:root {
    --bg-primary: #1a1b26;
    --bg-secondary: #16161e;
    --bg-tertiary: #24283b;
    --text-primary: #c0caf5;
    --text-secondary: #a9b1d6;
    --text-muted: #565f89;
    --accent-blue: #7aa2f7;
    --accent-cyan: #7dcfff;
    --accent-green: #9ece6a;
    --accent-yellow: #e0af68;
    --accent-red: #f7768e;
    --accent-purple: #bb9af7;
    --border: #414868;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Layout */
.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: transform 0.3s ease;
    z-index: 1000;
}

.sidebar.closed {
    transform: translateX(-280px);
}

.sidebar-header {
    padding: 2rem 1.5rem 1rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
    font-size: 1.5rem;
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
}

.sidebar-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.nav-list {
    list-style: none;
    padding: 1rem 0;
}

.nav-item {
    margin: 0.25rem 0;
}

.nav-link {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: var(--bg-tertiary);
    color: var(--accent-cyan);
    border-left-color: var(--accent-cyan);
}

.nav-link.active {
    background: var(--bg-tertiary);
    color: var(--accent-blue);
    border-left-color: var(--accent-blue);
}

/* Toggle Button */
.toggle-btn {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1001;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--accent-cyan);
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    border-radius: 4px;
    font-size: 1.2rem;
    transition: all 0.2s;
}

.toggle-btn:hover {
    background: var(--accent-cyan);
    color: var(--bg-primary);
}

.sidebar:not(.closed) ~ .toggle-btn {
    left: calc(280px + 1rem);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    padding: 3rem 2rem;
    width: 100%;
    max-width: 1400px;
    transition: margin-left 0.3s ease;
}

.sidebar.closed ~ .main-content {
    margin-left: 0;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--accent-cyan);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    margin-top: 0;
}

h2 {
    font-size: 2rem;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
    color: var(--accent-blue);
}

h4 {
    font-size: 1.2rem;
    color: var(--accent-purple);
}

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

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

a:hover {
    text-decoration: underline;
}

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

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-bottom: none;
    border-radius: 4px 4px 0 0;
}

.code-lang {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
}

.copy-btn {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--accent-cyan);
    padding: 0.25rem 0.75rem;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.85rem;
    transition: all 0.2s;
}

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

.copy-btn.copied {
    background: var(--accent-green);
    color: var(--bg-primary);
}

pre {
    margin: 0;
    border-radius: 0 0 4px 4px;
    border: 1px solid var(--border);
    overflow-x: auto;
}

pre code {
    display: block;
    padding: 1rem;
    background: var(--bg-secondary);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
}

code {
    background: var(--bg-tertiary);
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9em;
    color: var(--accent-green);
}

/* Feature Cards */
.feature {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.feature-title {
    color: var(--accent-yellow);
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.feature-tags {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.tag {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.tag-strength {
    background: rgba(158, 206, 106, 0.2);
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}

.tag-limitation {
    background: rgba(247, 118, 142, 0.2);
    color: var(--accent-red);
    border: 1px solid var(--accent-red);
}

.tag-implication {
    background: rgba(187, 154, 247, 0.2);
    color: var(--accent-purple);
    border: 1px solid var(--accent-purple);
}

/* Lists */
ul, ol {
    margin: 1rem 0;
    padding-left: 2rem;
    color: var(--text-secondary);
}

li {
    margin: 0.5rem 0;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background: var(--bg-tertiary);
    color: var(--accent-cyan);
    font-weight: 600;
}

tr:last-child td {
    border-bottom: none;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-280px);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 2rem 1rem;
    }

    .toggle-btn {
        left: 1rem;
    }

    .sidebar:not(.closed) ~ .toggle-btn {
        left: calc(280px + 1rem);
    }
}

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

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

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

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