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

:root {
    --primary: #ffffff;
    --primary-light: #e0e0e0;
    --primary-dark: #b0b0b0;
    --surface: rgba(255,255,255,0.06);
    --surface-solid: #1a1a1a;
    --background: #0a0a0a;
    --bg-gradient: linear-gradient(135deg, #0a0a0a 0%, #141414 50%, #0d0d0d 100%);
    --on-surface: #ffffff;
    --on-surface-variant: #888888;
    --glass: rgba(255,255,255,0.05);
    --glass-border: rgba(255,255,255,0.1);
    --glow: 0 0 40px rgba(255,255,255,0.05);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --primary: #000000;
    --primary-light: #333333;
    --primary-dark: #1a1a1a;
    --surface: rgba(0,0,0,0.03);
    --surface-solid: #ffffff;
    --background: #f5f5f5;
    --bg-gradient: linear-gradient(135deg, #f5f5f5 0%, #ffffff 50%, #f0f0f0 100%);
    --on-surface: #0a0a0a;
    --on-surface-variant: #666666;
    --glass: rgba(255,255,255,0.7);
    --glass-border: rgba(0,0,0,0.08);
    --glow: 0 4px 30px rgba(0,0,0,0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--background);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--on-surface);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.02) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255,255,255,0.02) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ========== App Bar ========== */
.app-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 64px;
    background: var(--glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    z-index: 100;
    transition: var(--transition);
}

.app-bar-inner {
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.app-bar-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--on-surface);
    margin-left: 16px;
    flex: 1;
    letter-spacing: -0.5px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--on-surface-variant);
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--glass);
    color: var(--on-surface);
}

.app-bar-actions {
    display: flex;
    gap: 4px;
}

/* ========== Side Navigation ========== */
.side-nav {
    position: fixed;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100vh;
    background: var(--surface-solid);
    border-right: 1px solid var(--glass-border);
    z-index: 200;
    transition: left var(--transition);
    overflow-y: auto;
}

.side-nav.open {
    left: 0;
}

.side-nav-header {
    padding: 40px 24px 24px;
    background: var(--on-surface);
    color: var(--background);
    position: relative;
}

.avatar {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: rgba(255,255,255,0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    border: 2px solid rgba(255,255,255,0.2);
}

.side-nav-header h2 {
    font-size: 20px;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.side-nav-header p {
    font-size: 13px;
    opacity: 0.7;
    margin-top: 4px;
    position: relative;
    z-index: 1;
}

.side-nav-list {
    list-style: none;
    padding: 12px 8px;
}

.side-nav-list a {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--on-surface);
    text-decoration: none;
    border-radius: 10px;
    transition: var(--transition);
    gap: 12px;
    font-weight: 500;
    font-size: 14px;
    margin-bottom: 2px;
}

.side-nav-list a:hover {
    background: var(--glass);
}

.side-nav-list a.active {
    background: var(--on-surface);
    color: var(--background);
}

.side-nav-list .material-icons {
    font-size: 20px;
}

/* ========== Overlay ========== */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.overlay.visible {
    opacity: 1;
    visibility: visible;
}

/* ========== Hero Section ========== */
.hero {
    margin-top: 64px;
    padding: 120px 24px 80px;
    text-align: center;
    position: relative;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: var(--on-surface-variant);
    margin-bottom: 32px;
    animation: fadeInUp 0.6s ease-out;
}

.hero-badge .material-icons {
    font-size: 16px;
}

.hero h2 {
    font-size: clamp(48px, 10vw, 80px);
    font-weight: 800;
    line-height: 1;
    margin-bottom: 24px;
    letter-spacing: -3px;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero p {
    font-size: 18px;
    color: var(--on-surface-variant);
    max-width: 450px;
    margin: 0 auto 40px;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--on-surface);
    color: var(--background);
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255,255,255,0.1);
}

[data-theme="light"] .btn-primary:hover {
    box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    color: var(--on-surface);
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

[data-theme="light"] .btn-secondary:hover {
    background: rgba(0,0,0,0.05);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== Section ========== */
.section {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 24px 60px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--on-surface);
}

.section-title .material-icons {
    font-size: 22px;
}

.section-link {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--on-surface-variant);
    text-decoration: none;
    font-weight: 500;
    font-size: 13px;
    transition: var(--transition);
}

.section-link:hover {
    color: var(--on-surface);
    gap: 8px;
}

/* ========== Article Cards ========== */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.article-card {
    background: var(--surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--glow);
    border-color: rgba(255,255,255,0.15);
}

[data-theme="light"] .article-card:hover {
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    border-color: rgba(0,0,0,0.12);
}

.card-image {
    height: 200px;
    position: relative;
    overflow: hidden;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.article-card:hover .card-image img {
    transform: scale(1.05);
}

.card-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to top, rgba(0,0,0,0.5), transparent);
}

.card-category {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 5px 12px;
    background: var(--on-surface);
    color: var(--background);
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 1;
}

.card-content {
    padding: 20px;
}

.card-content h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--on-surface);
    margin-bottom: 8px;
    line-height: 1.3;
    transition: var(--transition);
}

.card-content p {
    font-size: 13px;
    color: var(--on-surface-variant);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 12px;
    color: var(--on-surface-variant);
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.card-meta .material-icons {
    font-size: 14px;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-top: 1px solid var(--glass-border);
}

.card-author {
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-author-avatar {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--on-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--background);
    font-size: 12px;
    font-weight: 700;
}

.card-author-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--on-surface);
}

.card-read-more {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--on-surface-variant);
    font-size: 12px;
    font-weight: 600;
    transition: var(--transition);
}

.article-card:hover .card-read-more {
    color: var(--on-surface);
    gap: 8px;
}

/* ========== Featured Card ========== */
.featured-card {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 360px;
}

.featured-card .card-image {
    height: 100%;
}

.featured-card .card-content {
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-card .card-content h4 {
    font-size: 24px;
    margin-bottom: 12px;
}

.featured-card .card-content p {
    font-size: 14px;
    -webkit-line-clamp: 3;
}

/* ========== Categories ========== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}

.category-card {
    background: var(--surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 24px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
}

.category-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

.category-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 12px;
    background: var(--glass);
    color: var(--on-surface);
    transition: var(--transition);
}

.category-card:hover .category-icon {
    background: var(--on-surface);
    color: var(--background);
}

.category-name {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 4px;
}

.category-count {
    font-size: 12px;
    color: var(--on-surface-variant);
}

/* ========== About Section ========== */
.about-section {
    max-width: 700px;
    margin: 0 auto;
    padding: 40px 24px 100px;
}

.about-card {
    background: var(--surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 40px;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 32px;
    align-items: center;
}

.about-avatar {
    width: 100px;
    height: 100px;
    border-radius: 24px;
    background: var(--on-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    font-weight: 800;
    color: var(--background);
}

.about-info h3 {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 12px;
}

.about-info p {
    color: var(--on-surface-variant);
    margin-bottom: 20px;
    line-height: 1.7;
    font-size: 14px;
}

.social-links {
    display: flex;
    gap: 10px;
}

.social-btn {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--on-surface-variant);
    text-decoration: none;
    transition: var(--transition);
}

.social-btn:hover {
    background: var(--on-surface);
    color: var(--background);
    border-color: transparent;
    transform: translateY(-2px);
}

/* ========== Footer ========== */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--glass-border);
    padding: 32px 24px;
    text-align: center;
}

.footer-content {
    max-width: 1100px;
    margin: 0 auto;
}

.footer-logo {
    font-size: 18px;
    font-weight: 800;
    color: var(--on-surface);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.footer p {
    color: var(--on-surface-variant);
    font-size: 13px;
}

/* ========== Search Overlay ========== */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--surface-solid);
    backdrop-filter: blur(30px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 300;
    padding: 16px;
    transform: translateY(-100%);
    transition: transform var(--transition);
}

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

.search-box {
    display: flex;
    align-items: center;
    max-width: 500px;
    margin: 0 auto;
    gap: 12px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 8px 16px;
}

.search-box .material-icons {
    color: var(--on-surface-variant);
    font-size: 20px;
}

.search-box input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 14px;
    color: var(--on-surface);
    outline: none;
}

.search-box input::placeholder {
    color: var(--on-surface-variant);
}

/* ========== Article Page ========== */
.article-page {
    max-width: 760px;
    margin: 0 auto;
    padding: 100px 24px 80px;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--on-surface-variant);
    text-decoration: none;
    font-weight: 500;
    font-size: 13px;
    margin-bottom: 32px;
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.back-btn:hover {
    color: var(--on-surface);
    gap: 10px;
}

.article-hero {
    height: 360px;
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 32px;
    position: relative;
}

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

.article-hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 40%;
    background: linear-gradient(to top, rgba(0,0,0,0.5), transparent);
}

.article-header {
    margin-bottom: 32px;
}

.article-header h1 {
    font-size: clamp(28px, 5vw, 40px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    color: var(--on-surface-variant);
    font-size: 13px;
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-meta .material-icons {
    font-size: 16px;
}

.article-body {
    background: var(--surface);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 40px;
}

.article-body h2 {
    font-size: 22px;
    font-weight: 700;
    margin: 32px 0 16px;
    color: var(--on-surface);
    padding-bottom: 10px;
    border-bottom: 1px solid var(--glass-border);
}

.article-body h3 {
    font-size: 18px;
    font-weight: 700;
    margin: 24px 0 12px;
    color: var(--on-surface);
}

.article-body p {
    margin-bottom: 16px;
    color: var(--on-surface);
    line-height: 1.8;
    font-size: 15px;
}

.article-body code {
    background: var(--glass);
    padding: 3px 8px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    color: var(--on-surface);
}

.article-body pre {
    background: #0a0a0f;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    padding: 20px;
    overflow-x: auto;
    margin-bottom: 20px;
    position: relative;
}

[data-theme="light"] .article-body pre {
    background: #f6f8fa;
}

.article-body pre::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 16px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ff5f57;
    box-shadow: 16px 0 0 #ffbd2e, 32px 0 0 #28c840;
}

.article-body pre code {
    background: transparent;
    padding: 0;
    color: #e0e0e0;
    font-size: 13px;
    line-height: 1.7;
    display: block;
    padding-top: 16px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

[data-theme="light"] .article-body pre code {
    color: #24292e;
}

/* Custom Syntax Highlighting - Deep Dark Theme */
.article-body pre code .token.comment,
.article-body pre code .token.prolog,
.article-body pre code .token.doctype,
.article-body pre code .token.cdata {
    color: #5c6370;
}

.article-body pre code .token.punctuation {
    color: #abb2bf;
}

.article-body pre code .token.property,
.article-body pre code .token.tag,
.article-body pre code .token.boolean,
.article-body pre code .token.number,
.article-body pre code .token.constant,
.article-body pre code .token.symbol {
    color: #d19a66;
}

.article-body pre code .token.selector,
.article-body pre code .token.attr-name,
.article-body pre code .token.string,
.article-body pre code .token.char,
.article-body pre code .token.builtin {
    color: #98c379;
}

.article-body pre code .token.operator,
.article-body pre code .token.entity,
.article-body pre code .token.url {
    color: #56b6c2;
}

.article-body pre code .token.atrule,
.article-body pre code .token.attr-value,
.article-body pre code .token.keyword {
    color: #c678dd;
}

.article-body pre code .token.function,
.article-body pre code .token.class-name {
    color: #61afef;
}

.article-body pre code .token.regex,
.article-body pre code .token.important,
.article-body pre code .token.variable {
    color: #c678dd;
}

.article-body pre code .token.string {
    color: #98c379;
}

.article-body pre code .token.boolean {
    color: #d19a66;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: #08080c;
    border-bottom: 1px solid #1a1a24;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    margin-bottom: -20px;
}

[data-theme="light"] .code-header {
    background: #e1e4e8;
    border-bottom-color: #d1d5da;
}

.code-lang {
    font-size: 12px;
    color: #5c6370;
    font-weight: 600;
    text-transform: uppercase;
}

[data-theme="light"] .code-lang {
    color: #57606a;
}

.copy-btn {
    background: transparent;
    border: none;
    color: #5c6370;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: rgba(255,255,255,0.1);
    color: #c9d1d9;
}

[data-theme="light"] .copy-btn:hover {
    background: rgba(0,0,0,0.1);
    color: #24292e;
}

.copy-btn .material-icons-round {
    font-size: 14px;
}

.article-body ul, .article-body ol {
    margin-bottom: 16px;
    padding-left: 24px;
}

.article-body li {
    margin-bottom: 8px;
    line-height: 1.7;
    color: var(--on-surface);
    font-size: 15px;
}

.article-body blockquote {
    border-left: 3px solid var(--on-surface);
    padding: 16px 20px;
    margin: 20px 0;
    background: var(--glass);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic;
    color: var(--on-surface-variant);
    font-size: 14px;
}

/* ========== Responsive ========== */
@media (max-width: 900px) {
    .featured-card {
        grid-template-columns: 1fr;
    }

    .featured-card .card-image {
        height: 200px;
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-card {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-avatar {
        margin: 0 auto;
    }

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 600px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .categories-grid {
        grid-template-columns: 1fr 1fr;
    }

    .stats-bar {
        gap: 32px;
    }

    .stat-number {
        font-size: 32px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .article-body {
        padding: 24px;
    }
}

/* ========== Scroll Animations ========== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}