:root {
    --primary-color: #3b82f6;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --light-color: #f8fafc;
    --dark-color: #1e293b;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

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

body {
    background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: #334155;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-container {
    max-width: 450px;
    width: 100%;
    margin: 0 20px;
}

.auth-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    padding: 40px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), #60a5fa);
}

.auth-card:hover {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.auth-card .logo {
    text-align: center;
    margin-bottom: 32px;
}

.auth-card .logo i {
    font-size: 56px;
    color: var(--primary-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100px;
    height: 100px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 50%;
    margin-bottom: 20px;
    transition: var(--transition);
}

.auth-card .logo i:hover {
    transform: scale(1.1);
    background: rgba(59, 130, 246, 0.2);
}

.auth-card .logo h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--dark-color);
    margin: 0;
}

.auth-card .logo p {
    color: var(--secondary-color);
    font-size: 14px;
    margin-top: 8px;
}

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-color);
    font-size: 14px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 14px;
    transition: var(--transition);
    outline: none;
    background: #f8fafc;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    background: white;
}

.btn {
    border-radius: 6px;
    font-weight: 500;
    padding: 12px 24px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    font-size: 14px;
}

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

.btn-primary:hover {
    background-color: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

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

.btn-secondary:hover {
    background-color: #475569;
}

.alert {
    padding: 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    border-left: 4px solid;
}

.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    border-left-color: var(--success-color);
    color: #059669;
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    border-left-color: var(--danger-color);
    color: #dc2626;
}

.alert-info {
    background-color: rgba(59, 130, 246, 0.1);
    border-left-color: var(--primary-color);
    color: #2563eb;
}

.password-toggle {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--secondary-color);
    transition: var(--transition);
}

.password-toggle:hover {
    color: var(--primary-color);
}

.password-wrapper {
    position: relative;
}

.password-wrapper input {
    padding-right: 45px;
}

.form-text {
    font-size: 12px;
    color: var(--secondary-color);
    margin-top: 4px;
}

.divider {
    display: flex;
    align-items: center;
    margin: 24px 0;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid #e2e8f0;
}

.divider span {
    padding: 0 15px;
    color: var(--secondary-color);
    font-size: 14px;
    font-weight: 500;
}

.social-login {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 24px;
}

.social-login .btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    padding: 0;
    font-size: 18px;
    background: #f8fafc;
    color: var(--secondary-color);
    border: 1px solid #e2e8f0;
}

.social-login .btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.auth-links {
    text-align: center;
    margin-top: 24px;
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.auth-links a:hover {
    text-decoration: underline;
    color: #2563eb;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group-text {
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    border-right: none;
    padding: 12px 16px;
    border-radius: 6px 0 0 6px;
    color: var(--secondary-color);
}

.input-group .form-control {
    border-left: none;
    border-radius: 0 6px 6px 0;
}

.input-group .form-control:focus {
    border-left: none;
}

.is-invalid {
    border-color: var(--danger-color) !important;
}

.is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1) !important;
}

.invalid-feedback {
    display: block;
    color: var(--danger-color);
    font-size: 12px;
    margin-top: 4px;
}

@media (max-width: 576px) {
    .auth-container {
        margin: 20px;
    }
    
    .auth-card {
        padding: 32px 24px;
    }
    
    .auth-card .logo i {
        width: 80px;
        height: 80px;
        font-size: 40px;
    }
    
    .auth-card .logo h1 {
        font-size: 20px;
    }
}