/* app.css — app chrome: base/reset, #app layout, header, toolbar, selection menu, dialogs, settings,
 * banners, toasts, welcome screen (module F2b). The paper page itself (.page, .grid, .event,
 * .sticky-header contents, month cells) lives in styles/views.css (F1) and is not styled here.
 *
 * Shared classes (use these from any module):
 *   .btn                 44px-tall button (neutral, bordered)
 *     .btn-primary       accent fill, white text            (e.g. 「保存」「Googleでログイン」)
 *     .btn-danger        red text on a soft red fill        (e.g. 「削除」)
 *     .btn-ghost         no border/fill, accent text
 *     .btn-sm            36px visual height (hit area stays ≥ 44px)
 *     .btn-block         full width
 *   .icon-btn            44×44 transparent icon button (put svgIcon() inside)
 *   .chip                small pill (32px visual, ≥ 44px hit area); data-tone="accent|warn|muted"
 *   .switch              iOS-like toggle: <label class="switch-row"><span class="switch-text">…</span>
 *                        <span class="switch"><input type="checkbox" role="switch"><span class="switch-track"></span></span></label>
 *                        (dom.js switchControl() builds it)
 *   .seg                 segmented control: <div class="seg"><button aria-pressed="true"><span>日</span></button>…</div>
 *   .input / .select / .textarea   form controls (16px+ text: no iOS zoom on focus)
 *   .field, .field-label, .hint, .field-error, .note, .card-group, .sr-only
 *   .dialog              modal sheet (dom.js openModal(): .dialog-backdrop > .dialog > .dialog-header/.dialog-body/.dialog-footer)
 *   .banner              the row under the header; data-kind="info|warn|error" (toast.js showBanner())
 *   .toast               bottom-center message above the toolbar (toast.js toast())
 *   .welcome             welcome card rendered by main.js directly inside #dialog-root:
 *                        <div class="welcome"><h1>…</h1><p>…</p><ul><li>…</li></ul>
 *                        <button class="btn btn-primary">…</button><button class="btn">…</button>
 *                        <p class="note">…</p></div>   (.welcome-actions may wrap the buttons)
 * Utilities: [hidden] always hides; .sr-only (visually hidden, still read by VoiceOver).
 */

/* ---------------------------------------------------------------- tokens */

:root {
  color-scheme: light dark;

  --font: -apple-system, BlinkMacSystemFont, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-text: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --on-accent: #ffffff;
  --red: #dc2626;
  --blue: #2563eb;
  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.1);
  --danger-soft-strong: rgba(220, 38, 38, 0.18);
  --ok-text: #15803d;
  --warn-text: #b45309;
  --swatch-edge: rgba(0, 0, 0, 0.12);

  --paper: #fffdf8;
  --app-bg: #f2f0ea;
  --surface: #fffdf8;
  --surface-elevated: #ffffff;
  --surface-2: #f5f4f0;
  --surface-3: #eae8e2;
  --group-bg: #f6f5f1;
  --chrome-bg: rgba(255, 253, 248, 0.82);
  --seg-bg: rgba(118, 118, 128, 0.12);
  --input-bg: #ffffff;

  --text: #1f2937;
  --text-2: #4b5563;
  --text-3: #6b7280;
  --text-4: #9ca3af;
  --line: #e5e7eb;
  --line-strong: #d1d5db;

  --switch-off: #e3e3e8;
  --backdrop: rgba(17, 24, 39, 0.36);
  --menu-bg: rgba(17, 24, 39, 0.9);
  --toast-bg: rgba(31, 41, 55, 0.96);
  --toast-error-bg: rgba(153, 27, 27, 0.96);
  --toast-text: #f9fafb;
  --toast-action: #93c5fd;

  --info-bg: #eff6ff;
  --info-text: #1e40af;
  --info-line: #bfdbfe;
  --warn-bg: #fffbeb;
  --warn-fg: #92400e;
  --warn-line: #fde68a;
  --error-bg: #fef2f2;
  --error-fg: #991b1b;
  --error-line: #fecaca;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --shadow-1: 0 1px 2px rgba(17, 24, 39, 0.06), 0 1px 1px rgba(17, 24, 39, 0.04);
  --shadow-2: 0 8px 28px rgba(17, 24, 39, 0.14), 0 2px 6px rgba(17, 24, 39, 0.08);
  --shadow-3: 0 24px 64px rgba(17, 24, 39, 0.24), 0 4px 12px rgba(17, 24, 39, 0.1);

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);

  --safe-t: env(safe-area-inset-top, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);

  --header-h: 52px;
  --toolbar-h: 60px;
  --toolbar-gap: 12px;
  /* Room the floating toolbar needs at the bottom (excluding the safe area). */
  --toolbar-space: calc(var(--toolbar-h) + var(--toolbar-gap) * 2);
}

/* Dark mode: only the chrome (header, toolbar, dialogs…) follows it; the paper page stays light (views.css). */
@media (prefers-color-scheme: dark) {
  :root {
    --accent: #2563eb;
    --accent-hover: #1e40af;
    --accent-text: #60a5fa;
    --accent-soft: rgba(96, 165, 250, 0.18);
    --danger: #f87171;
    --danger-soft: rgba(248, 113, 113, 0.14);
    --danger-soft-strong: rgba(248, 113, 113, 0.24);
    --ok-text: #4ade80;
    --warn-text: #fbbf24;
    --red: #f87171;
    --swatch-edge: rgba(255, 255, 255, 0.35);

    --app-bg: #161618;
    --surface: #1f1f22;
    --surface-elevated: #262629;
    --surface-2: #2e2e32;
    --surface-3: #3a3a3f;
    --group-bg: #2e2e32;
    --chrome-bg: rgba(31, 31, 34, 0.84);
    --seg-bg: rgba(118, 118, 128, 0.24);
    --input-bg: #1c1c1f;

    --text: #f4f4f5;
    --text-2: #d4d4d8;
    --text-3: #a1a1aa;
    --text-4: #71717a;
    --line: #36363c;
    --line-strong: #4a4a52;

    --switch-off: #3f3f46;
    --backdrop: rgba(0, 0, 0, 0.55);
    --menu-bg: rgba(63, 63, 70, 0.94);
    --toast-bg: rgba(63, 63, 70, 0.97);

    --info-bg: #172036;
    --info-text: #bfdbfe;
    --info-line: #1e3a8a;
    --warn-bg: #2b2210;
    --warn-fg: #fde68a;
    --warn-line: #78350f;
    --error-bg: #2d1515;
    --error-fg: #fecaca;
    --error-line: #7f1d1d;

    --shadow-2: 0 8px 28px rgba(0, 0, 0, 0.45), 0 2px 6px rgba(0, 0, 0, 0.3);
    --shadow-3: 0 24px 64px rgba(0, 0, 0, 0.6), 0 4px 12px rgba(0, 0, 0, 0.35);
  }
}

/* ---------------------------------------------------------------- base / reset */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
  background: var(--app-bg);
  /* Blocks pinch and double-tap zoom; one-finger scrolling keeps working (SPEC §7). */
  touch-action: pan-x pan-y;
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  background: var(--app-bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

[hidden] {
  display: none !important;
}

button,
input,
select,
textarea {
  margin: 0;
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
}

button:disabled {
  cursor: default;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.icon {
  display: block;
  flex: none;
}

:where(button, a, input, select, textarea, [tabindex]):focus {
  outline: none;
}

:where(button, a, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------------------------------------------------------------- layout (SPEC §8) */

#app {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto auto auto minmax(0, 1fr);
  grid-template-areas:
    'header'
    'banner'
    'sticky'
    'viewport';
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--app-bg);
}

#app > .app-header { grid-area: header; }
#app > .banner { grid-area: banner; }
#app > .sticky-header { grid-area: sticky; min-width: 0; }
#app > .viewport { grid-area: viewport; }

/* The scroll container. No padding: views size the page from its clientWidth/clientHeight. */
.viewport {
  position: relative;
  z-index: 0; /* own stacking context: the page's canvases (z 3–5) stay below the floating chrome */
  min-width: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  background: var(--app-bg);
}

.viewport:focus {
  outline: none;
}

/* Day/week pages scroll under the floating toolbar: leave room to scroll their end above it. */
.viewport::after {
  content: '';
  display: block;
  height: calc(var(--toolbar-space) + var(--safe-b));
}

/* Month (fit 'contain'; since 1.0.5 fit 'grid': the grid fills the screen, its メモ欄 is scrolled to) must not
   hide under the toolbar: give the toolbar its own strip. main.js sets #app[data-fit] before the page is
   measured, so the first layout already has the right height; :has() covers the page attribute too. */
#app:has(.page[data-fit='contain']) > .viewport,
#app:has(.page[data-fit='grid']) > .viewport,
#app[data-fit='contain'] > .viewport,
#app[data-fit='grid'] > .viewport {
  margin-bottom: calc(var(--toolbar-space) + var(--safe-b) - var(--toolbar-gap));
}

.viewport:has(> .page[data-fit='contain'])::after,
.viewport:has(> .page[data-fit='grid'])::after,
#app[data-fit='contain'] > .viewport::after,
#app[data-fit='grid'] > .viewport::after {
  display: none;
}

/* Modal host: covers the screen only where it has content (dialogs, welcome). */
#dialog-root {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
}

#dialog-root > * {
  pointer-events: auto;
}

/* ---------------------------------------------------------------- shared controls */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-elevated);
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.15s, border-color 0.15s, opacity 0.15s;
  -webkit-appearance: none;
  appearance: none;
}

.btn:not(:disabled):active { background: var(--surface-3); }
.btn:disabled { opacity: 0.45; }

.btn-primary {
  border-color: transparent;
  background: var(--accent);
  color: var(--on-accent);
}

.btn-primary:not(:disabled):active { background: var(--accent-hover); }

.btn-danger {
  border-color: transparent;
  background: var(--danger-soft);
  color: var(--danger);
}

.btn-danger:not(:disabled):active { background: var(--danger-soft-strong); }

.btn-ghost {
  border-color: transparent;
  background: transparent;
  color: var(--accent-text);
}

.btn-ghost:not(:disabled):active { background: var(--accent-soft); }

.btn-sm {
  min-height: 36px;
  padding: 0 14px;
  border-radius: 10px;
  font-size: 14px;
}

.btn-sm::after {
  content: '';
  position: absolute;
  inset: -4px 0;
}

.btn-block {
  width: 100%;
}

@media (hover: hover) {
  .btn:not(:disabled):hover { background: var(--surface-2); }
  .btn-primary:not(:disabled):hover { background: var(--accent-hover); }
  .btn-danger:not(:disabled):hover { background: var(--danger-soft-strong); }
  .btn-ghost:not(:disabled):hover { background: var(--accent-soft); }
}

.icon-btn {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-2);
  transition: background-color 0.15s, color 0.15s;
}

.icon-btn:not(:disabled):active { background: var(--surface-3); }

@media (hover: hover) {
  .icon-btn:not(:disabled):hover {
    background: var(--surface-2);
    color: var(--text);
  }
}

.chip {
  position: relative;
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 12px 0 9px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: var(--surface-elevated);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.chip::after {
  content: '';
  position: absolute;
  inset: -6px -2px; /* ≥ 44px hit area */
}

.chip:not(:disabled):active { background: var(--surface-3); }
.chip:disabled { opacity: 0.6; }

.chip[data-tone='accent'] {
  border-color: transparent;
  background: var(--accent-soft);
  color: var(--accent-text);
}

.chip[data-tone='warn'] {
  border-color: var(--warn-line);
  background: var(--warn-bg);
  color: var(--warn-fg);
}

.chip[data-tone='muted'] {
  border-color: transparent;
  background: var(--seg-bg);
  color: var(--text-2);
}

/* Segmented control: 44px-tall buttons; the pill look is drawn by pseudo-elements. */
.seg {
  position: relative;
  display: inline-flex;
  flex: none;
  align-items: stretch;
  height: 44px;
  padding: 0 3px;
}

.seg::before {
  content: '';
  position: absolute;
  inset: 5px 0;
  border-radius: 10px;
  background: var(--seg-bg);
}

.seg > button {
  position: relative;
  min-width: 46px;
  height: 44px;
  padding: 0 12px;
  border: 0;
  background: none;
  color: var(--text-2);
  font-size: 15px;
  font-weight: 600;
}

.seg > button::before {
  content: '';
  position: absolute;
  inset: 8px 0;
  border-radius: 8px;
  transition: background-color 0.15s, box-shadow 0.15s;
}

.seg > button > span {
  position: relative;
}

.seg > button[aria-pressed='true'] {
  color: var(--text);
}

.seg > button[aria-pressed='true']::before {
  background: var(--surface-elevated);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.14), 0 0 0 0.5px rgba(0, 0, 0, 0.05);
}

.seg > button:focus-visible {
  outline-offset: -4px;
}

.seg--wide {
  display: flex;
  width: 100%;
}

.seg--wide > button {
  flex: 1 1 0;
}

/* iOS-like switch */
.switch {
  position: relative;
  flex: none;
  width: 51px;
  height: 31px;
}

.switch input {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
}

.switch-track {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-pill);
  background: var(--switch-off);
  transition: background-color 0.2s;
}

.switch-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 27px;
  height: 27px;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2), 0 0 0 0.5px rgba(0, 0, 0, 0.05);
  transition: transform 0.22s var(--ease);
}

.switch input:checked + .switch-track { background: var(--accent); }
.switch input:checked + .switch-track::after { transform: translateX(20px); }
.switch input:focus-visible + .switch-track { outline: 2px solid var(--accent); outline-offset: 2px; }
.switch input:disabled { cursor: default; }
.switch input:disabled + .switch-track { opacity: 0.5; }

.switch-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 8px 14px;
  cursor: pointer;
}

.switch-text {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.switch-label {
  font-size: 16px;
}

.switch-hint {
  color: var(--text-3);
  font-size: 12.5px;
  line-height: 1.45;
}

/* Grouped rows (iOS inset list) */
.card-group {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--group-bg);
}

.card-group > * + * {
  border-top: 1px solid var(--line);
}

/* ---------------------------------------------------------------- form fields */

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.field-label {
  color: var(--text-2);
  font-size: 13px;
  font-weight: 600;
}

.input {
  display: block;
  width: 100%;
  min-width: 0;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 16px; /* < 16px makes iOS zoom in on focus */
  line-height: 1.4;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.input::placeholder {
  color: var(--text-4);
  opacity: 1;
}

.input:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.input:disabled {
  background: var(--surface-2);
  color: var(--text-2);
  -webkit-text-fill-color: var(--text-2);
  opacity: 1;
}

.input-title {
  min-height: 56px;
  padding: 12px 14px;
  font-size: 20px;
  font-weight: 600;
}

.input-date,
.input-time {
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* WebKit date/time inputs: left-aligned value, stable height even when empty. */
.input::-webkit-date-and-time-value {
  min-height: 1.4em;
  margin: 0;
  text-align: left;
}

.input::-webkit-datetime-edit {
  padding: 0;
}

.input::-webkit-calendar-picker-indicator {
  opacity: 0.55;
}

.textarea {
  min-height: 92px;
  resize: vertical;
}

.select {
  padding-right: 38px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-position: right 12px center;
  background-repeat: no-repeat;
  background-size: 16px 16px;
  cursor: pointer;
}

.select:disabled {
  cursor: default;
}

/* Calendar color on the select's left edge (options can only show '●' text). */
.select.has-cal {
  box-shadow: inset 4px 0 0 var(--cal);
}

.select.has-cal:focus {
  box-shadow: inset 4px 0 0 var(--cal), 0 0 0 3px var(--accent-soft);
}

.hint {
  color: var(--text-3);
  font-size: 12.5px;
  line-height: 1.5;
}

.field-error {
  color: var(--danger);
  font-size: 13px;
  font-weight: 600;
}

.note {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 10px;
  background: var(--info-bg);
  color: var(--info-text);
  font-size: 13.5px;
  line-height: 1.5;
}

.note .icon {
  margin-top: 1px;
}

.field-grid {
  display: grid;
  gap: 12px;
}

.field-grid--timed {
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 1fr);
}

.field-grid--timed .field-end-date {
  grid-column: 1 / 2;
}

.field-grid--allday {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.cal-dot {
  flex: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--cal, #9ca3af);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1);
}

/* Round checkbox (calendar list) */
.check {
  flex: none;
  width: 26px;
  height: 26px;
  margin: 0;
  border: 2px solid var(--line-strong);
  border-radius: 50%;
  background: var(--input-bg) center / 16px 16px no-repeat;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  transition: background-color 0.15s, border-color 0.15s;
}

.check:checked {
  border-color: var(--accent);
  background-color: var(--accent);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E");
}

.is-shaking {
  animation: tc-shake 0.42s ease-in-out;
}

/* ---------------------------------------------------------------- header */

.app-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  min-height: calc(var(--header-h) + var(--safe-t));
  padding: var(--safe-t) max(8px, var(--safe-r)) 0 max(8px, var(--safe-l));
  border-bottom: 1px solid var(--line);
  background: var(--chrome-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-user-select: none;
  user-select: none;
}

.hdr-nav,
.hdr-actions {
  display: flex;
  flex: none;
  align-items: center;
}

.hdr-nav { gap: 0; }
.hdr-actions { gap: 4px; }

.btn-today {
  position: relative;
  height: 34px;
  margin: 0 2px;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: var(--surface-elevated);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
}

.btn-today::after {
  content: '';
  position: absolute;
  inset: -5px -2px;
}

.btn-today:active { background: var(--surface-3); }

.hdr-title {
  display: flex;
  flex: 1 1 auto;
  align-items: baseline;
  gap: 8px;
  min-width: 0;
  margin: 0 6px;
  overflow: hidden;
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.hdr-title-text {
  flex: 0 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  font-variant-numeric: tabular-nums;
}

.hdr-holiday {
  flex: 0 100 auto; /* gives way before the date does */
  min-width: 0;
  overflow: hidden;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: rgba(220, 38, 38, 0.1);
  color: var(--red);
  font-size: 12px;
  font-weight: 600;
  text-overflow: ellipsis;
}

.btn-add {
  position: relative;
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 3px;
  height: 36px;
  margin: 0 2px;
  padding: 0 14px 0 9px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
}

.btn-add::after {
  content: '';
  position: absolute;
  inset: -4px 0;
}

.btn-add:active { background: var(--accent-hover); }

.sync-ind {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 4px;
  height: 44px;
  padding: 0 8px;
  border: 0;
  border-radius: var(--radius);
  background: none;
  color: var(--text-3);
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
}

.sync-ind:active { background: var(--surface-3); }
.sync-ind .sync-icon,
.chip .auth-icon { display: grid; }
.sync-ind[data-tone='ok'] { color: var(--ok-text); }
.sync-ind[data-tone='busy'] { color: var(--accent-text); }
.sync-ind[data-tone='busy'] .icon { animation: tc-pulse 1.2s ease-in-out infinite; }
.sync-ind[data-tone='warn'] { color: var(--warn-text); }
.sync-ind[data-tone='error'] { color: var(--danger); }
.sync-ind[data-tone='muted'] { color: var(--text-3); }

.auth-chip.is-icon-only {
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  color: var(--text-2);
}

.auth-chip.is-icon-only::after {
  inset: -4px;
}

@media (max-width: 900px) {
  .sync-text,
  .btn-add-label { display: none; }
  .btn-add { width: 40px; padding: 0; justify-content: center; }
  .seg > button { min-width: 40px; padding: 0 10px; }
}

/* iPad portrait: the account chip becomes an icon (its tone still shows 再接続 / ログイン); the holiday
   badge yields to the date (the day page's sticky header shows the holiday name too). */
@media (max-width: 834px) {
  .hdr-holiday { display: none; }
  .auth-text { display: none; }
  .seg > button { min-width: 36px; padding: 0 8px; } /* 日 週 月 年: four buttons, the title keeps its room */
  .auth-chip { justify-content: center; width: 36px; height: 36px; padding: 0; }
  .auth-chip::after { inset: -4px; }
}

@media (max-width: 680px) {
  .hdr-title { font-size: 15px; }
  .btn-today { padding: 0 10px; }
}

/* Split View / Slide Over: the title gets its own row under the controls. */
@media (max-width: 600px) {
  .app-header { flex-wrap: wrap; row-gap: 0; }
  .hdr-nav { order: 1; }
  .hdr-actions { order: 2; margin-left: auto; }
  .hdr-title { order: 3; flex: 1 0 100%; margin: 0 8px 8px; }
}

@media (max-width: 500px) {
  .app-header { gap: 2px; padding-right: max(4px, var(--safe-r)); padding-left: max(4px, var(--safe-l)); }
  .hdr-actions { gap: 0; }
  .hdr-nav .icon-btn { width: 36px; }
  .seg > button { min-width: 36px; padding: 0 8px; }
  .sync-ind { padding: 0 4px; }
}

/* Slide Over (≈ 320–375px): compact everything so the controls still fit one row. */
@media (max-width: 400px) {
  .hdr-nav .icon-btn { width: 30px; }
  .btn-today { margin: 0; padding: 0 8px; }
  .seg { padding: 0 1px; }
  .seg > button { min-width: 30px; padding: 0 6px; }
  .btn-add { width: 34px; }
  .sync-ind { padding: 0 2px; }
  .hdr-settings { width: 34px; }
}

/* ---------------------------------------------------------------- banner (under the header) */

.banner {
  --banner-bg: var(--info-bg);
  --banner-fg: var(--info-text);
  --banner-line: var(--info-line);
  position: relative;
  z-index: 9;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 4px max(6px, var(--safe-r)) 4px max(14px, var(--safe-l));
  border-bottom: 1px solid var(--banner-line);
  background: var(--banner-bg);
  color: var(--banner-fg);
  font-size: 14px;
  line-height: 1.45;
}

.banner:empty {
  display: none;
}

.banner[data-kind='warn'] {
  --banner-bg: var(--warn-bg);
  --banner-fg: var(--warn-fg);
  --banner-line: var(--warn-line);
}

.banner[data-kind='error'] {
  --banner-bg: var(--error-bg);
  --banner-fg: var(--error-fg);
  --banner-line: var(--error-line);
}

.banner-icon {
  display: grid;
  flex: none;
}

.banner-text {
  flex: 1 1 auto;
  min-width: 0;
  padding: 6px 0;
  overflow-wrap: anywhere;
}

.banner .banner-action {
  flex: none;
  border-color: var(--banner-line);
  background: var(--surface-elevated);
  color: var(--banner-fg);
}

.banner .banner-close {
  color: inherit;
}

@media (max-width: 500px) {
  .banner { flex-wrap: wrap; row-gap: 0; padding-bottom: 8px; }
  .banner-text { flex-basis: calc(100% - 80px); }
  .banner .banner-close { order: 3; }
  .banner .banner-action { order: 4; margin-left: auto; }
}

/* ---------------------------------------------------------------- toolbar (floating pill) */

.toolbar {
  position: fixed;
  right: 0;
  bottom: calc(var(--safe-b) + var(--toolbar-gap));
  left: 0;
  z-index: 30;
  /* Centered with auto margins (left:50% + translate would cap the shrink-to-fit width at 50vw). */
  width: max-content;
  max-width: calc(100vw - 24px - var(--safe-l) - var(--safe-r));
  margin: 0 auto;
  border-radius: 24px;
  background: var(--surface-elevated);
  box-shadow: var(--shadow-2), 0 0 0 0.5px var(--line-strong);
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

.toolbar:empty {
  display: none;
}

.tb-full,
.tb-mini {
  display: flex;
  align-items: center;
  gap: 2px;
  height: var(--toolbar-h);
  padding: 6px;
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  border-radius: inherit;
  scrollbar-width: none;
}

.tb-full::-webkit-scrollbar,
.tb-mini::-webkit-scrollbar {
  display: none;
}

.tb-group,
.tb-colors,
.tb-sizes {
  display: flex;
  flex: none;
  align-items: center;
  gap: 2px;
}

.tb-sep {
  flex: none;
  width: 1px;
  height: 28px;
  margin: 0 6px;
  background: var(--line);
}

.tb-tool {
  display: flex;
  flex: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  width: 52px;
  height: 48px;
  padding: 0;
  border: 0;
  border-radius: 14px;
  background: none;
  color: var(--text-2);
  transition: background-color 0.15s, color 0.15s;
}

.tb-label {
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.tb-tool.is-active {
  background: var(--accent);
  color: var(--on-accent);
}

.tb-tool:not(.is-active):active { background: var(--surface-3); }

.tb-swatch,
.tb-size {
  display: grid;
  flex: none;
  place-items: center;
  width: 44px;
  height: 48px;
  padding: 0;
  border: 0;
  border-radius: 12px;
  background: none;
}

.tb-swatch-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--swatch);
  box-shadow: inset 0 0 0 1px var(--swatch-edge);
  transition: box-shadow 0.15s, transform 0.15s;
}

.tb-swatch:active .tb-swatch-dot { transform: scale(0.9); }

.tb-swatch.is-active .tb-swatch-dot {
  box-shadow: 0 0 0 2px var(--surface-elevated), 0 0 0 4px var(--swatch);
}

/* Light marker colors get a darker ring so the active one is visible. */
.tb-swatch.is-marker.is-active .tb-swatch-dot {
  box-shadow: 0 0 0 2px var(--surface-elevated), 0 0 0 4px color-mix(in srgb, var(--swatch) 55%, #374151);
}

.tb-size.is-active { background: var(--accent-soft); }
.tb-size:not(.is-active):active { background: var(--surface-3); }

.tb-size-dot {
  border-radius: 50%;
  background: var(--pen-color, var(--text));
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.25);
}

.tb-size-dot.is-thin { width: 5px; height: 5px; }
.tb-size-dot.is-medium { width: 9px; height: 9px; }
.tb-size-dot.is-thick { width: 14px; height: 14px; }

/* Dark toolbar (#262629): a ring in the swatch's own color vanishes for the default black pen (#1f2937),
   and black size dots disappear. Lighten the ring and edge the dots so every pen color stays visible. */
@media (prefers-color-scheme: dark) {
  .tb-swatch.is-active .tb-swatch-dot {
    box-shadow:
      inset 0 0 0 1px var(--swatch-edge),
      0 0 0 2px var(--surface-elevated),
      0 0 0 4px color-mix(in srgb, var(--swatch) 45%, #ffffff);
  }

  .tb-size-dot { box-shadow: 0 0 0 1.5px var(--text-3); }
}

.tb-btn {
  display: grid;
  flex: none;
  place-items: center;
  width: 44px;
  height: 48px;
  padding: 0;
  border: 0;
  border-radius: 14px;
  background: none;
  color: var(--text-2);
}

.tb-btn:not(:disabled):active { background: var(--surface-3); }

.tb-btn:disabled {
  color: var(--text-4);
  opacity: 0.55;
}

.tb-collapse,
.tb-expand {
  width: 44px;
  color: var(--text-3);
}

.tb-mini-tool {
  position: relative;
  display: grid;
  flex: none;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 0;
  border-radius: 14px;
  background: var(--accent);
  color: var(--on-accent);
}

.tb-mini-icon { display: grid; }

.tb-mini-dot {
  position: absolute;
  right: 6px;
  bottom: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--swatch);
  box-shadow: 0 0 0 2px var(--accent);
}

/* Portrait: the full pen palette must still fit without scrolling, so 元に戻す/やり直す never end up
   scrolled out of view. With 40px swatches it is 784px wide (fits 810–834pt-wide iPads); narrower
   windows (iPad mini portrait: 712px) fall back to 32px. The buttons stay 48px tall. */
@media (max-width: 834px) {
  .tb-tool { width: 46px; }
  .tb-swatch,
  .tb-size { width: 40px; }
  .tb-sep { margin: 0 3px; }
}

@media (max-width: 808px) {
  .tb-swatch,
  .tb-size { width: 32px; }
}

/* ---------------------------------------------------------------- selection menu */

.selection-menu {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 40;
  width: max-content;
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: var(--menu-bg);
  color: #ffffff;
  box-shadow: var(--shadow-2);
  white-space: nowrap;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  -webkit-user-select: none;
  user-select: none;
  animation: tc-pop-in 0.14s var(--ease);
}

.selection-menu:empty {
  display: none;
}

.sm-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 44px;
  padding: 0 14px 0 12px;
  border: 0;
  border-radius: var(--radius-pill);
  background: none;
  color: inherit;
  font-size: 14px;
  font-weight: 600;
}

.sm-btn:active { background: rgba(255, 255, 255, 0.16); }

.sm-btn.sm-primary {
  background: var(--accent);
  color: #ffffff;
}

.sm-btn.sm-primary:active { background: var(--accent-hover); }

.sm-btn:focus-visible {
  outline-color: #ffffff;
  outline-offset: -2px;
}

/* ---------------------------------------------------------------- dialogs (modal sheets) */

.dialog-backdrop {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding:
    calc(var(--safe-t) + var(--vv-top, 0px) + 16px)
    calc(var(--safe-r) + 16px)
    calc(var(--safe-b) + var(--vv-bottom, 0px) + 16px)
    calc(var(--safe-l) + 16px);
  background: var(--backdrop);
  overscroll-behavior: contain;
  animation: tc-fade-in 0.18s ease-out;
}

.dialog {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 560px;
  max-height: 100%;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--surface-elevated);
  color: var(--text);
  box-shadow: var(--shadow-3);
  animation: tc-sheet-in 0.24s var(--ease);
}

.dialog:focus {
  outline: none;
}

.dialog-header {
  display: flex;
  flex: none;
  align-items: center;
  gap: 12px;
  min-height: 56px;
  padding: 10px 16px 6px 20px;
}

.dialog-title {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 18px;
  font-weight: 700;
}

.dialog-body {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 16px;
  min-height: 0;
  padding: 6px 20px 20px;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

/* The body scrolls; its children keep their size (overflow:hidden items would otherwise shrink to 0). */
.dialog-body > * {
  flex-shrink: 0;
}

.dialog-footer {
  position: sticky;
  bottom: 0;
  flex: none;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: var(--surface-elevated);
}

.dialog-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dialog-actions-spacer {
  flex: 1 1 auto;
}

.dialog-actions .btn-primary {
  min-width: 96px;
}

.dialog-error {
  margin-bottom: 10px;
  color: var(--danger);
  font-size: 14px;
  font-weight: 600;
}

/* Narrow windows (Split View, Slide Over): a bottom sheet. */
@media (max-width: 600px) {
  .dialog-backdrop {
    align-items: flex-end;
    padding: calc(var(--safe-t) + var(--vv-top, 0px) + 12px) 0 var(--vv-bottom, 0px) 0;
  }

  .dialog {
    max-width: none;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    animation-name: tc-sheet-up;
  }

  .dialog-body { padding-right: 16px; padding-left: 16px; }
  .dialog-footer { padding-bottom: calc(12px + var(--safe-b)); }
}

@media (max-width: 420px) {
  .field-grid--timed { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .field-grid--timed .field-date,
  .field-grid--timed .field-end-date { grid-column: 1 / -1; }
}

/* Event dialog */
.snapshot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 12px;
  border-radius: var(--radius);
  background: var(--group-bg);
}

.snapshot img {
  display: block;
  max-width: 100%;
  max-height: 200px;
  border-radius: var(--radius-sm);
  background: #ffffff;
  box-shadow: 0 0 0 1px var(--line);
  object-fit: contain;
  -webkit-user-drag: none;
}

.snapshot figcaption {
  color: var(--text-3);
  font-size: 12.5px;
  font-weight: 600;
}

.field-title .hint {
  margin-top: 2px;
}

.link-external {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  gap: 6px;
  min-height: 44px;
  color: var(--accent-text);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

.link-external:active { opacity: 0.7; }

/* Settings */
.dialog--settings .dialog-body {
  gap: 22px;
  padding-top: 4px;
}

.settings-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.settings-heading {
  margin-left: 4px;
  color: var(--text-3);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.settings-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  padding: 8px 14px;
}

.settings-calendar {
  cursor: pointer;
}

.settings-row-text {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.settings-row-label {
  font-size: 16px;
  overflow-wrap: anywhere;
}

.settings-row-hint {
  color: var(--text-3);
  font-size: 12.5px;
  overflow-wrap: anywhere;
}

.settings-account-icon {
  display: grid;
  flex: none;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-text);
}

.settings-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.settings-empty {
  padding: 14px;
  border-radius: var(--radius);
  background: var(--group-bg);
  color: var(--text-3);
  font-size: 14px;
}

.settings-about {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  border-radius: var(--radius);
  background: var(--group-bg);
  color: var(--text-2);
  font-size: 13.5px;
  line-height: 1.65;
}

.settings-note {
  margin: 8px 4px 0;
  color: var(--text-2);
  font-size: 13.5px;
  line-height: 1.6;
}

.settings-version {
  margin-left: 4px;
  color: var(--text-3);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
}

/* ---------------------------------------------------------------- toasts */

.toast-host {
  position: fixed;
  bottom: calc(var(--safe-b) + var(--toolbar-space));
  left: 50%;
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: max-content;
  max-width: calc(100vw - 32px);
  transform: translateX(-50%);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  min-height: 48px;
  padding: 8px 8px 8px 18px;
  border-radius: 14px;
  background: var(--toast-bg);
  color: var(--toast-text);
  box-shadow: var(--shadow-2);
  font-size: 15px;
  line-height: 1.4;
  pointer-events: auto;
  animation: tc-toast-in 0.22s var(--ease);
}

.toast[data-kind='error'] {
  background: var(--toast-error-bg);
}

.toast-text {
  min-width: 0;
  padding: 4px 10px 4px 0;
  overflow-wrap: anywhere;
}

.toast-action {
  position: relative;
  flex: none;
  min-height: 36px;
  padding: 0 10px;
  border: 0;
  border-radius: var(--radius-sm);
  background: none;
  color: var(--toast-action);
  font-size: 15px;
  font-weight: 700;
}

.toast-action:active { background: rgba(255, 255, 255, 0.12); }

.toast-close {
  position: relative;
  display: grid;
  flex: none;
  place-items: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: none;
  color: inherit;
  opacity: 0.8;
}

/* 36px visual, ≥ 44px hit area (inside the toast's 8px padding). */
.toast-action::after,
.toast-close::after {
  content: '';
  position: absolute;
  inset: -4px;
}

.toast.is-leaving {
  animation: tc-toast-out 0.2s ease-in forwards;
}

/* ---------------------------------------------------------------- welcome (main.js renders .welcome into #dialog-root) */

#dialog-root:has(> .welcome) {
  display: grid;
  place-items: center;
  padding: calc(var(--safe-t) + 24px) calc(var(--safe-r) + 20px) calc(var(--safe-b) + 24px) calc(var(--safe-l) + 20px);
  overflow-y: auto;
  background:
    radial-gradient(120% 80% at 50% 0%, rgba(37, 99, 235, 0.08), transparent 60%),
    var(--app-bg);
  pointer-events: auto;
}

.welcome {
  display: flex;
  flex-direction: column;
  gap: 14px;
  width: min(100%, 480px);
  padding: 32px 28px 28px;
  border-radius: 24px;
  background: var(--surface-elevated);
  color: var(--text);
  box-shadow: var(--shadow-2), 0 0 0 0.5px var(--line);
  animation: tc-sheet-in 0.3s var(--ease);
}

.welcome h1 {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.welcome p {
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.7;
}

.welcome ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 2px 0 8px;
  padding: 0;
  list-style: none;
}

.welcome li {
  position: relative;
  padding-left: 26px;
  font-size: 15px;
  line-height: 1.6;
}

.welcome li::before {
  content: '';
  position: absolute;
  top: 0.5em;
  left: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  box-shadow: inset 0 0 0 3px var(--accent);
}

.welcome .btn {
  width: 100%;
  min-height: 52px;
  font-size: 17px;
}

.welcome-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.welcome .note,
.welcome .hint,
.welcome small {
  color: var(--text-3);
  font-size: 13px;
  line-height: 1.6;
}

.welcome .note {
  background: var(--group-bg);
}

.welcome img {
  width: 64px;
  height: 64px;
  border-radius: 14px;
}

/* ---------------------------------------------------------------- animations */

@keyframes tc-fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes tc-sheet-in {
  from { opacity: 0; transform: translateY(12px) scale(0.985); }
  to { opacity: 1; transform: none; }
}

@keyframes tc-sheet-up {
  from { transform: translateY(100%); }
  to { transform: none; }
}

@keyframes tc-pop-in {
  from { opacity: 0; transform: scale(0.94); }
  to { opacity: 1; transform: none; }
}

@keyframes tc-toast-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

@keyframes tc-toast-out {
  to { opacity: 0; transform: translateY(6px); }
}

@keyframes tc-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(7px); }
  60% { transform: translateX(-5px); }
  80% { transform: translateX(3px); }
}

@keyframes tc-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

@media (prefers-reduced-motion: reduce) {
  .dialog-backdrop,
  .dialog,
  .welcome,
  .toast,
  .toast.is-leaving,
  .selection-menu,
  .is-shaking,
  .sync-ind .icon {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .switch-track,
  .switch-track::after,
  .tb-tool,
  .seg > button::before {
    transition: none;
  }
}