/* ========================================
   林一的技术笔记 - Hugo Paper 风格主题
   ======================================== */

:root {
    --color-primary: #2d5af0;
    --color-text: #1a1a2e;
    --color-text-secondary: #555770;
    --color-text-tertiary: #8b8fa3;
    --color-bg: #f8f9fa;
    --color-bg-card: #ffffff;
    --color-border: #e8e8ed;
    --color-code-bg: #f1f3f5;
    --color-link: #2d5af0;
    --color-link-hover: #1a3fb5;
    --color-tag-bg: #eef1ff;
    --color-tag-text: #4a6cf7;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --radius: 8px;
    --max-width: 800px;
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
}

/* ========== Layout ========== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.25rem;
}

/* ========== Header ========== */
.site-header {
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: rgba(255,255,255,0.92);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.site-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-title:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.site-nav {
    display: flex;
    gap: 1.5rem;
}

.site-nav a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    position: relative;
    padding: 0.25rem 0;
}

.site-nav a:hover,
.site-nav a.active {
    color: var(--color-primary);
    text-decoration: none;
}

.site-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

/* ========== Main Content ========== */
.main-content {
    padding: 2.5rem 0 4rem;
    min-height: calc(100vh - 60px - 120px);
}

/* ========== Post Card (Homepage) ========== */
.post-card {
    background: var(--color-bg-card);
    border-radius: var(--radius);
    padding: 1.75rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, transform 0.2s;
    border: 1px solid var(--color-border);
}

.post-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.post-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
}

.post-card-title a {
    color: var(--color-text);
}

.post-card-title a:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.post-card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    margin-bottom: 0.75rem;
}

.post-card-summary {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.post-card-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
    flex-wrap: wrap;
}

/* ========== Tags ========== */
.tag {
    display: inline-block;
    background: var(--color-tag-bg);
    color: var(--color-tag-text);
    font-size: 0.78rem;
    padding: 0.15rem 0.6rem;
    border-radius: 20px;
    transition: background 0.2s;
}

.tag:hover {
    background: #dce3ff;
    text-decoration: none;
    color: var(--color-tag-text);
}

/* ========== Article (Single Post) ========== */
.article-header {
    margin-bottom: 2rem;
}

.article-title {
    font-size: 1.85rem;
    font-weight: 700;
    line-height: 1.35;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.88rem;
    color: var(--color-text-tertiary);
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--color-border);
}

.article-content {
    font-size: 1rem;
    line-height: 1.9;
    color: var(--color-text-secondary);
}

.article-content h2 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 2rem 0 1rem;
    padding-top: 0.5rem;
}

.article-content h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--color-text);
    margin: 1.5rem 0 0.75rem;
}

.article-content p {
    margin-bottom: 1.15rem;
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.15rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.35rem;
}

.article-content code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    background: var(--color-code-bg);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.88em;
    color: #c7254e;
}

.article-content pre {
    background: #282c34;
    color: #abb2bf;
    border-radius: var(--radius);
    padding: 1.25rem;
    overflow-x: auto;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.article-content pre code {
    background: none;
    color: inherit;
    padding: 0;
    font-size: 0.88rem;
}

.article-content blockquote {
    border-left: 3px solid var(--color-primary);
    padding: 0.5rem 1rem;
    margin: 1.25rem 0;
    background: var(--color-code-bg);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--color-text-secondary);
}

.article-content blockquote p {
    margin-bottom: 0;
}

.article-content strong {
    color: var(--color-text);
    font-weight: 600;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 2rem 0;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.25rem;
    font-size: 0.92rem;
}

.article-content th,
.article-content td {
    border: 1px solid var(--color-border);
    padding: 0.6rem 0.8rem;
    text-align: left;
}

.article-content th {
    background: var(--color-code-bg);
    font-weight: 600;
}

/* ========== Section Title ========== */
.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--color-border);
}

/* ========== Archive List ========== */
.archive-year {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text-tertiary);
    margin: 1.5rem 0 0.75rem;
}

.archive-item {
    display: flex;
    align-items: baseline;
    gap: 1rem;
    padding: 0.5rem 0;
    border-bottom: 1px dashed var(--color-border);
}

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

.archive-date {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    white-space: nowrap;
    min-width: 80px;
}

.archive-item a {
    color: var(--color-text);
    font-size: 0.95rem;
}

.archive-item a:hover {
    color: var(--color-primary);
}

/* ========== Category / Tag Cloud ========== */
.cloud-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.cloud-item {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: all 0.2s;
}

.cloud-item:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}

.cloud-count {
    font-size: 0.75rem;
    background: var(--color-code-bg);
    padding: 0.1rem 0.4rem;
    border-radius: 10px;
    color: var(--color-text-tertiary);
}

/* ========== Links Page ========== */
.link-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-bottom: 0.75rem;
    transition: box-shadow 0.2s;
}

.link-card:hover {
    box-shadow: var(--shadow-md);
    text-decoration: none;
}

.link-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-code-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.link-info h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.15rem;
}

.link-info p {
    font-size: 0.82rem;
    color: var(--color-text-tertiary);
    margin: 0;
}

/* ========== About Page ========== */
.about-content {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 2rem;
}

.about-content h2 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.about-content p {
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

.about-content ul {
    padding-left: 1.25rem;
    margin-bottom: 1rem;
    color: var(--color-text-secondary);
}

.about-content li {
    margin-bottom: 0.35rem;
}

/* ========== 404 Page ========== */
.not-found {
    text-align: center;
    padding: 4rem 0;
}

.not-found h1 {
    font-size: 6rem;
    font-weight: 800;
    color: var(--color-border);
    line-height: 1;
    margin-bottom: 1rem;
}

.not-found p {
    color: var(--color-text-tertiary);
    margin-bottom: 1.5rem;
}

.not-found a {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: background 0.2s;
}

.not-found a:hover {
    background: var(--color-link-hover);
    text-decoration: none;
    color: #fff;
}

/* ========== Footer ========== */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.82rem;
    color: var(--color-text-tertiary);
    background: var(--color-bg-card);
}

.site-footer p {
    margin-bottom: 0.25rem;
}

.site-footer a {
    color: var(--color-text-tertiary);
}

.site-footer a:hover {
    color: var(--color-primary);
}

/* ========== Responsive ========== */
@media (max-width: 640px) {
    .site-header .container {
        flex-direction: column;
        height: auto;
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }

    .site-nav {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .article-title {
        font-size: 1.4rem;
    }

    .post-card {
        padding: 1.25rem;
    }

    .archive-item {
        flex-direction: column;
        gap: 0.15rem;
    }
}