:root {
  --bg: #f6f3ee;
  --card: #ffffff;
  --ink: #1d1b19;
  --muted: #6b655d;
  --line: #e4ded4;
  --accent: #c8102e;
  --accent-ink: #ffffff;
  --ok: #1e8e3e;
  --ok-bg: #e6f4ea;
  --bad: #c5221f;
  --bad-bg: #fce8e6;
  --soft: #f0ebe3;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 14px rgba(0,0,0,.05);
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161412; --card: #211e1b; --ink: #f1ece5; --muted: #a59d92; --line: #36312b;
    --accent: #ef4b5f; --ok: #5bc77a; --ok-bg: #1d3524; --bad: #f28b82; --bad-bg: #3d1f1d;
    --soft: #2a2622; --shadow: none; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #161412; --card: #211e1b; --ink: #f1ece5; --muted: #a59d92; --line: #36312b;
  --accent: #ef4b5f; --ok: #5bc77a; --ok-bg: #1d3524; --bad: #f28b82; --bad-bg: #3d1f1d;
  --soft: #2a2622; --shadow: none; color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font-family: 'IBM Plex Sans Thai', system-ui, sans-serif;
  font-size: 16px; line-height: 1.55;
  -webkit-tap-highlight-color: transparent;
}
button { font: inherit; color: inherit; cursor: pointer; }
button:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; gap: 10px; align-items: center; background: none; border: 0; padding: 0; text-align: left; }
.brand b { display: block; font-size: 17px; line-height: 1.2; }
.brand small { color: var(--muted); font-size: 12px; }
.stamp {
  width: 36px; height: 36px; border-radius: 9px; display: grid; place-items: center;
  background: var(--accent); color: #fff; font-size: 18px;
}
.icon-btn { width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line); background: var(--card); }

main { max-width: 760px; margin: 0 auto; padding: 16px 16px 60px; }

h1 { font-size: 24px; margin: 6px 0 4px; line-height: 1.3; }
h2 { font-size: 18px; margin: 22px 0 10px; }
h3 { font-size: 16px; margin: 0 0 4px; }
.sub { color: var(--muted); margin: 0 0 14px; font-size: 14px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px; box-shadow: var(--shadow); }
.stack > * + * { margin-top: 12px; }

/* scope chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: var(--card); border-radius: 999px;
  padding: 7px 14px; font-size: 14px; display: inline-flex; align-items: center; gap: 6px;
}
.chip .dot { width: 9px; height: 9px; border-radius: 50%; }
.chip[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.chip.big { padding: 10px 16px; font-weight: 600; }
.scope-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 10px; }
.scope-row .chip { justify-content: center; border-radius: 12px; }
details.more summary { cursor: pointer; color: var(--muted); font-size: 14px; margin: 4px 0 8px; }

/* modes */
.modes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.mode {
  text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 14px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 2px; min-height: 104px;
}
.mode:hover { border-color: var(--accent); }
.mode .ico { font-size: 22px; }
.mode b { font-size: 16px; }
.mode span { color: var(--muted); font-size: 13px; line-height: 1.4; }
.mode.wide { grid-column: 1 / -1; flex-direction: row; align-items: center; gap: 12px; min-height: 0; }
.mode div { display: flex; flex-direction: column; }

.progress-bar { height: 8px; border-radius: 8px; background: var(--soft); overflow: hidden; }
.progress-bar i { display: block; height: 100%; background: var(--ok); border-radius: 8px; transition: width .3s; }
.stat-row { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); margin-bottom: 6px; }

/* group list */
.glist { display: grid; gap: 8px; }
.gitem {
  display: grid; grid-template-columns: 6px 1fr auto; gap: 12px; align-items: center;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; text-align: left;
}
.gitem .bar { width: 6px; height: 100%; min-height: 34px; border-radius: 4px; }
.gitem small { color: var(--muted); display: block; font-size: 13px; }
.gitem .pct { font-family: var(--mono); font-size: 13px; color: var(--muted); }

/* learn */
.tipbox { border-left: 4px solid var(--gc, var(--accent)); background: var(--soft); border-radius: 0 10px 10px 0; padding: 10px 12px; }
.chant { font-weight: 600; }
.pattern { font-family: var(--mono); font-size: 22px; letter-spacing: 3px; }
.series { border-top: 1px dashed var(--line); padding-top: 12px; }
.codes { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; margin-top: 10px; }
.codecell {
  border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; background: var(--card);
  display: flex; flex-direction: column; gap: 0; text-align: left;
}
.codecell .nm { font-size: 14px; }
.codecell .note { font-size: 12px; color: var(--muted); line-height: 1.35; margin-top: 2px; }
.code { font-family: var(--mono); font-size: 20px; letter-spacing: 1px; }
.code .dim { opacity: .35; }
.code .hl { color: var(--gc, var(--accent)); font-weight: 700; }
.codecell.hidden .code { filter: blur(7px); }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.btn {
  border: 1px solid var(--line); background: var(--card); border-radius: 10px; padding: 9px 14px; font-size: 15px;
}
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn.block { width: 100%; padding: 13px; font-size: 16px; }
.btn:disabled { opacity: .5; cursor: default; }

/* number map */
.nmap { display: grid; grid-template-columns: 30px repeat(10, 1fr); gap: 3px; font-size: 11px; }
.nmap .hd { text-align: center; color: var(--muted); font-family: var(--mono); font-size: 12px; align-self: center; }
.nmap .c {
  min-height: 52px; border-radius: 6px; padding: 3px 2px; text-align: center; line-height: 1.15;
  display: flex; flex-direction: column; align-items: center; justify-content: center; border: 0;
  background: var(--soft); color: var(--muted); overflow: hidden; word-break: break-all;
}
.nmap .c b { font-family: var(--mono); font-size: 12px; }
.nmap .c.on { color: #fff; }
.nmap .c.on span { font-size: 10.5px; }
.nmap .c.dim { opacity: .25; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 12px; font-size: 13px; margin-top: 10px; }
.legend span { display: inline-flex; gap: 5px; align-items: center; }
.legend i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.bandlist { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; font-size: 14px; }
.bandlist b { font-family: var(--mono); }

/* quiz */
.qhead { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 10px; font-size: 14px; color: var(--muted); }
.qhead .score { font-family: var(--mono); color: var(--ink); font-weight: 700; }
.qcard { text-align: center; padding: 22px 16px; }
.qtag { display: inline-block; font-size: 12px; padding: 2px 10px; border-radius: 999px; color: #fff; margin-bottom: 8px; }
.qprompt { color: var(--muted); font-size: 14px; }
.qbig { font-size: 30px; font-weight: 700; line-height: 1.25; margin: 4px 0; word-break: break-word; }
.qbig.code { font-size: 40px; letter-spacing: 4px; }
.opts { display: grid; gap: 10px; margin-top: 14px; }
.opts.two { grid-template-columns: 1fr 1fr; }
.opt {
  background: var(--card); border: 2px solid var(--line); border-radius: 12px; padding: 14px 12px;
  font-size: 18px; min-height: 58px; transition: transform .08s;
}
.opt.mono { font-family: var(--mono); font-size: 22px; letter-spacing: 2px; }
.opt:active { transform: scale(.98); }
.opt.ok { border-color: var(--ok); background: var(--ok-bg); }
.opt.bad { border-color: var(--bad); background: var(--bad-bg); }
.opt:disabled { cursor: default; }
.feedback { margin-top: 14px; text-align: left; border-radius: 12px; padding: 12px 14px; font-size: 15px; }
.feedback.ok { background: var(--ok-bg); }
.feedback.bad { background: var(--bad-bg); }
.feedback .code { font-size: 22px; }

.typein { display: flex; gap: 8px; margin-top: 14px; }
.typein input {
  flex: 1; min-width: 0; font-family: var(--mono); font-size: 30px; letter-spacing: 8px; text-align: center;
  padding: 10px; border-radius: 12px; border: 2px solid var(--line); background: var(--card); color: var(--ink);
}
.keypad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 10px; }
.keypad button { padding: 14px 0; font-size: 22px; font-family: var(--mono); border-radius: 12px; border: 1px solid var(--line); background: var(--card); }
.digits { display: flex; justify-content: center; gap: 6px; margin-top: 8px; }
.digits span { font-family: var(--mono); font-size: 22px; width: 34px; padding: 4px 0; border-radius: 8px; }
.digits .r { background: var(--ok-bg); color: var(--ok); }
.digits .w { background: var(--bad-bg); color: var(--bad); }

.timer { height: 6px; background: var(--soft); border-radius: 6px; overflow: hidden; margin-bottom: 12px; }
.timer i { display: block; height: 100%; background: var(--accent); transition: width 1s linear; }
.combo { color: var(--accent); font-weight: 700; }

/* match */
.mgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.mcol { display: grid; gap: 8px; align-content: start; }
.mtile {
  border: 2px solid var(--line); border-radius: 12px; background: var(--card); padding: 12px 8px; min-height: 54px;
  font-size: 15px; transition: opacity .25s;
}
.mtile.mono { font-family: var(--mono); font-size: 19px; letter-spacing: 1px; }
.mtile.sel { border-color: var(--accent); background: var(--soft); }
.mtile.done { opacity: 0; pointer-events: none; }
.mtile.bad { border-color: var(--bad); background: var(--bad-bg); }

/* result */
.big-score { font-size: 54px; font-weight: 700; font-family: var(--mono); line-height: 1; }
.wrong-list { display: grid; gap: 8px; }
.wrong-list .codecell { flex-direction: row; justify-content: space-between; align-items: center; gap: 10px; }

.flash { perspective: 800px; }
.fcard {
  min-height: 230px; border-radius: 16px; border: 1px solid var(--line); background: var(--card); box-shadow: var(--shadow);
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 20px; gap: 8px;
}

.muted { color: var(--muted); }
.small { font-size: 13px; }
.center { text-align: center; }
.row { display: flex; gap: 8px; }
.row > * { flex: 1; }

@media (max-width: 420px) {
  .qbig { font-size: 26px; }
  .qbig.code { font-size: 34px; }
  .opt { font-size: 16px; }
  .nmap { font-size: 10px; gap: 2px; grid-template-columns: 22px repeat(10, 1fr); }
  .nmap .c { min-height: 46px; }
  .nmap .c.on span { font-size: 9px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }