:root {
  --md-primary: #2E6E42;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #B7F3B0;
  --md-on-primary-container: #04210A;
  --md-secondary: #52634C;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #D5E8CB;
  --md-on-secondary-container: #101F0C;
  --md-tertiary: #386569;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #BCEBEF;
  --md-on-tertiary-container: #002022;
  --md-error: #BA1A1A;
  --md-on-error: #FFFFFF;
  --md-error-container: #FFDAD6;
  --md-on-error-container: #410002;
  --md-background: #F5FBF0;
  --md-on-background: #1A1C18;
  --md-surface: #F5FBF0;
  --md-surface-container-lowest: #FFFFFF;
  --md-surface-container-low: #EFF5EA;
  --md-surface-container: #E9F0E3;
  --md-surface-container-high: #E3EADD;
  --md-surface-container-highest: #DEE4D8;
  --md-on-surface: #1A1C18;
  --md-on-surface-variant: #43483E;
  --md-outline: #73796D;
  --md-outline-variant: #C3C8BB;
  --md-scrim: #000000;
  --md-inverse-surface: #2F312B;
  --md-inverse-on-surface: #F1F1EA;

  --shape-xs: 4px;
  --shape-sm: 8px;
  --shape-md: 12px;
  --shape-lg: 16px;
  --shape-xl: 28px;
  --shape-full: 999px;

  --ease-standard: cubic-bezier(0.2, 0, 0, 1);
  --ease-standard-decel: cubic-bezier(0, 0, 0, 1);
  --ease-standard-accel: cubic-bezier(0.3, 0, 1, 1);
  --ease-emphasized: cubic-bezier(0.3, 0, 0.1, 1);

  --dur-short: 120ms;
  --dur-medium: 250ms;
  --dur-long: 420ms;

  --elev-1: 0 1px 2px rgba(0,0,0,.10), 0 1px 3px 1px rgba(0,0,0,.06);
  --elev-2: 0 1px 2px rgba(0,0,0,.12), 0 2px 6px 2px rgba(0,0,0,.08);
  --elev-3: 0 4px 8px 3px rgba(0,0,0,.10), 0 1px 3px rgba(0,0,0,.14);
}

@media (prefers-color-scheme: dark) {
  :root {
    --md-primary: #9CD69A;
    --md-on-primary: #023910;
    --md-primary-container: #0F5323;
    --md-on-primary-container: #B7F3B0;
    --md-secondary: #BACCB0;
    --md-on-secondary: #253422;
    --md-secondary-container: #3B4B36;
    --md-on-secondary-container: #D5E8CB;
    --md-tertiary: #A0CFD3;
    --md-on-tertiary: #00363A;
    --md-tertiary-container: #1E4D51;
    --md-on-tertiary-container: #BCEBEF;
    --md-error: #FFB4AB;
    --md-on-error: #690005;
    --md-error-container: #93000A;
    --md-on-error-container: #FFDAD6;
    --md-background: #11140F;
    --md-on-background: #E2E3DB;
    --md-surface: #11140F;
    --md-surface-container-lowest: #0C0F0A;
    --md-surface-container-low: #191C17;
    --md-surface-container: #1D211B;
    --md-surface-container-high: #282B25;
    --md-surface-container-highest: #33362F;
    --md-on-surface: #E2E3DB;
    --md-on-surface-variant: #C3C8BB;
    --md-outline: #8D9387;
    --md-outline-variant: #43483E;
    --md-inverse-surface: #E2E3DB;
    --md-inverse-on-surface: #2F312B;
    --elev-1: 0 1px 2px rgba(0,0,0,.30), 0 1px 3px 1px rgba(0,0,0,.24);
    --elev-2: 0 1px 2px rgba(0,0,0,.34), 0 2px 6px 2px rgba(0,0,0,.26);
    --elev-3: 0 4px 8px 3px rgba(0,0,0,.32), 0 1px 3px rgba(0,0,0,.36);
  }
}

@media (prefers-reduced-motion: reduce) {
  :root { --dur-short: 1ms; --dur-medium: 1ms; --dur-long: 1ms; }
}

* { box-sizing: border-box; }

html { color-scheme: light dark; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--md-background);
  color: var(--md-on-surface);
  font-family: 'Noto Sans JP', 'Hiragino Sans', 'Yu Gothic', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2 { font-family: 'M PLUS Rounded 1c', 'Noto Sans JP', sans-serif; margin: 0 0 8px; }

a { color: var(--md-primary); }

button { font-family: inherit; }

:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 2px;
  border-radius: var(--shape-xs);
}

.sheet-scrim {
  position: fixed; inset: 0;
  background: var(--md-scrim);
  opacity: 0;
  z-index: 40;
  transition: opacity var(--dur-medium) var(--ease-standard);
}
.sheet-scrim[data-open] { opacity: .32; }

/* --- Top app bar --- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: var(--md-surface);
  transition: box-shadow var(--dur-medium) var(--ease-standard), background-color var(--dur-medium) var(--ease-standard);
}
.topbar.scrolled { box-shadow: var(--elev-1); background: var(--md-surface-container-low); }
.topbar-inner {
  max-width: 920px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; min-width: 0; }
.brand-title { font-family: 'M PLUS Rounded 1c', sans-serif; font-weight: 700; font-size: 19px; color: var(--md-on-surface); }
.brand-sub { font-size: 12px; color: var(--md-on-surface-variant); letter-spacing: .02em; }

.icon-btn, .text-icon-btn, .swap-btn {
  position: relative;
  display: grid; place-items: center;
  width: 44px; height: 44px;
  border: none; border-radius: var(--shape-full);
  background: transparent;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--dur-short) var(--ease-standard), color var(--dur-short) var(--ease-standard);
}
.icon-btn svg, .text-icon-btn svg { width: 22px; height: 22px; }
.icon-btn:hover, .text-icon-btn:hover { background: color-mix(in srgb, var(--md-on-surface-variant) 8%, transparent); }
.icon-btn:active, .text-icon-btn:active { background: color-mix(in srgb, var(--md-on-surface-variant) 12%, transparent); }
.text-icon-btn:disabled { opacity: .38; cursor: default; }
.text-icon-btn:disabled:hover { background: transparent; }

/* --- Main layout --- */
.main { max-width: 920px; margin: 0 auto; padding: 8px 16px 32px; }
.lede {
  color: var(--md-on-surface-variant);
  max-width: 60ch;
  margin: 16px 0 20px;
}

.translator-card {
  margin-bottom: 16px;
}

/* --- Segmented control --- */
.segmented {
  position: relative;
  display: grid; grid-template-columns: 1fr 1fr;
  background: var(--md-surface-container-high);
  border-radius: var(--shape-full);
  padding: 4px;
  margin-bottom: 18px;
}
.segment-indicator {
  position: absolute; top: 4px; left: 4px; height: calc(100% - 8px);
  width: calc(50% - 4px);
  background: var(--md-primary-container);
  border-radius: var(--shape-full);
  transition: transform var(--dur-medium) var(--ease-emphasized);
  z-index: 0;
}
.segment {
  position: relative; z-index: 1;
  border: none; background: transparent;
  padding: 10px 12px;
  border-radius: var(--shape-full);
  font-size: 13.5px; font-weight: 600;
  color: var(--md-on-surface-variant);
  cursor: pointer;
  min-height: 44px;
  transition: color var(--dur-medium) var(--ease-standard);
  overflow: hidden;
}
.segment.active { color: var(--md-on-primary-container); }

/* --- Panes / fields --- */
.panes { display: flex; flex-direction: column; gap: 4px; }
.pane { display: flex; flex-direction: column; }
.pane-head { display: flex; align-items: center; justify-content: space-between; min-height: 32px; }
.pane-label { font-size: 13px; font-weight: 600; color: var(--md-on-surface-variant); padding: 6px 4px; }
.pane-actions { display: flex; align-items: center; gap: 2px; }

.field {
  width: 100%;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-lg);
  background: var(--md-surface-container-lowest);
  color: var(--md-on-surface);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  padding: 14px 16px;
  resize: none;
  transition: border-color var(--dur-short) var(--ease-standard), box-shadow var(--dur-short) var(--ease-standard);
}
textarea.field { min-height: 108px; }
.field:focus-visible, .field:focus-within { outline: none; border-color: var(--md-primary); box-shadow: 0 0 0 1px var(--md-primary); }

.field-output {
  min-height: 108px;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--md-surface-container);
}
.field-output:empty::before {
  content: attr(data-placeholder);
  color: var(--md-on-surface-variant);
  opacity: .7;
}
.pane-foot { display: flex; justify-content: flex-end; }
.count { font-size: 12px; color: var(--md-on-surface-variant); padding: 4px 6px; }

.swap-wrap { position: relative; display: flex; align-items: center; justify-content: center; padding: 4px 0; }
.swap-wrap::before {
  content: '';
  position: absolute;
  left: 0; right: 0; top: 50%; height: 1px;
  background: var(--md-outline-variant);
}
.swap-btn {
  position: relative; z-index: 1;
  width: 44px; height: 44px;
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}
.swap-btn svg { width: 20px; height: 20px; transition: transform var(--dur-medium) var(--ease-emphasized); }
.swap-btn:hover { background: color-mix(in srgb, var(--md-primary) 14%, var(--md-primary-container)); }
.swap-btn.spin svg { transform: rotate(180deg); }

/* --- Chips --- */
.chips-area { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; }
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.chip-row-label { font-size: 12px; color: var(--md-on-surface-variant); margin-right: 2px; }
.chip {
  display: inline-flex; align-items: center;
  padding: 5px 12px;
  border-radius: var(--shape-full);
  font-size: 12.5px;
  border: 1px solid transparent;
  animation: chip-in var(--dur-medium) var(--ease-standard-decel) both;
}
.chip.chip-error { background: var(--md-error-container); color: var(--md-on-error-container); }
.chip.chip-info { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
@keyframes chip-in {
  from { opacity: 0; transform: scale(.85); }
  to { opacity: 1; transform: scale(1); }
}

/* --- Buttons --- */
.card-actions { display: flex; justify-content: flex-end; margin-top: 18px; }
.btn-filled {
  position: relative;
  overflow: hidden;
  border: none;
  background: var(--md-primary);
  color: var(--md-on-primary);
  font-weight: 600;
  font-size: 14.5px;
  padding: 0 24px;
  height: 44px;
  border-radius: var(--shape-full);
  cursor: pointer;
  box-shadow: var(--elev-1);
  transition: box-shadow var(--dur-short) var(--ease-standard), transform var(--dur-short) var(--ease-standard);
}
.btn-filled:hover { box-shadow: var(--elev-2); }
.btn-filled:active { transform: scale(.98); }
.btn-filled:disabled { opacity: .5; cursor: default; box-shadow: none; }

/* --- Spinner --- */
.spinner {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2.5px solid var(--md-primary-container);
  border-top-color: var(--md-primary);
  animation: spin 800ms linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* --- Ripple --- */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: currentColor;
  opacity: .22;
  transform: scale(0);
  animation: ripple-expand var(--dur-long) var(--ease-standard-decel);
  pointer-events: none;
}
@keyframes ripple-expand { to { transform: scale(1); opacity: 0; } }

/* --- Footer --- */
.footer { max-width: 920px; margin: 0 auto; padding: 8px 16px 40px; color: var(--md-on-surface-variant); font-size: 12.5px; }

/* --- Bottom sheet --- */
.sheet {
  position: fixed; inset: 0; z-index: 50;
  display: flex; align-items: flex-end; justify-content: center;
  pointer-events: none;
}
.sheet-panel {
  pointer-events: auto;
  width: 100%; max-width: 560px;
  max-height: min(78vh, 640px);
  background: var(--md-surface-container-low);
  border-radius: var(--shape-xl) var(--shape-xl) 0 0;
  box-shadow: var(--elev-3);
  display: flex; flex-direction: column;
  transform: translateY(100%);
  transition: transform var(--dur-long) var(--ease-emphasized);
}
.sheet[data-open] .sheet-panel { transform: translateY(0); }
.sheet-panel.dragging { transition: none; }
.sheet-handle {
  width: 100%; height: 44px;
  display: flex; align-items: center; justify-content: center;
  touch-action: none;
  cursor: grab;
}
.sheet-handle::after {
  content: '';
  width: 32px; height: 4px; border-radius: var(--shape-full);
  background: var(--md-outline-variant);
}
.sheet-head { display: flex; align-items: center; justify-content: space-between; padding: 4px 12px 4px 20px; }
.sheet-head h2 { font-size: 17px; }
.sheet-search-wrap { position: relative; padding: 4px 20px 12px; }
.sheet-search-icon { position: absolute; left: 34px; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--md-on-surface-variant); }
.sheet-search {
  width: 100%;
  height: 44px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--shape-full);
  background: var(--md-surface-container-lowest);
  color: var(--md-on-surface);
  padding: 0 16px 0 38px;
  font-size: 15px;
  font-family: inherit;
}
.sheet-search:focus-visible { outline: none; border-color: var(--md-primary); box-shadow: 0 0 0 1px var(--md-primary); }
.sheet-list { overflow-y: auto; padding: 0 8px 24px; }
.sheet-group-title {
  position: sticky; top: 0;
  background: var(--md-surface-container-low);
  font-size: 12px; font-weight: 700;
  color: var(--md-primary);
  padding: 12px 12px 6px;
}
.sheet-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 9px 12px;
  border-radius: var(--shape-md);
}
.sheet-row:hover { background: var(--md-surface-container-high); }
.sheet-row-kana { font-size: 16px; font-weight: 600; }
.sheet-row-nya { font-size: 14px; color: var(--md-primary); background: var(--md-primary-container); padding: 3px 10px; border-radius: var(--shape-full); }
.sheet-empty { padding: 24px 16px; text-align: center; color: var(--md-on-surface-variant); font-size: 14px; }

/* --- Snackbar --- */
.snackbar {
  position: fixed; left: 50%; bottom: 24px; z-index: 60;
  transform: translate(-50%, 16px);
  background: var(--md-inverse-surface);
  color: var(--md-inverse-on-surface);
  padding: 14px 20px;
  border-radius: var(--shape-sm);
  box-shadow: var(--elev-2);
  font-size: 14px;
  max-width: min(90vw, 480px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-medium) var(--ease-standard), transform var(--dur-medium) var(--ease-emphasized);
}
.snackbar[data-open] { opacity: 1; transform: translate(-50%, 0); }

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

/* --- Responsive: tablet / desktop side-by-side --- */
@media (min-width: 720px) {
  .panes { flex-direction: row; }
  .pane { flex: 1; min-width: 0; }
  textarea.field, .field-output { min-height: 220px; height: 100%; }
  .pane-source { padding-right: 20px; }
  .pane-target { padding-left: 20px; }
  .swap-wrap { padding: 0 4px; }
  .swap-wrap::before { left: 50%; right: auto; top: 0; bottom: 0; height: auto; width: 1px; }
}

@media (max-width: 400px) {
  .topbar-inner { padding: 10px 12px; }
  .main { padding: 8px 12px 32px; }
}

/* wins the specificity tie against component rules that set their own display */
[hidden] { display: none; }