:root {
  color-scheme: dark;
  --ink: #f2f4ea;
  --muted: #93988a;
  --muted-strong: #b8bdaf;
  --acid: #c8ff4d;
  --acid-soft: rgba(200, 255, 77, 0.12);
  --violet: #b18cff;
  --coral: #ff8c67;
  --night: #0c0e0b;
  --surface: #131611;
  --surface-2: #191d17;
  --surface-3: #20251d;
  --line: rgba(239, 244, 228, 0.11);
  --line-strong: rgba(239, 244, 228, 0.2);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 24px;
  --font-sans: Inter, "Avenir Next", Avenir, ui-sans-serif, system-ui, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", ui-monospace, monospace;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--night);
}

body {
  min-height: 100dvh;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 44% -10%, rgba(200, 255, 77, 0.07), transparent 28rem),
    radial-gradient(circle at 105% 60%, rgba(166, 150, 255, 0.06), transparent 28rem),
    var(--night);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

button,
select {
  color: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--acid);
  outline-offset: 3px;
}

.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;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--night);
  background: var(--acid);
  border-radius: 8px;
  transform: translateY(-150%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.app-header {
  height: 60px;
  padding: 0 clamp(18px, 3vw, 44px);
  display: flex;
  align-items: center;
  gap: 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(12, 14, 11, 0.84);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.brand-mark {
  width: 31px;
  height: 31px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3px;
  border-radius: 9px;
  background: var(--acid);
}

.brand-mark i {
  display: block;
  width: 3px;
  border-radius: 99px;
  background: var(--night);
  animation: brand-wave 1.8s ease-in-out infinite;
}

.brand-mark i:nth-child(1) { height: 9px; }
.brand-mark i:nth-child(2) { height: 17px; animation-delay: -0.25s; }
.brand-mark i:nth-child(3) { height: 12px; animation-delay: -0.5s; }

@keyframes brand-wave {
  0%, 100% { transform: scaleY(0.7); }
  50% { transform: scaleY(1); }
}

.brand-line {
  flex: 1;
  color: var(--muted);
  font-size: 13px;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted-strong);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
  box-shadow: 0 0 0 4px rgba(147, 152, 138, 0.09);
}

.header-status.ready .status-dot {
  background: var(--acid);
  box-shadow: 0 0 0 4px var(--acid-soft);
}

.workspace {
  width: min(1680px, 100%);
  height: calc(100dvh - 60px);
  margin: 0 auto;
  padding: 12px clamp(12px, 1.6vw, 26px) 16px;
}

.workspace-shell {
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.eyebrow {
  display: block;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.icon-button,
.transport-button,
.text-button {
  border: 0;
  transition: border-color 150ms ease, background 150ms ease, color 150ms ease, transform 150ms ease;
}

.icon-button:active,
.transport-button:active {
  transform: translateY(1px);
}

.transport-button:hover,
.icon-button:hover:not(:disabled) {
  border-color: rgba(200, 255, 77, 0.4);
  background: var(--surface-3);
}

.icon-button {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  color: var(--muted-strong);
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: var(--surface-2);
}

.icon-button:disabled {
  cursor: not-allowed;
  opacity: 0.38;
}

.icon-button svg {
  width: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.icon-button.small { width: 32px; height: 32px; flex: 0 0 auto; }

.stage-grid {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: minmax(225px, 0.8fr) minmax(520px, 2.4fr) minmax(260px, 0.95fr);
  min-height: 0;
  overflow: hidden;
  background: var(--surface);
}

.control-rail,
.collaboration-rail {
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: rgba(16, 19, 15, 0.82);
}

.control-rail { border-right: 1px solid var(--line); }
.collaboration-rail { border-left: 1px solid var(--line); }

.rail-section {
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
}

.section-heading,
.activity-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mini-value {
  color: var(--muted-strong);
  font-size: 10px;
}

.instrument-section {
  position: relative;
  z-index: 5;
  overflow: visible;
  padding: 14px 18px;
}

.instrument-menu { position: relative; }

.instrument-picker {
  position: relative;
  width: 100%;
  min-width: 0;
  display: grid;
  grid-template-columns: 33px 1fr 18px;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  color: var(--ink);
  border: 1px solid rgba(200, 255, 77, 0.28);
  border-radius: 11px;
  background: var(--acid-soft);
  cursor: pointer;
  text-align: left;
  transition: border-color 150ms ease, background 150ms ease;
}

.instrument-picker:hover {
  border-color: rgba(200, 255, 77, 0.5);
  background: rgba(200, 255, 77, 0.16);
}

.instrument-picker:focus-within {
  outline: 2px solid var(--acid);
  outline-offset: 3px;
}

.instrument-options {
  position: absolute;
  z-index: 20;
  top: calc(100% + 7px);
  right: 0;
  left: 0;
  width: 100%;
  display: grid;
  gap: 3px;
  padding: 6px;
  overflow: hidden;
  color: var(--ink);
  border: 1px solid rgba(200, 255, 77, 0.28);
  border-radius: 11px;
  background: #171b15;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
}

.instrument-options[hidden] { display: none; }

.instrument-option {
  width: 100%;
  display: grid;
  gap: 2px;
  padding: 8px 10px;
  color: var(--muted-strong);
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  text-align: left;
}

.instrument-option:hover,
.instrument-option:focus-visible {
  color: var(--ink);
  border-color: var(--line);
  background: var(--surface-3);
  outline: none;
}

.instrument-option.selected {
  color: var(--ink);
  border-color: rgba(200, 255, 77, 0.24);
  background: var(--acid-soft);
}

.instrument-option strong {
  font-size: 11px;
  font-weight: 650;
}

.instrument-option small {
  color: var(--muted);
  font-size: 9px;
}

.instrument-current strong,
.instrument-current small { display: block; }
.instrument-current strong { font-size: 11px; font-weight: 650; }
.instrument-current small { margin-top: 2px; color: var(--muted); font-size: 9px; }

.select-chevron {
  color: var(--acid);
  font-size: 17px;
  line-height: 1;
  text-align: center;
  transition: transform 150ms ease;
}

.instrument-menu.open .select-chevron { transform: rotate(180deg); }

.instrument-glyph {
  width: 33px;
  height: 33px;
  display: grid;
  place-items: center;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  background: var(--surface-2);
  font-family: Georgia, serif;
  font-size: 18px;
}

.instrument-picker .instrument-glyph {
  color: var(--night);
  border-color: transparent;
  background: var(--acid);
}

.piano-glyph::before {
  content: "";
  width: 15px;
  height: 17px;
  border: 1.5px solid currentColor;
  background: repeating-linear-gradient(90deg, transparent 0 4px, currentColor 4px 5px);
}

.tempo-section input[type="range"] {
  --tempo-percent: 38%;
  width: 100%;
  height: 28px;
  margin: 6px 0 0;
  appearance: none;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--acid) 0 var(--tempo-percent), #343a30 var(--tempo-percent)) center / 100% 4px no-repeat;
  cursor: pointer;
}

.tempo-section input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  background: transparent;
}

.tempo-section input[type="range"]::-webkit-slider-thumb {
  width: 16px;
  height: 16px;
  margin-top: -6px;
  appearance: none;
  border: 3px solid var(--surface);
  border-radius: 50%;
  background: var(--acid);
  box-shadow: 0 0 0 1px var(--acid);
}

.tempo-section input[type="range"]::-moz-range-track {
  height: 4px;
  background: transparent;
}

.tempo-section input[type="range"]::-moz-range-thumb {
  width: 11px;
  height: 11px;
  border: 3px solid var(--surface);
  border-radius: 50%;
  background: var(--acid);
  box-shadow: 0 0 0 1px var(--acid);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  color: #6f756a;
  font-size: 8px;
}

.tonality-row {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 7px;
  margin-top: 14px;
}

.tonality-row label {
  color: var(--muted);
  font-size: 9px;
}

.tonality-row select {
  width: 100%;
  height: 35px;
  margin-top: 5px;
  padding: 0 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
  font-size: 10px;
}

.instrument-stage {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  padding: clamp(18px, 2.2vw, 30px);
  background:
    linear-gradient(rgba(200, 255, 77, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 255, 77, 0.018) 1px, transparent 1px),
    var(--surface);
  background-size: 38px 38px;
}

.stage-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

.stage-heading h1 {
  margin: 6px 0 0;
  max-width: 620px;
  font-size: clamp(29px, 3vw, 46px);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.stage-intro {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 10px;
}

#track-status.live { color: var(--acid); }

.transport { display: flex; gap: 6px; }

.transport-button {
  height: 34px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0 11px;
  color: var(--muted-strong);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(25, 29, 23, 0.8);
  font-size: 9px;
}

.transport-button[aria-pressed="true"] {
  color: var(--ink);
  border-color: rgba(200, 255, 77, 0.58);
  background: rgba(200, 255, 77, 0.16);
  box-shadow: inset 0 0 0 1px rgba(200, 255, 77, 0.12), 0 0 18px rgba(200, 255, 77, 0.08);
}

.metronome-icon {
  width: 10px;
  height: 13px;
  border: 1px solid currentColor;
  clip-path: polygon(33% 0, 67% 0, 100% 100%, 0 100%);
}

.transport-state {
  min-width: 24px;
  padding: 2px 5px;
  color: #747a6e;
  border: 1px solid var(--line);
  border-radius: 99px;
  font-family: var(--font-mono);
  font-size: 7px;
  line-height: 1.25;
  text-align: center;
  text-transform: uppercase;
}

.transport-button[aria-pressed="true"] .transport-state {
  color: var(--night);
  border-color: var(--acid);
  background: var(--acid);
}

.score-window {
  position: relative;
  min-height: 118px;
  flex: 1 1 auto;
  overflow: hidden;
  margin: clamp(14px, 2.2vh, 22px) 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(9, 11, 8, 0.55);
}

.score-lines {
  position: absolute;
  inset: 26% 0;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}

.score-lines i { height: 1px; background: rgba(239, 244, 228, 0.06); }

.playhead {
  position: absolute;
  z-index: 2;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(transparent, rgba(200, 255, 77, 0.55), transparent);
  opacity: 0.35;
}

.note-field { position: absolute; inset: 0; overflow: hidden; }

.score-note {
  position: absolute;
  right: -56px;
  width: 48px;
  height: 48px;
  color: var(--note-color, var(--acid));
  filter: drop-shadow(0 0 7px color-mix(in srgb, var(--note-color) 38%, transparent));
  transform: translateY(-50%);
  animation: note-travel 9s linear var(--travel-delay, 0s) forwards;
}

.score-note svg { width: 100%; height: 100%; overflow: visible; }
.score-note.human { --note-color: var(--acid); }
.score-note.agent { --note-color: var(--violet); }
.notation-head,
.notation-stem,
.notation-flag,
.notation-ledger { stroke: currentColor; stroke-width: 2.3; stroke-linecap: round; }
.notation-head.filled { fill: currentColor; }
.notation-head.open { fill: var(--surface); }
.notation-flag { fill: none; }
.notation-ledger { stroke-width: 1.5; opacity: 0.65; }
.notation-accidental {
  fill: currentColor;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 21px;
}
.score-note.pending { opacity: 0.72; }
.score-note.pending .notation-head { fill: transparent; stroke-dasharray: 2.5 2.5; }

@keyframes note-travel {
  to { transform: translate(calc(-1 * (min(70vw, 980px) + 100px)), -50%); opacity: 0; }
}

.score-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  text-align: center;
  transition: opacity 220ms ease;
}

.score-empty.hidden { opacity: 0; pointer-events: none; }
.score-empty p { margin: 12px 0 0; font-size: 12px; font-weight: 600; }

.listening-rings {
  position: relative;
  width: 42px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.listening-rings i {
  display: block;
  width: 3px;
  height: 13px;
  border-radius: 5px;
  background: var(--acid);
  animation: listen 1.5s ease-in-out infinite;
}

.listening-rings i:nth-child(2) { height: 24px; animation-delay: -0.25s; }
.listening-rings i:nth-child(3) { height: 17px; animation-delay: -0.5s; }

@keyframes listen {
  0%, 100% { transform: scaleY(0.45); opacity: 0.35; }
  50% { transform: scaleY(1); opacity: 1; }
}

.keyboard-shell {
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: #090b08;
  box-shadow: 0 18px 42px rgba(0, 0, 0, 0.3);
}

.keyboard-meta {
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  color: #73796c;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.03em;
}

kbd {
  padding: 1px 4px;
  color: var(--muted-strong);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  background: var(--surface-2);
  font-family: var(--font-mono);
  font-size: 8px;
}

.keyboard {
  position: relative;
  height: clamp(138px, 18vh, 178px);
  display: flex;
  padding: 7px;
  user-select: none;
  touch-action: none;
}

.key {
  position: relative;
  min-width: 0;
  padding: 0;
  border: 0;
  -webkit-tap-highlight-color: transparent;
}

.key.white {
  z-index: 1;
  flex: 1;
  height: 100%;
  margin: 0 1px;
  color: #25281f;
  border-radius: 3px 3px 7px 7px;
  background: linear-gradient(180deg, #f4f3e9, #d8dbcc);
  box-shadow: inset 0 -6px 0 #bcc0b1, 0 2px 0 #050605;
}

.key.black {
  position: absolute;
  z-index: 3;
  top: 7px;
  width: calc((100% - 14px) / 10 * 0.6);
  height: 60%;
  color: #7c8275;
  border: 1px solid #30352c;
  border-radius: 2px 2px 6px 6px;
  background: linear-gradient(180deg, #23271f, #0d0f0c);
  box-shadow: inset 0 -5px 0 #060806, 0 7px 10px rgba(0, 0, 0, 0.42);
  transform: translateX(-50%);
}

.key span {
  position: absolute;
  bottom: 11px;
  left: 50%;
  font-family: var(--font-mono);
  font-size: 8px;
  transform: translateX(-50%);
  pointer-events: none;
}

.key.black span { bottom: 8px; font-size: 7px; }

.key.active.white,
.key.white:active {
  background: linear-gradient(180deg, #e7ffac, var(--acid));
  box-shadow: inset 0 -3px 0 #a9d83d;
  transform: translateY(3px);
}

.key.active.black,
.key.black:active {
  color: var(--acid);
  border-color: var(--acid);
  background: #273414;
  box-shadow: inset 0 -2px 0 #0b0e08;
  transform: translate(-50%, 3px);
}

.stage-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 12px;
}

.stage-footer p {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  color: var(--muted);
  font-size: 9px;
}

.stage-footer p strong { color: var(--muted-strong); }

.pulse-mini {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--acid);
  box-shadow: 0 0 0 4px var(--acid-soft);
}

.text-button {
  padding: 5px;
  color: var(--acid);
  background: transparent;
  font-size: 9px;
}

.text-button:hover { color: #ddff8c; }

.agent-seat {
  position: relative;
  display: grid;
  grid-template-columns: 41px 1fr;
  gap: 12px;
  padding: 18px 18px 15px;
  border-bottom: 1px solid var(--line);
}

.agent-release {
  position: absolute;
  z-index: 2;
  top: 10px;
  right: 10px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  padding: 0 0 2px;
  color: #ff8176;
  border: 1px solid rgba(255, 105, 95, 0.3);
  border-radius: 7px;
  background: rgba(255, 92, 82, 0.06);
  font-family: var(--font-sans);
  font-size: 18px;
  line-height: 1;
  opacity: 0.78;
  transition: color 150ms ease, border-color 150ms ease, background 150ms ease, opacity 150ms ease, transform 150ms ease;
}

.agent-release[hidden] { display: none; }

.agent-release:hover,
.agent-release:focus-visible {
  color: #fff;
  border-color: rgba(255, 105, 95, 0.78);
  background: rgba(255, 82, 72, 0.72);
  opacity: 1;
}

.agent-release:focus-visible {
  outline: 2px solid rgba(255, 129, 118, 0.48);
  outline-offset: 2px;
}

.agent-release:active { transform: scale(0.94); }

.agent-orbit {
  position: relative;
  width: 41px;
  height: 41px;
  display: grid;
  place-items: center;
  color: var(--violet);
  border: 1px solid rgba(166, 150, 255, 0.35);
  border-radius: 50%;
  background: rgba(166, 150, 255, 0.09);
}

.agent-orbit::after {
  content: "";
  position: absolute;
  inset: 4px -3px;
  border: 1px solid rgba(166, 150, 255, 0.28);
  border-radius: 50%;
  transform: rotate(50deg);
}

.agent-seat h2 {
  margin: 5px 0 4px;
  font-size: 14px;
  letter-spacing: -0.025em;
}

.agent-seat p {
  margin: 0;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.55;
}

.activity-section {
  min-height: 300px;
  padding: 20px 18px;
}

.human-activity {
  min-height: 0;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 16px 18px;
}

.activity-heading h2 {
  margin: 5px 0 0;
  font-size: 13px;
}

.event-count {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 8px;
}

.activity-list {
  max-height: 310px;
  display: grid;
  align-content: start;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  overflow: auto;
  list-style: none;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.human-activity .activity-list {
  min-height: 0;
  max-height: none;
  flex: 1 1 auto;
  margin-top: 12px;
}

.activity-turn {
  display: grid;
  gap: 8px;
  padding: 10px;
  border: 1px solid rgba(200, 255, 77, 0.14);
  border-radius: 10px;
  background: rgba(200, 255, 77, 0.035);
  cursor: pointer;
  transition: border-color 150ms ease, background 150ms ease, box-shadow 150ms ease, transform 150ms ease;
}

.activity-turn:hover,
.activity-turn:focus-visible {
  border-color: rgba(200, 255, 77, 0.42);
  background: rgba(200, 255, 77, 0.075);
}

.activity-turn:focus-visible {
  outline: 2px solid rgba(200, 255, 77, 0.7);
  outline-offset: 2px;
}

.activity-turn:active { transform: translateY(1px); }

.activity-turn.replaying {
  border-color: rgba(200, 255, 77, 0.72);
  box-shadow: 0 0 0 1px rgba(200, 255, 77, 0.12), 0 0 18px rgba(200, 255, 77, 0.08);
}

.activity-turn.agent {
  border-color: rgba(166, 150, 255, 0.18);
  background: rgba(166, 150, 255, 0.045);
}

.activity-turn.agent:hover,
.activity-turn.agent:focus-visible {
  border-color: rgba(166, 150, 255, 0.5);
  background: rgba(166, 150, 255, 0.09);
}

.activity-turn.agent:focus-visible { outline-color: rgba(166, 150, 255, 0.75); }

.activity-turn.agent.replaying {
  border-color: rgba(166, 150, 255, 0.76);
  box-shadow: 0 0 0 1px rgba(166, 150, 255, 0.14), 0 0 18px rgba(166, 150, 255, 0.1);
}

.activity-turn.replaying .activity-color { animation: activity-replay-pulse 700ms ease-in-out infinite alternate; }

@keyframes activity-replay-pulse {
  from { opacity: 0.45; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1.35); }
}

.activity-turn-header {
  display: grid;
  grid-template-columns: 8px 1fr auto;
  gap: 8px;
  align-items: center;
}

.activity-color {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--acid);
}

.activity-turn.agent .activity-color { background: var(--violet); }
.activity-actor { font-size: 9px; font-weight: 650; }
.activity-time { color: #666c61; font-family: var(--font-mono); font-size: 7px; }

.activity-note-sequence {
  height: 72px;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  margin: 0;
  overflow-y: auto;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1.6;
  overflow-wrap: anywhere;
  scrollbar-width: none;
}

.activity-note-sequence::-webkit-scrollbar { display: none; }

.activity-note { white-space: nowrap; }

.activity-note:not(:last-child)::after {
  content: "·";
  margin: 0 5px;
  color: var(--muted);
}

.activity-notes-placeholder { color: var(--muted); }

.activity-turn.agent .activity-note-sequence { color: #c8beff; }

.activity-turn-summary {
  margin: 0;
  color: var(--muted);
  font-size: 8px;
  line-height: 1.4;
}

.empty-activity {
  display: grid;
  place-items: center;
  padding: 45px 0;
  color: #60665b;
  text-align: center;
}

.empty-activity span { font-family: Georgia, serif; font-size: 24px; }
.empty-activity p { margin: 9px 0 0; font-size: 9px; }

.agent-performance {
  min-height: 0;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 18px;
}

.agent-performance-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.agent-performance-heading h2 {
  margin: 5px 0 0;
  font-size: 14px;
  letter-spacing: -0.025em;
}

.agent-performance-heading h2:empty { display: none; }

.agent-playing-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  margin-top: 4px;
  border-radius: 50%;
  background: #4e534b;
  box-shadow: 0 0 0 4px rgba(147, 152, 138, 0.06);
}

.agent-playing-dot.active {
  background: var(--violet);
  box-shadow: 0 0 0 4px rgba(166, 150, 255, 0.12);
  animation: agent-pulse 780ms ease-in-out infinite alternate;
}

@keyframes agent-pulse {
  to { opacity: 0.5; transform: scale(0.72); }
}

.agent-details {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 8px;
  margin: 16px 0 12px;
}

.agent-details div {
  min-width: 0;
  padding: 10px;
  border: 1px solid rgba(166, 150, 255, 0.14);
  border-radius: 9px;
  background: rgba(166, 150, 255, 0.045);
}

.agent-details dt {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 7px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.agent-details dd {
  margin: 4px 0 0;
  overflow: hidden;
  color: var(--muted-strong);
  font-size: 9px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.agent-activity-list {
  min-height: 0;
  flex: 1 1 auto;
  margin: 0;
  padding: 0;
  overflow: auto;
  list-style: none;
  scrollbar-width: thin;
  scrollbar-color: rgba(166, 150, 255, 0.25) transparent;
}

.agent-activity-list li:not(.empty-agent-activity) {
  display: grid;
  grid-template-columns: 45px 1fr auto;
  gap: 8px;
  padding: 10px 0;
  color: var(--muted);
  border-top: 1px solid rgba(239, 244, 228, 0.06);
  font-size: 8px;
  line-height: 1.4;
}

.agent-event-note {
  color: var(--violet);
  font-family: var(--font-mono);
  font-size: 8px;
}

.agent-activity-list time {
  color: #666c61;
  font-family: var(--font-mono);
  font-size: 7px;
}

.empty-agent-activity {
  padding: 22px 0;
  color: #666c61;
  font-size: 11px;
  line-height: 1.55;
}

.agent-prompt {
  display: grid;
  grid-template-columns: 25px 1fr 32px;
  gap: 9px;
  align-items: center;
  margin: auto 14px 14px;
  padding: 13px;
  border: 1px solid rgba(166, 150, 255, 0.18);
  border-radius: 12px;
  background: rgba(166, 150, 255, 0.06);
}

.agent-prompt .spark { color: var(--violet); }
.agent-prompt strong { font-size: 10px; }
.agent-prompt p { margin: 3px 0 0; color: var(--muted); font-size: 10px; line-height: 1.45; }
.agent-prompt p span { color: var(--muted-strong); }

.toast {
  position: fixed;
  z-index: 50;
  right: 20px;
  bottom: 20px;
  max-width: min(360px, calc(100vw - 40px));
  padding: 11px 14px;
  color: var(--night);
  border-radius: 9px;
  background: var(--acid);
  box-shadow: var(--shadow);
  font-size: 11px;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.show { opacity: 1; transform: translateY(0); }

.noscript {
  position: fixed;
  inset: auto 20px 20px;
  padding: 12px;
  color: #111;
  background: #fff;
  border-radius: 8px;
  text-align: center;
}

@media (min-width: 981px) {
  body {
    height: 100dvh;
    overflow: hidden;
  }
}

@media (min-width: 981px) and (max-height: 780px) {
  .app-header { height: 56px; }
  .workspace { height: calc(100dvh - 56px); padding-top: 9px; padding-bottom: 11px; }
  .instrument-stage { padding-top: 16px; padding-bottom: 16px; }
  .stage-heading h1 { font-size: clamp(28px, 2.6vw, 40px); }
  .stage-intro { margin-top: 5px; }
  .score-window { margin-top: 12px; margin-bottom: 12px; }
  .keyboard { height: clamp(128px, 18vh, 148px); }
  .stage-footer { margin-top: 9px; }
  .rail-section { padding-top: 13px; padding-bottom: 13px; }
  .human-activity,
  .agent-performance { padding-top: 14px; padding-bottom: 14px; }
}

/* ChatGPT's split browser lands in this tablet-like range. Keep the whole
   instrument in one viewport and turn collaboration into a compact dock. */
@media (min-width: 641px) and (max-width: 1180px) {
  body {
    height: 100dvh;
    overflow: hidden;
  }

  .app-header { height: 54px; }

  .workspace {
    height: calc(100dvh - 54px);
    padding: 8px 10px 10px;
  }

  .workspace-shell {
    height: 100%;
    min-height: 0;
    border-radius: var(--radius);
  }

  .stage-grid {
    height: 100%;
    grid-template-columns: minmax(150px, 0.58fr) minmax(0, 2.35fr);
    grid-template-rows: minmax(0, 1fr) clamp(150px, 23dvh, 188px);
  }

  .control-rail {
    grid-column: 1;
    grid-row: 1;
  }

  .instrument-stage {
    grid-column: 2;
    grid-row: 1;
    overflow: hidden;
    padding: 16px clamp(14px, 2vw, 22px);
  }

  .stage-heading { gap: 12px; }
  .stage-heading h1 { font-size: clamp(27px, 4vw, 38px); }
  .score-window { min-height: 96px; margin: 10px 0; }
  .keyboard { height: clamp(120px, 16dvh, 138px); }
  .stage-footer { margin-top: 8px; }

  .rail-section { padding: 12px 14px; }
  .instrument-section { padding-top: 11px; padding-bottom: 11px; }
  .human-activity { padding: 13px 14px; }
  .human-activity .activity-list { margin-top: 9px; }

  .collaboration-rail {
    grid-row: 2;
    grid-column: 1 / -1;
    min-height: 0;
    display: grid;
    grid-template-columns: minmax(140px, 0.78fr) minmax(245px, 1.45fr) minmax(195px, 1fr);
    overflow: hidden;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .agent-seat {
    min-width: 0;
    grid-template-columns: 35px 1fr;
    gap: 10px;
    padding: 14px;
    overflow: hidden;
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }

  .agent-orbit { width: 35px; height: 35px; }
  .agent-seat h2 { margin-top: 4px; font-size: 13px; }

  .agent-performance {
    min-height: 0;
    padding: 13px 14px;
    border-right: 1px solid var(--line);
  }

  .agent-performance-heading h2 { font-size: 13px; }
  .agent-details { margin: 9px 0 7px; }
  .agent-details div { padding: 7px 9px; }

  .agent-activity-list li:not(.empty-agent-activity) {
    grid-template-columns: 40px 1fr auto;
    padding: 7px 0;
  }

  .empty-agent-activity { padding: 8px 0; }

  .agent-prompt {
    grid-column: 3;
    align-self: center;
    margin: 12px;
    padding: 11px;
  }
}

@media (min-width: 641px) and (max-width: 760px) {
  .brand-line { display: none; }
  .header-status { margin-left: auto; }
  .instrument-current small { display: none; }
  .agent-seat { grid-template-columns: 31px 1fr; padding-right: 10px; }
  .agent-orbit { width: 31px; height: 31px; }
  .agent-seat p { display: none; }
  .agent-prompt { grid-template-columns: 1fr 32px; gap: 7px; margin: 9px; padding: 9px; }
  .agent-prompt .spark { display: none; }
  .agent-prompt p { font-size: 9px; }
}

@media (min-width: 641px) and (max-width: 1180px) and (max-height: 700px) {
  .stage-grid { grid-template-rows: minmax(0, 1fr) 136px; }
  .instrument-stage { padding-top: 12px; padding-bottom: 12px; }
  .stage-intro { display: none; }
  .score-window { min-height: 74px; margin: 8px 0; }
  .keyboard { height: 108px; }
  .stage-footer { margin-top: 6px; }
  .agent-seat { padding: 11px 13px; }
  .agent-performance { padding: 10px 13px; }
  .agent-details { margin-top: 7px; }
  .agent-prompt { margin: 9px 11px; padding: 9px 10px; }
}

@media (max-width: 640px) {
  .app-header { height: 59px; }
  .brand-line { display: none; }
  .header-status { margin-left: auto; }
  .workspace { padding: 10px; }
  .workspace-shell { min-height: 0; border-radius: var(--radius); }
  .stage-grid { display: flex; flex-direction: column; min-height: auto; overflow: visible; }
  .control-rail { order: 2; border-top: 1px solid var(--line); border-right: 0; }
  .rail-section { padding: 18px; }
  .instrument-stage { order: 1; padding: 22px 14px; }
  .stage-heading h1 { font-size: 34px; }
  .score-window { min-height: 150px; margin: 26px 0 18px; }
  .keyboard { height: 165px; }
  .keyboard-meta span:first-child { display: none; }
  .keyboard-meta { justify-content: flex-end; }
  .stage-footer { align-items: flex-start; flex-direction: column; }
  .collaboration-rail { order: 3; display: block; border-top: 1px solid var(--line); }
  .agent-seat { border-right: 0; border-bottom: 1px solid var(--line); }
  .human-activity { min-height: 260px; }
  .agent-performance { min-height: 280px; }
  .agent-prompt { margin: 0 14px 14px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}