:root {
    --primary-color: #4e54c8;
    --secondary-color: #8f94fb;
    --background-overlay: rgba(0, 0, 0, 0.4);
    --glass-bg: rgba(255, 255, 255, 0.95);
    /* High opacity white */
    --glass-border: rgba(255, 255, 255, 1);
    --text-color: #333333;
    /* Dark text for readability */
    --input-bg: #f5f5f5;
    /* Light grey input */
    --input-border: #ddd;
    /* Subtle border */
    --button-bg: #4e54c8;
    --button-text: #ffffff;
}

body {
    background-image: url('../imgs/bg_kmitl.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--background-overlay);
    z-index: -1;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 40px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    /* Softer shadow */
    text-align: center;
    color: var(--text-color);
    animation: fadeIn 0.4s ease-out;
    will-change: transform, opacity;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-header h1 {
    font-size: 2.2em;
    font-weight: 700;
    margin-bottom: 5px;
    color: #4e54c8;
    /* Primary color */
}

.login-header h1 strong {
    color: #333;
}

.login-header p {
    font-size: 1.1em;
    margin-bottom: 25px;
    opacity: 0.8;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.95em;
    font-weight: 600;
    letter-spacing: 0.5px;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    color: #333;
    font-size: 1em;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.form-control::placeholder {
    color: #aaa;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(78, 84, 200, 0.1);
}

.btn-login {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: var(--button-bg);
    color: var(--button-text);
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    margin-top: 10px;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(78, 84, 200, 0.3);
}

.alert-error {
    background: rgba(255, 82, 82, 0.8);
    color: white;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9em;
    border: 1px solid rgba(255, 0, 0, 0.2);
    animation: shake 0.5s;
}

@keyframes shake {
    0% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    50% {
        transform: translateX(5px);
    }

    75% {
        transform: translateX(-5px);
    }

    100% {
        transform: translateX(0);
    }
}

/* KMITL specific branding touches */
.kmitl-brand .main-text {
    display: block;
    font-size: 1.2em;
    color: #4e54c8;
    /* Primary Color */
    font-weight: bold;
}

.kmitl-brand .sub-text {
    font-size: 0.8em;
    color: #777;
    /* Darker subtext */
    display: block;
    margin-top: -5px;
}