:root {
  --bg: #f2efe8;
  --ink: #1d1b18;
  --panel: #fffaf0;
  --line: #d9ccb6;
  --accent: #c24d2c;
  --accent-2: #225d7d;
  --surface: #fff;
  --bg-fx-1: #f9e5c8;
  --bg-fx-2: #dbe9f1;
  --shadow: rgba(0, 0, 0, 0.06);
  --canvas-bg: #fff;
  --canvas-grid-minor: #ece1d2;
  --canvas-grid-major: #d4c6b2;
  --canvas-axis: #9b8f7a;
  --canvas-label: #6a5f4f;
  --canvas-spectrum: rgba(194, 77, 44, 0.62);
  --canvas-response: #225d7d;
  --canvas-node-stroke: #fff;
  --canvas-focus-hp: 138, 79, 31;
  --canvas-focus-low: 194, 77, 44;
  --canvas-focus-mid: 34, 93, 125;
  --canvas-focus-high: 59, 125, 68;
  --canvas-focus-lp: 106, 74, 165;
  --canvas-node-hp: #8a4f1f;
  --canvas-node-low: #c24d2c;
  --canvas-node-mid: #225d7d;
  --canvas-node-high: #3b7d44;
  --canvas-node-lp: #6a4aa5;
  color-scheme: light;
}

:root[data-resolved-theme="dark"] {
  --bg: #14181c;
  --ink: #e8ecef;
  --panel: #1d242b;
  --line: #344352;
  --accent: #de775a;
  --accent-2: #67a8d1;
  --surface: #24303a;
  --bg-fx-1: #3f2a1f;
  --bg-fx-2: #1d3342;
  --shadow: rgba(0, 0, 0, 0.35);
  --canvas-bg: #161d23;
  --canvas-grid-minor: #31404d;
  --canvas-grid-major: #425567;
  --canvas-axis: #7f95aa;
  --canvas-label: #b8c5d0;
  --canvas-spectrum: rgba(222, 119, 90, 0.78);
  --canvas-response: #8fc0e1;
  --canvas-node-stroke: #e2ebf2;
  --canvas-focus-hp: 211, 143, 90;
  --canvas-focus-low: 222, 119, 90;
  --canvas-focus-mid: 103, 168, 209;
  --canvas-focus-high: 119, 181, 128;
  --canvas-focus-lp: 162, 133, 215;
  --canvas-node-hp: #d38f5a;
  --canvas-node-low: #de775a;
  --canvas-node-mid: #67a8d1;
  --canvas-node-high: #77b580;
  --canvas-node-lp: #a285d7;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 10%, var(--bg-fx-1) 0%, transparent 35%),
    radial-gradient(circle at 88% 90%, var(--bg-fx-2) 0%, transparent 35%),
    var(--bg);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
}

.app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 1rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
}

.hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.hero p {
  margin-top: 0.25rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1;
  padding: 0.45rem 0.55rem;
  cursor: pointer;
  transition:
    background-color 0.18s ease,
    border-color 0.18s ease,
    color 0.18s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--surface));
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 2px;
}

.theme-toggle-icon {
  width: 1rem;
  height: 1rem;
}

.theme-toggle-label {
  display: none;
}

@media (min-width: 680px) {
  .theme-toggle-label {
    display: inline;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem;
  margin-top: 1rem;
  box-shadow: 0 8px 24px var(--shadow);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

.panel-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.panel-controls label {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
}

.panel-controls select {
  padding: 0.2rem 0.45rem;
  width: auto;
  min-width: 90px;
  font-weight: 400;
}

h2 {
  margin: 0;
  font-size: 1.1rem;
}

.row {
  display: grid;
  gap: 0.75rem;
}

.row {
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  align-items: center;
}

.transport .row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1rem;
  align-items: end;
}

.transport .row > label {
  flex: 1 1 180px;
  min-width: 160px;
}

label {
  display: grid;
  gap: 0.2rem;
  font-size: 0.92rem;
}

input[type="range"] {
  width: 100%;
}

button {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 10px;
  padding: 0.55rem 0.75rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--ink);
}

select {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  padding: 0.35rem 0.45rem;
  background: var(--surface);
  color: var(--ink);
}

button.primary {
  background: var(--accent-2);
  border-color: var(--accent-2);
  color: #fff;
}

button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.icon-btn {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  padding: 0;
  display: grid;
  place-items: center;
  position: relative;
  flex: 0 0 auto;
  align-self: center;
}

.icon {
  position: absolute;
  width: 0.9rem;
  height: 0.9rem;
}

.icon-play {
  clip-path: polygon(18% 10%, 18% 90%, 88% 50%);
  background: currentColor;
}

.icon-stop {
  width: 0.76rem;
  height: 0.76rem;
  background: currentColor;
  border-radius: 2px;
  opacity: 0;
}

.icon-btn.active .icon-play {
  opacity: 0;
}

.icon-btn.active .icon-stop {
  opacity: 1;
}

.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;
}

.steps {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0.45rem;
}

.step {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.5rem;
  background: var(--surface);
  transition:
    transform 0.12s ease,
    box-shadow 0.12s ease;
}

.step.current {
  transform: translateY(-2px);
  box-shadow: 0 0 0 2px #c24d2c55;
}

.step-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.25rem;
  font-size: 0.86rem;
}

.step input[type="checkbox"] {
  transform: scale(1.1);
}

.step select {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  padding: 0.25rem;
}

.eq-panel {
  display: grid;
  gap: 0.75rem;
}

.eq-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.eq-head h2 {
  margin: 0;
}

.eq-readout {
  margin: 0;
  font-size: 0.88rem;
  text-align: right;
}

#eq-canvas {
  width: 100%;
  height: 400px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--canvas-bg);
  touch-action: none;
}

.eq-context-menu {
  position: fixed;
  z-index: 1000;
  min-width: 320px;
  padding: 0.4rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
}

.eq-context-menu-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 1px minmax(0, 1fr);
  gap: 0.5rem;
  align-items: start;
}

.eq-context-menu-col {
  min-width: 0;
}

.eq-context-menu-divider {
  align-self: stretch;
  background: var(--line);
  border-radius: 1px;
}

.eq-context-menu-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 0.2rem 0.4rem 0.3rem;
}

.eq-context-menu-section {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding: 0.45rem 0.4rem 0.2rem;
}

.eq-context-menu-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: 7px;
  padding: 0.42rem 0.55rem;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.86rem;
  cursor: pointer;
}

.eq-context-menu-item:hover {
  background: rgba(194, 77, 44, 0.1);
}

.eq-context-menu-item.is-active {
  background: rgba(34, 93, 125, 0.16);
  font-weight: 600;
}

.eq-context-order {
  margin-top: 0.35rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--line);
}

.eq-context-order-select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  padding: 0.35rem 0.45rem;
  font: inherit;
}

.eq-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  align-items: center;
}

.analyzer-band {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  padding: 0.75rem;
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.analyzer-band label {
  margin: 0;
}

.effects-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.fx-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem;
  background: var(--surface);
  display: grid;
  gap: 0.45rem;
  align-content: start;
}

.fx-card label:not(.fx-toggle) {
  grid-template-columns: 1fr auto;
  align-items: baseline;
}

.fx-card label:not(.fx-toggle) span:last-child {
  grid-column: 2;
  grid-row: 1;
  text-align: right;
  font-size: 0.82rem;
  font-weight: 400;
  opacity: 0.8;
}

.fx-card label:not(.fx-toggle) input[type="range"] {
  grid-column: span 2;
  grid-row: 2;
}

.fx-mode {
  gap: 0.5rem;
}

.fx-mode select {
  min-width: 9rem;
}

.fx-option {
  display: grid;
  gap: 0.45rem;
}

.fx-option[hidden] {
  display: none;
}

.fx-option-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.2rem;
}

.fx-toggle-row {
  display: flex !important;
  flex-direction: row !important;
  justify-content: space-between;
  align-items: center;
  padding: 0.2rem 0;
}

.fx-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.2rem;
}

.fx-head h3 {
  margin: 0;
  font-size: 1rem;
}

.fx-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
}

/* ---- Effect Chain Canvas ---- */

.chain-panel {
  display: grid;
  gap: 0.75rem;
}

.chain-head {
  display: grid;
  gap: 0.35rem;
}

.chain-head-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.chain-head-top h2 {
  margin: 0;
}

.chain-shortcuts-wrap {
  position: relative;
}

.chain-shortcuts-toggle {
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.chain-shortcuts-toggle:hover,
.chain-shortcuts-toggle[aria-expanded="true"] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
}

.chain-shortcuts-popover {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  width: min(22rem, 80vw);
  z-index: 20;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  padding: 0.55rem 0.65rem;
  box-shadow: 0 8px 24px var(--shadow);
}

.chain-shortcuts-title {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  opacity: 0.8;
}

.chain-shortcuts-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.25rem;
}

.chain-shortcuts-list li {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
}

.chain-shortcuts-list li span {
  margin-left: auto;
  opacity: 0.75;
}

.chain-shortcuts-list kbd {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: color-mix(in srgb, var(--surface) 86%, var(--line));
  color: var(--ink);
  font-size: 0.72rem;
  font-family: inherit;
  line-height: 1;
  padding: 0.18rem 0.35rem;
}

.chain-hint {
  margin: 0;
  font-size: 0.82rem;
  opacity: 0.65;
}

.chain-canvas-wrap {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--canvas-bg);
}

#chain-canvas {
  width: 100%;
  height: 540px;
  display: block;
  touch-action: none;
}

.chain-detail {
  animation: chain-detail-in 0.18s ease;
}

@keyframes chain-detail-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.chain-detail-inner {
  display: grid;
  grid-template-columns: 1fr;
}

.chain-detail-card {
  display: grid;
  gap: 0.45rem;
}

.chain-detail-card[hidden] {
  display: none;
}

/* ---- Pin-to-block button ---- */

.pin-label-wrap {
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

.pin-param {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  vertical-align: middle;
  width: 18px;
  height: 18px;
  margin-left: 4px;
  padding: 0;
  border: none;
  border-radius: 3px;
  background: transparent;
  cursor: pointer;
  opacity: 0.35;
  transition:
    opacity 0.15s,
    background 0.15s;
}

.pin-param:hover {
  opacity: 0.7;
  background: var(--surface-hover, rgba(128, 128, 128, 0.1));
}

.pin-param.pinned {
  opacity: 1;
  color: var(--accent);
}

.pin-param svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
}

/* ---- Chain Context Menu ---- */

.chain-context-menu {
  position: fixed;
  z-index: 1000;
  min-width: 180px;
  padding: 0.35rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
}

.chain-menu-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0.55;
  padding: 0.3rem 0.55rem 0.25rem;
}

.chain-menu-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: 7px;
  padding: 0.42rem 0.55rem;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.86rem;
  cursor: pointer;
}

.chain-menu-item:hover:not(:disabled) {
  background: rgba(194, 77, 44, 0.1);
}

.chain-menu-item--submenu {
  position: relative;
  padding-right: 1.4rem;
}

.chain-menu-item--submenu::after {
  content: "›";
  position: absolute;
  right: 0.55rem;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.55;
}

.chain-context-submenu {
  min-width: 190px;
}

.chain-menu-item--disabled {
  opacity: 0.35;
  cursor: default;
}

.chain-menu-item--danger {
  color: #c24d2c;
}

.chain-menu-item--danger:hover {
  background: rgba(194, 77, 44, 0.12);
}

.dynamics-grid {
  grid-template-areas:
    "comp visuals"
    "comp lim";
}

.comp-card {
  grid-area: comp;
}

.visuals-card {
  grid-area: visuals;
}

.lim-card {
  grid-area: lim;
}

.dynamics-plots {
  display: flex;
  gap: 1rem;
  justify-content: space-around;
  padding: 0.5rem 0;
}

.plot-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
}

.plot-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0.7;
}

.dynamics-plots canvas {
  background: var(--canvas-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  max-width: 100%;
  height: auto;
}

/* ---- Chebyshev waveshaper detail layout ---- */
.dist-cheb-layout {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
}

.dist-cheb-params {
  flex: 1;
  min-width: 0;
}

.dist-cheb-viz {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  flex-shrink: 0;
}

.dist-cheb-viz canvas {
  background: var(--canvas-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  max-width: 100%;
  height: auto;
}

@media (max-width: 720px) {
  .dynamics-grid {
    grid-template-areas: none;
    display: flex;
    flex-direction: column;
  }

  .eq-meta {
    grid-template-columns: 1fr;
  }

  .eq-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .eq-readout {
    text-align: left;
  }

  .hero-top {
    align-items: flex-start;
  }

  .effects-grid {
    grid-template-columns: 1fr;
  }

  .chain-head {
    align-items: flex-start;
    flex-direction: column;
  }
}