/* ===== CSS Variables ===== */
:root {
    --bg: #fafaf9;
    --bg-secondary: #f5f5f4;
    --bg-tertiary: #e7e5e4;
    --text: #1c1917;
    --text-secondary: #57534e;
    --muted: #78716c;
    --link: #0369a1;
    --link-hover: #0284c7;
    --accent: #0f766e;
    --accent-light: #14b8a6;
    --border: rgba(0,0,0,0.1);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-sm: 4px;
    --transition: 0.15s ease;
    --code-bg: #1e1e1e;
    --code-green: #4ec9b0;
    --code-blue: #569cd6;
    --code-orange: #ce9178;
}
[data-theme='dark'] {
    --bg: #0c0c0c;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #262626;
    --text: #e5e5e5;
    --text-secondary: #a3a3a3;
    --muted: #737373;
    --link: #38bdf8;
    --link-hover: #7dd3fc;
    --accent: #2dd4bf;
    --accent-light: #5eead4;
    --border: rgba(255,255,255,0.1);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 20px 40px rgba(0,0,0,0.5);
    --code-bg: #0d0d0d;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--link-hover); }
img { max-width: 100%; height: auto; }
h1, h2, h3, h4 { 
    font-weight: 700; 
    line-height: 1.2; 
    letter-spacing: -0.02em;
    margin: 0 0 1rem;
}
p { margin: 0 0 1rem; }

/* ===== Layout ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-alt { background: var(--bg-secondary); }
.section-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    text-align: center;
}
.section-subtitle {
    color: var(--text-secondary);
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.navbar-brand {
    font-weight: 700;
    font-size: 18px;
    color: var(--text) !important;
}
.navbar-brand-symbol {
    color: var(--accent);
    font-family: 'JetBrains Mono', monospace;
}
.navbar-brand-text {
    font-family: 'JetBrains Mono', monospace;
}
.navbar-links {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}
.navbar-links a {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary) !important;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}
.navbar-links a:hover {
    color: var(--text) !important;
    background: var(--bg-secondary);
}
.navbar-links .icon-link {
    padding: 8px;
    font-size: 1.25rem;
}
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: all var(--transition);
}
#theme-toggle:hover { background: var(--bg-secondary); color: var(--text); }

/* ===== Hero Section ===== */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--bg) 0%, var(--bg-secondary) 100%);
}
.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--text);
}
.hero-content h1 .cursor {
    display: inline-block;
    width: 3px;
    height: 0.9em;
    background: var(--accent);
    margin-left: 4px;
    animation: blink 1s step-end infinite;
    vertical-align: baseline;
}
@keyframes blink { 50% { opacity: 0; } }
.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    cursor: pointer;
    border: none;
}
.btn-primary {
    background: var(--link);
    color: white !important;
}
.btn-primary:hover {
    background: var(--link-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.hero-image {
    position: relative;
}
.avatar-large {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--bg);
    box-shadow: var(--shadow-lg);
}

/* ===== Book Feature ===== */
.book-feature {
    background: linear-gradient(135deg, #18181b 0%, #27272a 100%);
    color: white;
    border-radius: var(--radius);
    padding: 60px;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 60px;
    align-items: center;
    margin-top: -40px;
    position: relative;
    z-index: 10;
    border: 1px solid rgba(255,255,255,0.1);
}
[data-theme='dark'] .book-feature {
    background: linear-gradient(135deg, #0a0a0a 0%, #171717 100%);
}
.book-cover {
    width: 200px;
    border-radius: var(--radius-sm);
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
    transform: perspective(1000px) rotateY(-5deg);
    transition: transform var(--transition);
}
.book-cover:hover {
    transform: perspective(1000px) rotateY(0deg) scale(1.05);
}
.book-info h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: white;
}
.book-info p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}
.book-badges {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: rgba(255,255,255,0.15);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* ===== Projects Grid ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
}
.project-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
}
.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--link);
}
.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: var(--bg-tertiary);
}
.project-content {
    padding: 24px;
}
.project-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.project-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: var(--code-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--code-green);
    font-weight: 500;
}
.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
}
.project-stars {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.875rem;
    color: var(--muted);
}
.project-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 16px;
}
.project-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.tag {
    padding: 3px 10px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 400;
    color: var(--text-secondary);
}

/* ===== Blog Cards ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
}
.blog-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}
.blog-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.blog-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}
.blog-card-content {
    padding: 24px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.blog-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 0.875rem;
    color: var(--muted);
}
.blog-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    line-height: 1.4;
}
.blog-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex: 1;
}
.blog-card-tags {
    display: flex;
    gap: 8px;
    margin-top: auto;
    padding-top: 16px;
}

/* ===== Podcast Section ===== */
.podcast-list {
    display: grid;
    gap: 16px;
    max-width: 800px;
    margin: 0 auto;
}
.podcast-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 20px;
    align-items: center;
    padding: 20px 24px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.podcast-item:hover {
    border-color: var(--link);
    box-shadow: var(--shadow);
}
.podcast-show {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--accent);
    min-width: 140px;
}
.podcast-title {
    font-weight: 500;
}
.podcast-date {
    color: var(--muted);
    font-size: 0.875rem;
    white-space: nowrap;
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid var(--border);
}
.footer-social {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}
.footer-social a {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 50%;
    font-size: 1.25rem;
    color: var(--text-secondary) !important;
    transition: all var(--transition);
}
.footer-social a:hover {
    background: var(--link);
    color: white !important;
    transform: translateY(-2px);
}
.footer-text {
    color: var(--muted);
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-content h1 { font-size: 2.5rem; }
    .hero-image { display: flex; justify-content: center; }
    .book-feature { 
        grid-template-columns: 1fr; 
        text-align: center; 
        padding: 40px;
    }
    .book-cover { margin: 0 auto; }
    .book-badges { justify-content: center; }
    .navbar-links { display: none; }
    .projects-grid, .blog-grid { grid-template-columns: 1fr; }
    .podcast-item { grid-template-columns: 1fr; gap: 8px; }
    .podcast-show { min-width: auto; }
}

/* ===== View All Link ===== */
.view-all {
    text-align: center;
    margin-top: 40px;
}
.view-all a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--link) !important;
    cursor: pointer;
}
.view-all a:hover {
    gap: 12px;
}

/* Hidden articles toggle */
.blog-card.hidden-article {
    display: none;
}
.blog-grid.show-all .blog-card.hidden-article {
    display: flex;
}
.view-all.expanded .show-more {
    display: none;
}
.view-all:not(.expanded) .show-less {
    display: none;
}

/* Hidden podcasts toggle */
.podcast-item.hidden-podcast {
    display: none;
}
.podcast-list.show-all .podcast-item.hidden-podcast {
    display: grid;
}