/* ========================================
   瑞士风格极简主义模板
   Swiss Style Minimalist Template
   ======================================== */

/* ---------- CSS 变量 ---------- */
:root {
    --color-black: #1a1a1a;
    --color-dark-gray: #333333;
    --color-gray: #666666;
    --color-light-gray: #999999;
    --color-silver: #e5e5e5;
    --color-light: #f5f5f5;
    --color-white: #ffffff;
    --color-accent: #dc2626;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    --grid-unit: 8px;
    --max-width: 1200px;
    --sidebar-width: 280px;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-dark-gray);
    background-color: var(--color-white);
}

/* ---------- 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-black);
    margin-bottom: calc(var(--grid-unit) * 2);
}

h1 { font-size: 2rem; letter-spacing: -0.02em; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; text-transform: uppercase; letter-spacing: 0.05em; }

p {
    margin-bottom: calc(var(--grid-unit) * 2);
}

a {
    color: var(--color-dark-gray);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
}

a:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* ---------- 列表 ---------- */
ul, ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

li {
    margin: 0;
    padding: 0;
}

/* ---------- 图片 ---------- */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ---------- 布局容器 ---------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 calc(var(--grid-unit) * 3);
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---------- 顶部区域 ---------- */
.site-header {
    border-bottom: 1px solid var(--color-silver);
    padding: calc(var(--grid-unit) * 4) 0;
}

.site-branding {
    display: flex;
    flex-direction: column;
    gap: calc(var(--grid-unit));
}

.site-title {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    margin: 0;
}

.site-title a {
    color: var(--color-black);
    border-bottom: none;
}

.site-title a:hover {
    color: var(--color-accent);
}

.site-tagline {
    font-size: 0.875rem;
    color: var(--color-gray);
    font-weight: 400;
    margin: 0;
}

/* ---------- 导航 ---------- */
.site-nav {
    margin-top: calc(var(--grid-unit) * 3);
    padding-top: calc(var(--grid-unit) * 3);
    border-top: 1px solid var(--color-silver);
}

.nav-list {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--grid-unit) * 4);
}

.nav-item {
    position: relative;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray);
    border-bottom: 2px solid transparent;
    padding-bottom: 2px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-black);
    border-bottom-color: var(--color-black);
}

/* ---------- 主体布局 ---------- */
.site-main {
    flex: 1;
    padding: calc(var(--grid-unit) * 6) 0;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: calc(var(--grid-unit) * 8);
}

@media (max-width: 900px) {
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: calc(var(--grid-unit) * 6);
    }
}

/* ---------- 文章列表 ---------- */
.post-list {
    display: flex;
    flex-direction: column;
    gap: calc(var(--grid-unit) * 6);
}

.post-item {
    position: relative;
    padding-bottom: calc(var(--grid-unit) * 6);
    border-bottom: 1px solid var(--color-silver);
}

.post-item:last-child {
    border-bottom: none;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: calc(var(--grid-unit) * 2);
    margin-bottom: calc(var(--grid-unit) * 2);
}

.post-date {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-light-gray);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-title {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
    margin: 0 0 calc(var(--grid-unit) * 2) 0;
}

.post-title a {
    color: var(--color-black);
    border-bottom: none;
}

.post-title a:hover {
    color: var(--color-accent);
}

.post-excerpt {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-gray);
    margin-bottom: calc(var(--grid-unit) * 2);
}

.post-stats {
    font-size: 0.75rem;
    color: var(--color-light-gray);
    font-family: var(--font-mono);
}

/* ---------- 分页 ---------- */
.pagination {
    display: flex;
    justify-content: center;
    gap: calc(var(--grid-unit));
    margin-top: calc(var(--grid-unit) * 8);
    padding-top: calc(var(--grid-unit) * 4);
    border-top: 1px solid var(--color-silver);
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: calc(var(--grid-unit) * 5);
    height: calc(var(--grid-unit) * 5);
    padding: 0 calc(var(--grid-unit) * 2);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-gray);
    border: 1px solid var(--color-silver);
    transition: all 0.2s ease;
}

.page-link:hover,
.page-link.active {
    color: var(--color-white);
    background-color: var(--color-black);
    border-color: var(--color-black);
}

/* ---------- 侧边栏 ---------- */
.sidebar {
    position: sticky;
    top: calc(var(--grid-unit) * 4);
    height: fit-content;
}

.widget {
    margin-bottom: calc(var(--grid-unit) * 6);
    padding-bottom: calc(var(--grid-unit) * 6);
    border-bottom: 1px solid var(--color-silver);
}

.widget:last-child {
    border-bottom: none;
}

.widget-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-light-gray);
    margin-bottom: calc(var(--grid-unit) * 3);
    padding-bottom: calc(var(--grid-unit));
    border-bottom: 2px solid var(--color-black);
    display: inline-block;
}

.widget-list {
    display: flex;
    flex-direction: column;
    gap: calc(var(--grid-unit) * 1.5);
}

.widget-list li {
    position: relative;
    padding-left: calc(var(--grid-unit) * 2);
}

.widget-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 4px;
    height: 4px;
    background-color: var(--color-silver);
    transition: background-color 0.2s ease;
}

.widget-list li:hover::before {
    background-color: var(--color-accent);
}

.widget-list a {
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--color-dark-gray);
    border-bottom: none;
}

.widget-list a:hover {
    color: var(--color-accent);
}

/* ---------- 文章详情页 ---------- */
.post-single {
    max-width: 720px;
}

.post-single .post-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: calc(var(--grid-unit) * 3);
}

.post-content {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-dark-gray);
}

.post-content p {
    margin-bottom: calc(var(--grid-unit) * 3);
}

.post-content h2,
.post-content h3,
.post-content h4 {
    margin-top: calc(var(--grid-unit) * 6);
    margin-bottom: calc(var(--grid-unit) * 3);
}

.post-content blockquote {
    margin: calc(var(--grid-unit) * 4) 0;
    padding: calc(var(--grid-unit) * 3) calc(var(--grid-unit) * 4);
    border-left: 3px solid var(--color-black);
    background-color: var(--color-light);
    font-style: italic;
}

.post-content blockquote p:last-child {
    margin-bottom: 0;
}

.post-content code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background-color: var(--color-light);
    padding: 2px 6px;
    border-radius: 3px;
}

.post-content pre {
    background-color: var(--color-light);
    padding: calc(var(--grid-unit) * 3);
    overflow-x: auto;
    margin-bottom: calc(var(--grid-unit) * 3);
}

.post-content pre code {
    background: none;
    padding: 0;
}

.post-content ul,
.post-content ol {
    margin-bottom: calc(var(--grid-unit) * 3);
    padding-left: calc(var(--grid-unit) * 3);
}

.post-content ul {
    list-style: disc;
}

.post-content ol {
    list-style: decimal;
}

.post-content img {
    margin: calc(var(--grid-unit) * 4) 0;
    border-radius: 4px;
}

.post-content a {
    color: var(--color-accent);
    border-bottom: 1px solid currentColor;
}

.post-content a:hover {
    border-bottom-color: transparent;
}

.post-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: calc(var(--grid-unit) * 3);
    font-size: 0.9375rem;
}

.post-content th,
.post-content td {
    padding: calc(var(--grid-unit) * 1.5);
    text-align: left;
    border-bottom: 1px solid var(--color-silver);
}

.post-content th {
    font-weight: 600;
    color: var(--color-black);
    border-bottom: 2px solid var(--color-black);
}

/* ---------- 评论区 ---------- */
.comments-section {
    margin-top: calc(var(--grid-unit) * 8);
    padding-top: calc(var(--grid-unit) * 6);
    border-top: 1px solid var(--color-silver);
}

.comments-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: calc(var(--grid-unit) * 4);
}

.comment-form {
    margin-bottom: calc(var(--grid-unit) * 6);
}

.form-group {
    margin-bottom: calc(var(--grid-unit) * 3);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: calc(var(--grid-unit));
    color: var(--color-gray);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: calc(var(--grid-unit) * 1.5);
    font-family: inherit;
    font-size: 1rem;
    border: 1px solid var(--color-silver);
    background-color: var(--color-white);
    transition: border-color 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-black);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--grid-unit) * 1.5) calc(var(--grid-unit) * 4);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-white);
    background-color: var(--color-black);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn:hover {
    background-color: var(--color-accent);
}

/* ---------- 底部 ---------- */
.site-footer {
    border-top: 1px solid var(--color-silver);
    padding: calc(var(--grid-unit) * 4) 0;
    margin-top: auto;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: calc(var(--grid-unit) * 2);
}

.copyright {
    font-size: 0.875rem;
    color: var(--color-gray);
}

.footer-links {
    display: flex;
    gap: calc(var(--grid-unit) * 3);
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-gray);
    border-bottom: none;
}

.footer-links a:hover {
    color: var(--color-accent);
}

/* ---------- 工具类 ---------- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.divider {
    height: 1px;
    background-color: var(--color-silver);
    margin: calc(var(--grid-unit) * 4) 0;
}

/* ---------- 友情链接 ---------- */
.friend-links {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--grid-unit)) calc(var(--grid-unit) * 3);
}

.friend-links a {
    font-size: 0.875rem;
    color: var(--color-gray);
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    :root {
        --grid-unit: 6px;
    }
    
    .nav-list {
        gap: calc(var(--grid-unit) * 3);
    }
    
    .post-title {
        font-size: 1.25rem;
    }
    
    .post-single .post-title {
        font-size: 1.5rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}