/* 前端展示页面样式 - 仿 Volantis 模块化卡片风格 */
:root {
    --primary-color: #1890ff;
    --secondary-color: #40a9ff;
    --text-color: #333333;
    --light-text-color: #666666;
    --container-max-width: 1100px;
    --border-radius-size: 16px;
    --card-shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
    --card-shadow-hover: 0 22px 55px rgba(15, 23, 42, 0.18);
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--text-color);
    overflow-x: hidden;
    background: #f0f2f5;
}

.container {
    max-width: var(--container-max-width);
    margin: 40px auto;
    padding: 40px 32px;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    position: relative;
    z-index: 1;
    background: #ffffff;
    border-radius: var(--border-radius-size);
    box-shadow: var(--card-shadow);
}

.container:not(.initial-hidden) {
    opacity: 1;
    transform: translateY(0);
}

h1 {
    text-align: center;
    color: var(--primary-color);
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.subtitle {
    text-align: center;
    color: var(--light-text-color);
    font-size: 16px;
    margin-bottom: 40px;
    letter-spacing: 0.3px;
}

/* 搜索框样式 */
.search-section {
    margin-bottom: 32px;
}

.search-box {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-box input {
    width: 100%;
    padding: 16px 50px 16px 48px;
    border: 2px solid #e5eaf0;
    border-radius: 14px;
    background: #ffffff;
    color: #111827;
    font-size: 16px;
    box-sizing: border-box;
    transition: all 0.25s ease;
    font-family: inherit;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(24, 144, 255, 0.12), 0 4px 12px rgba(24, 144, 255, 0.08);
    transform: translateY(-1px);
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    pointer-events: none;
}

.clear-search {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: #e5eaf0;
    border: none;
    border-radius: 50%;
    width: 28px;
    height: 28px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #666;
    transition: all 0.2s ease;
}

.clear-search:hover {
    background: #c0d3ff;
    color: #333;
}

.search-results {
    margin-top: 20px;
    padding: 20px;
    background: #ffffff;
    border: 1px solid #e5eaf0;
    border-radius: 14px;
    box-shadow: var(--card-shadow);
}

.search-results .result-count {
    color: var(--light-text-color);
    font-size: 14px;
    margin-bottom: 16px;
}

.search-results .no-results {
    text-align: center;
    padding: 40px 20px;
    color: var(--light-text-color);
}

.search-highlight {
    background: linear-gradient(120deg, #fff3cd 0%, #ffe69c 100%);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
    color: #856404;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* 分类筛选按钮 */
.category-filter {
    margin-top: 16px;
}

.filter-btn {
    padding: 8px 16px;
    border: 2px solid #e5eaf0;
    border-radius: 20px;
    background: #ffffff;
    color: var(--text-color);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
}

.filter-btn:hover {
    border-color: var(--primary-color);
    background: rgba(24, 144, 255, 0.05);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(24, 144, 255, 0.15);
}

.filter-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(24, 144, 255, 0.3);
}

.filter-btn.active:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(24, 144, 255, 0.4);
}

/* 公告卡片 */
.announcement {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid #e5eaf0;
    border-radius: var(--border-radius-size);
    padding: 32px 36px;
    margin-bottom: 32px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.announcement::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.announcement:hover {
    transform: translateY(-6px);
    box-shadow: var(--card-shadow-hover);
}

.announcement h2 {
    font-size: 22px;
    margin-bottom: 24px;
    color: var(--primary-color);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: -0.3px;
}

.announcement h2::before {
    content: '📢';
    font-size: 24px;
    filter: drop-shadow(0 2px 4px rgba(24, 144, 255, 0.2));
}

.announcement-item {
    margin-top: 20px;
    padding: 20px 24px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(24, 144, 255, 0.15);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: all 0.25s ease;
    position: relative;
}

.announcement-item:hover {
    background: rgba(255, 255, 255, 1);
    border-color: rgba(24, 144, 255, 0.3);
    box-shadow: 0 4px 16px rgba(24, 144, 255, 0.12);
    transform: translateX(4px);
}

.announcement-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 0 4px 4px 0;
}

.announcement-item strong {
    display: block;
    font-size: 18px;
    color: #111827;
    font-weight: 700;
    margin-bottom: 12px;
    padding-left: 16px;
    position: relative;
}

.announcement-item strong::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 16px;
}

.announcement-content {
    margin-top: 12px;
    line-height: 1.8;
    color: #374151;
    padding-left: 16px;
    font-size: 15px;
}

.announcement-content p {
    margin: 10px 0;
}

.announcement-content a {
    color: var(--primary-color);
    text-decoration: underline;
    transition: all 0.25s ease;
}

.announcement-content a:hover {
    color: var(--secondary-color);
}

/* 如果链接有style属性，优先使用内联样式 */
.announcement-content a[style] {
    display: inline-block;
}

.announcement-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 8px 0;
}

.announcement-content ul,
.announcement-content ol {
    margin: 8px 0;
    padding-left: 24px;
}

.announcement-content li {
    margin: 4px 0;
}

.announcement-content h1,
.announcement-content h2,
.announcement-content h3,
.announcement-content h4,
.announcement-content h5,
.announcement-content h6 {
    margin: 12px 0 8px 0;
    font-weight: 600;
}

.announcement-content code {
    background: rgba(0, 0, 0, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
}

.announcement-content pre {
    background: rgba(0, 0, 0, 0.05);
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 8px 0;
}

.announcement-content blockquote {
    border-left: 3px solid var(--primary-color);
    padding-left: 16px;
    margin: 8px 0;
    color: #666;
    font-style: italic;
}

/* 公告项统一样式 */
.announcement-item {
    background: rgba(24, 144, 255, 0.06);
    border-left: 3px solid var(--primary-color);
}

/* 广告区域 */
.ads-section {
    margin: 32px 0;
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

.ad-item {
    display: block;
    border-radius: var(--border-radius-size);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    box-shadow: var(--card-shadow);
}

.ad-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

.ad-item img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 分类列表 */
#content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#content li {
    margin-bottom: 20px;
}

/* 分类折叠块 */
.toggle {
    background: #ffffff;
    border: 1px solid #e5eaf0;
    border-radius: var(--border-radius-size);
    box-shadow: var(--card-shadow);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.toggle[open] {
    transform: translateY(-2px);
    box-shadow: var(--card-shadow-hover);
}

.toggle summary {
    cursor: pointer;
    padding: 18px 24px;
    font-size: 18px;
    font-weight: 600;
    color: #111827;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    outline: none;
    transition: background 0.2s;
}

.toggle summary:hover {
    background: #f5f7fb;
}

.toggle summary::after {
    content: "（点击展开/收起）";
    font-size: 14px;
    color: var(--light-text-color);
    margin-left: 10px;
    font-weight: 400;
}

.toggle summary::-webkit-details-marker {
    display: none;
}

/* 项目卡片：左文字右截图 */
.card {
    background: #ffffff;
    border: 1px solid #e5eaf0;
    border-radius: var(--border-radius-size);
    padding: 20px 28px;
    margin: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    flex-wrap: wrap;
    gap: 24px;
    box-shadow: var(--card-shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

.info {
    flex: 1 1 60%;
    word-break: break-word;
    min-width: 0;
}

.info strong {
    display: block;
    margin-bottom: 10px;
    font-size: 20px;
    color: #111827;
    font-weight: 600;
    line-height: 1.4;
}

.info span,
.project-desc {
    display: block;
    padding: 10px 16px;
    border-radius: 12px;
    font-size: 14px;
    color: #555555;
    background: #f5f7fb;
    margin-bottom: 8px;
    line-height: 1.6;
    word-break: break-word;
    white-space: pre-wrap;
}

/* 右侧截图 */
.project-image {
    flex: 0 0 auto;
    margin-left: auto;
}

.project-image img {
    max-width: 240px;
    height: auto;
    border-radius: var(--border-radius-size);
    box-shadow: 0 12px 30px rgba(15, 23, 42, 0.22);
    transition: transform 0.25s ease;
}

.card:hover .project-image img {
    transform: scale(1.02);
}

/* 下载按钮组 */
.project-buttons {
    margin-top: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.download-btn {
    background: var(--primary-color);
    color: #ffffff;
    border: 1px solid var(--primary-color);
    padding: 10px 20px;
    border-radius: 14px;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    font-size: 14px;
    transition: background 0.25s, box-shadow 0.25s, transform 0.2s;
}

.download-btn:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    box-shadow: 0 10px 24px rgba(24, 144, 255, 0.45);
    transform: translateY(-1px);
}

.download-btn.btn-primary {
    background: #2196f3;
    border-color: #2196f3;
}

.download-btn.btn-success {
    background: #4caf50;
    border-color: #4caf50;
}

.download-btn.btn-warning {
    background: #ff9800;
    border-color: #ff9800;
}

.download-btn.btn-danger {
    background: #f44336;
    border-color: #f44336;
}

/* 底部提交项目区域 */
.submit-section {
    margin-top: 48px;
    padding: 40px 36px;
    background: #ffffff;
    border: 1px solid #e5eaf0;
    border-radius: var(--border-radius-size);
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.submit-section:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

.submit-section h2 {
    color: #111827;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
}

.submit-section p {
    color: var(--light-text-color);
    margin-bottom: 20px;
}

.submit-btn {
    display: inline-block;
    background: var(--primary-color);
    color: #ffffff;
    padding: 14px 36px;
    border-radius: 14px;
    text-decoration: none;
    font-weight: 600;
    margin-top: 8px;
    font-size: 15px;
    transition: background 0.25s, box-shadow 0.25s, transform 0.2s;
    border: 1px solid var(--primary-color);
}

.submit-btn:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    box-shadow: 0 12px 28px rgba(24, 144, 255, 0.45);
    transform: translateY(-1px);
}

/* 返回顶部按钮 */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--primary-color);
    color: #ffffff;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.8em;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 8px 20px rgba(24, 144, 255, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s, background 0.3s, transform 0.2s;
    z-index: 999;
}

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

#back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(24, 144, 255, 0.5);
}

@media (max-width: 768px) {
    .container {
        padding: 24px 20px;
        margin: 20px auto;
    }
    
    h1 {
        font-size: 28px;
    }
    
    .card {
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        margin: 12px 16px;
    }
    
    .project-image {
        margin-left: 0;
        width: 100%;
    }
    
    .project-image img {
        max-width: 100%;
        width: 100%;
    }
    
    .submit-section {
        padding: 28px 24px;
    }
}