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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f4f8;
    color: #333;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: #0077cc;
}

a:hover {
    color: #005fa3;
}

/* Header */
header {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header .logo {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
}

header nav a {
    color: #fff;
    margin-left: 1.5rem;
    font-weight: 500;
    transition: opacity 0.3s;
}

header nav a:hover {
    opacity: 0.8;
}

/* Footer */
footer {
    background: #1e3c72;
    color: #ccc;
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
}

footer p {
    font-size: 0.9rem;
}

/* Main content */
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1e3c72;
}

h2 {
    font-size: 2rem;
    margin-bottom: 0.8rem;
    color: #2a5298;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #333;
}

p {
    margin-bottom: 1rem;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.08);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.card h3 {
    margin-bottom: 0.5rem;
}

.card p {
    color: #666;
    font-size: 0.95rem;
}

.btn {
    display: inline-block;
    background: #2a5298;
    color: #fff;
    padding: 0.6rem 1.5rem;
    border-radius: 25px;
    font-weight: 600;
    transition: background 0.3s;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background: #1e3c72;
}

/* Feature list */
.feature-list {
    list-style: none;
    margin: 1.5rem 0;
}

.feature-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    align-items: center;
}

.feature-list li::before {
    content: "✓";
    color: #2a5298;
    font-weight: bold;
    margin-right: 0.8rem;
}

/* Table for admin */
table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

th, td {
    padding: 0.8rem 1rem;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

th {
    background: #2a5298;
    color: #fff;
    font-weight: 600;
}

tr:hover {
    background: #f5f9ff;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    header nav a {
        margin: 0.5rem 1rem 0 0;
    }
    h1 {
        font-size: 2rem;
    }
}