/* ===== Kanji Catalog ===== */
:root {
  --bg: #f7f4ee;
  --bg-soft: #efe9df;
  --card: #fffdf8;
  --card-hover: #fffbf2;
  --ink: #1c1a17;
  --ink-soft: #55504a;
  --ink-faint: #8a837a;
  --line: #e3dccf;
  --line-strong: #d3c9b6;
  --accent: #c8102e;         /* hanko vermilion */
  --accent-soft: #f4d7db;
  --stroke-done: #26221e;
  --stroke-pending: #d9d1c2;
  --stroke-current: #c8102e;
  --grid: #ece5d8;
  --n5:#2e7d32; --n4:#0277bd; --n3:#6a1b9a; --n2:#e65100; --n1:#b71c1c;
  --shadow: 0 1px 2px rgba(40,34,24,.06), 0 6px 20px rgba(40,34,24,.06);
  --radius: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-jp: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", "Noto Serif JP", "Hiragino Kaku Gothic ProN", serif;
}
[data-theme="dark"] {
  --bg: #17150f;
  --bg-soft: #1f1c15;
  --card: #221f18;
  --card-hover: #2a261d;
  --ink: #f2ece0;
  --ink-soft: #c3bcac;
  --ink-faint: #8f887a;
  --line: #322d23;
  --line-strong: #423b2d;
  --accent: #ff5a6a;
  --accent-soft: #3a2226;
  --stroke-done: #f2ece0;
  --stroke-pending: #4a4335;
  --stroke-current: #ff5a6a;
  --grid: #2a251c;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; }
a { color: var(--accent); text-decoration: none; }

/* ---- Header ---- */
.header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  max-width: 1180px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand .logo {
  font-family: var(--font-jp); font-weight: 700; font-size: 30px;
  color: #fff; background: var(--accent); width: 46px; height: 46px;
  display: grid; place-items: center; border-radius: 12px;
  box-shadow: var(--shadow); line-height: 1;
}
.brand h1 { font-size: 19px; margin: 0; letter-spacing: .3px; }
.brand p { margin: 0; font-size: 12px; color: var(--ink-faint); }

.search-wrap { flex: 1; min-width: 240px; position: relative; }
.search-wrap svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--ink-faint); }
#search {
  width: 100%; padding: 12px 40px 12px 42px; font-size: 15px;
  border: 1px solid var(--line-strong); border-radius: 12px;
  background: var(--card); color: var(--ink); outline: none;
  transition: border-color .15s, box-shadow .15s;
}
#search:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search-clear {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  border: none; background: transparent; color: var(--ink-faint);
  font-size: 18px; width: 28px; height: 28px; border-radius: 8px; display: none;
}
.search-clear:hover { background: var(--bg-soft); }

.theme-btn {
  border: 1px solid var(--line-strong); background: var(--card); color: var(--ink);
  width: 42px; height: 42px; border-radius: 12px; font-size: 18px; display: grid; place-items: center;
}
.theme-btn:hover { background: var(--card-hover); }

/* ---- Toolbar ---- */
.toolbar {
  max-width: 1180px; margin: 0 auto; padding: 14px 20px 0;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.levels { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--line-strong); background: var(--card); color: var(--ink-soft);
  padding: 7px 14px; border-radius: 999px; font-size: 13px; font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px; transition: all .12s;
}
.chip:hover { background: var(--card-hover); }
.chip .count { color: var(--ink-faint); font-weight: 500; font-size: 12px; }
.chip.active { color: #fff; border-color: transparent; }
.chip.active .count { color: rgba(255,255,255,.8); }
.chip[data-lvl="all"].active { background: var(--ink); }
.chip[data-lvl="N5"].active { background: var(--n5); }
.chip[data-lvl="N4"].active { background: var(--n4); }
.chip[data-lvl="N3"].active { background: var(--n3); }
.chip[data-lvl="N2"].active { background: var(--n2); }
.chip[data-lvl="N1"].active { background: var(--n1); }
.chip .dot { width: 8px; height: 8px; border-radius: 50%; }
.chip[data-lvl="N5"] .dot { background: var(--n5); }
.chip[data-lvl="N4"] .dot { background: var(--n4); }
.chip[data-lvl="N3"] .dot { background: var(--n3); }
.chip[data-lvl="N2"] .dot { background: var(--n2); }
.chip[data-lvl="N1"] .dot { background: var(--n1); }

.spacer { flex: 1; }
.sort-select {
  border: 1px solid var(--line-strong); background: var(--card); color: var(--ink);
  padding: 8px 12px; border-radius: 10px; font-size: 13px;
}
.result-count { color: var(--ink-faint); font-size: 13px; padding: 4px 20px 0; max-width: 1180px; margin: 0 auto; }

/* ---- Grid ---- */
.grid {
  max-width: 1180px; margin: 10px auto 60px; padding: 12px 20px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: 12px;
}
.kcard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 12px 8px 10px; text-align: center; cursor: pointer;
  transition: transform .12s, box-shadow .12s, border-color .12s, background .12s;
  position: relative; overflow: hidden;
}
.kcard:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--line-strong); background: var(--card-hover); }
.kcard .char { font-family: var(--font-jp); font-size: 46px; line-height: 1.15; color: var(--ink); }
.kcard .meaning { font-size: 11.5px; color: var(--ink-soft); margin-top: 4px; height: 2.6em; overflow: hidden;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.kcard .lvl-tag { position: absolute; top: 8px; left: 8px; font-size: 9.5px; font-weight: 700; color:#fff; padding: 2px 6px; border-radius: 6px; letter-spacing: .3px; }
.lvl-N5 { background: var(--n5);} .lvl-N4 { background: var(--n4);} .lvl-N3 { background: var(--n3);} .lvl-N2 { background: var(--n2);} .lvl-N1 { background: var(--n1);}

.empty { text-align: center; color: var(--ink-faint); padding: 80px 20px; grid-column: 1/-1; }
.empty .big { font-size: 40px; margin-bottom: 8px; }

/* ---- Detail modal ---- */
.overlay {
  position: fixed; inset: 0; z-index: 100; background: rgba(20,16,10,.45);
  display: none; align-items: flex-start; justify-content: center; padding: 30px 16px; overflow-y: auto;
  backdrop-filter: blur(2px);
}
.overlay.open { display: flex; }
.detail {
  background: var(--bg); border: 1px solid var(--line-strong); border-radius: 20px;
  width: 100%; max-width: 900px; box-shadow: 0 20px 60px rgba(0,0,0,.35); overflow: hidden;
  animation: pop .18s ease;
}
@keyframes pop { from { transform: translateY(8px) scale(.98); opacity: 0; } to { transform: none; opacity: 1; } }
.detail-head { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.detail-head .crumbs { font-size: 13px; color: var(--ink-faint); }
.close-btn { border: none; background: var(--bg-soft); color: var(--ink); width: 34px; height: 34px; border-radius: 10px; font-size: 18px; }
.close-btn:hover { background: var(--line); }

.detail-body { display: grid; grid-template-columns: 340px 1fr; gap: 0; }
@media (max-width: 760px) { .detail-body { grid-template-columns: 1fr; } }

.stroke-pane { padding: 22px; border-right: 1px solid var(--line); }
@media (max-width: 760px) { .stroke-pane { border-right: none; border-bottom: 1px solid var(--line); } }
.stroke-stage { position: relative; width: 100%; max-width: 296px; margin: 0 auto; aspect-ratio: 1; }
.stroke-stage svg { width: 100%; height: 100%; display: block; background: var(--card); border-radius: 14px; border: 1px solid var(--line); }
.guide { stroke: var(--grid); stroke-width: 1; stroke-dasharray: 4 5; }
.stroke-path { fill: none; stroke-linecap: round; stroke-linejoin: round; stroke-width: 4.2; }
.snum { fill: var(--accent); font-size: 8px; font-weight: 700; font-family: var(--font); }

.controls { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 14px; flex-wrap: wrap; }
.ctrl {
  border: 1px solid var(--line-strong); background: var(--card); color: var(--ink);
  height: 38px; padding: 0 12px; border-radius: 10px; font-size: 13px; font-weight: 600; display: inline-flex; align-items: center; gap: 6px;
}
.ctrl:hover { background: var(--card-hover); }
.ctrl.primary { background: var(--accent); color: #fff; border-color: transparent; }
.ctrl.primary:hover { filter: brightness(1.05); }
.ctrl.icon { width: 38px; padding: 0; justify-content: center; }
.ctrl:disabled { opacity: .4; cursor: default; }
.speed-row { display: flex; align-items: center; justify-content: center; gap: 10px; margin-top: 10px; font-size: 12px; color: var(--ink-faint); }
.speed-row input { accent-color: var(--accent); }
.toggle-row { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 8px; font-size: 12px; color: var(--ink-soft); }
.toggle-row label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }

.info-pane { padding: 22px 24px; }
.big-char { font-family: var(--font-jp); font-size: 58px; line-height: 1; }
.head-row { display: flex; align-items: center; gap: 14px; margin-bottom: 4px; }
.badges { display: flex; gap: 6px; flex-wrap: wrap; }
.badge { font-size: 11px; font-weight: 700; color: #fff; padding: 3px 9px; border-radius: 7px; }

.section { margin-top: 18px; }
.section h3 { font-size: 12px; letter-spacing: .8px; text-transform: uppercase; color: var(--ink-faint); margin: 0 0 8px; font-weight: 700; }
.readings { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) { .readings { grid-template-columns: 1fr; } }
.reading-block { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.reading-block .label { font-size: 11px; color: var(--ink-faint); font-weight: 700; margin-bottom: 6px; }
.reading-block .label .en { color: var(--ink-faint); font-weight: 500; }
.kana-list { display: flex; flex-wrap: wrap; gap: 6px; }
.kana-item { background: var(--bg-soft); border-radius: 8px; padding: 4px 9px; font-size: 15px; font-family: var(--font-jp); }
.kana-item .rj { font-size: 11px; color: var(--ink-faint); font-family: var(--font); margin-left: 4px; }
.none { color: var(--ink-faint); font-size: 13px; font-style: italic; }

.meanings { font-size: 16px; color: var(--ink); }

.stat-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
@media (max-width: 480px) { .stat-grid { grid-template-columns: repeat(2,1fr); } }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px; text-align: center; }
.stat .v { font-size: 22px; font-weight: 700; }
.stat .k { font-size: 11px; color: var(--ink-faint); margin-top: 2px; }
.freq-bar { height: 6px; background: var(--bg-soft); border-radius: 3px; margin-top: 8px; overflow: hidden; }
.freq-bar > span { display: block; height: 100%; background: var(--accent); border-radius: 3px; }

.comp-list { display: flex; flex-wrap: wrap; gap: 10px; }
.comp {
  display: flex; align-items: center; gap: 10px; background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 8px 12px 8px 8px; transition: all .12s; cursor: default;
}
.comp.link { cursor: pointer; }
.comp.link:hover { border-color: var(--accent); background: var(--card-hover); }
.comp .cc { font-family: var(--font-jp); font-size: 30px; line-height: 1; }
.comp .cinfo .cm { font-size: 12.5px; color: var(--ink); font-weight: 600; }
.comp .cinfo .cp { font-size: 11px; color: var(--ink-faint); }

.usedin { display: flex; flex-wrap: wrap; gap: 6px; }
.usedin .u { font-family: var(--font-jp); font-size: 24px; background: var(--card); border: 1px solid var(--line); border-radius: 10px; width: 44px; height: 44px; display: grid; place-items: center; cursor: pointer; transition: all .12s; }
.usedin .u:hover { border-color: var(--accent); transform: translateY(-2px); }

.footer { text-align: center; color: var(--ink-faint); font-size: 12px; padding: 30px 20px 50px; line-height: 1.7; }
.footer a { color: var(--ink-soft); }

/* loading */
.loading { text-align:center; padding: 80px; color: var(--ink-faint); }
.spinner { width: 30px; height: 30px; border: 3px solid var(--line); border-top-color: var(--accent); border-radius: 50%; margin: 0 auto 14px; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.hint-kbd { font-size: 11px; color: var(--ink-faint); border: 1px solid var(--line); border-radius: 5px; padding: 1px 5px; background: var(--card); }

/* ---- Radical ---- */
.radical-box { display: inline-flex; align-items: center; gap: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 16px 10px 12px; }
.radical-box.link { cursor: pointer; transition: all .12s; }
.radical-box.link:hover { border-color: var(--accent); background: var(--card-hover); }
.rad-char { font-family: var(--font-jp); font-size: 40px; line-height: 1; color: var(--accent); }
.rad-info .rad-name { font-size: 16px; font-weight: 700; color: var(--ink); text-transform: capitalize; }
.rad-info .rad-sub { font-size: 12px; color: var(--ink-faint); margin-top: 2px; }
.rad-info .rad-form { color: var(--ink-soft); }
.rad-badge { font-family: var(--font-jp); font-size: 10px; background: var(--accent-soft); color: var(--accent); border-radius: 6px; padding: 2px 5px; align-self: flex-start; margin-left: 2px; font-weight: 700; }
[data-theme="dark"] .rad-badge { color: var(--accent); }

/* ---- Example sentences ---- */
.examples { display: flex; flex-direction: column; gap: 10px; }
.ex { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; border-left: 3px solid var(--accent); }
.ex-j { font-family: var(--font-jp); font-size: 17px; color: var(--ink); line-height: 1.7; }
.ex-j mark { background: var(--accent-soft); color: var(--accent); border-radius: 4px; padding: 0 2px; font-weight: 700; }
.ex-e { font-size: 13.5px; color: var(--ink-soft); margin-top: 5px; }

/* ---- Appears in (with meanings) ---- */
.usedin { display: flex; flex-wrap: wrap; gap: 8px; }
.usedin .u { display: flex; align-items: center; gap: 8px; width: auto; height: auto; background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 6px 11px 6px 8px; cursor: pointer; transition: all .12s; }
.usedin .u:hover { border-color: var(--accent); transform: translateY(-2px); background: var(--card-hover); }
.usedin .uc { font-family: var(--font-jp); font-size: 24px; line-height: 1; color: var(--ink); }
.usedin .um { font-size: 12px; color: var(--ink-soft); max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.usedin .u-more { align-self: center; color: var(--ink-faint); font-size: 12px; padding: 0 6px; }

/* ---- Mode toggle (Search / By radical) ---- */
.mode-toggle { display: inline-flex; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; padding: 3px; gap: 2px; }
.mode-btn { border: none; background: transparent; color: var(--ink-soft); font-size: 13px; font-weight: 600; padding: 6px 12px; border-radius: 8px; }
.mode-btn:hover { color: var(--ink); }
.mode-btn.active { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

/* ---- Radical picker panel ---- */
.radical-panel { max-width: 1180px; margin: 12px auto 0; padding: 0 20px; }
.rp-head { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; font-size: 14px; color: var(--ink-soft); }
.rp-head b { font-family: var(--font-jp); color: var(--accent); font-size: 18px; }
.rp-clear { border: 1px solid var(--line-strong); background: var(--card); color: var(--ink-soft); font-size: 12px; padding: 5px 10px; border-radius: 8px; }
.rp-clear:hover { background: var(--card-hover); color: var(--ink); }
.rp-groups { display: flex; flex-direction: column; gap: 10px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; max-height: 340px; overflow-y: auto; }
.rp-group { display: grid; grid-template-columns: 74px 1fr; gap: 10px; align-items: start; }
.rp-glabel { font-size: 11px; color: var(--ink-faint); font-weight: 700; text-transform: uppercase; letter-spacing: .5px; padding-top: 8px; position: sticky; }
.rp-rads { display: flex; flex-wrap: wrap; gap: 6px; }
.rp-rad { position: relative; border: 1px solid var(--line); background: var(--bg-soft); border-radius: 9px; width: 42px; height: 44px; display: flex; flex-direction: column; align-items: center; justify-content: center; transition: all .1s; }
.rp-rad:hover { border-color: var(--accent); transform: translateY(-2px); background: var(--card-hover); }
.rp-rad.sel { background: var(--accent); border-color: var(--accent); }
.rp-rad .rp-c { font-family: var(--font-jp); font-size: 21px; line-height: 1; color: var(--ink); }
.rp-rad.sel .rp-c { color: #fff; }
.rp-rad .rp-n { font-size: 9px; color: var(--ink-faint); margin-top: 1px; }
.rp-rad.sel .rp-n { color: rgba(255,255,255,.85); }
.rp-groups::-webkit-scrollbar { width: 10px; }
.rp-groups::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 6px; border: 3px solid var(--card); }

/* ---- Top-level tabs ---- */
.tabs { max-width: 1180px; margin: 0 auto; padding: 0 20px; display: flex; gap: 4px; }
.tab { border: none; background: transparent; color: var(--ink-soft); font-size: 14px; font-weight: 600; padding: 10px 16px; border-bottom: 2.5px solid transparent; margin-bottom: -1px; }
.tab:hover { color: var(--ink); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ---- Flashcards ---- */
#view-flash { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
.fc-panel { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px 28px; max-width: 720px; margin: 26px auto; box-shadow: var(--shadow); }
.fc-panel.fc-center { text-align: center; }
.fc-title { font-size: 24px; margin: 0 0 4px; }
.fc-sub { color: var(--ink-soft); margin: 0 0 22px; font-size: 14px; }
.fc-field { margin-bottom: 18px; }
.fc-field > label { display: block; font-size: 12px; font-weight: 700; letter-spacing: .5px; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 8px; }
.fc-field .fc-hint { text-transform: none; letter-spacing: 0; font-weight: 500; color: var(--ink-faint); }
.fc-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 560px) { .fc-grid2 { grid-template-columns: 1fr; } }

.fc-levels { display: flex; gap: 8px; flex-wrap: wrap; }
.fc-lvl { flex: 1; min-width: 74px; border: 1.5px solid var(--line-strong); background: var(--bg-soft); border-radius: 12px; padding: 10px 8px; display: flex; flex-direction: column; align-items: center; gap: 2px; transition: all .12s; }
.fc-lvl b { font-size: 16px; color: var(--ink); }
.fc-lvl .fc-lc { font-size: 11px; color: var(--ink-faint); }
.fc-lvl:hover { border-color: var(--ink-faint); }
.fc-lvl.on { border-color: transparent; color: #fff; }
.fc-lvl.on b, .fc-lvl.on .fc-lc { color: #fff; }
.fc-lvl.on .fc-lc { opacity: .85; }
.fc-lvl[data-lvl="N5"].on { background: var(--n5); }
.fc-lvl[data-lvl="N4"].on { background: var(--n4); }
.fc-lvl[data-lvl="N3"].on { background: var(--n3); }
.fc-lvl[data-lvl="N2"].on { background: var(--n2); }
.fc-lvl[data-lvl="N1"].on { background: var(--n1); }

.seg { display: inline-flex; flex-wrap: wrap; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 11px; padding: 3px; gap: 2px; }
.seg-btn { border: none; background: transparent; color: var(--ink-soft); font-size: 13px; font-weight: 600; padding: 7px 13px; border-radius: 8px; }
.seg-btn:hover { color: var(--ink); }
.seg-btn.active { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }

.fc-start-row { display: flex; align-items: center; gap: 14px; margin-top: 24px; flex-wrap: wrap; }
.fc-start { border: none; background: var(--accent); color: #fff; font-size: 15px; font-weight: 700; padding: 13px 26px; border-radius: 12px; box-shadow: var(--shadow); transition: filter .12s, opacity .12s; }
.fc-start:hover { filter: brightness(1.06); }
.fc-start:disabled { opacity: .4; cursor: default; filter: none; }
.fc-start.alt { background: var(--ink); }
.fc-pool { color: var(--ink-faint); font-size: 13px; }
.fc-learned { margin-top: 16px; font-size: 13px; color: var(--ink-soft); border-top: 1px solid var(--line); padding-top: 14px; }
.fc-learned b { color: var(--accent); }

/* session */
.fc-bar { display: flex; align-items: center; gap: 14px; margin: 22px 0 8px; }
.fc-progress { flex: 1; height: 8px; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 5px; overflow: hidden; }
.fc-progress-fill { height: 100%; width: 0; background: var(--accent); border-radius: 5px; transition: width .3s; }
.fc-tally { font-size: 13px; color: var(--ink-soft); white-space: nowrap; }
.fc-tally .fc-good { color: var(--n5); font-weight: 700; }
.fc-tally .fc-bad { color: var(--accent); font-weight: 700; }

.fc-stage { display: flex; flex-direction: column; align-items: center; gap: 20px; padding: 10px 0 50px; }
.flashcard { width: 100%; max-width: 460px; height: 430px; perspective: 1600px; cursor: pointer; }
.fc-inner { position: relative; width: 100%; height: 100%; transition: transform .5s cubic-bezier(.4,.15,.2,1); transform-style: preserve-3d; }
.flashcard.flipped .fc-inner { transform: rotateY(180deg); }
.fc-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; background: var(--card); border: 1px solid var(--line-strong); border-radius: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 24px; overflow: hidden; }
.fc-back { transform: rotateY(180deg); justify-content: flex-start; }

.fc-front-char { font-family: var(--font-jp); font-size: 150px; line-height: 1; color: var(--ink); }
.fc-front-prompt { font-family: var(--font-jp); font-size: 30px; color: var(--ink); text-align: center; line-height: 1.5; }
.fc-front-sub { margin-top: 14px; color: var(--ink-faint); font-size: 14px; }
.fc-lvl-corner { position: absolute; top: 14px; left: 14px; font-size: 11px; font-weight: 700; color: #fff; padding: 3px 8px; border-radius: 7px; }
.fc-tap { position: absolute; bottom: 14px; color: var(--ink-faint); font-size: 12px; }

.fc-back-top { display: flex; align-items: center; gap: 14px; width: 100%; margin-bottom: 6px; }
.fc-back-char { font-family: var(--font-jp); font-size: 60px; line-height: 1; }
.fc-back-mean { font-size: 19px; font-weight: 700; color: var(--ink); }
.fc-back-scroll { width: 100%; overflow-y: auto; padding-right: 4px; }
.fc-back-read { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.fc-rd { background: var(--bg-soft); border-radius: 8px; padding: 4px 9px; font-size: 14px; font-family: var(--font-jp); }
.fc-rd .lb { font-family: var(--font); font-size: 10px; color: var(--ink-faint); margin-right: 5px; font-weight: 700; }
.fc-rd .rj { font-family: var(--font); font-size: 11px; color: var(--ink-faint); margin-left: 4px; }
.fc-mini { width: 150px; height: 150px; margin: 6px auto; }
.fc-mini svg { width: 100%; height: 100%; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.fc-back-meta { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 8px; font-size: 12px; color: var(--ink-faint); }

.fc-actions { display: flex; flex-direction: column; align-items: center; gap: 12px; min-height: 52px; }
.fc-flip { border: 1px solid var(--line-strong); background: var(--card); color: var(--ink); font-size: 15px; font-weight: 600; padding: 12px 26px; border-radius: 12px; }
.fc-flip:hover { background: var(--card-hover); }
.fc-rate { display: flex; gap: 12px; }
.fc-btn { font-size: 15px; font-weight: 700; padding: 12px 22px; border-radius: 12px; border: 1px solid transparent; }
.fc-again { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.fc-again:hover { background: var(--accent); color: #fff; }
.fc-got { background: var(--n5); color: #fff; }
.fc-got:hover { filter: brightness(1.08); }
.fc-btn .hint-kbd { opacity: .7; margin-left: 4px; }

.fc-summary { font-size: 15px; color: var(--ink); margin: 10px 0 22px; line-height: 1.9; }
.fc-summary .big-num { font-size: 40px; font-weight: 800; display: block; }
.fc-summary .acc-good { color: var(--n5); } .fc-summary .acc-bad { color: var(--accent); }
.fc-done-emoji { font-size: 46px; }
.fc-done-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---- Radical popup ---- */
.radical-box .rad-open { margin-left: 6px; color: var(--ink-faint); font-size: 18px; font-weight: 700; align-self: center; }
.radical-box.link:hover .rad-open { color: var(--accent); }
.rad-bigcard { width: 100%; max-width: 296px; margin: 0 auto; aspect-ratio: 1; display: grid; place-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 14px; font-family: var(--font-jp); font-size: 150px; color: var(--accent); }
.rad-forms { text-align: center; margin-top: 14px; font-size: 13px; color: var(--ink-faint); }
.rad-forms span { font-family: var(--font-jp); font-size: 20px; color: var(--ink); background: var(--bg-soft); border-radius: 7px; padding: 2px 9px; margin: 0 3px; }
.rad-lvl-group { margin-bottom: 16px; }
.rad-lvl-h { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.rad-lvl-h .lvl-tag { position: static; color: #fff; font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 6px; letter-spacing: .3px; }
.rad-lvl-n { font-size: 12px; color: var(--ink-faint); }
.detail-body.radmode .info-pane { padding-top: 22px; }

/* ---- Reading tab ---- */
#view-reading { max-width: 1180px; margin: 0 auto; padding: 0 20px 60px; }
.rl-intro { padding: 24px 4px 8px; }
.rl-intro h2 { font-size: 24px; margin: 0 0 6px; }
.rl-intro p { color: var(--ink-soft); font-size: 14px; margin: 0; max-width: 720px; }
.rl-tier { margin-top: 26px; }
.rl-tier-head { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.rl-emoji { font-size: 30px; }
.rl-tier-title { font-size: 18px; font-weight: 700; }
.rl-tier-lvl { font-size: 12px; color: var(--ink-faint); font-weight: 600; border: 1px solid var(--line-strong); border-radius: 6px; padding: 1px 7px; margin-left: 6px; }
.rl-tier-desc { font-size: 13px; color: var(--ink-faint); margin-top: 2px; }
.rl-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.rl-card { text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; cursor: pointer; transition: transform .12s, box-shadow .12s, border-color .12s; }
.rl-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--line-strong); }
.rl-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.rl-card-top .lvl-tag { position: static; color: #fff; font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 6px; }
.rl-check { font-size: 11px; color: var(--n5); font-weight: 700; }
.rl-title { font-family: var(--font-jp); font-size: 22px; color: var(--ink); line-height: 1.3; }
.rl-title-en { font-size: 13px; color: var(--ink-soft); margin-top: 3px; }
.rl-meta { font-size: 11.5px; color: var(--ink-faint); margin-top: 10px; }

/* reader */
#reading-reader { max-width: 820px; margin: 0 auto; }
.rd-bar { position: sticky; top: 96px; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 0; background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(8px); flex-wrap: wrap; }
.rd-controls { display: flex; align-items: center; gap: 8px; }
.seg-btn2 { border: 1px solid var(--line-strong); background: var(--card); color: var(--ink-soft); font-size: 13px; font-weight: 700; padding: 8px 12px; border-radius: 10px; }
.seg-btn2.on { background: var(--accent); color: #fff; border-color: transparent; }
.rd-font { display: inline-flex; gap: 4px; }
.rd-font .ctrl { height: 38px; }
.rd-head { padding: 8px 0 18px; border-bottom: 1px solid var(--line); margin-bottom: 18px; }
.rd-title { font-family: var(--font-jp); font-size: 30px; font-weight: 700; }
.rd-title-en { color: var(--ink-soft); font-size: 15px; margin-top: 4px; }
.rd-tags { display: flex; align-items: center; gap: 10px; margin-top: 10px; }
.rd-tags .lvl-tag { position: static; color: #fff; font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 7px; }
.rd-tier { font-size: 13px; color: var(--ink-faint); }

.rd-body { line-height: 2.5; color: var(--ink); }
.r-sent { padding: 10px 0; border-bottom: 1px solid transparent; }
.r-sent.show-en, .r-sent.show-read { border-bottom-color: var(--line); padding-bottom: 14px; }
.r-jp { font-family: var(--font-jp); position: relative; }
.r-jp ruby rt { font-size: .52em; color: var(--ink-faint); font-family: var(--font); font-weight: 400; }
.rd-body.furi-off ruby rt { visibility: hidden; }
.r-jp .rk { cursor: pointer; border-radius: 3px; transition: background .1s, color .1s; }
.r-jp .rk:hover { background: var(--accent-soft); color: var(--accent); }

/* per-row reveal tools */
.r-tools { display: inline-flex; gap: 5px; margin-left: 8px; vertical-align: middle; white-space: nowrap; }
.r-tool { font-family: var(--font); font-size: 11px; font-weight: 700; color: var(--ink-faint); background: var(--bg-soft); border: 1px solid var(--line); border-radius: 7px; padding: 2px 7px; line-height: 1.5; opacity: .55; transition: opacity .12s, color .12s, border-color .12s; }
.r-sent:hover .r-tool { opacity: 1; }
.r-tool:hover { color: var(--accent); border-color: var(--accent); }
.r-sent.show-en .r-tool[data-act="en"], .r-sent.show-read .r-tool[data-act="read"] { opacity: 1; color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

.r-read { display: none; font-family: var(--font); font-size: .56em; color: var(--accent); line-height: 1.5; margin: 6px 0 0; padding-left: 12px; border-left: 2px solid var(--accent-soft); letter-spacing: .2px; }
.r-en { display: none; font-family: var(--font); font-size: .62em; color: var(--ink-soft); line-height: 1.5; margin: 6px 0 0; padding-left: 12px; border-left: 2px solid var(--line); }
.r-sent.show-read .r-read { display: block; }
.r-sent.show-en .r-en { display: block; }

.rd-foot { margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; }
.rd-credit { font-size: 12px; color: var(--ink-faint); max-width: 70%; }
@media (max-width: 640px) { .rd-bar { top: 132px; } }