:root {
  color-scheme: dark;
  --bg: #0f0f0f;
  --bg-elevated: #1a1a1a;
  --bg-hover: #252525;
  --bg-active: #303030;
  --fg: #e4e4e4;
  --fg-dim: #888;
  --fg-faint: #555;
  --accent: #7dd3c0;
  --accent-fg: #001a14;
  --border: #2a2a2a;
  --glow: transparent;

  /* Paper (canvas stage). テーマを変えても紙は白維持 */
  --paper: #ffffff;
  --paper-ink: #555;
  --paper-grid: #d8d8d8;
  --paper-dot: #b8b8b8;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
}

/* 黒板モード: 紙色を黒に。PAPERは軸が独立してテーマ横断で効く */
:root[data-paper="board"] {
  --paper: #0a0a0a;
  --paper-ink: #e0e0e0;
  --paper-grid: #1e2230;
  --paper-dot: #2a3040;
}

/* Auto: OS設定に追従。明るい環境では紙色もそのまま、UIだけ切替 */
@media (prefers-color-scheme: light) {
  :root[data-theme="auto"] {
    color-scheme: light;
    --bg: #fafaf9;
    --bg-elevated: #ffffff;
    --bg-hover: #f1f0ee;
    --bg-active: #e7e5e4;
    --fg: #1c1917;
    --fg-dim: #78716c;
    --fg-faint: #a8a29e;
    --accent: #2563eb;
    --accent-fg: #ffffff;
    --border: #e7e5e4;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f0f0f;
  --bg-elevated: #1a1a1a;
  --bg-hover: #252525;
  --bg-active: #303030;
  --fg: #e4e4e4;
  --fg-dim: #888;
  --fg-faint: #555;
  --accent: #7dd3c0;
  --accent-fg: #001a14;
  --border: #2a2a2a;
}

:root[data-theme="pink"] {
  color-scheme: dark;
  --bg: #0a040a;
  --bg-elevated: #1a081a;
  --bg-hover: #2a0f28;
  --bg-active: #3a1438;
  --fg: #ffc8f0;
  --fg-dim: #c850a0;
  --fg-faint: #7a3060;
  --accent: #ff26b3;
  --accent-fg: #1a0010;
  --border: #3a1028;
  --glow: #ff26b3;
}

:root[data-theme="cyber"] {
  color-scheme: dark;
  --bg: #030a06;
  --bg-elevated: #081a0f;
  --bg-hover: #0e2a18;
  --bg-active: #163a22;
  --fg: #B2FFCA;
  --fg-dim: #70d090;
  --fg-faint: #407050;
  --accent: #39ff77;
  --accent-fg: #001a0a;
  --border: #143a24;
  --glow: #39ff77;
}

/* ネオン系: スキャンライン（ごく薄く） */
:root[data-theme="pink"] body::before,
:root[data-theme="cyber"] body::before {
  content: "";
  position: fixed; inset: 0;
  background: repeating-linear-gradient(0deg,
    rgba(255,255,255,0.03) 0px, rgba(255,255,255,0.03) 1px,
    transparent 1px, transparent 3px);
  pointer-events: none;
  z-index: 1;
}

/* ==== 基本 ==== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  height: 100dvh;
  overflow: hidden;
}
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  display: grid;
  grid-template-rows: auto 1fr;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

/* ==== ヘッダー(ツールバー) ==== */
.bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  padding-top: max(8px, env(safe-area-inset-top));
  padding-left: max(12px, env(safe-area-inset-left));
  padding-right: max(12px, env(safe-area-inset-right));
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  position: relative;
  z-index: 10;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.bar::-webkit-scrollbar { height: 4px; }
.bar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent);
  flex-shrink: 0;
}
:root[data-theme="pink"] .title,
:root[data-theme="cyber"] .title {
  text-shadow: 0 0 8px var(--glow);
}

.group {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 4px;
  border-left: 1px solid var(--border);
  flex-shrink: 0;
}
.group:first-of-type { border-left: none; }
.group .label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-dim);
  letter-spacing: 0.5px;
  margin-right: 2px;
}

.spacer { flex: 1; min-width: 4px; }

/* ボタン共通 */
button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 6px 10px;
  font-family: inherit;
  font-size: 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s, box-shadow 0.12s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  flex-shrink: 0;
  min-height: 32px;
}
button:hover { background: var(--bg-hover); }
button:active { background: var(--bg-active); }
button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* アクティブ状態のツール */
.tool-btn.active {
  background: var(--bg-active);
  border-color: var(--accent);
  color: var(--accent);
}
:root[data-theme="pink"] .tool-btn.active,
:root[data-theme="cyber"] .tool-btn.active {
  box-shadow: 0 0 8px color-mix(in srgb, var(--glow) 60%, transparent);
}

/* アクセントボタン */
button.accent {
  background: var(--accent);
  color: var(--accent-fg);
  border-color: var(--accent);
  font-weight: 600;
}
button.accent:hover {
  filter: brightness(1.1);
  background: var(--accent);
}
:root[data-theme="pink"] button.accent,
:root[data-theme="cyber"] button.accent {
  box-shadow: 0 0 10px color-mix(in srgb, var(--glow) 50%, transparent);
}

/* 色ボタン */
.colors { gap: 3px; }
.color-btn {
  width: 26px;
  height: 26px;
  min-height: 26px;
  padding: 0;
  border-radius: 50%;
  border: 2px solid var(--border);
  position: relative;
}
/* 色はインラインstyleを使わず data-color 属性で割り当て（CSP厳格化対応） */
.color-btn[data-color="#111111"] { background: #111111; }
.color-btn[data-color="#e53935"] { background: #e53935; }
.color-btn[data-color="#fb8c00"] { background: #fb8c00; }
.color-btn[data-color="#fdd835"] { background: #fdd835; }
.color-btn[data-color="#43a047"] { background: #43a047; }
.color-btn[data-color="#1e88e5"] { background: #1e88e5; }
.color-btn[data-color="#8e24aa"] { background: #8e24aa; }
.color-btn:hover { transform: scale(1.1); }
.color-btn.active {
  border-color: var(--fg);
  box-shadow: 0 0 0 2px var(--bg-elevated), 0 0 0 3px var(--accent);
}
.page-sep { color: var(--fg-dim); }
.color-picker {
  width: 26px;
  height: 26px;
  padding: 0;
  border: 2px solid var(--border);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  overflow: hidden;
}
.color-picker::-webkit-color-swatch-wrapper { padding: 0; }
.color-picker::-webkit-color-swatch { border: none; border-radius: 50%; }
.color-picker::-moz-color-swatch { border: none; border-radius: 50%; }

/* 太さスライダー */
.size input[type="range"] {
  width: 80px;
  accent-color: var(--accent);
  cursor: pointer;
}
.size-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-dim);
  min-width: 20px;
  text-align: right;
}

/* ページボタン */
.page-btn {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.5px;
  min-width: 56px;
  justify-content: center;
}
.page-btn span { font-size: 11px; }
.page-btn #page-cur {
  color: var(--accent);
  font-size: 13px;
}
:root[data-theme="pink"] .page-btn #page-cur,
:root[data-theme="cyber"] .page-btn #page-cur {
  text-shadow: 0 0 6px var(--glow);
}

/* ==== ステージ（キャンバス領域） ==== */
.stage {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  touch-action: none;
  overscroll-behavior: contain;
  z-index: 2;
}
/* 背景: 方眼 */
:root[data-bg="grid"] .stage {
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, var(--paper-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--paper-grid) 1px, transparent 1px);
  background-size: 24px 24px;
}
/* 背景: ドット */
:root[data-bg="dot"] .stage {
  background-color: var(--paper);
  background-image: radial-gradient(var(--paper-dot) 1.2px, transparent 1.2px);
  background-size: 20px 20px;
}

#canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: crosshair;
}

/* ==== 復元バナー ==== */
.restore {
  position: fixed;
  top: calc(env(safe-area-inset-top) + 56px);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  z-index: 20;
  box-shadow: 0 6px 24px rgba(0,0,0,0.4);
  font-size: 13px;
  max-width: calc(100vw - 24px);
  flex-wrap: wrap;
  justify-content: center;
}
.restore[hidden] { display: none; }

/* ==== 設定パネル ==== */
.panel {
  position: fixed;
  top: calc(env(safe-area-inset-top) + 54px);
  right: max(12px, env(safe-area-inset-right));
  display: grid;
  gap: 8px;
  padding: 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  z-index: 20;
  box-shadow: 0 6px 24px rgba(0,0,0,0.4);
  min-width: 240px;
  max-width: calc(100vw - 24px);
  opacity: 0;
  transform: translateY(-8px);
  pointer-events: none;
  transition: opacity 0.15s, transform 0.15s;
}
.panel.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.panel-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.panel-row .label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-dim);
  letter-spacing: 0.8px;
  min-width: 44px;
}
.panel-row button.active {
  background: var(--bg-active);
  border-color: var(--accent);
  color: var(--accent);
}
.panel-row.tips {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--fg-faint);
  letter-spacing: 0.3px;
  padding-top: 4px;
  border-top: 1px dashed var(--border);
}

/* ==== トースト通知 ==== */
.notice {
  position: fixed;
  bottom: calc(env(safe-area-inset-bottom) + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(160%);
  background: var(--bg-elevated);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 12px;
  letter-spacing: 0.3px;
  z-index: 200;
  transition: transform 0.25s ease;
  max-width: calc(100vw - 32px);
  pointer-events: none;
}
.notice.open { transform: translateX(-50%) translateY(0); }

/* ==== About モーダル ==== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 300;
  padding: 16px;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--bg-elevated);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  max-width: 560px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 20px 24px;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.6;
  -webkit-user-select: text;
  user-select: text;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}
:root[data-theme="pink"] .modal,
:root[data-theme="cyber"] .modal {
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.5),
    0 0 24px color-mix(in srgb, var(--glow) 25%, transparent);
}
.modal h2 {
  font-size: 16px;
  margin: 0 0 4px;
  letter-spacing: 1px;
  color: var(--accent);
}
:root[data-theme="pink"] .modal h2,
:root[data-theme="cyber"] .modal h2 {
  text-shadow: 0 0 10px var(--glow);
}
.modal h3 {
  font-size: 11px;
  font-weight: 700;
  margin: 18px 0 6px;
  color: var(--fg-dim);
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.modal p {
  margin: 4px 0;
  font-size: 12.5px;
  color: var(--fg);
}
.modal .modal-version {
  color: var(--fg-dim);
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}
.modal .modal-hint {
  color: var(--fg-dim);
  font-size: 11.5px;
}
.modal pre {
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--fg-dim);
  font-size: 11px;
  font-family: var(--font-mono);
  margin: 6px 0;
}
.modal a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.modal a:hover { filter: brightness(1.15); }
.modal-close {
  float: right;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 11px;
  cursor: pointer;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}
.modal-close:hover {
  background: var(--bg-hover);
  border-color: var(--accent);
  color: var(--accent);
}

/* ==== モバイル集約要素のデフォルト非表示 ==== */
.mobile-only { display: none; }

/* ==== モバイル: ヘッダー集約／ボトムシート ==== */
@media (max-width: 860px) {
  .title { display: none; }
  .desktop-only { display: none !important; }
  .mobile-only { display: flex; }

  .bar { gap: 6px; padding: 6px 8px; overflow-x: visible; }
  .group { padding: 0 2px; gap: 3px; }
  button { min-height: 36px; padding: 7px 10px; }
  button#save span { display: none; }

  /* パネル: ボトムシート化 */
  .panel {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: none;
    min-width: 0;
    width: 100%;
    border-radius: 14px 14px 0 0;
    max-height: 80vh;
    overflow-y: auto;
    transform: translateY(100%);
    padding: 14px 14px calc(14px + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.5);
    -webkit-overflow-scrolling: touch;
  }
  .panel.open { transform: translateY(0); }

  /* パネル内の要素を指で押しやすく */
  .panel-row {
    gap: 8px;
    padding: 4px 0;
  }
  .panel-row .label {
    min-width: 52px;
    font-size: 11px;
  }
  .panel button {
    min-height: 40px;
    padding: 8px 14px;
  }

  /* モバイル版 COLOR 行: 折返し可能、ボタン大きめ */
  .m-colors {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    flex: 1;
    align-items: center;
  }
  .m-colors .color-btn {
    width: 34px;
    height: 34px;
    min-height: 34px;
  }
  .m-colors .color-picker {
    width: 34px;
    height: 34px;
  }

  /* モバイル版 SIZE 行: スライダーを伸ばす */
  .m-size-row .m-size {
    flex: 1;
    min-width: 120px;
    height: 32px;
  }
  .m-size-row .m-size-num {
    font-size: 13px;
    min-width: 28px;
  }

  /* モバイル版 PAGE 行 */
  .m-page {
    font-family: var(--font-mono);
    font-weight: 700;
    min-width: 44px;
    justify-content: center;
  }
  .m-page-cur {
    font-family: var(--font-mono);
    font-weight: 700;
    color: var(--accent);
    font-size: 15px;
    min-width: 20px;
    text-align: center;
  }
  :root[data-theme="pink"] .m-page-cur,
  :root[data-theme="cyber"] .m-page-cur {
    text-shadow: 0 0 8px var(--glow);
  }

  /* モバイル版 OPS ボタン */
  .m-op { flex: 1; justify-content: center; }
}

@media (max-width: 640px) {
  .m-colors .color-btn,
  .m-colors .color-picker {
    width: 30px;
    height: 30px;
    min-height: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  button, .panel, .notice, .restore { transition: none !important; }
}

/* GLOW OFF: 発光系を無効化 */
:root[data-glow="off"] .title,
:root[data-glow="off"] .tool-btn.active,
:root[data-glow="off"] button.accent {
  text-shadow: none !important;
  box-shadow: none !important;
}
:root[data-glow="off"] body::before {
  display: none !important;
}