/* ═══════════════════════════════════════════════
   ToDo Tensor — one black scene, drawn at ranks 0 to 3,
   with the list and the parameters in a panel at its side
   ═══════════════════════════════════════════════ */

:root {
  /* Black and white only. White at four strengths does all the work:
     full for what is focused, 60% for words, 34% for secondary marks,
     16% for hairlines. Color comes later, as highlights the list's owner
     picks, not as decoration. */
  --tt-void: #000000;
  --tt-ink: #ffffff;
  --tt-dim: rgba(255, 255, 255, 0.6);
  --tt-faint: rgba(255, 255, 255, 0.34);
  --tt-rule: rgba(255, 255, 255, 0.16);
  --tt-panel: 440px;
  --tt-ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

html {
  background: var(--tt-void);
  color-scheme: dark; /* so dialogs, scrollbars and autofill come out dark too */
}

/* styles.css already fits the page to one screen; the scene wants that. */
body.tt {
  background: var(--tt-void);
  color: var(--tt-ink);
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

body.tt .site-nav { background: var(--tt-void); }

.tt-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

body.tt [hidden] { display: none !important; }

.tt-noscript {
  position: absolute;
  left: 24px;
  top: 80px;
  max-width: 420px;
  color: var(--tt-dim);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* Round icon buttons: swap, remove, and the one on each parameter row. */
.tt-icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--tt-faint);
  cursor: pointer;
  transition: color 0.2s, background 0.2s, opacity 0.2s;
}

.tt-icon:hover,
.tt-icon:focus-visible {
  color: var(--tt-ink);
  background: rgba(255, 255, 255, 0.1);
  outline: none;
}

/* ── Shell: scene | panel ── */

.tt-space {
  position: relative;
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 0;
  transition: grid-template-columns 0.5s var(--tt-ease);
}

.tt-space.has-panel { grid-template-columns: minmax(0, 1fr) var(--tt-panel); }

.tt-scene {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
}

.tt-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none; /* a finger on the scene drags a node or turns the cube, never the page */
}

/* The small print in the corners: rank, faces, the panel toggle, the name. */

.tt-hud {
  position: absolute;
  top: 22px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  line-height: 1;
}

.tt-hud-left { left: 24px; }
.tt-hud-right { right: 24px; }

.tt-rank-word { color: var(--tt-ink); }

/* The rank picker lives at the top of the panel; the corner only names it. */
.tt-rank-set {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 26px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--tt-rule);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  line-height: 1;
}

.tt-rank-label { color: var(--tt-ink); }

.tt-ranks { display: flex; gap: 6px; }

.tt-rank-set .tt-rank-btn { min-width: 40px; padding: 10px 12px; border: 1px solid var(--tt-rule); }
.tt-rank-set .tt-rank-btn[aria-checked="true"] { border-color: var(--tt-ink); }

.tt-rank-btn,
.tt-face,
.tt-hud-btn {
  padding: 6px 7px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--tt-faint);
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  cursor: pointer;
  transition: color 0.2s, background 0.2s;
}

.tt-rank-btn:hover,
.tt-face:hover,
.tt-hud-btn:hover { color: var(--tt-dim); }

.tt-rank-btn:focus-visible,
.tt-face:focus-visible,
.tt-hud-btn:focus-visible {
  outline: none;
  color: var(--tt-ink);
  box-shadow: 0 0 0 1px var(--tt-ink);
}

.tt-rank-btn[aria-checked="true"],
.tt-face.is-on,
.tt-hud-btn[aria-expanded="true"] { color: var(--tt-ink); }

.tt-faces { display: flex; gap: 2px; }

/* the panel toggle: » while the panel is open (push it away), « while shut */
.tt-panel-toggle { display: grid; place-items: center; padding: 6px 8px; color: var(--tt-dim); }
.tt-panel-toggle:hover { color: var(--tt-ink); }
.tt-panel-toggle svg { display: block; transition: transform 0.3s var(--tt-ease); }
.tt-panel-toggle[aria-expanded="false"] svg { transform: scaleX(-1); }

.tt-mark {
  position: absolute;
  left: 24px;
  bottom: 20px;
  z-index: 2;
  margin: 0;
  color: var(--tt-faint);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  line-height: 1;
}

/* ── Tray: ideas not yet placed on the shown parameters ── */

.tt-tray {
  position: absolute;
  left: 50%;
  bottom: 18px;
  z-index: 2;
  width: min(66%, 760px);
  transform: translateX(-50%);
  text-align: center;
}

.tt-tray-label {
  margin: 0 0 8px;
  color: var(--tt-faint);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

/* One row that scrolls sideways when full: a finger moving across it
   scrolls, a finger moving up out of it lifts a pill. */
.tt-tray-nodes {
  display: flex;
  gap: 6px;
  padding: 2px 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  /* the ends fade, so a pill cut off by the edge reads as "more this way" */
  -webkit-mask-image: linear-gradient(to right, transparent, #000 28px, #000 calc(100% - 28px), transparent);
  mask-image: linear-gradient(to right, transparent, #000 28px, #000 calc(100% - 28px), transparent);
}

.tt-tray-nodes::-webkit-scrollbar { display: none; }

/* centred while there is room, scrolling from the left edge once there isn't */
.tt-tray-node:first-child { margin-left: auto; }
.tt-tray-node:last-child { margin-right: auto; }

.tt-tray-node {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: min(100%, 220px);
  padding: 5px 10px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--tt-faint);
  font: inherit;
  font-size: 0.8rem;
  line-height: 1.2;
  cursor: grab;
  touch-action: pan-x;
  transition: color 0.2s, opacity 0.2s;
}

.tt-tray-node:hover,
.tt-tray-node:focus-visible,
.tt-tray-node.is-focus { color: var(--tt-ink); outline: none; }

.tt-tray-node:focus-visible { box-shadow: 0 0 0 1px var(--tt-rule); }

.tt-tray-node.is-lifted { opacity: 0; }

.tt-tray-node .tt-dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.tt-tray-node.is-done .tt-dot {
  background: transparent;
  box-shadow: inset 0 0 0 1px currentColor;
}

.tt-tray-node .tt-tray-text {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

body.tt-free .tt-tray-node { cursor: pointer; }

/* ── Card: the focused idea, beside its node ── */

.tt-card {
  position: absolute;
  z-index: 3;
  width: 272px;
  max-width: calc(100% - 32px);
  padding: 10px 10px 10px 4px;
  border: 1px solid var(--tt-rule);
  border-radius: 12px;
  background: var(--tt-void);
  transform: translate(var(--x, 0px), var(--y, 0px));
}

.tt-card .tt-item { padding: 0; }

/* ── Panel ── */

.tt-panel {
  position: relative;
  min-height: 0;
  overflow: hidden;
  border-left: 1px solid var(--tt-rule);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0s 0.3s;
}

.tt-space.has-panel .tt-panel {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s 0.15s, visibility 0s;
}

.tt-panel-scroll {
  box-sizing: border-box;
  width: var(--tt-panel);
  height: 100%;
  overflow-y: auto;
  padding: 22px 20px 60px;
  scrollbar-width: thin;
  scrollbar-color: var(--tt-rule) transparent;
}

/* Parameters */

.tt-params { margin-bottom: 26px; }

.tt-param {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr) 24px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 6px;
  padding: 4px 0;
  transition: opacity 0.2s;
}

/* past the rank: kept, not drawn */
.tt-param.is-hidden { opacity: 0.4; }
.tt-param.is-hidden:hover,
.tt-param.is-hidden:focus-within { opacity: 1; }

.tt-param-add { margin: 10px 0 0 20px; }

.tt-param-n {
  color: var(--tt-faint);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.1em;
}

.tt-pole {
  display: block;
  width: 100%;
  min-width: 0;
  resize: none;
  overflow: hidden;
  overflow-wrap: anywhere;   /* long words wrap too */
  field-sizing: content;     /* grows with its text where supported; the script does it elsewhere */
  line-height: 1.3;
  padding: 8px 0;
  border: 0;
  border-bottom: 1px solid var(--tt-rule);
  background: transparent;
  color: var(--tt-ink);
  font: inherit;
  font-size: 1rem; /* 16px: anything smaller makes iOS zoom in on focus */
  outline: none;
  transition: border-color 0.2s;
}

.tt-pole[data-side="right"] { text-align: right; }
.tt-pole::placeholder { color: var(--tt-faint); }
.tt-pole:focus { border-color: var(--tt-ink); }

.tt-swap,
.tt-param-remove { width: 24px; height: 24px; }

.tt-params-note {
  margin: 10px 0 0 20px;
  color: var(--tt-faint);
  font-size: 0.78rem;
  line-height: 1.45;
}

/* ── Add ── */

.tt-add {
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--tt-rule);
  transition: border-color 0.2s;
}

.tt-add:focus-within { border-color: var(--tt-ink); }

.tt-new {
  flex: 1;
  min-width: 0;
  padding: 12px 0;
  border: 0;
  background: transparent;
  color: var(--tt-ink);
  font: inherit;
  font-size: 1rem;
  outline: none;
}

.tt-new::placeholder { color: var(--tt-faint); }

.tt-add-btn {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--tt-rule);
  border-radius: 50%;
  background: transparent;
  color: var(--tt-ink);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.tt-add-btn:hover,
.tt-add-btn:focus-visible {
  border-color: var(--tt-ink);
  background: rgba(255, 255, 255, 0.1);
  outline: none;
}

.tt-count {
  min-height: 1.2em;
  margin-top: 16px;
  color: var(--tt-faint);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* ── List ── */

.tt-list {
  position: relative; /* rows measure their offsetTop from here while dragging */
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}

.tt-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 4px 8px 0;
  border-radius: 10px;
  background: var(--tt-void);
  transition: background 0.2s;
}

.tt-item + .tt-item { margin-top: 1px; }

.tt-item.is-focus,
.tt-item.is-hover { background: #0b0b0b; }

.tt-body {
  flex: 1;
  min-width: 0;
}

/* Grip */

.tt-grip {
  flex: none;
  display: grid;
  place-items: center;
  width: 22px;
  height: 26px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--tt-faint);
  cursor: grab;
  touch-action: none; /* a drag on the grip moves the row, not the page */
  transition: color 0.2s;
}

.tt-grip:hover,
.tt-grip:focus-visible { color: var(--tt-ink); outline: none; }
.tt-grip:focus-visible { box-shadow: 0 0 0 1px var(--tt-ink); }

/* Check */

.tt-check {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  cursor: pointer;
}

.tt-check input {
  position: absolute;
  inset: 0;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.tt-box {
  display: grid;
  place-items: center;
  width: 18px;
  height: 18px;
  border: 1.5px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  color: var(--tt-void);
  transition: background 0.18s, border-color 0.18s;
}

.tt-box svg { opacity: 0; transition: opacity 0.18s; }

.tt-check:hover .tt-box { border-color: var(--tt-ink); }

.tt-check input:focus-visible + .tt-box { box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3); }

.tt-check input:checked + .tt-box {
  border-color: var(--tt-ink);
  background: var(--tt-ink);
}

.tt-check input:checked + .tt-box svg { opacity: 1; }

/* Text */

.tt-text {
  display: block;
  width: 100%;
  padding: 3px 0;
  border: 0;
  background: transparent;
  color: var(--tt-ink);
  font: inherit;
  font-size: 1rem;
  line-height: 1.4;
  text-align: left;
  overflow-wrap: anywhere;
  cursor: text;
  transition: color 0.2s;
}

.tt-text:focus-visible {
  outline: none;
  text-decoration: underline;
  text-decoration-color: var(--tt-ink);
  text-underline-offset: 4px;
}

.tt-item.is-done .tt-text {
  color: var(--tt-faint);
  text-decoration: line-through;
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

.tt-edit {
  display: block;
  box-sizing: border-box;
  width: 100%;
  padding: 2px 0;
  border: 0;
  border-bottom: 1px solid var(--tt-ink);
  background: transparent;
  color: var(--tt-ink);
  font: inherit;
  font-size: 1rem;
  line-height: 1.4;
  outline: none;
}

/* Sliders: one hairline per shown parameter, the pole words at its ends.
   No thumb until the idea has been placed. */

.tt-sliders { margin: 4px 0 2px; }

.tt-slider {
  display: grid;
  /* the two pole words share a row above the track, so each gets half the
     width and wraps instead of being cut to a few letters */
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  grid-template-areas: "left right" "track track";
  align-items: start;
  gap: 4px 16px;
  padding: 6px 0;
  border-radius: 4px;
  cursor: pointer;
  touch-action: none;
}

.tt-slider:focus-visible { outline: none; box-shadow: 0 0 0 1px var(--tt-rule); }

.tt-slider-pole {
  min-width: 0;
  grid-area: left;
  color: var(--tt-dim);
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  overflow-wrap: anywhere;
}

.tt-slider-pole:last-child { grid-area: right; text-align: right; }

.tt-slider-track {
  grid-area: track;
  position: relative;
  height: 14px;
}

.tt-slider-track::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--tt-rule);
}

.tt-slider-track::after {
  /* the midpoint, so "neither" has a place */
  content: "";
  position: absolute;
  left: 50%;
  top: 4px;
  width: 1px;
  height: 6px;
  background: var(--tt-rule);
}

.tt-slider-thumb {
  position: absolute;
  top: 50%;
  left: var(--v, 50%);
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--tt-ink);
  transform: translate(-50%, -50%);
  transition: left 0.15s;
}

.tt-slider.is-unset .tt-slider-thumb { display: none; }
.tt-slider.is-dragging .tt-slider-thumb { transition: none; }
.tt-slider:hover .tt-slider-track::before,
.tt-slider:focus-visible .tt-slider-track::before { background: var(--tt-faint); }
.tt-item.is-done .tt-slider-thumb { background: transparent; box-shadow: inset 0 0 0 1px var(--tt-ink); }

/* Remove: with a mouse, the control waits until the row is pointed at. */
@media (hover: hover) {
  .tt-list .tt-remove { opacity: 0; }
  .tt-list .tt-item:hover .tt-remove,
  .tt-list .tt-item:focus-within .tt-remove { opacity: 1; }
}

/* Dragging a row */

body.tt-dragging,
body.tt-dragging * {
  cursor: grabbing !important;
  user-select: none;
  -webkit-user-select: none;
}

.tt-item.is-dragging {
  z-index: 2;
  background: #0b0b0b;
  box-shadow: 0 0 0 1px var(--tt-rule), 0 10px 40px rgba(255, 255, 255, 0.16);
}

.tt-item.is-dragging .tt-grip { color: var(--tt-ink); }

.tt-empty {
  margin-top: 20px;
  color: var(--tt-faint);
  font-size: 0.9rem;
}

/* ── Foot ── */

.tt-foot {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--tt-rule);
  color: var(--tt-faint);
  font-size: 0.78rem;
  line-height: 1.5;
}

.tt-foot-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 8px;
}

.tt-quiet {
  padding: 2px 0;
  border: 0;
  background: transparent;
  color: var(--tt-dim);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: var(--tt-rule);
  text-underline-offset: 3px;
}

.tt-quiet:hover,
.tt-quiet:focus-visible {
  color: var(--tt-ink);
  text-decoration-color: currentColor;
  outline: none;
}

/* ── Toast ── */

.tt-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 300;
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: calc(100vw - 32px);
  padding: 10px 12px 10px 18px;
  border: 1px solid var(--tt-rule);
  border-radius: 999px;
  background: #0d0d0d;
  color: var(--tt-dim);
  font-size: 0.85rem;
  transform: translateX(-50%);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.8);
}

/* above the tray while there is one */
body.tt-has-tray .tt-toast { bottom: 116px; }

#tt-toast-msg {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tt-undo {
  flex: none;
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  background: transparent;
  color: var(--tt-ink);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
}

.tt-undo:hover,
.tt-undo:focus-visible { background: rgba(255, 255, 255, 0.12); outline: none; }

/* ── Narrow screens: the panel becomes a sheet under the scene ── */

@media (max-width: 760px) {
  .tt-space {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) 0;
    transition: grid-template-rows 0.5s var(--tt-ease);
  }

  .tt-space.has-panel {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) 46%;
  }

  .tt-panel { border-left: 0; border-top: 1px solid var(--tt-rule); }
  .tt-panel-scroll { width: 100%; padding: 16px 16px 48px; }

  .tt-hud { top: 16px; }
  .tt-hud-left { left: 16px; }
  .tt-hud-right { right: 16px; }
  .tt-mark { left: 16px; bottom: 14px; }
  .tt-scene.has-tray .tt-mark { display: none; } /* the tray needs the whole width */
  .tt-tray { width: calc(100% - 32px); bottom: 12px; }
  body.tt-has-tray .tt-toast { bottom: 24px; } /* the panel sheet is below the tray here */
  .tt-card { width: 240px; }
  .tt-grip { width: 26px; height: 30px; }
  .tt-remove { width: 30px; height: 30px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ── Read-only: what a visitor sees ──
   The same scene and list with every editing control taken away. The
   script leaves the controls out; these rules settle what is left. */

.tt-readonly .tt-add { display: none; }
.tt-readonly .tt-count { margin-top: 0; }

.tt-text.is-static { margin: 0; cursor: default; }

.tt-check input:disabled { cursor: default; }
.tt-check:has(input:disabled) { cursor: default; }
.tt-check:has(input:disabled):hover .tt-box { border-color: rgba(255, 255, 255, 0.55); }
.tt-check:has(input:disabled:checked):hover .tt-box { border-color: var(--tt-ink); }

.tt-slider.is-static { cursor: default; }

.tt-param.is-static {
  grid-template-columns: 14px minmax(0, 1fr) auto minmax(0, 1fr);
  padding: 6px 0;
}

.tt-pole-text {
  min-width: 0;
  color: var(--tt-ink);
  font-size: 1rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.tt-pole-text:last-child { text-align: right; }

.tt-param-to {
  color: var(--tt-faint);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.tt-rank-set .tt-rank-btn:disabled {
  opacity: 0.3;
  cursor: default;
}

.tt-rank-set .tt-rank-btn:disabled:hover { color: var(--tt-faint); }

/* ── The owner's sign-in ── */

.tt-signin {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin-top: 12px;
}

.tt-signin[hidden] { display: none; }

.tt-password {
  flex: 1;
  min-width: 0;
  padding: 8px 0;
  border: 0;
  border-bottom: 1px solid var(--tt-rule);
  background: transparent;
  color: var(--tt-ink);
  font: inherit;
  font-size: 1rem; /* 16px, so iOS does not zoom in on focus */
  outline: none;
}

.tt-password:focus { border-color: var(--tt-ink); }
.tt-password::placeholder { color: var(--tt-faint); }

.tt-signin-note {
  flex-basis: 100%;
  min-height: 1.2em;
  margin: 0;
  color: var(--tt-dim);
}

#tt-status-acts { margin-top: 2px; }
#tt-status-acts[hidden] { display: none; }