:root{
  --bg:#fbf6ee; --surface:#fff; --surface-2:#f5efe4; --ink:#1f2433; --muted:#6b7080; --line:#ebe2d3;
  --brand:#e5484d; --brand-ink:#fff; --sun:#f5b82e; --good:#1f9d63; --warn:#d98a00; --bad:#e5484d;
  --shadow:0 1px 2px rgba(31,36,51,.06),0 8px 24px rgba(31,36,51,.08);
  --chip-l:93%; --chip-s:85%; --band-l:62%;
  --r:22px; --nav:64px;
  --font:ui-rounded,"SF Pro Rounded","Nunito","Segoe UI",system-ui,-apple-system,Roboto,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#13151b; --surface:#1c1f27; --surface-2:#252935; --ink:#f2efe9; --muted:#9aa0ad; --line:#2d313c;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.35); --chip-l:24%; --chip-s:35%; --band-l:55%; color-scheme:dark}
}
*{box-sizing:border-box}
html,body{margin:0}
html{scroll-padding-bottom:calc(var(--nav) + 90px)}
body{background:var(--bg);color:var(--ink);font:16px/1.45 var(--font);-webkit-font-smoothing:antialiased;
  -webkit-tap-highlight-color:transparent;overscroll-behavior-y:none}
body.locked{overflow:hidden}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer;border:0;background:none;padding:0}
[hidden]{display:none!important}
.wrap{max-width:640px;margin:0 auto;padding:0 16px}
main.wrap{padding-bottom:calc(var(--nav) + env(safe-area-inset-bottom) + 24px)}

/* header */
.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);padding-top:env(safe-area-inset-top)}
.top .wrap{display:flex;align-items:center;gap:10px;height:56px}
.logo{color:inherit;text-decoration:none;display:flex;align-items:center;gap:8px;font-weight:800;font-size:19px;letter-spacing:-.01em}
.logo i{font-style:normal;display:grid;place-items:center;width:32px;height:32px;border-radius:10px;
  background:linear-gradient(180deg,#e5484d 0 33%,#f5b82e 33% 67%,#e5484d 67%);font-size:13px;color:#1f2433;font-weight:900;text-shadow:0 0 3px transparent,0 0 1px transparent}
.top .sp{flex:1}
.icon-btn{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;font-size:18px}
.icon-btn:active{background:var(--surface-2)}
h1,h2,h3{margin:0;letter-spacing:-.01em}
h2{font-size:22px}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

/* search */
.search{position:relative;margin:6px 0 12px}
.search input{width:100%;height:52px;border-radius:16px;border:1.5px solid var(--line);background:var(--surface);
  padding:0 44px 0 46px;font-size:17px;box-shadow:var(--shadow);outline:none;-webkit-appearance:none;appearance:none}
.search input:focus{border-color:var(--brand)}
.search .glass{position:absolute;left:15px;top:50%;transform:translateY(-50%);opacity:.55}
.search .clear{position:absolute;right:6px;top:6px;width:40px;height:40px;border-radius:12px;font-size:18px;color:var(--muted)}
.chips{display:flex;gap:8px;overflow-x:auto;padding:2px 0 10px;scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip-btn{flex:none;height:34px;padding:0 12px;border-radius:999px;border:1.5px solid var(--line);background:var(--surface);
  font-size:14px;font-weight:600;color:var(--muted);white-space:nowrap}
.chip-btn[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--bg)}

/* list */
.list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.row{display:flex;gap:12px;align-items:center;width:100%;text-align:left;background:var(--surface);border-radius:16px;
  padding:12px 14px;box-shadow:var(--shadow);border-left:5px solid hsl(var(--hue) 75% var(--band-l))}
.row:active{transform:scale(.99)}
.tx .w{border-radius:6px;transition:background .12s}
.tx .w.on{background:color-mix(in srgb,var(--sun) 55%,transparent)}
.row .go{flex:none;font-size:24px;line-height:1;color:var(--muted);opacity:.5;margin-right:-4px}
@media (hover:hover){
  .row:hover,.choice:hover,.tile:hover,.big-btn:hover{background:color-mix(in srgb,var(--ink) 4%,var(--surface))}
  .row:hover .go{opacity:1}
}
/* alphabet */
.abc-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}
@media (min-width:520px){.abc-grid{grid-template-columns:repeat(7,1fr)}}
.abc{position:relative;background:var(--surface);border-radius:14px;box-shadow:var(--shadow);padding:10px 4px 8px;text-align:center;min-height:74px}
.abc b{display:block;font-size:24px;line-height:1.1;font-weight:800}
.abc small{display:block;font-size:12.5px;color:var(--muted);margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.abc.flagged::after{content:"";position:absolute;top:7px;right:7px;width:7px;height:7px;border-radius:50%;background:var(--sun)}
.abc.playing{outline:2px solid var(--brand)}
.abc:active{transform:scale(.96)}
.legend{font-size:13px;color:var(--muted);margin:8px 2px 0}
.legend i{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--sun);margin-right:5px;vertical-align:middle}
.say-row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
.say-row:last-child{border-bottom:0}
.say-row .t{flex:1;min-width:0}
.say-row b{display:block}
.say-row small{color:var(--muted)}
.say-row .char{font-size:26px;font-weight:800;width:40px;text-align:center;flex:none}
.spell-box{display:flex;gap:8px}
.spell-box input{flex:1;min-width:0;height:48px;border-radius:14px;border:1.5px solid var(--line);background:var(--surface);padding:0 14px;font-size:17px;outline:none}
.spell-box input:focus{border-color:var(--brand)}
.spellout{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.spellout span{display:flex;flex-direction:column;align-items:center;min-width:44px;padding:6px 8px;border-radius:12px;background:var(--surface-2);transition:background .15s,transform .15s}
.spellout span b{font-size:22px;line-height:1.1}
.spellout span small{font-size:12px;color:var(--muted);white-space:nowrap}
.spellout span.gap{min-width:14px;background:none;padding:0}
.spellout span.on{background:color-mix(in srgb,var(--brand) 22%,var(--surface));transform:translateY(-2px)}
.letter-big{font-size:64px;font-weight:900;line-height:1;margin:4px 0 6px}
.alt{background:var(--surface-2);border-radius:14px;padding:10px 12px;margin-top:10px;font-size:14.5px}
.alt p{margin:4px 0 0;color:var(--muted)}

/* one-time tips */
.tip{display:flex;align-items:center;gap:10px;background:var(--ink);color:var(--bg);border-radius:14px;padding:10px 10px 10px 14px;
  font-size:14px;font-weight:600;line-height:1.35;box-shadow:var(--shadow);margin:0 0 10px;animation:up .25s ease}
.tip span{flex:1}
.tip button{flex:none;background:color-mix(in srgb,var(--bg) 20%,transparent);color:inherit;border-radius:10px;padding:7px 11px;font-weight:800;font-size:13.5px}
.tip-slot{max-width:640px;margin:0 auto;width:100%;padding:0 16px}
.tip-slot .tip{margin:8px 0 0}
@keyframes peek{20%{transform:translateX(-26px) rotate(-1.5deg)}40%{transform:none}60%{transform:translateX(26px) rotate(1.5deg)}80%{transform:none}}
.peek{animation:peek 1.6s ease-in-out .5s 2}
.row .t{flex:1;min-width:0}
.row .tx{font-weight:700;font-size:16.5px}
.row .en{color:var(--muted);font-size:14.5px}
mark{background:color-mix(in srgb,var(--sun) 55%,transparent);color:inherit;border-radius:4px;padding:0 1px}
.count{font-size:13px;color:var(--muted);margin:4px 2px 10px}
.empty{text-align:center;color:var(--muted);padding:40px 12px}
.empty b{display:block;font-size:40px;margin-bottom:6px}
.sub{margin:18px 2px 8px;font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.07em}

/* home */
.hello{margin:6px 2px 14px}
.hello h2{font-size:26px}
.hello p{margin:2px 0 0;color:var(--muted)}
.lead{color:var(--muted);margin:4px 2px 12px}
.choices{display:flex;flex-direction:column;gap:10px}
.choice{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--surface);border-radius:18px;padding:16px;box-shadow:var(--shadow)}
.choice>span{font-size:28px;width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:var(--surface-2);flex:none}
.choice div{flex:1}
.choice b{display:block;font-size:17px}
.choice small{color:var(--muted);font-size:14px}
.choice i{font-style:normal;font-size:26px;color:var(--muted)}
.choice:active{transform:scale(.98)}
a.choice{text-decoration:none;color:inherit}
.choice[aria-current]{border:2px solid var(--brand);box-shadow:none}
.choice[aria-current] i{font-size:12px;font-weight:700;color:var(--brand)}
.lang-btn{font-size:22px}
.more{display:flex;justify-content:center;align-items:center;gap:8px;margin:22px 0 4px;font-size:14px;color:var(--muted)}
.more button,.more a{color:var(--ink);font-weight:700;text-decoration:none}
.btn{height:48px;border-radius:14px;padding:0 18px;font-weight:700;background:var(--surface-2);display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn.primary{background:var(--brand);color:var(--brand-ink);box-shadow:0 6px 16px color-mix(in srgb,var(--brand) 35%,transparent)}
.btn.good{background:var(--good);color:#fff}
.btn.block{width:100%}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.45}

/* topics */
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
@media (min-width:520px){.grid{grid-template-columns:repeat(3,1fr)}}
.tile{background:var(--surface);border-radius:18px;padding:14px;box-shadow:var(--shadow);text-align:left;min-height:96px;gap:8px;
  display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.tile .em{font-size:30px;position:relative;z-index:1}
.tile b{font-size:15px;line-height:1.2}
.tile small{color:var(--muted);font-size:12.5px}
.tile:active{transform:scale(.98)}
.topic-head{display:flex;align-items:center;gap:10px;margin:4px 0 12px}
.topic-head .em{font-size:36px;width:56px;height:56px;border-radius:18px;display:grid;place-items:center;background:hsl(var(--hue) var(--chip-s) var(--chip-l))}
.actions{display:flex;gap:8px;margin:0 0 8px}
.actions .btn{flex:1}

/* card */
.card{background:var(--surface);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden;position:relative}
.card .band{height:8px;background:linear-gradient(90deg,hsl(var(--hue) 80% var(--band-l)),hsl(calc(var(--hue) + 40) 85% var(--band-l)))}
.card .in{padding:18px 20px 20px}
.card .meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.tag{display:inline-flex;align-items:center;gap:5px;height:28px;padding:0 10px;border-radius:999px;font-size:12.5px;font-weight:700;
  background:hsl(var(--hue) var(--chip-s) var(--chip-l))}
.tag.plain{background:var(--surface-2);color:var(--muted)}
.card .tx{font-size:clamp(26px,7.4vw,36px);line-height:1.15;font-weight:800;margin:10px 0 6px;letter-spacing:-.015em}
.card .ph{font-size:15px;color:var(--muted);margin:0 0 14px;font-weight:600;letter-spacing:.01em}
.card .ph b{color:var(--ink)}
.card .en{font-size:19px;margin:0 0 14px;font-weight:600}
.card .note{border-top:1px solid var(--line);padding-top:12px;font-size:15px;margin:0;color:var(--muted)}
.card .kicker{font-size:13px;font-weight:700;color:var(--muted)}
.card .tools{display:flex;gap:8px;margin-top:14px}
.tool{height:44px;min-width:44px;padding:0 14px;border-radius:14px;background:var(--surface-2);font-weight:700;font-size:14px;display:inline-flex;align-items:center;gap:6px}
.tool.on{background:color-mix(in srgb,var(--sun) 35%,var(--surface))}
.tool:active{transform:scale(.96)}
.tool.spk{background:var(--brand);color:#fff}
.covered{position:relative;cursor:pointer}
.covered>*{filter:blur(9px);opacity:.6;user-select:none}
.covered::after{content:"Tap to reveal";position:absolute;inset:0;display:grid;place-items:center;font-size:13px;font-weight:700;color:var(--muted)}
.quiet.covered::after{content:none}

/* overlays */
.overlay{position:fixed;inset:0;z-index:20;background:var(--bg);display:flex;flex-direction:column;
  padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom);animation:up .22s ease}
@keyframes up{from{transform:translateY(24px);opacity:0}}
.ov-top{display:flex;align-items:center;gap:8px;height:56px;padding:0 10px;max-width:640px;margin:0 auto;width:100%}
.ov-top .title{flex:1;text-align:center;font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.stage{flex:1;min-height:0;position:relative;touch-action:pan-y;max-width:640px;margin:0 auto;width:100%;padding:4px 16px}
.stage .card{max-height:100%;overflow-y:auto;will-change:transform;user-select:none;-webkit-user-select:none}
.ov-bottom{display:flex;align-items:center;gap:10px;padding:10px 16px 12px;max-width:640px;margin:0 auto;width:100%}
.nav-btn{width:56px;height:56px;border-radius:18px;background:var(--surface);box-shadow:var(--shadow);font-size:24px;font-weight:700}
.nav-btn:disabled{opacity:.35}
.ov-bottom .mid{flex:1;display:flex;justify-content:center;gap:8px}
/* an explicit width stops the flex parent stretching it, so the auto margins can centre
   it over the question like everything else in the overlay */
.progress{height:6px;background:var(--line);border-radius:6px;overflow:hidden;margin:0 auto;width:calc(100% - 32px);max-width:608px}
.progress i{display:block;height:100%;background:var(--brand);border-radius:6px;transition:width .3s}
.cover-seg{display:grid;grid-template-columns:auto 1fr auto;gap:4px;padding:4px;margin:0 16px 10px;border-radius:14px;background:var(--surface-2);
  max-width:608px;width:calc(100% - 32px);align-self:center}
.cover-seg button{height:36px;border-radius:10px;font-size:14px;font-weight:700;color:var(--muted);white-space:nowrap;padding:0 10px}
.narrow-only{display:none}
@media (max-width:380px){.cover-seg button{font-size:13px;padding:0 7px}}
@media (max-width:340px){.cover-seg button{font-size:12.5px;padding:0 6px}.wide-only{display:none}.narrow-only{display:inline}}
.cover-seg button[aria-pressed="true"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.side-tabs{position:sticky;top:calc(56px + env(safe-area-inset-top));z-index:4;background:var(--bg);padding:4px 0 8px;margin-bottom:4px}
.side-tabs .cover-seg{margin:0;width:100%;grid-template-columns:1fr 1fr}
.side-tabs .cover-seg button{height:40px;font-size:15px}
.side-tabs small{font-weight:600;opacity:.6;margin-left:2px}
.hint{text-align:center;color:var(--muted);font-size:12.5px;margin:0 0 2px}
@keyframes nudge{20%{transform:translateX(-10px)}40%{transform:translateX(8px)}60%{transform:translateX(-5px)}80%{transform:translateX(3px)}}
.nudge{animation:nudge .35s}

/* practice */
.panel{background:var(--surface);border-radius:20px;padding:16px;box-shadow:var(--shadow);margin-bottom:12px}
.panel h3{font-size:15px;margin-bottom:10px}
.seg{display:grid;gap:8px}
.seg.two{grid-template-columns:1fr 1fr}
.seg.three{grid-template-columns:repeat(3,1fr)}
.opt{border:1.5px solid var(--line);border-radius:14px;padding:9px 12px;text-align:left;background:var(--surface)}
.opt b{display:block;font-size:15px}
.opt small{color:var(--muted);font-size:12.5px}
.opt[aria-pressed="true"]{border-color:var(--brand);background:color-mix(in srgb,var(--brand) 9%,var(--surface))}
.opt.c{text-align:center;font-weight:700}
select{width:100%;height:48px;border-radius:14px;border:1.5px solid var(--line);background:var(--surface);padding:0 12px;font-weight:600}
.start-bar{position:sticky;bottom:calc(var(--nav) + env(safe-area-inset-bottom) + 10px);padding-top:4px}
.q-wrap{flex:1;min-height:0;overflow-y:auto;max-width:640px;margin:0 auto;width:100%;padding:12px 16px}
.prompt{background:var(--surface);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden;min-height:240px;display:flex;flex-direction:column}
.prompt .in{flex:1;display:flex;flex-direction:column;justify-content:center;padding:22px 20px;text-align:center;gap:10px}
.prompt .lang{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.prompt .big{font-size:clamp(26px,7.6vw,36px);font-weight:800;line-height:1.15}
.prompt .tapme{color:var(--muted);font-size:13px}
.flip-out{transform:scaleX(0)!important;transition:transform .14s ease-in!important}
.flip-in{animation:flipin .16s ease-out}
@keyframes flipin{from{transform:scaleX(0)}}
.answer-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.answer-row .btn{height:58px;font-size:16px}
.btn.bad{background:color-mix(in srgb,var(--bad) 14%,var(--surface));color:var(--bad)}
.btn.ok{background:color-mix(in srgb,var(--good) 16%,var(--surface));color:var(--good)}
.type-box{margin-top:14px}
.type-box textarea{width:100%;min-height:88px;border-radius:16px;border:2px solid var(--line);background:var(--surface);padding:12px 14px;
  font:600 20px/1.3 var(--font);resize:none;outline:none}
.type-box textarea:focus{border-color:var(--brand)}
.keys{display:flex;gap:6px;margin:8px 0;flex-wrap:wrap}
.keys button{min-width:40px;height:40px;border-radius:12px;background:var(--surface);box-shadow:var(--shadow);font-weight:700;font-size:18px}
.fb{border-radius:16px;padding:12px 14px;margin-top:12px;font-weight:600}
.fb.right{background:color-mix(in srgb,var(--good) 15%,var(--surface));color:var(--good)}
.fb.close{background:color-mix(in srgb,var(--warn) 16%,var(--surface));color:var(--warn)}
.fb.wrong{background:color-mix(in srgb,var(--bad) 13%,var(--surface));color:var(--bad)}
.fb .ans{color:var(--ink);font-size:20px;font-weight:800;margin-top:4px}
.w-ok{color:var(--good)} .w-acc{color:var(--warn);text-decoration:underline wavy} .w-miss{color:var(--bad);text-decoration:underline}
.result{text-align:center;padding:24px 8px}
.result .emoji{font-size:64px}
.result .score{font-size:44px;font-weight:900;margin:4px 0}
.ring{display:flex;justify-content:center;gap:16px;margin:10px 0 18px;font-weight:700}
.ring span{display:flex;flex-direction:column;font-size:24px}
.ring small{font-size:12px;color:var(--muted);font-weight:600}

/* bottom nav */
.tabs{position:fixed;left:0;right:0;bottom:0;z-index:10;background:color-mix(in srgb,var(--surface) 92%,transparent);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom)}
.tabs .wrap{display:grid;grid-template-columns:repeat(4,1fr);height:var(--nav)}
.tab{text-decoration:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:11.5px;font-weight:700;color:var(--muted)}
.tab span{font-size:22px;filter:grayscale(1);opacity:.7;transition:transform .15s}
.tab[aria-current="page"]{color:var(--ink)}
.tab[aria-current="page"] span{filter:none;opacity:1;transform:translateY(-1px) scale(1.1)}

/* sheet + toast */
.sheet{position:fixed;inset:0;z-index:30;background:rgba(0,0,0,.4);display:flex;align-items:flex-end;justify-content:center}
.sheet>div{background:var(--surface);width:100%;max-width:640px;border-radius:24px 24px 0 0;padding:20px 20px calc(20px + env(safe-area-inset-bottom));
  max-height:85vh;overflow:auto;animation:up .2s ease}
.sheet h3{margin-bottom:8px}
.sheet table{width:100%;border-collapse:collapse;font-size:15px;margin:8px 0}
.sheet td{padding:6px 4px;border-bottom:1px solid var(--line);vertical-align:top}
.sheet td:first-child{font-weight:800;width:28%;padding-right:10px}
.icons{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 16px}
.icons button{width:46px;height:46px;border-radius:14px;font-size:24px;background:var(--surface);border:2px solid var(--line)}
.icons button[aria-pressed="true"]{border-color:var(--brand);background:color-mix(in srgb,var(--brand) 12%,var(--surface))}
.toast{position:fixed;left:50%;bottom:calc(var(--nav) + 20px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:40;
  background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:12px;font-weight:600;font-size:14px;box-shadow:var(--shadow);animation:up .2s}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* sentence builder (src/sentence-builder.js) — used in practice and on the course pages */
.sb-prompt{font-size:17px;font-weight:600;margin:0 0 12px;text-align:center}
/* Ruled lines for the words to sit on. The row pitch and the gradient period have to be
   the same number, or later rows drift off their rule: a 44px tile, 5px clear of a 2px
   rule, 6px under it = a 57px row, so the flex row-gap is 57 - 44. */
.sb-line{--rule:var(--line);
  display:flex;flex-wrap:wrap;align-content:flex-start;gap:13px 8px;min-height:114px;margin-top:6px;
  background-image:repeating-linear-gradient(to bottom,transparent 0 49px,var(--rule) 49px 51px,transparent 51px 57px)}
.sb-line.right{--rule:var(--good)}
.sb-line.wrong{--rule:var(--bad)}
.sb-empty{color:var(--muted);font-size:14px;align-self:flex-start;line-height:44px}
.sb-bank{display:flex;flex-wrap:wrap;gap:8px;min-height:44px;margin:16px 0 4px;padding-top:14px;border-top:1px solid var(--line)}
.sb-tile{height:44px;padding:0 14px;border-radius:12px;background:var(--surface);box-shadow:var(--shadow);
  border:1.5px solid var(--line);font-weight:700;font-size:17px;line-height:42px}
.sb-tile:active{transform:translateY(1px)}
.sb-tile.gone{visibility:hidden}
.sb-tile:disabled{opacity:1}
.sb-tools{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:14px}
.sb-tools .btn{height:52px}
.sb-say{margin-top:10px}
.q-kicker{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);text-align:center;margin:2px 0 12px}
/* the Check button stays clearly inert until a word has been placed */
.sb-tools .btn.primary:disabled{background:var(--surface-2);color:var(--muted);box-shadow:none;opacity:1}

/* Course pages only (dist/<code>/course/…). Loaded after base.css, which supplies the
   colours, buttons, cards, overlays and the sentence builder. */

.crumb{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);margin:10px 2px 6px;flex-wrap:wrap}
.crumb a{color:inherit;text-decoration:none;font-weight:600}
.crumb a:hover{text-decoration:underline}
.crumb b{color:var(--ink)}

.page-head{margin:2px 2px 16px}
.page-head h1{font-size:28px;line-height:1.15;letter-spacing:-.02em;margin:0}
.page-head .lede{color:var(--muted);margin:8px 0 0;font-size:15.5px}
.badges{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 10px}
.badge{display:inline-flex;align-items:center;gap:5px;height:26px;padding:0 10px;border-radius:999px;font-size:12px;font-weight:700;
  background:var(--surface-2);color:var(--muted)}
.badge.core{background:color-mix(in srgb,var(--brand) 16%,var(--surface));color:var(--brand)}
.badge.active{background:color-mix(in srgb,var(--good) 16%,var(--surface));color:var(--good)}
.badge.hue{background:hsl(var(--hue) var(--chip-s) var(--chip-l));color:var(--ink)}

/* level and section cards */
/* the bottom margin collapses with a following .sub (18px), so it only shows itself
   where a card list runs straight into a panel */
.card-list{display:flex;flex-direction:column;gap:10px;margin-bottom:14px}
#continue{margin-bottom:14px}
.card-link{display:flex;align-items:center;gap:14px;background:var(--surface);border-radius:18px;padding:14px 16px;box-shadow:var(--shadow);
  text-decoration:none;color:inherit;border-left:5px solid hsl(var(--hue,210) 75% var(--band-l))}
.card-link:active{transform:scale(.99)}
.card-link .n{flex:none;width:34px;height:34px;border-radius:11px;display:grid;place-items:center;font-weight:800;font-size:14px;
  background:hsl(var(--hue,210) var(--chip-s) var(--chip-l))}
.card-link .t{flex:1;min-width:0}
.card-link b{display:block;font-size:16px;line-height:1.25}
.card-link small{color:var(--muted);font-size:13px}
.card-link .go{flex:none;font-size:24px;color:var(--muted);opacity:.5}
.card-link.done .n{background:var(--good);color:#fff}
@media (hover:hover){.card-link:hover{background:color-mix(in srgb,var(--ink) 4%,var(--surface))}.card-link:hover .go{opacity:1}}

/* progress */
/* both of these sit inside a <span> on the cards, so they have to be made blocks */
.bar{display:block;height:8px;border-radius:8px;background:var(--line);overflow:hidden;margin:6px 0}
.bar i{display:block;height:100%;background:var(--good);border-radius:8px;transition:width .3s}
.pct{display:block;font-size:13px;color:var(--muted)}

/* patterns, examples and reference */
.pattern{display:flex;align-items:center;gap:10px;padding:11px 0;border-bottom:1px solid var(--line)}
.pattern:last-child{border-bottom:0}
.pattern .t{flex:1;min-width:0}
.pattern .form{font-weight:700;font-size:16.5px}
.pattern .mean{color:var(--muted);font-size:14px}
.pattern .ph{color:var(--muted);font-size:13px;font-weight:600}
.pattern .ph b{color:var(--ink)}

.ex{padding:12px 0;border-bottom:1px solid var(--line);display:flex;gap:10px;align-items:flex-start}
.ex:last-child{border-bottom:0}
.ex .t{flex:1;min-width:0}
.ex .es{font-weight:700;font-size:17px}
.ex .en{color:var(--muted);font-size:14.5px;margin-top:2px}
.ex .ph{color:var(--muted);font-size:13px;font-weight:600;margin-top:2px}
.ex .ph b{color:var(--ink)}
.ex .tools{display:flex;gap:6px;flex:none}

.tbl{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:2px -4px;padding:0 4px}
.tbl table{border-collapse:collapse;font-size:15px;min-width:100%}
.tbl th,.tbl td{padding:7px 10px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
.tbl th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700}
.tbl tbody th{text-transform:none;letter-spacing:0;font-size:15px;color:var(--ink);font-weight:800}
.tbl tr:last-child td,.tbl tr:last-child th{border-bottom:0}

.wordlist{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 0}
.word{display:inline-flex;align-items:center;height:32px;padding:0 11px;border-radius:999px;background:var(--surface-2);font-size:14.5px;font-weight:600}
.ref-key{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:14px 0 4px}
.ref-key:first-child{margin-top:0}
.ref-note{margin:4px 0 0;font-size:15px}

.pair{display:flex;align-items:center;gap:8px;padding:9px 0;border-bottom:1px solid var(--line)}
.pair:last-child{border-bottom:0}
.pair b{font-size:17px}
.pair .vs{color:var(--muted);font-size:13px;flex:none}

/* common mistakes */
.miss{border-radius:14px;background:var(--surface-2);padding:12px 14px;margin-bottom:8px}
.miss:last-child{margin-bottom:0}
.miss .no{color:var(--bad);text-decoration:line-through;text-decoration-color:color-mix(in srgb,var(--bad) 50%,transparent);font-weight:600}
.miss .yes{color:var(--good);font-weight:800;font-size:16.5px;margin-top:3px}
.miss p{margin:6px 0 0;font-size:14px;color:var(--muted)}

/* the tabs on a section page — radio inputs, so they work with no JavaScript */
.tabset{margin:2px 0 0}
.tab-in{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.tab-bar{position:sticky;top:calc(56px + env(safe-area-inset-top));z-index:4;display:grid;gap:4px;padding:4px;margin:0 0 14px;
  border-radius:14px;background:var(--surface-2);grid-auto-flow:column;grid-auto-columns:minmax(0,1fr)}
.tab-bar label{display:flex;align-items:center;justify-content:center;gap:5px;height:38px;border-radius:10px;cursor:pointer;
  font-size:13px;font-weight:700;color:var(--muted);white-space:nowrap;overflow:hidden;padding:0 4px}
/* the words carry it on a phone; the icons only earn their space once there's room */
.tab-bar label span{display:none;font-size:15px}
@media (min-width:520px){.tab-bar label{font-size:14px}.tab-bar label span{display:inline}}
.pane{display:none}
#pane-learn:checked ~ [data-pane="learn"],
#pane-ex:checked ~ [data-pane="ex"],
#pane-ref:checked ~ [data-pane="ref"],
#pane-do:checked ~ [data-pane="do"]{display:block}
#pane-learn:checked ~ .tab-bar label[for="pane-learn"],
#pane-ex:checked ~ .tab-bar label[for="pane-ex"],
#pane-ref:checked ~ .tab-bar label[for="pane-ref"],
#pane-do:checked ~ .tab-bar label[for="pane-do"]{background:var(--surface);color:var(--ink);box-shadow:var(--shadow)}
.tab-in:focus-visible ~ .tab-bar label[for]{outline:none}
#pane-learn:focus-visible ~ .tab-bar label[for="pane-learn"],
#pane-ex:focus-visible ~ .tab-bar label[for="pane-ex"],
#pane-ref:focus-visible ~ .tab-bar label[for="pane-ref"],
#pane-do:focus-visible ~ .tab-bar label[for="pane-do"]{outline:2px solid var(--brand);outline-offset:1px}
.pane>.sub:first-child{margin-top:4px}

/* where a section has got to */
.pill{display:inline-flex;align-items:center;height:24px;padding:0 9px;border-radius:999px;font-size:11.5px;font-weight:800;
  letter-spacing:.02em;white-space:nowrap;flex:none}
.pill.ok{background:color-mix(in srgb,var(--good) 18%,var(--surface));color:var(--good)}
.pill.mid{background:color-mix(in srgb,var(--warn) 20%,var(--surface));color:var(--warn)}
.card-link[data-state="refreshed"] .n{background:var(--good);color:#fff}
.card-link.planned{opacity:.6}
.card-link.planned .go{display:none}

/* "can you do this?" — the syllabus checkpoints, as a prompt rather than a checklist */
.can{margin:0;padding:0 0 0 20px}
.can li{margin:5px 0;font-size:15px}

/* practice prompts */
.prompt-row{padding:11px 0;border-bottom:1px solid var(--line)}
.prompt-row:last-child{border-bottom:0}
.prompt-row .kind{font-size:11.5px;font-weight:800;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.prompt-row b{display:block;font-weight:600;font-size:15.5px;margin:2px 0}
.prompt-row details{margin-top:4px}
.prompt-row summary{font-size:13.5px;color:var(--brand);font-weight:700;cursor:pointer;list-style:none}
.prompt-row summary::-webkit-details-marker{display:none}
.prompt-row details p{margin:6px 0 0;font-size:14.5px;color:var(--muted)}


/* section nav */
.updown{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:18px 0 0}
.updown a{display:flex;flex-direction:column;gap:2px;background:var(--surface);border-radius:16px;padding:12px 14px;box-shadow:var(--shadow);
  text-decoration:none;color:inherit;min-height:66px;justify-content:center}
.updown a.next{text-align:right;align-items:flex-end}
.updown small{color:var(--muted);font-size:12.5px}
.updown b{font-size:14.5px;line-height:1.25}
.updown span.spacer{display:block}

/* course search */
.hit{display:block;background:var(--surface);border-radius:14px;padding:11px 14px;box-shadow:var(--shadow);text-decoration:none;color:inherit}
.hit b{display:block;font-size:15.5px}
.hit small{color:var(--muted);font-size:13px}

.foot{margin:26px 0 8px;padding-top:16px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
.foot a{color:inherit;font-weight:700}
.foot p{margin:4px 0}

/* The app's nav is always four tabs; the course grows one per level, so lay it out
   flexibly — adding A2 shouldn't need a CSS change. */
.tabs .wrap{display:flex;grid-template-columns:none}
.tabs .tab{flex:1;min-width:0;padding:0 2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}