:root {
  --ink: #241715;
  --paper: #f7f4ef;
  --surface: #ffffff;
  --line: #d9d2c9;
  --muted: #756a64;
  --accent: #c7302b;
  --teal: #0f766e;
  --gold: #c58c31;
  --shadow: 0 18px 44px rgba(36, 23, 21, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    linear-gradient(180deg, rgba(199, 48, 43, 0.08), transparent 320px),
    var(--paper);
  color: var(--ink);
  font-family:
    "Noto Sans TC",
    "PingFang TC",
    "Microsoft JhengHei",
    system-ui,
    sans-serif;
  letter-spacing: 0;
}

button,
input,
select {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

button i,
button svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 22px clamp(18px, 4vw, 48px);
  background: var(--ink);
  color: #fffaf5;
  border-bottom: 4px solid var(--accent);
}

.eyebrow {
  margin: 0 0 3px;
  color: #d9c5ae;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.05;
  font-weight: 900;
}

h2 {
  margin-bottom: 5px;
  font-size: 18px;
  line-height: 1.2;
}

p {
  margin-bottom: 0;
  color: var(--muted);
}

.topbar-actions,
.viewer-head,
.section-head,
.block-title,
.reference-links {
  display: flex;
  align-items: center;
}

.topbar-actions {
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}

.primary-button,
.ghost-button,
.plain-button,
.segmented-button,
.zone-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  gap: 8px;
  border-radius: 8px;
  font-weight: 800;
  white-space: nowrap;
}

.primary-button {
  padding: 0 18px;
  background: #fffaf5;
  color: var(--ink);
}

.ghost-button {
  padding: 0 14px;
  background: rgba(255, 255, 255, 0.12);
  color: #fffaf5;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.plain-button {
  padding: 0 12px;
  background: #f1ede8;
  color: var(--ink);
  border: 1px solid var(--line);
}

.workspace {
  width: min(1500px, calc(100% - 36px));
  margin: 26px auto 56px;
}

.studio-surface {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(320px, 0.7fr);
  gap: 18px;
  align-items: stretch;
}

.viewer-panel,
.control-panel,
.form-strip,
.sheet-section {
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(36, 23, 21, 0.12);
  box-shadow: var(--shadow);
}

.viewer-panel,
.control-panel,
.sheet-section {
  border-radius: 8px;
}

.viewer-panel {
  display: flex;
  min-height: 620px;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
}

.viewer-head,
.section-head {
  justify-content: space-between;
  gap: 18px;
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.viewer-head p,
.section-head p,
.block-title span {
  font-size: 14px;
}

.model-switch {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  background: #f1ede8;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.segmented-button {
  min-width: 92px;
  padding: 0 12px;
  background: transparent;
  color: var(--muted);
}

.segmented-button.is-active {
  background: var(--ink);
  color: #fffaf5;
}

.render-frame {
  position: relative;
  flex: 1;
  min-height: 470px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(36, 23, 21, 0.04) 1px, transparent 1px),
    linear-gradient(rgba(36, 23, 21, 0.04) 1px, transparent 1px),
    #fffdf9;
  background-size: 22px 22px, 22px 22px, auto;
}

#shoeCanvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 470px;
}

#shoeCanvas[hidden],
.three-cache[hidden],
.three-only[hidden] {
  display: none;
}

.render-2d-preview {
  display: grid;
  width: 100%;
  min-height: 470px;
  height: 100%;
  place-items: center;
  padding: clamp(12px, 3vw, 28px);
}

.render-2d-preview svg {
  display: block;
  width: 100%;
  max-width: 1040px;
  height: auto;
  max-height: 100%;
  background: #fffdf9;
  border: 1px solid rgba(36, 23, 21, 0.16);
  border-radius: 8px;
  box-shadow: 0 14px 32px rgba(36, 23, 21, 0.12);
}

.render-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  color: var(--muted);
  font-weight: 800;
}

.render-fallback[hidden] {
  display: none;
}

.control-panel {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
}

.panel-block {
  padding: 18px;
  border-bottom: 1px solid var(--line);
}

.panel-block:last-child {
  border-bottom: 0;
}

.block-title {
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.block-title h2 {
  margin-bottom: 0;
}

.block-title span {
  color: var(--muted);
  text-align: right;
}

.zone-tabs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.zone-button {
  justify-content: flex-start;
  min-height: 64px;
  padding: 8px;
  background: #f7f4ef;
  color: var(--ink);
  border: 1px solid var(--line);
  text-align: left;
  white-space: normal;
}

.zone-button.is-active {
  border-color: var(--ink);
  box-shadow: inset 0 0 0 2px var(--ink);
}

.zone-button.is-hidden {
  display: none;
}

.zone-sample {
  width: 24px;
  height: 24px;
  border: 1px solid rgba(36, 23, 21, 0.28);
  border-radius: 50%;
  background-size: cover;
  background-position: center;
}

.field-label {
  display: block;
  margin: 13px 0 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.field-label:first-child {
  margin-top: 0;
}

.material-display {
  display: grid;
  gap: 7px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf9;
}

.material-display span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.material-display strong {
  font-size: 20px;
  line-height: 1.2;
  font-weight: 900;
}

.text-input,
.form-grid input,
.form-grid select {
  width: 100%;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 0 12px;
  outline: none;
}

.text-input:focus,
.form-grid input:focus,
.form-grid select:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.14);
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(34px, 1fr));
  gap: 9px;
}

.swatch-button {
  width: 100%;
  min-height: 0;
  aspect-ratio: 1;
  border: 1px solid rgba(36, 23, 21, 0.2);
  border-radius: 50%;
  background-size: cover;
  background-position: center;
}

.swatch-button.is-selected {
  border-color: var(--ink);
  box-shadow:
    inset 0 0 0 3px #fffdf9,
    0 0 0 2px var(--ink);
}

.form-strip {
  margin-top: 18px;
  padding: 18px;
  border-radius: 8px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.form-grid label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.wide-field {
  grid-column: span 2;
}

.sheet-section {
  margin-top: 18px;
  overflow: hidden;
}

.reference-links {
  gap: 10px;
}

.reference-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

.sheet-stage {
  padding: clamp(12px, 3vw, 24px);
  background:
    linear-gradient(90deg, rgba(36, 23, 21, 0.06) 1px, transparent 1px),
    linear-gradient(rgba(36, 23, 21, 0.06) 1px, transparent 1px);
  background-size: 22px 22px;
  overflow-x: auto;
}

.sheet-preview {
  width: min(100%, 1180px);
  margin: 0 auto;
  background: #fff;
  box-shadow: 0 12px 32px rgba(36, 23, 21, 0.15);
}

.sheet-preview svg {
  display: block;
  width: 100%;
  height: auto;
}

@media (max-width: 1080px) {
  .studio-surface {
    grid-template-columns: 1fr;
  }

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

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

  .panel-block:last-child {
    border-right: 0;
  }

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

@media (max-width: 760px) {
  .topbar,
  .viewer-head,
  .section-head {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar-actions {
    justify-content: stretch;
  }

  .topbar-actions button,
  .model-switch {
    width: 100%;
  }

  .studio-surface,
  .viewer-panel,
  .control-panel,
  .render-frame,
  .render-2d-preview {
    width: 100%;
    min-width: 0;
  }

  .render-2d-preview svg {
    width: calc(100vw - 56px);
    max-width: calc(100vw - 56px);
  }

  .segmented-button {
    min-width: 0;
  }

  .control-panel {
    display: block;
  }

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

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

  .wide-field {
    grid-column: auto;
  }

  .workspace {
    width: min(100% - 22px, 1500px);
    margin-top: 16px;
  }
}

@media print {
  body {
    background: #fff;
  }

  .topbar,
  .studio-surface,
  .form-strip,
  .section-head {
    display: none;
  }

  .workspace {
    width: 100%;
    margin: 0;
  }

  .sheet-section,
  .sheet-stage,
  .sheet-preview {
    margin: 0;
    padding: 0;
    border: 0;
    box-shadow: none;
  }
}