:root {
  --ink: #111113;
  --ink-soft: rgba(17, 17, 19, 0.55);
  --paper: #ffffff;
  --accent: #ff9a3c;
  --gutter: 40px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --font: 'Inter Tight', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  background: radial-gradient(120% 95% at 64% 40%, #eeeff0 0%, #cfd0d3 34%, #a4a6ab 72%, #86888d 100%) fixed;
  background-color: #b5b7bb;
  color: var(--ink);
  font-family: var(--font);
  font-weight: 400;
  letter-spacing: -0.02em;
  overflow: hidden;
  overscroll-behavior: none;
}

button {
  font: inherit;
  color: inherit;
  letter-spacing: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a {
  color: inherit;
}

sup {
  font-size: 0.5em;
  vertical-align: top;
  position: relative;
  top: 0.1em;
  margin-left: 0.04em;
}

.u-underline {
  text-decoration: underline;
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
}

/* ——— Stage ——— */
.c-stage {
  position: fixed;
  inset: 0;
  z-index: 0;
}

.c-stage canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 1.6s var(--ease), transform 2.4s var(--ease);
}

html.is-ready .c-stage canvas {
  opacity: 1;
  transform: none;
}

/* ——— Header ——— */
.c-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 26px var(--gutter);
  font-size: 26px;
  line-height: 1;
  pointer-events: none;
}

.c-header > * {
  pointer-events: auto;
}

.c-header_logo {
  text-decoration: none;
  letter-spacing: -0.03em;
}

.c-header_status {
  position: absolute;
  left: 50%;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 7px 12px 7px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transform: translateX(-50%);
  font-weight: 500;
}

.c-header_status-label {
  color: var(--ink-soft);
  font-weight: 400;
}

.c-header_dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(255, 154, 60, 0.6);
  animation: pulse 2.2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 154, 60, 0.55); }
  70% { box-shadow: 0 0 0 9px rgba(255, 154, 60, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 154, 60, 0); }
}

.c-header_cta {
  letter-spacing: -0.03em;
  position: relative;
  color: inherit;
  text-decoration: none;
}

.c-header_nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

/* SCANNER: same white pill as the dialog choices, so it reads as a button */
.c-header_btn {
  letter-spacing: 0.02em;
}

.c-header_cta::after,
.c-header_logo::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -4px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.6s var(--ease);
}

.c-header_logo {
  position: relative;
}

.c-header_cta:hover::after,
.c-header_logo:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* ——— Dialog ——— */
.c-jack {
  position: fixed;
  inset: 0;
  z-index: 5;
  pointer-events: none;
  display: flex;
  align-items: center;
  padding: 120px var(--gutter);
}

.c-jack_dialog {
  width: min(470px, 36vw);
  pointer-events: auto;
}

.c-jack_previous {
  margin: 0 0 44px;
  font-size: clamp(17px, 1.3vw, 20px);
  line-height: 1.18;
  filter: blur(3px);
  opacity: 0.55;
  transition: opacity 0.6s var(--ease), filter 0.6s var(--ease);
  min-height: 1px;
  user-select: none;
}

.c-jack_previous:empty {
  margin-bottom: 0;
}

.c-jack_line {
  margin: 0;
  font-size: clamp(21px, 1.72vw, 27px);
  line-height: 1.13;
  font-weight: 400;
}

.c-jack_line em {
  font-style: italic;
}

.c-jack.-compact .c-jack_line {
  font-size: clamp(19px, 1.45vw, 23px);
}

.c-jack.-long .c-jack_line {
  font-size: clamp(18px, 1.38vw, 22px);
  line-height: 1.2;
}

.c-char {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.35em);
  filter: blur(4px);
  animation: charIn 0.6s var(--ease) forwards;
  white-space: pre;
}

.c-word {
  display: inline-block;
  white-space: nowrap;
}

@keyframes charIn {
  to {
    opacity: 1;
    transform: none;
    filter: blur(0);
  }
}

.c-jack_controls {
  margin-top: 30px;
}

.c-jack_controls:empty {
  margin-top: 0;
}

.c-reveal {
  opacity: 0;
  transform: translateY(10px);
  animation: revealIn 0.7s var(--ease) forwards;
}

@keyframes revealIn {
  to {
    opacity: 1;
    transform: none;
  }
}

/* Choices */
.c-choices {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-width: 440px;
}

.c-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 34px;
  padding: 8px 18px 9px;
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.15;
  text-decoration: none;
  text-align: left;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04), 0 8px 24px -12px rgba(0, 0, 0, 0.3);
  transition: background 0.35s var(--ease), color 0.35s var(--ease), transform 0.35s var(--ease);
}

.c-button:hover,
.c-button:focus-visible {
  background: var(--ink);
  color: var(--paper);
}

.c-button:active {
  transform: scale(0.97);
}

.c-button:focus-visible,
.c-round:focus-visible,
.c-sound button:focus-visible,
.c-header_cta:focus-visible,
.c-header_logo:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.c-button.-secondary {
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.75);
}

.c-button.-secondary:hover {
  background: rgba(255, 255, 255, 0.4);
  color: var(--ink);
}

.c-button.-dark {
  background: var(--ink);
  color: var(--paper);
}

.c-button.-dark:hover {
  background: #2c2c30;
}

.c-button svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  flex: none;
}

.c-button.-external::after {
  content: '↗';
  font-size: 12px;
}

/* Form */
.c-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-width: 440px;
}

.c-form_row {
  display: flex;
  align-items: flex-end;
  gap: 14px;
}

.c-field {
  position: relative;
  flex: 1;
  display: block;
}

.c-field_label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
  margin-bottom: 4px;
  transition: color 0.3s;
}

.c-field_input {
  width: 100%;
  appearance: none;
  border: 0;
  border-bottom: 1px solid rgba(17, 17, 19, 0.35);
  border-radius: 0;
  background: transparent;
  padding: 8px 0 10px;
  font: inherit;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--ink);
  outline: none;
  transition: border-color 0.3s var(--ease);
}

.c-field_input::placeholder {
  color: rgba(17, 17, 19, 0.35);
}

.c-field_input:focus {
  border-bottom-color: var(--ink);
}

textarea.c-field_input {
  resize: none;
  min-height: 92px;
  max-height: 32vh;
  line-height: 1.25;
  font-size: 18px;
}

.c-field.-invalid .c-field_input {
  border-bottom-color: #c2361b;
}

.c-field.-invalid .c-field_label {
  color: #c2361b;
}

.c-field_error {
  position: absolute;
  right: 0;
  top: 0;
  font-size: 12px;
  color: #c2361b;
}

.c-checks {
  border: 0;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.c-checks legend {
  font-size: 12px;
  color: var(--ink-soft);
  margin-bottom: 10px;
  padding: 0;
}

.c-check {
  position: relative;
}

.c-check input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.c-check span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px 9px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.45);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

.c-check span::before {
  content: '';
  width: 12px;
  height: 12px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1px currentColor;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.c-check input:checked + span {
  background: var(--ink);
  color: var(--paper);
}

.c-check input:checked + span::before {
  background: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.c-check input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.c-next {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: inline-grid;
  place-items: center;
  font-size: 20px;
  transition: transform 0.4s var(--ease), background 0.3s;
}

.c-next:hover {
  transform: translateX(3px);
  background: #2c2c30;
}

.c-next.-ghost {
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
}

.c-next.-ghost:hover {
  background: var(--paper);
}

.c-link {
  font-size: 13px;
  text-decoration: underline;
  text-underline-offset: 0.2em;
  color: var(--ink-soft);
  align-self: flex-start;
}

.c-link:hover {
  color: var(--ink);
}

.c-auto {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--ink-soft);
}

.c-auto_bar {
  width: 60px;
  height: 2px;
  background: rgba(17, 17, 19, 0.15);
  overflow: hidden;
  border-radius: 2px;
}

.c-auto_bar i {
  display: block;
  height: 100%;
  background: var(--ink);
  transform-origin: left;
  transform: scaleX(0);
}

/* Recap */
.c-recap {
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 18px;
  padding: 20px 22px 18px;
  max-width: 440px;
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.35);
}

.c-recap_title {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 12px;
  font-weight: 500;
}

.c-recap dl {
  margin: 0;
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 8px 14px;
  font-size: 14px;
  line-height: 1.3;
  max-height: 30vh;
  overflow: auto;
}

.c-recap dt {
  color: var(--ink-soft);
}

.c-recap dd {
  margin: 0;
  overflow-wrap: anywhere;
  white-space: pre-line;
}

.c-recap_actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 18px;
}

/* ——— Round buttons, sound, progress ——— */
.c-round {
  position: fixed;
  z-index: 12;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  display: grid;
  place-items: center;
  transition: transform 0.4s var(--ease), opacity 0.4s var(--ease);
}

.c-round svg,
.c-sound svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.c-round:hover {
  transform: scale(1.06);
}

.c-back {
  left: var(--gutter);
  bottom: 40px;
}

.c-back[hidden] {
  display: grid;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.8);
}

.c-sound {
  position: fixed;
  z-index: 12;
  right: var(--gutter);
  bottom: 40px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 3px;
  border-radius: 999px;
  background: var(--ink);
}

.c-sound button {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--paper);
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
}

.c-sound button.is-active {
  background: var(--paper);
  color: var(--ink);
}

.c-progress {
  position: fixed;
  z-index: 12;
  left: 0;
  bottom: 0;
  height: 4px;
  width: 100%;
  background: var(--ink);
  transform-origin: left;
  transform: scaleX(var(--progress, 0));
  transition: transform 1.2s var(--ease);
}

.c-toast {
  position: fixed;
  z-index: 30;
  left: 50%;
  bottom: 44px;
  transform: translate(-50%, 20px);
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  padding: 10px 16px;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease), transform 0.5s var(--ease);
  white-space: nowrap;
  max-width: calc(100vw - 32px);
  overflow: hidden;
  text-overflow: ellipsis;
}

.c-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ——— Disclaimer ——— */
.c-disclaimer {
  position: fixed;
  z-index: 11;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.01em;
  color: var(--ink-soft);
  white-space: nowrap;
  pointer-events: none;
}

/* ——— Note (brief helper) ——— */
.c-note {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: flex;
  justify-content: flex-start;
  background: rgba(17, 17, 19, 0.25);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s var(--ease);
}

.c-note.is-active {
  opacity: 1;
  pointer-events: auto;
}

.c-note_panel {
  position: relative;
  width: min(560px, 100%);
  height: 100%;
  overflow: auto;
  background: #f3f3f4;
  padding: 90px 48px 60px;
  transform: translateX(-100%);
  transition: transform 0.8s var(--ease);
}

.c-note.is-active .c-note_panel {
  transform: none;
}

.c-note_close {
  position: absolute;
  top: 26px;
  right: 26px;
}

.c-note h2 {
  font-weight: 400;
  font-size: 36px;
  line-height: 1;
  letter-spacing: -0.04em;
  margin: 0 0 16px;
}

.c-note p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.4;
}

.c-note ol {
  list-style: none;
  counter-reset: brief;
  padding: 0;
  margin: 36px 0 0;
}

.c-note li {
  counter-increment: brief;
  display: grid;
  grid-template-columns: 38px 1fr;
  padding: 16px 0;
  border-top: 1px solid rgba(17, 17, 19, 0.12);
}

.c-note li::before {
  content: counter(brief, decimal-leading-zero);
  font-size: 12px;
  color: var(--ink-soft);
  padding-top: 3px;
}

.c-note h3 {
  font-weight: 500;
  font-size: 16px;
  margin: 0 0 4px;
}

/* ——— Loader ——— */
.c-loader {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: #0b0b0c;
  color: #f2f2f2;
  display: grid;
  place-items: center;
  transition: clip-path 1.3s var(--ease-in-out);
  clip-path: inset(0 0 0 0);
}

html.is-ready .c-loader {
  clip-path: inset(0 0 100% 0);
  pointer-events: none;
}

.c-loader_text {
  font-size: clamp(18px, 1.8vw, 26px);
  line-height: 1.2;
  white-space: pre;
  font-variant-ligatures: none;
}

.c-loader_text span {
  display: block;
}

.c-loader_count {
  position: absolute;
  right: var(--gutter);
  bottom: 34px;
  font-size: 13px;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  color: rgba(242, 242, 242, 0.55);
}

.c-noscript {
  position: fixed;
  inset: auto 16px 50% 16px;
  text-align: center;
  z-index: 200;
}

/* ——— Mobile ——— */
@media (max-width: 820px), (max-aspect-ratio: 9/10) {
  :root {
    --gutter: 16px;
  }

  .c-header {
    padding: 18px var(--gutter);
    font-size: 20px;
  }

  .c-header_status {
    display: none;
  }

  .c-header_nav {
    gap: 16px;
  }

  .c-disclaimer {
    bottom: auto;
    top: 46px;
    font-size: 10px;
    white-space: normal;
    width: calc(100% - 32px);
    text-align: center;
  }

  .c-stage {
    -webkit-mask-image: linear-gradient(to bottom, #000 48%, transparent 74%);
    mask-image: linear-gradient(to bottom, #000 48%, transparent 74%);
  }

  .c-jack {
    align-items: flex-end;
    padding: 0;
  }

  .c-jack_dialog {
    width: 100%;
    padding: 64px var(--gutter) 84px;
    background: linear-gradient(to bottom, rgba(160, 162, 167, 0) 0%, rgba(160, 162, 167, 0.55) 40%, rgba(150, 152, 157, 0.75) 100%);
    max-height: 72vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .c-jack_previous {
    display: none;
  }

  .c-jack_line,
  .c-jack.-compact .c-jack_line {
    font-size: 21px;
  }

  .c-jack.-long .c-jack_line {
    font-size: 18px;
  }

  .c-jack_controls {
    margin-top: 20px;
  }

  .c-button {
    font-size: 14px;
  }

  .c-back {
    bottom: 22px;
  }

  .c-sound {
    bottom: 22px;
    flex-direction: row;
  }

  .c-sound button {
    width: 32px;
    height: 32px;
  }

  .c-back {
    width: 38px;
    height: 38px;
  }

  .c-toast {
    bottom: 80px;
  }

  .c-note_panel {
    padding: 80px 24px 40px;
  }

  .c-recap dl {
    grid-template-columns: 80px 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .c-char,
  .c-reveal {
    animation-duration: 0.01s !important;
    animation-delay: 0s !important;
  }
}

/* Dark variant (html.theme-dark): the glow needs a night to live in */
html.theme-dark {
  --ink: #eef0f4;
  --ink-soft: rgba(238, 240, 244, 0.55);
  --paper: #0b0f17;
}
html.theme-dark body {
  background: radial-gradient(120% 95% at 64% 40%, #122240 0%, #0a1226 38%, #050a16 72%, #03060d 100%) fixed;
  background-color: #060a14;
}

/* QUANTUM DATA: the engine link sits bottom centre */
.c-engine {
  position: fixed;
  z-index: 11;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  letter-spacing: 0.04em;
  font-size: 26px;
  min-height: 68px;
  padding: 20px 44px 22px;
}
.c-engine:active { transform: translateX(-50%) scale(0.97); }
html.theme-dark .c-engine { box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 10px 30px -14px rgba(59, 140, 255, 0.6); }
@media (max-width: 820px) {
  .c-engine { bottom: 16px; }
}