/* ========================================
   bookmark-grid.css
   书签网格核心样式 + 全局背景适配 + 响应式布局
   ======================================== */

/* ----------------- 全局重置 ----------------- */
body, html {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    width: 100%;
    box-sizing: border-box;
}

/* ----------------- 背景容器样式 ----------------- */
.beijing {
    width: 100%;
    min-height: 100vh;
    background-image: url('../image/index-背景图.png');
    background-size: cover;
    background-position: top center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    /* 移除所有内边距，让内容自然撑开 */
    padding: 0;
    margin: 0;
    /* 确保背景覆盖整个区域 */
    position: relative;
}

/* 小屏幕时背景图自适应高度，防止底部空白 */
@media (max-width: 768px) {
    .beijing {
        background-attachment: scroll;
        background-position: top center;
        min-height: 100%;
    }
}

/* 超小屏幕额外确保背景填满 */
@media (max-width: 480px) {
    .beijing {
        background-size: cover;
        background-position: top center;
    }
}

/* ----------------- 书签网格容器 ----------------- */
.bookmark-grid {
    display: grid;
    /* 默认在大屏幕使用5列，内容铺满 */
    grid-template-columns: repeat(5, 1fr);
    gap: 28px 20px;
    /* 移除max-width限制，让内容撑满整个宽度，无两侧空白 */
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 40px 30px 60px 30px;
    box-sizing: border-box;
}

/* 中等屏幕: 笔记本 / 普通桌面 → 4列 */
@media (max-width: 1279px) and (min-width: 900px) {
    .bookmark-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 24px 20px;
        padding: 35px 25px 55px 25px;
    }
}

/* 平板设备: 768px - 899px → 3列 */
@media (max-width: 899px) and (min-width: 640px) {
    .bookmark-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px 18px;
        padding: 30px 20px 50px 20px;
    }
}

/* 手机横屏 / 小尺寸平板: 480px - 639px → 2列 */
@media (max-width: 639px) and (min-width: 480px) {
    .bookmark-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px 16px;
        padding: 25px 16px 45px 16px;
    }
}

/* 手机竖屏 (窄屏 ≤ 479px): 2列布局 */
@media (max-width: 479px) {
    .bookmark-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px 12px;
        padding: 20px 12px 40px 12px;
    }
}

/* 超小设备（≤380px）降为单列，同时背景自动适配 */
@media (max-width: 380px) {
    .bookmark-grid {
        grid-template-columns: 1fr;
        gap: 18px;
        padding: 20px 16px 40px 16px;
    }
}

/* ----------------- 单个书签卡片样式 ----------------- */
.bookmark-item {
    display: flex;
    /* flex-direction: column; */
    align-items: center;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    background-color: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(2px);
    border-radius: 24px;
    padding: 16px 8px 14px 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.bookmark-item a {
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    color: #1f2e3a;
    font-weight: 500;
    transition: color 0.2s;
}

.bookmark-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 15px 25px -10px rgba(0, 0, 0, 0.2);
    background-color: rgba(255, 255, 255, 0.85);
}

.bookmark-item a:hover {
    color: #0a5c8e;
}

/* 书签图片 */
.bookmark-item img {
    max-width: 80px;
    width: 100%;
    height: auto;
    margin-bottom: 12px;
    border-radius: 16px;
    transition: transform 0.25s ease;
    object-fit: contain;
    aspect-ratio: 1 / 1;
    background-color: #f8fafd;
    padding: 6px;
    box-sizing: border-box;
}

.bookmark-item:hover img {
    transform: scale(1.02);
}

/* 书签文字 */
.bookmark-item span {
    font-size: 0.95rem;
    line-height: 1.4;
    word-break: break-word;
    max-width: 100%;
    display: inline-block;
    padding: 0 4px;
    background: linear-gradient(135deg, rgba(0,0,0,0.02), transparent);
    border-radius: 20px;
}

/* 大屏幕稍微放大图片 */
@media (min-width: 1280px) {
    .bookmark-item img {
        max-width: 88px;
    }
    .bookmark-item span {
        font-size: 1rem;
    }
}

/* 中等屏幕图片尺寸 */
@media (max-width: 1279px) and (min-width: 900px) {
    .bookmark-item img {
        max-width: 76px;
    }
}

/* 平板屏幕图片尺寸 */
@media (max-width: 899px) and (min-width: 640px) {
    .bookmark-item {
        padding: 14px 6px 12px 6px;
    }
    .bookmark-item img {
        max-width: 70px;
    }
    .bookmark-item span {
        font-size: 0.9rem;
    }
}

/* 手机横屏图片尺寸 */
@media (max-width: 639px) and (min-width: 480px) {
    .bookmark-item {
        padding: 12px 6px 10px 6px;
    }
    .bookmark-item img {
        max-width: 68px;
        margin-bottom: 10px;
    }
    .bookmark-item span {
        font-size: 0.85rem;
    }
}

/* 手机竖屏图片尺寸 */
@media (max-width: 479px) {
    .bookmark-item {
        padding: 10px 5px 8px 5px;
        border-radius: 20px;
    }
    .bookmark-item img {
        max-width: 58px;
        margin-bottom: 8px;
    }
    .bookmark-item span {
        font-size: 0.75rem;
        font-weight: 500;
    }
}

/* 超小设备单列时改为横向布局 */
@media (max-width: 380px) {
    .bookmark-item {
        flex-direction: row;
        justify-content: flex-start;
        text-align: left;
        padding: 12px 16px;
        gap: 16px;
    }
    .bookmark-item a {
        flex-direction: row;
        justify-content: flex-start;
        gap: 16px;
        width: auto;
    }
    .bookmark-item img {
        max-width: 48px;
        margin-bottom: 0;
    }
    .bookmark-item span {
        font-size: 0.9rem;
        font-weight: 500;
    }
    .bookmark-item:hover {
        transform: translateY(-3px);
    }
}

/* ----------------- 触摸优化 ----------------- */
@media (hover: none) and (pointer: coarse) {
    .bookmark-item {
        cursor: pointer;
        -webkit-tap-highlight-color: transparent;
    }
    .bookmark-item a {
        padding: 4px 0;
    }
}

/* ----------------- 深色模式适配 ----------------- */
@media (prefers-color-scheme: dark) {
    .bookmark-item {
        background-color: rgba(30, 35, 48, 0.75);
        backdrop-filter: blur(3px);
        box-shadow: 0 5px 12px rgba(0, 0, 0, 0.3);
    }
    .bookmark-item a {
        color: #eef2ff;
    }
    .bookmark-item a:hover {
        color: #9ac9f0;
    }
    .bookmark-item img {
        background-color: #2a2e3c;
    }
}

/* ----------------- 入场动画 ----------------- */
.bookmark-item {
    animation: fadeSlideUp 0.3s ease backwards;
    animation-delay: calc(var(--order, 0) * 0.008s);
}

@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 图片加载占位效果 */
.bookmark-item img[src=""],
.bookmark-item img:not([src]) {
    opacity: 0.6;
    background: #e2e8f0;
    min-height: 60px;
}