:root {
  --color-paper: #f3f0e8;
  --color-surface: #fffdf9;
  --color-ink: #232a2f;
  --color-muted: #6a7076;
  --color-line: #d8d2c4;
  --color-line-strong: #b9b2a2;
  --color-accent: #2d6a57;
  --color-accent-deep: #22523f;
  --color-accent-soft: #e3efe9;
  --color-danger: #a33d2f;
  --color-danger-soft: #f6e6e2;
  --color-shadow: rgba(35, 42, 47, 0.08);
  --radius: 10px;
  --radius-small: 6px;
  --font-body: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --tap: 44px;
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100dvh;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

[hidden] {
  display: none !important;
}

.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-line);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 16px;
  padding-top: calc(12px + env(safe-area-inset-top));
}

.header__title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap);
  height: var(--tap);
  margin: -8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
}

.icon-button:hover,
.icon-button:focus-visible {
  background: var(--color-accent-soft);
  color: var(--color-accent-deep);
  outline: none;
}

.icon-button__icon {
  width: 22px;
  height: 22px;
}

.main {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 48px;
  padding-bottom: calc(48px + env(safe-area-inset-bottom));
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px var(--color-shadow);
  padding: 20px;
}

.panel + .panel {
  margin-top: 20px;
}

.field {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.field + .field {
  margin-top: 22px;
}

.field__label {
  display: block;
  margin-bottom: 8px;
  padding: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.field__input {
  width: 100%;
  min-height: var(--tap);
  padding: 8px 12px;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-small);
  background: #fff;
  color: var(--color-ink);
}

.field__input:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
  border-color: var(--color-accent);
}

.field__input--minutes {
  width: 96px;
  text-align: right;
}

.field__custom {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 14px;
}

.field__custom-label {
  white-space: nowrap;
}

.field__unit {
  white-space: nowrap;
}

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

.chip {
  min-height: var(--tap);
  padding: 8px 16px;
  border: 1px solid var(--color-line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--color-ink);
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}

.chip:hover {
  border-color: var(--color-accent);
}

.chip:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.chip.is-selected {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

.range {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.range__item {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.range__label {
  font-size: 12px;
  color: var(--color-muted);
}

.range__dash {
  padding-bottom: 10px;
  color: var(--color-muted);
}

.form__error {
  margin: 16px 0 0;
  padding: 10px 12px;
  border-radius: var(--radius-small);
  background: var(--color-danger-soft);
  color: var(--color-danger);
  font-size: 14px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap);
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.15s, border-color 0.15s;
}

.button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.button:disabled {
  opacity: 0.55;
  cursor: progress;
}

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

.button--primary:hover:not(:disabled) {
  background: var(--color-accent-deep);
}

.button--ghost {
  background: #fff;
  border-color: var(--color-line-strong);
  color: var(--color-accent-deep);
}

.button--ghost:hover:not(:disabled) {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
}

.button--block {
  width: 100%;
  margin-top: 22px;
}

.button__icon {
  width: 18px;
  height: 18px;
}

.result__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.result__summary {
  margin: 0;
  font-size: 14px;
  color: var(--color-muted);
}

.result__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-line);
}

.result__item {
  border-bottom: 1px solid var(--color-line);
}

.result__line {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: var(--tap);
  padding: 10px 8px;
  border: 0;
  background: transparent;
  color: var(--color-ink);
  text-align: left;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  line-height: 1.7;
  transition: background-color 0.15s;
}

.result__line:hover {
  background: var(--color-accent-soft);
}

.result__line:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.result__line.is-copied {
  background: var(--color-accent-soft);
}

.result__text {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
}

.result__mark {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  color: var(--color-accent);
  opacity: 0;
  transition: opacity 0.15s;
}

.result__line.is-copied .result__mark {
  opacity: 1;
}

.result__note {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-radius: var(--radius-small);
  background: var(--color-danger-soft);
  color: var(--color-danger);
  font-size: 14px;
}

.result__hint {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--color-muted);
}

.notice {
  margin: 20px 0 0;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: 15px;
  white-space: pre-line;
}

.notice.is-error {
  border-color: #e3c1ba;
  background: var(--color-danger-soft);
  color: var(--color-danger);
}

.settings,
.help {
  width: min(560px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  margin: auto;
  padding: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  background: var(--color-surface);
  color: var(--color-ink);
  box-shadow: 0 12px 40px rgba(35, 42, 47, 0.18);
  overflow-y: auto;
}

.settings::backdrop,
.help::backdrop {
  background: rgba(35, 42, 47, 0.35);
}

.settings__form,
.help__form {
  padding: 20px;
}

.settings__head,
.help__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.settings__title,
.help__title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.help__section {
  padding: 16px 0;
  border-top: 1px solid var(--color-line);
}

.help__label {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.help__steps,
.help__list,
.help__legend {
  list-style: none;
  margin: 0;
  padding: 0;
}

.help__step,
.help__item,
.help__legend-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
}

.help__step + .help__step,
.help__item + .help__item,
.help__legend-item + .help__legend-item {
  margin-top: 8px;
}

.help__num,
.help-figure__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}

.help__num {
  margin-top: 1px;
}

.help__text {
  flex: 1 1 auto;
  min-width: 0;
}

.help__term {
  flex: 0 0 8em;
  font-weight: 600;
}

.help__note {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--color-muted);
}

.help__swatch {
  flex: 0 0 auto;
  width: 22px;
  height: 14px;
  margin-top: 4px;
  border-radius: 3px;
}

.help__swatch--busy {
  background: var(--color-ink);
}

.help__swatch--buffer {
  background: repeating-linear-gradient(45deg, var(--color-line-strong) 0 2px, transparent 2px 5px);
  border: 1px solid var(--color-line-strong);
}

.help__swatch--free {
  background: var(--color-accent);
}

.help__swatch--short {
  border: 1px dashed var(--color-line-strong);
  background: transparent;
}

/* 画面の縮小再現（手順の図解） */
.help-figure {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.help-figure__panel {
  padding: 10px 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-paper);
}

.help-figure__block {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.help-figure__block + .help-figure__block {
  margin-top: 10px;
}

.help-figure__body {
  flex: 1 1 auto;
  min-width: 0;
}

.help-figure__label {
  display: block;
  margin-bottom: 4px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-muted);
}

.help-figure__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.help-figure__chip {
  padding: 2px 8px;
  border: 1px solid var(--color-line-strong);
  border-radius: 999px;
  background: #fff;
  font-size: 11px;
  line-height: 1.5;
}

.help-figure__chip.is-selected {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

.help-figure__dates {
  display: flex;
  align-items: center;
  gap: 6px;
}

.help-figure__date {
  flex: 1 1 0;
  padding: 3px 8px;
  border: 1px solid var(--color-line-strong);
  border-radius: 4px;
  background: #fff;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.help-figure__dash {
  font-size: 11px;
  color: var(--color-muted);
}

.help-figure__button {
  display: block;
  padding: 5px 0;
  border-radius: 4px;
  background: var(--color-accent);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  text-align: center;
}

.help-figure__resulthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 6px;
}

.help-figure__summary {
  font-size: 11px;
  color: var(--color-muted);
}

.help-figure__copyall {
  padding: 2px 8px;
  border: 1px solid var(--color-line-strong);
  border-radius: 4px;
  background: #fff;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-accent-deep);
}

.help-figure__rows {
  border-top: 1px solid var(--color-line);
}

.help-figure__row {
  display: block;
  padding: 4px 6px;
  border-bottom: 1px solid var(--color-line);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.help-figure__row.is-copied {
  background: var(--color-accent-soft);
}

/* 計算の仕組みの図 */
.help-timeline {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 12px;
  font-size: 9px;
  font-variant-numeric: tabular-nums;
}

.help-timeline__grid line {
  stroke: var(--color-line);
  stroke-width: 1;
}

.help-timeline__hours text {
  fill: var(--color-muted);
  text-anchor: middle;
}

.help-timeline__hatch {
  stroke: var(--color-line-strong);
  stroke-width: 1.5;
}

.help-timeline__buffer rect {
  fill: url(#help-hatch);
  stroke: var(--color-line-strong);
  stroke-width: 0.8;
}

.help-timeline__busy rect {
  fill: var(--color-ink);
}

.help-timeline__busy text,
.help-timeline__free text {
  fill: #fff;
  font-weight: 600;
  text-anchor: middle;
  dominant-baseline: middle;
}

.help-timeline__free rect {
  fill: var(--color-accent);
}

.help-timeline__short rect {
  fill: none;
  stroke: var(--color-line-strong);
  stroke-dasharray: 3 2;
}

.help-timeline__short text {
  fill: var(--color-muted);
  text-anchor: middle;
  dominant-baseline: middle;
}

.help-timeline__caption text {
  fill: var(--color-ink);
  text-anchor: middle;
}

.settings__group {
  margin: 0;
  padding: 16px 0;
  border: 0;
  border-top: 1px solid var(--color-line);
  min-width: 0;
}

.settings__label {
  display: block;
  margin-bottom: 10px;
  padding: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-muted);
}

.settings__note {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--color-muted);
}

.segment {
  display: inline-flex;
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-small);
  overflow: hidden;
}

.segment__item {
  position: relative;
}

.segment__input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}

.segment__text {
  display: inline-flex;
  align-items: center;
  min-height: var(--tap);
  padding: 8px 18px;
  background: #fff;
  font-variant-numeric: tabular-nums;
}

.segment__item + .segment__item .segment__text {
  border-left: 1px solid var(--color-line-strong);
}

.segment__input:checked + .segment__text {
  background: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

.segment__input:focus-visible + .segment__text {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

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

.weekday {
  position: relative;
}

.weekday__input {
  position: absolute;
  inset: 0;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}

.weekday__text {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--tap);
  height: var(--tap);
  border: 1px solid var(--color-line-strong);
  border-radius: 50%;
  background: #fff;
}

.weekday__input:checked + .weekday__text {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: #fff;
  text-decoration: line-through;
}

.weekday__input:focus-visible + .weekday__text {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.checklist__item {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: var(--tap);
  padding: 4px 0;
  cursor: pointer;
}

.checklist__input {
  width: 20px;
  height: 20px;
  margin: 0;
  accent-color: var(--color-accent);
}

.checklist__text {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
}

.checklist__badge {
  flex: 0 0 auto;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--color-accent-soft);
  color: var(--color-accent-deep);
  font-size: 12px;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(24px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: calc(100vw - 32px);
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--color-ink);
  color: #fff;
  font-size: 14px;
  box-shadow: 0 6px 20px rgba(35, 42, 47, 0.25);
  z-index: 10;
}

.toast.is-error {
  background: var(--color-danger);
}

.toast__icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

@media (max-width: 767px) {
  .panel {
    padding: 16px;
  }

  .result__head {
    flex-direction: column;
    align-items: stretch;
  }

  .result__head .button {
    width: 100%;
  }

  .range__item .field__input {
    padding-left: 8px;
    padding-right: 8px;
  }

  .settings,
  .help {
    width: calc(100vw - 16px);
    max-height: calc(100dvh - 16px);
  }

  .settings__form,
  .help__form {
    padding: 16px;
  }

  .help__term {
    flex-basis: 100%;
  }

  .help__item {
    flex-wrap: wrap;
    gap: 2px 10px;
  }
}