/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --text-primary: #e8e8e8;
    --text-secondary: #a0a0a0;
    --text-muted: #666;
    --accent: #64ffda;
    --accent-dim: #4fd1b0;
    --border: #2a2a2a;
    --code-bg: #1e1e1e;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --max-width: 720px;
    --transition: 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* ===== Container ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header & Navigation ===== */
header {
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 2px;
}

.logo-bracket {
    color: var(--accent);
    font-family: var(--font-mono);
}

.logo-text {
    color: var(--text-primary);
}

.logo:hover .logo-text {
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent);
}

/* ===== Hero Section ===== */
.hero {
    padding: 64px 0 48px;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

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

/* ===== Posts List ===== */
.posts {
    flex: 1;
    padding: 24px 0;
}

.post-card {
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
    transition: all var(--transition);
}

.post-card:first-child {
    padding-top: 0;
}

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

.post-card:hover {
    transform: translateX(4px);
}

.post-card a {
    display: block;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.post-date {
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.post-tag {
    background: var(--bg-tertiary);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.post-title {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    transition: color var(--transition);
}

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

.post-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ===== Single Post Page ===== */
.post-header {
    padding: 48px 0 32px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

.post-header h1 {
    font-size: 2.2rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.post-content {
    padding-bottom: 64px;
}

.post-content h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 48px 0 16px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.post-content h2:first-child {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}

.post-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 32px 0 12px;
    color: var(--accent);
}

.post-content p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.post-content ul,
.post-content ol {
    margin: 0 0 20px 24px;
    color: var(--text-secondary);
}

.post-content li {
    margin-bottom: 8px;
}

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

.post-content em {
    font-style: italic;
}

.post-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 20px;
    margin: 24px 0;
    font-style: italic;
    color: var(--text-secondary);
}

.post-content a {
    border-bottom: 1px solid var(--accent);
}

.post-content a:hover {
    background: rgba(100, 255, 218, 0.1);
}

/* ===== Code Blocks ===== */
.post-content code {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.post-content :not(pre) > code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--accent);
}

.post-content pre {
    background: var(--code-bg) !important;
    border-radius: 8px;
    padding: 20px 24px;
    overflow-x: auto;
    margin: 24px 0;
    border: 1px solid var(--border);
}

.post-content pre code {
    font-size: 0.85rem;
    line-height: 1.6;
}

/* Prism.js theme overrides */
pre[class*="language-"] {
    background: var(--code-bg) !important;
}

code[class*="language-"],
pre[class*="language-"] {
    font-family: var(--font-mono);
    text-shadow: none;
}

/* ===== Images ===== */
.post-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 24px 0;
    border: 1px solid var(--border);
}

/* ===== Back Link ===== */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 24px;
    transition: color var(--transition);
}

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

.back-link::before {
    content: '←';
}

/* ===== Footer ===== */
footer {
    padding: 32px 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== About Page ===== */
.about-content {
    padding: 48px 0;
}

.about-content h1 {
    font-size: 2rem;
    margin-bottom: 24px;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

/* ===== Loading State ===== */
.loading {
    text-align: center;
    padding: 48px 0;
    color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
    .container {
        padding: 0 16px;
    }
    
    header {
        padding: 24px 0;
    }
    
    .hero {
        padding: 40px 0 32px;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .post-title {
        font-size: 1.15rem;
    }
    
    .post-header h1 {
        font-size: 1.6rem;
    }
    
    .nav-links {
        gap: 20px;
    }
    
    .post-content pre {
        padding: 16px;
        margin-left: -16px;
        margin-right: -16px;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Selection ===== */
::selection {
    background: rgba(100, 255, 218, 0.2);
    color: var(--text-primary);
}