:root {
  --main: #008080;
  --main-dark: #0f5f5f;
  --main-soft: #e5f5f5;
  --bg: #f4f7f7;
  --card: rgba(255, 255, 255, 0.97);
  --text: #23313a;
  --muted: #63737c;
  --border: #d9e3e3;
  --danger: #c44d4d;
  --danger-soft: #fff1f1;
  --living: #f3e7d8;
  --wet: #dff0fb;
  --shadow: 0 16px 30px rgba(22, 49, 54, 0.08);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  color: var(--text);
  line-height: 1.6;
  background:
    radial-gradient(circle at top left, rgba(0, 128, 128, 0.08), transparent 28%),
    linear-gradient(180deg, #fbfcfc 0%, #edf4f4 100%);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.page {
  width: min(1440px, calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0 40px;
}

.back-link {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--main);
  font-weight: 700;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
  text-decoration: underline;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero,
.tool-panel,
.canvas-card {
  padding: 24px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--main-soft);
  color: var(--main-dark);
  font-size: 0.82rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
}

h1 {
  margin-top: 14px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.3;
}

h2 {
  font-size: 1.15rem;
}

h3 {
  font-size: 1rem;
}

.hero-text,
.section-head p,
.section-head-inline p,
.inline-note {
  margin: 0;
  color: var(--muted);
}

.hero-notes {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.mini-note {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #f8fbfb;
}

.mini-note.strong {
  background: #eef8f8;
  border-color: #c0dddd;
  color: var(--main-dark);
  font-weight: 700;
}

.workspace {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 18px;
  margin-top: 18px;
}

.tool-panel {
  align-self: start;
  position: sticky;
  top: 16px;
}

.panel-section + .panel-section {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.section-head,
.section-head-inline {
  display: grid;
  gap: 6px;
}

.section-head-inline {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 12px;
}

.file-picker {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.file-picker span,
.field span {
  font-weight: 700;
  font-size: 0.94rem;
}

.file-picker input[type="file"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
  font-weight: 700;
}

.field {
  display: grid;
  gap: 8px;
}

.field input[type="text"],
.field input[type="number"] {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid #c8d4d4;
  border-radius: 12px;
  background: #fff;
  color: var(--text);
}

.field input[type="range"] {
  width: 100%;
}

.field input:focus {
  outline: 3px solid rgba(0, 128, 128, 0.15);
  border-color: var(--main);
}

.warning {
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid #e7cf98;
  border-radius: 14px;
  background: #fff8e9;
  color: #7c6018;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.tool-button,
.primary-button,
.secondary-button,
.danger-button {
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 12px 14px;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.tool-button {
  background: #f5f9f9;
  border-color: #d5e2e2;
  color: var(--main-dark);
}

.tool-button.is-active {
  background: var(--main-soft);
  border-color: #b8d9d9;
  box-shadow: inset 0 0 0 1px rgba(0, 128, 128, 0.1);
}

.primary-button {
  width: 100%;
  background: linear-gradient(135deg, var(--main), #0a7070);
  color: #fff;
}

.secondary-button {
  background: #f3f8f8;
  border-color: #d2dfdf;
  color: var(--main-dark);
}

.danger-button {
  background: var(--danger-soft);
  border-color: #efcaca;
  color: var(--danger);
}

.tool-button:hover,
.primary-button:hover,
.secondary-button:hover,
.danger-button:hover,
.tool-button:focus-visible,
.primary-button:focus-visible,
.secondary-button:focus-visible,
.danger-button:focus-visible {
  transform: translateY(-1px);
}

.selected-chip,
.canvas-size-label {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: #f1f6f6;
  color: var(--main-dark);
  font-size: 0.82rem;
  font-weight: 700;
}

.property-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.field-full {
  grid-column: 1 / -1;
}

.button-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.canvas-layout {
  display: grid;
  gap: 18px;
}

.source-stage,
.editor-stage {
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background:
    linear-gradient(45deg, #f7f9f9 25%, transparent 25%, transparent 75%, #f7f9f9 75%, #f7f9f9),
    linear-gradient(45deg, #f7f9f9 25%, #ffffff 25%, #ffffff 75%, #f7f9f9 75%, #f7f9f9);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
}

.source-stage {
  min-height: 320px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.source-placeholder {
  width: min(90%, 420px);
  padding: 18px;
  border: 1px dashed #c6d4d4;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.85);
  color: var(--muted);
  text-align: center;
}

.source-preview {
  display: none;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.canvas-scroll {
  margin-top: 16px;
  overflow: auto;
}

.editor-stage {
  min-width: 1000px;
  min-height: 700px;
  overflow: hidden;
}

.editor-canvas {
  display: block;
  background: #fff;
}

.is-hidden {
  display: none;
}

@media (max-width: 1180px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .tool-panel {
    position: static;
  }
}

@media (max-width: 720px) {
  .page {
    width: min(100% - 16px, 1440px);
    padding: 14px 0 28px;
  }

  .hero,
  .tool-panel,
  .canvas-card {
    padding: 18px;
  }

  .section-head-inline {
    grid-template-columns: 1fr;
  }

  .tool-grid,
  .property-grid,
  .button-row {
    grid-template-columns: 1fr;
  }
}