:root {
  color-scheme: light dark;
  --bg: #f4f1f8;
  --surface: #ffffff;
  --surface-2: #f8f6fb;
  --text: #261b2d;
  --muted: #74697c;
  --border: #ded6e5;
  --accent: #6f2b9f;
  --accent-2: #8d4ab8;
  --accent-soft: #efe3f8;
  --success: #18794e;
  --warning: #9a5b13;
  --danger: #b42318;
  --shadow: 0 18px 42px rgba(47, 25, 61, 0.09);
  --radius: 22px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151119;
    --surface: #211a26;
    --surface-2: #2a2130;
    --text: #f4edf7;
    --muted: #b9adbf;
    --border: #46394e;
    --accent: #b875dd;
    --accent-2: #cf9bea;
    --accent-soft: #392642;
    --success: #58c78f;
    --warning: #efb264;
    --danger: #ff8a80;
    --shadow: 0 18px 42px rgba(0, 0, 0, 0.22);
  }
}

* { box-sizing: border-box; }

html { min-width: 320px; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.46; }

h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 2px; font-size: clamp(1.1rem, 2vw, 1.35rem); }
h2 { margin-bottom: 8px; font-size: clamp(1.35rem, 2.5vw, 1.8rem); }
h3 { margin-bottom: 6px; font-size: 1.02rem; }
p { color: var(--muted); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px clamp(16px, 4vw, 48px);
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(18px);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 42px; height: 42px; }
.brand p { margin: 0; font-size: 0.82rem; }

.app-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 24px;
  width: min(1500px, 100%);
  margin: 0 auto;
  padding: 28px clamp(16px, 4vw, 48px) 48px;
}

.stepper {
  position: sticky;
  top: 96px;
  align-self: start;
  display: grid;
  gap: 10px;
}

.step {
  display: grid;
  grid-template-columns: 34px 1fr;
  grid-template-rows: auto auto;
  gap: 1px 10px;
  width: 100%;
  padding: 13px;
  text-align: left;
  color: var(--text);
  border: 1px solid transparent;
  border-radius: 15px;
  background: transparent;
}

.step > span {
  grid-row: 1 / 3;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-weight: 700;
}

.step strong { align-self: end; }
.step small { color: var(--muted); }
.step.active { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 34%, var(--border)); }
.step.active > span { color: white; background: var(--accent); border-color: var(--accent); }
.step.done > span { color: white; background: var(--success); border-color: var(--success); }

.workspace { min-width: 0; }

.panel {
  padding: clamp(18px, 3vw, 34px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 24px;
}
.panel-heading p:last-child { max-width: 760px; margin-bottom: 0; }

.eyebrow {
  margin-bottom: 5px;
  color: var(--accent);
  font-weight: 800;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.status-pill, .direction-label {
  display: inline-flex;
  align-items: center;
  width: max-content;
  border-radius: 999px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}
.status-pill { padding: 7px 10px; }
.direction-label { padding: 3px 7px; margin-bottom: 6px; color: var(--accent); }
.status-pill.online { color: var(--success); border-color: color-mix(in srgb, var(--success) 35%, var(--border)); }
.status-pill.offline { color: var(--warning); border-color: color-mix(in srgb, var(--warning) 35%, var(--border)); }

.input-tabs { display: flex; gap: 8px; margin-bottom: 14px; }
.tab {
  padding: 9px 15px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: var(--surface-2);
}
.tab.active { color: white; border-color: var(--accent); background: var(--accent); }

.drop-zone {
  display: grid;
  place-items: center;
  min-height: 260px;
  padding: 30px;
  border: 2px dashed color-mix(in srgb, var(--accent) 45%, var(--border));
  border-radius: 19px;
  text-align: center;
  background: var(--surface-2);
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.drop-zone:hover, .drop-zone.dragover { transform: translateY(-1px); border-color: var(--accent); background: var(--accent-soft); }
.drop-zone input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop-zone strong { margin-top: 10px; }
.drop-zone small { color: var(--muted); }
.drop-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 16px;
  color: white;
  background: var(--accent);
  font-size: 1.4rem;
  font-weight: 800;
}

.reference-preview {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 360px;
  padding: 18px;
  border-radius: 19px;
  overflow: hidden;
  background-color: var(--surface-2);
  background-image: linear-gradient(45deg, color-mix(in srgb, var(--border) 55%, transparent) 25%, transparent 25%), linear-gradient(-45deg, color-mix(in srgb, var(--border) 55%, transparent) 25%, transparent 25%), linear-gradient(45deg, transparent 75%, color-mix(in srgb, var(--border) 55%, transparent) 75%), linear-gradient(-45deg, transparent 75%, color-mix(in srgb, var(--border) 55%, transparent) 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
}
.reference-preview img { max-width: 100%; max-height: 520px; object-fit: contain; }
.reference-preview .small-button { position: absolute; right: 16px; bottom: 16px; }

.model-stage { display: grid; gap: 14px; }
model-viewer {
  width: 100%;
  height: min(62vh, 620px);
  min-height: 360px;
  border: 1px solid var(--border);
  border-radius: 19px;
  background: var(--surface-2);
}
.capture-row { display: flex; flex-wrap: wrap; gap: 10px; }
.capture-previews { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.capture-previews figure { margin: 0; }
.capture-previews figcaption { margin-bottom: 6px; color: var(--muted); font-size: 0.82rem; }
.capture-previews img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: contain;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-2);
}
.capture-previews img:not([src]) { display: none; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.form-grid.compact { grid-template-columns: repeat(3, minmax(0, 1fr)); }

label { display: grid; gap: 7px; color: var(--text); font-weight: 650; font-size: 0.9rem; }
input[type="text"], input[type="url"], input[type="password"], input[type="number"], textarea, select {
  width: 100%;
  min-width: 0;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  background: var(--surface-2);
  outline: none;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
textarea { resize: vertical; }
.description-field { position: relative; margin-top: 18px; }
.description-field > span { justify-self: end; color: var(--muted); font-size: 0.76rem; font-weight: 500; }

input[type="range"] { width: 100%; accent-color: var(--accent); }
.range-value { color: var(--muted); font-size: 0.8rem; font-weight: 600; }
.check-label { align-content: center; grid-template-columns: auto 1fr; align-items: center; }
.check-label input { width: 18px; height: 18px; accent-color: var(--accent); }

.advanced-options {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-2);
}
.advanced-options summary { cursor: pointer; font-weight: 750; }

.action-row {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
}
.inline-message { margin: 0 auto 0 0; font-size: 0.88rem; }
.inline-message.error { color: var(--danger); }
.inline-message.success { color: var(--success); }

.primary-button, .secondary-button, .ghost-button, .small-button, .icon-button, .export-button {
  border: 1px solid var(--border);
  border-radius: 12px;
  font-weight: 750;
}
.primary-button { padding: 11px 17px; color: white; background: var(--accent); border-color: var(--accent); }
.primary-button:hover { background: var(--accent-2); }
.secondary-button { padding: 10px 15px; color: var(--accent); background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 28%, var(--border)); }
.ghost-button { padding: 9px 13px; color: var(--text); background: transparent; }
.small-button { padding: 8px 11px; color: var(--text); background: var(--surface); }
.icon-button {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  color: var(--text);
  background: var(--surface-2);
  font-size: 1.1rem;
}

.generation-progress {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding: 15px;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
  border-radius: 14px;
  background: var(--accent-soft);
}
.generation-progress p { margin-bottom: 0; }
.spinner {
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: 4px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.result-card { min-width: 0; border: 1px solid var(--border); border-radius: 17px; overflow: hidden; background: var(--surface-2); }
.result-card header { display: flex; justify-content: space-between; gap: 10px; align-items: center; padding: 14px; }
.result-card h3 { margin-bottom: 0; }
.image-stage { display: grid; place-items: center; aspect-ratio: 3 / 4; overflow: hidden; }
.image-stage img, .image-stage canvas { display: block; width: 100%; height: 100%; object-fit: contain; }
.checkerboard {
  background-color: #f7f7f7;
  background-image: linear-gradient(45deg, #e7e7e7 25%, transparent 25%), linear-gradient(-45deg, #e7e7e7 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #e7e7e7 75%), linear-gradient(-45deg, transparent 75%, #e7e7e7 75%);
  background-size: 22px 22px;
  background-position: 0 0, 0 11px, 11px -11px, -11px 0;
}

.sprite-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 18px;
}
.sprite-toolbar label { min-width: min(100%, 330px); }
.refinement-layout { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 18px; align-items: start; }
.refinement-panel {
  display: grid;
  gap: 15px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-2);
}
.refinement-panel h3 { margin-bottom: 0; }
.sprite-stage { image-rendering: auto; }

.export-summary {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface-2);
}
.export-summary h3, .export-summary p { margin-bottom: 0; }
.pack-icon { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 18px; background: var(--accent-soft); }
.pack-icon img { width: 44px; height: 44px; }
.export-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.export-button { display: grid; gap: 4px; padding: 18px; text-align: left; color: var(--text); background: var(--surface-2); }
.export-button span { color: var(--muted); font-size: 0.84rem; font-weight: 500; }
.export-button.featured { color: white; background: var(--accent); border-color: var(--accent); }
.export-button.featured span { color: rgba(255,255,255,0.78); }
.package-details { margin-top: 20px; padding: 18px; border: 1px solid var(--border); border-radius: 16px; background: var(--surface-2); }

.settings-dialog {
  width: min(560px, calc(100vw - 28px));
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 18px;
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--shadow);
}
dialog { border: 0; padding: 0; background: transparent; }
dialog::backdrop { background: rgba(16, 10, 20, 0.6); backdrop-filter: blur(4px); }
.settings-dialog header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 18px; }
.settings-dialog footer { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }
.settings-dialog label + label { margin-top: 14px; }
.helper-text { margin: 0; color: var(--muted); font-size: 0.82rem; }
code { padding: 2px 5px; border-radius: 6px; background: var(--surface-2); }

.hidden { display: none !important; }

@media (max-width: 980px) {
  .app-shell { grid-template-columns: 1fr; }
  .stepper { position: static; grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .step { grid-template-columns: 28px 1fr; padding: 9px; }
  .step > span { width: 28px; height: 28px; }
  .step small { display: none; }
  .refinement-layout { grid-template-columns: 1fr; }
  .refinement-panel { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .refinement-panel h3, .refinement-panel .small-button { grid-column: 1 / -1; }
}

@media (max-width: 700px) {
  .topbar { align-items: flex-start; }
  .brand p { display: none; }
  .app-shell { padding-top: 16px; }
  .stepper { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panel-heading { display: grid; }
  .panel-heading .ghost-button, .panel-heading .status-pill { justify-self: start; }
  .form-grid, .form-grid.compact, .result-grid, .export-grid, .capture-previews { grid-template-columns: 1fr; }
  .sprite-toolbar { align-items: stretch; flex-direction: column; }
  .action-row { align-items: stretch; flex-direction: column; }
  .inline-message { margin: 0; }
  .action-row button { width: 100%; }
  .refinement-panel { grid-template-columns: 1fr; }
  .refinement-panel h3, .refinement-panel .small-button { grid-column: auto; }
  .capture-row { display: grid; }
}