:root {
  color-scheme: light;
  --bg: #f7f1e8;
  --panel: rgba(255, 251, 246, 0.9);
  --panel-strong: #fffaf3;
  --line: rgba(111, 78, 55, 0.18);
  --text: #2d2118;
  --muted: #6f5b4b;
  --accent: #c96c3c;
  --accent-dark: #9f4f26;
  --shadow: 0 24px 60px rgba(85, 55, 30, 0.14);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 214, 170, 0.6), transparent 36%),
    radial-gradient(circle at bottom right, rgba(235, 188, 153, 0.45), transparent 28%),
    linear-gradient(135deg, #f8f3eb 0%, #efe0cf 100%);
}

.site-header {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 8px;
}

.site-header__inner {
  padding: 8px 4px 0;
}

.site-header h1,
.preview-card h2 {
  margin: 0;
}

.page {
  margin: 0 auto;
}

.panel h2 {
  margin: 0;
}

.page {
  width: min(1120px, calc(100% - 32px));
  padding: 16px 0 48px;
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(320px, 1fr);
  gap: 24px;
}

.panel,
.preview-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.panel {
  padding: 24px;
}

.section-heading {
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-dark);
  font-size: 0.84rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.lead,
.hint {
  color: var(--muted);
  line-height: 1.6;
}

.controls {
  display: grid;
  gap: 18px;
}

.control-group {
  display: grid;
  gap: 18px;
}

.field {
  display: grid;
  gap: 10px;
}

.field-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.field span {
  font-size: 0.95rem;
  font-weight: 700;
}

.field input[type="number"],
.field input[type="file"],
.field select {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--panel-strong);
  color: var(--text);
  font: inherit;
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.field input:disabled,
.field select:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.field-file input {
  cursor: pointer;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: fit-content;
  font-weight: 700;
  color: var(--text);
  cursor: pointer;
  flex-wrap: wrap;
}

.toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

.inline-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.output-size-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  color: var(--muted);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.actions-single button {
  width: 100%;
  justify-content: center;
}

.download-note {
  margin: -8px 0 0;
  min-height: 1.6em;
  color: #b0442e;
  font-size: 0.92rem;
  text-align: center;
}

.download-note.is-hidden {
  visibility: hidden;
}

button {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 14px 22px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 140ms ease,
    opacity 140ms ease,
    background 140ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

#generate-button {
  background: var(--accent);
  color: #fff;
}

#generate-button:hover:not(:disabled) {
  background: var(--accent-dark);
}

#download-button {
  background: #ead9c9;
  color: var(--text);
}

#output-size-value {
  text-align: right;
  white-space: nowrap;
}

.preview-panel {
  min-width: 0;
}

.preview-card {
  padding: 24px;
  height: 100%;
  display: grid;
  gap: 16px;
}

#preview-canvas {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 24px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.5), rgba(233, 216, 196, 0.8));
  border: 1px solid rgba(111, 78, 55, 0.14);
}

@media (max-width: 900px) {
  .site-header {
    padding: 24px 0 4px;
  }

  .page {
    grid-template-columns: 1fr;
    padding-top: 12px;
  }

  .panel,
  .preview-card {
    padding: 22px;
  }

  .inline-actions {
    align-items: stretch;
  }

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