:root {
  --ink: #f7ead4;
  --muted: #bba98f;
  --line: #4a3931;
  --paper: #171211;
  --panel: #211917;
  --panel-strong: #2b211d;
  --surface: #181312;
  --surface-raised: #2a201d;
  --carmine: #c63c4d;
  --carmine-deep: #7f202e;
  --teal: #4b9b91;
  --teal-deep: #1e5f59;
  --gold: #d0a349;
  --indigo: #6c7ab8;
  --rose-wash: #4a242a;
  --radius: 8px;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  --soft-shadow: 0 14px 34px rgba(0, 0, 0, 0.2);
  font-family:
    Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui,
    -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: #100d0c;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

.app-shell {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: pageRise 180ms ease-out both;
}

.topbar {
  width: min(1540px, calc(100% - 32px));
  flex: 0 0 auto;
  margin: 20px auto 0;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 4px;
  border: 0;
  background: transparent;
  box-shadow: none;
  position: relative;
  overflow: hidden;
}

.topbar > * {
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  color: var(--ink);
  font-size: clamp(23px, 3vw, 34px);
  line-height: 1.1;
  white-space: nowrap;
  letter-spacing: 0;
}

.brand small {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.button,
.icon-button {
  height: 40px;
  border: 0;
  background: var(--surface-raised);
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 14px;
  cursor: pointer;
  transition:
    transform 160ms ease,
    background 160ms ease;
}

.button span,
.icon-button {
  transition: transform 180ms ease;
}

.button:hover,
.icon-button:hover {
  transform: translateY(-1px);
  background: #362925;
}

.button:active,
.icon-button:active,
.choice-button:active,
.palette-choice:active,
.control-tabs button:active,
.motif-choice span:active,
.toggles label:active {
  transform: translateY(1px) scale(0.99);
}

.button:hover span {
  transform: translateY(-1px);
}

.button:focus-visible,
.icon-button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(31, 111, 104, 0.24);
  outline-offset: 2px;
}

.button-primary {
  color: #fff7e8;
  background: var(--carmine);
  box-shadow: none;
}

.button-primary:hover {
  background: #d1495b;
}

.studio {
  width: min(1540px, calc(100% - 32px));
  margin: 10px auto 20px;
  display: grid;
  grid-template-columns: minmax(280px, 340px) minmax(420px, 1fr) minmax(280px, 360px);
  gap: 16px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.panel,
.stage {
  min-height: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  border-radius: var(--radius);
}

.panel {
  padding: 8px 10px 8px 0;
  align-self: stretch;
  height: 100%;
  overflow: auto;
  scrollbar-color: var(--carmine) var(--surface);
  scrollbar-width: thin;
  animation: softEnter 560ms ease-out both;
}

.panel::-webkit-scrollbar {
  width: 10px;
}

.panel::-webkit-scrollbar-track {
  background: transparent;
}

.panel::-webkit-scrollbar-thumb {
  background: var(--carmine);
  border: 3px solid var(--surface);
  border-radius: var(--radius);
}

.panel-head,
.stage-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}

.panel-head h2,
.control-block h3,
.culture-note h3 {
  margin: 0;
  line-height: 1.2;
}

.panel-head h2 {
  color: var(--ink);
  font-size: 20px;
  font-weight: 800;
}

.panel-head span,
.stage-toolbar span {
  color: var(--muted);
  font-size: 12px;
}

.control-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin-bottom: 18px;
}

.control-tabs button {
  min-height: 36px;
  border: 0;
  border-radius: var(--radius);
  color: var(--muted);
  background: #241b18;
  cursor: pointer;
  font-size: 13px;
  font-weight: 800;
  transition:
    background 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.control-tabs button:hover {
  color: var(--ink);
  background: #332722;
  transform: translateY(-1px);
}

.control-tabs button[aria-pressed="true"] {
  color: #fff7e8;
  background: var(--teal-deep);
}

[data-control-panel] {
  animation: panelReveal 260ms ease-out both;
}

.control-block {
  padding: 4px 0 6px;
  border-top: 0;
}

.control-block h3 {
  margin: 18px 0 12px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
}

.control-block h3:first-child {
  margin-top: 0;
}

.preset-grid,
.palette-grid,
.texture-grid,
.motif-grid,
.segmented {
  display: grid;
  gap: 8px;
}

.preset-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.palette-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.texture-grid,
.motif-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.segmented {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.choice-button,
.motif-choice,
.palette-choice {
  min-height: 46px;
  border: 0;
  background: var(--surface-raised);
  border-radius: var(--radius);
  padding: 10px 11px;
  cursor: pointer;
  text-align: left;
  transition:
    background 160ms ease,
    transform 160ms ease;
}

.choice-button:hover,
.motif-choice:hover,
.palette-choice:hover {
  transform: translateY(-1px);
  background: #342824;
  box-shadow: none;
}

.choice-button[aria-pressed="true"],
.palette-choice[aria-pressed="true"],
.motif-choice input:checked + span {
  background: var(--rose-wash);
  box-shadow: none;
  animation: selectedPop 220ms ease-out both;
}

.choice-button strong,
.palette-choice strong {
  display: block;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.motif-choice span {
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.choice-button small,
.palette-choice small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.motif-choice {
  padding: 0;
  background: transparent;
  border: 0;
}

.motif-choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.motif-choice span {
  min-height: 46px;
  display: flex;
  align-items: center;
  border: 0;
  background: var(--surface-raised);
  border-radius: var(--radius);
  padding: 10px 11px;
}

.swatches {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 4px;
  margin-top: 7px;
}

.swatches i {
  height: 12px;
  border-radius: var(--radius);
  border: 0;
}

.range-row {
  display: grid;
  grid-template-columns: 64px 1fr 42px;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 13px;
}

.range-row:last-child {
  margin-bottom: 0;
}

.range-row input {
  width: 100%;
  accent-color: var(--carmine);
}

.range-row output {
  color: var(--gold);
  text-align: right;
}

.toggles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.toggles label {
  min-height: 46px;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 0;
  background: var(--surface-raised);
  border-radius: var(--radius);
  padding: 9px 10px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
}

.toggles input {
  accent-color: var(--teal);
}

.stage {
  align-self: stretch;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 0;
  background: transparent;
  overflow: hidden;
}

.stage-toolbar {
  align-items: center;
  margin-bottom: 16px;
  flex: 0 0 auto;
  padding: 8px 0 0;
}

.stage-toolbar strong,
.stage-toolbar span {
  display: block;
}

.stage-toolbar strong {
  color: var(--ink);
  font-size: clamp(22px, 2.5vw, 30px);
  line-height: 1.1;
}

.icon-button {
  width: 40px;
  padding: 0;
  font-size: 18px;
}

.pattern-frame {
  min-height: 0;
  flex: 1;
  container-type: size;
  position: relative;
  display: grid;
  place-items: center;
  padding: clamp(10px, 2.2vw, 24px);
  border: 0;
  border-radius: var(--radius);
  background: #211917;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.pattern-frame::before,
.pattern-frame::after {
  position: absolute;
  z-index: 0;
  content: "";
  pointer-events: none;
}

.pattern-frame::before {
  inset: 12px;
  border: 1px solid rgba(208, 163, 73, 0.16);
  border-radius: var(--radius);
  animation: framePulse 4.8s ease-in-out infinite;
}

.pattern-frame.is-card-switching::before {
  animation:
    framePulse 4.8s ease-in-out infinite,
    stackPeek 900ms cubic-bezier(0.16, 0.78, 0.18, 1) both;
}

.pattern-frame::after {
  width: 9px;
  height: 9px;
  left: 18px;
  top: 18px;
  border-radius: 2px;
  background: var(--gold);
  box-shadow:
    18px 0 0 rgba(75, 155, 145, 0.85),
    36px 0 0 rgba(198, 60, 77, 0.8);
  opacity: 0.7;
  animation: stitchWalk 8s steps(28) infinite;
}

.pattern-frame.is-card-switching::after {
  animation:
    stitchWalk 8s steps(28) infinite,
    stitchKick 900ms cubic-bezier(0.16, 0.78, 0.18, 1) both;
}

.pattern-output {
  width: min(100%, 100cqh, 780px);
  max-height: 100%;
  aspect-ratio: 1;
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  isolation: isolate;
  perspective: 1100px;
  filter: drop-shadow(0 24px 34px rgba(0, 0, 0, 0.34));
  animation: patternBreath 7s ease-in-out infinite;
}

.pattern-frame.is-card-switching .pattern-output::before {
  animation: backCardLift 900ms cubic-bezier(0.16, 0.78, 0.18, 1) both;
}

.pattern-frame.is-card-switching .pattern-output::after {
  animation: deepCardLift 900ms cubic-bezier(0.16, 0.78, 0.18, 1) both;
}

.pattern-output::before,
.pattern-output::after {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  border-radius: var(--radius);
  background: #171211;
  pointer-events: none;
}

.pattern-output::before {
  transform: translate(14px, 14px) scale(0.97);
  opacity: 0.58;
}

.pattern-output::after {
  transform: translate(26px, 26px) scale(0.94);
  opacity: 0.32;
}

.pattern-card {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  transform-origin: 50% 52%;
  backface-visibility: hidden;
  will-change: transform, opacity;
}

.pattern-card-current {
  z-index: 2;
}

.pattern-card-in {
  z-index: 2;
  animation: cardRiseFront 900ms cubic-bezier(0.16, 0.78, 0.18, 1) both;
}

.pattern-card-out {
  z-index: 3;
  animation: cardToBack 520ms cubic-bezier(0.16, 0.78, 0.18, 1) both;
}

.pattern-card svg {
  width: 100%;
  height: 100%;
  display: block;
}

.pattern-card-current svg {
  animation: subtleSettle 420ms ease-out both;
}

.culture {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-left: 6px;
  animation: softEnter 640ms ease-out both;
}

.culture-feature {
  color: var(--ink);
  background: transparent;
  padding: 2px 0 2px 14px;
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  box-shadow: none;
}

.culture-feature p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
}

.culture-list {
  display: grid;
  gap: 18px;
}

.culture-card {
  border: 0;
  border-left: 2px solid var(--teal-deep);
  background: transparent;
  padding: 0 0 0 13px;
  border-radius: var(--radius);
}

.culture-card h3 {
  margin: 0 0 6px;
  color: var(--teal);
  font-size: 16px;
  font-weight: 800;
}

.culture-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.culture-more {
  margin: -2px 0 0 15px;
  color: var(--gold);
  font-size: 12px;
  line-height: 1.5;
}

.culture-note {
  display: none;
}

.culture-note h3 {
  color: var(--gold);
  font-size: 13px;
  margin-bottom: 8px;
}

.culture-note p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 22px;
  z-index: 20;
  min-width: 220px;
  max-width: calc(100vw - 32px);
  transform: translate(-50%, 16px);
  opacity: 0;
  pointer-events: none;
  color: var(--ink);
  background: #2f2420;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.34);
  transition:
    opacity 180ms ease,
    transform 180ms ease;
}

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

@keyframes pageRise {
  from {
    opacity: 0.88;
  }
  to {
    opacity: 1;
  }
}

@keyframes softEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes panelReveal {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes selectedPop {
  0% {
    transform: scale(0.98);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes subtleSettle {
  from {
    opacity: 0;
    transform: scale(0.985);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes cardRiseFront {
  from {
    opacity: 0.62;
    transform: translate(58px, 46px) scale(0.88) rotate(2.8deg);
  }
  58% {
    opacity: 1;
    transform: translate(-8px, -8px) scale(1.018) rotate(-0.35deg);
  }
  to {
    opacity: 1;
    transform: translate(0, 0) scale(1) rotate(0);
  }
}

@keyframes cardToBack {
  from {
    opacity: 1;
    transform: translate(0, 0) scale(1) rotate(0);
  }
  42% {
    opacity: 0.42;
    transform: translate(-76px, -42px) scale(0.94) rotate(-4deg);
  }
  72% {
    opacity: 0;
    transform: translate(34px, 30px) scale(0.88) rotate(2deg);
  }
  to {
    opacity: 0;
    transform: translate(58px, 48px) scale(0.84) rotate(3deg);
  }
}

@keyframes backCardLift {
  0% {
    transform: translate(14px, 14px) scale(0.97);
    opacity: 0.58;
  }
  45% {
    transform: translate(5px, 5px) scale(0.992);
    opacity: 0.82;
  }
  100% {
    transform: translate(14px, 14px) scale(0.97);
    opacity: 0.58;
  }
}

@keyframes deepCardLift {
  0% {
    transform: translate(26px, 26px) scale(0.94);
    opacity: 0.32;
  }
  45% {
    transform: translate(15px, 15px) scale(0.965);
    opacity: 0.5;
  }
  100% {
    transform: translate(26px, 26px) scale(0.94);
    opacity: 0.32;
  }
}

@keyframes stackPeek {
  0%,
  100% {
    opacity: 0.35;
  }
  45% {
    opacity: 0.9;
  }
}

@keyframes stitchKick {
  0%,
  100% {
    opacity: 0.7;
  }
  45% {
    opacity: 1;
  }
}

@keyframes patternBreath {
  0%,
  100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(-2px) scale(1.004);
  }
}

@keyframes framePulse {
  0%,
  100% {
    opacity: 0.35;
  }
  50% {
    opacity: 0.75;
  }
}

@keyframes stitchWalk {
  0% {
    transform: translate(0, 0);
  }
  25% {
    transform: translate(calc(100cqw - 92px), 0);
  }
  50% {
    transform: translate(calc(100cqw - 92px), calc(100cqh - 56px));
  }
  75% {
    transform: translate(0, calc(100cqh - 56px));
  }
  100% {
    transform: translate(0, 0);
  }
}

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

@media (max-width: 1180px) {
  .app-shell {
    min-height: 100vh;
    height: auto;
    overflow: visible;
  }

  .studio {
    grid-template-columns: minmax(280px, 340px) minmax(420px, 1fr);
    flex: none;
    overflow: visible;
  }

  .panel {
    height: auto;
    overflow: visible;
  }

  .culture {
    grid-column: 1 / -1;
  }

  .stage {
    min-height: 0;
    height: auto;
  }

  .pattern-frame {
    min-height: 520px;
  }
}

@media (max-width: 820px) {
  .topbar,
  .studio {
    width: min(100% - 20px, 720px);
  }

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

  .top-actions {
    width: 100%;
    justify-content: stretch;
  }

  .top-actions .button {
    flex: 1 1 130px;
  }

  .brand strong {
    white-space: normal;
  }

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

  .controls {
    order: 2;
  }

  .stage {
    order: 1;
    min-height: auto;
  }

  .pattern-output {
    width: 100%;
    max-height: none;
  }

  .culture {
    order: 3;
  }

  .pattern-frame {
    min-height: auto;
    flex: 0 0 auto;
    aspect-ratio: 1;
  }

}

@media (max-width: 520px) {
  .top-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .panel,
  .stage {
    padding: 14px;
  }

  .preset-grid,
  .palette-grid,
  .texture-grid,
  .motif-grid,
  .segmented,
  .toggles {
    grid-template-columns: 1fr;
  }

  .range-row {
    grid-template-columns: 58px 1fr 36px;
  }
}