/* ==================== 全局变量 ==================== */
:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --bg-body: #f1f5f9;
    --bg-card: #ffffff;
    --bg-header: rgba(241, 245, 249, 0.85);
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
    --radius: 8px;
    --transition: 0.2s ease;
    --modal-bg: rgba(15, 23, 42, 0.6);
    --spinner-color: #3b82f6;
    --btn-bg: rgba(0, 0, 0, 0.45);
    --btn-bg-hover: rgba(0, 0, 0, 0.75);
    --btn-color: #ffffff;
    --btn-size: 40px;
    --btn-font-size: 1.2rem;
    --switch-bg: #cbd5e1;
    --switch-checked-bg: #3b82f6;
    --switch-handle: #ffffff;
    --logo-size: 32px;
}

[data-theme="dark"] {
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-header: rgba(15, 23, 42, 0.9);
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.4);
    --modal-bg: rgba(0, 0, 0, 0.7);
    --spinner-color: #60a5fa;
    --btn-bg: rgba(255, 255, 255, 0.15);
    --btn-bg-hover: rgba(255, 255, 255, 0.3);
    --btn-color: #f1f5f9;
    --switch-bg: #475569;
    --switch-checked-bg: #60a5fa;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    transition: background-color var(--transition), color var(--transition);
    line-height: 1.5;
    padding: 0 20px 40px;
    -webkit-font-smoothing: antialiased;
}

/* ==================== 头部 ==================== */
.header {
    max-width: 1400px;
    margin: 0 auto 28px;
    padding: 18px 0 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-header);
    backdrop-filter: blur(6px);
    position: sticky;
    top: 0;
    z-index: 10;
    transition: background-color var(--transition), border-color var(--transition);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-logo {
    width: var(--logo-size);
    height: var(--logo-size);
    object-fit: contain;
    flex-shrink: 0;
    border-radius: 4px;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    transition: color var(--transition);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* ==================== 搜索栏（默认收起，按钮居中） ==================== */
.search-wrapper {
    display: flex;
    align-items: center;
    width: 40px;
    height: 40px;
    transition: width 0.3s ease;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    overflow: hidden;
    flex-shrink: 0;
    background-color: var(--bg-card);
    transition: width 0.3s ease, border-color 0.2s, box-shadow 0.2s;
}

.search-wrapper.expanded {
    width: 220px;
    border-color: var(--border-color); /* 去掉高亮色，扁平 */
    box-shadow: var(--shadow); /* 保持统一阴影 */
}

.search-wrapper input {
    flex: 0;
    width: 0;
    height: 100%;
    border: none;
    outline: none;
    padding: 0;
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-primary);
    background: transparent;
    opacity: 0;
    transition: flex 0.3s ease, width 0.3s ease, padding 0.3s ease, opacity 0.25s ease;
}

.search-wrapper.expanded input {
    flex: 1;
    width: 100%;
    padding: 0 10px 0 14px;
    opacity: 1;
}

.search-wrapper input::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

/* 搜索按钮 - 固定尺寸，始终可见，居中 */
.search-toggle {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.1rem;
    cursor: pointer;
    transition: color 0.2s;
    outline: none;
    border-radius: var(--radius);
}
.search-toggle:hover {
    color: var(--primary);
}
.search-toggle:focus-visible {
    outline: 1px solid var(--border-color); /* 辅助功能保留轻微轮廓 */
}

/* 输入框任何状态下都不要光晕 */
.search-wrapper input:focus {
    outline: none;
    box-shadow: none;
}

/* ==================== 滑动开关（太阳/月亮） ==================== */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 56px;
    height: 30px;
    flex-shrink: 0;
    cursor: pointer;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--switch-bg);
    border-radius: 30px;
    transition: background-color 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 8px;
}

.slider .sun,
.slider .moon {
    font-size: 14px;
    line-height: 1;
    transition: opacity 0.2s ease;
    pointer-events: none;
    color: #fff;
    opacity: 0.4;
}
.slider .sun {
    opacity: 1;
}
.slider .moon {
    opacity: 0.4;
}

.slider::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    background-color: var(--switch-handle);
    border-radius: 50%;
    transition: transform 0.25s ease, background-color 0.25s ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.theme-switch input:checked + .slider {
    background-color: var(--switch-checked-bg);
}
.theme-switch input:checked + .slider .sun {
    opacity: 0.4;
}
.theme-switch input:checked + .slider .moon {
    opacity: 1;
}
.theme-switch input:checked + .slider::after {
    transform: translateX(26px);
}

/* ==================== 图片网格 ==================== */
.gallery-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.gallery-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s, background-color var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    will-change: transform;
    contain: content;
}

.gallery-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.gallery-card .image-wrap {
    position: relative;
    width: 100%;
    aspect-ratio: 4 / 3;
    background-color: var(--bg-body);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.gallery-card .image-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: opacity 0.3s ease;
}

.gallery-card .spinner {
    position: absolute;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 3px solid var(--border-color);
    border-top-color: var(--spinner-color);
    animation: spin 0.8s linear infinite;
    pointer-events: none;
}

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

.gallery-card .image-wrap.loaded .spinner {
    display: none;
}

.gallery-card .error-overlay {
    position: absolute;
    inset: 0;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-body);
    color: var(--text-secondary);
    padding: 20px;
    text-align: center;
    gap: 12px;
    pointer-events: auto;
}
.gallery-card .error-overlay.visible {
    display: flex;
}
.gallery-card .error-overlay .error-icon {
    font-size: 2rem;
    opacity: 0.6;
}
.gallery-card .error-overlay .error-text {
    font-size: 0.9rem;
    color: var(--text-muted);
}
.gallery-card .error-overlay .retry-btn {
    padding: 6px 20px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
}
.gallery-card .error-overlay .retry-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.gallery-card .card-description {
    padding: 10px 14px 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: color var(--transition);
    word-break: break-word;
    background: transparent;
    border-top: 1px solid var(--border-color);
}

/* ==================== 模态框 ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--modal-bg);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 30px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.modal-content {
    background: var(--bg-card);
    border-radius: var(--radius);
    max-width: 92vw;
    max-height: 92vh;
    padding: 16px 20px 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color var(--transition);
    border: 1px solid var(--border-color);
}

.modal-image-wrapper {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-image {
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border-radius: 4px;
    background: var(--bg-body);
}

.modal-btn {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--btn-bg);
    color: var(--btn-color);
    border: none;
    border-radius: var(--radius);
    width: var(--btn-size);
    height: var(--btn-size);
    font-size: var(--btn-font-size);
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
    user-select: none;
    backdrop-filter: blur(2px);
    z-index: 5;
    font-weight: 300;
    line-height: 1;
}
.modal-btn:hover {
    background: var(--btn-bg-hover);
    transform: scale(1.05);
}
.modal-btn:active {
    transform: scale(0.92);
}

.modal-toolbar {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    gap: 8px;
    z-index: 6;
}
.modal-toolbar .modal-btn {
    position: relative;
    top: auto;
    right: auto;
    transform: none;
}

.modal-prev {
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
}
.modal-next {
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
}
.modal-prev:hover,
.modal-next:hover {
    transform: translateY(-50%) scale(1.05);
}
.modal-prev:active,
.modal-next:active {
    transform: translateY(-50%) scale(0.92);
}

.modal-description {
    margin-top: 16px;
    font-size: 1.15rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 85%;
    line-height: 1.7;
    padding: 0 4px;
}

/* ==================== 服务器链接按钮（与搜索框统一毛玻璃效果） ==================== */
.server-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    color: var(--text-secondary);
    font-size: 1.1rem;
    text-decoration: none;
    transition: color 0.2s, background 0.2s, box-shadow 0.2s, border-color 0.2s;
    cursor: pointer;
    flex-shrink: 0;
}
.server-link:hover {
    color: var(--primary);
    background: var(--bg-body); /* 悬停时轻微变色，与搜索按钮一致 */
    border-color: var(--border-color);
    box-shadow: var(--shadow);
}

/* ==================== 搜索无结果提示 ==================== */
.no-result {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 0;
    color: var(--text-muted);
    font-size: 1rem;
    display: none;
}
.no-result.visible {
    display: block;
}

/* ==================== 响应式 ==================== */
@media (max-width: 640px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
    }
    .site-title {
        font-size: 1.2rem;
    }
    .header-left {
        gap: 8px;
    }
    :root {
        --logo-size: 24px;
    }
    .header-right {
        gap: 10px;
    }
    .search-wrapper {
        width: 34px;
        height: 34px;
    }
    .search-wrapper.expanded {
        width: 160px;
    }
    .search-toggle {
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }
    .search-wrapper input {
        font-size: 0.8rem;
    }
    .theme-switch {
        width: 48px;
        height: 26px;
    }
    .slider::after {
        width: 20px;
        height: 20px;
        top: 3px;
        left: 3px;
    }
    .theme-switch input:checked + .slider::after {
        transform: translateX(22px);
    }
    .slider .sun,
    .slider .moon {
        font-size: 12px;
    }
    .modal-content {
        padding: 12px 12px 16px;
        max-width: 98vw;
    }
    :root {
        --btn-size: 34px;
        --btn-font-size: 1rem;
    }
    .modal-toolbar {
        top: 8px;
        right: 8px;
        gap: 6px;
    }
    .modal-prev {
        left: 6px;
    }
    .modal-next {
        right: 6px;
    }
    .modal-description {
        font-size: 1rem;
        margin-top: 12px;
    }
    .server-link {
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }
}