/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --accent-color: #c0392b;
    --text-color: #34495e;
    --text-light: #7f8c8d;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.8;
    color: var(--text-color);
    background: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: float 20s linear infinite;
}

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

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

header .subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    position: relative;
    z-index: 1;
}

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

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

/* Article Card */
.article-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.article-card .image-container {
    width: 100%;
    height: 220px;
    overflow: hidden;
    position: relative;
}

.article-card .image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.article-card:hover .image-container img {
    transform: scale(1.1);
}

.article-card .content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card .category {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 1rem;
    align-self: flex-start;
}

.article-card h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.article-card .meta {
    display: flex;
    gap: 1rem;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.article-card .meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.article-card .excerpt {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 1rem;
}

.article-card .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: auto;
}

.article-card .tag {
    background: #f1f3f5;
    color: var(--text-light);
    padding: 0.3rem 0.7rem;
    border-radius: 15px;
    font-size: 0.8rem;
    transition: var(--transition);
}

.article-card:hover .tag {
    background: #e9ecef;
    color: var(--primary-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: white;
    border-radius: var(--border-radius);
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 2rem;
    color: var(--text-light);
    cursor: pointer;
    z-index: 10;
    transition: var(--transition);
    background: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--accent-color);
    transform: rotate(90deg);
}

.modal-image {
    width: 100%;
    height: 350px;
    object-fit: cover;
}

.modal-body {
    padding: 2.5rem;
}

.modal-category {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.modal-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.modal-meta {
    display: flex;
    gap: 2rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #e9ecef;
}

.modal-poem {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    text-align: center;
    font-size: 1.3rem;
    line-height: 2;
    color: var(--primary-color);
    font-weight: 500;
    white-space: pre-line;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.05);
}

.modal-appreciation {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-color);
}

.modal-appreciation h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.modal-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e9ecef;
}

.modal-tag {
    background: #f1f3f5;
    color: var(--text-light);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-light);
    margin-top: 4rem;
}

footer .icp-beian {
    margin-top: 1rem;
}

footer .icp-beian a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

footer .icp-beian a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    header .subtitle {
        font-size: 1rem;
    }

    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .container {
        padding: 1rem;
    }

    .modal-body {
        padding: 1.5rem;
    }

    .modal-image {
        height: 250px;
    }

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

    .modal-poem {
        font-size: 1.1rem;
        padding: 1.5rem;
    }

    .modal-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}

/* Loading Animation */
.loading {
    display: none;
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
}

.loading.active {
    display: block;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}