/*
Theme Name: Silro Developer Blog
Theme URI: https://silronomu.com
Author: 박실로 (Park Sil-Ro)
Author URI: https://silronomu.com
Description: AI 최적화 & 인블로그 스타일 개인 블로그 테마. 옵시디언 노트를 블로그로 활용. Schema.org JSON-LD, 시맨틱 HTML, E-E-A-T 최적화.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: silro-developer
Tags: blog, dark-mode, ai-optimized, schema-markup, responsive, seo-ready
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 8.0
*/

/* ============================================
   DESIGN TOKENS & CSS CUSTOM PROPERTIES
   ============================================ */

:root {
    /* ── Typography ── */
    --font-sans: 'Pretendard', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --font-display: 'Outfit', 'Inter', sans-serif;

    /* ── Font Sizes (Fluid) ── */
    --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
    --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
    --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
    --text-lg: clamp(1.1rem, 1rem + 0.5vw, 1.25rem);
    --text-xl: clamp(1.3rem, 1.15rem + 0.75vw, 1.6rem);
    --text-2xl: clamp(1.6rem, 1.3rem + 1.5vw, 2.2rem);
    --text-3xl: clamp(2rem, 1.5rem + 2.5vw, 3rem);
    --text-4xl: clamp(2.5rem, 1.8rem + 3.5vw, 4rem);

    /* ── Spacing ── */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* ── Border Radius ── */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* ── Shadows ── */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);

    /* ── Transitions ── */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;

    /* ── Content Width ── */
    --content-max: 760px;
    --page-max: 1200px;
    --wide-max: 1400px;
}

/* ── Light Mode (Default) ── */
:root,
[data-theme="light"] {
    --bg-primary: #FAFBFC;
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F3F4F6;
    --bg-elevated: #FFFFFF;
    --bg-code: #F8F9FA;
    --bg-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    --text-primary: #1A1D23;
    --text-secondary: #4B5563;
    --text-tertiary: #9CA3AF;
    --text-inverse: #FFFFFF;

    --accent-primary: #6366F1;
    --accent-hover: #4F46E5;
    --accent-light: rgba(99, 102, 241, 0.08);
    --accent-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 50%, #A855F7 100%);

    --border-primary: #E5E7EB;
    --border-secondary: #F3F4F6;
    --border-accent: rgba(99, 102, 241, 0.3);

    --tag-bg: #EEF2FF;
    --tag-text: #4338CA;
    --tag-hover: #E0E7FF;

    --code-bg: #F8F9FA;
    --code-text: #D63384;

    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    --info: #3B82F6;

    color-scheme: light;
}

/* ── Dark Mode ── */
[data-theme="dark"] {
    --bg-primary: #0B0F19;
    --bg-secondary: #111827;
    --bg-tertiary: #1F2937;
    --bg-elevated: #1A2035;
    --bg-code: #151B2B;
    --bg-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);

    --text-primary: #F0F2F5;
    --text-secondary: #9CA3AF;
    --text-tertiary: #6B7280;
    --text-inverse: #0B0F19;

    --accent-primary: #818CF8;
    --accent-hover: #A5B4FC;
    --accent-light: rgba(129, 140, 248, 0.1);
    --accent-gradient: linear-gradient(135deg, #818CF8 0%, #A78BFA 50%, #C084FC 100%);

    --border-primary: #1F2937;
    --border-secondary: #374151;
    --border-accent: rgba(129, 140, 248, 0.3);

    --tag-bg: rgba(129, 140, 248, 0.12);
    --tag-text: #A5B4FC;
    --tag-hover: rgba(129, 140, 248, 0.2);

    --code-bg: #151B2B;
    --code-text: #F472B6;

    --success: #34D399;
    --warning: #FBBF24;
    --error: #F87171;
    --info: #60A5FA;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(129, 140, 248, 0.2);

    color-scheme: dark;
}

/* ============================================
   RESET & BASE
   ============================================ */

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

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

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
    transition: background-color var(--duration-slow) var(--ease-out),
        color var(--duration-slow) var(--ease-out);
}

::selection {
    background-color: var(--accent-primary);
    color: var(--text-inverse);
}

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

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

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

/* ============================================
   ACCESSIBILITY: SKIP LINK
   ============================================ */

.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: 9999;
    padding: var(--space-3) var(--space-6);
    background: var(--accent-primary);
    color: var(--text-inverse);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: top var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
    top: var(--space-4);
    outline: 3px solid var(--accent-hover);
    outline-offset: 2px;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(250, 251, 252, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-primary);
    transition: background var(--duration-slow) var(--ease-out),
        border-color var(--duration-slow) var(--ease-out);
}

[data-theme="dark"] .site-header {
    background: rgba(11, 15, 25, 0.85);
}

.header-inner {
    max-width: var(--wide-max);
    margin: 0 auto;
    padding: var(--space-4) var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.site-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.site-logo {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
}

.site-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.site-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.site-title a {
    color: inherit;
}

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

.site-tagline {
    display: none;
}

/* ── Navigation ── */

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.main-nav a {
    padding: var(--space-2) var(--space-4);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
}

.main-nav a:hover,
.main-nav a.current {
    color: var(--text-primary);
    background: var(--accent-light);
}

.main-nav a.current::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
}

/* ── Header Controls ── */

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.search-toggle,
.theme-toggle {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-fast) var(--ease-out);
    font-size: 1.2rem;
}

.search-toggle:hover,
.theme-toggle:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    transform: scale(1.05);
}

/* ── Mobile Menu ── */

.mobile-menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    border-radius: var(--radius-md);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.mobile-menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: all var(--duration-normal) var(--ease-out);
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero-section {
    background: var(--bg-hero);
    padding: var(--space-24) var(--space-6);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: var(--content-max);
    margin: 0 auto;
}

.hero-avatar {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    border: 3px solid rgba(255, 255, 255, 0.3);
    margin: 0 auto var(--space-6);
    overflow: hidden;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.2);
}

.hero-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 800;
    color: #FFFFFF;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-4);
}

.hero-subtitle {
    font-size: var(--text-lg);
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.6;
    margin-bottom: var(--space-8);
}

.hero-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    color: #FFFFFF;
    font-size: var(--text-xs);
    font-weight: 500;
    transition: all var(--duration-normal) var(--ease-out);
}

.hero-badge:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
    color: #FFFFFF;
}

/* ============================================
   SEARCH OVERLAY
   ============================================ */

.search-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-out);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    width: 90%;
    max-width: 640px;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transform: translateY(-20px) scale(0.96);
    transition: transform var(--duration-normal) var(--ease-out);
}

.search-overlay.active .search-container {
    transform: translateY(0) scale(1);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border-primary);
}

.search-input-wrapper svg {
    width: 20px;
    height: 20px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-lg);
    color: var(--text-primary);
    outline: none;
    font-family: var(--font-sans);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.search-shortcut {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    padding: var(--space-1) var(--space-3);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* ============================================
   MAIN CONTENT LAYOUT
   ============================================ */

.site-main {
    max-width: var(--page-max);
    margin: 0 auto;
    padding: var(--space-12) var(--space-6);
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: var(--space-12);
}

.site-main.full-width {
    grid-template-columns: 1fr;
    max-width: var(--content-max);
}

/* ============================================
   CATEGORY NAVIGATION (인블로그 스타일)
   ============================================ */

.category-nav {
    max-width: var(--page-max);
    margin: 0 auto;
    padding: var(--space-6) var(--space-6) 0;
}

.category-tabs {
    display: flex;
    gap: var(--space-1);
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--border-primary);
}

.category-tabs::-webkit-scrollbar {
    display: none;
}

.category-tab {
    padding: var(--space-3) var(--space-5);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    white-space: nowrap;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
}

.category-tab:hover {
    color: var(--text-primary);
    background: var(--accent-light);
}

.category-tab.active {
    color: var(--accent-primary);
    font-weight: 600;
}

.category-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
}

.category-tab .count {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin-left: var(--space-1);
}

/* ============================================
   BLOG POST CARDS
   ============================================ */

.posts-grid {
    display: grid;
    gap: var(--space-1);
}

.post-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-primary);
    padding: var(--space-8);
    transition: all var(--duration-normal) var(--ease-out);
    position: relative;
}

.post-card:hover {
    border-color: var(--border-accent);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    transform: translateY(-2px);
}

.post-card-link {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-3);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    position: relative;
    z-index: 2;
}

.post-category {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    background: var(--tag-bg);
    color: var(--tag-text);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-date {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.post-reading-time {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.post-meta-separator {
    width: 3px;
    height: 3px;
    background: var(--text-tertiary);
    border-radius: var(--radius-full);
}

.post-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 700;
    line-height: 1.35;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    letter-spacing: -0.02em;
}

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

.post-excerpt {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-5);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    position: relative;
    z-index: 2;
}

.post-tag {
    padding: var(--space-1) var(--space-3);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--text-xs);
    font-weight: 500;
    transition: all var(--duration-fast) var(--ease-out);
}

.post-tag:hover {
    background: var(--tag-bg);
    color: var(--tag-text);
}

/* ── Featured Post ── */

.post-card.featured {
    background: var(--bg-hero);
    border: none;
    color: #FFFFFF;
    overflow: hidden;
}

.post-card.featured .post-title {
    color: #FFFFFF;
    font-size: var(--text-2xl);
}

.post-card.featured:hover .post-title {
    color: rgba(255, 255, 255, 0.9);
}

.post-card.featured .post-excerpt {
    color: rgba(255, 255, 255, 0.8);
}

.post-card.featured .post-category {
    background: rgba(255, 255, 255, 0.2);
    color: #FFFFFF;
}

.post-card.featured .post-meta {
    color: rgba(255, 255, 255, 0.7);
}

.post-card.featured .post-tag {
    background: rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.9);
}

/* ── Post Thumbnail ── */

.post-card.has-thumbnail {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: var(--space-6);
}

.post-thumbnail {
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16/10;
}

.post-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--duration-slow) var(--ease-out);
}

.post-card:hover .post-thumbnail img {
    transform: scale(1.05);
}

/* ============================================
   SINGLE POST (ARTICLE)
   ============================================ */

.article-header {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: var(--space-16) var(--space-6) var(--space-8);
    text-align: center;
}

.article-breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-bottom: var(--space-6);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

.article-breadcrumb a {
    color: var(--text-secondary);
}

.article-breadcrumb a:hover {
    color: var(--accent-primary);
}

.article-breadcrumb svg {
    width: 14px;
    height: 14px;
    color: var(--text-tertiary);
}

.article-title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: var(--space-6);
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.article-author {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.article-author-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.article-author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ── Article Content ── */

.article-content {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 var(--space-6) var(--space-16);
}

.article-content h2 {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin: var(--space-12) 0 var(--space-5);
    line-height: 1.3;
    letter-spacing: -0.02em;
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-primary);
}

.article-content h3 {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--space-8) 0 var(--space-4);
    line-height: 1.35;
}

.article-content h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: var(--space-6) 0 var(--space-3);
}

.article-content p {
    margin-bottom: var(--space-6);
    color: var(--text-secondary);
}

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

.article-content ul,
.article-content ol {
    margin: 0 0 var(--space-6);
    padding-left: var(--space-6);
    color: var(--text-secondary);
}

.article-content li {
    margin-bottom: var(--space-2);
}

.article-content blockquote {
    border-left: 3px solid var(--accent-primary);
    padding: var(--space-4) var(--space-6);
    margin: var(--space-6) 0;
    background: var(--accent-light);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--text-secondary);
}

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

.article-content code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    padding: 0.15em 0.4em;
    background: var(--code-bg);
    color: var(--code-text);
    border-radius: var(--radius-sm);
}

.article-content pre {
    background: var(--bg-code);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    margin: var(--space-6) 0;
    overflow-x: auto;
    line-height: 1.6;
}

.article-content pre code {
    padding: 0;
    background: transparent;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.article-content img {
    border-radius: var(--radius-md);
    margin: var(--space-8) 0;
    box-shadow: var(--shadow-md);
}

.article-content a {
    color: var(--accent-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: rgba(99, 102, 241, 0.3);
    transition: text-decoration-color var(--duration-fast) var(--ease-out);
}

.article-content a:hover {
    text-decoration-color: var(--accent-primary);
}

.article-content hr {
    border: none;
    height: 1px;
    background: var(--border-primary);
    margin: var(--space-12) 0;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-6) 0;
    font-size: var(--text-sm);
}

.article-content th,
.article-content td {
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--border-primary);
    text-align: left;
}

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

/* ── Table of Contents ── */

.toc-sidebar {
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    padding-right: var(--space-4);
}

.toc-title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.toc-list {
    list-style: none;
    padding: 0;
}

.toc-list li {
    margin-bottom: var(--space-1);
}

.toc-list a {
    display: block;
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: all var(--duration-fast) var(--ease-out);
}

.toc-list a:hover,
.toc-list a.active {
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    background: var(--accent-light);
}

.toc-list .toc-h3 {
    padding-left: var(--space-8);
}

/* ============================================
   SIDEBAR
   ============================================ */

.site-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.sidebar-widget {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
}

.widget-title {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ── Author Widget ── */

.author-widget {
    text-align: center;
}

.author-avatar {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-full);
    margin: 0 auto var(--space-4);
    overflow: hidden;
    border: 3px solid var(--border-accent);
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-name {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.author-role {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
}

.author-bio {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.author-links {
    display: flex;
    justify-content: center;
    gap: var(--space-3);
}

.author-link {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    transition: all var(--duration-fast) var(--ease-out);
    font-size: 1.25rem;
}

.author-link:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ── Tags Cloud ── */

.tags-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag-link {
    padding: var(--space-1) var(--space-3);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 500;
    transition: all var(--duration-fast) var(--ease-out);
}

.tag-link:hover {
    background: var(--tag-bg);
    color: var(--tag-text);
    transform: translateY(-1px);
}

/* ── Newsletter Widget ── */

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.newsletter-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    transition: border-color var(--duration-fast) var(--ease-out);
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-light);
}

.newsletter-btn {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: none;
    border-radius: var(--radius-md);
    background: var(--accent-gradient);
    color: #FFFFFF;
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}

.newsletter-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   PAGINATION
   ============================================ */

.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-12);
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-primary);
}

.page-numbers {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--duration-fast) var(--ease-out);
}

.page-numbers:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
}

.page-numbers.current {
    background: var(--accent-primary);
    color: #FFFFFF;
}

/* ============================================
   FOOTER
   ============================================ */

.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: var(--space-16) var(--space-6) var(--space-8);
}

.footer-inner {
    max-width: var(--page-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.footer-brand .site-title {
    font-size: var(--text-xl);
}

.footer-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.7;
}

.footer-heading {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer-links a {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: color var(--duration-fast) var(--ease-out);
}

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

.footer-bottom {
    max-width: var(--page-max);
    margin: var(--space-12) auto 0;
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.footer-social {
    display: flex;
    gap: var(--space-3);
}

.footer-social a {
    color: var(--text-tertiary);
    transition: color var(--duration-fast) var(--ease-out);
    font-size: 1.1rem;
}

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

/* ============================================
   READING PROGRESS BAR
   ============================================ */

.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--accent-gradient);
    z-index: 9999;
    transition: width 30ms linear;
}

/* ============================================
   BACK TO TOP
   ============================================ */

.back-to-top {
    position: fixed;
    bottom: var(--space-8);
    right: var(--space-8);
    width: 44px;
    height: 44px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    color: #FFFFFF;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--duration-normal) var(--ease-out);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* ============================================
   404 / ERROR PAGE
   ============================================ */

.error-page {
    text-align: center;
    padding: var(--space-24) var(--space-6);
    max-width: var(--content-max);
    margin: 0 auto;
}

.error-code {
    font-family: var(--font-display);
    font-size: 8rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: var(--space-4);
}

.error-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.error-description {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.error-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    background: var(--accent-gradient);
    color: #FFFFFF;
    border-radius: var(--radius-full);
    font-weight: 600;
    transition: all var(--duration-normal) var(--ease-out);
}

.error-cta:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: #FFFFFF;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideDown {
    from {
        transform: translateY(-10px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.animate-fade-in {
    animation: fadeIn var(--duration-slow) var(--ease-out) both;
}

.animate-fade-in-up {
    animation: fadeInUp var(--duration-slow) var(--ease-out) both;
}

.animate-slide-down {
    animation: slideDown var(--duration-normal) var(--ease-out) both;
}

/* ── Staggered Animations ── */

.post-card:nth-child(1) {
    animation-delay: 0ms;
}

.post-card:nth-child(2) {
    animation-delay: 80ms;
}

.post-card:nth-child(3) {
    animation-delay: 160ms;
}

.post-card:nth-child(4) {
    animation-delay: 240ms;
}

.post-card:nth-child(5) {
    animation-delay: 320ms;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
    .site-main {
        grid-template-columns: 1fr;
    }

    .site-sidebar {
        display: none;
    }

    .footer-inner {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-8);
    }
}

@media (max-width: 768px) {
    .header-inner {
        padding: var(--space-3) var(--space-4);
    }

    .main-nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-section {
        padding: var(--space-16) var(--space-4);
    }

    .hero-title {
        font-size: var(--text-2xl);
    }

    .post-card.has-thumbnail {
        grid-template-columns: 1fr;
    }

    .post-thumbnail {
        aspect-ratio: 16/9;
    }

    .article-header {
        padding: var(--space-12) var(--space-4) var(--space-6);
    }

    .article-content {
        padding: 0 var(--space-4) var(--space-12);
    }

    .footer-inner {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }

    .category-tabs {
        padding-left: var(--space-2);
        padding-right: var(--space-2);
    }
}

@media (max-width: 480px) {
    :root {
        --space-6: 1rem;
        --space-8: 1.5rem;
        --space-12: 2.5rem;
        --space-16: 3rem;
        --space-24: 4rem;
    }

    .post-card {
        padding: var(--space-5);
    }

    .sidebar-widget {
        padding: var(--space-4);
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {

    .site-header,
    .site-sidebar,
    .site-footer,
    .search-overlay,
    .back-to-top,
    .reading-progress,
    .theme-toggle,
    .search-toggle {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
        font-size: 12pt;
        line-height: 1.5;
    }

    .article-content a::after {
        content: ' (' attr(href) ')';
        font-size: 0.8em;
        color: #666;
    }
}