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

body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: white;
}

nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

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

nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

nav a.active {
    background-color: rgba(255, 255, 255, 0.3);
    font-weight: bold;
}

main {
    flex: 1;
    padding: 2rem 0;
}

.page-title {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #667eea;
    text-align: center;
}

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

.card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.card-content {
    padding: 1.5rem;
}

.card-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.card-author {
    color: #666;
    font-size: 0.9rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: opacity 0.3s;
}

.btn:hover {
    opacity: 0.9;
}

.btn-secondary {
    background: #666;
}

.form-container {
    max-width: 400px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #333;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.detail-container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.detail-image {
    width: 100%;
    max-height: 500px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 5rem;
    min-height: 300px;
}

.detail-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #333;
}

.detail-meta {
    color: #666;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #eee;
}

.detail-content {
    line-height: 1.8;
    color: #555;
    margin-bottom: 2rem;
}

.contact-box {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 10px;
    margin-top: 2rem;
}

.contact-box h3 {
    margin-bottom: 1rem;
    color: #333;
}

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

.contact-hidden {
    color: #999;
    cursor: pointer;
    padding: 0.5rem 1rem;
    background: #e9ecef;
    border-radius: 5px;
    display: inline-block;
    transition: background-color 0.3s;
}

.contact-hidden:hover {
    background: #dee2e6;
}

.contact-revealed {
    color: #333;
    font-weight: bold;
}

.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    color: #667eea;
    text-decoration: none;
}

.back-link:hover {
    text-decoration: underline;
}

.notice {
    background: #fff3cd;
    border: 1px solid #ffc107;
    padding: 1rem;
    border-radius: 5px;
    margin-bottom: 1.5rem;
    color: #856404;
}

.price-tag {
    background: #dc3545;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    display: inline-block;
    margin-bottom: 1rem;
    font-weight: bold;
}

footer {
    background: #333;
    color: white;
    padding: 1.5rem 0;
    text-align: center;
    margin-top: auto;
}

.image-upload-area {
    border: 2px dashed #ddd;
    padding: 2rem;
    text-align: center;
    border-radius: 10px;
    cursor: pointer;
    transition: border-color 0.3s;
}

.image-upload-area:hover {
    border-color: #667eea;
}

.image-upload-area input[type="file"] {
    display: none;
}

.image-preview {
    max-width: 100%;
    max-height: 300px;
    margin-top: 1rem;
    border-radius: 10px;
}

.nav-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid #eee;
    padding-bottom: 1rem;
}

.nav-tab {
    padding: 0.75rem 1.5rem;
    background: #f5f5f5;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
}

.nav-tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 2rem;
    text-align: center;
    border-radius: 10px;
    margin-bottom: 3rem;
}

.hero-section h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.banner {
    width: 100%;
    margin-bottom: 2rem;
    border-radius: 10px;
    overflow: hidden;
}

.banner img {
    width: 100%;
    height: auto;
    display: block;
}

.section-title {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: #333;
    text-align: center;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
    }

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

    .hero-section h1 {
        font-size: 2rem;
    }

    .page-title {
        font-size: 1.5rem;
    }
}