body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f4f6f9;
}

/* Header Styles */
.header {
    background: linear-gradient(90deg, #0056b3, #003d80);
    padding: 15px 25px;
    color: white;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 15px;
    flex: 1;
}

.header .logo {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.welcome {
    font-weight: 600;
    font-size: 14px;
    color: #e0e9f5;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: white;
    border-radius: 2px;
    transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 5px;
    flex: 1;
}

.nav-links a {
    color: white;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.nav-links a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.nav-links a.active {
    background-color: rgba(255, 255, 255, 0.3);
    font-weight: 700;
}

.main-header {
    background-color: #0056b3;
    padding: 10px 20px;
    color: white;
    display: flex;
    align-items: center;
}
.logo {
    height: 60px;
    margin-right: 30px;
}
.nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
}
.nav a:hover {
    text-decoration: underline;
}
.main-content {
    padding: 30px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Alert Styles */
.alert {
    padding: 15px 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    border-left: 4px solid;
    display: none;
}

.alert.show {
    display: block;
    animation: slideIn 0.3s ease-in-out;
}

.alert.success {
    background-color: #d4edda;
    color: #155724;
    border-color: #28a745;
}

.alert.error {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #c0392b;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive mobile */
@media (max-width: 768px) {
    .header {
        flex-wrap: wrap;
    }

    .hamburger {
        display: flex;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(90deg, #0056b3, #003d80);
        flex-direction: column;
        gap: 0;
        padding: 10px 0;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
        border-radius: 0;
        width: 100%;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-links a {
        padding: 12px 20px;
        border-radius: 0;
        justify-content: flex-start;
    }

    .header-left {
        width: 100%;
        margin-bottom: 10px;
    }

    .welcome {
        display: none;
    }
}