:root {
  --bg: #0b0d14; --bg2: #11141f; --panel: rgba(22, 26, 40, 0.78); --line: rgba(255,255,255,0.08);
  --fg: #e9ecf5; --muted: #8b93ad; --accent: #7cc4ff; --radius: 18px;
  --seg-a: 50vh; --hinge: 0px; --seg-b: 50vh;
  --sat: env(safe-area-inset-top, 0px); --sab: env(safe-area-inset-bottom, 0px);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg); font: 14px/1.4 -apple-system, system-ui, "SF Pro Text", sans-serif; overscroll-behavior: none; overflow: hidden; }
body { touch-action: none; }
button, input { font: inherit; color: inherit; }

.app { position: fixed; inset: 0; display: grid; transition: grid-template-rows .45s cubic-bezier(.2,.8,.2,1), grid-template-columns .45s cubic-bezier(.2,.8,.2,1); }
.pane { position: relative; min-width: 0; min-height: 0; }
.pane-graph { background: radial-gradient(120% 90% at 50% 40%, #151a2b 0%, var(--bg) 70%); overflow: hidden; }
canvas { display: block; position: absolute; inset: 0; }
.hinge { background: transparent; position: relative; }
body.hinge-shadow .hinge::before { content: ""; position: absolute; inset: 0; background: linear-gradient(to bottom, rgba(0,0,0,.0), rgba(0,0,0,.55) 50%, rgba(0,0,0,0)); }
body[data-posture="book"].hinge-shadow .hinge::before { background: linear-gradient(to right, rgba(0,0,0,.0), rgba(0,0,0,.55) 50%, rgba(0,0,0,0)); }

.topbar { position: absolute; top: calc(var(--sat) + 10px); left: 14px; right: 14px; display: flex; justify-content: space-between; align-items: center; pointer-events: none; }
.brand { font-weight: 600; letter-spacing: .2px; display: flex; gap: 8px; align-items: center; text-shadow: 0 1px 8px rgba(0,0,0,.6); }
.brand .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.meta { display: flex; gap: 6px; }
.badge { font-size: 11px; padding: 3px 8px; border-radius: 999px; background: rgba(255,255,255,.1); backdrop-filter: blur(8px); text-transform: uppercase; letter-spacing: .6px; }
.badge.subtle { text-transform: none; letter-spacing: 0; color: var(--muted); }
.hint { position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); font-size: 12px; color: var(--muted); background: rgba(0,0,0,.35); padding: 6px 12px; border-radius: 999px; backdrop-filter: blur(8px); pointer-events: none; white-space: nowrap; transition: opacity .4s; }
.hint b { color: var(--fg); font-weight: 600; }
.toast { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%) scale(.9); font-size: 20px; font-weight: 600; letter-spacing: .3px; padding: 12px 22px; border-radius: 999px; background: rgba(255,255,255,.1); backdrop-filter: blur(16px); animation: toast 1.8s cubic-bezier(.2,.8,.2,1) forwards; pointer-events: none; }
@keyframes toast { 0% { opacity: 0; transform: translate(-50%,-50%) scale(.8);} 15% { opacity: 1; transform: translate(-50%,-50%) scale(1);} 80% { opacity: 1;} 100% { opacity: 0; transform: translate(-50%,-50%) scale(1.05);} }

/* Deck */
.pane-deck { background: linear-gradient(180deg, #161a28, #0f121c); border-top: 1px solid var(--line); display: flex; flex-direction: column; }
.deck-grab { display: none; justify-content: center; padding: 8px 0 2px; }
.deck-grab span { width: 44px; height: 5px; border-radius: 3px; background: rgba(255,255,255,.25); }
.deck-scroll { flex: 1; min-height: 0; overflow: auto; padding: 14px 14px calc(var(--sab) + 14px); display: flex; flex-direction: column; gap: 12px; -webkit-overflow-scrolling: touch; touch-action: pan-y; }
.deck-row { display: flex; gap: 12px; }
.deck-primary { align-items: stretch; }
.trackpad { flex: 1.1; min-height: 140px; border-radius: var(--radius); background: linear-gradient(160deg, #1d2234, #141826); border: 1px solid var(--line); position: relative; display: flex; flex-direction: column; justify-content: flex-end; padding: 12px 14px; touch-action: none; user-select: none; -webkit-user-select: none; box-shadow: inset 0 1px 0 rgba(255,255,255,.05), 0 10px 30px rgba(0,0,0,.35); overflow: hidden; }
.trackpad:active { background: linear-gradient(160deg, #222841, #171c2c); }
.tp-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1.2px; color: var(--muted); }
.tp-sub { font-size: 12px; color: var(--muted); opacity: .7; }
.tp-glow { position: absolute; width: 90px; height: 90px; border-radius: 50%; background: radial-gradient(circle, rgba(124,196,255,.35), rgba(124,196,255,0) 70%); transform: translate(-50%,-50%); opacity: 0; pointer-events: none; transition: opacity .3s; }
.slider-block { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 8px; padding: 12px 14px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }
.lab { display: flex; justify-content: space-between; font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.lab output { color: var(--fg); font-variant-numeric: tabular-nums; }
.lab.small { text-transform: none; letter-spacing: 0; margin-top: 4px; }
.scale { display: flex; justify-content: space-between; font-size: 11px; color: var(--muted); }
input[type=range] { -webkit-appearance: none; appearance: none; width: 100%; height: 28px; background: transparent; margin: 0; }
input[type=range]::-webkit-slider-runnable-track { height: 8px; border-radius: 4px; background: linear-gradient(90deg, #f28c5e, #7cc4ff, #c58ef5); opacity: .9; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 26px; height: 26px; border-radius: 50%; background: #fff; margin-top: -9px; box-shadow: 0 2px 10px rgba(0,0,0,.5), 0 0 0 4px rgba(255,255,255,.12); }
.big-slider { height: 44px; }
.big-slider::-webkit-slider-runnable-track { height: 14px; border-radius: 7px; }
.big-slider::-webkit-slider-thumb { width: 38px; height: 38px; margin-top: -12px; }
.physics input[type=range]::-webkit-slider-runnable-track { background: rgba(255,255,255,.18); }

.chips { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 2px; scrollbar-width: none; touch-action: pan-x; }
.chips::-webkit-scrollbar { display: none; }
.chip { flex: none; display: flex; align-items: center; gap: 7px; padding: 9px 13px; border-radius: 999px; background: rgba(255,255,255,.07); border: 1px solid var(--line); font-size: 13px; cursor: pointer; transition: background .2s, transform .15s; }
.chip:active { transform: scale(.96); }
.chip .sw { width: 10px; height: 10px; border-radius: 50%; }
.chip.focus { background: rgba(255,255,255,.16); }
.chip.isolate { background: rgba(255,255,255,.26); outline: 2px solid var(--c); outline-offset: -1px; }
.chip .n { color: var(--muted); font-size: 11px; }

.card { padding: 12px 14px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); flex: 1; min-width: 0; }
.card-title { font-weight: 600; margin-bottom: 4px; }
.card-sub { color: var(--muted); font-size: 12px; }
.detail .pill { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 999px; background: rgba(255,255,255,.1); margin-right: 6px; }
.detail .nb { display: flex; justify-content: space-between; font-size: 12px; padding: 3px 0; border-top: 1px solid var(--line); }
.detail .nb span:last-child { color: var(--muted); font-variant-numeric: tabular-nums; }
.bridge-bar { height: 6px; border-radius: 3px; background: rgba(255,255,255,.1); margin-top: 6px; overflow: hidden; }
.bridge-bar i { display: block; height: 100%; background: linear-gradient(90deg, #7cc4ff, #f26e9a); }
.btn-row { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.btn { padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line); background: rgba(255,255,255,.08); cursor: pointer; }
.btn.on { background: var(--accent); color: #06121f; border-color: transparent; }
.caps { font-size: 11px; color: var(--muted); opacity: .8; }

/* Quick actions */
.qa-btn { position: fixed; top: calc(var(--sat) + 8px); left: 50%; transform: translateX(-50%); height: 28px; padding: 0 12px; font-size: 11px; letter-spacing: .4px; border-radius: 999px; border: 1px solid var(--line); background: rgba(20,24,38,.7); backdrop-filter: blur(10px); color: var(--muted); cursor: pointer; z-index: 50; }
.qa { position: fixed; left: 50%; transform: translateX(-50%); top: calc(var(--sat) + 44px); width: 280px; padding: 12px; border-radius: 16px; background: rgba(20,24,38,.92); backdrop-filter: blur(20px); border: 1px solid var(--line); z-index: 50; box-shadow: 0 20px 60px rgba(0,0,0,.5); }
.qa-title { font-weight: 600; margin-bottom: 8px; display: flex; justify-content: space-between; }
.qa-title small { color: var(--muted); font-weight: 400; }
.qa-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.qa-grid button { padding: 9px 10px; border-radius: 10px; border: 1px solid var(--line); background: rgba(255,255,255,.07); cursor: pointer; text-align: left; font-size: 13px; }
.qa-grid button.on { background: rgba(124,196,255,.25); border-color: var(--accent); }
.qa-foot { margin-top: 8px; font-size: 11px; color: var(--muted); }

/* ---------- Layouts ---------- */
/* LAPTOP: horizontal fold, graph top, deck bottom. Segment heights from JS vars or env(). */
body[data-posture="laptop"] .app { grid-template-rows: var(--seg-a) var(--hinge) var(--seg-b); grid-template-columns: 1fr; }
@supports (height: env(viewport-segment-height 0 0)) {
  body[data-posture="laptop"][data-source^="media"] .app { grid-template-rows: env(viewport-segment-height 0 0) calc(env(viewport-segment-top 0 1) - env(viewport-segment-bottom 0 0)) env(viewport-segment-height 0 1); }
}
body[data-posture="laptop"] .pane-deck { border-top: none; border-radius: 0; }
body[data-posture="laptop"] .deck-scroll { padding-top: 16px; }

/* BOOK: vertical fold, graph left, controls right. */
body[data-posture="book"] .app { grid-template-columns: var(--seg-a) var(--hinge) var(--seg-b); grid-template-rows: 1fr; }
@supports (width: env(viewport-segment-width 0 0)) {
  body[data-posture="book"][data-source^="media"] .app { grid-template-columns: env(viewport-segment-width 0 0) calc(env(viewport-segment-left 1 0) - env(viewport-segment-right 0 0)) env(viewport-segment-width 1 0); }
}
body[data-posture="book"] .pane-deck { border-top: none; border-left: 1px solid var(--line); }
body[data-posture="book"] .deck-primary { flex-direction: column; }
body[data-posture="book"] .deck-secondary { flex-direction: column; }
body[data-posture="book"] .trackpad { min-height: 160px; }

/* FLAT: graph fills, deck becomes a translucent collapsible drawer. */
body[data-posture="flat"] .app { grid-template-rows: 1fr; grid-template-columns: 1fr; }
body[data-posture="flat"] .hinge { display: none; }
body[data-posture="flat"] .pane-deck { position: absolute; right: 16px; bottom: calc(var(--sab) + 16px); width: min(420px, calc(100vw - 32px)); max-height: calc(100% - 90px); border-radius: 22px; border: 1px solid var(--line); background: rgba(16,19,30,.72); backdrop-filter: blur(24px) saturate(140%); -webkit-backdrop-filter: blur(24px) saturate(140%); box-shadow: 0 30px 80px rgba(0,0,0,.5); transition: transform .4s cubic-bezier(.2,.8,.2,1), max-height .4s; }
body[data-posture="flat"] .deck-grab { display: flex; cursor: pointer; }
body[data-posture="flat"] .deck-primary, body[data-posture="flat"] .deck-secondary { flex-direction: column; }
body[data-posture="flat"] .trackpad { min-height: 110px; }
body[data-posture="flat"].deck-collapsed .pane-deck { max-height: 150px; }
body[data-posture="flat"].deck-collapsed .deck-secondary, body[data-posture="flat"].deck-collapsed .trackpad, body[data-posture="flat"].deck-collapsed .caps, body[data-posture="flat"].deck-collapsed .chips-row { display: none; }

/* CLOSED: outer screen, compact bottom sheet. */
body[data-posture="closed"] .app { grid-template-rows: 1fr auto; grid-template-columns: 1fr; }
body[data-posture="closed"] .hinge { display: none; }
body[data-posture="closed"] .pane-deck { border-radius: 22px 22px 0 0; max-height: 46vh; transition: max-height .4s cubic-bezier(.2,.8,.2,1); }
body[data-posture="closed"] .deck-grab { display: flex; cursor: pointer; }
body[data-posture="closed"] .deck-scroll { padding-top: 6px; gap: 10px; }
body[data-posture="closed"] .trackpad { display: none; }
body[data-posture="closed"] .deck-secondary { flex-direction: column; }
body[data-posture="closed"] .caps { display: none; }
body[data-posture="closed"].deck-collapsed .pane-deck { max-height: 120px; }
body[data-posture="closed"].deck-collapsed .deck-secondary, body[data-posture="closed"].deck-collapsed .chips-row { display: none; }
body[data-posture="closed"] .hint { bottom: 12px; }
body:not([data-posture="closed"]) .hint b { display: none; }

@media (prefers-reduced-motion: reduce) { .app, .pane-deck { transition: none !important; } }