:root {
    --bg-color: #121212;
    --sidebar-bg: #1a1a1a;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --primary-color: #4CAF50;
    /* Matching App Green */
    --accent-color: #2196F3;
    --border-color: #333;
    --code-bg: #2d2d2d;
    --card-bg: #1e1e1e;
    --header-height: 60px;
    --sidebar-width: 280px;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
header {
    height: var(--header-height);
    background-color: rgba(18, 18, 18, 0.95);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 2rem;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: #fff;
    text-decoration: none;
}

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

/* Main Layout */
.container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    position: fixed;
    top: var(--header-height);
    bottom: 0;
    overflow-y: auto;
    padding: 2rem 1.5rem;
}

.nav-group {
    margin-bottom: 2rem;
}

.nav-group h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 1rem;
    letter-spacing: 0.5px;
}

.nav-link {
    display: block;
    color: var(--text-color);
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    margin: 0.25rem 0;
    border-radius: 6px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--primary-color);
}

.nav-link.active {
    background-color: rgba(76, 175, 80, 0.15);
    color: var(--primary-color);
    font-weight: 500;
}

/* Content */
main {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 3rem 4rem;
    max-width: 1200px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;

    background: linear-gradient(to right, #fff, #a0a0a0);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;

}

h2 {
    font-size: 1.75rem;
    margin-top: 3rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

h3 {
    font-size: 1.25rem;
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    color: #fff;
}

p {
    margin-bottom: 1.25rem;
    color: #ccc;
    font-size: 1.05rem;
}

ul {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
    color: #ccc;
}

code {
    background-color: var(--code-bg);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9em;
    color: #ff9e80;
}

pre {
    background-color: var(--code-bg);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

pre code {
    background: none;
    padding: 0;
    color: #e0e0e0;
}

/* Cards Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    border-color: var(--primary-color);
}

.card h3 {
    margin-top: 0;
    color: var(--primary-color);
}

/* Note Boxes */
.note {
    background-color: rgba(33, 150, 243, 0.1);
    border-left: 4px solid var(--accent-color);
    padding: 1rem 1.5rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.note-warning {
    background-color: rgba(244, 67, 54, 0.1);
    border-left-color: #f44336;
}

.note h4 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    color: #fff;
    font-size: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: static;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    main {
        margin-left: 0;
        padding: 2rem;
    }
}