/* ==========================================================================
   Codebusters Training Center — styles
   ========================================================================== */
:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-2: #eef1f7;
  --ink: #1a2133;
  --ink-2: #3b4459;
  --muted: #667085;
  --line: #dde2ec;
  --accent: #2f5bea;
  --accent-ink: #ffffff;
  --accent-soft: #e6edff;
  --good: #0f8a5f;
  --good-soft: #e3f6ee;
  --bad: #d23b3b;
  --bad-soft: #fdecec;
  --warn: #b86e00;
  --warn-soft: #fff4dc;
  --hl: #fff1b8;
  --hl-strong: #ffd84d;
  --a-sym: #2f5bea;
  --b-sym: #c2410c;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .06);
  --radius: 12px;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f131c; --surface: #171c28; --surface-2: #1f2534; --ink: #e8ecf5; --ink-2: #c3cad9; --muted: #8f99ad;
    --line: #2c3446; --accent: #6d8cff; --accent-ink: #0b0f18; --accent-soft: #1e2a4d; --good: #3ecf8e; --good-soft: #10291f;
    --bad: #ff6b6b; --bad-soft: #341717; --warn: #f5b041; --warn-soft: #33270f; --hl: #3a3417; --hl-strong: #6b5a12;
    --a-sym: #86a1ff; --b-sym: #ff9a62; --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 16px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f131c; --surface: #171c28; --surface-2: #1f2534; --ink: #e8ecf5; --ink-2: #c3cad9; --muted: #8f99ad;
  --line: #2c3446; --accent: #6d8cff; --accent-ink: #0b0f18; --accent-soft: #1e2a4d; --good: #3ecf8e; --good-soft: #10291f;
  --bad: #ff6b6b; --bad-soft: #341717; --warn: #f5b041; --warn-soft: #33270f; --hl: #3a3417; --hl-strong: #6b5a12;
  --a-sym: #86a1ff; --b-sym: #ff9a62; --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 16px rgba(0, 0, 0, .25);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 var(--sans); overflow-x: hidden; }
a { color: var(--accent); }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: clamp(1.7rem, 3.5vw, 2.4rem); letter-spacing: -.02em; }
h2 { font-size: 1.35rem; margin-top: 1.6em; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 .8em; }
.mono { font-family: var(--mono); }
.small { font-size: .86rem; }
.muted { color: var(--muted); }
.big { font-size: 1.25rem; }
.good { color: var(--good); font-weight: 600; }
.bad { color: var(--bad); font-weight: 600; }
.row { display: flex; align-items: center; }
.gap { gap: 10px; }
.wrap { flex-wrap: wrap; }
.wrapall { word-break: break-all; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; z-index: 99; background: var(--surface); padding: 6px 10px; }

/* ---------- top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 16px; padding: 10px 20px;
  background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); flex-shrink: 0; }
.logo { display: grid; place-items: center; width: 36px; height: 36px; border-radius: 10px; background: var(--accent); color: var(--accent-ink); font-weight: 800; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text small { color: var(--muted); font-size: .72rem; }
.nav { display: flex; gap: 2px; flex-wrap: wrap; flex: 1; }
.nav a { padding: 6px 10px; border-radius: 8px; color: var(--ink-2); text-decoration: none; font-size: .93rem; }
.nav a:hover { background: var(--surface-2); }
.nav a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.top-actions { display: flex; gap: 6px; margin-left: auto; }
.icon-btn { border: 1px solid var(--line); background: var(--surface); color: var(--ink); width: 36px; height: 36px; border-radius: 10px; font-size: 1.05rem; cursor: pointer; }
.icon-btn.menu { display: none; }
@media (max-width: 1080px) {
  .icon-btn.menu { display: inline-block; }
  .nav { display: none; position: absolute; top: 57px; left: 0; right: 0; flex-direction: column; background: var(--surface); border-bottom: 1px solid var(--line); padding: 8px 16px 14px; box-shadow: var(--shadow); }
  .nav-open .nav { display: flex; }
  .nav a { padding: 10px 12px; }
}

/* ---------- layout ---------- */
main { max-width: 1180px; margin: 0 auto; padding: 24px 20px 60px; outline: none; }
.page-head { margin-bottom: 18px; }
.lead { font-size: 1.08rem; color: var(--ink-2); max-width: 820px; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .78rem; font-weight: 700; color: var(--accent); margin-bottom: 8px; }
.foot p { margin: 0 0 6px; }
.foot .copyright { color: var(--ink-2); font-weight: 600; }
.foot { max-width: 1180px; margin: 0 auto; padding: 20px; color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); }
@media (max-width: 600px) { main { padding: 16px 16px 48px; } .topbar { padding: 8px 12px; } }

/* ---------- buttons & inputs ---------- */
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 9px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); font: 600 .95rem var(--sans); text-decoration: none; cursor: pointer; transition: transform .05s, background .15s; }
.btn:hover { background: var(--surface-2); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.sm { padding: 5px 10px; font-size: .85rem; border-radius: 8px; }
.btn.big-btn { padding: 12px 22px; font-size: 1.05rem; }
.btn.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.txt { font: 1rem var(--sans); padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); max-width: 100%; }
textarea.txt { width: 100%; resize: vertical; }
.txt.num { width: 70px; }
.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 10px; font-size: .85rem; color: var(--muted); }
.field .txt { color: var(--ink); }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: var(--surface); flex-wrap: wrap; }
.seg button { border: 0; background: transparent; padding: 8px 14px; font: 600 .88rem var(--sans); color: var(--ink-2); cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on { background: var(--accent); color: var(--accent-ink); }
.controls { margin-bottom: 16px; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); font-size: .76rem; font-weight: 600; }
.badge.reg { background: var(--accent-soft); color: var(--accent); }
.badge.st { background: var(--warn-soft); color: var(--warn); }
.badge.hi { background: var(--good-soft); color: var(--good); }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 10px; }
.new { margin-left: 8px; font-size: .65rem; background: var(--bad); color: #fff; padding: 2px 6px; border-radius: 6px; vertical-align: middle; letter-spacing: .05em; }

/* ---------- home ---------- */
.hero { display: grid; grid-template-columns: 1.4fr 1fr; gap: 28px; align-items: center; background: var(--surface); border: 1px solid var(--line);
  border-radius: 18px; padding: 32px; box-shadow: var(--shadow); }
.hero-art { background: var(--surface-2); border-radius: 14px; padding: 18px; display: flex; flex-direction: column; gap: 10px; overflow: hidden; }
.ha-row { display: flex; gap: 4px; flex-wrap: wrap; letter-spacing: .06em; }
.ha-c, .ha-p { width: 1.6em; text-align: center; padding: 4px 0; border-radius: 6px; font-weight: 700; }
.ha-c { background: var(--accent); color: var(--accent-ink); }
.ha-p { background: var(--hl); color: var(--ink); }
.ha-row.small { color: var(--muted); font-size: .85rem; }
@media (max-width: 800px) { .hero { grid-template-columns: 1fr; padding: 22px; } }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin: 20px 0; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; display: flex; flex-direction: column; }
.stat b { font-size: 1.6rem; }
.stat span { color: var(--muted); font-size: .85rem; }
.path { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.pstep { display: flex; flex-direction: column; gap: 4px; padding: 16px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--line);
  text-decoration: none; color: var(--ink); }
.pstep:hover { border-color: var(--accent); }
.pstep span:last-child { color: var(--muted); font-size: .9rem; }
.pn { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); font-weight: 800; font-size: .9rem; }
.cgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.ccard { display: flex; gap: 14px; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--ink); transition: border-color .15s, transform .1s; }
.ccard:hover { border-color: var(--accent); transform: translateY(-1px); }
.cicon { flex-shrink: 0; display: grid; place-items: center; width: 54px; height: 54px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); font-weight: 800; font-size: .95rem; }
.ccard h3 { margin: 0; }
.ccard .fam { font-size: .78rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 4px; }
.ccard p { font-size: .9rem; color: var(--ink-2); margin-bottom: 6px; }

/* ---------- prose / guide ---------- */
.prose { max-width: 900px; }
.prose li { margin-bottom: 6px; }
.callout { background: var(--accent-soft); border-left: 4px solid var(--accent); padding: 12px 16px; border-radius: 8px; margin: 12px 0 18px; }
table.data { border-collapse: collapse; width: 100%; background: var(--surface); border-radius: 10px; overflow: hidden; font-size: .92rem; }
table.data th, table.data td { padding: 8px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.data tr:first-child th { background: var(--surface-2); }
.table-scroll { overflow-x: auto; max-width: 100%; -webkit-overflow-scrolling: touch; }
.score-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; }
.scard { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.scard p { margin: 6px 0 0; font-size: .92rem; color: var(--ink-2); }
ol.order { columns: 2; column-gap: 32px; }
@media (max-width: 600px) { ol.order { columns: 1; } }

/* ---------- lesson ---------- */
.toc { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 8px; }
.toc a { font-size: .85rem; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line); text-decoration: none; color: var(--ink-2); background: var(--surface); }
.lsec { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 22px; margin-top: 16px; scroll-margin-top: 80px; }
.lsec h2 { margin-top: 0; }
.strategy li { margin-bottom: 8px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 700px) { .two { grid-template-columns: 1fr; } .lsec { padding: 16px; } }
.tipbox { background: var(--good-soft); border-radius: 10px; padding: 12px 16px; }
.tipbox.warn { background: var(--warn-soft); }
.tipbox ul { margin: 0; padding-left: 18px; }
.cta { margin-top: 20px; }
.alpha-pair { display: inline-flex; flex-direction: column; gap: 2px; background: var(--surface-2); padding: 10px 14px; border-radius: 8px; letter-spacing: .08em; overflow-x: auto; max-width: 100%; }
.alpha-pair div:last-child { color: var(--accent); font-weight: 700; }

/* worked-example stepper */
.stepper { border: 1px solid var(--line); border-radius: 10px; padding: 16px; background: var(--bg); }
.ex-intro { margin-bottom: 10px; }
.ex-intro .big { display: block; margin: 8px 0; word-break: break-word; }
.dots { display: flex; gap: 6px; margin-bottom: 10px; }
.dot { width: 28px; height: 6px; border-radius: 3px; border: 0; background: var(--line); cursor: pointer; padding: 0; }
.dot.on { background: var(--accent); }
.step { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin-bottom: 10px; animation: fadein .25s ease; }
.step h4 { margin: 0 0 8px; color: var(--accent); }
.step-nav { margin-top: 6px; }
@keyframes fadein { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.ex-pair { font-family: var(--mono); margin: 10px 0; overflow-x: auto; }
.ex-pair > div { display: flex; }
.ex-pair span { display: inline-block; width: 1.05em; text-align: center; flex-shrink: 0; }
.ex-c { color: var(--ink-2); }
.ex-p span { color: var(--muted); }
.ex-p span.hit { color: var(--good); font-weight: 800; }
.ex-table { border-collapse: collapse; margin: 8px 0; }
.ex-table th, .ex-table td { border: 1px solid var(--line); padding: 3px 6px; text-align: center; min-width: 1.7em; }
.ex-table th { background: var(--surface-2); }
.ex-table.small { font-size: .82rem; }
.ex-note { margin-top: 8px; padding: 8px 12px; border-radius: 8px; background: var(--good-soft); font-size: .92rem; }
.ex-stack { display: flex; flex-direction: column; gap: 2px; letter-spacing: .25em; overflow-x: auto; margin: 8px 0; }
.ex-stack .k { color: var(--warn); }
.ex-stack .p { color: var(--good); font-weight: 700; }
.fm-row { display: flex; flex-wrap: wrap; gap: 4px; margin: 8px 0; }
pre.crypt { background: var(--surface-2); padding: 10px 14px; border-radius: 8px; display: inline-block; margin: 8px 0; }

/* playground */
.playground { display: flex; flex-direction: column; gap: 8px; }
.pg-out { background: var(--bg); border: 1px dashed var(--line); border-radius: 10px; padding: 12px 14px; min-height: 48px; overflow-x: auto; }
.pg-out .big { word-break: break-word; }
.brute { max-height: 260px; overflow: auto; font-size: .85rem; }
.brute b { display: inline-block; width: 3em; color: var(--muted); }
table.sq td { min-width: 2.2em; }

/* ---------- question card ---------- */
.qcard { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; box-shadow: var(--shadow); }
.qcard.is-special { border-color: var(--hl-strong); box-shadow: 0 0 0 3px var(--hl); }
.qhead { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.qtitle { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.qnum { font-weight: 800; }
.qtype { font-weight: 700; color: var(--accent); }
.qmode { font-size: .85rem; color: var(--muted); }
.qmeta { display: flex; gap: 10px; align-items: center; }
.pts { background: var(--surface-2); padding: 3px 10px; border-radius: 999px; font-weight: 700; font-size: .88rem; }
.pts.timed { background: var(--warn-soft); color: var(--warn); }
.special { background: var(--hl); padding: 3px 10px; border-radius: 999px; font-weight: 700; font-size: .85rem; }
.qclock { color: var(--muted); }
.qprompt { margin-bottom: 14px; font-size: 1.02rem; }
.qactions { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); }
.qresult { margin-top: 12px; }
.okbox, .badbox, .info { padding: 10px 14px; border-radius: 10px; }
.okbox { background: var(--good-soft); }
.badbox { background: var(--bad-soft); }
.info { background: var(--accent-soft); }
.solution { margin-top: 10px; padding: 10px 14px; border-radius: 10px; background: var(--surface-2); display: flex; flex-direction: column; gap: 6px; }

/* ---------- workspace: substitution ---------- */
.cipher-block { display: flex; flex-wrap: wrap; gap: 10px 14px; padding: 14px; background: var(--bg); border-radius: 10px; margin-bottom: 12px; }
.word { display: inline-flex; gap: 2px; }
.cell { display: inline-flex; flex-direction: column; align-items: center; border-radius: 6px; padding: 2px 1px; }
.cell .ct { font: 700 1.05rem var(--mono); color: var(--ink-2); line-height: 1.3; min-width: 1.3em; text-align: center; }
input.pt { width: 1.75em; height: 1.9em; text-align: center; font: 700 1.05rem var(--mono); border: 0; border-bottom: 2px solid var(--line);
  background: transparent; color: var(--good); padding: 0; border-radius: 4px 4px 0 0; text-transform: uppercase; caret-color: var(--accent); }
input.pt:focus { outline: none; background: var(--hl); border-bottom-color: var(--accent); }
input.pt::placeholder { color: var(--muted); opacity: .75; }
.cell.punct .pt-static { height: 1.9em; line-height: 1.9em; color: var(--muted); font-family: var(--mono); }
.cell.same { background: var(--hl); }
.cell.dup input.pt { color: var(--bad); }
.cell.wrong { background: var(--bad-soft); box-shadow: inset 0 -2px 0 var(--bad); }
.cell.hinted input.pt { color: var(--warn); }
.units-wide .cell .ct { font-size: .92rem; min-width: 2.1em; }
.units-wide .cell input.pt { width: 2.1em; }
.freq-wrap { overflow-x: auto; margin-bottom: 8px; }
table.freq { border-collapse: collapse; font-size: .85rem; }
table.freq th, table.freq td { border: 1px solid var(--line); padding: 2px 3px; text-align: center; }
table.freq th { background: var(--surface-2); font-weight: 600; white-space: nowrap; padding: 2px 8px; }
table.freq td.cnt { color: var(--muted); }
table.freq td.same { background: var(--hl); }
table.freq input.pt { width: 1.6em; height: 1.7em; font-size: .95rem; }
table.freq input.pt:disabled { opacity: .3; }
.usage-row { margin: 6px 0 10px; }
.usage { display: inline-flex; flex-wrap: wrap; gap: 2px; }
.usage .u { width: 1.4em; text-align: center; border-radius: 4px; color: var(--muted); background: var(--surface-2); font-size: .85rem; }
.usage .u.on { background: var(--good-soft); color: var(--good); text-decoration: line-through; }
.usage .u.dup { background: var(--bad-soft); color: var(--bad); }
.tools { display: flex; flex-direction: column; gap: 10px; }
details.tool { border: 1px solid var(--line); border-radius: 10px; background: var(--bg); margin-top: 10px; }
details.tool > summary { cursor: pointer; padding: 8px 14px; font-weight: 700; font-size: .92rem; }
.tool-body { padding: 4px 14px 14px; overflow-x: auto; }

/* polybius editor */
.poly-wrap { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }
table.poly-edit { border-collapse: collapse; }
table.poly-edit th { width: 2em; color: var(--accent); font-family: var(--mono); }
table.poly-edit td { border: 1px solid var(--line); padding: 0; }
table.poly-edit input.pt { width: 2.2em; height: 2.2em; border-bottom: 0; }
input.pt.dup { color: var(--bad); background: var(--bad-soft); }

/* homophonic bands */
.bands { display: flex; flex-direction: column; gap: 8px; }
.band-row { display: flex; gap: 10px; align-items: flex-start; }
.band-label { display: flex; flex-direction: column; min-width: 110px; font-size: .9rem; }
.band-label input.pt { border: 1px solid var(--line); border-radius: 6px; }
.band-scroll { overflow-x: auto; }
table.band { border-collapse: collapse; font-size: .78rem; }
table.band td { border: 1px solid var(--line); text-align: center; padding: 1px 2px; min-width: 1.9em; }
table.band td.present { font-weight: 800; color: var(--accent); }
table.band td.cnt { color: var(--muted); }
table.band input.pt { width: 1.5em; height: 1.6em; font-size: .85rem; }
@media (max-width: 700px) { .band-row { flex-direction: column; } }

/* ---------- workspace: polyalphabetic grids (Porta, Nihilist) ---------- */
.ws-controls { margin-bottom: 10px; font-size: .92rem; }
.poly-grid { display: flex; flex-wrap: wrap; gap: 8px 2px; padding: 12px; background: var(--bg); border-radius: 10px; }
.gap5 { width: 12px; }
.pcol { display: inline-flex; flex-direction: column; align-items: center; border-radius: 6px; padding: 2px 1px; }
.pcol .ct { font: 700 1.05rem var(--mono); line-height: 1.5; }
.pcol .ct.num { font-size: .95rem; min-width: 2.4em; text-align: center; }
.pcol input.pt.key, input.pt.key { color: var(--warn); font-size: .9rem; height: 1.6em; }
.pcol.same { background: var(--hl); }
.pcol.crib { box-shadow: inset 0 0 0 1px var(--accent); }
.pcol.wrong { background: var(--bad-soft); }
input.kv { width: 2.4em; text-align: center; font: 600 .9rem var(--mono); border: 1px solid var(--line); border-radius: 5px; background: var(--surface); color: var(--warn); padding: 2px 0; }
.diff { font: .85rem var(--mono); color: var(--muted); min-height: 1.3em; }
.diff.bad { color: var(--bad); }
.poly-grid.nih { gap: 10px 4px; }
.legend { margin-bottom: 6px; }
table.porta-table { border-collapse: collapse; font-size: .85rem; }
table.porta-table th, table.porta-table td { border: 1px solid var(--line); padding: 2px 6px; text-align: center; }
table.porta-table th { background: var(--surface-2); }
table.porta-table .hl { background: var(--hl); }
table.porta-table .hlx { background: var(--hl-strong); font-weight: 800; }
table.period td.x { color: var(--accent); font-weight: 700; }
table.period td.good { color: var(--good); font-weight: 700; }
table.period td.bad { color: var(--bad); font-weight: 700; }

/* ---------- workspace: Baconian ---------- */
.sym-panel { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 12px; }
.sym { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line); background: var(--surface); border-radius: 8px; padding: 4px 8px; cursor: pointer; font: 600 .95rem var(--sans); color: var(--ink); }
.sym-c { font-family: var(--mono); font-size: 1.05rem; }
.sym-v { display: inline-grid; place-items: center; width: 1.5em; height: 1.5em; border-radius: 4px; background: var(--surface-2); font-family: var(--mono); }
.sym-n { font-size: .75rem; color: var(--muted); }
.sym.a { border-color: var(--a-sym); } .sym.a .sym-v { background: var(--a-sym); color: #fff; }
.sym.b { border-color: var(--b-sym); } .sym.b .sym-v { background: var(--b-sym); color: #fff; }
.bacon-raw { padding: 10px; background: var(--bg); border-radius: 8px; word-break: break-all; margin: 6px 0; }
.bacon-grid { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px; background: var(--bg); border-radius: 10px; }
.b-group { display: flex; flex-direction: column; align-items: center; gap: 2px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
.b-group.wrong { background: var(--bad-soft); border-color: var(--bad); }
.b-syms { font-size: 1.1rem; letter-spacing: .12em; }
.b-group.word .b-syms { letter-spacing: .06em; }
.b-code { font-size: .8rem; color: var(--muted); letter-spacing: .12em; }
.b-code.bad { color: var(--bad); }
table.bacon-table { border-collapse: collapse; font-size: .88rem; }
table.bacon-table td, table.bacon-table th { border: 1px solid var(--line); padding: 3px 8px; }
table.bacon-table th { color: var(--accent); }

/* ---------- workspace: Fractionated Morse ---------- */
table.fm-table { border-collapse: collapse; font-size: .85rem; }
table.fm-table th, table.fm-table td { border: 1px solid var(--line); padding: 1px 2px; text-align: center; min-width: 1.6em; }
table.fm-table th { background: var(--surface-2); padding: 1px 6px; }
table.fm-table td.fs { font-family: var(--mono); }
table.fm-table input.pt { width: 1.5em; height: 1.6em; font-size: .9rem; }
.fm-cells { display: flex; flex-wrap: wrap; gap: 4px; padding: 10px; background: var(--bg); border-radius: 10px; margin: 6px 0 10px; }
.fm-cell { display: flex; flex-direction: column; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; padding: 2px 5px; min-width: 2.4em; }
.fm-cell b { font-family: var(--mono); }
.fm-cell span { font-family: var(--mono); font-size: .85rem; color: var(--muted); }
.fm-cell.known span { color: var(--accent); }
.fm-cell.wrong { background: var(--bad-soft); }
.fm-out { display: flex; flex-wrap: wrap; gap: 6px 4px; align-items: flex-end; padding: 10px; background: var(--bg); border-radius: 10px; min-height: 48px; }
.fm-word { display: inline-flex; gap: 3px; }
.fm-letter { display: inline-flex; flex-direction: column; align-items: center; padding: 2px 4px; border-radius: 6px; background: var(--surface); }
.fm-letter .s { font-size: .7rem; color: var(--muted); }
.fm-letter b { color: var(--good); font-family: var(--mono); }
.fm-letter.unk b { color: var(--muted); }
.fm-letter.bad b { color: var(--bad); }
.fm-sep { color: var(--muted); padding: 0 4px; font-weight: 700; }
.morse-chart { display: grid; grid-template-columns: repeat(auto-fill, minmax(88px, 1fr)); gap: 4px 10px; font-size: .9rem; }

/* ---------- workspace: Cryptarithm ---------- */
.crypt-eq { background: var(--bg); border-radius: 10px; padding: 12px 16px; display: inline-flex; flex-direction: column; gap: 2px; }
.ceq-row { display: flex; gap: 2px; }
.ceq-sign { width: 1.4em; text-align: center; font-weight: 700; align-self: flex-start; font-size: 1.2rem; }
.ceq-cell { width: 1.9em; display: flex; flex-direction: column; align-items: center; }
.ceq-cell b { font-size: 1.2rem; }
.ceq-cell i { font-style: normal; color: var(--good); font-weight: 700; min-height: 1.3em; }
.ceq-bar { border-top: 2px solid var(--ink); margin: 2px 0 4px 1.4em; }
.crypt-assign { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 12px; }
.dcell { display: inline-flex; flex-direction: column; align-items: center; background: var(--surface-2); padding: 4px 8px; border-radius: 8px; font-family: var(--mono); }
.dcell input.dig { width: 1.8em; }
table.elim { border-collapse: collapse; font-size: .85rem; }
table.elim th, table.elim td { border: 1px solid var(--line); width: 1.9em; height: 1.9em; text-align: center; }
table.elim td { cursor: pointer; user-select: none; }
table.elim td.no { color: var(--bad); background: var(--bad-soft); }
table.elim td.yes { color: var(--good); background: var(--good-soft); font-weight: 800; }
.crypt-ans { display: flex; flex-wrap: wrap; gap: 4px; padding: 10px; background: var(--bg); border-radius: 10px; }

/* ---------- workspace: Complete Columnar ---------- */
.col-grid-wrap { overflow-x: auto; margin: 10px 0; }
.col-grid { display: inline-flex; gap: 4px; padding: 10px; background: var(--bg); border-radius: 10px; }
.col-strip { display: flex; flex-direction: column; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 4px 2px; cursor: grab; }
.col-strip.dragging { opacity: .4; }
.col-strip.over { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-soft); }
.col-head { display: flex; align-items: center; gap: 2px; font-size: .75rem; color: var(--muted); margin-bottom: 4px; }
.mini { border: 0; background: var(--surface-2); color: var(--ink-2); border-radius: 4px; font-size: .65rem; padding: 2px 4px; cursor: pointer; }
.col-cell { font: 700 1.05rem var(--mono); width: 1.8em; text-align: center; line-height: 1.5; }
.cipher-line { padding: 10px 14px; background: var(--bg); border-radius: 10px; font-size: 1.1rem; letter-spacing: .06em; margin-bottom: 8px; word-break: break-word; }
.col-readout { padding: 10px 14px; background: var(--bg); border-radius: 10px; word-break: break-all; letter-spacing: .05em; }
.col-readout mark { background: var(--hl-strong); color: var(--ink); border-radius: 3px; }

/* ---------- games ---------- */
.ggrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; margin-bottom: 18px; }
.gcard { display: flex; flex-direction: column; padding: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: var(--ink); }
.gcard:hover { border-color: var(--accent); }
.gcard p { color: var(--ink-2); font-size: .9rem; flex: 1; }
.game-box { margin-top: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 22px; text-align: center; box-shadow: var(--shadow); outline: none; }
.g-top { display: flex; justify-content: space-between; }
.g-top > div { display: flex; flex-direction: column; }
.g-clock, .g-score { font: 800 2rem var(--mono); }
.g-clock.low { color: var(--bad); }
.g-q { margin: 16px 0; min-height: 70px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; }
.g-q .big { font-size: 2.4rem; font-weight: 800; }
.g-input { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; align-items: center; }
.g-text { font: 700 1.5rem var(--mono); width: 7em; text-align: center; text-transform: uppercase; }
.g-fb { min-height: 1.6em; margin-top: 12px; font-weight: 700; }
.g-fb.good { color: var(--good); }
.g-fb.bad { color: var(--bad); }
.btn.choice { min-width: 140px; justify-content: center; }
.btn.choice .k { font-size: .75rem; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }
.morse-buf { min-height: 1.6em; width: 100%; }
table.mini-sq { border-collapse: collapse; font-size: .9rem; margin: 0 auto; }
table.mini-sq th, table.mini-sq td { border: 1px solid var(--line); padding: 3px 8px; }

/* ---------- mock test ---------- */
.setup { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; gap: 10px; align-items: flex-start; max-width: 720px; }
.setup h3 { margin: 6px 0 0; }
.tbar { position: sticky; top: 57px; z-index: 10; display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 10px 14px; margin-bottom: 14px; box-shadow: var(--shadow); }
.tclock { font-size: 1.3rem; font-weight: 800; }
.tclock.low { color: var(--bad); }
.tlayout { display: grid; grid-template-columns: 230px 1fr; gap: 14px; align-items: start; }
.tnav { display: flex; flex-direction: column; gap: 4px; position: sticky; top: 130px; max-height: calc(100vh - 150px); overflow: auto; }
.tq { display: grid; grid-template-columns: 2em 1fr auto; gap: 2px 6px; align-items: center; text-align: left; border: 1px solid var(--line); background: var(--surface);
  border-radius: 8px; padding: 6px 8px; cursor: pointer; font: .85rem var(--sans); color: var(--ink); }
.tq.on { border-color: var(--accent); background: var(--accent-soft); }
.tq.sp { box-shadow: inset 3px 0 0 var(--hl-strong); }
.tq .n { font-weight: 800; }
.tq .p { color: var(--muted); font-size: .78rem; }
.tq .bar { grid-column: 1 / -1; height: 3px; background: var(--surface-2); border-radius: 2px; overflow: hidden; }
.tq .bar i { display: block; height: 100%; background: var(--good); }
.tnext { margin-top: 12px; }
@media (max-width: 860px) {
  .tlayout { grid-template-columns: 1fr; }
  .tnav { position: static; flex-direction: row; overflow-x: auto; max-height: none; }
  .tq { min-width: 140px; }
  .tbar { top: 53px; }
}
.results { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; }
.results h2 { margin-top: 0; }

/* ---------- reference ---------- */
.refgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 14px; margin-top: 14px; }
.refbox { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; overflow: hidden; }
.fbars { display: flex; align-items: flex-end; gap: 2px; height: 120px; }
.fb { flex: 1; display: flex; flex-direction: column; align-items: center; height: 100%; justify-content: flex-end; }
.fb i { display: block; width: 100%; background: var(--accent); border-radius: 3px 3px 0 0; min-height: 1px; }
.fb span { font: .68rem var(--mono); color: var(--muted); }
.swords { display: flex; flex-wrap: wrap; gap: 4px 12px; }
.sw b { font-family: var(--mono); color: var(--accent); }
.meter { width: 120px; height: 8px; background: var(--surface-2); border-radius: 4px; overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--good); }

@media (max-width: 420px) {
  .refgrid, .cgrid { grid-template-columns: 1fr; }
  input.pt { width: 1.55em; }
  .cipher-block { gap: 8px 10px; padding: 10px; }
}

/* ---------- print (reference sheet) ---------- */
@media print {
  .topbar, .foot, .btn, .toc { display: none !important; }
  body { background: #fff; color: #000; }
  main { padding: 0; }
  .refbox, .lsec { break-inside: avoid; box-shadow: none; }
}