/**
 * Login-Interface CSS
 * Modernes, responsives Design für die Anmeldung
 */

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

/* Animierter Hintergrund */
.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%);
    animation: backgroundMove 20s ease-in-out infinite;
}

@keyframes backgroundMove {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Login-Card */
.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: none;
    border-radius: 20px;
    box-shadow: 0 25px 45px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 100%;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

/* Login-Header */
.login-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 2rem 1rem;
    text-align: center;
    position: relative;
}

.login-header::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 100" fill="rgba(255,255,255,0.1)"><polygon points="0,0 1000,0 1000,100 0,80"/></svg>');
    background-repeat: repeat-x;
    background-position: bottom;
}

.login-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 2rem;
    transition: transform 0.3s ease;
}

.login-icon:hover {
    transform: scale(1.1);
}

/* Login-Body */
.login-body {
    padding: 2rem;
}

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

.form-floating input {
    border: 2px solid #e9ecef;
    border-radius: 12px;
    transition: all 0.3s ease;
    background: #f8f9fa;
    font-size: 1rem;
    padding: 1rem 0.75rem;
}

.form-floating input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.25rem rgba(102, 126, 234, 0.15);
    background: white;
}

.form-floating input:valid {
    border-color: #28a745;
}

.form-floating input.is-invalid {
    border-color: #dc3545;
}

.form-floating label {
    color: #6c757d;
    font-weight: 500;
}

/* Password Toggle */
.password-toggle {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #6c757d;
    cursor: pointer;
    z-index: 5;
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.password-toggle:hover {
    color: #667eea;
}

/* Remember Me */
.remember-me {
    display: flex;
    align-items: center;
    margin-bottom: 1.5rem;
}

.form-check-input {
    border-radius: 6px;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.form-check-input:checked {
    background-color: #667eea;
    border-color: #667eea;
}

.form-check-label {
    font-weight: 500;
    color: #495057;
    cursor: pointer;
}

/* Login-Button */
.btn-login {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 12px;
    padding: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    font-size: 1rem;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
    background: linear-gradient(135deg, #5a6fd8 0%, #6b4190 100%);
}

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

.btn-login:disabled {
    opacity: 0.8;
    transform: none;
    cursor: not-allowed;
}

.btn-login .spinner-border {
    width: 1rem;
    height: 1rem;
}

/* Alert-Styles */
.alert {
    border-radius: 12px;
    border: none;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.alert-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a52 100%);
    color: white;
}

.alert-success {
    background: linear-gradient(135deg, #51cf66 0%, #40c057 100%);
    color: white;
}

.btn-close-white {
    filter: brightness(0) invert(1);
}

/* Login-Footer */
.login-footer {
    text-align: center;
    padding: 1rem 2rem;
    background: #f8f9fa;
    border-top: 1px solid #e9ecef;
}

.system-info {
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 1rem;
}

/* Loading-Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 10;
    border-radius: 20px;
}

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

/* Validierungs-Feedback */
.invalid-feedback {
    display: block;
    width: 100%;
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: #dc3545;
    font-weight: 500;
}

/* Animationen */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

.login-card {
    animation: fadeInUp 0.6s ease-out;
}

.form-floating:nth-child(1) {
    animation: slideInLeft 0.6s ease-out 0.1s both;
}

.form-floating:nth-child(2) {
    animation: slideInRight 0.6s ease-out 0.2s both;
}

.remember-me {
    animation: slideInLeft 0.6s ease-out 0.3s both;
}

.btn-login {
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

/* Responsive Design */
@media (max-width: 576px) {
    .login-container {
        padding: 0.5rem;
    }
    
    .login-body {
        padding: 1.5rem;
    }
    
    .login-header {
        padding: 1.5rem 1.5rem 1rem;
    }
    
    .login-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
    
    .login-card {
        margin: 0.5rem;
    }
}

@media (max-width: 320px) {
    .login-body {
        padding: 1rem;
    }
    
    .login-header {
        padding: 1rem;
    }
}

/* Dark Mode Support (für zukünftige Erweiterung) */
@media (prefers-color-scheme: dark) {
    .login-card {
        background: rgba(33, 37, 41, 0.95);
        color: #ffffff;
    }
    
    .form-floating input {
        background: rgba(255, 255, 255, 0.1);
        color: #ffffff;
        border-color: rgba(255, 255, 255, 0.3);
    }
    
    .form-floating input:focus {
        background: rgba(255, 255, 255, 0.15);
        border-color: #667eea;
    }
    
    .form-floating label {
        color: rgba(255, 255, 255, 0.7);
    }
    
    .login-footer {
        background: rgba(33, 37, 41, 0.8);
        border-top-color: rgba(255, 255, 255, 0.1);
    }
    
    .system-info {
        color: rgba(255, 255, 255, 0.6);
    }
}

/* High Contrast Support */
@media (prefers-contrast: high) {
    .login-card {
        border: 2px solid #000000;
    }
    
    .form-floating input {
        border-width: 3px;
    }
    
    .btn-login {
        border: 2px solid #000000;
    }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
    .login-card,
    .form-floating,
    .remember-me,
    .btn-login,
    .login-icon,
    .password-toggle,
    .loading-overlay {
        animation: none;
        transition: none;
    }
    
    .btn-login:hover {
        transform: none;
    }
}