:root {
  color-scheme: light;
  --app-bg: #f5f6f6;
  --surface: #ffffff;
  --surface-muted: #f8f9f9;
  --border: #dfe3e1;
  --border-strong: #c6ceca;
  --text: #17201e;
  --muted: #68716f;
  --viewer: #101413;
  --primary: #087f62;
  --primary-hover: #066b53;
  --accent: #c27616;
  --surface-hover: #edf8f4;
  --upload-hover: #f0f7f4;
  --ready-bg: #edf8f4;
  --ready-hover: #e3f4ee;
  --ready-border: #8ac6b5;
  --ready-text: #075e49;
  --danger-border: #e59a9a;
  --danger-text: #9f2929;
  --panel-shadow: 0 8px 28px rgba(23, 32, 30, 0.055);
  --button-shadow: 0 4px 12px rgba(8, 127, 98, 0.16);
  --toast-shadow: 0 8px 28px rgba(23, 32, 30, 0.16);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --app-bg: #101513;
  --surface: #1a211f;
  --surface-muted: #141a18;
  --border: #303a36;
  --border-strong: #46534e;
  --text: #edf2f0;
  --muted: #9da9a5;
  --viewer: #080b0a;
  --primary: #2fb88e;
  --primary-hover: #42c79b;
  --accent: #e2a14d;
  --surface-hover: #20332c;
  --upload-hover: #1c2924;
  --ready-bg: #193027;
  --ready-hover: #1e3a30;
  --ready-border: #3e7f69;
  --ready-text: #9ce2cc;
  --danger-border: #8f4a4a;
  --danger-text: #ffb2b2;
  --panel-shadow: 0 8px 28px rgba(0, 0, 0, 0.22);
  --button-shadow: 0 4px 12px rgba(0, 0, 0, 0.24);
  --toast-shadow: 0 8px 28px rgba(0, 0, 0, 0.32);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  min-height: 100%;
  margin: 0;
  background: var(--app-bg);
  color: var(--text);
}

button, input { font: inherit; }

.app-shell {
  width: calc(100% - clamp(28px, 5vw, 64px));
  max-width: 1240px;
  margin: 0 auto;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 2px 18px;
}

.app-header h1 {
  display: flex;
  align-items: baseline;
  flex: 1;
  flex-wrap: wrap;
  gap: 0.35em;
  margin: 0;
  line-height: 1.2;
}

.app-header h1 strong {
  font-size: clamp(1.75rem, 2.5vw, 2.2rem);
  font-weight: 720;
}

.app-header h1 span {
  color: var(--muted);
  font-size: clamp(0.92rem, 1.35vw, 1.08rem);
  font-weight: 550;
}

.header-actions {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: 9px;
}

.project-links {
  display: flex;
  gap: 9px;
}

.header-actions a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 650;
  text-decoration: none;
  transition: border-color 150ms ease-out, background 150ms ease-out;
}

.header-actions a:hover {
  border-color: var(--primary);
  background: var(--surface-hover);
}

.theme-toggle {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 38px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--surface);
  cursor: pointer;
}

.theme-toggle input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.theme-track {
  position: relative;
  width: 28px;
  height: 16px;
  border-radius: 999px;
  background: var(--border-strong);
  transition: background 150ms ease-out;
}

.theme-track::after {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--surface);
  content: "";
  transition: background 150ms ease-out, transform 150ms ease-out;
}

.theme-toggle input:checked + .theme-track { background: var(--primary); }
.theme-toggle input:checked + .theme-track::after { background: #ffffff; transform: translateX(12px); }
.theme-toggle input:focus-visible + .theme-track { outline: 2px solid var(--primary); outline-offset: 3px; }
.theme-toggle:hover { border-color: var(--primary); }

.workspace {
  display: grid;
  grid-template-columns: minmax(300px, 2fr) minmax(360px, 3fr);
  align-items: stretch;
  gap: 18px;
  margin-bottom: 26px;
}

.tool-panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--panel-shadow);
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-width: 0;
  min-height: 56px;
  padding: 17px 12px 15px;
  border-bottom: 1px solid var(--border);
}

.panel-heading h2 {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  gap: 9px;
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
}

.panel-heading h2 span {
  color: var(--accent);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
}

.panel-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.2;
}

.source-panel .panel-heading p {
  flex: 1;
  min-width: 0;
  margin-left: 12px;
  font-size: clamp(0.58rem, 0.72vw, 0.66rem);
  text-align: right;
}

.panel-content { padding: 12px; }

.upload-surface {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 510px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-muted);
  cursor: pointer;
  transition: border-color 150ms ease-out, background 150ms ease-out;
}

.upload-surface:hover,
.upload-surface.dragover {
  border-color: var(--primary);
  background: var(--upload-hover);
}

.upload-surface input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.upload-surface img {
  width: 100%;
  height: 510px;
  object-fit: contain;
  background: var(--surface-muted);
}

.upload-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  color: var(--muted);
  text-align: center;
}

.upload-empty strong { color: var(--text); font-size: 0.9rem; }
.upload-empty small { font-size: 0.75rem; }

.source-actions,
.download-bar {
  display: flex;
  gap: 10px;
  padding: 0 12px 12px;
}

#reconstructButton {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--primary);
  border-radius: 6px;
  background: var(--primary);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--button-shadow);
}

#reconstructButton:hover:not(:disabled) {
  border-color: var(--primary-hover);
  background: var(--primary-hover);
}

#reconstructButton:disabled { cursor: not-allowed; opacity: 0.55; }

.viewer-shell {
  position: relative;
  width: 100%;
  height: 510px;
  overflow: hidden;
  border-radius: 6px;
  background: var(--viewer);
}

.viewer-frame {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  opacity: 0;
  transition: opacity 180ms ease-out;
}

.viewer-preloader {
  position: absolute;
  width: 1px;
  height: 1px;
  border: 0;
  opacity: 0;
  pointer-events: none;
}

.viewer-state {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #f4f7f6;
  text-align: center;
  transition: opacity 180ms ease-out, visibility 180ms ease-out;
}

.viewer-state strong { font-size: 0.9rem; font-weight: 650; }
.viewer-state span { color: #94a19d; font-size: 0.75rem; }

.viewer-indicator {
  width: 32px;
  height: 2px;
  margin-bottom: 7px;
  background: #46514e;
}

.viewer-shell[data-state="loading"] .viewer-indicator,
.viewer-shell[data-state="timeout"] .viewer-indicator {
  width: 34px;
  height: 34px;
  border: 3px solid #35413d;
  border-top-color: #34d399;
  border-radius: 50%;
  background: transparent;
  animation: viewer-spin 0.9s linear infinite;
}

.viewer-shell[data-state="error"] .viewer-indicator {
  width: 32px;
  height: 3px;
  background: #f87171;
}

.viewer-shell[data-state="ready"] .viewer-frame { opacity: 1; }
.viewer-shell[data-state="ready"] .viewer-state { visibility: hidden; opacity: 0; }

@keyframes viewer-spin { to { transform: rotate(360deg); } }

.artifact-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  min-height: 42px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--surface-muted);
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 650;
  text-decoration: none;
  transition: border-color 150ms ease-out, background 150ms ease-out;
}

.artifact-button.ready {
  border-color: var(--ready-border);
  background: var(--ready-bg);
  color: var(--ready-text);
}

.artifact-button.ready:hover {
  border-color: var(--primary);
  background: var(--ready-hover);
}

.artifact-button.disabled { color: var(--muted); pointer-events: none; }

.examples-section {
  margin-bottom: 36px;
  padding: 4px 2px 0;
}

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 11px;
}

.section-heading h2 { margin: 0; font-size: 0.9rem; font-weight: 700; }
.section-heading span { color: var(--muted); font-size: 0.75rem; }

.examples-grid {
  display: grid;
  grid-template-columns: repeat(28, minmax(0, 1fr));
  grid-auto-flow: row dense;
  grid-auto-rows: 158px;
  gap: 10px;
}

.example-item {
  min-width: 0;
  overflow: hidden;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  cursor: pointer;
}

.example-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 150ms ease-out, transform 150ms ease-out;
}

.example-item:hover img { opacity: 0.9; transform: scale(1.015); }
.example-item:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.toast {
  position: fixed;
  bottom: 22px;
  left: 50%;
  z-index: 20;
  max-width: min(90vw, 620px);
  padding: 9px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  font-size: 0.8rem;
  box-shadow: var(--toast-shadow);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 8px);
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}

.toast.visible { opacity: 1; transform: translate(-50%, 0); }
.toast.error { border-color: var(--danger-border); color: var(--danger-text); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; }
  .viewer-indicator { animation-duration: 1.8s !important; }
}

@media (max-width: 980px) {
  .app-shell { width: calc(100% - 28px); }
  .workspace { grid-template-columns: 1fr; }
  .upload-surface { min-height: 420px; }
  .upload-surface img, .viewer-shell { height: 420px; }
  .examples-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .example-item { grid-column: span 2 !important; }
}

@media (max-width: 560px) {
  .app-shell { width: calc(100% - 20px); }
  .app-header { align-items: flex-start; flex-direction: column; gap: 13px; padding: 22px 2px 15px; }
  .app-header h1 strong { font-size: 1.7rem; }
  .app-header h1 span { font-size: 0.9rem; }
  .header-actions { width: 100%; justify-content: space-between; }
  .panel-heading { min-height: 52px; padding: 14px; }
  .source-panel .panel-heading p { margin-left: 8px; }
  .panel-content { padding: 9px; }
  .source-actions, .download-bar { padding: 0 9px 9px; }
  .upload-surface { min-height: 360px; }
  .upload-surface img, .viewer-shell { height: 360px; }
  .examples-section { margin-bottom: 24px; padding: 0; }
  .examples-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); grid-auto-rows: 132px; }
  .example-item { grid-column: span 2 !important; }
  .example-item:last-child:nth-child(odd) { grid-column: span 4 !important; }
}