/* ========================================
   码上即行 - 主样式表
   CopyRun Main Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-code: #1a1a1a;
    --bg-nav: rgba(10, 10, 10, 0.9);
    --text-primary: #e0e0e0;
    --text-secondary: #888888;
    --text-muted: #666666;
    --accent: #00d4aa;
    --accent-dim: rgba(0, 212, 170, 0.1);
    --accent-glow: rgba(0, 212, 170, 0.2);
    --border: #2a2a2a;
    --border-hover: #3a3a3a;
    --error: #ff5f5f;
    --warning: #ffc107;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --bg-code: #f0f0f0;
    --bg-nav: rgba(255, 255, 255, 0.9);
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-muted: #999999;
    --accent: #00a080;
    --accent-dim: rgba(0, 160, 128, 0.1);
    --accent-glow: rgba(0, 160, 128, 0.15);
    --border: #e0e0e0;
    --border-hover: #d0d0d0;
    --error: #ff5f5f;
    --warning: #ffc107;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
}

/* ========================================
   Animations
   ======================================== */

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px var(--accent-glow); }
    50% { box-shadow: 0 0 40px var(--accent-glow), 0 0 60px rgba(0, 212, 170, 0.1); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ========================================
   Navigation
   ======================================== */

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-nav);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 0 2rem;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--accent);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: '>';
    color: var(--text-secondary);
}

.logo::after {
    content: '_';
    animation: blink 1s infinite;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-family: 'JetBrains Mono', monospace;
    transition: color 0.2s;
    position: relative;
}

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

.nav-links a::before {
    content: '#';
    margin-right: 0.25rem;
    opacity: 0;
    transition: opacity 0.2s;
}

.nav-links a:hover::before {
    opacity: 1;
    color: var(--accent);
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: all 0.2s;
    font-family: 'JetBrains Mono', monospace;
}

.theme-toggle:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.theme-toggle .icon {
    font-size: 1rem;
}

/* ========================================
   Main Layout
   ======================================== */

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 2rem 4rem;
    min-height: calc(100vh - 200px);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    min-height: 70vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 4rem 0;
    position: relative;
    animation: fadeIn 0.8s ease-out;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.03) 0%, transparent 70%);
    pointer-events: none;
}

.hero-badge {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent);
    padding: 0.5rem 1rem;
    background: var(--accent-dim);
    border: 1px solid rgba(0, 212, 170, 0.3);
    border-radius: 100px;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero h1 .gradient {
    background: linear-gradient(135deg, #ffffff 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.skills-hero {
    padding: 4rem 0 3rem;
    text-align: left;
    max-width: 1200px;
    margin: 0 auto;
}

.skills-hero h1 {
    margin-bottom: 1.5rem;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2rem;
}

.hero > p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 3rem;
}

/* Command Line Search */
.search-container {
    width: 100%;
    max-width: 600px;
    margin-bottom: 3rem;
}

.command-line {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.command-line:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim), 0 0 30px var(--accent-glow);
}

.prompt {
    color: var(--accent);
    font-weight: 600;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: inherit;
    outline: none;
}

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

.cursor {
    display: inline-block;
    width: 8px;
    height: 1.2em;
    background: var(--accent);
    animation: blink 1s step-end infinite;
    flex-shrink: 0;
}

/* Hero Stats (for skills/category pages) */
.hero-stats {
    display: flex;
    gap: 3rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-value {
    color: var(--accent);
    font-size: 1.5rem;
    font-weight: 600;
}

.stat-label {
    color: var(--text-secondary);
}

/* ========================================
   Features Section
   ======================================== */

.features {
    padding: 4rem 0;
    border-bottom: 1px solid var(--border);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(0, 212, 170, 0.1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--accent-dim);
    border: 1px solid rgba(0, 212, 170, 0.2);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin: 0 auto 1.25rem;
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   Categories Section
   ======================================== */

.categories {
    padding: 5rem 0;
    border-bottom: 1px solid var(--border);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2.5rem;
}

.section-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-title::before {
    content: '//';
    color: var(--text-muted);
}

.view-all {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-family: 'JetBrains Mono', monospace;
    transition: color 0.2s;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.view-all:hover {
    color: var(--accent);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}

.category-card {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #00ff88);
    opacity: 0;
    transition: opacity 0.3s;
}

.category-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(0, 212, 170, 0.08), transparent 40%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.category-card:hover::before,
.category-card:hover::after {
    opacity: 1;
}

.category-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
}

.category-corner {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--text-muted);
    opacity: 0.5;
}

.category-icon {
    width: 52px;
    height: 52px;
    background: var(--accent-dim);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
    transition: transform 0.3s ease;
}

.category-card:hover .category-icon {
    transform: scale(1.1) rotate(5deg);
}

.category-name {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.category-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.category-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--accent);
}

.category-arrow {
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.category-card:hover .category-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ========================================
   Featured Section
   ======================================== */

.featured {
    padding: 5rem 0;
    border-bottom: 1px solid var(--border);
}

.featured-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 2rem;
}

.featured-main {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 2.5rem;
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 380px;
}

.featured-main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), #00ff88, var(--accent));
    background-size: 200% 100%;
    animation: shimmer 3s linear infinite;
}

.featured-main:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}

.featured-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.4rem 0.875rem;
    background: var(--accent-dim);
    border: 1px solid rgba(0, 212, 170, 0.3);
    border-radius: 100px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent);
    font-weight: 600;
    width: fit-content;
    margin-bottom: 1.5rem;
}

.featured-main h3 {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
}

.featured-main p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.featured-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.featured-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.featured-item:hover {
    border-color: var(--accent);
    transform: translateX(8px);
}

.featured-item-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.tag-pill {
    padding: 0.2rem 0.6rem;
    background: var(--bg-tertiary);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--accent);
}

.featured-item h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.featured-item-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

/* ========================================
   Timeline Section
   ======================================== */

.timeline {
    padding: 5rem 0;
    border-bottom: 1px solid var(--border);
}

.timeline-container {
    position: relative;
}

.timeline-line {
    position: absolute;
    left: 100px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border);
}

.timeline-line::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent, var(--accent), transparent);
    opacity: 0.3;
}

.timeline-items {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    position: relative;
}

.timeline-date {
    width: 80px;
    text-align: right;
    flex-shrink: 0;
}

.timeline-date-day {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
}

.timeline-date-month {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.timeline-dot {
    position: absolute;
    left: 94px;
    top: 0.5rem;
    width: 13px;
    height: 13px;
    background: var(--bg-primary);
    border: 2px solid var(--accent);
    border-radius: 50%;
    z-index: 1;
}

.timeline-content {
    flex: 1;
    margin-left: 60px;
}

.timeline-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: all 0.3s ease;
}

.timeline-card:hover {
    border-color: var(--accent);
    transform: translateX(8px);
}

.timeline-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.timeline-tag {
    padding: 0.15rem 0.5rem;
    background: var(--accent-dim);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.7rem;
    color: var(--accent);
}

.timeline-title {
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.4;
}

/* ========================================
   Newsletter Section
   ======================================== */

.newsletter {
    padding: 5rem 0;
    text-align: center;
}

.newsletter-content {
    max-width: 500px;
    margin: 0 auto;
}

.newsletter h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.newsletter p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.newsletter-form {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}

.newsletter-input {
    flex: 1;
    max-width: 300px;
    padding: 0.875rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
    transition: all 0.3s;
}

.newsletter-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.newsletter-btn {
    padding: 0.875rem 1.5rem;
    background: var(--accent);
    border: none;
    border-radius: 10px;
    color: var(--bg-primary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
}

.newsletter-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 170, 0.3);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.social-link {
    width: 44px;
    height: 44px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s;
}

.social-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-3px);
}

/* ========================================
   Article Page Styles
   ======================================== */

.article-page {
    animation: fadeIn 0.6s ease-out;
}

/* Article page specific main container */
.article-page main {
    max-width: 800px;
    margin: 0 auto;
    padding: 100px 2rem 4rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    margin-bottom: 2rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--accent);
}

.article-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.article-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.article-tag {
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid var(--accent);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    text-decoration: none;
    display: inline-block;
    transition: all 0.2s;
    cursor: pointer;
}

.article-tag:hover {
    background: var(--accent);
    color: var(--bg-primary);
}

.article-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1rem;
}

.article-meta {
    display: flex;
    gap: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

/* Table of Contents */
.toc {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.toc-title {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

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

.toc-list li {
    margin: 0.5rem 0;
}

.toc-list a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.toc-h2 {
    font-weight: 500;
}

.toc-h3 {
    padding-left: 1.5rem;
    font-size: 0.85rem;
}

/* Article Content */
.article-content {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.35rem;
    font-weight: 600;
    margin: 2.5rem 0 1rem;
    color: var(--text-primary);
}

.article-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 2rem 0 0.75rem;
    color: var(--text-primary);
}

.article-content p {
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.25rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.article-content code {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-tertiary);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent);
    border: 1px solid var(--border);
}

.article-content pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1rem 0;
}

.article-content pre code {
    background: none;
    border: none;
    padding: 0;
    color: var(--text-primary);
}

/* Step Box */
.step-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    position: relative;
}

.step-number {
    position: absolute;
    top: -12px;
    left: 1.5rem;
    background: var(--accent);
    color: var(--bg-primary);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 0.8rem;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.step-box h3 {
    margin-top: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Code Preview */
.code-preview {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    margin: 1rem 0;
}

.code-header {
    background: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.code-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.code-dot.red { background: var(--error); }
.code-dot.yellow { background: var(--warning); }
.code-dot.green { background: var(--accent); }

.code-filename {
    margin-left: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.code-body {
    padding: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.8;
    overflow-x: auto;
}

/* Code Highlighting */
.code-comment { color: #6a9955; }
.code-keyword { color: #569cd6; }
.code-string { color: #ce9178; }
.code-function { color: #dcdcaa; }
.code-variable { color: #9cdcfe; }
.code-number { color: #b5cea8; }
.code-class { color: #4ec9b0; }

/* Copy Button */
.copy-btn {
    margin-left: auto;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Info & Warning Boxes */
.info-box {
    background: var(--bg-secondary);
    border-left: 3px solid var(--accent);
    padding: 1rem 1.25rem;
    border-radius: 0 6px 6px 0;
    margin: 1.5rem 0;
}

.info-box p {
    margin: 0;
    font-size: 0.95rem;
}

.warning-box {
    background: var(--bg-secondary);
    border-left: 3px solid var(--warning);
    padding: 1rem 1.25rem;
    border-radius: 0 6px 6px 0;
    margin: 1.5rem 0;
}

.warning-box p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* ========================================
   Category/Skills Page Styles
   ======================================== */

.category-page {
    animation: fadeIn 0.6s ease-out;
}

.category-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.category-header .category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.category-header h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.category-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Section Cards (Skills page) */
.sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.section-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.75rem;
    transition: all 0.2s;
    animation: fadeInUp 0.6s ease-out backwards;
}

.section-card:nth-child(1) { animation-delay: 0.1s; }
.section-card:nth-child(2) { animation-delay: 0.2s; }
.section-card:nth-child(3) { animation-delay: 0.3s; }
.section-card:nth-child(4) { animation-delay: 0.4s; }

.section-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.section-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.section-icon {
    width: 40px;
    height: 40px;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.section-card-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.section-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.tag {
    background: var(--bg-code);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    border: 1px solid var(--border);
}

.tag.primary {
    background: var(--accent-dim);
    color: var(--accent);
    border-color: var(--accent);
}

/* Content List */
.content-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.content-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    transition: all 0.2s;
    text-decoration: none;
    color: inherit;
}

.content-item:hover {
    border-color: var(--accent);
    background: var(--bg-tertiary);
}

.content-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.content-type {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent);
    background: var(--accent-dim);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    white-space: nowrap;
}

.content-title-text {
    font-weight: 500;
}

.content-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.content-arrow {
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.content-item:hover .content-arrow {
    color: var(--accent);
    transform: translateX(4px);
}

/* Section Heading */
.section-heading {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-heading::before {
    content: '//';
    color: var(--accent);
}

/* Hero Tag */
.hero-tag {
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
    font-size: 0.85rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-tag::before {
    content: '[';
    color: var(--text-secondary);
}

.hero-tag::after {
    content: ']';
    color: var(--text-secondary);
}

/* ========================================
   Article List (Category Page)
   ======================================== */

.article-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.article-list-item {
    display: block;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    transition: all 0.2s;
    color: inherit;
}

.article-list-item:hover {
    border-color: var(--accent);
    transform: translateX(4px);
}

.article-list-item h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin: 0 0 0.75rem 0;
    line-height: 1.4;
}

.article-list-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0 0 0.75rem 0;
    line-height: 1.6;
}

.article-list-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

/* ========================================
   Buttons
   ======================================== */

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    font-family: 'JetBrains Mono', monospace;
    background: var(--accent);
    color: var(--bg-primary);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 170, 0.3);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    cursor: pointer;
}

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

/* ========================================
   Footer
   ======================================== */

footer {
    border-top: 1px solid var(--border);
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
}

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

footer a:hover {
    text-decoration: underline;
}

/* ========================================
   Search Results Styles
   ======================================== */

.articles-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 0.5rem 0 2rem;
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.article-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    display: block;
}

.article-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 170, 0.1);
}

.article-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.article-category {
    background: var(--accent-dim);
    color: var(--accent);
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
}

.article-date {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.article-card .article-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.article-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card .article-meta {
    display: flex;
    gap: 1.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.empty-state {
    max-width: 800px;
    margin: 0 auto;
}

/* ========================================
   Responsive Styles
   ======================================== */

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .featured-grid {
        grid-template-columns: 1fr;
    }
    .timeline-line {
        left: 60px;
    }
    .timeline-dot {
        left: 54px;
    }
    .timeline-content {
        margin-left: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    main {
        padding: 80px 1rem 2rem;
    }
    
    .hero {
        min-height: auto;
        padding: 2rem 0;
    }
    
    .hero h1 {
        font-size: clamp(2rem, 8vw, 3rem);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 1.5rem;
        justify-content: center;
    }
    
    .sections {
        grid-template-columns: 1fr;
    }
    
    .content-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .article-list-item {
        padding: 1rem;
    }
    
    .timeline-date {
        display: none;
    }
    .timeline-line {
        left: 10px;
    }
    .timeline-dot {
        left: 4px;
    }
    .timeline-content {
        margin-left: 30px;
    }
    
    .newsletter-form {
        flex-direction: column;
        align-items: center;
    }
    
    .newsletter-input {
        max-width: 100%;
        width: 100%;
    }
}

@media (max-width: 640px) {
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .article-header {
        margin-bottom: 2rem;
        padding-bottom: 1.5rem;
    }
    
    .article-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
}
/* ========================================
   Article Sidebar Layout
   ======================================== */

/* Article Layout with Sidebar */
.article-layout {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    padding: 100px 2rem 4rem;
    gap: 2rem;
    align-items: flex-start;
}

/* Left Sidebar */
.article-sidebar {
    width: 260px;
    flex-shrink: 0;
    position: relative;
}

.toc-sticky {
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    padding-right: 0.5rem;
}

/* Sidebar TOC Title */
.article-sidebar .toc-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

/* Sidebar TOC List */
.article-sidebar .toc-list-wrapper ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.article-sidebar .toc-list-wrapper ul ul {
    margin-left: 0.75rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--border);
}

.article-sidebar .toc-list-wrapper li {
    margin: 0.25rem 0;
}

.article-sidebar .toc-list-wrapper a {
    display: block;
    padding: 0.4rem 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    line-height: 1.4;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.article-sidebar .toc-list-wrapper a:hover {
    color: var(--accent);
    background: var(--accent-dim);
}

/* Main Article Area */
.article-main {
    flex: 1;
    min-width: 0;
    max-width: 800px;
}

/* Full width when no sidebar */
.article-main.article-full {
    max-width: 900px;
    margin: 0 auto;
}

/* Back Link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: var(--accent);
}

/* Article Header */
.article-header {
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

/* Article Footer Tags */
.article-footer-tags {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
}

.article-footer-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
}

.article-footer-tags .article-tags {
    margin-bottom: 0;
}

.article-tag {
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    font-family: 'JetBrains Mono', monospace;
    background: var(--accent-dim);
    color: var(--accent);
    border: 1px solid var(--accent);
}

.article-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Article Content */
.article-content {
    color: var(--text-primary);
    line-height: 1.8;
}

.article-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 2.5rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.article-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 2rem 0 0.75rem;
    color: var(--text-primary);
}

.article-content h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-primary);
}

.article-content p {
    margin-bottom: 1rem;
}

.article-content ul,
.article-content ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.article-content li {
    margin: 0.5rem 0;
}

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

.article-content a:hover {
    text-decoration: underline;
}

.article-content code {
    font-family: 'JetBrains Mono', monospace;
    background: var(--bg-code);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent);
}

.article-content pre {
    background: var(--bg-code);
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    margin: 1rem 0;
}

.article-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

/* Step Box */
.step-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.step-number {
    display: inline-block;
    background: var(--accent);
    color: var(--bg-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    margin-bottom: 0.75rem;
}

/* Info & Warning Boxes */
.info-box {
    background: var(--accent-dim);
    border-left: 3px solid var(--accent);
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

.warning-box {
    background: rgba(255, 193, 7, 0.1);
    border-left: 3px solid var(--warning);
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
    border-radius: 0 8px 8px 0;
}

/* Responsive: Hide sidebar on smaller screens */
@media (max-width: 1024px) {
    .article-layout {
        flex-direction: column;
        padding: 100px 1.5rem 4rem;
    }
    
    .article-sidebar {
        width: 100%;
        order: -1;
    }
    
    .toc-sticky {
        position: relative;
        top: 0;
        max-height: none;
        padding: 1rem;
        background: var(--bg-secondary);
        border-radius: 8px;
        border: 1px solid var(--border);
    }
    
    .article-main {
        max-width: 100%;
    }
}

@media (max-width: 640px) {
    .article-layout {
        padding: 80px 1rem 2rem;
    }
    
    .article-title {
        font-size: 1.5rem;
    }
    
    .article-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .article-sidebar {
        display: none; /* Hide TOC on mobile */
    }
}
/* ========================================
   Category Page - Article Cards Grid
   ======================================== */

.category-page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 2rem 4rem;
}

/* Category Header */
.category-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.category-icon-large {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.category-header p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   Article Cards - Enhanced Design
   ======================================== */

.article-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

/* Article Card - Enhanced */
.article-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1.75rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.article-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #00ff88);
    opacity: 0;
    transition: opacity 0.3s;
}

.article-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(0, 212, 170, 0.08), transparent 40%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.article-card:hover::before,
.article-card:hover::after {
    opacity: 1;
}

.article-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
}

/* Card Header */
.article-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.article-card-tag {
    padding: 0.25rem 0.75rem;
    background: var(--accent-dim);
    color: var(--accent);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.article-card-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

/* Card Title */
.article-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
    transition: color 0.2s ease;
}

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

/* Card Summary */
.article-card-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Card Footer */
.article-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    font-family: 'JetBrains Mono', monospace;
}

.article-card-stats {
    display: flex;
    gap: 1.25rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.article-card-arrow {
    color: var(--accent);
    font-size: 1.25rem;
    opacity: 0;
    transform: translateX(-10px);
    transition: all 0.3s ease;
}

.article-card:hover .article-card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-hint {
    font-size: 0.9rem;
    margin-top: 0.5rem;
    color: var(--text-muted);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    margin: 2rem 0;
}

.pagination-btn {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    transition: all 0.2s ease;
}

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

.pagination-num {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
}

.pagination-current {
    padding: 0.5rem 1rem;
    background: var(--accent);
    color: var(--bg-primary);
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
}

/* Back Home */
.back-home {
    text-align: center;
    margin-top: 2rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.back-link:hover {
    color: var(--accent);
}

/* Responsive */
@media (max-width: 768px) {
    .category-page {
        padding: 80px 1rem 2rem;
    }
    
    .category-header {
        padding: 1.5rem;
    }
    
    .category-header h1 {
        font-size: 1.5rem;
    }
    
    .article-cards-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .article-card {
        padding: 1.25rem;
    }
}
/* ========================================
   Series Page V2 - Optimized Layout
   ======================================== */

.series-page {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 2rem 4rem;
}

/* Series Header */
.series-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
}

.series-icon-large {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.series-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.series-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Series Grid - 每行三个 */
.series-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}

/* Series Card V2 */
.series-card-v2 {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.series-card-v2::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), #00ff88);
    opacity: 0;
    transition: opacity 0.3s;
}

.series-card-v2:hover::before {
    opacity: 1;
}

.series-card-v2:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

/* Recommended Card */
.series-card-recommended {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(0, 212, 170, 0.05) 100%);
}

.series-card-recommended::before {
    opacity: 1;
}

/* Badge */
.series-badge-v2 {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.25rem 0.6rem;
    background: var(--accent);
    color: var(--bg-primary);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 20px;
    font-family: 'JetBrains Mono', monospace;
}

/* Icon */
.series-card-icon-v2 {
    width: 56px;
    height: 56px;
    background: var(--accent-dim);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 1rem;
    transition: transform 0.3s ease;
}

.series-card-v2:hover .series-card-icon-v2 {
    transform: scale(1.1) rotate(5deg);
}

/* Title */
.series-card-title-v2 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    transition: color 0.2s ease;
}

.series-card-v2:hover .series-card-title-v2 {
    color: var(--accent);
}

/* Description */
.series-card-desc-v2 {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: 1rem;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Footer */
.series-card-footer-v2 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
}

.series-card-count {
    color: var(--text-muted);
}

.series-card-difficulty {
    padding: 0.2rem 0.6rem;
    background: var(--accent-dim);
    color: var(--accent);
    border-radius: 20px;
    font-size: 0.75rem;
}

/* ========================================
   Latest Articles Section
   ======================================== */

.latest-articles-section {
    margin-bottom: 3rem;
}

.section-header-v2 {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.section-title-v2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.view-all-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
    font-family: 'JetBrains Mono', monospace;
    transition: color 0.2s;
}

.view-all-link:hover {
    color: #00ff88;
}

/* Latest Articles Grid */
.latest-articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

/* Latest Article Card */
.latest-article-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

.latest-article-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.latest-article-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.latest-article-tag {
    padding: 0.2rem 0.6rem;
    background: var(--accent-dim);
    color: var(--accent);
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
}

.latest-article-date {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.latest-article-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.4;
    transition: color 0.2s;
}

.latest-article-card:hover .latest-article-title {
    color: var(--accent);
}

.latest-article-summary {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
    margin-bottom: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.latest-article-meta {
    display: flex;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Back Home */
.back-home {
    text-align: center;
    margin-top: 2rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .series-grid,
    .latest-articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .series-page {
        padding: 80px 1rem 2rem;
    }
    
    .series-header {
        padding: 1.5rem;
    }
    
    .series-header h1 {
        font-size: 1.75rem;
    }
    
    .series-grid,
    .latest-articles-grid {
        grid-template-columns: 1fr;
    }
    
    .series-card-v2 {
        padding: 1.25rem;
    }
}