:root {
    --primary-color: #0d47a1;
    --secondary-color: #1565c0;
    --accent-color: #2196f3;
    --bg-gradient: linear-gradient(135deg, #0d47a1 0%, #1976d2 50%, #42a5f5 100%);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.3);
    --text-main: #1a237e;
    --text-muted: #546e7a;
    --error-color: #d32f2f;
}

body, html {
    min-height: 100%;
    margin: 0;
    font-family: 'Sarabun', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main);
}

.login-container {
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-gradient);
    position: relative;
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    padding: 1rem; /* Padding for mobile view to prevent touching edges */
    box-sizing: border-box;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../adminlte/img/DJI_0055-2.jpg') no-repeat center center;
    background-size: cover;
    opacity: 0.15;
    z-index: 1;
}

.login-card {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 450px;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    padding: 3rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    box-sizing: border-box;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 35px 60px -15px rgba(0, 0, 0, 0.3);
}

.login-logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo img {
    height: 60px;
    max-width: 100%;
    object-fit: contain;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.login-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.4;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 12px;
    border: 2px solid rgba(0,0,0,0.05);
    background: rgba(255,255,255,0.7);
    font-size: 1rem;
    transition: all 0.3s ease;
    box-sizing: border-box;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(33, 150, 243, 0.1);
}

.student-type-selector {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.type-option {
    flex: 1;
    position: relative;
}

.type-option label {
    display: block;
    padding: 0.65rem 0.25rem;
    text-align: center;
    background: rgba(0,0,0,0.03);
    border: 2px solid transparent;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.type-option input[type="radio"]:checked + label {
    background: #fff;
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(13, 71, 161, 0.1);
}

.btn-login {
    width: 100%;
    padding: 1rem;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Mobile Responsiveness */
@media (max-width: 480px) {
    .login-container {
        padding: 0.5rem;
        align-items: flex-start; /* Start from top on mobile to allow scrolling */
        padding-top: 2rem;
    }

    .login-card {
        padding: 1.5rem;
        border-radius: 20px;
    }
    
    .login-logo img {
        height: 50px;
    }

    .login-header h1 {
        font-size: 1.5rem;
    }

    .login-header p {
        font-size: 0.85rem;
    }

    .form-control {
        padding: 0.75rem;
    }

    .student-type-selector {
        gap: 0.5rem;
    }
    
    .type-option label {
        font-size: 0.8rem;
        padding: 0.6rem 0.2rem;
    }
}

.floating-shapes div {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20%;
    z-index: 1;
    animation: float 20s infinite linear;
}

@keyframes float {
    from { transform: translateY(100vh) rotate(0deg); }
    to { transform: translateY(-20vh) rotate(360deg); }
}