:root {
  --black: #000000;
  --near-black: #000000;
  --dark-gray: #111111;
  --mid-gray: #8a8a8a;
  --light-gray: #e6e6e6;
  --white: #ffffff;
  --font-mincho: "Hiragino Mincho ProN", "Yu Mincho", YuMincho, "Noto Serif CJK JP", serif;
}

* { box-sizing: border-box; }
html { background: var(--black); color-scheme: dark; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--black);
  color: var(--white);
  font-family: var(--font-mincho);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea, select { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--white);
  outline-offset: 3px;
}

.app-shell { width: min(100%, 980px); min-height: 100vh; margin: 0 auto; }
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  min-height: 76px;
  padding: max(10px, env(safe-area-inset-top)) 12px 10px;
  background: var(--black);
  border-bottom: 2px solid var(--white);
}
.title-button {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
  padding: 0 8px;
  border: 0;
  background: var(--black);
  color: var(--white);
  text-align: left;
}
.title-button:hover .app-title { text-decoration: underline; text-underline-offset: 5px; }
.eyebrow { color: var(--light-gray); font-size: .7rem; letter-spacing: .16em; }
.app-title { font-size: 1.5rem; font-weight: 700; letter-spacing: .05em; }
.square-button {
  width: 48px;
  min-width: 48px;
  height: 48px;
  padding: 0;
  border: 2px solid var(--white);
  border-radius: 0;
  background: var(--black);
  color: var(--white);
  font-size: 1.4rem;
  font-weight: 700;
}
.square-button:hover { background: var(--white); color: var(--black); }
.header-add { align-self: center; }

.main-content { padding: 18px 14px calc(92px + env(safe-area-inset-bottom)); }
.view { display: none; }
.view.active { display: block; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 18px; font-size: 1.4rem; }
h2 { margin-bottom: 10px; font-size: 1.05rem; }
p { margin-bottom: 14px; }

.section-heading, .dialog-heading, .session-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.section-heading h1, .section-heading h2, .dialog-heading h1 { margin: 0; }

.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.stat-box {
  min-height: 110px;
  padding: 14px 12px;
  border: 2px solid var(--white);
  background: var(--black);
}
.stat-box span { display: block; color: var(--light-gray); font-size: .78rem; }
.stat-box strong { display: block; margin-top: 6px; font-size: 2rem; line-height: 1.2; }

.home-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 14px 0 18px; }
.panel, .card-item, .review-card {
  border: 2px solid var(--white);
  border-radius: 0;
  background: var(--black);
}
.panel { margin: 14px 0; padding: 16px; }

.button, .file-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 14px;
  border: 2px solid var(--white);
  border-radius: 0;
  background: var(--black);
  color: var(--white);
  text-align: center;
  font-weight: 700;
}
.button:hover, .file-button:hover { background: var(--white); color: var(--black); }
.button.primary { background: var(--white); color: var(--black); }
.button.primary:hover { background: var(--black); color: var(--white); }
.button.small { min-height: 40px; padding: 6px 14px; }
.button.secondary-evaluation { border-width: 3px; background: var(--black); }
.file-button { position: relative; }
.file-button input { position: absolute; width: 1px; height: 1px; opacity: 0; }

.filters { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 10px; }
.form-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.form-grid.two-column { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.filters.two { grid-template-columns: 2fr 1fr; }
.filters.three { grid-template-columns: 2fr 1fr 1fr; }
label > span { display: block; margin-bottom: 5px; color: var(--light-gray); font-size: .84rem; }
input, textarea, select {
  width: 100%;
  border: 2px solid var(--white);
  border-radius: 0;
  background: var(--black);
  color: var(--white);
  padding: 11px 12px;
}
textarea { min-height: 130px; resize: vertical; line-height: 1.8; }
select { appearance: auto; }
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 52px;
  margin-bottom: 0;
  padding: 10px 12px;
  border: 2px solid var(--white);
}
.checkbox-row input { width: 24px; height: 24px; margin: 0; accent-color: var(--white); }
.checkbox-row span { margin: 0; color: var(--white); font-weight: 700; }

.list-summary, .explanation, .progress-text { color: var(--light-gray); font-size: .84rem; }
.card-list { display: grid; gap: 10px; }
.card-item { padding: 14px; }
.card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; }
.card-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.label-box {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 2px 8px;
  border: 1px solid var(--white);
  border-radius: 0;
  background: var(--black);
  color: var(--white);
  font-size: .75rem;
}
.due-label, .inverse-label { border-width: 2px; background: var(--white); color: var(--black); font-weight: 700; }
.card-question { margin: 14px 0 8px; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 1.02rem; }
.card-answer-preview { margin: 0; color: var(--light-gray); white-space: pre-wrap; overflow-wrap: anywhere; }
.card-actions { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-top: 14px; }
.card-actions .button { min-height: 40px; padding: 6px 10px; }

.compact-list { padding: 0; }
.compact-item { padding: 11px 0; border-bottom: 1px solid var(--mid-gray); }
.compact-item:last-child { border-bottom: 0; }
.compact-item strong { display: block; white-space: pre-wrap; overflow-wrap: anywhere; }
.compact-item span { color: var(--light-gray); font-size: .8rem; }
.empty-state { padding: 26px 12px; color: var(--light-gray); text-align: center; }

.review-card { min-height: 390px; padding: 18px; }
.review-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.flash-side { margin-top: 22px; }
.flash-side h2 { padding-bottom: 7px; border-bottom: 2px solid var(--white); font-size: .9rem; letter-spacing: .1em; }
.flash-text { min-height: 110px; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 1.12rem; line-height: 1.9; }
.answer-side { margin-top: 26px; padding-top: 20px; border-top: 3px double var(--white); }
.reveal-hint { margin-top: 46px; color: var(--light-gray); text-align: center; }
.review-flag-button { width: 100%; margin-top: 10px; }
.review-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 8px; }
.large-count { font-size: 1.3rem; }
.centered { text-align: center; }
.stacked-actions { display: grid; gap: 8px; }
.empty-review { text-align: center; }

.bottom-nav {
  position: fixed;
  z-index: 30;
  inset: auto 0 0;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  width: min(100%, 980px);
  margin: 0 auto;
  padding: 0 0 env(safe-area-inset-bottom);
  border-top: 2px solid var(--white);
  background: var(--black);
}
.nav-button {
  min-height: 58px;
  padding: 5px 2px;
  border: 0;
  border-right: 1px solid var(--mid-gray);
  border-radius: 0;
  background: var(--black);
  color: var(--light-gray);
  font-family: var(--font-mincho);
  font-size: .78rem;
}
.nav-button:last-child { border-right: 0; }
.nav-button.active { background: var(--white); color: var(--black); font-weight: 700; }

.editor-dialog {
  width: min(760px, calc(100% - 20px));
  max-height: calc(100vh - 20px);
  padding: 0;
  border: 3px solid var(--white);
  border-radius: 0;
  background: var(--black);
  color: var(--white);
}
.editor-dialog::backdrop { background: rgba(0, 0, 0, .92); }
.editor-dialog form { padding: 18px; }
.editor-dialog label { display: block; margin-bottom: 14px; }
.editor-dialog label.checkbox-row { display: flex; margin-bottom: 0; }
.dialog-actions {
  position: sticky;
  bottom: -18px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px 0 18px;
  background: var(--black);
  border-top: 2px solid var(--white);
}

.toast {
  position: fixed;
  z-index: 100;
  left: 50%;
  bottom: calc(78px + env(safe-area-inset-bottom));
  translate: -50% 18px;
  max-width: calc(100% - 24px);
  padding: 10px 14px;
  border: 2px solid var(--black);
  border-radius: 0;
  background: var(--white);
  color: var(--black);
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transition: opacity 140ms ease, translate 140ms ease;
}
.toast.show { opacity: 1; translate: -50% 0; }
.warning-text { color: var(--white); font-weight: 700; text-decoration: underline; text-underline-offset: 4px; }
.info-list { margin: 0; }
.info-list div { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--mid-gray); }
.info-list div:last-child { border-bottom: 0; }
.info-list dt { color: var(--light-gray); }
.info-list dd { margin: 0; text-align: right; }
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (max-width: 680px) {
  .filters, .filters.two, .filters.three, .form-grid, .form-grid.two-column, .home-actions, .checkbox-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-box { min-height: 96px; padding: 10px 8px; }
  .stat-box span { font-size: .66rem; }
  .stat-box strong { font-size: 1.55rem; }
  .main-content { padding-inline: 10px; }
  .app-header { padding-inline: 8px; }
  .app-title { font-size: 1.3rem; }
  .editor-dialog { width: 100%; height: 100vh; max-height: 100vh; border-inline: 0; border-block: 0; }
  .nav-button { font-size: .68rem; }
}

@media (min-width: 900px) {
  .main-content { padding-inline: 26px; }
  .card-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .home-actions { max-width: 720px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; }
}

.backup-fallback { margin-top: 16px; border: 2px solid #fff; padding: 14px; background: #000; }
.backup-fallback h3 { margin: 0 0 8px; }
.backup-fallback textarea { width: 100%; margin-top: 12px; min-height: 180px; resize: vertical; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 12px; }

button:disabled {
  cursor: not-allowed;
  opacity: .42;
}

.active-timer-bar {
  position: sticky;
  top: 76px;
  z-index: 19;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: stretch;
  gap: 8px;
  padding: 8px 12px;
  border-bottom: 3px solid var(--white);
  background: var(--white);
  color: var(--black);
}
.timer-summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 5px 8px;
  border: 2px solid var(--black);
  border-radius: 0;
  background: var(--white);
  color: var(--black);
  text-align: left;
}
.timer-summary strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.timer-status { font-size: .75rem; font-weight: 700; }
.timer-elapsed { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 1.05rem; font-weight: 700; }
.timer-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.timer-actions .button { min-width: 94px; border-color: var(--black); }
.timer-actions .button:not(.primary) { background: var(--white); color: var(--black); }
.timer-actions .button.primary { background: var(--black); color: var(--white); }

.home-stats { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.home-stats .stat-box strong { font-size: 1.65rem; overflow-wrap: anywhere; }

.management-tabs {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-bottom: 16px;
  border: 2px solid var(--white);
}
.management-tab {
  min-height: 48px;
  border: 0;
  border-right: 1px solid var(--white);
  border-radius: 0;
  background: var(--black);
  color: var(--white);
  font-weight: 700;
}
.management-tab:last-child { border-right: 0; }
.management-tab.active { background: var(--white); color: var(--black); }
.management-panel { min-height: 300px; }
.date-toolbar {
  display: grid;
  grid-template-columns: auto minmax(180px, 1fr) auto auto;
  align-items: end;
  gap: 8px;
  margin-bottom: 14px;
}
.date-toolbar.week-toolbar {
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  border: 2px solid var(--white);
  padding: 8px;
}
.date-toolbar.week-toolbar strong { text-align: center; }
.date-label { margin: 0; }
.small-square { width: 44px; min-width: 44px; height: 44px; }
.management-stats { margin-bottom: 16px; }
.management-list-heading { margin-top: 20px; }

.plan-list, .log-list, .week-list { display: grid; gap: 10px; }
.plan-item, .log-item, .week-day {
  border: 2px solid var(--white);
  background: var(--black);
}
.plan-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 14px;
}
.plan-item.completed .plan-main { opacity: .68; }
.plan-item.completed h3 { text-decoration: line-through; text-decoration-thickness: 2px; }
.plan-main h3, .log-main h3 { margin: 10px 0 6px; font-size: 1.02rem; }
.plan-detail, .plan-note, .log-main p { margin: 4px 0; color: var(--light-gray); overflow-wrap: anywhere; }
.plan-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(100px, 1fr));
  gap: 6px;
  align-content: start;
  min-width: 220px;
}
.plan-actions .button { min-height: 38px; padding: 5px 8px; }
.week-day { padding: 12px; }
.week-day-heading {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--white);
}
.week-day-heading h2 { margin: 0; }
.week-day-heading span { color: var(--light-gray); }
.week-day .plan-item { margin-top: 8px; grid-template-columns: 1fr; border-width: 1px; }
.empty-inline { margin: 10px 0 0; color: var(--mid-gray); }

.log-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  padding: 14px;
}
.log-item > .button { align-self: start; }

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.summary-grid .panel { margin: 0; }
.summary-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--mid-gray);
}
.summary-row:last-child { border-bottom: 0; }
.summary-row strong { text-align: right; }

.compact-dialog { width: min(680px, calc(100% - 20px)); }
.three-actions { grid-template-columns: repeat(3, minmax(0, 1fr)); }

@media (max-width: 680px) {
  .active-timer-bar { top: 72px; grid-template-columns: 1fr; }
  .timer-summary { grid-template-columns: auto 1fr; }
  .timer-elapsed { grid-column: 1 / -1; font-size: 1.25rem; }
  .timer-actions .button { min-width: 0; }
  .home-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .management-tabs { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .management-tab { padding: 4px; font-size: .76rem; }
  .date-toolbar, .date-toolbar.week-toolbar { grid-template-columns: auto 1fr auto; }
  .date-toolbar #managementTodayButton, .date-toolbar #managementCurrentWeek, .date-toolbar #managementCurrentMonth, .date-toolbar #summaryCurrentWeek, .date-toolbar #summaryCurrentMonth { grid-column: 1 / -1; }
  .plan-item, .log-item { grid-template-columns: 1fr; }
  .plan-actions { min-width: 0; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .summary-grid { grid-template-columns: 1fr; }
  .three-actions { grid-template-columns: 1fr; }
  .bottom-nav { grid-template-columns: repeat(7, minmax(0, 1fr)); }
  .nav-button { font-size: .58rem; }
}


.filters.five { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.summary-section { margin-bottom: 20px; }
.cumulative-section { border-width: 2px; }
.summary-grid.three-summary { grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px) {
  .filters.five, .summary-grid.three-summary { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .filters.five, .summary-grid.three-summary { grid-template-columns: 1fr; }
}

/* v4.0.0: 法律学習庫 */
.note-list, .month-list { display: grid; gap: 10px; }
.note-item {
  border: 2px solid var(--white);
  background: var(--black);
  padding: 14px;
}
.note-item h2 { margin: 10px 0 8px; font-size: 1.08rem; }
.note-body-preview { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.7; color: var(--light-gray); }
.list-more { width: 100%; margin-top: 12px; }
.compact-plan-actions { grid-template-columns: repeat(2, minmax(84px, 1fr)); min-width: 190px; }
.diagnostics-result { margin-top: 14px; border: 2px solid var(--white); padding: 12px; }
.diagnostics-result h3 { margin: 16px 0 8px; }
.diagnostics-result ul { margin: 0; padding-left: 1.4rem; }
.diagnostics-result li { margin: 6px 0; }

@media (min-width: 681px) {
  .management-tabs { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .bottom-nav { grid-template-columns: repeat(7, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .management-tabs { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .management-tab { font-size: .68rem; }
  .bottom-nav { grid-template-columns: repeat(7, minmax(0, 1fr)); }
  .nav-button { font-size: .52rem; padding-inline: 2px; }
  .compact-plan-actions { min-width: 0; }
}