:root {
    --bg: #ffffff;
    --secondary-bg: #f7f8fa;
    --sidebar-bg: #f7f8fa;
    --card: #ffffff;
    --text: #37352f;
    --muted: #787774;
    --border: #e9e9e7;
    --hover-bg: #eeefef;
    --accent: #2383e2;
    --accent-light: #e8f3ff;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
}

body.dark-mode {
    --bg: #191919;
    --secondary-bg: #1a1a1a;
    --sidebar-bg: #111111;
    --card: #1f1f1f;
    --text: #e3e3e3;
    --muted: #9b9b9b;
    --border: #2a2a2a;
    --hover-bg: #2a2a2a;
    --accent: #4a9eff;
    --accent-light: #1a2a3a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    margin-left: 240px;
    transition: background 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 900px;
    margin: auto;
    padding: 4rem 3rem;
}

.section {
    margin-bottom: 5rem;
}

h2 {
    margin-bottom: 2rem;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
}

.links {
    display: flex;
    gap: 1rem;
}

.links a {
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--text);
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
}

.links a:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: var(--shadow-hover);
}

@media (max-width: 768px) {
    body {
        margin-left: 0;
        padding-top: 80px;
    }

    .container {
        padding: 2rem 1.5rem;
    }
}