:root {
  --ink: #111210;
  --ink-soft: #191b18;
  --ink-raised: #232520;
  --paper: #f0eee8;
  --paper-dim: #a7aaa0;
  --line: #393c35;
  --signal: #e64b32;
  --signal-dark: #b63120;
  --mint: #77c7a3;
  --warning: #ffb86b;
  --display: Bahnschrift, "Arial Narrow", sans-serif;
  --body: "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --mono: "Cascadia Mono", Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--body);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background:
    linear-gradient(rgba(240, 238, 232, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(240, 238, 232, 0.025) 1px, transparent 1px),
    var(--ink);
  background-size: 48px 48px;
}

button,
input,
textarea {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible,
textarea:focus-visible,
input:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.app-shell {
  width: min(100%, 1680px);
  min-height: 100vh;
  margin: 0 auto;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: rgba(17, 18, 16, 0.96);
}

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 clamp(20px, 3vw, 48px);
  border-bottom: 1px solid var(--line);
  background: rgba(17, 18, 16, 0.9);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--paper);
  font-family: var(--display);
  font-size: 22px;
  font-weight: 650;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border: 1px solid var(--paper);
  border-radius: 50%;
}

.brand-mark i {
  position: absolute;
  width: 12px;
  height: 1px;
  background: var(--signal);
  transform-origin: center;
}

.brand-mark i:nth-child(2) {
  transform: rotate(60deg);
}

.brand-mark i:nth-child(3) {
  transform: rotate(-60deg);
}

.topbar-actions,
.api-state,
.icon-text-button {
  display: flex;
  align-items: center;
}

.topbar-actions {
  gap: 18px;
}

.api-state {
  gap: 8px;
  color: var(--paper-dim);
  font-family: var(--mono);
  font-size: 12px;
}

.api-state i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--warning);
  box-shadow: 0 0 0 4px rgba(255, 184, 107, 0.1);
}

.api-state.is-ready i {
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(119, 199, 163, 0.1);
}

.icon-text-button,
.quiet-button,
.close-button,
.secondary-button,
.primary-button,
.download-button {
  border: 0;
  background: transparent;
  cursor: pointer;
}

.icon-text-button {
  gap: 8px;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 13px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(390px, 0.72fr) minmax(520px, 1.28fr);
  min-height: calc(100vh - 72px);
}

.control-panel {
  padding: clamp(32px, 4vw, 68px) clamp(24px, 4vw, 64px);
  border-right: 1px solid var(--line);
}

.panel-heading,
.history-heading,
.dialog-heading,
.canvas-toolbar,
.control-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
}

h1,
h2,
p {
  letter-spacing: 0;
}

h1,
h2 {
  margin: 0;
  font-family: var(--display);
  font-weight: 500;
}

h1 {
  max-width: 500px;
  font-size: clamp(32px, 3.1vw, 54px);
  line-height: 1.08;
}

h2 {
  font-size: 26px;
}

.counter {
  flex: 0 0 auto;
  margin-top: 28px;
  color: var(--paper-dim);
  font-family: var(--mono);
  font-size: 11px;
}

#generateForm {
  margin-top: 38px;
}

.prompt-frame {
  border: 1px solid var(--line);
  background: var(--ink-soft);
  transition: border-color 180ms ease;
}

.prompt-frame:focus-within {
  border-color: var(--paper-dim);
}

textarea {
  display: block;
  width: 100%;
  min-height: 220px;
  resize: vertical;
  padding: 24px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--paper);
  font-size: 15px;
  line-height: 1.8;
}

textarea::placeholder {
  color: #6f7369;
}

.prompt-tools {
  display: flex;
  justify-content: flex-end;
  gap: 16px;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
}

.quiet-button {
  padding: 3px 0;
  color: var(--paper-dim);
  font-size: 12px;
}

.quiet-button:hover {
  color: var(--paper);
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.control-group {
  margin-top: 28px;
}

legend,
.model-readout > span,
.field-label {
  margin-bottom: 12px;
  color: var(--paper-dim);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
}

.size-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.reference-upload {
  border: 1px dashed var(--line);
  background: var(--ink-soft);
  transition: border-color 160ms ease, background 160ms ease;
}

.reference-upload.is-dragging {
  border-color: var(--mint);
  background: rgba(119, 199, 163, 0.06);
}

.upload-trigger {
  display: flex;
  min-height: 76px;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
}

.reference-upload.has-file .upload-trigger {
  display: none;
}

.upload-icon {
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  place-items: center;
  border: 1px solid var(--line);
  color: var(--signal);
  font-size: 20px;
}

.upload-trigger strong,
.upload-trigger small,
.reference-copy strong,
.reference-copy small {
  display: block;
}

.upload-trigger strong,
.reference-copy strong {
  overflow: hidden;
  color: var(--paper);
  font-size: 13px;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.upload-trigger small,
.reference-copy small {
  margin-top: 5px;
  color: var(--paper-dim);
  font-family: var(--mono);
  font-size: 9px;
}

.reference-preview {
  display: grid;
  min-height: 84px;
  grid-template-columns: 64px minmax(0, 1fr) 36px;
  align-items: center;
  gap: 14px;
  padding: 10px;
}

.reference-preview img {
  width: 64px;
  height: 64px;
  object-fit: cover;
  background: var(--ink-raised);
}

.reference-copy {
  min-width: 0;
}

.remove-reference {
  display: grid;
  width: 32px;
  height: 32px;
  padding: 0;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--paper-dim);
  cursor: pointer;
  font-size: 22px;
}

.size-option {
  position: relative;
  display: flex;
  align-items: center;
  min-width: 0;
  min-height: 70px;
  gap: 12px;
  padding: 12px;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease;
}

.size-option:hover {
  background: var(--ink-soft);
}

.size-option:has(input:checked) {
  border-color: var(--paper);
  background: var(--ink-raised);
}

.size-option input,
.segment-control input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.ratio-icon {
  flex: 0 0 auto;
  display: block;
  border: 1px solid var(--paper-dim);
}

.ratio-icon.square {
  width: 22px;
  height: 22px;
}

.ratio-icon.landscape {
  width: 26px;
  height: 18px;
}

.ratio-icon.portrait {
  width: 17px;
  height: 25px;
}

.size-option strong,
.size-option small {
  display: block;
  white-space: nowrap;
}

.custom-size-option {
  display: grid;
  min-height: 48px;
  grid-template-columns: auto minmax(74px, 1fr) auto minmax(74px, 1fr) auto;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  color: var(--paper-dim);
  font-size: 12px;
  cursor: pointer;
}

.custom-size-option:has(input[type="radio"]:checked) {
  border-color: var(--paper);
  background: var(--ink-raised);
  color: var(--paper);
}

.custom-size-option input[type="radio"] {
  width: 15px;
  height: 15px;
  margin: 0;
  accent-color: var(--signal);
}

.custom-size-option input[type="number"] {
  width: 100%;
  min-width: 0;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--line);
  outline: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
}

.custom-size-option input[type="number"]:focus {
  border-color: var(--paper-dim);
}

.custom-size-option small {
  font-family: var(--mono);
  font-size: 9px;
}

.size-option strong {
  font-size: 13px;
  font-weight: 500;
}

.size-option small {
  margin-top: 4px;
  color: var(--paper-dim);
  font-family: var(--mono);
  font-size: 9px;
}

.control-row {
  align-items: flex-end;
  margin-top: 28px;
}

.quality-group {
  flex: 1;
  margin-top: 0;
}

.segment-control {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  padding: 3px;
  background: var(--ink-raised);
}

.segment-control label {
  position: relative;
  cursor: pointer;
}

.segment-control span {
  display: grid;
  min-height: 36px;
  place-items: center;
  color: var(--paper-dim);
  font-size: 12px;
}

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

.model-readout {
  min-width: 118px;
  padding-bottom: 6px;
  text-align: right;
}

.model-readout span,
.model-readout strong {
  display: block;
}

.model-readout strong {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
}

.generate-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 62px;
  margin-top: 32px;
  padding: 0 22px;
  border: 0;
  background: var(--signal);
  color: white;
  cursor: pointer;
  font-family: var(--display);
  font-size: 18px;
  font-weight: 600;
  transition: background 160ms ease, transform 160ms ease;
}

.generate-button:hover {
  background: #f05c43;
}

.generate-button:active {
  transform: translateY(1px);
}

.generate-button:disabled {
  background: #71352d;
  cursor: wait;
}

.button-arrow {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  font-size: 20px;
}

.canvas-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) 3px auto;
  min-width: 0;
  padding: clamp(24px, 3vw, 48px);
  background: #151713;
}

.canvas-toolbar {
  align-items: center;
  min-height: 38px;
  margin-bottom: 18px;
}

.result-label span,
.result-label strong {
  display: block;
}

.result-label span {
  margin-bottom: 4px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 10px;
}

.result-label strong {
  color: var(--paper-dim);
  font-size: 12px;
  font-weight: 400;
}

.download-button {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  gap: 8px;
  padding: 0 13px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 12px;
  text-decoration: none;
}

.canvas {
  position: relative;
  display: grid;
  min-height: 540px;
  overflow: hidden;
  place-items: center;
  border: 1px solid var(--line);
  background:
    linear-gradient(45deg, #191b18 25%, transparent 25%),
    linear-gradient(-45deg, #191b18 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #191b18 75%),
    linear-gradient(-45deg, transparent 75%, #191b18 75%),
    #171916;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
  background-size: 18px 18px;
}

.empty-state {
  display: grid;
  max-width: 300px;
  justify-items: center;
  gap: 24px;
  color: var(--paper-dim);
  text-align: center;
}

.empty-state p {
  margin: 0;
  font-size: 13px;
}

.aperture {
  position: relative;
  width: 74px;
  height: 74px;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.aperture::after {
  position: absolute;
  inset: 22px;
  border: 1px solid var(--signal);
  border-radius: 50%;
  content: "";
}

.aperture span {
  position: absolute;
  top: 36px;
  left: 36px;
  width: 28px;
  height: 1px;
  background: var(--line);
  transform-origin: 0 0;
}

.aperture span:nth-child(2) { transform: rotate(60deg); }
.aperture span:nth-child(3) { transform: rotate(120deg); }
.aperture span:nth-child(4) { transform: rotate(180deg); }
.aperture span:nth-child(5) { transform: rotate(240deg); }
.aperture span:nth-child(6) { transform: rotate(300deg); }

.developing-state {
  display: grid;
  width: min(72%, 520px);
  justify-items: center;
  gap: 26px;
}

.developing-plate {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: #20231e;
}

.developing-plate::before {
  position: absolute;
  z-index: 1;
  inset: -30%;
  background: linear-gradient(115deg, transparent 38%, rgba(230, 75, 50, 0.18) 48%, rgba(240, 238, 232, 0.08) 54%, transparent 64%);
  content: "";
  animation: scan 2.4s ease-in-out infinite;
}

.grain {
  position: absolute;
  inset: 0;
  opacity: 0.4;
  background-image: radial-gradient(rgba(240, 238, 232, 0.28) 0.7px, transparent 0.8px);
  background-size: 5px 5px;
  animation: grain 500ms steps(2) infinite;
}

.developing-copy {
  display: grid;
  justify-items: center;
  gap: 6px;
}

.developing-copy strong {
  font-family: var(--display);
  font-size: 18px;
  font-weight: 500;
}

.developing-copy span {
  color: var(--paper-dim);
  font-size: 12px;
}

.result-figure {
  display: grid;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: clamp(12px, 2vw, 28px);
  place-items: center;
}

.result-figure img {
  display: block;
  max-width: 100%;
  max-height: min(72vh, 900px);
  object-fit: contain;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.develop-track {
  position: relative;
  overflow: hidden;
  margin-top: 16px;
  background: var(--line);
}

.develop-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--signal);
}

.develop-track.is-running span {
  animation: develop-progress 28s cubic-bezier(0.1, 0.65, 0.2, 1) forwards;
}

.develop-track.is-done span {
  width: 100%;
  transition: width 300ms ease;
}

.error-banner {
  margin-top: 14px;
  padding: 13px 15px;
  border-left: 3px solid var(--warning);
  background: rgba(255, 184, 107, 0.08);
  color: #ffd5a6;
  font-size: 12px;
  line-height: 1.6;
}

.history-section {
  padding: 42px clamp(24px, 4vw, 64px) 64px;
  border-top: 1px solid var(--line);
}

.history-heading {
  align-items: flex-end;
  margin-bottom: 22px;
}

.history-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.history-empty {
  grid-column: 1 / -1;
  margin: 0;
  padding: 30px 0;
  border-top: 1px solid var(--line);
  color: var(--paper-dim);
  font-size: 13px;
}

.history-item {
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-soft);
  cursor: pointer;
}

.history-item button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  text-align: left;
}

.history-thumb {
  display: grid;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  place-items: center;
  background: #20221e;
}

.history-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 240ms ease;
}

.history-item:hover img {
  transform: scale(1.025);
}

.history-copy {
  padding: 12px;
}

.history-copy p {
  display: -webkit-box;
  min-height: 38px;
  overflow: hidden;
  margin: 0;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  color: var(--paper);
  font-size: 11px;
  line-height: 1.65;
}

.history-copy span {
  display: block;
  margin-top: 9px;
  color: var(--paper-dim);
  font-family: var(--mono);
  font-size: 9px;
}

.settings-dialog {
  width: min(calc(100% - 32px), 520px);
  padding: 0;
  border: 1px solid #50544b;
  border-radius: 0;
  background: var(--ink-soft);
  color: var(--paper);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.65);
}

.settings-dialog::backdrop {
  background: rgba(5, 6, 5, 0.72);
  backdrop-filter: blur(5px);
}

.dialog-inner {
  padding: 30px;
}

.dialog-heading {
  align-items: flex-start;
}

.close-button {
  width: 36px;
  height: 36px;
  color: var(--paper-dim);
  font-size: 28px;
  line-height: 1;
}

.dialog-copy {
  margin: 26px 0;
  color: var(--paper-dim);
  font-size: 13px;
  line-height: 1.7;
}

.field-label {
  display: block;
}

.key-field {
  display: flex;
  border: 1px solid var(--line);
  background: var(--ink);
}

.key-field:focus-within {
  border-color: var(--paper-dim);
}

.key-field input {
  flex: 1;
  min-width: 0;
  height: 48px;
  padding: 0 14px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--mono);
}

.key-field button {
  width: 60px;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--paper-dim);
  cursor: pointer;
  font-size: 12px;
}

.remember-option {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 14px;
  color: var(--paper-dim);
  cursor: pointer;
  font-size: 12px;
}

.remember-option input {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--signal);
}

.dialog-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 30px;
}

.secondary-button,
.primary-button {
  min-height: 44px;
  padding: 0 16px;
  font-size: 12px;
}

.secondary-button {
  color: var(--paper-dim);
}

.primary-button {
  background: var(--signal);
  color: white;
}

.is-hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

@keyframes scan {
  0% { transform: translateX(-45%) rotate(3deg); }
  50% { transform: translateX(45%) rotate(3deg); }
  100% { transform: translateX(-45%) rotate(3deg); }
}

@keyframes grain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(2px, -1px); }
  50% { transform: translate(-1px, 2px); }
  75% { transform: translate(1px, 1px); }
}

@keyframes develop-progress {
  0% { width: 0; }
  30% { width: 36%; }
  65% { width: 67%; }
  100% { width: 92%; }
}

@media (max-width: 1100px) {
  .workspace {
    grid-template-columns: minmax(340px, 0.85fr) minmax(420px, 1.15fr);
  }

  .control-panel,
  .canvas-panel {
    padding: 32px;
  }

  .size-option {
    align-items: flex-start;
    flex-direction: column;
    gap: 9px;
  }

  .size-options {
    grid-template-columns: repeat(2, 1fr);
  }

  .history-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .app-shell {
    border: 0;
  }

  .workspace {
    display: block;
  }

  .control-panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .canvas {
    min-height: min(76vw, 680px);
  }

  .history-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .topbar {
    height: 62px;
    padding: 0 16px;
  }

  .brand {
    font-size: 19px;
  }

  .brand-mark {
    width: 25px;
    height: 25px;
  }

  .api-state {
    display: none;
  }

  .icon-text-button {
    padding: 0 9px;
  }

  .workspace {
    min-height: calc(100vh - 62px);
  }

  .control-panel,
  .canvas-panel,
  .history-section {
    padding: 28px 18px;
  }

  .panel-heading {
    display: block;
  }

  h1 {
    font-size: 36px;
  }

  .counter {
    display: block;
    margin-top: 12px;
    text-align: right;
  }

  #generateForm {
    margin-top: 20px;
  }

  textarea {
    min-height: 190px;
    padding: 18px;
  }

  .size-option {
    min-height: 64px;
    padding: 10px;
  }

  .size-option small {
    display: none;
  }

  .custom-size-option {
    grid-template-columns: auto minmax(58px, 1fr) auto minmax(58px, 1fr) auto;
    gap: 7px;
    padding-inline: 9px;
  }

  .control-row {
    display: block;
  }

  .model-readout {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 18px;
    padding: 0;
    text-align: left;
  }

  .model-readout > span {
    margin: 0;
  }

  .canvas {
    min-height: calc(100vw - 36px);
  }

  .developing-state {
    width: 76%;
  }

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

  .dialog-inner {
    padding: 22px;
  }

  .dialog-actions {
    align-items: stretch;
    flex-direction: column-reverse;
  }
}

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