:root {
  --mint-50: #f3fbf7;
  --mint-100: #e4f5ec;
  --mint-200: #c9ead9;
  --mint-500: #4aa77c;
  --mint-700: #2d7257;
  --mint-900: #194838;
  --cream: #fffaf0;
  --yellow: #f7cf5e;
  --yellow-soft: #fff4bf;
  --orange: #e98b42;
  --orange-soft: #fff0e1;
  --ink: #24352e;
  --muted: #64736c;
  --line: #d9e5df;
  --white: #ffffff;
  --danger: #b54b48;
  --shadow: 0 18px 50px rgba(40, 82, 63, 0.1);
  --school-font:
    "UD Digi Kyokasho N-R", "Yu Kyokasho", "Hiragino Mincho ProN", "Yu Mincho",
    serif;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(
      circle at 12% 8%,
      rgba(247, 207, 94, 0.16),
      transparent 24rem
    ),
    radial-gradient(
      circle at 92% 24%,
      rgba(74, 167, 124, 0.12),
      transparent 28rem
    ),
    var(--mint-50);
  font-family:
    -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic",
    "Meiryo", sans-serif;
  line-height: 1.65;
}

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

button,
a,
select,
input[type="radio"] {
  -webkit-tap-highlight-color: transparent;
}

button {
  border: 0;
  cursor: pointer;
}

button:disabled,
input:disabled {
  cursor: not-allowed;
}

a {
  color: inherit;
}

[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;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--white);
  background: var(--mint-900);
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
}

.brand img {
  flex: 0 0 auto;
}

.brand-copy {
  display: grid;
  line-height: 1.25;
}

.brand-copy strong {
  color: var(--mint-900);
  font-size: 1.16rem;
  letter-spacing: 0.03em;
}

.brand-copy small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.75rem;
}

.parent-menu-link,
.text-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 9px 15px;
  color: var(--mint-700);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 11px;
  font-size: 0.88rem;
  font-weight: 800;
  text-decoration: none;
  transition:
    border-color 0.18s ease,
    background 0.18s ease,
    transform 0.18s ease;
}

.parent-menu-link:hover,
.text-button:hover {
  background: var(--mint-100);
  border-color: var(--mint-500);
  transform: translateY(-1px);
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  align-items: center;
  gap: 30px;
  padding: 54px 58px;
  overflow: hidden;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.96),
    rgba(238, 249, 243, 0.98)
  );
  border: 1px solid var(--mint-200);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--mint-700);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.11em;
}

.home-hero h1,
.manage-hero h1 {
  margin: 0;
  color: var(--mint-900);
  font-size: clamp(2.5rem, 6vw, 4.7rem);
  line-height: 1.08;
  letter-spacing: 0.04em;
}

.home-hero > div > p:last-child {
  max-width: 34rem;
  margin: 18px 0 0;
  color: #506159;
  font-size: clamp(1rem, 2vw, 1.18rem);
  font-weight: 700;
}

.hero-flask {
  position: relative;
  display: grid;
  width: 190px;
  height: 190px;
  place-items: center;
  justify-self: end;
  background: var(--yellow-soft);
  border: 2px solid #f0d26f;
  border-radius: 50%;
  transform: rotate(2deg);
}

.hero-flask::before {
  position: absolute;
  width: 72px;
  height: 94px;
  content: "";
  background: linear-gradient(
    to top,
    var(--mint-200) 0 48%,
    var(--white) 48% 100%
  );
  border: 6px solid var(--mint-700);
  border-top: 0;
  border-radius: 8px 8px 36px 36px;
  transform: translateY(10px);
}

.hero-flask::after {
  position: absolute;
  width: 34px;
  height: 42px;
  content: "";
  border-right: 6px solid var(--mint-700);
  border-left: 6px solid var(--mint-700);
  transform: translateY(-53px);
}

.hero-flask span {
  position: absolute;
  z-index: 1;
  right: -7px;
  bottom: 20px;
  padding: 7px 13px;
  color: #775314;
  background: var(--white);
  border: 2px solid var(--yellow);
  border-radius: 11px;
  font-size: 0.88rem;
  font-weight: 900;
  transform: rotate(-4deg);
}

.start-panel,
.parent-note,
.manage-section {
  margin-top: 22px;
  padding: 32px;
  background: rgba(255, 255, 255, 0.97);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 10px 34px rgba(40, 82, 63, 0.07);
}

.panel-heading > div,
.section-heading > div {
  display: flex;
  align-items: flex-start;
  gap: 13px;
}

.panel-heading h2,
.section-heading h2,
.parent-note h2 {
  margin: 0;
  color: var(--mint-900);
  font-size: clamp(1.25rem, 3vw, 1.65rem);
  line-height: 1.35;
}

.panel-heading p,
.section-heading p,
.parent-note p {
  margin: 5px 0 0;
  color: var(--muted);
}

.step-label,
.section-number {
  display: inline-grid;
  width: 31px;
  height: 31px;
  flex: 0 0 auto;
  place-items: center;
  margin: 0;
  color: var(--white);
  background: var(--mint-500);
  border-radius: 9px;
  font-size: 0.8rem;
  font-weight: 900;
}

.field-label {
  display: block;
  margin: 22px 0 7px;
  color: var(--mint-900);
  font-size: 0.88rem;
  font-weight: 900;
}

.deck-select,
.name-input,
.share-import-form input,
.input-panel textarea,
.preview-table input {
  width: 100%;
  min-height: 50px;
  padding: 11px 13px;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: 11px;
  outline: 0;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease;
}

.deck-select {
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 800;
}

.deck-select:focus,
.name-input:focus,
.share-import-form input:focus,
.input-panel textarea:focus,
.preview-table input:focus {
  border-color: var(--mint-500);
  box-shadow: 0 0 0 4px rgba(74, 167, 124, 0.13);
}

.home-stats,
.complete-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 16px 0 26px;
}

.home-stats div,
.complete-stats div {
  display: flex;
  min-height: 76px;
  align-items: baseline;
  justify-content: center;
  gap: 7px;
  padding: 13px 10px;
  background: var(--mint-50);
  border: 1px solid var(--mint-200);
  border-radius: 13px;
}

.home-stats strong,
.complete-stats strong {
  color: var(--mint-900);
  font-size: 1.85rem;
  line-height: 1;
}

.home-stats span,
.complete-stats span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.scope-picker {
  padding: 0;
  margin: 0;
  border: 0;
}

.scope-picker legend,
.mode-picker > p {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  color: var(--mint-900);
  font-weight: 900;
}

.segmented-control {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.segmented-control label {
  position: relative;
}

.segmented-control input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented-control span {
  display: grid;
  min-height: 52px;
  place-items: center;
  padding: 10px;
  color: #53635b;
  background: #f6f9f7;
  border: 2px solid var(--line);
  border-radius: 12px;
  font-weight: 850;
  cursor: pointer;
}

.segmented-control input:checked + span {
  color: var(--mint-900);
  background: var(--mint-100);
  border-color: var(--mint-500);
  box-shadow: inset 0 0 0 1px var(--mint-500);
}

.segmented-control input:focus-visible + span {
  outline: 3px solid rgba(74, 167, 124, 0.25);
  outline-offset: 2px;
}

.segmented-control label.disabled span {
  color: #9ca8a2;
  background: #f4f5f4;
  cursor: not-allowed;
}

.mode-picker {
  margin-top: 27px;
}

.mode-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.mode-button {
  display: grid;
  min-height: 150px;
  align-content: center;
  justify-items: start;
  padding: 22px;
  text-align: left;
  border: 2px solid transparent;
  border-radius: 16px;
  box-shadow: 0 9px 22px rgba(40, 82, 63, 0.08);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}

.mode-button:hover {
  border-color: currentColor;
  box-shadow: 0 13px 28px rgba(40, 82, 63, 0.13);
  transform: translateY(-2px);
}

.read-mode {
  color: var(--mint-900);
  background: linear-gradient(145deg, var(--mint-100), #f5fcf8);
}

.write-mode {
  color: #764d22;
  background: linear-gradient(145deg, var(--orange-soft), #fff9f1);
}

.mode-button strong {
  margin: 4px 0 2px;
  font-size: clamp(1.35rem, 3vw, 1.8rem);
}

.mode-button > span:last-child {
  color: #5d6d65;
  font-size: 0.88rem;
  font-weight: 700;
}

.mode-kicker {
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.05em;
}

.ad-area {
  margin: 22px 0 0;
  padding: 14px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
  border-radius: 14px;
  text-align: center;
}

.ad-label {
  margin: 0 0 7px;
  color: #7d8a84;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.ad-preview {
  display: grid;
  min-height: 90px;
  place-items: center;
  color: #7d8a84;
  background: #f7f8f7;
  border: 1px dashed #b8c5bf;
  border-radius: 9px;
  font-size: 0.82rem;
}

.parent-note {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  background: linear-gradient(135deg, #fffdf7, #fff8df);
  border-color: #ecdfaa;
}

.parent-note > div {
  max-width: 690px;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 30px 4px 40px;
  color: var(--muted);
  font-size: 0.78rem;
}

.site-footer a {
  color: var(--mint-700);
  font-weight: 900;
  text-decoration: none;
}

.primary-action,
.secondary-action,
.toolbar-button,
.mini-button {
  display: inline-flex;
  min-height: 52px;
  align-items: center;
  justify-content: center;
  padding: 12px 19px;
  border-radius: 12px;
  font-weight: 900;
  transition:
    transform 0.16s ease,
    box-shadow 0.16s ease,
    opacity 0.16s ease;
}

.primary-action {
  color: var(--white);
  background: var(--mint-700);
  box-shadow: 0 8px 18px rgba(45, 114, 87, 0.2);
}

.primary-action:hover,
.secondary-action:hover,
.toolbar-button:hover,
.mini-button:hover {
  transform: translateY(-1px);
}

.primary-action:active,
.secondary-action:active,
.toolbar-button:active,
.mini-button:active {
  transform: translateY(1px);
}

.secondary-action {
  color: var(--mint-900);
  background: var(--white);
  border: 2px solid var(--mint-200);
}

.primary-action.compact,
.secondary-action.compact {
  min-height: 44px;
  padding: 9px 15px;
  font-size: 0.88rem;
}

button:disabled {
  opacity: 0.58;
}

.boot-error,
.toast {
  position: fixed;
  z-index: 100;
  right: 16px;
  left: 16px;
  max-width: 720px;
  margin: auto;
  padding: 13px 16px;
  border-radius: 12px;
  font-weight: 800;
  box-shadow: var(--shadow);
}

.boot-error {
  top: 14px;
  color: #7e302f;
  background: #fff2f1;
  border: 1px solid #efc1be;
}

.toast {
  bottom: max(16px, env(safe-area-inset-bottom));
  color: var(--white);
  background: rgba(25, 72, 56, 0.96);
  text-align: center;
}

/* Study */
body.study-active {
  overflow: hidden;
  background: var(--mint-100);
}

body.study-active .site-header,
body.study-active .site-footer {
  display: none;
}

body.study-active .app-shell {
  width: 100%;
  max-width: none;
}

.study-screen {
  min-height: 100dvh;
  padding: max(10px, env(safe-area-inset-top))
    max(10px, env(safe-area-inset-right)) max(10px, env(safe-area-inset-bottom))
    max(10px, env(safe-area-inset-left));
}

.study-toolbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 8px;
  width: min(980px, 100%);
  margin: 0 auto 8px;
}

.toolbar-button,
.mode-chip,
.position-chip {
  min-height: 42px;
  padding: 8px 13px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--line);
  border-radius: 11px;
  font-size: 0.84rem;
  font-weight: 900;
}

.toolbar-button {
  justify-self: start;
  color: var(--mint-700);
}

.mode-chip {
  color: var(--mint-900);
  background: var(--yellow-soft);
  border-color: #e9d47d;
}

.position-chip {
  min-width: 84px;
  justify-self: end;
  color: var(--mint-900);
  text-align: center;
}

.progress-track {
  width: min(980px, 100%);
  height: 7px;
  margin: 0 auto 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.75);
  border-radius: 999px;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--mint-500);
  border-radius: inherit;
  transition: width 0.22s ease;
}

.study-card {
  position: relative;
  display: grid;
  grid-template-rows: minmax(190px, 1fr) auto auto;
  gap: 14px;
  width: min(980px, 100%);
  margin: 0 auto;
  min-height: calc(100dvh - 86px);
  max-height: calc(100dvh - 86px);
  padding: clamp(22px, 4vw, 44px);
  overflow: auto;
  background: var(--white);
  border: 2px solid var(--mint-200);
  border-radius: 22px;
  box-shadow: 0 16px 44px rgba(40, 82, 63, 0.12);
}

.favorite-button {
  position: absolute;
  z-index: 3;
  top: 15px;
  right: 15px;
  display: inline-flex;
  min-width: 126px;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 11px;
  color: #66716c;
  background: var(--white);
  border: 2px solid var(--line);
  border-radius: 13px;
  font-size: 0.76rem;
  font-weight: 850;
  transition:
    color 0.16s ease,
    background 0.16s ease,
    border-color 0.16s ease,
    transform 0.16s ease;
}

.favorite-button:hover {
  transform: translateY(-1px);
}

.favorite-button #favoriteIcon {
  color: #87918c;
  font-size: 1.8rem;
  line-height: 1;
}

.favorite-button.active {
  color: #755414;
  background: var(--yellow-soft);
  border-color: var(--yellow);
}

.favorite-button.active #favoriteIcon {
  color: #edae16;
  filter: drop-shadow(0 1px 0 rgba(119, 83, 20, 0.15));
}

.question-area {
  display: grid;
  align-content: center;
  justify-items: center;
  min-height: 0;
  padding: 54px 10px 6px;
  text-align: center;
}

.study-prompt {
  margin: 0 0 20px;
  color: var(--mint-700);
  font-size: clamp(0.95rem, 2vw, 1.2rem);
  font-weight: 900;
}

.question-text {
  max-width: 100%;
  overflow-wrap: anywhere;
  font-family: var(--school-font);
  font-size: clamp(3.2rem, 10vw, 8.4rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.question-target {
  padding-bottom: 0.03em;
  border-bottom: 0.09em solid var(--orange);
}

.answer-panel {
  display: grid;
  justify-items: center;
  padding: 14px 20px;
  background: var(--cream);
  border: 2px solid #ecd990;
  border-radius: 15px;
  text-align: center;
}

.answer-panel p {
  margin: 0;
  color: #8c6424;
  font-size: 0.77rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.answer-panel strong {
  font-family: var(--school-font);
  font-size: clamp(2rem, 6vw, 4.8rem);
  line-height: 1.3;
}

.answer-panel span {
  color: var(--muted);
  font-family: var(--school-font);
  font-size: clamp(1rem, 2.6vw, 1.45rem);
}

.study-actions {
  display: grid;
  place-items: center;
  padding-bottom: max(2px, env(safe-area-inset-bottom));
}

.answer-action {
  width: min(430px, 100%);
  min-height: 66px;
  font-size: 1.13rem;
}

.result-actions {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 12px;
  width: min(720px, 100%);
}

.result-actions button {
  min-height: 62px;
  font-size: 1rem;
}

.success-action {
  background: var(--mint-700);
}

/* Completion */
.complete-screen {
  display: grid;
  min-height: 70vh;
  place-items: center;
  padding: 30px 0;
}

.complete-card {
  width: min(620px, 100%);
  padding: clamp(30px, 6vw, 55px);
  background: var(--white);
  border: 1px solid var(--mint-200);
  border-radius: 24px;
  box-shadow: var(--shadow);
  text-align: center;
}

.complete-card h2 {
  margin: 6px 0 10px;
  color: var(--mint-900);
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.2;
}

.complete-card > p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
}

.complete-stats {
  grid-template-columns: 1fr 1fr;
  margin: 24px 0;
}

.complete-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* Parent management */
.manage-main {
  padding-bottom: 20px;
}

.manage-hero {
  padding: 45px 4px 18px;
}

.manage-hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
}

.manage-hero > p:last-child {
  max-width: 760px;
  margin: 16px 0 0;
  color: var(--muted);
  font-weight: 650;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.section-number {
  width: 40px;
  color: var(--mint-700);
  background: var(--mint-100);
  border: 1px solid var(--mint-200);
}

.deck-list {
  display: grid;
  gap: 11px;
  margin-top: 22px;
}

.deck-manage-card {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto;
  align-items: center;
  gap: 20px;
  padding: 17px;
  background: #f9fbfa;
  border: 2px solid transparent;
  border-radius: 14px;
}

.deck-manage-card.active {
  background: var(--mint-50);
  border-color: var(--mint-200);
}

.deck-title-row {
  display: flex;
  align-items: center;
  gap: 9px;
}

.deck-title-row h3 {
  margin: 0;
  color: var(--mint-900);
  font-size: 1.06rem;
}

.deck-card-info p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.active-chip {
  padding: 3px 7px;
  color: var(--mint-700);
  background: var(--mint-100);
  border-radius: 7px;
  font-size: 0.67rem;
  font-weight: 900;
}

.deck-card-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.mini-button {
  min-height: 38px;
  padding: 7px 10px;
  color: var(--mint-700);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 9px;
  font-size: 0.75rem;
}

.mini-button.use {
  color: var(--white);
  background: var(--mint-700);
  border-color: var(--mint-700);
}

.mini-button.danger {
  color: var(--danger);
}

.inline-form {
  display: grid;
  grid-template-columns: minmax(180px, 340px) auto;
  gap: 9px;
  align-items: center;
}

.share-import-form input {
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-align: center;
}

.form-message {
  min-height: 1.5em;
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.form-message.ok {
  color: var(--mint-700);
}

.form-message.error {
  color: var(--danger);
}

.editor-section {
  border-color: var(--mint-500);
}

.name-input {
  max-width: 680px;
}

.input-tabs {
  display: flex;
  gap: 7px;
  margin-top: 25px;
  overflow-x: auto;
  padding-bottom: 2px;
}

.input-tab {
  min-height: 44px;
  flex: 0 0 auto;
  padding: 9px 14px;
  color: var(--muted);
  background: #f4f7f5;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 0.82rem;
  font-weight: 850;
}

.input-tab.active {
  color: var(--white);
  background: var(--mint-700);
  border-color: var(--mint-700);
}

.input-panel {
  margin-top: 17px;
  padding: 20px;
  background: var(--mint-50);
  border: 1px solid var(--mint-200);
  border-radius: 14px;
}

.input-panel .field-label {
  margin-top: 0;
}

.input-panel textarea {
  min-height: 190px;
  resize: vertical;
  line-height: 1.8;
}

.input-help {
  margin: 13px 0;
  padding: 13px 15px;
  background: var(--white);
  border-left: 4px solid var(--yellow);
  border-radius: 8px;
}

.input-help strong {
  color: var(--mint-900);
  font-size: 0.82rem;
}

.input-help p,
.input-panel > p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.csv-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.file-picker {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  padding: 10px 16px;
  color: var(--white);
  background: var(--mint-700);
  border-radius: 11px;
  font-weight: 900;
  cursor: pointer;
}

.file-picker input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
}

.preview-section {
  margin-top: 24px;
  padding-top: 23px;
  border-top: 1px solid var(--line);
}

.preview-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 15px;
}

.preview-heading h3 {
  margin: 0;
  color: var(--mint-900);
}

.preview-heading p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.preview-table-wrap {
  margin-top: 13px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.preview-table {
  width: 100%;
  min-width: 780px;
  border-collapse: collapse;
  background: var(--white);
}

.preview-table th,
.preview-table td {
  padding: 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

.preview-table th {
  color: var(--mint-900);
  background: var(--mint-100);
  font-size: 0.77rem;
}

.preview-table th:first-child,
.preview-table td:first-child {
  width: 38%;
}

.preview-table th:nth-child(2),
.preview-table td:nth-child(2),
.preview-table th:nth-child(3),
.preview-table td:nth-child(3) {
  width: 29%;
}

.preview-table input {
  min-height: 42px;
  padding: 8px 10px;
  font-size: 0.87rem;
}

.row-delete {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  color: var(--danger);
  background: #fff3f2;
  border-radius: 9px;
  font-size: 1.15rem;
  font-weight: 900;
}

.validation-summary {
  margin: 13px 0;
  padding: 13px 15px;
  color: #843c39;
  background: #fff3f2;
  border: 1px solid #edc4c1;
  border-radius: 10px;
  font-size: 0.82rem;
}

.validation-summary ul {
  margin: 7px 0 0;
  padding-left: 1.4em;
}

.editor-actions {
  display: flex;
  gap: 9px;
  margin-top: 17px;
}

.empty-message {
  margin: 0;
  padding: 25px;
  color: var(--muted);
  background: #f7f9f8;
  border: 1px dashed #b8c5bf;
  border-radius: 12px;
  text-align: center;
}

.share-dialog {
  width: min(430px, calc(100% - 28px));
  padding: 0;
  color: var(--ink);
  background: var(--white);
  border: 0;
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.share-dialog::backdrop {
  background: rgba(25, 72, 56, 0.45);
  backdrop-filter: blur(3px);
}

.share-dialog form {
  padding: 28px;
  text-align: center;
}

.share-dialog h2 {
  margin: 0;
  color: var(--mint-900);
}

.share-dialog > form > p:not(.eyebrow) {
  color: var(--muted);
  font-size: 0.84rem;
}

.share-code {
  display: block;
  margin: 18px 0 12px;
  color: var(--mint-900);
  font-size: clamp(2.3rem, 11vw, 3.7rem);
  font-weight: 950;
  letter-spacing: 0.14em;
  line-height: 1;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 20px;
}

@media (max-width: 760px) {
  .app-shell {
    width: min(100% - 20px, 1120px);
  }

  .site-header {
    gap: 10px;
    padding: 12px 1px;
  }

  .brand-copy small {
    display: none;
  }

  .brand img {
    width: 42px;
    height: 42px;
  }

  .parent-menu-link {
    min-height: 40px;
    padding: 8px 10px;
    font-size: 0.76rem;
  }

  .home-hero {
    grid-template-columns: 1fr 106px;
    gap: 10px;
    padding: 31px 22px;
    border-radius: 18px;
  }

  .home-hero h1 {
    font-size: clamp(2.35rem, 13vw, 3.55rem);
  }

  .home-hero > div > p:last-child {
    margin-top: 12px;
    font-size: 0.92rem;
  }

  .hero-flask {
    width: 102px;
    height: 102px;
  }

  .hero-flask::before {
    width: 40px;
    height: 53px;
    border-width: 4px;
    border-top: 0;
    border-radius: 5px 5px 21px 21px;
    transform: translateY(6px);
  }

  .hero-flask::after {
    width: 18px;
    height: 23px;
    border-width: 0 4px;
    border-style: solid;
    border-color: var(--mint-700);
    transform: translateY(-29px);
  }

  .hero-flask span {
    right: -4px;
    bottom: 5px;
    padding: 4px 7px;
    font-size: 0.59rem;
  }

  .start-panel,
  .parent-note,
  .manage-section {
    padding: 21px 17px;
    border-radius: 16px;
  }

  .home-stats {
    gap: 6px;
  }

  .home-stats div {
    display: grid;
    min-height: 69px;
    align-content: center;
    justify-items: center;
    gap: 2px;
  }

  .home-stats strong {
    font-size: 1.55rem;
  }

  .segmented-control,
  .mode-buttons,
  .complete-actions {
    grid-template-columns: 1fr;
  }

  .mode-button {
    min-height: 125px;
  }

  .parent-note,
  .section-heading,
  .preview-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .parent-note .text-button {
    width: 100%;
  }

  .study-card {
    min-height: calc(100dvh - 80px);
    max-height: calc(100dvh - 80px);
    padding: 18px 13px;
    border-radius: 17px;
  }

  .favorite-button {
    top: 11px;
    right: 11px;
    min-width: 50px;
    min-height: 50px;
    padding: 6px;
  }

  .favorite-button #favoriteText {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
  }

  .question-area {
    padding: 52px 4px 4px;
  }

  .question-text {
    font-size: clamp(2.8rem, 15vw, 6.7rem);
  }

  .result-actions {
    grid-template-columns: 1fr;
  }

  .result-actions .success-action {
    order: 1;
  }

  .result-actions .secondary-action {
    order: 2;
    min-height: 52px;
  }

  .deck-manage-card {
    grid-template-columns: 1fr;
    gap: 13px;
  }

  .deck-card-actions {
    justify-content: flex-start;
  }

  .inline-form {
    grid-template-columns: 1fr;
  }

  .input-panel {
    padding: 15px;
  }

  .editor-actions,
  .dialog-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }
}

@media (max-width: 430px) {
  .home-hero {
    grid-template-columns: 1fr;
  }

  .hero-flask {
    display: none;
  }

  .panel-heading > div,
  .section-heading > div {
    gap: 9px;
  }
}

@media (max-height: 540px) and (orientation: landscape) {
  .study-screen {
    padding-top: 5px;
    padding-bottom: 5px;
  }

  .study-toolbar {
    margin-bottom: 4px;
  }

  .toolbar-button,
  .mode-chip,
  .position-chip {
    min-height: 33px;
    padding: 5px 9px;
    font-size: 0.7rem;
  }

  .progress-track {
    height: 5px;
    margin-bottom: 4px;
  }

  .study-card {
    grid-template-columns: minmax(0, 1.1fr) minmax(220px, 0.9fr);
    grid-template-rows: minmax(0, 1fr) auto;
    grid-template-areas: "question answer" "question actions";
    min-height: calc(100dvh - 50px);
    max-height: calc(100dvh - 50px);
    gap: 8px 14px;
    padding: 12px 16px;
  }

  .question-area {
    grid-area: question;
    padding: 38px 4px 4px;
  }

  .study-prompt {
    margin-bottom: 7px;
    font-size: 0.75rem;
  }

  .question-text {
    font-size: clamp(2.2rem, 8vw, 4.6rem);
  }

  .answer-panel {
    grid-area: answer;
    align-self: end;
    padding: 7px 12px;
  }

  .answer-panel strong {
    font-size: clamp(1.45rem, 4.2vw, 2.8rem);
  }

  .answer-panel span {
    font-size: 0.8rem;
  }

  .study-actions {
    grid-area: actions;
  }

  .answer-action,
  .result-actions button {
    min-height: 42px;
    padding: 7px 11px;
    font-size: 0.78rem;
  }

  .result-actions {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .favorite-button {
    top: 8px;
    right: 8px;
    min-width: 42px;
    min-height: 39px;
  }

  .favorite-button #favoriteIcon {
    font-size: 1.45rem;
  }

  .favorite-button #favoriteText {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}