/* Navigation (Sticker Rail/Tabs) */
.nav-tabs {
    display: flex;
    background: #fff;
    padding: 0.5rem;
    border-radius: 16px;
    border: 3px solid var(--border-strong);
    box-shadow: var(--shadow-sm);
    margin-bottom: 3rem;
    position: relative;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-family: var(--font-heading);
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color 0.3s ease;
    position: relative;
    z-index: 2;
}

.tab-btn:hover {
    color: var(--text-primary);
}

.tab-btn.active {
    color: var(--text-primary);
}

/* The Cute Sliding Indicator */
.nav-indicator {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    /* Initial, JS will update */
    height: calc(100% - 1rem);
    background: var(--bg-surface);
    border-radius: 12px;
    z-index: 1;
    transition:
        left 0.4s var(--easing-organic),
        width 0.4s var(--easing-organic);
    border: 3px solid var(--border-strong);
}