/* CSS 变量 - 主题 */
:root {
    --bg-color: #f5f5f5;
    --text-color: #333;
    --card-bg: #fff;
    --card-shadow: 0 2px 8px rgba(0,0,0,0.1);
    --accent-color: #4a90e2;
    --header-bg: rgba(255,255,255,0.9);
    --modal-bg: rgba(0,0,0,0.9);
    --modal-text: #fff;
    --border-color: #e0e0e0;
    --loading-color: #ccc;
}


/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
}

/* 头部 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 2px;
}




/* 主内容区 */
main {
    padding: 6rem 2rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* 网格布局 */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.photo-card {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    border-radius: 8px;
    background-color: var(--card-bg);
    box-shadow: var(--card-shadow);
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.photo-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.photo-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.photo-card:hover img {
    transform: scale(1.05);
}

.photo-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: white;
    opacity: 0;
    transition: opacity 0.3s;
}

.photo-card:hover .photo-overlay {
    opacity: 1;
}

.photo-overlay h3 {
    font-size: 0.9rem;
    font-weight: 400;
    margin-bottom: 0.25rem;
}

.photo-overlay .date {
    font-size: 0.75rem;
    opacity: 0.8;
}

/* 加载动画 */
.loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: 3rem;
    color: var(--loading-color);
    font-size: 1.2rem;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--loading-color);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* 加载指示器 */
.loader {
    grid-column: 1 / -1;
    text-align: center;
    padding: 2rem;
}

.loader .loading {
    grid-column: auto;
    padding: 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--modal-bg);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    position: relative;
    max-width: 95%;
    max-height: 95%;
    display: flex;
    gap: 2rem;
    align-items: center;
    justify-content: center;
}

.modal-content img {
    max-width: 65%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
    transition: transform 0.1s ease-out;
    pointer-events: auto;
    z-index: 10;
    position: relative;
}

.photo-info {
    color: var(--modal-text);
    min-width: 280px;
    max-width: 350px;
    z-index: 1;
    position: relative;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    backdrop-filter: blur(10px);
    overflow-y: auto;
    max-height: 85vh;
}

.photo-info h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.info-grid {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
    grid-template-columns: 1fr;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.label {
    font-size: 0.8rem;
    opacity: 0.7;
}

.value {
    font-size: 0.95rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
    white-space: normal;
    line-height: 1.4;
}

.modal-actions {
    display: flex;
    gap: 1rem;
}

.action-btn {
    padding: 0.6rem 1.2rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.action-btn:hover {
    opacity: 0.9;
}

.close-btn {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.close-btn:hover {
    opacity: 1;
}

/* Toast 提示 */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-color);
    color: var(--bg-color);
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    opacity: 0;
    transition: opacity 0.3s;
    z-index: 2000;
}

.toast.show {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header {
        padding: 1rem;
    }

    header h1 {
        font-size: 1.2rem;
    }

    main {
        padding: 5rem 1rem 1rem;
    }

    .gallery {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 0.8rem;
    }

    .modal-content {
        flex-direction: column;
        max-width: 95%;
    }

    .modal-content img {
        max-width: 100%;
        max-height: 50vh;
    }

    .photo-info {
        max-width: 100%;
        text-align: center;
    }

    .modal-actions {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .photo-overlay {
        opacity: 1;
        padding: 0.5rem;
    }

    .photo-overlay h3 {
        font-size: 0.75rem;
    }

    .photo-overlay .date {
        font-size: 0.65rem;
    }
}