:root {
    --primary: #4361ee;
    --primary-dark: #3a56d4;
    --secondary: #7209b7;
    --success: #4cc9f0;
    --warning: #f8961e;
    --danger: #e63946;
    --light: #f8f9fa;
    --dark: #212529;
    --gray: #6c757d;
    --border: #e2e8f0;
    --shadow: 0 10px 25px rgba(0,0,0,0.05);
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.login-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
    animation: slideUp 0.6s ease-out;
}

.login-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    padding: 2rem;
    text-align: center;
}

.login-header img {
    height: 50px;
    margin-bottom: 1rem;
}

.login-header h1 {
    font-weight: 700;
    margin: 0;
    font-size: 1.5rem;
}

.login-body {
    padding: 2rem;
}

.form-modern .form-control {
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 0.75rem 1rem;
    transition: var(--transition);
    font-size: 0.9rem;
}

.form-modern .form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(67, 97, 238, 0.1);
}

.form-floating > label {
    color: var(--gray) !important;
}

.btn-login {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border: none;
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    width: 100%;
    margin: 1rem 0;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.3);
    color: white;
}

.btn-register {
    background: var(--light);
    border: 2px solid var(--border);
    color: var(--dark);
    padding: 0.75rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    width: 100%;
    text-decoration: none;
    display: block;
    text-align: center;
}

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

.login-links {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--gray);
}

.login-links a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.login-links a:hover {
    text-decoration: underline;
}

.alert-modern {
    border-radius: 12px;
    border: none;
    padding: 1rem;
    margin-bottom: 1rem;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Адаптивность */
@media (max-width: 480px) {
    .login-container {
        padding: 1rem;
    }
    
    .login-header {
        padding: 1.5rem 1rem;
    }
    
    .login-body {
        padding: 1.5rem 1rem;
    }
}