:root {
  color-scheme: light;
  --ink: #17202b;
  --ink-soft: #53606f;
  --paper: #f5f1ea;
  --surface: #fffdf9;
  --surface-strong: #ffffff;
  --line: #ded7cc;
  --line-strong: #c9c0b3;
  --accent: #b13e3a;
  --accent-dark: #8e2f2c;
  --accent-soft: #f6dfdc;
  --indigo: #243447;
  --indigo-soft: #e8edf2;
  --success: #2f6a54;
  --shadow-sm: 0 8px 24px rgba(31, 36, 42, 0.07);
  --shadow-md: 0 22px 64px rgba(31, 36, 42, 0.12);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --content: 1160px;
  --font-ui: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Noto Sans CJK JP", "Noto Sans JP", Arial, sans-serif;
  --font-jp: "Noto Sans CJK JP", "Yu Gothic", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
}

body {
  margin: 0;
  min-width: 300px;
  background:
    radial-gradient(circle at 8% 0%, rgba(177, 62, 58, 0.08), transparent 28rem),
    radial-gradient(circle at 95% 24%, rgba(36, 52, 71, 0.06), transparent 30rem),
    var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.16;
  background-image:
    linear-gradient(rgba(23, 32, 43, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 32, 43, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

button,
select,
summary,
a {
  font: inherit;
}

button,
select,
summary {
  -webkit-tap-highlight-color: transparent;
}

button {
  border: 0;
}

a {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  transform: translateY(-160%);
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  padding: 10px 14px;
  text-decoration: none;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid rgba(201, 192, 179, 0.72);
  background: rgba(245, 241, 234, 0.86);
  backdrop-filter: blur(18px) saturate(1.15);
}

.header-inner {
  width: min(calc(100% - 32px), var(--content));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: var(--indigo);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.15), var(--shadow-sm);
  color: #fff;
  font-family: var(--font-jp);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
}

.brand-copy {
  display: grid;
  gap: 1px;
}

.brand-copy strong {
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.brand-copy small {
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.2;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-nav > a,
.language-menu > summary {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 8px 13px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  list-style: none;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.header-nav > a:hover,
.language-menu > summary:hover,
.language-menu[open] > summary {
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
}

.header-nav > a:active,
.language-menu > summary:active {
  transform: scale(0.98);
}

.language-menu {
  position: relative;
}

.language-menu > summary::-webkit-details-marker {
  display: none;
}

.language-menu > summary::after {
  content: "⌄";
  margin-left: 7px;
  font-size: 12px;
  transform: translateY(-1px);
}

.language-popover {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 190px;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 253, 249, 0.98);
  box-shadow: var(--shadow-md);
}

.language-popover a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 42px;
  border-radius: 10px;
  padding: 8px 10px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.language-popover a:hover,
.language-popover a[aria-current="page"] {
  background: var(--indigo-soft);
  color: var(--ink);
}

.language-popover a[aria-current="page"]::after {
  content: "✓";
  color: var(--success);
  font-weight: 800;
}

main {
  overflow: clip;
}

.hero,
.content-section,
.notes-section {
  width: min(calc(100% - 32px), var(--content));
  margin-inline: auto;
}

.hero {
  min-height: 620px;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.88fr);
  align-items: center;
  gap: clamp(36px, 7vw, 90px);
  padding: clamp(66px, 10vw, 118px) 0 80px;
}

.hero-copy {
  max-width: 720px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  line-height: 1.4;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(44px, 6.6vw, 82px);
  font-weight: 760;
  letter-spacing: -0.055em;
  line-height: 0.98;
  text-wrap: balance;
}

.hero-description {
  max-width: 680px;
  margin: 26px 0 0;
  color: var(--ink-soft);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: 999px;
  padding: 11px 20px;
  font-size: 15px;
  font-weight: 750;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button:active {
  transform: translateY(0);
}

.button-primary {
  background: var(--accent);
  box-shadow: 0 12px 26px rgba(177, 62, 58, 0.22);
  color: #fff;
}

.button-primary:hover {
  background: var(--accent-dark);
}

.button-secondary {
  border: 1px solid var(--line-strong);
  background: rgba(255, 253, 249, 0.6);
  color: var(--ink);
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin: 34px 0 0;
  padding: 0;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 650;
  list-style: none;
}

.hero-points li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.hero-points li::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.hero-visual {
  position: relative;
  min-height: 470px;
  display: grid;
  place-items: center;
}

.kana-orbit {
  position: relative;
  width: min(100%, 450px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid rgba(177, 62, 58, 0.22);
  border-radius: 50%;
  background: rgba(255, 253, 249, 0.52);
  box-shadow: var(--shadow-md);
}

.kana-orbit::before,
.kana-orbit::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.kana-orbit::before {
  inset: 9%;
  border: 1px dashed rgba(36, 52, 71, 0.22);
}

.kana-orbit::after {
  inset: 28%;
  background: var(--indigo);
  box-shadow: 0 18px 54px rgba(36, 52, 71, 0.28);
}

.orbit-character {
  position: relative;
  z-index: 2;
  color: #fff;
  font-family: var(--font-jp);
  font-size: clamp(90px, 13vw, 148px);
  font-weight: 700;
  line-height: 1;
}

.orbit-chip {
  position: absolute;
  z-index: 3;
  min-width: 74px;
  min-height: 74px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--surface-strong);
  box-shadow: var(--shadow-sm);
  color: var(--ink);
  font-family: var(--font-jp);
  font-size: 32px;
  font-weight: 700;
}

.orbit-chip:nth-of-type(1) {
  top: 8%;
  left: 10%;
  transform: rotate(-7deg);
}

.orbit-chip:nth-of-type(2) {
  top: 12%;
  right: 7%;
  transform: rotate(6deg);
}

.orbit-chip:nth-of-type(3) {
  bottom: 9%;
  left: 8%;
  transform: rotate(5deg);
}

.orbit-chip:nth-of-type(4) {
  right: 4%;
  bottom: 13%;
  transform: rotate(-6deg);
}

.visual-note {
  position: absolute;
  right: 0;
  bottom: 3%;
  z-index: 4;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-strong);
  box-shadow: var(--shadow-sm);
  padding: 9px 13px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
}

.visual-note::before {
  content: "▶";
  width: 23px;
  height: 23px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 9px;
}

.content-section,
.notes-section {
  padding: 92px 0;
}

.content-section + .content-section,
.notes-section {
  border-top: 1px solid rgba(201, 192, 179, 0.78);
}

.section-heading {
  max-width: 760px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 740;
  letter-spacing: -0.045em;
  line-height: 1.05;
  text-wrap: balance;
}

.section-description {
  margin: 20px 0 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.75;
}

.chart-toolbar {
  margin-top: 34px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 22px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 253, 249, 0.72);
}

.control-block {
  min-width: 0;
}

.control-label {
  display: block;
  margin: 0 0 7px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.segmented-control {
  display: inline-grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(max-content, 1fr);
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--paper);
}

.segmented-control button {
  min-height: 38px;
  border-radius: 9px;
  background: transparent;
  padding: 7px 13px;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 750;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease, box-shadow 150ms ease;
}

.segmented-control button:hover {
  color: var(--ink);
}

.segmented-control button[aria-pressed="true"] {
  background: var(--surface-strong);
  box-shadow: 0 4px 14px rgba(31, 36, 42, 0.09);
  color: var(--ink);
}

.audio-hint {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 2px 3px 0;
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 600;
}

.audio-hint::before {
  content: "♪";
  width: 29px;
  height: 29px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 800;
}

.kana-groups {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.kana-group {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 249, 0.82);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.kana-group-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 26px 20px;
  border-bottom: 1px solid var(--line);
}

.kana-group-title-wrap {
  min-width: 0;
}

.kana-group-title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.kana-group-title-jp {
  color: var(--accent-dark);
  font-family: var(--font-jp);
  font-size: 16px;
  font-weight: 750;
}

.kana-group-description {
  max-width: 760px;
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
}

.kana-group-count {
  flex: 0 0 auto;
  border-radius: 999px;
  background: var(--indigo-soft);
  padding: 5px 10px;
  color: var(--indigo);
  font-size: 12px;
  font-weight: 800;
}

.kana-table {
  display: grid;
  gap: 10px;
  padding: 22px 24px 26px;
}

.kana-row {
  display: grid;
  grid-template-columns: 44px repeat(5, minmax(0, 1fr));
  gap: 10px;
  align-items: stretch;
}

.kana-row.is-three {
  grid-template-columns: 44px repeat(3, minmax(0, 1fr));
}

.kana-row.is-one {
  grid-template-columns: 44px minmax(120px, 1fr) repeat(4, minmax(0, 1fr));
}

.row-label {
  display: grid;
  place-items: center;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.kana-placeholder {
  min-height: 86px;
}

.kana-cell {
  position: relative;
  min-width: 0;
  min-height: 86px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface-strong);
  color: var(--ink);
  cursor: pointer;
  box-shadow: 0 2px 0 rgba(31, 36, 42, 0.03);
  transition: transform 150ms ease, border-color 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.kana-cell:hover {
  z-index: 1;
  transform: translateY(-2px);
  border-color: rgba(177, 62, 58, 0.42);
  box-shadow: 0 10px 22px rgba(31, 36, 42, 0.09);
}

.kana-cell:active {
  transform: translateY(0) scale(0.985);
}

.kana-cell.is-speaking {
  border-color: var(--accent);
  background: #fff8f6;
  box-shadow: 0 0 0 4px rgba(177, 62, 58, 0.10);
}

.kana-glyph,
.kana-pair {
  font-family: var(--font-jp);
  font-weight: 700;
  line-height: 1;
}

.kana-glyph {
  font-size: clamp(27px, 3vw, 36px);
}

.kana-pair {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  font-size: clamp(24px, 2.6vw, 32px);
}

.kana-pair span + span {
  position: relative;
  color: var(--accent-dark);
}

.kana-pair span + span::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 17%;
  width: 1px;
  height: 66%;
  background: var(--line);
}

.romaji {
  max-width: 100%;
  overflow-wrap: anywhere;
  color: var(--ink-soft);
  font-size: 11px;
  font-weight: 780;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-transform: lowercase;
}

.kana-cell::after {
  content: "♪";
  position: absolute;
  top: 6px;
  right: 7px;
  color: var(--line-strong);
  font-size: 10px;
  font-weight: 800;
  opacity: 0;
  transition: opacity 150ms ease, color 150ms ease;
}

.kana-cell:hover::after,
.kana-cell:focus-visible::after,
.kana-cell.is-speaking::after {
  opacity: 1;
}

.kana-cell.is-speaking::after {
  color: var(--accent);
}

.flashcard-shell {
  margin-top: 34px;
  display: grid;
  grid-template-columns: minmax(280px, 0.38fr) minmax(0, 0.62fr);
  gap: 22px;
  border-radius: var(--radius-lg);
  background: var(--indigo);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.flashcard-sidebar {
  padding: 32px;
  color: #fff;
}

.flashcard-sidebar .control-label {
  color: rgba(255, 255, 255, 0.68);
}

.flashcard-sidebar .segmented-control {
  width: 100%;
  grid-auto-columns: 1fr;
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
}

.flashcard-sidebar .segmented-control button {
  color: rgba(255, 255, 255, 0.72);
}

.flashcard-sidebar .segmented-control button:hover {
  color: #fff;
}

.flashcard-sidebar .segmented-control button[aria-pressed="true"] {
  background: #fff;
  color: var(--indigo);
}

.flashcard-control + .flashcard-control {
  margin-top: 24px;
}

.select-wrap {
  position: relative;
}

.select-wrap::after {
  content: "⌄";
  position: absolute;
  top: 50%;
  right: 14px;
  transform: translateY(-58%);
  pointer-events: none;
  color: rgba(255, 255, 255, 0.7);
}

.study-select {
  width: 100%;
  min-height: 48px;
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 13px;
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  padding: 10px 42px 10px 13px;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.study-select option {
  color: var(--ink);
}

.flash-instruction {
  margin: 30px 0 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
  line-height: 1.7;
}

.flashcard-stage {
  min-height: 510px;
  display: grid;
  align-content: center;
  padding: 30px;
  background:
    radial-gradient(circle at 50% -10%, rgba(177, 62, 58, 0.24), transparent 48%),
    #1d2a3a;
}

.flashcard {
  position: relative;
  width: min(100%, 520px);
  min-height: 360px;
  margin: 0 auto;
  display: grid;
  align-content: center;
  justify-items: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 28px;
  background: var(--surface-strong);
  box-shadow: 0 26px 70px rgba(0, 0, 0, 0.24);
  padding: 38px 28px 30px;
  color: var(--ink);
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.flashcard::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(135deg, rgba(177, 62, 58, 0.06), transparent 38%),
    radial-gradient(circle at 92% 8%, rgba(36, 52, 71, 0.08), transparent 24%);
}

.flashcard:hover {
  transform: translateY(-3px);
  box-shadow: 0 32px 82px rgba(0, 0, 0, 0.29);
}

.flashcard:active {
  transform: translateY(0) scale(0.992);
}

.card-badge {
  position: absolute;
  top: 20px;
  left: 22px;
  border-radius: 999px;
  background: var(--indigo-soft);
  padding: 5px 10px;
  color: var(--indigo);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.card-kana {
  display: block;
  font-family: var(--font-jp);
  font-size: clamp(96px, 17vw, 150px);
  font-weight: 700;
  line-height: 1;
}

.card-reading {
  min-height: 34px;
  margin-top: 18px;
  color: var(--accent-dark);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.card-example {
  min-height: 26px;
  margin-top: 2px;
  color: var(--ink-soft);
  font-family: var(--font-jp);
  font-size: 13px;
  font-weight: 650;
}

.card-action {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
}

.card-action::before {
  content: "♪";
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 12px;
}

.flashcard.is-revealed .card-action::before {
  content: "→";
  background: var(--indigo-soft);
  color: var(--indigo);
}

.flashcard-footer {
  width: min(100%, 520px);
  margin: 16px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 12px;
  font-weight: 650;
}

.shuffle-button {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  padding: 7px 12px;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: background 150ms ease;
}

.shuffle-button:hover {
  background: rgba(255, 255, 255, 0.14);
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.note-card {
  min-height: 230px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 253, 249, 0.8);
  padding: 25px;
}

.note-number {
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 850;
}

.note-card h3 {
  margin: 28px 0 9px;
  font-size: 19px;
  line-height: 1.3;
}

.note-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.75;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: rgba(255, 253, 249, 0.52);
}

.footer-inner {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 32px 0;
}

.footer-copy {
  color: var(--ink-soft);
  font-size: 13px;
}

.footer-copy strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 14px;
}

.footer-domain {
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: max(20px, env(safe-area-inset-bottom));
  z-index: 100;
  max-width: min(calc(100% - 32px), 520px);
  transform: translate(-50%, 24px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(23, 32, 43, 0.94);
  box-shadow: var(--shadow-md);
  padding: 10px 15px;
  color: #fff;
  font-size: 13px;
  font-weight: 650;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}

.toast.is-visible {
  transform: translate(-50%, 0);
  opacity: 1;
}

.noscript-message {
  width: min(calc(100% - 32px), var(--content));
  margin: 20px auto;
  border: 1px solid #d6b35d;
  border-radius: 12px;
  background: #fff8df;
  padding: 14px 16px;
  color: #5c4b20;
  font-size: 14px;
}

/* Landing and 404 pages */
.utility-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 16px;
}

.utility-card {
  width: min(100%, 680px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 253, 249, 0.9);
  box-shadow: var(--shadow-md);
  padding: clamp(30px, 7vw, 64px);
  text-align: center;
}

.utility-mark {
  width: 76px;
  height: 76px;
  margin: 0 auto 24px;
  display: grid;
  place-items: center;
  border-radius: 24px;
  background: var(--indigo);
  color: #fff;
  font-family: var(--font-jp);
  font-size: 42px;
  font-weight: 700;
}

.utility-card h1 {
  margin: 0;
  font-size: clamp(34px, 7vw, 54px);
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.utility-card p {
  margin: 18px auto 0;
  max-width: 500px;
  color: var(--ink-soft);
}

.language-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
}

.language-grid a {
  min-height: 52px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 14px;
  font-weight: 750;
  text-decoration: none;
}

.language-grid a:hover {
  border-color: rgba(177, 62, 58, 0.42);
  background: #fff8f6;
}

:focus-visible {
  outline: 3px solid rgba(177, 62, 58, 0.34);
  outline-offset: 3px;
}

@media (max-width: 960px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 58px;
    padding-top: 76px;
  }

  .hero-copy {
    max-width: 820px;
  }

  .hero-visual {
    min-height: 430px;
  }

  .kana-orbit {
    width: min(82vw, 430px);
  }

  .flashcard-shell {
    grid-template-columns: 1fr;
  }

  .flashcard-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px 24px;
    align-items: end;
  }

  .flashcard-control + .flashcard-control {
    margin-top: 0;
  }

  .flash-instruction {
    grid-column: 1 / -1;
    margin-top: 2px;
  }

  .flashcard-stage {
    min-height: 500px;
  }
}

@media (max-width: 760px) {
  .header-inner {
    min-height: 66px;
  }

  .brand-copy small,
  .header-nav > a {
    display: none;
  }

  .hero,
  .content-section,
  .notes-section {
    width: min(calc(100% - 24px), var(--content));
  }

  .hero {
    padding-top: 60px;
    padding-bottom: 64px;
  }

  .hero h1 {
    font-size: clamp(43px, 13vw, 66px);
  }

  .content-section,
  .notes-section {
    padding: 72px 0;
  }

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

  .segmented-control {
    width: 100%;
  }

  .kana-group-header {
    padding: 21px 18px 18px;
  }

  .kana-table {
    padding: 18px 14px 20px;
  }

  .kana-row,
  .kana-row.is-three,
  .kana-row.is-one {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 7px;
  }

  .kana-row.is-three {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .kana-row.is-one {
    grid-template-columns: minmax(0, 1fr) repeat(4, minmax(0, 1fr));
  }

  .row-label {
    grid-column: 1 / -1;
    min-height: 22px;
    place-items: center start;
    padding-left: 2px;
  }

  .kana-cell,
  .kana-placeholder {
    min-height: 76px;
  }

  .kana-cell {
    border-radius: 11px;
  }

  .kana-pair {
    flex-direction: column;
    gap: 2px;
    font-size: 25px;
  }

  .kana-pair span + span::before {
    display: none;
  }

  .kana-cell::after {
    display: none;
  }

  .flashcard-sidebar {
    grid-template-columns: 1fr;
    padding: 26px 20px;
  }

  .flashcard-control + .flashcard-control {
    margin-top: 2px;
  }

  .flashcard-stage {
    min-height: 460px;
    padding: 22px 14px;
  }

  .flashcard {
    min-height: 340px;
    border-radius: 24px;
  }

  .notes-grid {
    grid-template-columns: 1fr;
  }

  .note-card {
    min-height: 0;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }
}

@media (max-width: 520px) {
  .brand-mark {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    font-size: 22px;
  }

  .language-menu > summary {
    padding-inline: 11px;
  }

  .hero-description,
  .section-description {
    font-size: 16px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .hero-points {
    display: grid;
    gap: 11px;
  }

  .hero-visual {
    min-height: 340px;
  }

  .kana-orbit {
    width: min(88vw, 340px);
  }

  .orbit-chip {
    min-width: 58px;
    min-height: 58px;
    border-radius: 17px;
    font-size: 25px;
  }

  .visual-note {
    right: 50%;
    bottom: -2%;
    transform: translateX(50%);
    white-space: nowrap;
  }

  .kana-group-title {
    font-size: 21px;
  }

  .kana-group-count {
    display: none;
  }

  .kana-table {
    gap: 13px;
  }

  .kana-row,
  .kana-row.is-one {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 5px;
  }

  .kana-cell,
  .kana-placeholder {
    min-height: 69px;
  }

  .kana-glyph {
    font-size: 28px;
  }

  .kana-pair {
    font-size: 22px;
  }

  .romaji {
    font-size: 9px;
    letter-spacing: 0;
  }

  .flashcard-shell {
    border-radius: 22px;
  }

  .flashcard {
    min-height: 325px;
    padding-inline: 18px;
  }

  .card-kana {
    font-size: clamp(100px, 34vw, 142px);
  }

  .flashcard-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .shuffle-button {
    width: 100%;
    justify-content: center;
  }

  .language-grid {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}