/* The [hidden] attribute must win over class display rules (e.g. .sbc-prompt's
   display:flex), otherwise hidden-by-default panels stay visible. */
[hidden] { display: none !important; }

/* ---- layout ---- */
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; }
.sbc-layout {
  display: grid;
  grid-template-columns: 200px 1fr 240px;
  grid-template-rows: auto 1fr 1fr;
  height: 100vh;
  overflow: hidden;
}
.sbc-header       { grid-column: 1 / -1; grid-row: 1; }
.sbc-sidebar      { grid-column: 1;      grid-row: 2 / 4; }
.sbc-canvas       { grid-column: 2;      grid-row: 2; }
.sbc-control-path { grid-column: 2;      grid-row: 3; }
.sbc-results      { grid-column: 3;      grid-row: 2 / 4; }
.sbc-header {
  grid-column: 1 / -1;
  padding: .7rem 1.2rem;
  border-bottom: 1px solid rgba(128,128,128,.2);
  display: flex; align-items: center; gap: 1rem;
  flex-wrap: wrap;
}
.sbc-header h1 { font-size: 1.1rem; margin: 0; }
.sbc-status {
  margin-left: auto; font-size: .75rem; opacity: .55;
  font-style: italic;
}

/* ---- sidebar ---- */
.sbc-sidebar {
  border-right: 1px solid rgba(128,128,128,.2);
  padding: .8rem;
  overflow-y: auto;
  min-height: 0;   /* let this grid item scroll internally instead of inflating the grid past 100vh */
  display: flex; flex-direction: column; gap: 1.2rem;
}
.sbc-sidebar h3 {
  font-size: .7rem; text-transform: uppercase; letter-spacing: .08em;
  opacity: .55; margin: 0 0 .4rem;
}
.sbc-chips { display: flex; flex-wrap: wrap; gap: .4rem; }
.sbc-chip {
  padding: .35rem .6rem; border-radius: 6px; font-size: .78rem; font-weight: 600;
  cursor: grab; user-select: none;
  border: 1px solid rgba(128,128,128,.35);
  background: rgba(128,128,128,.1);
  transition: background .15s;
}
.sbc-chip:hover { background: rgba(128,128,128,.22); }
.sbc-chip[data-drag="disk"]         { border-color: rgba(52,152,219,.5);  background: rgba(52,152,219,.12); }
.sbc-chip[data-drag="segmentation"] { border-color: rgba(155,89,182,.5);  background: rgba(155,89,182,.12); }
.sbc-chip[data-drag="redundancy"]   { border-color: rgba(46,204,113,.5);  background: rgba(46,204,113,.12); }

/* ---- canvas area ---- */
/* Layer labels via ::before so render() clearing innerHTML doesn't remove them */
.sbc-canvas, .sbc-physical { position: relative; }
.sbc-canvas::before, .sbc-physical::before {
  position: absolute; top: .5rem; right: .7rem;
  font-size: .62rem; text-transform: uppercase; letter-spacing: .09em;
  opacity: .35; pointer-events: none; z-index: 1;
}
.sbc-canvas::before   { content: 'data layer'; }
.sbc-physical::before { content: 'physical layer'; }

.sbc-canvas {
  margin: .6rem .6rem .3rem .6rem;
  border: 2px dashed rgba(128,128,128,.3);
  border-radius: 10px;
  padding: 1.2rem;
  overflow: auto;
  min-height: 0;   /* grid item: scroll its own content, don't inflate the grid */
  display: flex; flex-wrap: wrap; gap: 1rem; align-content: flex-start;
  background: repeating-linear-gradient(
    0deg, transparent, transparent 31px,
    rgba(128,128,128,.06) 31px, rgba(128,128,128,.06) 32px
  ),
  repeating-linear-gradient(
    90deg, transparent, transparent 31px,
    rgba(128,128,128,.06) 31px, rgba(128,128,128,.06) 32px
  );
}
.sbc-canvas.sbc--over        { border-color: rgba(52,152,219,.6); }
.sbc-control-path.cp--active { border-color: rgba(52,152,219,.6); }

/* ---- canvas nodes ---- */
.sbc-disk {
  position: relative;
  padding: .5rem 1.6rem .5rem .75rem; border-radius: 8px; font-size: .8rem; font-weight: 600;
  cursor: grab; user-select: none;
  background: rgba(52,152,219,.18); border: 1px solid rgba(52,152,219,.45);
  transition: background .12s, box-shadow .12s;
  white-space: nowrap;
}
.sbc-disk:hover  { background: rgba(52,152,219,.28); }
.sbc-disk.sbc--over { box-shadow: 0 0 0 2px rgba(52,152,219,.8); }

.sbc-array {
  position: relative;
  border: 2px solid rgba(155,89,182,.5); border-radius: 10px;
  padding: .6rem; padding-top: 1.4rem; min-width: 140px;
  background: rgba(155,89,182,.07);
  display: flex; flex-direction: column; gap: .5rem;
}
.sbc-array.sbc--over { border-color: rgba(155,89,182,.9); background: rgba(155,89,182,.14); }

/* Delete / dissolve button — visible on hover */
.sbc-delete {
  position: absolute; top: 4px; right: 4px;
  width: 18px; height: 18px; line-height: 18px;
  font-size: .75rem; text-align: center;
  border-radius: 50%; border: none; cursor: pointer;
  background: rgba(231,76,60,.7); color: #fff;
  opacity: 0; transition: opacity .15s; padding: 0;
}
.sbc-disk:hover  > .sbc-delete,
.sbc-array:hover > .sbc-delete { opacity: 1; }

/* Inline variant for slot clear buttons */
.sbc-delete--inline {
  position: static; display: inline-block;
  width: 14px; height: 14px; line-height: 14px; font-size: .65rem;
  margin-left: .25rem; vertical-align: middle;
  opacity: 0;
}
.sbc-slot--filled:hover .sbc-delete--inline { opacity: 1; }

.sbc-slots { display: flex; gap: .4rem; }
.sbc-slot {
  flex: 1; padding: .3rem .5rem; border-radius: 6px;
  font-size: .72rem; font-weight: 600; text-align: center;
  transition: background .12s;
}
.sbc-slot--empty {
  border: 1.5px dashed rgba(128,128,128,.4);
  background: rgba(128,128,128,.06);
}
.sbc-slot--empty.sbc-slot--over {
  border-color: rgba(255,255,255,.6); background: rgba(255,255,255,.08);
}
.sbc-slot-hint { opacity: .5; font-style: italic; }
.sbc-slot--filled[data-axis="segmentation"] { background: rgba(155,89,182,.25); border: 1.5px solid rgba(155,89,182,.5); }
.sbc-slot--filled[data-axis="redundancy"]   { background: rgba(46,204,113,.2);  border: 1.5px solid rgba(46,204,113,.45); }
.sbc-slot--filled[data-axis="algorithm"]    { background: rgba(230,126,34,.18); border: 1.5px solid rgba(230,126,34,.5); }
.sbc-slot--empty[data-axis="algorithm"]     { border-color: rgba(230,126,34,.3); }

.sbc-chip[data-drag="algorithm"]  { border-color: rgba(230,126,34,.5);  background: rgba(230,126,34,.12); }
.sbc-chip[data-drag="component"] { border-color: rgba(149,165,166,.5); background: rgba(149,165,166,.12); }

/* ---- physical layer canvas ---- */
.sbc-physical {
  grid-column: 2; grid-row: 3;
  margin: .3rem .6rem .6rem .6rem;
  border: 2px dashed rgba(128,128,128,.3);
  border-radius: 10px;
  background: rgba(0,0,0,.05);
  overflow: hidden;
  min-height: 0;   /* grid item: don't inflate the grid past 100vh */
}
.sbc-physical.cp--active { border-color: rgba(52,152,219,.6); }
/* The collapse toggle is a narrow-screen affordance only; desktop shows the
   physical canvas unconditionally. */
.sbc-physical-toggle, .sbc-canvas-title { display: none; }
/* inner canvas + SVG overlay */
.pln-canvas {
  position: relative; width: 100%; height: 100%;
  min-height: 160px;
}
.pln-svg {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none; overflow: visible;
}
/* component nodes */
.pln-node {
  position: absolute; display: inline-flex; align-items: center; gap: .35rem;
  padding: .4rem .65rem;
  background: rgba(30,30,30,.85);
  border: 1.5px solid var(--node-color, rgba(128,128,128,.5));
  border-radius: 8px; font-size: .78rem; font-weight: 600;
  cursor: grab; user-select: none; white-space: nowrap;
}
/* disk nodes (the shared atom, mirrored from the data view) */
.pln-disk { background: rgba(52,152,219,.22); }
.pln-icon  { font-size: .95rem; line-height: 1; }
.pln-badge {
  font-size: .6rem; padding: .1rem .3rem; border-radius: 4px;
  background: rgba(231,76,60,.3); border: 1px solid rgba(231,76,60,.5);
  color: #e74; font-weight: 700;
}
.pln-delete {
  position: absolute; top: -6px; right: -6px;
  width: 16px; height: 16px; line-height: 16px; text-align: center;
  border-radius: 50%; border: none; cursor: pointer; font-size: .7rem;
  background: rgba(231,76,60,.75); color: #fff;
  opacity: 0; transition: opacity .15s; padding: 0;
}
.pln-node:hover .pln-delete { opacity: 1; }
/* port dots */
.pln-port {
  position: absolute; width: 10px; height: 10px; border-radius: 50%;
  background: rgba(255,255,255,.25); border: 1.5px solid rgba(255,255,255,.4);
  cursor: crosshair; top: 50%; transform: translateY(-50%);
  transition: background .12s, transform .12s;
}
.pln-port--in  { left:  -7px; }
.pln-port--out { right: -7px; cursor: grab; }
.pln-port:hover, .pln-port--over {
  background: rgba(52,152,219,.8); transform: translateY(-50%) scale(1.4);
}

.sbc-members { display: flex; flex-wrap: wrap; gap: .4rem; }

/* ---- results panel ---- */
.sbc-results {
  border-left: 1px solid rgba(128,128,128,.2);
  padding: .8rem;
  overflow-y: auto;
  min-height: 0;   /* see .sbc-sidebar: scroll internally, don't inflate the grid */
  display: flex; flex-direction: column; gap: .8rem;
}
.sbc-results h3 {
  font-size: .7rem; text-transform: uppercase; letter-spacing: .08em;
  opacity: .55; margin: 0 0 .2rem;
}
.sbc-level { font-size: 1.2rem; font-weight: 600; }
.sbc-level--nonstd { color: #e67e22; font-size: .95rem; }
.sbc-stat  { font-size: .88rem; opacity: .8; }
.sbc-issue {
  font-size: .8rem; padding: .5rem .7rem; border-radius: 6px;
  background: rgba(241,196,15,.12); border: 1px solid rgba(241,196,15,.35); color: #f1c40f;
}
.sbc-issue--hard {
  background: rgba(231,76,60,.12); border-color: rgba(231,76,60,.45); color: #e74c3c;
}
.sbc-violations { display: flex; flex-direction: column; gap: .4rem; }

/* ---- prompt mode ---- */
.sbc-mode-select {
  font-family: inherit; font-size: .78rem; padding: .25rem .4rem;
  border-radius: 5px; border: 1px solid rgba(128,128,128,.35);
  background: rgba(128,128,128,.1); color: inherit;
}
.sbc-clear-btn {
  font-family: inherit; font-size: .78rem; font-weight: 600; cursor: pointer;
  padding: .28rem .6rem; border-radius: 5px;
  border: 1px solid rgba(231,76,60,.45); background: rgba(231,76,60,.12); color: inherit;
  transition: background .12s;
}
.sbc-clear-btn:hover { background: rgba(231,76,60,.22); }
.sbc-prompt {
  padding: .6rem .7rem; border-radius: 8px;
  background: rgba(52,152,219,.1); border: 1px solid rgba(52,152,219,.35);
  display: flex; flex-direction: column; gap: .4rem;
}
.sbc-prompt-client {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .06em;
  opacity: .6; font-weight: 600;
}
.sbc-prompt-text { font-size: .82rem; line-height: 1.4; }
.sbc-hint-btn {
  align-self: flex-start; font-family: inherit; font-size: .72rem; cursor: pointer;
  padding: .25rem .5rem; border-radius: 5px;
  border: 1px solid rgba(128,128,128,.35); background: rgba(128,128,128,.1); color: inherit;
}
.sbc-prompt-hint { font-size: .78rem; font-style: italic; opacity: .8; }
.sbc-reqs { display: flex; flex-direction: column; gap: .3rem; }
.sbc-req {
  font-size: .78rem; padding: .3rem .5rem; border-radius: 5px;
  border: 1px solid transparent;
}
.sbc-req--met   { background: rgba(46,204,113,.14); border-color: rgba(46,204,113,.4); color: #2ecc71; }
.sbc-req--unmet { background: rgba(128,128,128,.08); border-color: rgba(128,128,128,.25); opacity: .8; }
.sbc-win {
  padding: .6rem .7rem; border-radius: 8px; font-weight: 600; font-size: .85rem;
  background: rgba(46,204,113,.2); border: 1px solid rgba(46,204,113,.55); color: #2ecc71;
}
.sbc-challenge-list { display: flex; flex-direction: column; gap: .3rem; }
.sbc-challenge-item {
  font-family: inherit; text-align: left; cursor: pointer; font-size: .8rem;
  padding: .4rem .55rem; border-radius: 6px; color: inherit;
  border: 1px solid rgba(128,128,128,.3); background: rgba(128,128,128,.07);
  transition: background .12s, border-color .12s;
}
.sbc-challenge-item:hover { background: rgba(128,128,128,.16); }
.sbc-challenge-item--active {
  background: rgba(52,152,219,.18); border-color: rgba(52,152,219,.55); font-weight: 600;
}
.sbc-animate-btn {
  font-family: inherit; font-size: .85rem; font-weight: 600; cursor: pointer;
  padding: .45rem .8rem; border-radius: 6px;
  border: 1px solid rgba(52,152,219,.5); background: rgba(52,152,219,.15); color: inherit;
}
.sbc-animate-btn:disabled { opacity: .4; cursor: default; }

/* grid styles (reused from animator.demo.html) */
.sb-grid { gap: 3px; margin-top: .4rem; }
.sb-head { text-align: center; font-size: .72rem; opacity: .55; padding-bottom: .15rem; }
.sb-cell {
  height: 2rem; display: flex; align-items: center; justify-content: center;
  border-radius: 5px; font-weight: 600; font-size: .78rem; color: #fff;
  transition: opacity .18s ease, transform .15s ease, box-shadow .15s ease;
}
.role-data   { background: rgba(52,152,219,.85); }
.role-mirror { background: rgba(155,89,182,.78); }
.role-P      { background: rgba(46,204,113,.85); }
.role-Q      { background: rgba(241,196,15,.92); color: #222; }
.sb-cell.dim   { opacity: .1; }
.sb-cell.flash { transform: scale(1.1); box-shadow: 0 0 12px rgba(255,255,255,.45); }
.sb-cell.lit   { opacity: 1; }

/* ================================================================== */
/* RESPONSIVE                                                          */
/* ================================================================== */

/* ---- desktop: pin the shell to the real viewport box ----------------- */
/* Some setups report 100vh larger than the usable height (here 100vh≈1074 vs
   innerHeight 1042), which added a ~32px page scrollbar. Anchoring the shell to
   height:100% along html→body→layout uses the actual viewport box instead, and
   overflow:hidden guarantees the app never scrolls the page. Desktop only — the
   <=900px layout below stays a normal scrolling column. */
@media (min-width: 901px) {
  html, body { height: 100%; overflow: hidden; }
  body { min-height: 0; }
  .sbc-layout { height: 100%; }
}

/* ---- large desktop (Full HD and up): use the extra width ---------- */
@media (min-width: 1600px) {
  .sbc-layout { grid-template-columns: 260px 1fr 320px; }
  .sbc-sidebar, .sbc-results { padding: 1.1rem; }
  .sbc-canvas { padding: 1.6rem; }
  .sbc-chip   { font-size: .82rem; padding: .45rem .75rem; }
  .sbc-level  { font-size: 1.35rem; }
  .sbc-stat   { font-size: .95rem; }
}

/* ---- narrow desktop / tablet landscape ----------------------------- */
@media (max-width: 1100px) and (min-width: 901px) {
  .sbc-layout { grid-template-columns: 180px 1fr 215px; }
}

/* ---- mobile / tablet portrait: single-column flow ------------------ */
@media (max-width: 900px) {
  /* The fixed-viewport grid becomes a normal scrolling page. */
  .sbc-layout {
    display: flex; flex-direction: column;
    height: auto; min-height: 100vh; overflow: visible;
  }

  .sbc-header { padding: .6rem .8rem; gap: .6rem .8rem; }
  /* Inline usage hint adds noise on small screens — the status bar is enough. */
  .sbc-header-hint { display: none; }
  .sbc-status { margin-left: 0; flex-basis: 100%; }

  /* Sidebar becomes a wrapping chip area above the canvas: the groups flow
     onto as many rows as the width allows, rather than scrolling off-screen.
     Each group is a flex item that grows to share the row and shrinks so its
     own chips can wrap inside it. */
  .sbc-sidebar {
    flex-direction: row; flex-wrap: wrap;
    align-items: flex-start;
    gap: .8rem 1.2rem;
    overflow: visible;
    border-right: none;
    border-bottom: 1px solid rgba(128,128,128,.2);
    padding: .6rem .8rem;
  }
  .sbc-sidebar > div { flex: 1 1 100%; min-width: 0; }
  .sbc-sidebar h3 { white-space: nowrap; }
  .sbc-chips { flex-wrap: wrap; }

  /* --- accordion: each group is a tappable, card-like collapsible row --- */
  /* JS (sidebar-accordion.js) toggles .is-open, one section at a time.    */
  .sbc-section {
    border: 1px solid rgba(128,128,128,.22);
    border-radius: 8px;
    overflow: hidden;
  }
  .sbc-section > h3 {
    margin: 0;
    cursor: pointer; user-select: none;
    display: flex; align-items: center; justify-content: space-between;
    gap: .5rem; padding: .7rem .85rem; min-height: 44px;
    background: rgba(128,128,128,.10);
    transition: background .12s ease;
  }
  .sbc-section > h3:hover,
  .sbc-section > h3:focus-visible { background: rgba(128,128,128,.18); }
  .sbc-section.is-open > h3 {
    background: rgba(128,128,128,.16);
    border-bottom: 1px solid rgba(128,128,128,.22);
  }
  /* Chevron: a clear, finger-sized affordance that rotates open. */
  .sbc-section > h3::after {
    content: '\25B8';   /* ▸ */
    font-size: 1.05rem; opacity: .75; line-height: 1;
    transition: transform .15s ease;
  }
  .sbc-section.is-open > h3::after { transform: rotate(90deg); }
  .sbc-section > .sbc-chips { display: none; padding: .7rem .85rem; }
  .sbc-section.is-open > .sbc-chips { display: flex; }

  /* Canvases stack with fixed working heights; the page scrolls instead. */
  /* Data layer gets a title bar matching the physical layer's — but no chevron,
     since it never collapses. Drop the faint corner label to avoid duplication. */
  .sbc-canvas::before { display: none; }
  .sbc-canvas-title {
    display: flex; align-items: center; gap: .5rem;
    margin: .6rem .6rem 0; padding: .7rem .85rem; min-height: 44px;
    font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; opacity: .9;
    background: rgba(128,128,128,.10);
    border: 1px solid rgba(128,128,128,.22); border-radius: 8px 8px 0 0;
  }
  .sbc-canvas {
    min-height: 46vh;
    margin: 0 .6rem .3rem;            /* flush under its title bar */
    border-top: none; border-radius: 0 0 10px 10px;
  }
  /* Physical layer collapses under its own toggle (secondary view). Collapsed
     by default via JS; the panel framing moves onto the open canvas so the
     closed state is just a tappable bar. */
  .sbc-physical {
    min-height: 0;
    margin: .3rem .6rem .6rem;
    border: none; background: none; overflow: visible;
  }
  .sbc-physical::before { display: none; }   /* the toggle text is the label now */
  .sbc-physical-toggle {
    display: flex; width: 100%;
    align-items: center; justify-content: space-between; gap: .5rem;
    margin: 0; padding: .7rem .85rem; min-height: 44px;
    font: inherit; color: inherit; text-align: left;
    font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; opacity: .9;
    background: rgba(128,128,128,.10);
    border: 1px solid rgba(128,128,128,.22); border-radius: 8px;
    cursor: pointer; transition: background .12s ease;
  }
  .sbc-physical-toggle:hover,
  .sbc-physical-toggle:focus-visible { background: rgba(128,128,128,.18); }
  .sbc-physical-toggle::after {
    content: '\25B8'; font-size: 1.05rem; opacity: .75; line-height: 1;
    transition: transform .15s ease;
  }
  .sbc-physical.is-open .sbc-physical-toggle { border-radius: 8px 8px 0 0; }
  .sbc-physical.is-open .sbc-physical-toggle::after { transform: rotate(90deg); }

  .sbc-physical .pln-canvas { display: none; }
  .sbc-physical.is-open .pln-canvas {
    display: block; min-height: 34vh;
    border: 2px dashed rgba(128,128,128,.3); border-top: none;
    border-radius: 0 0 10px 10px;
    background: rgba(0,0,0,.05);
  }

  /* Results panel flows below the canvases. */
  .sbc-results {
    border-left: none;
    border-top: 1px solid rgba(128,128,128,.2);
    overflow-y: visible;
  }
}

/* ---- touch devices: bigger targets, no hover-gated controls -------- */
@media (pointer: coarse) {
  .sbc-chip {
    min-height: 40px;
    display: inline-flex; align-items: center;
    padding: .45rem .8rem;
  }
  .sbc-disk { min-height: 40px; display: inline-flex; align-items: center; }
  .pln-node { min-height: 38px; }

  /* Hover doesn't exist on touch — keep delete buttons visible. */
  .sbc-delete, .pln-delete { opacity: .65; }
  .sbc-slot--filled .sbc-delete--inline { opacity: .65; }

  /* Port dots need a finger-sized hit area. */
  .pln-port { width: 18px; height: 18px; }
  .pln-port--in  { left:  -11px; }
  .pln-port--out { right: -11px; }
}

/* Draggables: avoid double-tap zoom delays and long-press text selection,
   so the touch-DnD shim can take over the gesture cleanly. */
[draggable="true"] {
  touch-action: manipulation;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}