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01/06

The Problem

Your content is narrow.
Your screen is wide.

Traditional layouts waste the flanks or stuff every control into a single scrolling column. DCS turns ambient whitespace into two independent UI surfaces — navigation on the left, controls on the right — without stealing pixels from the story.

wastedcontentwasted

navcontentcontrols

The Pattern

One sidebar.
Many panels.
Zero clutter.

Each sidebar holds a horizontal carousel of panels. Chevrons and dots cycle through them without leaving the column. Unlimited surfaces, constant footprint — the one you are reading right now sits inside a panel that lives inside a carousel.

Mobile‑First

100% viewport.
Transform‑based.
Buttery smooth.

Below 1280 px, sidebars live off‑screen at full width. A hamburger reveals them via transform — GPU‑accelerated, no reflow, no drawer library. Tap outside to dismiss.

.sidebar {
  transform: translateX(-100%);
  transition: transform 300ms;
}
.sidebar.open {
  transform: translateX(0);
}

Desktop

Pinned.
Persistent.
Asymmetric by default.

At 1280 px+, sidebars pin as columns. Content receives margin‑inline — it reflows cleanly instead of being overlapped. Each side pins independently, so asymmetric layouts fall out for free.

10–100%

user‑adjustable width per side

Motion

Slide for space.
Fade for focus.

Panels transition by sliding (physical — they move past you) or fading (semantic — they dissolve in place). Toggle live from the Appearance panel on the right and watch the difference between a spatial model and a content‑parity one.

slide

fade

Persistence

Pick it up
where you left it.

Theme, scheme, pin state, active panel — all survive reloads via a single localStorage key. An inline pre‑script paints the correct state before the first frame. Zero flash. Zero dependencies. Zero build step.

themedark

schemeocean

pinLefttrue

panelLeft0

carouselslide

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Appearance

my.renta.net

RentaNET customer & billing panel

Your content is narrow.Your screen is wide.

One sidebar.Many panels.Zero clutter.

100% viewport.Transform‑based.Buttery smooth.

Pinned.Persistent.Asymmetric by default.

Slide for space.Fade for focus.