/* Fat Free Blog - Medium-like Theme */

:root {
    --bg: #ffffff;
    --bg-secondary: #f8f9fa;
    --text: #292929;
    --text-secondary: #6b6b6b;
    --text-tertiary: #999;
    --accent: #1a8917;
    --border: #e6e6e6;
    --code-bg: #f6f8fa;
    --blockquote-border: #292929;
    --max-width: 720px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #121212;
        --bg-secondary: #1e1e1e;
        --text: #e0e0e0;
        --text-secondary: #a0a0a0;
        --text-tertiary: #707070;
        --accent: #4caf50;
        --border: #333;
        --code-bg: #1e1e1e;
        --blockquote-border: #e0e0e0;
    }
}

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

body {
    font-family: 'Georgia', 'Cambria', 'Times New Roman', serif;
    font-size: 19px;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header */
.site-header {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border);
    max-width: 100%;
}

.site-header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-title {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

.site-title a {
    color: inherit;
}

.site-title a:hover {
    text-decoration: none;
    opacity: 0.8;
}

.site-nav {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Main Content */
.main-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 40px 20px 80px;
}

/* Home Page - Post List */
.post-list {
    list-style: none;
}

.post-item {
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

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

.post-item-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

.post-item-link:hover {
    text-decoration: none;
}

.post-item-link:hover .post-item-title {
    opacity: 0.8;
}

.post-meta {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.category-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    color: white;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.series-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 500;
    border: 1px solid var(--border);
}

.post-date {
    color: var(--text-tertiary);
}

.article-badges {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.post-item-title {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.post-item-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Article Page */
.article-header {
    margin-bottom: 40px;
    text-align: center;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.article-part {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.article-title {
    font-size: 36px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.article-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 24px;
}

.article-meta {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: var(--text-tertiary);
}

.article-meta span {
    margin: 0 4px;
}

/* Article Body */
.article-body h2 {
    font-size: 24px;
    font-weight: 700;
    margin-top: 48px;
    margin-bottom: 14px;
    letter-spacing: -0.3px;
}

.article-body h3 {
    font-size: 20px;
    font-weight: 700;
    margin-top: 36px;
    margin-bottom: 10px;
}

.article-body p {
    margin-bottom: 24px;
}

.article-body strong {
    font-weight: 700;
}

.article-body em {
    font-style: italic;
}

/* Lists */
.article-body ul,
.article-body ol {
    margin-bottom: 24px;
    padding-left: 24px;
}

.article-body li {
    margin-bottom: 8px;
    padding-left: 4px;
}

.article-body li::marker {
    color: var(--accent);
}

.list-title {
    font-weight: 700;
    margin-bottom: 8px;
}

/* Code Blocks */
.article-body code {
    font-family: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', monospace;
    font-size: 16px;
    background: var(--code-bg);
    color: var(--text);
    padding: 2px 6px;
    border-radius: 4px;
}

.article-body pre {
    background: var(--code-bg);
    border-radius: 8px;
    padding: 20px 24px;
    margin-bottom: 24px;
    overflow-x: auto;
    border: 1px solid var(--border);
}

.article-body pre code {
    background: none;
    padding: 0;
    font-size: 15px;
    line-height: 1.6;
}

/* Blockquote */
.article-body blockquote {
    border-left: 3px solid var(--blockquote-border);
    padding-left: 20px;
    margin: 32px 0;
    font-style: italic;
    color: var(--text-secondary);
}

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

/* Callout */
.callout {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-left: 4px solid var(--border);
    border-radius: 8px;
    padding: 20px 24px;
    margin: 32px 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.6;
}

.callout-title {
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.callout-title::before {
    content: '';
    display: inline-block;
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* Technical - Under the Hood */
.callout.technical {
    background: #1e293b;
    border-color: #475569;
    border-left-color: #64748b;
    color: #e2e8f0;
}

.callout.technical .callout-title {
    color: #94a3b8;
}

.callout.technical .callout-title::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M10 20l4-16m4 4l4 4-4 4M6 16l-4-4 4-4'/%3E%3C/svg%3E");
    background-size: contain;
}

.callout.technical code {
    background: #334155;
    color: #f8fafc;
}

/* Info - General tip */
.callout.info {
    background: #eff6ff;
    border-color: #bfdbfe;
    border-left-color: #3b82f6;
    color: #1e40af;
}

.callout.info .callout-title {
    color: #2563eb;
}

.callout.info .callout-title::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%232563eb'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z'/%3E%3C/svg%3E");
    background-size: contain;
}

.callout.info code {
    background: #dbeafe;
    color: #1e3a8a;
}

/* Warning - Caution */
.callout.warning {
    background: #fefce8;
    border-color: #fef08a;
    border-left-color: #eab308;
    color: #854d0e;
}

.callout.warning .callout-title {
    color: #ca8a04;
}

.callout.warning .callout-title::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23ca8a04'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z'/%3E%3C/svg%3E");
    background-size: contain;
}

.callout.warning code {
    background: #fef9c3;
    color: #713f12;
}

/* Try It - Interactive */
.callout.try-it {
    background: #f0fdf4;
    border-color: #bbf7d0;
    border-left-color: #22c55e;
    color: #166534;
}

.callout.try-it .callout-title {
    color: #16a34a;
}

.callout.try-it .callout-title::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2316a34a'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M14.752 11.168l-3.197-2.132A1 1 0 0010 9.87v4.263a1 1 0 001.555.832l3.197-2.132a1 1 0 000-1.664z'/%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 12a9 9 0 11-18 0 9 9 0 0118 0z'/%3E%3C/svg%3E");
    background-size: contain;
}

.callout.try-it code {
    background: rgba(0, 0, 0, 0.08);
    color: #166534;
}

/* Dark mode for info and warning */
@media (prefers-color-scheme: dark) {
    .callout.info {
        background: #1e293b;
        border-color: #334155;
        border-left-color: #3b82f6;
        color: #93c5fd;
    }

    .callout.info .callout-title {
        color: #60a5fa;
    }

    .callout.info .callout-title::before {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2360a5fa'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z'/%3E%3C/svg%3E");
        background-size: contain;
    }

    .callout.info code {
        background: #1e3a5f;
        color: #bfdbfe;
    }

    .callout.warning {
        background: #1e293b;
        border-color: #334155;
        border-left-color: #eab308;
        color: #fde047;
    }

    .callout.warning .callout-title {
        color: #facc15;
    }

    .callout.warning .callout-title::before {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23facc15'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-3L13.732 4c-.77-1.333-2.694-1.333-3.464 0L3.34 16c-.77 1.333.192 3 1.732 3z'/%3E%3C/svg%3E");
        background-size: contain;
    }

    .callout.warning code {
        background: #422006;
        color: #fef08a;
    }

    .callout.try-it {
        background: #1e293b;
        border-color: #334155;
        border-left-color: #22c55e;
        color: #86efac;
    }

    .callout.try-it .callout-title {
        color: #4ade80;
    }

    .callout.try-it .callout-title::before {
        background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%234ade80'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M14.752 11.168l-3.197-2.132A1 1 0 0010 9.87v4.263a1 1 0 001.555.832l3.197-2.132a1 1 0 000-1.664z'/%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 12a9 9 0 11-18 0 9 9 0 0118 0z'/%3E%3C/svg%3E");
        background-size: contain;
    }

    .callout.try-it code {
        background: #14532d;
        color: #bbf7d0;
    }
}

/* Table */
.table-wrapper {
    overflow-x: auto;
    margin: 24px 0;
}

.article-body table {
    width: 100%;
    border-collapse: collapse;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
}

.article-body th,
.article-body td {
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

.article-body th {
    font-weight: 600;
    background: var(--bg-secondary);
}

/* Post Navigation */
.post-nav {
    margin-top: 64px;
    padding-top: 32px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
}

.post-nav a {
    color: var(--text-secondary);
}

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

/* Footer */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 24px 20px;
    text-align: center;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: var(--text-tertiary);
}

/* Responsive */
@media (max-width: 768px) {
    body {
        font-size: 17px;
    }

    .article-title {
        font-size: 28px;
    }

    .article-subtitle {
        font-size: 17px;
    }

    .article-body h2 {
        font-size: 22px;
    }

    .article-body h3 {
        font-size: 18px;
    }

    .post-item-title {
        font-size: 20px;
    }

    .article-body pre {
        padding: 16px;
        font-size: 14px;
    }
}