:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --oxford-blue: #002147;
    --oxford-light: #003d82;
}

body {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    max-width: 450px;
    width: 100%;
}

.login-header {
    background: linear-gradient(135deg, var(--oxford-blue) 0%, var(--oxford-light) 100%);
    color: white;
    padding: 20px 30px;
}

.college-logo {
    width: 80px;
    height: 80px;
    background: white;
    border-radius: 10%;
    padding: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.college-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 5px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.college-location {
    font-size: 14px;
    opacity: 0.9;
}

.login-body {
    padding: 40px 30px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #333;
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--oxford-blue);
    box-shadow: 0 0 0 3px rgba(0, 33, 71, 0.1);
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--oxford-blue) 0%, var(--oxford-light) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 33, 71, 0.3);
}

.btn-login:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    transform: none;
}

.btn-outline-secondary {
    width: 100%;
    padding: 12px;
    background: white;
    color: var(--oxford-blue);
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-outline-secondary:hover {
    background: #f8f9fa;
    border-color: var(--oxford-blue);
}

.btn-close {
    padding: 0.5rem;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.5;
}

.btn-close:hover {
    opacity: 1;
}

.btn-link {
    background: none;
    border: none;
    color: var(--oxford-blue);
    text-decoration: none;
    cursor: pointer;
    padding: 5px 10px;
    font-size: 14px;
}

.btn-link:hover {
    text-decoration: underline;
}

.btn-send-otp {
    width: 100%;
    padding: 14px;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 15px;
}

.btn-send-otp:hover {
    background: #157347;
}

.btn-send-otp:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
}

.alert {
    padding: 12px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-success {
    background: #d1e7dd;
    color: #0f5132;
    border: 1px solid #badbcc;
}

.alert-danger {
    background: #f8d7da;
    color: #842029;
    border: 1px solid #f5c2c7;
}

.alert-info {
    background: #cff4fc;
    color: #055160;
    border: 1px solid #b6effb;
}

.spinner-border {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner 0.75s linear infinite;
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}

.footer-text {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    color: var(--secondary-color);
    font-size: 13px;
}

.footer-text a {
    color: var(--oxford-blue);
    text-decoration: none;
    font-weight: 600;
}

.footer-text a:hover {
    text-decoration: underline;
}

.otp-input {
    text-align: center;
    font-size: 24px;
    letter-spacing: 10px;
    font-weight: 600;
}

.password-toggle {
    position: relative;
}

.password-toggle-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--secondary-color);
    cursor: pointer;
    padding: 5px;
}

.hidden {
    display: none;
}

@media (max-width: 576px) {
    .login-card {
        margin: 10px;
    }

    .college-name {
        font-size: 20px;
    }

    .login-body {
        padding: 30px 20px;
    }
}