:root {
    --primary: #2563eb;
    --secondary: #64748b;
    --dark: #0f172a;
    --light: #f8fafc;
    --accent: #3b82f6;
}

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

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: #fff;
    scroll-behavior: smooth;
}

nav {
    position: sticky;
    top: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 1000;
}

.logo { font-weight: 700; font-size: 1.2rem; color: var(--primary); }
.nav-links { display: flex; list-style: none; gap: 2rem; }
.nav-links a { text-decoration: none; color: var(--secondary); font-weight: 500; }

header {
    padding: 100px 10% 60px;
    background: linear-gradient(135deg, #f1f5f9 0%, #fff 100%);
    text-align: center;
}

h1 { font-size: 3rem; margin-bottom: 0.5rem; }
.subtitle { font-size: 1.5rem; color: var(--secondary); margin-bottom: 1.5rem; }

section { padding: 80px 10%; }
.section-title {
    font-size: 2rem;
    margin-bottom: 3rem;
    border-left: 5px solid var(--primary);
    padding-left: 15px;
}

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }

.card {
    background: #fff;
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
}

.date { color: var(--primary); font-size: 0.9rem; font-weight: 600; margin-bottom: 1rem; display: block; }

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

.tag {
    background: #eff6ff;
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

footer {
    background: var(--dark);
    color: white;
    padding: 40px 10%;
    text-align: center;
}

/* FFT Writeup styles */
.writeup-section { padding: 80px 10%; }

.writeup-intro {
    max-width: 780px;
    margin-bottom: 3rem;
    color: var(--secondary);
    font-size: 1.05rem;
}

.writeup-block {
    margin-bottom: 3.5rem;
}

.writeup-block h3 {
    font-size: 1.2rem;
    color: var(--dark);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.writeup-block h3::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
}

.writeup-block p {
    color: #334155;
    margin-bottom: 1.25rem;
    max-width: 780px;
    line-height: 1.75;
}

.code-card {
    background: #0f172a;
    border-radius: 10px;
    overflow: hidden;
    margin: 1.25rem 0;
    box-shadow: 0 4px 24px rgba(0,0,0,0.15);
}

.code-card-header {
    background: #1e293b;
    padding: 0.5rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.code-card-header span {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.78rem;
    color: #94a3b8;
}

.code-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.dot-red   { background: #ef4444; }
.dot-yellow{ background: #eab308; }
.dot-green { background: #22c55e; }

.code-card pre {
    margin: 0;
    padding: 1.25rem 1.5rem;
    overflow-x: auto;
}

.code-card code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.7;
    color: #e2e8f0;
    white-space: pre;
}

/* Token colors */
.kw  { color: #93c5fd; }   /* keywords */
.ty  { color: #86efac; }   /* types */
.fn  { color: #fde68a; }   /* function names */
.cm  { color: #64748b; font-style: italic; } /* comments */
.st  { color: #fca5a5; }   /* strings */
.nu  { color: #f9a8d4; }   /* numbers */
.op  { color: #94a3b8; }   /* operators */

/* Prose styles for markdown-rendered pages */
.writeup-section h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    border-left: 5px solid var(--primary);
    padding-left: 15px;
}

.writeup-section h2 {
    font-size: 1.4rem;
    margin-top: 3rem;
    margin-bottom: 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid #e2e8f0;
}

.writeup-section h3 {
    font-size: 1.15rem;
    margin-top: 2rem;
    margin-bottom: 0.6rem;
    color: var(--dark);
}

.writeup-section p {
    color: #334155;
    margin-bottom: 1.25rem;
    max-width: 780px;
    line-height: 1.75;
}

.writeup-section ul,
.writeup-section ol {
    margin: 0 0 1.25rem 1.5rem;
    max-width: 780px;
}

.writeup-section li {
    color: #334155;
    line-height: 1.75;
    margin-bottom: 0.3rem;
}

.writeup-section li ul,
.writeup-section li ol {
    margin-top: 0.3rem;
    margin-bottom: 0;
}

.writeup-section hr {
    border: none;
    border-top: 1px solid #e2e8f0;
    margin: 2.5rem 0;
}

.writeup-section pre {
    background: #0f172a;
    border-radius: 10px;
    padding: 1.25rem 1.5rem;
    overflow-x: auto;
    margin: 1.25rem 0 1.75rem;
    box-shadow: 0 4px 24px rgba(0,0,0,0.15);
}

.writeup-section pre code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.7;
    color: #e2e8f0;
    background: none;
    padding: 0;
    border-radius: 0;
}

.writeup-section code {
    background: #eff6ff;
    color: var(--primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85em;
}

.writeup-section strong {
    color: var(--dark);
}

.writeup-divider {
    border: none;
    border-top: 1px solid #e2e8f0;
    margin: 3rem 0;
}

.inline-code {
    background: #eff6ff;
    color: var(--primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85em;
}