/* --- Modal Design Redesign --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    position: relative;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
    transform: translateY(20px);
    transition: all 0.3s ease;
    border-radius: 0; /* Sharp edges */
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--primary-color);
}

/* Auth Tabs */
.auth-tabs {
    display: flex;
    margin-bottom: 2rem;
    border-bottom: 1px solid #334155;
}

.auth-tab {
    flex: 1;
    text-align: center;
    padding: 1rem;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-muted);
    transition: var(--transition);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.auth-tab.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    background: linear-gradient(to top, rgba(59, 130, 246, 0.1), transparent);
}

/* Forms */
.auth-form {
    display: none;
    animation: fadeIn 0.3s ease;
}

.auth-form.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-input-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.modal-input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.modal-input-group input {
    width: 100%;
    padding: 12px 15px;
    background: var(--bg-input);
    border: 1px solid #334155;
    color: white;
    font-size: 1rem;
    transition: var(--transition);
    border-radius: 0;
}

.modal-input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 1px var(--primary-color);
}

.auth-message {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
    min-height: 20px;
}

.auth-message.error {
    color: #ef4444;
}

.auth-message.success {
    color: #10b981;
}

/* Custom Checkbox (optional if needed later) */
.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}