:root {
    --primary-color: #7B68EE;
    --background-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-color: #1d1d1f;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --gradient-start: #7B68EE;
    --gradient-end: #9370DB;
    --transition: all 0.3s ease;
}

.dark-mode {
    --background-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #ffffff;
    --border-color: #404040;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: var(--transition);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo svg {
    fill: var(--primary-color);
}

h1 {
    font-size: 1.8rem;
    font-weight: 600;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text; /* 兼容 Safari */
    background-clip: text; /* 标准属性 */
    -webkit-text-fill-color: transparent; /* 兼容 Safari */
    color: transparent; /* 标准属性 */
}

.theme-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.8rem;
    border-radius: 50%;
    background-color: var(--card-bg);
    box-shadow: 0 2px 8px var(--shadow-color);
}

.theme-btn svg {
    fill: var(--text-color);
}

.section-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text; /* 兼容 Safari */
    background-clip: text; /* 标准属性 */
    -webkit-text-fill-color: transparent; /* 兼容 Safari */
    color: transparent; /* 标准属性 */
}

.section-desc {
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 2rem;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.service-card {
    background-color: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px var(--shadow-color);
}

.service-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon svg {
    fill: white;
}

.service-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.service-card p {
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 1.5rem;
}

.service-footer {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.price {
    font-weight: 600;
    color: var(--primary-color);
}

.limit {
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.6;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

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

    .section-title {
        font-size: 1.8rem;
    }
}