:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --text: #1f2937;
    --muted: #6b7280;
    --bg: #f9fafb;
    --card: #ffffff;
    --border: #e5e7eb;
}

html, body {
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  flex-direction: column;
}

* {
    box-sizing: border-box;
}

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

header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

nav {
    max-width: 1100px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    gap: 20px;
    align-items: center;
}

nav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
}

nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: 0.3s;
}

nav a:hover::after {
    width: 100%;
}

.container {
    width: 100%;
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

h1 {
    font-size: 32px;
    margin-bottom: 10px;
}

p {
    color: var(--muted);
    line-height: 1.6;
}

footer {
    background: var(--card);
    border-top: 1px solid var(--border);
    margin-top: 60px;
}

footer p {
    margin: 5px 0;
}

footer {
    padding: 30px 20px;
    text-align: center;
    margin-top: auto;
}

/* Card style (optional for sections) */
.card {
    background: var(--card);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 25px rgba(0,0,0,0.04);
}

/* Buttons (optional) */
.button {
    display: inline-block;
    padding: 10px 16px;
    background: var(--primary);
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: 0.2s;
}

.button:hover {
    background: var(--primary-dark);
}

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-wrap: wrap;
        gap: 10px;
    }

    h1 {
        font-size: 24px;
    }
}