/* Authentication Modal */
.auth-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.auth-modal.active {
    opacity: 1;
    visibility: visible;
}

.auth-modal-content {
    background: var(--bg-secondary);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 420px;
    min-width: 320px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: scale(0.95) translateY(20px);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.auth-modal.active .auth-modal-content {
    transform: scale(1) translateY(0);
}

.auth-header {
    padding: 2rem 2rem 1rem;
    text-align: center;
    position: relative;
    border-bottom: 1px solid var(--border-color);
}

.auth-header h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
}

.auth-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    padding: 0.5rem;
    border-radius: 0.25rem;
}

.auth-close:hover,
.auth-close:focus {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.1);
    outline: none;
}

.auth-body {
    padding: 2rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: opacity 0.2s ease-in-out;
}

.auth-form.hidden {
    display: none;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0 0 0.5rem;
    text-align: center;
    line-height: 1.4;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input {
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input.invalid {
    border-color: #ef4444;
}

.form-group input:focus.invalid {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.error-message {
    font-size: 0.75rem;
    color: #ef4444;
    display: none;
    margin-top: 0.25rem;
}

.forgot-password {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.875rem;
    text-align: right;
    margin: -0.25rem 0 0.5rem;
    transition: color 0.2s;
}

.forgot-password:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.auth-submit {
    padding: 1rem;
    background: var(--gradient);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 0.25rem;
}

.auth-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

.auth-submit:active {
    transform: translateY(0);
}

.auth-switch {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
}

.switch-btn {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    font-size: inherit;
    text-decoration: underline;
    margin-left: 0.25rem;
    transition: color 0.2s;
}

.switch-btn:hover {
    color: var(--primary-dark);
}

/* Responsive Design */
@media (max-width: 768px) {
    .auth-modal-content {
        width: 95%;
        margin: 1rem;
        min-width: 280px;
    }
    
    .auth-header {
        padding: 1.5rem 1.5rem 1rem;
    }
    
    .auth-body {
        padding: 1.5rem;
    }
}