/* --- START OF FILE style.css --- */

/* --- Foundational Styles & Variables --- */
:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111115;
    --glass-bg: rgba(26, 26, 32, 0.7);
    --glass-border: rgba(255, 255, 255, 0.12);
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --gradient-primary: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-cyan) 100%);
    --radius-lg: 16px;
    --radius-md: 12px;
}

/* --- Global & Body Styles --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

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

/* --- Decorative Background --- */
.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(circle at 15% 25%, rgba(139, 92, 246, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 85% 75%, rgba(6, 182, 212, 0.15) 0%, transparent 40%);
}

/* --- Header --- */
.site-header {
    text-align: center;
    padding: 3rem 1rem;
}

.site-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

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

/* --- Main Layout: Sidebar + Content --- */
.main-layout {
    display: flex;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem 3rem;
    align-items: flex-start;
}

/* --- Sidebar Navigation --- */
.sidebar-nav {
    position: sticky;
    top: 2rem;
    flex: 0 0 240px; /* Slightly wider to accommodate longer titles */
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
}

.sidebar-nav h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    padding-left: 1rem;
    color: var(--text-primary);
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.3s ease;
    border: 2px solid transparent;
    margin: 0.25rem 0;
    font-size: 0.95rem;
}

.sidebar-nav a:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.sidebar-nav a.active {
    color: var(--text-primary);
    font-weight: 600;
    box-shadow: 0 0 12px -2px var(--accent-cyan);
    border-color: var(--glass-border);
    background-color: var(--bg-secondary);
}

/* --- Main Content Area --- */
.content {
    flex: 1;
    min-width: 0;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 2rem;
}

h2, h3, h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}
h2 { font-size: 1.8rem; margin-top: 1rem; border-bottom: 1px solid var(--glass-border); padding-bottom: 0.75rem; }
h3 { font-size: 1.4rem; margin-top: 1.5rem; }
h4 { font-size: 1.1rem; margin-top: 1.25rem; color: var(--accent-cyan); }

p, ul, ol { margin-bottom: 1rem; color: var(--text-secondary); }
ul, ol { padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; }
a { color: var(--accent-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { color: var(--text-primary); font-weight: 600; }

.responsive-img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1rem 0;
    border: 1px solid var(--glass-border);
}

/* --- Code Block Styling --- */
.code-block-wrapper {
    position: relative;
    margin: 1.5rem 0;
}

pre {
    background-color: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    overflow-x: auto;
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-all;
}

pre.file-structure {
    background-color: rgba(3, 7, 18, 0.5);
    color: #cbd5e1;
    line-height: 1.5;
}

.copy-btn {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
    line-height: 0;
}

.copy-btn:hover {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.copy-btn.copied {
    color: var(--accent-cyan);
}

/* --- Responsive Design for Mobile --- */
@media (max-width: 900px) {
    .main-layout {
        flex-direction: column;
    }

    .sidebar-nav {
        position: static;
        width: 100%;
        margin-bottom: 2rem;
        max-height: none;
        flex: 1 1 auto;
    }
    
    .sidebar-nav ul {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    .sidebar-nav a {
        border: none;
        background-color: var(--bg-secondary);
    }
    .sidebar-nav a.active {
        background: var(--gradient-primary);
        font-weight: 600;
        color: var(--text-primary);
        box-shadow: none;
    }
}

@media (max-width: 600px) {
    .site-header h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.2rem; }
    .glass-card { padding: 1.5rem; }
}