@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-color: #212529;
    --subtle-text-color: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #007bff;
    --accent-color-hover: #0056b3;
    --shadow-color: rgba(0, 0, 0, 0.05);
}

body.dark-theme {
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #e0e0e0;
    --subtle-text-color: #a0a0a0;
    --border-color: #333333;
    --accent-color: #3a96ff;
    --accent-color-hover: #5fa4ff;
    --shadow-color: rgba(255, 255, 255, 0.05);
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

header {
    background: var(--card-background);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    transition: background-color 0.3s, border-color 0.3s;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

header h1 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 600;
}

.theme-switcher {
    position: relative;
}

.theme-toggle-checkbox {
    display: none;
}

.theme-toggle-label {
    cursor: pointer;
    font-size: 1.5rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    transition: transform 0.3s ease;
}

.theme-toggle-checkbox:checked + .theme-toggle-label {
    transform: rotate(180deg);
}

.theme-toggle-label::before {
    content: '☀️';
}

body.dark-theme .theme-toggle-label::before {
    content: '🌙';
}

.controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.filter-group, .search-filter-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
}

.time-filter-btn {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--subtle-text-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease-in-out;
}

.time-filter-btn:hover {
    background-color: var(--accent-color);
    color: var(--card-background);
    border-color: var(--accent-color);
}

.time-filter-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    font-weight: 600;
}

#search-input, #language-filter {
    padding: 0.6rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    min-width: 200px;
    background-color: var(--card-background);
    color: var(--text-color);
    transition: all 0.3s;
}

#search-input:focus, #language-filter:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

main {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

#repo-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    grid-auto-rows: 1fr; /* 確保所有行等高 */
    gap: 1.5rem;
}
.repo-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center; /* 確保所有子元素居中 */
    text-align: center; /* 確保文字內容居中 */
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background-color 0.3s, border-color 0.3s;
    height: 100%; /* 確保卡片高度填滿網格單元 */
    box-sizing: border-box; /* 包含padding在高度計算內 */
}

.repo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-color);
}

.repo-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    width: 100%;
}

.owner-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    object-fit: cover;
}

.repo-card h3 {
    margin: 0;
    font-size: 1.15rem;
    font-weight: 600;
    line-height: 1.3;
    width: 100%; /* 確保標題佔滿寬度以便居中 */
}

.repo-card h3 a {
    text-decoration: none;
    color: var(--text-color);
    transition: color 0.3s;
}

.repo-card h3 a:hover {
    color: var(--accent-color);
}

.repo-description {
    flex-grow: 1;
    font-size: 0.95rem;
    color: var(--subtle-text-color);
    margin: 0 0 1.5rem 0;
    transition: color 0.3s;
    text-align: center;
    padding: 0 1rem;
    max-width: 100%;
    width: 100%;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    min-height: 4.8em; /* 3 * 1.6em */
}

.repo-meta {
    font-size: 0.9rem;
    color: var(--subtle-text-color);
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    transition: color 0.3s;
}

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

.error-message, #repo-container p {
    color: var(--subtle-text-color);
    text-align: center;
    width: 100%;
    font-size: 1.1rem;
    padding: 2rem;
}

@media (min-width: 768px) {
    .controls {
        flex-direction: row;
        justify-content: space-between;
    }
}

.pagination-container {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem 0;
    gap: 0.5rem;
}

.pagination-btn {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.pagination-btn:hover {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.pagination-btn.active {
    background-color: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    font-weight: bold;
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-ellipsis {
    padding: 0.5rem;
    color: var(--subtle-text-color);
}