/* style/buy.css */
:root {
    --primary-color: #004882;
    --secondary-color: #E21C21;
    --text-color: #333;
    --bg-color: #f9f9f9;
    --accent-color: #ffcc00; /* 亮黄色，用于强调 */
}

body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav li {
    margin: 0 1rem;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

nav a:hover {
    background-color: var(--secondary-color);
}

nav a.active {
    background-color: var(--secondary-color);
    font-weight: bold;
}

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

.hero {
    text-align: center;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.online-channels, .offline-channels, .promo {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.online-channels h2, .offline-channels h2, .promo h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.channel-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.channel-item {
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
}

.channel-item img {
    max-width: 100%;
    height: auto;
    margin-bottom: 0.5rem;
}

.channel-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.channel-item a {
    text-decoration: none;
    color: inherit;
}

.discount {
    color: var(--secondary-color);
    font-weight: bold;
    display: block;
    margin-top: 0.5rem;
}

.promo p {
    margin-bottom: 1rem;
}

.button {
    display: inline-block;
    background-color: var(--secondary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.button:hover {
    background-color: darken(var(--secondary-color), 10%);
}

footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1rem 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    nav li {
        margin: 0.5rem 0;
    }
    main {
        padding: 1rem;
    }
    .channel-list {
        grid-template-columns: 1fr;
    }
}