:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --light-bg: #ecf0f1;
}

body {
    background-color: var(--light-bg);
    font-family: 'Sarabun', sans-serif; /* แนะนำให้ใช้ Google Font Sarabun */
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.main-header {
    background-color: #ffffff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 10px 0;
}
.school-logo {
    height: 50px;
    width: auto;
    margin-right: 15px;
}
.app-title {
    font-weight: bold;
    color: var(--primary-color);
    margin: 0;
}
.school-name {
    font-size: 0.9rem;
    color: #7f8c8d;
}

/* Login Card */
.login-card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Dashboard Menu */
.menu-card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
    height: 100%;
    border-left: 5px solid var(--accent-color);
}
.menu-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.menu-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}
.menu-title {
    font-weight: 600;
    color: var(--secondary-color);
}

/* Footer */
.main-footer {
    margin-top: auto;
    background-color: var(--primary-color);
    color: white;
    padding: 15px 0;
    text-align: center;
    font-size: 0.85rem;
}

/* Color */
.bg-purple {
    background-color: #6f42c1 !important;
    color: white !important;
}