:root {
    --primary: #2563eb;
    --secondary: #7c3aed;
    --accent: #f59e0b;
    --dark: #1e293b;
    --light: #f8fafc;
    --code-bg: #1a1a1a;
}

body {
    margin: 0;
    padding: 0;
    background: #0f172a; 
    font-family: 'Segoe UI', system-ui, sans-serif;
    color: #334155;
    display: flex;
    justify-content: center;
}

.container {
    background: var(--light);
    max-width: 1000px;
    width: 95%;
    margin: 40px 0;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
    overflow: hidden;
}

.header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 60px 20px;
    text-align: center;
}

.section {
    padding: 40px;
    border-bottom: 1px solid #e2e8f0;
}

h2 { color: var(--primary); font-size: 2rem; margin-top: 0; border-left: 5px solid var(--accent); padding-left: 15px; }
h3 { color: var(--secondary); margin-top: 25px; }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 15px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
}

pre {
    background: var(--code-bg);
    color: #e2e8f0;
    padding: 20px;
    border-radius: 12px;
    font-family: 'Consolas', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 15px 0;
    border-left: 5px solid var(--secondary);
    overflow-x: auto;
    white-space: pre;
}

.tip {
    background: #fef3c7;
    border-left: 4px solid var(--accent);
    padding: 15px;
    margin: 10px 0;
    border-radius: 0 8px 8px 0;
}

.keyword { color: #ff7b72; font-weight: bold; }
.func { color: #d2a8ff; }
.string { color: #a5d6ff; }
.comment { color: #8b949e; font-style: italic; }
.op { color: #79c0ff; }

table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

th, td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid #e2e8f0;
}

th { background: #f1f5f9; color: var(--primary); }