/* static/css/auth.css - Enhanced Version */

/* Background with modern gradient and animated particles */
.auth-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 85vh;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.auth-wrapper::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 119, 198, 0.2) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(10deg); }
}

/* Modern glassmorphism card */
.auth-card {
    position: relative;
    width: 100%;
    padding: 3rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    box-shadow: 
        0 25px 45px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideUp 0.6s ease-out;
    overflow: hidden;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2, #667eea);
    background-size: 200% 100%;
    animation: shimmer 3s linear infinite;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.auth-card.login-card {
    max-width: 480px;
}

.auth-card.signup-card {
    max-width: 700px;
}

/* Typography improvements */
.auth-card-title {
    text-align: center;
    margin-bottom: 0.5rem;
    font-size: 2.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 15px rgba(102, 126, 234, 0.2);
}

.auth-card-subtitle {
    text-align: center;
    color: #6c757d;
    margin-bottom: 3rem;
    font-size: 1.1rem;
    font-weight: 400;
}

/* Enhanced form elements */
.form-group {
    margin-bottom: 2rem;
    position: relative;
}

.form-label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 0.8rem;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-label i {
    color: #667eea;
    font-size: 0.9rem;
}

.form-control-lg {
    padding: 1rem 1.2rem;
    font-size: 1rem;
    border-radius: 12px;
    border: 2px solid #e9ecef;
    background: rgba(255, 255, 255, 0.8);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.form-control-lg:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.15);
    background: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
}

.form-control-lg:hover {
    border-color: #b8c7f0;
    background: rgba(255, 255, 255, 0.9);
}

/* Enhanced button */
.btn-auth {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-auth::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-auth:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
}

.btn-auth:hover::before {
    left: 100%;
}

.btn-auth:active {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

/* Enhanced switch link */
.auth-switch-link {
    text-align: center;
    margin-top: 2.5rem;
    padding: 1.5rem;
    background: rgba(248, 249, 250, 0.8);
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.auth-switch-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
}

.auth-switch-link a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transition: width 0.3s ease;
}

.auth-switch-link a:hover {
    color: #5a6fd8;
    text-decoration: none;
}

.auth-switch-link a:hover::after {
    width: 100%;
}

/* Form validation styles */
.form-control-lg.is-invalid {
    border-color: #e74c3c;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.form-text {
    font-size: 0.85rem;
    color: #6c757d;
    margin-top: 0.5rem;
}

/* Optional field styling */
.text-muted {
    font-size: 0.8rem;
    font-style: italic;
}

/* Responsive improvements */
@media (max-width: 768px) {
    .auth-card {
        padding: 2rem;
        margin: 1rem;
    }
    
    .auth-card-title {
        font-size: 2.2rem;
    }
    
    .auth-card-subtitle {
        font-size: 1rem;
    }
}

/* Loading animation for form submission */
.btn-auth.loading {
    pointer-events: none;
}

.btn-auth.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Additional visual enhancements */
.row .form-group:first-child {
    padding-right: 0.75rem;
}

.row .form-group:last-child {
    padding-left: 0.75rem;
}

@media (max-width: 576px) {
    .row .form-group:first-child,
    .row .form-group:last-child {
        padding-left: 0;
        padding-right: 0;
    }
}