/* 折纸风格银灰色调主题 */
:root {
    --primary-color: #6c757d;
    --secondary-color: #adb5bd;
    --paper-white: #f8f9fa;
    --paper-gray: #e9ecef;
    --paper-shadow: 0 3px 10px rgba(0,0,0,0.1);
    --fold-size: 15px;
    --fold-color: rgba(0,0,0,0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Arial, sans-serif;
}

body {
    background-color: var(--paper-gray);
    color: #495057;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

a:hover {
    color: #343a40;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 折纸风格头部 */
header {
    background-color: var(--paper-white);
    padding: 20px 0;
    box-shadow: var(--paper-shadow);
    position: relative;
    border-bottom: 1px solid #dee2e6;
}

/* 折纸折叠效果 */
header::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    border-width: 0 var(--fold-size) var(--fold-size) 0;
    border-style: solid;
    border-color: var(--paper-gray) var(--fold-color);
    display: block;
    width: 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 28px;
    font-weight: 700;
    color: #343a40;
    position: relative;
    padding-left: 15px;
}

/* 折纸折痕效果 */
.logo::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    bottom: 5px;
    width: 4px;
    background-color: var(--primary-color);
    transform: skewX(-20deg);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 15px;
}

nav ul li a {
    padding: 8px 15px;
    background-color: var(--paper-gray);
    border-radius: 3px;
    font-weight: 500;
    box-shadow: var(--paper-shadow);
}

nav ul li a:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 折纸卡片效果 */
.main-content {
    background-color: var(--paper-white);
    padding: 30px;
    margin: 30px 0;
    box-shadow: var(--paper-shadow);
    position: relative;
    border-radius: 2px;
}

/* 折纸卡片折叠角 */
.main-content::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    border-width: 0 0 var(--fold-size) var(--fold-size);
    border-style: solid;
    border-color: var(--paper-gray) var(--fold-color);
}

.section-title {
    font-size: 24px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #dee2e6;
    color: #343a40;
    position: relative;
}

/* 标题折痕效果 */
.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 100px;
    height: 2px;
    background-color: var(--primary-color);
    transform: skewX(-30deg);
}

/* 折纸网格布局 */
.article-origami-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.origami-card {
    background-color: var(--paper-white);
    border-radius: 2px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--paper-shadow);
    position: relative;
    border: 1px solid #dee2e6;
}

/* 卡片折叠效果 */
.origami-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    border-width: 0 var(--fold-size) var(--fold-size) 0;
    border-style: solid;
    border-color: var(--paper-gray) var(--fold-color);
}

.origami-card:hover {
    transform: translateY(-5px) rotate(1deg);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.origami-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid #dee2e6;
}

.origami-body {
    padding: 20px;
}

.origami-title {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 600;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: #343a40;
}

.origami-meta {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: var(--secondary-color);
    margin-top: 15px;
}

/* 分类标签折纸效果 */
.category-label {
    display: inline-block;
    padding: 3px 10px;
    background-color: var(--paper-gray);
    color: var(--primary-color);
    border-radius: 2px;
    font-size: 12px;
    margin-bottom: 10px;
    box-shadow: var(--paper-shadow);
    transform: skewX(-10deg);
}

/* 文章详情页折纸效果 */
.origami-detail {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

/* 详情页折叠角 */
.origami-detail::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    border-width: 0 var(--fold-size) var(--fold-size) 0;
    border-style: solid;
    border-color: var(--paper-gray) var(--fold-color);
}

.origami-header {
    margin-bottom: 40px;
    text-align: center;
    padding: 20px;
    background-color: var(--paper-white);
    box-shadow: var(--paper-shadow);
    position: relative;
}

.origami-title-large {
    font-size: 32px;
    margin-bottom: 20px;
    line-height: 1.3;
    color: #343a40;
}

.origami-meta-large {
    display: flex;
    justify-content: center;
    gap: 25px;
    color: var(--secondary-color);
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.origami-image-large {
    width: 100%;
    max-height: 450px;
    object-fit: cover;
    margin-bottom: 30px;
    box-shadow: var(--paper-shadow);
    border: 1px solid #dee2e6;
}

.origami-content {
    line-height: 1.8;
    font-size: 17px;
    background-color: var(--paper-white);
    padding: 30px;
    box-shadow: var(--paper-shadow);
    position: relative;
}

.origami-content p {
    margin-bottom: 20px;
}

/* 分页导航折纸效果 */
.origami-pagination {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 40px;
}

.origami-pagination a {
    padding: 10px 20px;
    background-color: var(--paper-white);
    box-shadow: var(--paper-shadow);
    border-radius: 2px;
    transition: all 0.3s;
    transform: skewX(-10deg);
}

.origami-pagination a:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 友情链接折纸效果 */
.origami-links {
    background-color: var(--paper-white);
    padding: 25px;
    margin: 30px 0;
    box-shadow: var(--paper-shadow);
    position: relative;
}

.origami-links h3 {
    margin-bottom: 20px;
    color: #343a40;
    font-size: 20px;
}

.origami-links-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.origami-links-container a {
    padding: 8px 15px;
    background-color: var(--paper-gray);
    border-radius: 2px;
    font-size: 14px;
    box-shadow: var(--paper-shadow);
    transform: skewX(-5deg);
}

.origami-links-container a:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 页脚折纸效果 */
footer {
    background-color: #343a40;
    padding: 30px 0;
    text-align: center;
    margin-top: 50px;
    color: var(--paper-white);
    position: relative;
}

/* 页脚折叠角 */
footer::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    border-width: 0 var(--fold-size) var(--fold-size) 0;
    border-style: solid;
    border-color: #495057 rgba(0,0,0,0.2);
}

.copyright {
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .article-origami-grid {
        grid-template-columns: 1fr;
    }
    
    .origami-title-large {
        font-size: 26px;
    }
}