/* style.css */
:root {
    --bg-primary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #3b82f6;
    --accent-dark: #2563eb;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition: all 0.2s ease;
}

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

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* 头部样式 */
.site-header {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    padding: 2.5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.header-inner {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 2.2rem;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.2));
}

.site-header h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #fff, #94a3b8);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
}

.tagline {
    color: #cbd5e1;
    font-size: 0.95rem;
    margin-top: 0.25rem;
}

/* 主内容区 */
.site-main {
    flex: 1;
    padding: 2.5rem 0;
}

/* 搜索区域 */
.search-section {
    margin-bottom: 2.5rem;
}

.search-wrapper {
    position: relative;
    max-width: 600px;
    margin-bottom: 1rem;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    color: #94a3b8;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 0.9rem 2.8rem 0.9rem 2.8rem;
    font-size: 1rem;
    border: 1px solid var(--border);
    border-radius: 60px;
    background-color: white;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    outline: none;
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.clear-btn {
    position: absolute;
    right: 0.8rem;
    top: 50%;
    transform: translateY(-50%);
    background: #e2e8f0;
    border: none;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.8rem;
    color: #475569;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
}

.clear-btn.visible {
    opacity: 1;
    visibility: visible;
}

.clear-btn:hover {
    background: #cbd5e1;
    color: #0f172a;
}

.stats-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 0.5rem;
    font-weight: 500;
}

/* 资源网格布局 */
.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.75rem;
}

/* 卡片样式 */
.resource-card {
    background: var(--bg-card);
    border-radius: 1.25rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid var(--border);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: #cbd5e1;
}

.card-content {
    padding: 1.5rem;
    flex: 1;
}

.resource-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: inline-block;
}

.resource-name {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    line-height: 1.3;
}

.resource-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.resource-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.category-tag {
    background: #f1f5f9;
    padding: 0.2rem 0.7rem;
    border-radius: 30px;
    font-size: 0.7rem;
    font-weight: 500;
    color: #334155;
    letter-spacing: 0.3px;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    width: 100%;
    padding: 0.85rem;
    background: var(--accent);
    color: white;
    border: none;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 60px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: inherit;
    margin-top: auto;
}

.download-btn:hover {
    background: var(--accent-dark);
    transform: scale(0.98);
    box-shadow: 0 2px 8px rgba(59,130,246,0.3);
}

.download-btn:active {
    transform: scale(0.96);
}

/* 空状态样式 */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem 1.5rem;
    background: white;
    border-radius: 1.5rem;
    border: 1px solid var(--border);
}

.empty-emoji {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.7;
}

.empty-state p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.loading-placeholder {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* 底部 */
.site-footer {
    background-color: #ffffff;
    border-top: 1px solid var(--border);
    padding: 1.8rem 0;
    margin-top: 2rem;
    text-align: center;
}

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

.site-footer p {
    color: #64748b;
    font-size: 0.8rem;
}

.footer-note {
    font-size: 0.75rem;
    color: #94a3b8;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .container {
        padding: 0 1.2rem;
    }
    .resources-grid {
        grid-template-columns: 1fr;
        gap: 1.25rem;
    }
    .site-header {
        padding: 1.8rem 0;
    }
    .site-header h1 {
        font-size: 1.5rem;
    }
    .card-content {
        padding: 1.2rem;
    }
    .download-btn {
        padding: 0.7rem;
    }
}