* Responsive Design */
/* 小屏幕单列布局 */
@media (max-width: 767px) {
    .container {
        padding: 0 15px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--white);
        box-shadow: var(--box-shadow);
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image i {
        font-size: 6rem;
    }

    .services-grid {
        grid-template-columns: 1fr !important;
        gap: 1.5rem;
        max-width: 500px;
        margin: 0 auto;
    }

    .tutorial-steps {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .services-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 0 10px;
    }

    .service-card {
        margin: 0;
        max-width: 100%;
    }

    .service-header {
        padding: 1rem 1rem 0.5rem;
    }

    .service-features {
        padding: 0 1rem 0.5rem;
    }

    .service-pricing {
        padding: 0.5rem 1rem;
    }

    .service-promo {
        padding: 0.75rem 1rem;
    }

    .service-actions {
        padding: 1rem;
        flex-direction: column;
        gap: 0.5rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .services,
    .tutorial {
        padding: 3rem 0;
    }
}

/* Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.service-card,
.step {
    animation: fadeInUp 0.6s ease forwards;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}