:root {
  --bg: #eef5ed;
  --surface: #ffffff;
  --surface-2: #f7f7f7;
  --border: #dae2ef;
  --border-soft: #e9ecf3;
  --text: #2b2b2b;
  --text-muted: #6c6c6c;
  --accent: #4d99b7;
  --accent-hover: #2f7d9a;
  --heading: #8e6264;
  --heading-strong: #6f4749;
  --rule-dotted: #c0b0b1;
  --header-band: #e6e1e1;
  --danger: #cf3a3a;
  --good: #3f9d6b;
  --easy: #4d8fb7;
  --kana-input-text: #3d1e1e;
  --focus-ring: rgba(77, 153, 183, 0.45);
  --shadow: 0 1px 2px rgba(36, 40, 50, 0.04), 0 4px 14px rgba(36, 40, 50, 0.05);
  --radius: 6px;
  --radius-lg: 10px;
  --pad: clamp(0.9rem, 2.5vw, 1.6rem);
}

[data-theme="dark"] {
  --bg: #0f1216;
  --surface: #161a20;
  --surface-2: #1d2229;
  --border: #2a313c;
  --border-soft: #232931;
  --text: #e9ecf2;
  --text-muted: #9aa3b0;
  --accent: #7cc3df;
  --accent-hover: #a4d6ec;
  --heading: #e6b6b8;
  --heading-strong: #f0c8ca;
  --rule-dotted: #4a3a3b;
  --header-band: #1f2228;
  --danger: #ff6b6b;
  --good: #5fc78c;
  --easy: #7cc3df;
  --kana-input-text: #f3e6e6;
  --focus-ring: rgba(124, 195, 223, 0.5);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 18px rgba(0, 0, 0, 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1216;
    --surface: #161a20;
    --surface-2: #1d2229;
    --border: #2a313c;
    --border-soft: #232931;
    --text: #e9ecf2;
    --text-muted: #9aa3b0;
    --accent: #7cc3df;
    --accent-hover: #a4d6ec;
    --heading: #e6b6b8;
    --heading-strong: #f0c8ca;
    --rule-dotted: #4a3a3b;
    --header-band: #1f2228;
    --danger: #ff6b6b;
    --good: #5fc78c;
    --easy: #7cc3df;
    --kana-input-text: #f3e6e6;
    --focus-ring: rgba(124, 195, 223, 0.5);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 6px 18px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  background-color: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
  min-height: 100dvh;
  transition: background-color 0.2s ease, color 0.2s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
a:hover { color: var(--accent-hover); }
a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 3px;
}

.topbar {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(1rem, 4vw, 1.8rem) var(--pad) 0.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

h1 {
  text-align: left;
  color: var(--heading);
  font-size: clamp(1.6rem, 4.5vw, 2rem);
  letter-spacing: -0.01em;
  margin: 0;
}

.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}
.theme-toggle:hover { transform: translateY(-1px); }
.theme-toggle:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }

.theme-icon {
  width: 20px;
  height: 20px;
  background: currentColor;
  -webkit-mask: var(--icon, none) center / contain no-repeat;
          mask: var(--icon, none) center / contain no-repeat;
  display: block;
}
[data-theme="dark"] .theme-icon,
:root:not([data-theme="light"]) .theme-icon {
  --icon: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><circle cx='12' cy='12' r='5' fill='black'/><g stroke='black' stroke-width='2' stroke-linecap='round'><line x1='12' y1='1.5' x2='12' y2='4.5'/><line x1='12' y1='19.5' x2='12' y2='22.5'/><line x1='1.5' y1='12' x2='4.5' y2='12'/><line x1='19.5' y1='12' x2='22.5' y2='12'/><line x1='4.5' y1='4.5' x2='6.5' y2='6.5'/><line x1='17.5' y1='17.5' x2='19.5' y2='19.5'/><line x1='4.5' y1='19.5' x2='6.5' y2='17.5'/><line x1='17.5' y1='6.5' x2='19.5' y2='4.5'/></g></svg>");
}
[data-theme="light"] .theme-icon {
  --icon: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M21 12.79A9 9 0 1 1 11.21 3a7 7 0 0 0 9.79 9.79z' fill='black'/></svg>");
}
:root:not([data-theme]) .theme-icon {
  --icon: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M21 12.79A9 9 0 1 1 11.21 3a7 7 0 0 0 9.79 9.79z' fill='black'/></svg>");
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-icon {
    --icon: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><circle cx='12' cy='12' r='5' fill='black'/><g stroke='black' stroke-width='2' stroke-linecap='round'><line x1='12' y1='1.5' x2='12' y2='4.5'/><line x1='12' y1='19.5' x2='12' y2='22.5'/><line x1='1.5' y1='12' x2='4.5' y2='12'/><line x1='19.5' y1='12' x2='22.5' y2='12'/><line x1='4.5' y1='4.5' x2='6.5' y2='6.5'/><line x1='17.5' y1='17.5' x2='19.5' y2='19.5'/><line x1='4.5' y1='19.5' x2='6.5' y2='17.5'/><line x1='17.5' y1='6.5' x2='19.5' y2='4.5'/></g></svg>");
  }
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 var(--pad);
}

.card {
  background-color: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  margin: 1rem 0;
  overflow: hidden;
}

#quiz {
  padding: clamp(1.1rem, 3.5vw, 1.6rem) clamp(1rem, 4vw, 2rem);
}

#answer {
  text-align: center;
  margin-bottom: 0.3rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  min-height: 1.3em;
  visibility: hidden;
  letter-spacing: 0.04em;
}
#answer.show { visibility: visible; }

#kana-display {
  text-align: center;
  font-size: clamp(4rem, 18vw, 6rem);
  line-height: 1.1;
  padding: 0.2em 0;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  border-radius: var(--radius);
  outline: none;
}
#kana-display:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

#kana {
  display: inline-block;
  min-height: 1em;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "Meiryo", sans-serif;
}

.input-row {
  display: flex;
  justify-content: center;
  margin-top: 0.4rem;
}

#input-box {
  width: min(100%, 18rem);
  padding: 0.7rem 0.9rem;
  font-size: 1.05rem;
  text-align: center;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--kana-input-text);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
#input-box::placeholder { color: var(--text-muted); opacity: 0.7; }
#input-box:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

#message {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 1rem 0 0;
  min-height: 1.3em;
}
#wrong {
  color: var(--danger);
  font-weight: 600;
}
#message .hint {
  color: var(--text-muted);
  font-weight: 400;
  font-size: 0.85em;
}

.leech-badge {
  display: inline-block;
  margin: 0 auto;
  margin-top: 0.5rem;
  padding: 0.2rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--heading-strong);
  background: var(--header-band);
  border: 1px solid var(--rule-dotted);
  border-radius: 999px;
  text-align: center;
}
.leech-badge[hidden] { display: none; }
#quiz { text-align: center; }
#quiz .leech-badge { margin-top: 0.4rem; }

/* --- font picker --- */

.font-help {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: -0.4rem 0 0.7rem;
  line-height: 1.45;
}

.font-table .font-preview {
  font-size: 1.6rem;
  display: block;
  line-height: 1.2;
}
.font-table .font-label {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
  white-space: nowrap;
}

.font-preview[data-font="default"]   { font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif; }
.font-preview[data-font="noto-sans"] { font-family: "Noto Sans JP", sans-serif; }
.font-preview[data-font="noto-serif"]{ font-family: "Noto Serif JP", serif; }
.font-preview[data-font="zen-kaku"]  { font-family: "Zen Kaku Gothic New", sans-serif; }
.font-preview[data-font="kosugi-maru"] { font-family: "Kosugi Maru", sans-serif; }
.font-preview[data-font="shippori"]  { font-family: "Shippori Mincho", serif; }
.font-preview[data-font="hina"]      { font-family: "Hina Mincho", serif; }
.font-preview[data-font="klee"]      { font-family: "Klee One", cursive; }
.font-preview[data-font="yomogi"]    { font-family: "Yomogi", cursive; }
.font-preview[data-font="reggae"]    { font-family: "Reggae One", cursive; }
.font-preview[data-font="dotgothic"] { font-family: "DotGothic16", sans-serif; }
.font-preview[data-font="stick"]     { font-family: "Stick", sans-serif; }

/* Quiz kana font swap classes */
#kana[data-font="default"]   { font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif; }
#kana[data-font="noto-sans"] { font-family: "Noto Sans JP", sans-serif; }
#kana[data-font="noto-serif"]{ font-family: "Noto Serif JP", serif; }
#kana[data-font="zen-kaku"]  { font-family: "Zen Kaku Gothic New", sans-serif; }
#kana[data-font="kosugi-maru"] { font-family: "Kosugi Maru", sans-serif; }
#kana[data-font="shippori"]  { font-family: "Shippori Mincho", serif; }
#kana[data-font="hina"]      { font-family: "Hina Mincho", serif; }
#kana[data-font="klee"]      { font-family: "Klee One", cursive; }
#kana[data-font="yomogi"]    { font-family: "Yomogi", cursive; }
#kana[data-font="reggae"]    { font-family: "Reggae One", cursive; }
#kana[data-font="dotgothic"] { font-family: "DotGothic16", sans-serif; }
#kana[data-font="stick"]     { font-family: "Stick", sans-serif; }

.quiz-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.8rem;
  font-size: 0.85rem;
}

ul#tools {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.1rem;
}
ul#tools button {
  background: none;
  border: none;
  padding: 0.35rem 0;
  font: inherit;
  font-weight: 600;
  color: var(--accent);
  cursor: pointer;
  min-height: 32px;
}
ul#tools button:hover { color: var(--accent-hover); }
ul#tools button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 3px;
}
ul#tools button.hidden { visibility: hidden; }

#count {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

#options details,
#words-options details {
  margin: 0;
}

#options summary,
#words-options summary {
  list-style: none;
  cursor: pointer;
  background-color: var(--header-band);
  color: var(--heading);
  padding: 0.7rem 1rem;
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  user-select: none;
}
#options summary::-webkit-details-marker,
#words-options summary::-webkit-details-marker { display: none; }
#options summary::after,
#words-options summary::after {
  content: "";
  width: 10px; height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.15s ease;
  margin-left: auto;
  margin-right: 0.2rem;
  opacity: 0.6;
}
#options details[open] summary::after,
#words-options details[open] summary::after { transform: rotate(-135deg); }
#options summary .hint,
#words-options summary .hint {
  font-size: 0.75rem;
  font-weight: 600;
  opacity: 0.65;
  margin-left: auto;
  padding-left: 0.5rem;
}

.options-body {
  padding: 0.5rem clamp(1rem, 4vw, 1.4rem) clamp(1rem, 4vw, 1.4rem);
}

h3 {
  color: var(--heading-strong);
  border-bottom: 1px dotted var(--rule-dotted);
  padding: 0 0.3rem 0.5rem;
  margin: 1.6rem 0 0.8rem;
  font-size: 1rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.rowtools {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}
.rowtools button {
  background: none;
  border: none;
  padding: 0.25rem 0.2rem;
  font: inherit;
  color: var(--accent);
  cursor: pointer;
  font-weight: 600;
}
.rowtools button:hover { color: var(--accent-hover); }
.rowtools .sep { opacity: 0.5; padding: 0 0.15rem; }

.grid-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 calc(-1 * var(--pad));
  padding: 0 var(--pad);
}

.kana-table {
  border-collapse: collapse;
  border: 1px solid var(--border);
  width: 100%;
  background: var(--surface);
}

.kana-table td {
  border: 1px solid var(--border);
  text-align: center;
  padding: 0.35rem 0.4rem;
  vertical-align: middle;
}

.kana-table .checkrow {
  background-color: var(--surface-2);
}

.kana-table .kana {
  font-size: 1.25rem;
  display: block;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "Meiryo", sans-serif;
}
.kana-table .romaji {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

.kanacheck {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--accent);
}

.prose {
  line-height: 1.65;
  color: var(--text);
  font-size: 0.95rem;
}
.prose p { margin: 0.7rem 0; }
.prose strong { color: var(--heading-strong); }
.prose em { font-style: normal; color: var(--accent); font-weight: 600; }
.kbd-hint kbd {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05em 0.4em;
  font: 600 0.85em ui-monospace, SFMono-Regular, Menlo, monospace;
  background: var(--surface-2);
  color: var(--text);
  margin: 0 0.1em;
}

.site-footer {
  max-width: 760px;
  margin: 1rem auto 2rem;
  padding: 0 var(--pad);
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ---- mobile tuning ---- */

@media (max-width: 720px) {
  .kana-table { font-size: 0.9rem; min-width: 560px; }
  .kana-table td { padding: 0.3rem 0.3rem; }
  .kana-table .kana { font-size: 1.15rem; }
  .kana-table .romaji { font-size: 0.7rem; }
}

@media (max-width: 480px) {
  h3 { font-size: 0.95rem; }
  .rowtools { font-size: 0.75rem; }
  .quiz-footer { font-size: 0.8rem; }
  ul#tools { gap: 0.2rem 0.9rem; }
  ul#tools button { font-size: 0.85rem; }
  #input-box { width: 100%; }
  .kanacheck { width: 20px; height: 20px; } /* larger tap target */
  .topbar { padding-top: 1rem; }
}

@media (hover: none) {
  /* on touch devices, the romaji reveal is via tap not hover */
  #kana-display { -webkit-tap-highlight-color: transparent; }
}

/* --- stroke order modal --- */

/* Native <dialog>: browser handles focus trap, Esc, backdrop click via form method="dialog". */
.stroke-modal {
  border: none;
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 0;
  width: min(440px, 92vw);
  max-width: 92vw;
  max-height: 92dvh;
}
.stroke-modal::backdrop {
  background: rgba(15, 18, 22, 0.55);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}

.stroke-modal-card {
  margin: 0;
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.2rem 1rem;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.stroke-modal-close {
  position: absolute;
  top: 0.35rem;
  right: 0.4rem;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0;
}
.stroke-modal-close:hover { color: var(--text); background: var(--surface-2); }
.stroke-modal-close:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.stroke-modal-title {
  margin: 0;
  padding-right: 2.4rem;
  text-align: center;
  font-size: 1rem;
  color: var(--heading-strong);
  font-weight: 700;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.5rem;
}
#stroke-modal-char {
  font-size: 1.8rem;
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  color: var(--text);
  line-height: 1;
}
.stroke-modal-romaji {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: lowercase;
}

.stroke-modal-note {
  margin: -0.3rem 0 0;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}
.stroke-modal-note .accent {
  color: var(--heading-strong);
  font-weight: 600;
}

.stroke-modal-frame {
  background: #ffffff;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0.5rem;
  min-height: 260px;
  border: 1px solid var(--border);
}
#stroke-modal-img {
  max-width: 100%;
  max-height: 58vh;
  display: block;
}

.stroke-modal-status {
  font-size: 0.9rem;
  color: #6c6c6c;
  text-align: center;
  padding: 1rem;
}
.stroke-modal-status a {
  color: var(--accent);
  font-weight: 600;
}

.stroke-modal-source {
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}
.stroke-modal-source:hover { color: var(--accent-hover); }

@media (max-width: 480px) {
  .stroke-modal-card { padding: 0.9rem 1rem 0.8rem; }
  .stroke-modal-frame { min-height: 220px; }
}

.stroke-modal-playbtn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.95rem;
  font: inherit;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  cursor: pointer;
}
.stroke-modal-playbtn:hover { border-color: var(--accent); color: var(--accent); }
.stroke-modal-playbtn:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  .stroke-modal::backdrop { backdrop-filter: none; -webkit-backdrop-filter: none; }
}

/* ===================== Words mode ===================== */

.mode-tabs {
  max-width: 760px;
  margin: 0.6rem auto 0;
  padding: 0 var(--pad);
  display: flex;
  gap: 0.4rem;
}
.mode-tab {
  flex: 1;
  padding: 0.6rem 0.9rem;
  font: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 0.15s ease, background 0.2s ease, border-color 0.2s ease;
}
.mode-tab.is-active {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
}
[data-theme="dark"] .mode-tab.is-active,
:root:not([data-theme="light"]) .mode-tab.is-active { color: #0f1216; }
.mode-tab:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }

.mode-panel[hidden] { display: none; }

/* login */
#words-login { padding: clamp(1.4rem, 5vw, 2.4rem) clamp(1rem, 4vw, 2rem); }
.login-box { max-width: 26rem; margin: 0 auto; text-align: center; }
.login-title { color: var(--heading); margin: 0 0 0.4rem; font-size: 1.4rem; }
.login-sub { color: var(--text-muted); font-size: 0.92rem; margin: 0 0 1.2rem; line-height: 1.5; }
.login-row { display: flex; gap: 0.5rem; }
#login-name {
  flex: 1;
  padding: 0.7rem 0.9rem;
  font-size: 1.05rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius);
}
#login-name:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--focus-ring); }
.login-btn {
  padding: 0.7rem 1.3rem;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  cursor: pointer;
}
[data-theme="dark"] .login-btn,
:root:not([data-theme="light"]) .login-btn { color: #0f1216; }
.login-btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.login-btn:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
.login-msg { color: var(--danger); font-size: 0.85rem; min-height: 1.2em; margin: 0.6rem 0 0; }

/* signed-in bar */
.words-user {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.6rem clamp(1rem, 4vw, 1.4rem);
  background: var(--header-band);
  color: var(--heading);
  font-size: 0.85rem;
}
.words-user[hidden] { display: none; }
.words-user-right { display: inline-flex; align-items: center; gap: 0.8rem; }
.sync-status { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; }
.sync-status[data-kind="ok"] { color: var(--good); }
.sync-status[data-kind="warn"] { color: var(--heading-strong); }
.sync-status[data-kind="busy"] { color: var(--accent); }
.words-signout {
  background: none; border: none; padding: 0.2rem 0;
  font: inherit; font-weight: 600; color: var(--accent); cursor: pointer;
}
.words-signout:hover { color: var(--accent-hover); }
.words-signout:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; border-radius: 3px; }

/* flashcard */
#flashcard { padding: clamp(1.1rem, 3.5vw, 1.6rem) clamp(1rem, 4vw, 2rem); text-align: center; }
#flashcard[hidden], #words-options[hidden], #words-login[hidden] { display: none; }

.fc-badges { display: flex; justify-content: center; gap: 0.4rem; min-height: 1.5em; flex-wrap: wrap; }
.badge {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
  padding: 0.15rem 0.55rem; border-radius: 999px;
  background: var(--header-band); color: var(--heading-strong); border: 1px solid var(--rule-dotted);
}

.fc-display {
  cursor: pointer; user-select: none; -webkit-user-select: none;
  border-radius: var(--radius); outline: none; padding: 0.6rem 0;
}
.fc-display:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
.fc-word {
  font-size: clamp(2.6rem, 11vw, 4rem); line-height: 1.15; color: var(--text);
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", "Meiryo", sans-serif; word-break: keep-all;
}
.fc-back { margin-top: 0.4rem; }
.fc-back[hidden] { display: none; }
.fc-reading {
  font-size: clamp(1.3rem, 5vw, 1.8rem); color: var(--heading);
  font-family: "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
}
.fc-romaji { font-size: 0.95rem; color: var(--text-muted); letter-spacing: 0.04em; margin-top: 0.1rem; }
.fc-meaning { font-size: 1.15rem; color: var(--text); margin-top: 0.55rem; font-weight: 600; }
.fc-hint { font-size: 0.85rem; color: var(--text-muted); margin: 0.7rem 0 0; min-height: 1.2em; }
.fc-hint[hidden] { display: none; }

.fc-grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.5rem; margin-top: 1rem; }
.fc-grades[hidden] { display: none; }
.grade-btn {
  display: flex; flex-direction: column; align-items: center; gap: 0.1rem;
  padding: 0.55rem 0.3rem; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text); cursor: pointer; font: inherit; min-height: 52px;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
}
.grade-btn:hover { transform: translateY(-1px); }
.grade-btn:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
.grade-label { font-weight: 700; font-size: 0.9rem; }
.grade-when { font-size: 0.7rem; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.grade-again { border-color: color-mix(in srgb, var(--danger) 45%, var(--border)); }
.grade-again .grade-label { color: var(--danger); }
.grade-good  { border-color: color-mix(in srgb, var(--good) 45%, var(--border)); }
.grade-good  .grade-label { color: var(--good); }
.grade-easy  { border-color: color-mix(in srgb, var(--easy) 45%, var(--border)); }
.grade-easy  .grade-label { color: var(--easy); }

.fc-count { color: var(--text-muted); font-variant-numeric: tabular-nums; font-weight: 600; font-size: 0.85rem; }
ul#fc-tools { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.2rem 1.1rem; }
ul#fc-tools button { background: none; border: none; padding: 0.35rem 0; font: inherit; font-weight: 600; color: var(--accent); cursor: pointer; min-height: 32px; }
ul#fc-tools button:hover { color: var(--accent-hover); }
ul#fc-tools button:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; border-radius: 3px; }

/* filter chips */
.filter-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.35rem 0.7rem; border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); cursor: pointer; font-size: 0.88rem; user-select: none;
}
.chip input { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; margin: 0; }
.chip:has(input:checked) { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, var(--surface)); }

@media (max-width: 480px) {
  .grade-label { font-size: 0.82rem; }
  .grade-when { font-size: 0.62rem; }
  .fc-grades { gap: 0.35rem; }
  .login-row { flex-direction: column; }
}

/* ============================================================
   KANJI MODE
   All selectors scoped to #kanji-mode or kj- prefixed to avoid
   collision with the kana/words panels' styles.
   ============================================================ */

#kanji-mode {
  --on-color: #b04646;
  --kun-color: #2f6ea3;
}
[data-theme="dark"] #kanji-mode,
:root:not([data-theme="light"]) #kanji-mode {
  --on-color: #ff8c8c;
  --kun-color: #7fb8e8;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) #kanji-mode {
    --on-color: #ff8c8c;
    --kun-color: #7fb8e8;
  }
}

#kj-quiz {
  padding: clamp(1rem, 3vw, 1.4rem) clamp(1rem, 4vw, 1.8rem) clamp(0.9rem, 3vw, 1.3rem);
  text-align: center;
}

.kj-mode-switcher {
  display: inline-flex;
  background: var(--surface-2);
  border-radius: 999px;
  padding: 4px;
  margin: 0 auto 1rem;
  border: 1px solid var(--border);
}
.kj-mode-tab {
  background: none;
  border: none;
  padding: 0.4rem 1rem;
  font: 600 0.85rem inherit;
  color: var(--text-muted);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
  min-width: 80px;
}
.kj-mode-tab:hover { color: var(--text); }
.kj-mode-tab.active {
  background: var(--surface);
  color: var(--heading-strong);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.kj-mode-tab:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }

.kj-prompt-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
  text-transform: lowercase;
  letter-spacing: 0.02em;
}

.kj-kanji-display {
  font-size: clamp(5rem, 22vw, 8rem);
  line-height: 1.05;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  border-radius: var(--radius);
  outline: none;
  padding: 0.05em 0;
}
.kj-kanji-display:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; }
#kj-kanji {
  font-family: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-weight: 400;
  display: inline-block;
}

.kj-answer {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0.2rem 0 0.3rem;
  min-height: 1.5em;
  visibility: hidden;
  line-height: 1.45;
}
.kj-answer.show { visibility: visible; }

.kj-answer .ans-on,
.kj-answer .ans-kun {
  display: inline-block;
  margin: 0 0.4rem;
}
.kj-answer .ans-on  { color: var(--on-color);  font-family: "Noto Sans JP", sans-serif; }
.kj-answer .ans-kun { color: var(--kun-color); font-family: "Noto Sans JP", sans-serif; }
.kj-answer .ans-on .label,
.kj-answer .ans-kun .label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  opacity: 0.65;
  margin-right: 0.3em;
}
.kj-answer .ans-meanings {
  display: block;
  color: var(--text);
  font-size: 1rem;
  font-weight: 500;
  margin-top: 0.15rem;
}

#kj-input-box {
  width: min(100%, 18rem);
  padding: 0.7rem 0.9rem;
  font-size: 1.05rem;
  text-align: center;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--input-text, var(--text));
  border-radius: var(--radius);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
#kj-input-box::placeholder { color: var(--text-muted); opacity: 0.6; }
#kj-input-box:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.kj-message {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin: 0.9rem 0 0;
  min-height: 1.3em;
}
#kj-wrong { color: var(--danger); font-weight: 600; }
.kj-message .hint { color: var(--text-muted); font-weight: 400; font-size: 0.85em; }

.kj-tools {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 0.2rem 1.1rem;
}
.kj-tools button {
  background: none; border: none;
  padding: 0.35rem 0;
  font: 600 inherit;
  color: var(--accent);
  cursor: pointer;
  min-height: 32px;
}
.kj-tools button:hover { color: var(--accent-hover); }
.kj-tools button:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 2px; border-radius: 3px; }

.kj-count {
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.kj-details-panel {
  margin-top: 0.8rem;
  padding: 0.7rem 0.9rem;
  background: var(--surface-2);
  border: 1px solid var(--border-soft, var(--border));
  border-radius: var(--radius);
  font-size: 0.85rem;
  text-align: left;
}
.kj-details-panel[hidden] { display: none; }
.kj-details-panel dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 0.2rem 0.8rem; }
.kj-details-panel dt { color: var(--text-muted); font-weight: 600; }
.kj-details-panel dd { margin: 0; color: var(--text); }
.kj-details-panel .reading-on  { color: var(--on-color); font-family: "Noto Sans JP", sans-serif; }
.kj-details-panel .reading-kun { color: var(--kun-color); font-family: "Noto Sans JP", sans-serif; }
.kj-details-panel .reading-romaji { opacity: 0.6; }

.kj-filter-help {
  font-size: 0.83rem;
  color: var(--text-muted);
  margin: 0 0 0.6rem;
  line-height: 1.45;
}

.kj-filter-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.5rem;
}

.kj-filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  min-height: 36px;
  user-select: none;
}
.kj-filter-chip:hover { border-color: var(--accent); }
.kj-filter-chip input { margin: 0; accent-color: var(--accent); }
.kj-filter-chip span { line-height: 1; display: inline-flex; align-items: center; gap: 0.4em; }
.kj-filter-chip em { font-style: normal; color: var(--text-muted); font-size: 0.85em; }
.kj-filter-chip:has(input:checked) {
  background: color-mix(in srgb, var(--accent) 12%, var(--surface));
  border-color: var(--accent);
  color: var(--heading-strong);
}

.kj-danger-btn {
  background: none;
  border: 1px solid var(--rule-dotted, var(--border));
  color: var(--danger);
  border-radius: var(--radius);
  padding: 0.5rem 0.9rem;
  font: 600 0.9rem inherit;
  cursor: pointer;
}
.kj-danger-btn:hover { background: color-mix(in srgb, var(--danger) 8%, transparent); }

@media (max-width: 480px) {
  .kj-mode-tab { padding: 0.45rem 0.8rem; min-width: 70px; font-size: 0.85rem; }
  .kj-filter-chip { padding: 0.5rem 0.75rem; font-size: 0.85rem; }
}
@media (hover: none) {
  .kj-kanji-display { -webkit-tap-highlight-color: transparent; }
}