/* CSS 变量定义，方便统一管理颜色和尺寸 */
:root {
    --primary-color: #6366f1; /* 主色调：靛蓝色 */
    --primary-light: #818cf8; /* 主色调浅色 */
    --primary-dark: #4f46e5; /* 主色调深色 */
    --secondary-color: #10b981; /* 辅助色：绿色 */
    --text-primary: #1e293b; /* 主文本色 */
    --text-secondary: #64748b; /* 次要文本色 */
    --bg-primary: #ffffff; /* 主背景色 */
    --bg-secondary: #f8fafc; /* 次要背景色 */
    --bg-gradient: linear-gradient(135deg, #f5f7ff 0%, #eef2ff 100%); /* 渐变背景 */
    --border-color: #e2e8f0; /* 边框颜色 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.375rem;
    --border-radius-lg: 0.5rem;
    --border-radius-xl: 0.75rem;
    --border-radius-2xl: 1rem;
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

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

body {
    font-family: 'Inter', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 4px;
    transition: background-color var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

/* 模态框背景和动画 */
.modal-overlay {
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.open {
    opacity: 1;
}

.modal-container {
    transform: translateY(20px) scale(0.95);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.open .modal-container {
    transform: translateY(0) scale(1);
    opacity: 1;
}

/* 加载动画 */
.loader {
    border: 5px solid var(--border-color);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 按钮悬停效果 */
.btn-primary {
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background-color: var(--primary-dark);
}

/* 卡片悬停效果 */
.card-hover-effect {
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card-hover-effect::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.card-hover-effect:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.card-hover-effect:hover::before {
    left: 100%;
}

/* 工具提示样式 */
.tooltip-container {
    position: relative;
    display: inline-block;
}

.tooltip-text {
    visibility: hidden;
    width: auto;
    background-color: #1e293b;
    color: #fff;
    text-align: center;
    border-radius: var(--border-radius-md);
    padding: 8px 12px;
    position: absolute;
    z-index: 100;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: all var(--transition-normal);
    white-space: nowrap;
    box-shadow: var(--shadow-md);
    font-size: 0.875rem;
}

.tooltip-container:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

.tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #1e293b transparent transparent transparent;
}

/* 超链接悬停效果 */
.link-hover {
    transition: all var(--transition-fast);
    position: relative;
    display: inline-block;
}

.link-hover:hover {
    color: var(--primary-color);
    transform: translateY(-1px);
}

/* 回到顶部按钮样式 */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 40;
    background-color: var(--primary-color);
    color: white;
    padding: 12px;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
}

#back-to-top.show {
    opacity: 1;
    visibility: visible;
}

#back-to-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* 搜索框焦点效果 */
#searchInput:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* 筛选标签样式 */
.filter-tag {
    transition: all var(--transition-fast);
}

.filter-tag:hover {
    transform: translateY(-1px);
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn var(--transition-normal) ease-out;
}

/* 骨架屏加载效果 */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* 移动端优化样式 */
@media (max-width: 640px) {
    /* 优化卡片网格在小屏幕上的显示 */
    #item-grid {
        grid-template-columns: 1fr !important;
        gap: 1.5rem !important;
    }

    /* 优化标题大小 */
    h1 {
        font-size: 1.75rem !important;
    }

    /* 优化搜索框大小和位置 */
    #searchInput {
        font-size: 0.875rem;
    }

    /* 优化模态框在小屏幕上的显示 */
    .modal-container {
        margin: 1rem;
        max-height: calc(100vh - 2rem);
    }

    /* 优化详情页布局 */
    #modal-content {
        padding: 1.5rem !important;
    }

    /* 优化移动端的按钮和交互元素大小 */
    button, a {
        touch-action: manipulation;
    }

    /* 回到顶部按钮在移动端上更小一些 */
    #back-to-top {
        bottom: 20px;
        right: 20px;
        padding: 10px;
    }
}

/* 平板设备优化 */
@media (min-width: 641px) and (max-width: 1024px) {
    /* 优化卡片网格在平板上的显示 */
    #item-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

/* 滚动进度指示器 */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    z-index: 1000;
    width: 0%;
    transition: width 0.15s ease-out;
}

/* 项目卡片悬停效果增强 */
.item-card {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 16px;
    overflow: hidden;
    position: relative;
}

.item-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px -10px rgba(79, 70, 229, 0.25), 0 4px 8px -2px rgba(79, 70, 229, 0.15);
}

.item-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(120deg, rgba(79, 70, 229, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.item-card:hover::after {
    opacity: 1;
}

/* 优化移动端筛选标签 */
.filter-tag {
    transition: all 0.2s ease;
}

.filter-tag.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.4);
}

/* 模态框动画增强 */
.modal {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    transform: scale(0.95);
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease;
}

.modal.active .modal-content {
    transform: scale(1);
    opacity: 1;
}

/* 移动端模态框优化 */
@media (max-width: 768px) {
    .modal-content {
        margin: 0.5rem;
        max-height: calc(100vh - 1rem);
        border-radius: 16px;
    }

    /* 确保模态框内的图片适应屏幕宽度 */
    #modal-img {
        width: 100%;
        height: auto;
        object-fit: contain;
        max-height: 250px;
    }

    /* 优化下载项在移动端的显示 */
    .modal-download-item {
        padding: 3px 8px;
        margin: 2px;
        font-size: 0.85rem;
    }

    /* 优化卡片网格在移动端的显示 */
    #item-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 增强加载动画 */
.loader {
    width: 48px;
    height: 48px;
    border: 3px solid var(--primary-color);
    border-bottom-color: transparent;
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* 全局隐藏滚动条，但为模态框（详细页）保留滚动条 */
body::-webkit-scrollbar {
    width: 0;
    height: 0;
}

body::-webkit-scrollbar-track {
    background: transparent;
}

body::-webkit-scrollbar-thumb {
    background: transparent;
}

/* 为模态框（详细页）添加自定义滚动条 */
.modal-container::-webkit-scrollbar {
    width: 8px;
}

.modal-container::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 4px;
}

.modal-container::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 4px;
    transition: background-color var(--transition-fast);
}

.modal-container::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}