:root {
    --primary-color: #d30000;
    --primary-dark: #a00000;
    --secondary-color: #4a6fa5;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #333;
    --error-color: #e74c3c;
    --success-color: #2ecc71;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    background-image: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.login-container {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 450px;
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.login-container:hover {
    transform: translateY(-5px);
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--primary-color);
}

.logo {
    text-align: center;
    margin-bottom: 25px;
}

.logo img {
    height: 50px;
}

.login-container h2 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    font-weight: 600;
    font-size: 28px;
}

.input-group {
    margin-bottom: 20px;
    position: relative;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-gray);
}

.input-group input {
    width: 100%;
    padding: 14px 15px 14px 40px;
    border: 1px solid var(--medium-gray);
    border-radius: 6px;
    font-size: 16px;
    transition: all 0.3s;
}

.input-group input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(211, 0, 0, 0.1);
    outline: none;
}

.input-icon {
    position: absolute;
    left: 15px;
    top: 40px;
    color: var(--dark-gray);
    font-size: 18px;
}

.options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0;
    font-size: 14px;
}

.remember-me {
    display: flex;
    align-items: center;
}

.remember-me input {
    margin-right: 8px;
    accent-color: var(--primary-color);
}

.forgot-password {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.2s;
}

.forgot-password:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: white;
    color: var(--dark-gray);
    border: 1px solid var(--medium-gray);
    margin-top: 15px;
}

.btn-secondary:hover {
    background-color: var(--light-gray);
}

.divider {
    display: flex;
    align-items: center;
    margin: 20px 0;
    color: var(--dark-gray);
    font-size: 14px;
}

.divider::before, .divider::after {
    content: "";
    flex: 1;
    border-bottom: 1px solid var(--medium-gray);
}

.divider::before {
    margin-right: 10px;
}

.divider::after {
    margin-left: 10px;
}

.social-login {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
}

.social-btn {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: white;
    border: 1px solid var(--medium-gray);
    cursor: pointer;
    transition: all 0.3s;
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.social-btn i {
    font-size: 20px;
}

.facebook-btn {
    color: #3b5998;
}

.google-btn {
    color: #db4437;
}

.github-btn {
    color: #333;
}

.register-link {
    text-align: center;
    margin-top: 25px;
    font-size: 15px;
}

.register-link a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.register-link a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.error-message {
    color: var(--error-color);
    font-size: 13px;
    margin-top: 5px;
    display: none;
}

.success-message {
    color: var(--success-color);
    font-size: 14px;
    text-align: center;
    margin-bottom: 20px;
    display: none;
}

.password-toggle {
    position: absolute;
    right: 15px;
    top: 40px;
    cursor: pointer;
    color: var(--dark-gray);
}

.loading {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

@media (max-width: 480px) {
    .login-container {
        padding: 30px 20px;
    }
    
    .login-container h2 {
        font-size: 24px;
    }
}