:root {
  --seq-bg: oklch(13% 0.018 215);
  --seq-panel: oklch(18% 0.024 210 / 0.9);
  --seq-line: oklch(38% 0.035 200 / 0.55);
  --seq-text: oklch(92% 0.018 155);
  --seq-muted: oklch(73% 0.025 190);
  --seq-teal: oklch(78% 0.12 175);
  --seq-copper: oklch(72% 0.12 45);
  --seq-violet: oklch(60% 0.11 315);
}
.sequence-body {
  overflow: hidden;
  background: var(--seq-bg);
}
.sequence-shell {
  height: 100dvh;
  min-height: 660px;
  display: grid;
  grid-template-rows: 68px minmax(0, 1fr) 62px;
}
.sequence-header .brand {
  color: var(--seq-text);
}
.sequence-main {
  position: relative;
  min-height: 0;
  overflow: hidden;
  background: radial-gradient(
    circle at 50% 42%,
    oklch(24% 0.035 210),
    var(--seq-bg) 70%
  );
}
#sequence-container {
  position: absolute;
  inset: 0;
}
#sequence-container canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}
#sequence-container canvas:active {
  cursor: grabbing;
}
#sequence-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.sequence-label {
  position: absolute;
  min-width: 112px;
  padding: 7px 9px;
  color: var(--seq-text);
  background: #020b0ed6;
  border-left: 1px solid var(--seq-teal);
  font: 500 9px/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transform: translate(-50%, -100%);
  white-space: nowrap;
}
.sequence-label small {
  display: block;
  color: var(--seq-muted);
  font-size: 8px;
  letter-spacing: 0.04em;
}
.sequence-label.ring {
  border-left-color: var(--seq-copper);
}
.sequence-heading {
  position: absolute;
  z-index: 3;
  top: 28px;
  left: 28px;
  max-width: 360px;
  pointer-events: none;
}
.sequence-heading > span,
.panel-topline,
.sequence-axis,
.assembly-phase,
.sequence-help,
.sequence-transport,
.noise-fact span {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.sequence-heading > span {
  color: var(--seq-teal);
  font-size: 10px;
}
.sequence-heading h1 {
  margin: 12px 0 10px;
  color: var(--seq-text);
  font: 400 clamp(32px, 3.3vw, 54px) / 0.98 var(--serif);
  letter-spacing: -0.035em;
}
.sequence-heading p {
  margin: 0;
  max-width: 330px;
  color: var(--seq-muted);
  font-size: 14px;
  line-height: 1.55;
}
.chapter-rail {
  position: absolute;
  z-index: 4;
  left: 28px;
  top: 230px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  max-height: calc(100% - 280px);
  overflow-y: auto;
  scrollbar-width: thin;
}
.chapter-rail button {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 29px;
  padding: 4px 9px 4px 4px;
  border: 0;
  color: var(--seq-muted);
  background: transparent;
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.045em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    color 0.16s ease,
    background 0.16s ease;
}
.chapter-rail button span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 20px;
  color: var(--seq-muted);
  border: 1px solid var(--seq-line);
}
.chapter-rail button:hover,
.chapter-rail button:focus-visible {
  color: var(--seq-text);
  background: #11343461;
  outline: none;
}
.chapter-rail button.active {
  color: var(--seq-teal);
  background: #04303080;
}
.chapter-rail button.active span {
  color: #020e0f;
  background: var(--seq-teal);
  border-color: var(--seq-teal);
}
.chapter-panel {
  position: absolute;
  z-index: 4;
  top: auto;
  right: 24px;
  bottom: 74px;
  width: min(300px, 25vw);
  max-height: min(46vh, 340px);
  overflow-y: auto;
  padding: 16px;
  color: var(--seq-text);
  background: var(--seq-panel);
  border: 1px solid var(--seq-line);
  backdrop-filter: blur(12px);
  scrollbar-width: thin;
}
.panel-topline {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--seq-teal);
  font-size: 9px;
}
#chapter-count {
  color: var(--seq-muted);
}
.panel-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 16px 0;
  border-top: 1px solid var(--seq-line);
  border-bottom: 1px solid var(--seq-line);
}
.panel-stat {
  min-width: 0;
  padding: 12px 8px 12px 0;
}
.panel-stat + .panel-stat {
  padding-left: 10px;
  border-left: 1px solid var(--seq-line);
}
.panel-stat strong {
  display: block;
  color: var(--seq-text);
  font: 400 20px/1 var(--serif);
  letter-spacing: -0.01em;
  white-space: nowrap; /* keep "Hollow", "Layer 1", "Custody" on one line */
}
.panel-stat span {
  display: block;
  margin-top: 7px;
  color: var(--seq-muted);
  font: 500 8px/1.35 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.panel-copy {
  margin: 0;
  color: var(--seq-muted);
  font-size: 14px;
  line-height: 1.6;
}
.panel-copy strong {
  color: var(--seq-text);
  font-weight: 500;
}
.public-source {
  display: inline-block;
  margin-top: 14px;
  color: var(--seq-teal);
  font: 500 9px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
}
.public-source:hover {
  text-decoration: underline;
}
.sequence-axis {
  position: absolute;
  z-index: 3;
  left: 28px;
  bottom: 30px;
  display: flex;
  gap: 18px;
  color: var(--seq-muted);
  font-size: 8px;
  pointer-events: none;
}
.sequence-axis span {
  display: flex;
  align-items: center;
  gap: 6px;
}
.sequence-axis i {
  width: 18px;
  height: 2px;
}
.sequence-axis .positive {
  background: linear-gradient(90deg, #39d98a, #ffd85e);
}
.sequence-axis .zero {
  background: var(--seq-teal);
}
.sequence-axis .negative {
  background: var(--seq-violet);
}
.sequence-views {
  position: absolute;
  z-index: 5;
  top: 24px;
  right: 24px;
  display: flex;
  border: 1px solid var(--seq-line);
  background: var(--seq-panel);
}
.sequence-views button {
  min-height: 38px;
  padding: 0 12px;
  border: 0;
  border-right: 1px solid var(--seq-line);
  color: var(--seq-muted);
  background: transparent;
  font: 500 9px/1 var(--mono);
  text-transform: uppercase;
  cursor: pointer;
}
.sequence-views button:last-child {
  border-right: 0;
}
.sequence-views button:hover,
.sequence-views button:focus-visible {
  color: var(--seq-text);
  outline: none;
}
.sequence-views button.active {
  color: #020e0f;
  background: var(--seq-teal);
}
.sequence-help {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translate(-50%);
  color: var(--seq-muted);
  font-size: 8px;
  white-space: nowrap;
  pointer-events: none;
}
.assembly-phase {
  position: absolute;
  right: 26px;
  bottom: 28px;
  display: flex;
  gap: 16px;
  color: var(--seq-muted);
  font-size: 9px;
}
.assembly-phase strong {
  color: var(--seq-teal);
  font-weight: 500;
}
.sequence-transport {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 10px 22px;
  border-top: 1px solid var(--seq-line);
  background: #041012;
  color: var(--seq-muted);
  font-size: 9px;
}
.chapter-buttons {
  display: flex;
  gap: 6px;
}
.chapter-buttons button {
  min-width: 40px;
  height: 38px;
  padding: 0 14px;
  border: 1px solid var(--seq-line);
  color: var(--seq-text);
  background: transparent;
  cursor: pointer;
  font: 500 11px/1 var(--mono);
  text-transform: uppercase;
}
.chapter-buttons button:hover,
.chapter-buttons button:focus-visible {
  border-color: var(--seq-teal);
  outline: none;
}
#chapter-play {
  min-width: 88px;
  color: #020e0f;
  background: var(--seq-teal);
  border-color: var(--seq-teal);
}
.assembly-timeline {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 14px;
}
.assembly-timeline input {
  flex: 1;
  accent-color: var(--seq-teal);
}
.transport-note {
  flex: 1;
  text-align: center;
}
.transport-index {
  margin-left: auto;
  color: var(--seq-teal);
  white-space: nowrap;
}
.noise-lab {
  margin-top: 18px;
}
.noise-presets {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-bottom: 12px;
}
.noise-presets button {
  min-height: 34px;
  padding: 0 4px;
  border: 1px solid var(--seq-line);
  color: var(--seq-muted);
  background: transparent;
  font: 500 8px/1 var(--mono);
  text-transform: uppercase;
  cursor: pointer;
}
.noise-presets button.active {
  color: #020e0f;
  background: var(--seq-copper);
}
.noise-lab > p {
  color: var(--seq-muted);
  font-size: 13px;
  line-height: 1.5;
}
.noise-lab label {
  display: block;
  margin-top: 13px;
  color: var(--seq-muted);
  font: 500 9px/1.4 var(--mono);
  text-transform: uppercase;
}
.noise-lab output {
  float: right;
  color: var(--seq-text);
}
.noise-lab input {
  width: 100%;
  margin-top: 8px;
  accent-color: var(--seq-copper);
}
.noise-fact {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--seq-line);
}
.noise-fact span {
  color: var(--seq-copper);
  font-size: 8px;
}
.noise-fact strong {
  display: block;
  margin: 6px 0;
  font: 400 28px/1 var(--serif);
  color: var(--seq-copper);
}
.noise-fact p {
  margin: 0;
  color: var(--seq-muted);
  font-size: 13px;
  line-height: 1.5;
}
.basin-key {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--seq-line);
}
.basin-key > span {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0;
  color: var(--seq-muted);
  font-size: 12px;
}
.basin-key i {
  width: 22px;
  height: 8px;
}
.inner-swatch {
  background: linear-gradient(90deg, #e8b66c, #65d6c4, #9a86c8, #e9f5c5);
}
.outer-swatch {
  background: linear-gradient(90deg, #328e96, #65d6c4, #9a86c8);
}
.basin-key p {
  margin: 12px 0 0;
  color: var(--seq-muted);
  font-size: 13px;
  line-height: 1.5;
}
[hidden] {
  display: none !important;
}
@media (max-width: 1100px) {
  .chapter-panel {
    width: 270px;
    right: 16px;
  }
  .panel-stats {
    grid-template-columns: auto auto auto; /* narrow panel: size columns to the words so values never wrap */
  }
  .panel-stat {
    padding-right: 6px;
  }
  .panel-stat + .panel-stat {
    padding-left: 8px;
  }
  .panel-stat strong {
    font-size: 18px;
  }
  .sequence-heading {
    left: 20px;
    max-width: 300px;
  }
  .chapter-rail,
  .sequence-axis {
    left: 20px;
  }
  .sequence-help {
    display: none;
  }
}
@media (max-width: 760px) {
  .sequence-body {
    overflow: auto;
  }
  .sequence-shell {
    height: auto;
    min-height: 100dvh;
    grid-template-rows: 68px 720px auto;
  }
  .sequence-heading {
    top: 18px;
    left: 16px;
    max-width: 230px;
  }
  .sequence-heading h1 {
    font-size: 34px;
  }
  .sequence-heading p {
    font-size: 12px;
    max-width: 220px;
  }
  .sequence-views {
    top: 14px;
    right: 12px;
    flex-wrap: wrap;
    width: 142px;
  }
  .sequence-views button {
    min-height: 32px;
    padding: 0 9px;
    font-size: 8px;
    flex: 1 1 50%;
    border-bottom: 1px solid var(--seq-line);
  }
  .chapter-panel {
    inset: auto 12px 96px;
    width: auto;
    max-height: 225px;
    padding: 12px;
  }
  .panel-stats {
    margin: 10px 0;
    grid-template-columns: auto auto auto; /* size columns to the words so values never wrap */
  }
  .panel-stat {
    padding-top: 8px;
    padding-bottom: 8px;
  }
  .panel-stat strong {
    font-size: 18px;
  }
  .panel-copy {
    font-size: 12px;
  }
  .chapter-rail {
    inset: auto 12px 48px;
    max-height: none;
    flex-direction: row;
    overflow-x: auto;
    overflow-y: hidden;
    gap: 4px;
    padding-bottom: 4px;
  }
  .chapter-rail button {
    flex: 0 0 auto;
    min-height: 34px;
    background: var(--seq-panel);
  }
  .chapter-rail button:not(.active) {
    font-size: 0;
    gap: 0;
    padding-right: 4px;
  }
  .chapter-rail button:not(.active) span {
    font-size: 8px;
  }
  .sequence-axis {
    left: 16px;
    bottom: 16px;
    gap: 10px;
    font-size: 7px;
  }
  .assembly-phase {
    right: 14px;
    bottom: 16px;
    font-size: 7px;
  }
  .sequence-transport {
    min-height: 62px;
    padding: 10px 12px;
    gap: 10px;
    flex-wrap: wrap;
  }
  .transport-note {
    display: none;
  }
  .assembly-timeline {
    min-width: 180px;
  }
  .sequence-label {
    font-size: 7px;
    min-width: 88px;
    padding: 5px 7px;
  }
  .sequence-label small {
    display: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .chapter-rail button,
  .sequence-views button {
    transition: none;
  }
}