:root {
  --ui-bg: #f8fafc;
  --ui-panel: #ffffff;
  --ui-border: #e2e8f0;
  --ui-text: #0f172a;
  --ui-subtext: #64748b;
  --ui-accent: #2563eb;
  --ui-accent-text: #ffffff;
  --ui-danger: #dc2626;
  --ui-warn: #a16207;
  --ui-btn-bg: #ffffff;
  --ui-btn-hover: #eef2ff;
  /* sidenote と共通のヒーロー配色 */
  --hero-bg: #eef0f3;
  --page-bg: #f4f5f7;
  --swatch-bg: #f2f2f2;
  --swatch-hover: #e8e8ea;
  --card-shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px -1px rgba(0,0,0,.1);
}

body.rg-dark {
  --ui-bg: #0b1220;
  --ui-panel: #111827;
  --ui-border: #1f2937;
  --ui-text: #e2e8f0;
  --ui-subtext: #94a3b8;
  --ui-accent: #60a5fa;
  --ui-accent-text: #0b1220;
  --ui-warn: #facc15;
  --ui-btn-bg: #1e293b;
  --ui-btn-hover: #24324a;
  --hero-bg: #0f1726;
  --page-bg: #0b1220;
  --swatch-bg: #1e293b;
  --swatch-hover: #24324a;
  --card-shadow: 0 1px 3px rgba(0,0,0,.5);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  font-family: 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  background: var(--page-bg);
  color: var(--ui-text);
}

body {
  padding: 28px 40px 60px;
  overflow-x: hidden;   /* .heroの100vwフルブリード対策 */
}

/* ---------- hero（sidenote / pdf-tools と同じ構成） ---------- */
.hero {
  width: 100vw; position: relative; left: 50%; margin: -28px 0 0 -50vw;
  padding: 64px 40px 44px; background: var(--hero-bg); border-bottom: 1px solid var(--ui-border);
}
.hero-inner { max-width: 1100px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.hero-title { font-size: 38px; font-weight: 700; line-height: 1.28; letter-spacing: -.5px; margin: 0 0 18px; }
.hero-desc { font-size: 22px; line-height: 1.7; color: var(--ui-subtext); margin: 0 0 24px; max-width: 18em; }
.btn-outline {
  font-size: 14px; height: 40px; padding: 0 16px; border-radius: 8px; font-weight: 500; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; white-space: nowrap;
}
.hero-shortcuts { margin-top: 20px; }
.hero-shortcuts-title { font-size: 12px; font-weight: 600; color: var(--ui-subtext); margin-bottom: 6px; }
.hero-shortcuts ul { list-style: none; margin: 0; padding: 0; font-size: 12.5px; line-height: 1.9; color: var(--ui-subtext); }
.hero-shortcuts li::before { content: "・"; }
.hero-theme-section { margin-top: 28px; }
.hero-theme-head { margin-bottom: 12px; }
.hero-theme-title { font-size: 16px; font-weight: 700; }
.theme-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-width: 460px; }
.theme-swatch {
  height: 40px; padding: 0 8px; border: 1px solid var(--ui-border); background: var(--swatch-bg); border-radius: 8px;
  font-size: 13px; font-weight: 500; color: var(--ui-text); cursor: pointer; text-align: center;
  box-shadow: var(--card-shadow); transition: box-shadow .15s, background .15s;
}
.theme-swatch:hover { background: var(--swatch-hover); }
.theme-swatch.active { background: var(--ui-text); color: var(--ui-bg); border-color: var(--ui-text); font-weight: 700; }
.browser-mock { border: 1px solid var(--ui-border); border-radius: 14px; overflow: hidden; background: var(--ui-panel); box-shadow: 0 25px 50px -12px rgba(0,0,0,.25); }
.browser-mock-bar { height: 38px; display: flex; align-items: center; gap: 7px; padding: 0 14px; background: var(--swatch-bg); border-bottom: 1px solid var(--ui-border); }
.browser-mock-bar .dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.dot-red { background: #ff5f57; } .dot-yellow { background: #ffbd2e; } .dot-green { background: #28c840; }
.browser-mock-url { margin-left: 10px; font-size: 11.5px; color: var(--ui-subtext); background: var(--ui-panel); border: 1px solid var(--ui-border); border-radius: 999px; padding: 3px 12px; flex: 1 1 auto; }
.browser-mock-body { background: var(--swatch-bg); padding: 22px; }
.mock-paper { background: var(--ui-panel); border: 1px solid var(--ui-border); border-radius: 10px; box-shadow: var(--card-shadow); padding: 16px; }

/* ---------- 編集画面（カード） ---------- */
.editor-card {
  display: flex; flex-direction: column;
  height: max(640px, calc(100vh - 56px));
  max-width: 1500px; margin: 32px auto 0;
  background: var(--ui-panel); border: 1px solid var(--ui-border); border-radius: 14px;
  box-shadow: var(--card-shadow); overflow: hidden;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: 13px;
  color: var(--ui-text);
}

button {
  background: var(--ui-btn-bg);
  border: 1px solid var(--ui-border);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
}
button:hover { background: var(--ui-btn-hover); }
button:disabled { opacity: 0.4; cursor: default; }
button.active {
  background: var(--ui-accent);
  color: var(--ui-accent-text);
  border-color: var(--ui-accent);
}
button.danger-btn {
  color: var(--ui-danger);
  border-color: var(--ui-danger);
  margin-top: 10px;
  width: 100%;
}

input[type="text"], input[type="number"], select, textarea {
  background: var(--ui-panel);
  border: 1px solid var(--ui-border);
  border-radius: 6px;
  padding: 5px 8px;
}

/* ---------- header / toolbar ---------- */
.app-header {
  flex: 0 0 auto;
  background: var(--ui-panel);
  border-bottom: 1px solid var(--ui-border);
  padding: 8px 14px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 6px;
}
.brand-mark { font-size: 18px; color: var(--ui-accent); }
.brand-name { font-size: 17px; font-weight: 800; letter-spacing: 0.02em; }
.brand-sub { font-size: 12px; color: var(--ui-subtext); }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-bottom: 6px;
}
.toolbar-secondary { margin-bottom: 0; }

.tool-group {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-right: 14px;
  border-right: 1px solid var(--ui-border);
}
.tool-group:last-child { border-right: none; }

.group-label { font-size: 12px; color: var(--ui-subtext); margin-right: 2px; }
.grid-size-label { display: flex; align-items: center; gap: 4px; font-size: 12px; color: var(--ui-subtext); }
.grid-size-label input { width: 46px; }
.checkbox-label { display: flex; align-items: center; gap: 4px; font-size: 12px; color: var(--ui-subtext); }
.zoom-label { font-size: 12px; color: var(--ui-subtext); min-width: 38px; text-align: center; }

/* ---------- main layout ---------- */
.app-main {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 300px;
  min-height: 0;
  min-width: 0;
}
.app-main.text-collapsed { grid-template-columns: 36px minmax(0, 1fr) 300px; }

.panel {
  min-height: 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--ui-border);
  background: var(--ui-panel);
}
.panel-canvas { border-right: 1px solid var(--ui-border); background: var(--ui-bg); }
.panel-inspector { border-right: none; overflow-y: auto; }

.panel-title {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ui-subtext);
  text-transform: uppercase;
  padding: 10px 12px 6px;
}

#dslText {
  flex: 1 1 auto;
  resize: none;
  border: none;
  outline: none;
  padding: 4px 12px 12px;
  font-family: 'Cascadia Code', 'Consolas', monospace;
  font-size: 12.5px;
  line-height: 1.6;
  background: transparent;
}

.panel-text { position: relative; }
.panel-collapse-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 2px 4px;
  font-size: 11px;
  color: var(--ui-subtext);
  text-transform: none;
  letter-spacing: normal;
}
.panel-collapse-btn:hover { color: var(--ui-text); }

.panel-expand-strip {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  position: absolute;
  inset: 0;
  width: 100%;
  padding-top: 14px;
  background: var(--ui-panel);
  border: none;
  border-right: 1px solid var(--ui-border);
  cursor: pointer;
  color: var(--ui-subtext);
}
.panel-expand-strip:hover { color: var(--ui-text); background: var(--ui-btn-hover); }
.panel-expand-label { writing-mode: vertical-rl; font-size: 11px; letter-spacing: 0.06em; white-space: nowrap; }

.panel-text.collapsed .panel-title,
.panel-text.collapsed #dslText { display: none; }
.panel-text.collapsed .panel-expand-strip { display: flex; }

.canvas-viewport {
  flex: 1 1 auto;
  overflow: auto;
  padding: 20px;
}
.canvas-viewport svg { display: block; }
.canvas-viewport.tool-add-node,
.canvas-viewport.tool-note { cursor: copy; }
.canvas-viewport.tool-connect { cursor: crosshair; }
.canvas-viewport.tool-zone { cursor: cell; }

/* ---------- inspector ---------- */
#inspector { padding: 6px 12px 20px; }
.inspector-form h3 { font-size: 13px; margin: 4px 0 10px; }
.inspector-form .field { margin-bottom: 12px; }
.inspector-form label { display: block; font-size: 11.5px; color: var(--ui-subtext); margin-bottom: 4px; }
.inspector-form input[type="text"],
.inspector-form textarea,
.inspector-form select { width: 100%; }
.inspector-form input[type="range"] { width: 100%; }
.pos-row { display: flex; gap: 6px; }
.pos-row input { width: 100%; }
.hint { font-size: 12px; color: var(--ui-subtext); line-height: 1.5; }

.icon-picker { border: 1px solid var(--ui-border); border-radius: 8px; padding: 6px; }
.icon-search { width: 100%; margin-bottom: 6px; }
.icon-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 4px;
  max-height: 160px;
  overflow-y: auto;
}
.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5px;
  aspect-ratio: 1;
}
.icon-btn.active { background: var(--ui-accent); color: var(--ui-accent-text); border-color: var(--ui-accent); }

.color-picker { display: flex; flex-wrap: wrap; gap: 6px; }
.color-btn {
  width: 26px; height: 26px; border-radius: 50%;
  padding: 0; border: 2px solid transparent;
}
.color-btn.active { border-color: var(--ui-text); }

/* ---------- status bar ---------- */
.status-bar {
  flex: 0 0 auto;
  min-height: 26px;
  padding: 4px 14px;
  font-size: 12px;
  color: var(--ui-subtext);
  background: var(--ui-panel);
  border-top: 1px solid var(--ui-border);
}
.status-bar.status-error { color: var(--ui-danger); }
.status-bar.status-warn { color: var(--ui-warn); }

/* ---------- help panel ---------- */
.help-panel {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.help-panel-inner {
  position: relative;
  background: var(--ui-panel);
  border-radius: 12px;
  padding: 22px 26px;
  max-width: 640px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.help-panel-inner h2 { margin-top: 0; font-size: 16px; }
.help-panel-inner h2 ~ h2 { margin-top: 4px; }
.help-panel-inner hr { border: none; border-top: 1px solid var(--ui-border); margin: 20px 0; }
.claude-steps { font-size: 13px; line-height: 1.7; padding-left: 20px; margin: 10px 0; }
.claude-prompt-wrap { display: flex; flex-direction: column; gap: 8px; }
.claude-prompt {
  width: 100%;
  font-family: 'Cascadia Code', 'Consolas', monospace;
  font-size: 11.5px;
  line-height: 1.6;
  background: var(--ui-bg);
  border: 1px solid var(--ui-border);
  border-radius: 8px;
  padding: 10px;
  resize: vertical;
}
#claudePromptCopyBtn { align-self: flex-start; }
.help-panel-inner pre {
  background: var(--ui-bg);
  border: 1px solid var(--ui-border);
  border-radius: 8px;
  padding: 12px;
  font-size: 12px;
  overflow-x: auto;
  line-height: 1.6;
}
.help-close {
  position: absolute; top: 10px; right: 10px;
  border: none; background: none; font-size: 18px; line-height: 1;
}

/* ---------- SVG element interaction states ---------- */
.rg-node, .rg-edge, .rg-zone, .rg-note { cursor: pointer; }
.rg-node.selected circle { stroke-width: 3.5; filter: drop-shadow(0 0 0 rgba(37,99,235,0.5)); }
.rg-node.selected { outline: none; }
.rg-node.connecting circle { stroke-dasharray: 4 3; }
.rg-edge.selected line:nth-child(2) { stroke-width: 3; }
.rg-zone.selected rect { stroke-width: 3; }
.rg-note.selected rect { stroke-width: 2.4; }

/* ---------- responsive fallback ---------- */
@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-title { font-size: 30px; }
}
@media (max-width: 600px) {
  body { padding-left: 16px; padding-right: 16px; }
  .hero { padding-left: 20px; padding-right: 20px; }
  .theme-grid { grid-template-columns: repeat(2, 1fr); max-width: none; }
}
@media (max-width: 980px) {
  .editor-card { height: auto; }
  .app-main { grid-template-columns: 1fr; grid-auto-rows: 240px 1fr 240px; }
  .panel { border-right: none; border-bottom: 1px solid var(--ui-border); }
}