:root {
    --primary-color: #6200EE;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --bg-main: #ffffff;
    --bg-sidebar: #f8f9fa;
    --border-color: #e0e0e0;
    --font-family: 'Roboto', 'Inter', system-ui, -apple-system, sans-serif;
    --code-bg: #f1f3f4;
}

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

body {
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--bg-main);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top Navigation Bar */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 64px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-main);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    font-size: 1.1rem;
}

.nav-left svg {
    width: 24px;
    height: 24px;
}

.nav-center {
    flex-grow: 1;
    max-width: 400px;
    margin: 0 24px;
}

.search-input {
    width: 100%;
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-sidebar);
    font-family: var(--font-family);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    background-color: var(--bg-main);
}

.nav-right {
    display: flex;
    gap: 16px;
}

.nav-right a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-right a:hover {
    color: var(--primary-color);
}

/* Main Layout */
.container {
    display: flex;
    flex: 1;
    max-width: 1440px;
    margin: 0 auto;
    width: 100%;
}

/* Sidebar */
.sidebar {
    width: 280px;
    flex-shrink: 0;
    border-right: 1px solid var(--border-color);
    padding: 24px 0;
    overflow-y: auto;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
}

.nav-group {
    margin-bottom: 16px;
}

.nav-group-title {
    padding: 8px 24px;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-item {
    display: block;
    padding: 8px 24px 8px 32px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s, background-color 0.2s;
}

.nav-item:hover {
    color: var(--primary-color);
    background-color: rgba(98, 0, 238, 0.04);
}

.nav-item.active {
    color: var(--primary-color);
    font-weight: 500;
    background-color: rgba(98, 0, 238, 0.08);
    border-right: 3px solid var(--primary-color);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 48px 64px;
    max-width: 900px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 400;
    margin-bottom: 24px;
    color: var(--text-primary);
}

h2 {
    font-size: 1.8rem;
    font-weight: 400;
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

h3 {
    font-size: 1.3rem;
    font-weight: 500;
    margin-top: 32px;
    margin-bottom: 12px;
}

p {
    margin-bottom: 16px;
    color: var(--text-secondary);
    font-size: 1rem;
}

ul, ol {
    margin-bottom: 16px;
    padding-left: 24px;
    color: var(--text-secondary);
}

li {
    margin-bottom: 8px;
}

code {
    font-family: 'Courier New', Courier, monospace;
    background-color: var(--code-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: #d63384;
}

pre {
    background-color: var(--code-bg);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

pre code {
    background-color: transparent;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    transition: box-shadow 0.2s, transform 0.2s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transform: translateY(-2px);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: 0;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: background-color 0.2s;
    cursor: pointer;
    text-align: center;
}

.btn-outline {
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    background-color: transparent;
}

.btn-outline:hover {
    background-color: rgba(98, 0, 238, 0.04);
}

.actions {
    display: flex;
    gap: 16px;
    margin: 32px 0;
    flex-wrap: wrap;
}

/* Hero / Header Section */
.hero {
    text-align: center;
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 3rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.hero .authors {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 24px;
}

.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        top: 0;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    .main-content {
        padding: 32px 24px;
    }
}