/* Interactive Authentication Styles */
:root {
    --primary-color: #4e73df;
    --primary-dark: #3d5afe;
    --secondary-color: #858796;
    --success-color: #1cc88a;
    --warning-color: #f6c23e;
    --danger-color: #e74a3b;
    --light-color: #f8f9fc;
    --dark-color: #2d3748;
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --border-radius: 0.75rem;
    --transition: all 0.3s ease;
}

/* Background Animation */
.auth-body {
linear-gradient(to right, #ecf9ff, #ddf4ff, #ffffff);
    /* background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); */
    min-height: 100vh;
    position: relative;
    /* overflow: hidden; */
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.auth-body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><polygon fill="rgba(255,255,255,0.1)" points="0,0 1000,300 1000,1000 0,700"/></svg>');
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(2deg); }
}

/* Floating Particles */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.particle {
    position: absolute;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: particle-float 8s infinite ease-in-out;
}

.particle:nth-child(1) {
    width: 4px;
    height: 4px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    width: 6px;
    height: 6px;
    top: 60%;
    left: 20%;
    animation-delay: 2s;
}

.particle:nth-child(3) {
    width: 3px;
    height: 3px;
    top: 40%;
    left: 70%;
    animation-delay: 4s;
}

.particle:nth-child(4) {
    width: 5px;
    height: 5px;
    top: 80%;
    left: 80%;
    animation-delay: 6s;
}

.particle:nth-child(5) {
    width: 4px;
    height: 4px;
    top: 30%;
    left: 50%;
    animation-delay: 1s;
}

@keyframes particle-float {
    0%, 100% {
        transform: translateY(0px) translateX(0px);
        opacity: 0.3;
    }
    50% {
        transform: translateY(-30px) translateX(20px);
        opacity: 0.8;
    }
}

/* Auth Container */
.auth-container {
    position: relative;
    z-index: 10;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

/* Auth Card */
.auth-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: var(--transition);
    position: relative;
    max-width: 500px;
    width: 100%;
}

.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
}

.auth-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 2rem 4rem rgba(0, 0, 0, 0.2);
}

/* Auth Header */
.auth-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-align: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.auth-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: shine 3s infinite;
}

@keyframes shine {
    0% { transform: translateX(-100%) translateY(-100%) rotate(45deg); }
    100% { transform: translateX(100%) translateY(100%) rotate(45deg); }
}

.auth-header h4 {
    margin: 0;
    font-size: 1.75rem;
    font-weight: 600;
    position: relative;
    z-index: 2;
}

.auth-header .subtitle {
    margin-top: 0.5rem;
    opacity: 0.9;
    font-size: 0.9rem;
    position: relative;
    z-index: 2;
}

/* Logo Animation */
.auth-logo {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Auth Body */
.auth-body-content {
    padding: 2.5rem 2rem;
}

/* Form Groups */
.form-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark-color);
    transition: var(--transition);
}

/* Interactive Form Controls */
.form-control {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    border: 2px solid #e3e6f0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: #fff;
    position: relative;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.25);
    transform: translateY(-2px);
}

.form-control:valid {
    border-color: var(--success-color);
}

.form-control:invalid:not(:placeholder-shown) {
    border-color: var(--danger-color);
}

/* Input Icons */
.input-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary-color);
    transition: var(--transition);
    z-index: 5;
}

.form-control:focus + .input-icon {
    color: var(--primary-color);
    transform: translateY(-50%) scale(1.1);
}

/* Floating Labels */
.floating-label {
    position: relative;
}

.floating-label .form-control {
    padding-top: 1.5rem;
    padding-bottom: 0.5rem;
}

.floating-label .form-label {
    position: absolute;
    top: 1rem;
    left: 3rem;
    font-size: 1rem;
    color: var(--secondary-color);
    transition: var(--transition);
    pointer-events: none;
    margin-bottom: 0;
}

.floating-label .form-control:focus ~ .form-label,
.floating-label .form-control:not(:placeholder-shown) ~ .form-label {
    top: 0.25rem;
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
}

/* Buttons */
.btn-auth {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0.5rem 1rem rgba(78, 115, 223, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Button Loading Animation */
.btn-loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    margin: auto;
    border: 2px solid transparent;
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Alerts */
.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem;
    margin-bottom: 1.5rem;
    animation: slideIn 0.3s ease;
    position: relative;
    overflow: hidden;
}

.alert::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: currentColor;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-success {
    background: rgba(28, 200, 138, 0.1);
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background: rgba(231, 74, 59, 0.1);
    color: var(--danger-color);
    border-left: 4px solid var(--danger-color);
}

/* Links */
.auth-links {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e3e6f0;
}

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

.auth-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -2px;
    left: 50%;
    background: var(--primary-color);
    transition: var(--transition);
}

.auth-links a:hover {
    color: var(--primary-dark);
}

.auth-links a:hover::after {
    width: 100%;
    left: 0;
}

/* Password Strength Indicator */
.password-strength {
    height: 4px;
    background: #e3e6f0;
    border-radius: 2px;
    margin-top: 0.5rem;
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    border-radius: 2px;
    transition: var(--transition);
    width: 0%;
}

.strength-weak { background: var(--danger-color); }
.strength-fair { background: var(--warning-color); }
.strength-good { background: var(--success-color); }
.strength-strong { background: var(--primary-color); }

/* Custom Checkbox */
.custom-checkbox {
    position: relative;
    display: flex;
    align-items: center;
    margin: 1rem 0;
}

.custom-checkbox input[type="checkbox"] {
    opacity: 0;
    position: absolute;
}

.custom-checkbox .checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--secondary-color);
    border-radius: 4px;
    margin-right: 0.75rem;
    position: relative;
    transition: var(--transition);
}

.custom-checkbox input:checked ~ .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.custom-checkbox .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    color: white;
    font-weight: bold;
    transition: var(--transition);
}

.custom-checkbox input:checked ~ .checkmark::after {
    transform: translate(-50%, -50%) scale(1);
}

/* Form Validation */
.was-validated .form-control:valid {
    border-color: var(--success-color);
    padding-right: 3rem;
}

.was-validated .form-control:invalid {
    border-color: var(--danger-color);
    padding-right: 3rem;
}

.valid-feedback,
.invalid-feedback {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.valid-feedback {
    color: var(--success-color);
}

.invalid-feedback {
    color: var(--danger-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .auth-container {
        padding: 1rem;
    }
    
    .auth-card {
        margin: 0;
    }
    
    .auth-body-content {
        padding: 2rem 1.5rem;
    }
    
    .auth-header {
        padding: 1.5rem;
    }
    
    .auth-header h4 {
        font-size: 1.5rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .auth-card {
        background: rgba(45, 55, 72, 0.95);
        color: white;
    }
    
    .form-control {
        background: rgba(255, 255, 255, 0.1);
        border-color: rgba(255, 255, 255, 0.2);
        color: white;
    }
    
    .form-control::placeholder {
        color: rgba(255, 255, 255, 0.6);
    }
    
    .form-label {
        color: rgba(255, 255, 255, 0.9);
    }
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.loading-overlay.show {
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}