:root {
    --bg: #f8fafc;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #3b82f6;
    --card: #ffffff;
    --border: #e5e7eb;
}

html, body {
    height: 100%;
    margin: 0;
    font-family: "Inter", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

/* LAYOUT */
.layout {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.content {
    flex: 1;
    padding: 24px;
    max-width: 900px;
    margin: 0 auto;
}

/* BUTTON */
.button {
    display: inline-block;
    padding: 10px 16px;
    border-radius: 8px;
    background: var(--primary);
    color: white;
    font-weight: 500;
    transition: all 0.2s ease;
}

.button:hover {
    background: #2563eb;
}

/* LINK */
a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* CARD */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

/* FOOTER */
.footer {
    background: var(--card);
    border-top: 1px solid var(--border);
    padding: 20px;
    text-align: center;
    color: var(--muted);
}