/* ==================================================================
   THREAD
   The interface stays out of the way of the weave. Everything here is
   either information you need continuously or a decision you are being
   asked to make right now. Nothing decorative sits on top of the canvas.
   ================================================================== */

:root {
  --bg: #080d14;
  --bg-glow: #0f1c2b;
  --ink: #e8f2fb;
  --ink-soft: #8fa6bd;
  --surface: rgba(14, 26, 40, 0.86);
  --edge: rgba(150, 196, 235, 0.20);
  --accent: #7fd4c1;

  --sans: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --serif: 'Iowan Old Style', 'Palatino Linotype', Palatino, Charter, Georgia, serif;

  --step: 8px;
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;

  --t-fast: 160ms;
  --t-mid: 320ms;
  --t-slow: 620ms;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

/* Layout classes below set display, so hidden has to outrank them. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

body { transition: background var(--t-slow) var(--ease); }

#app { position: fixed; inset: 0; }

#stage {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ------------------------------------------------------------------
   Buttons
   ------------------------------------------------------------------ */

.btn {
  font: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--bg);
  background: var(--ink);
  border: 1px solid var(--ink);
  padding: 0.72em 1.5em;
  border-radius: 100px;
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease),
              opacity var(--t-fast) var(--ease),
              background var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.btn-big { font-size: 1rem; padding: 0.9em 2.2em; }

.btn-quiet {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--edge);
}
.btn-quiet:hover { color: var(--ink); border-color: var(--ink-soft); }

.icon-btn {
  font: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--edge);
  border-radius: 100px;
  padding: 0.5em 1em;
  cursor: pointer;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink-soft); }
.icon-btn.ghost { border-color: transparent; }

/* ------------------------------------------------------------------
   Heads up display
   ------------------------------------------------------------------ */

#hud {
  position: absolute;
  inset: 0;
  pointer-events: none;
  padding: clamp(16px, 2.4vw, 32px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
#hud button { pointer-events: auto; }

.hud-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.hud-count {
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-soft);
  opacity: 0.75;
}
.hud-level h1 {
  font-family: var(--serif);
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin: 0.2em 0 0.12em;
}
.hud-level p {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.94rem;
  color: var(--ink-soft);
  margin: 0;
  max-width: 34ch;
  line-height: 1.45;
}

.hud-right {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-shrink: 0;
}

.gauge { text-align: right; }
.gauge-label {
  display: block;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  opacity: 0.7;
  margin-bottom: 6px;
}

.ladder, .pips { display: flex; gap: 5px; justify-content: flex-end; }

.ladder i {
  display: block;
  width: 22px; height: 3px;
  border-radius: 2px;
  background: var(--edge);
  transition: background var(--t-mid) var(--ease), width var(--t-mid) var(--ease);
}
.ladder i.on { background: var(--ink); width: 30px; }

.pips i {
  display: block;
  width: 9px; height: 9px;
  border-radius: 50%;
  border: 1px solid var(--edge);
  transition: background var(--t-mid) var(--ease), border-color var(--t-mid);
}
.pips i.on { background: var(--accent); border-color: var(--accent); }
.pips i.part { background: linear-gradient(90deg, var(--accent) 50%, transparent 50%); }

.hud-bottom {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
}
.keys {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 20px;
  font-size: 0.76rem;
  color: var(--ink-soft);
  opacity: 0.6;
  transition: opacity var(--t-mid);
}
#hud:hover .keys { opacity: 0.9; }
.keys b { font-weight: 600; color: var(--ink); }

.log {
  position: absolute;
  left: clamp(16px, 2.4vw, 32px);
  /* Clears the composite meter, which the canvas draws near the bottom. */
  bottom: 168px;
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  max-width: 44ch;
  pointer-events: none;
}
.log p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.4;
  color: var(--ink-soft);
  background: var(--surface);
  border-left: 2px solid var(--edge);
  padding: 7px 12px;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  animation: logIn var(--t-mid) var(--ease);
}
.log p.good { color: var(--accent); border-left-color: var(--accent); }
.log p.loss { border-left-color: #c98a6b; color: #e0b39c; }
.log p.fade { opacity: 0; transition: opacity var(--t-slow) linear; }

@keyframes logIn {
  from { opacity: 0; transform: translateX(-8px); }
  to { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------------
   Mask and settle
   ------------------------------------------------------------------ */

.tools {
  position: absolute;
  left: clamp(16px, 2.4vw, 32px);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: auto;
}

.tool {
  font: inherit;
  text-align: left;
  width: 186px;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--edge);
  border-radius: var(--r-md);
  padding: 11px 13px;
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--t-mid), border-color var(--t-fast),
              background var(--t-fast), transform var(--t-fast) var(--ease);
}
#hud:hover .tool { opacity: 1; }
.tool:hover { border-color: var(--ink-soft); transform: translateX(2px); }
.tool:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; opacity: 1; }
.tool.on {
  opacity: 1;
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}
.tool b { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 3px; }
.tool span { display: block; font-size: 0.72rem; line-height: 1.4; color: var(--ink-soft); }

/* ------------------------------------------------------------------
   A fragment found in the weave
   ------------------------------------------------------------------ */

.fragment {
  position: absolute;
  left: 50%;
  top: clamp(96px, 16vh, 170px);
  transform: translateX(-50%);
  max-width: min(46ch, calc(100vw - 48px));
  pointer-events: none;
  animation: fragIn 900ms var(--ease);
}
.fragment.out { opacity: 0; transition: opacity 1.1s linear; }
.fragment p {
  margin: 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(1.02rem, 2.1vw, 1.28rem);
  line-height: 1.55;
  text-align: center;
  color: var(--ink);
  text-shadow: 0 2px 18px var(--bg), 0 0 34px var(--bg);
}
@keyframes fragIn {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.hud-bottom-right { display: flex; gap: 8px; }

.gauge-read {
  display: block;
  font-size: 0.68rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-top: 5px;
}

/* ------------------------------------------------------------------
   Teaching prompt
   ------------------------------------------------------------------ */

.teach {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: clamp(150px, 22vh, 230px);
  width: min(480px, calc(100vw - 40px));
  background: var(--surface);
  border: 1px solid var(--edge);
  border-left: 2px solid var(--accent);
  border-radius: var(--r-md);
  padding: 15px 18px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  pointer-events: auto;
  animation: teachIn var(--t-mid) var(--ease);
  z-index: 4;
}
.teach p {
  margin: 0 0 10px;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--ink);
}
@keyframes teachIn {
  from { opacity: 0; transform: translate(-50%, 8px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* About ---------------------------------------------------------- */

.about-sub {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 400;
  margin: clamp(26px, 5vh, 38px) 0 10px;
}
.source {
  border-left: 2px solid var(--edge);
  padding: 2px 0 2px 16px;
  margin-bottom: 18px;
}
.source b { display: block; font-size: 0.98rem; font-weight: 600; }
.source i {
  display: block;
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin: 3px 0 7px;
}
.source p { margin: 0; font-size: 0.9rem; line-height: 1.6; color: var(--ink-soft); }

/* ------------------------------------------------------------------
   Interruption
   ------------------------------------------------------------------ */

.card {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: var(--surface);
  border: 1px solid var(--edge);
  border-radius: var(--r-lg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.interrupt {
  bottom: clamp(90px, 12vh, 140px);
  width: min(560px, calc(100vw - 40px));
  padding: 20px 24px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  animation: cardIn var(--t-mid) var(--ease);
}
@keyframes cardIn {
  from { opacity: 0; transform: translate(-50%, 14px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

.interrupt.warning { opacity: 0.82; }
.interrupt.warning .interrupt-actions,
.interrupt.warning .interrupt-note { display: none; }
.interrupt:not(.warning) .interrupt-warn { display: none; }

.interrupt-ring { width: 44px; height: 44px; flex-shrink: 0; }
.interrupt-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--edge); stroke-width: 3; }
.ring-fg {
  fill: none; stroke: var(--ink); stroke-width: 3; stroke-linecap: round;
  stroke-dasharray: 119.4; stroke-dashoffset: 119.4;
  transition: stroke-dashoffset 120ms linear;
}

.interrupt-body { flex: 1; min-width: 0; }
.interrupt-warn {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.interrupt-text {
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.4;
  margin: 0 0 14px;
}
.interrupt-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.interrupt-note {
  margin: 12px 0 0;
  font-size: 0.76rem;
  color: var(--ink-soft);
  opacity: 0.8;
}
#refuseBtn[disabled] { opacity: 0.35; cursor: not-allowed; }

/* ------------------------------------------------------------------
   Overlays
   ------------------------------------------------------------------ */

.overlay {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  display: grid;
  place-items: center;
  padding: clamp(20px, 4vw, 56px);
  overflow-y: auto;
  animation: fadeIn var(--t-mid) var(--ease);
  z-index: 10;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.title-inner { max-width: 46ch; text-align: left; }

.eyebrow {
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 clamp(20px, 4vh, 40px);
}

.wordmark {
  font-family: var(--serif);
  font-size: clamp(3.4rem, 13vw, 8rem);
  font-weight: 400;
  letter-spacing: 0.16em;
  line-height: 0.94;
  margin: 0;
  text-indent: 0.16em;
}

.strap {
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  font-style: italic;
  line-height: 1.5;
  color: var(--ink-soft);
  margin: clamp(20px, 3vh, 32px) 0 clamp(28px, 5vh, 48px);
  max-width: 30ch;
}

.title-actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }

.credit {
  margin: clamp(32px, 6vh, 56px) 0 0;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--ink-soft);
  opacity: 0.72;
  max-width: 42ch;
  border-top: 1px solid var(--edge);
  padding-top: 18px;
}

/* Calibration -------------------------------------------------- */

.calib-inner { max-width: 66ch; width: 100%; }
.calib-inner h2 {
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 400;
  margin: 0 0 0.5em;
}
.calib-intro {
  font-size: 0.96rem;
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 54ch;
  margin: 0 0 clamp(28px, 5vh, 44px);
}

.calib-group { border: 0; padding: 0; margin: 0 0 clamp(22px, 4vh, 34px); }
.calib-group legend {
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 0;
  margin-bottom: 12px;
}

.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(168px, 1fr)); gap: 10px; }

.choice {
  font: inherit;
  text-align: left;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--edge);
  border-radius: var(--r-md);
  padding: 14px 16px;
  cursor: pointer;
  transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast) var(--ease);
}
.choice:hover { border-color: var(--ink-soft); transform: translateY(-2px); }
.choice:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.choice[aria-checked="true"] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.choice b { display: block; font-weight: 600; font-size: 0.94rem; margin-bottom: 4px; }
.choice span { display: block; font-size: 0.8rem; line-height: 1.45; color: var(--ink-soft); }

.calib-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: clamp(24px, 4vh, 36px); }

/* Reflection ---------------------------------------------------- */

.reflect-inner { max-width: 56ch; width: 100%; }
.reflect-inner h2 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  font-weight: 400;
  margin: 0 0 clamp(24px, 4vh, 36px);
  line-height: 1.15;
}

/* Cells carry their own rules rather than showing a container colour through
   a gap, so a part-filled last row leaves empty space instead of a ghost tile. */
.reflect-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  border-top: 1px solid var(--edge);
  border-left: 1px solid var(--edge);
  border-radius: var(--r-md);
  overflow: hidden;
}
.reflect-grid div {
  padding: 16px 18px;
  border-right: 1px solid var(--edge);
  border-bottom: 1px solid var(--edge);
}
.reflect-grid dt {
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.reflect-grid dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.7rem;
  line-height: 1;
}
.reflect-grid dd small {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--ink-soft);
  margin-left: 4px;
}

.reflect-note {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin: clamp(22px, 4vh, 32px) 0 0;
  max-width: 46ch;
}

/* Drawer -------------------------------------------------------- */

.drawer {
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: min(340px, 88vw);
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--edge);
  padding: clamp(20px, 3vw, 30px);
  overflow-y: auto;
  z-index: 20;
  animation: slideIn var(--t-mid) var(--ease);
}
@keyframes slideIn { from { transform: translateX(100%); } to { transform: none; } }

.drawer h3 {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 400;
  margin: 0 0 20px;
}
.drawer .calib-group { margin-bottom: 22px; }
.drawer .choices { grid-template-columns: 1fr; }
.drawer .choice { padding: 10px 13px; }
.drawer .choice span { display: none; }

/* ------------------------------------------------------------------
   Respecting the system, not only our own switch
   ------------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (max-width: 720px) {
  .hud-level p { display: none; }
  .keys { display: none; }
  .hud-right { gap: 12px; }
  .interrupt { bottom: 76px; }
}

@media (max-width: 900px) {
  /* Tools move out of the way of a narrower weave. */
  .tools {
    top: auto;
    bottom: 62px;
    transform: none;
    flex-direction: row;
  }
  .tool { width: auto; flex: 1; opacity: 1; }
  .tool span { display: none; }
  .log { bottom: 220px; }
  /* Clear the tools row, which sits at 62px and is about 44px tall. */
  .interrupt { bottom: 124px; }
  .teach { bottom: 124px; }
}

/* Narrow phones: the header has to give way to the weave, not compete with it. */
@media (max-width: 480px) {
  #hud { padding: 12px; }
  .hud-top { align-items: center; gap: 10px; }
  .hud-level h1 { font-size: 1.05rem; margin: 2px 0 0; }
  .hud-count { font-size: 0.58rem; letter-spacing: 0.16em; }
  .gauge-label { display: none; }
  .ladder i { width: 14px; }
  .ladder i.on { width: 20px; }
  .pips i { width: 7px; height: 7px; }
  .icon-btn { padding: 0.42em 0.8em; font-size: 0.62rem; }
  .log { bottom: 150px; max-width: calc(100vw - 24px); }
  .log p { font-size: 0.8rem; }
  .interrupt { padding: 16px; gap: 12px; }
  .interrupt-text { font-size: 0.98rem; }
  .interrupt-ring { width: 32px; height: 32px; }
  .wordmark { letter-spacing: 0.1em; text-indent: 0.1em; }
}