/* Redesign prototype v2 — "Focus + Bento": calm editorial base (warm paper, serif headlines, one indigo accent) with soft bento tiles.
   Phone column first; side rail from 960px.  No frameworks.  v1 (blue/system-font) is kept in v1_previous/. */
:root{
  --bg:#f6f4ef; --surface:#fff; --surface-2:#f1eee7; --ink:#16181d; --muted:#5f6470; --line:#e3dfd5;
  --brand:#3d3df0; --brand-d:#2b2bc9; --brand-50:#e8e8ff; --brand-100:#d6d6fb;
  --ok:#1f7a4d; --ok-50:#e3f4ea; --bad:#b42318; --bad-50:#fdecea; --warn:#8a5a00; --warn-50:#fff1c2;
  --t-violet:#e8e8ff; --t-sun:#fff1c2; --t-mint:#ddf3e6; --t-peach:#ffe9da; --t-white:#fff;
  --btn:#16181d; --btn-fg:#fff;
  --r-s:12px; --r-m:22px; --r-l:28px;
  --sh-1:none; --sh-2:0 12px 36px rgba(22,24,29,.16); --sh-nav:0 8px 28px rgba(22,24,29,.12);
  --tab-h:70px; --pad:16px; --rail:92px;
  --font:"DM Sans",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --serif:"Fraunces",Georgia,"Times New Roman",serif;
  color-scheme:light;
}
:root[data-theme=dark]{
  --bg:#14151a; --surface:#1e2027; --surface-2:#252832; --ink:#f2f1ed; --muted:#a3a7b3; --line:#2d3039;
  --brand:#9a9aff; --brand-d:#b4b4ff; --brand-50:#25264a; --brand-100:#33346a;
  --ok:#5fd39a; --ok-50:#14301f; --bad:#ff8b80; --bad-50:#3a1d1b; --warn:#f2c24a; --warn-50:#3a3216;
  --t-violet:#25264a; --t-sun:#3a3216; --t-mint:#14301f; --t-peach:#3a2619; --t-white:#1e2027;
  --btn:#f2f1ed; --btn-fg:#14151a; --sh-2:0 12px 36px rgba(0,0,0,.5); --sh-nav:0 8px 28px rgba(0,0,0,.5); color-scheme:dark;
}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){
  --bg:#14151a; --surface:#1e2027; --surface-2:#252832; --ink:#f2f1ed; --muted:#a3a7b3; --line:#2d3039;
  --brand:#9a9aff; --brand-d:#b4b4ff; --brand-50:#25264a; --brand-100:#33346a;
  --ok:#5fd39a; --ok-50:#14301f; --bad:#ff8b80; --bad-50:#3a1d1b; --warn:#f2c24a; --warn-50:#3a3216;
  --t-violet:#25264a; --t-sun:#3a3216; --t-mint:#14301f; --t-peach:#3a2619; --t-white:#1e2027;
  --btn:#f2f1ed; --btn-fg:#14151a; --sh-2:0 12px 36px rgba(0,0,0,.5); --sh-nav:0 8px 28px rgba(0,0,0,.5); color-scheme:dark}}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.55 var(--font);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
h1,h2,h3{line-height:1.12;margin:0;font-family:var(--serif);font-weight:500;letter-spacing:-.015em}
p{margin:0 0 .8em}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:8px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.ico{width:24px;height:24px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none}
.ico.s{width:18px;height:18px}.ico.l{width:30px;height:30px}
.eb{font-size:.74rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}

/* ---------- shell ---------- */
.app{min-height:100dvh;padding-bottom:calc(var(--tab-h) + env(safe-area-inset-bottom) + 34px)}
.app.focus{padding-bottom:calc(290px + env(safe-area-inset-bottom))}
.app.lesson{padding-bottom:calc(var(--tab-h) + 120px + env(safe-area-inset-bottom))}
.wrap{max-width:720px;margin:0 auto;padding:0 var(--pad)}
.top{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid transparent}
.top.scrolled{border-bottom-color:var(--line)}
.top .wrap{display:flex;align-items:center;gap:10px;height:58px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:500;text-decoration:none;font-size:1.2rem;letter-spacing:-.01em}
.logo{width:34px;height:34px;border-radius:12px;background:var(--ink);color:var(--bg);display:grid;place-items:center}
.sp{flex:1}
.iconbtn{width:44px;height:44px;border-radius:50%;border:0;background:transparent;display:grid;place-items:center;text-decoration:none}
.iconbtn:hover{background:var(--surface)}
.lang{position:relative}
.langbtn{height:40px;padding:0 14px;border-radius:999px;border:0;background:var(--surface);display:flex;align-items:center;gap:6px;font-weight:700;font-size:.9rem}
.langmenu{position:absolute;right:0;top:46px;background:var(--surface);border:1px solid var(--line);border-radius:20px;box-shadow:var(--sh-2);padding:6px;display:none;min-width:160px}
.langmenu.open{display:block}
.langmenu a{display:flex;justify-content:space-between;gap:12px;padding:10px 12px;border-radius:14px;text-decoration:none;font-weight:600}
.langmenu a:hover,.langmenu a[aria-current]{background:var(--brand-50);color:var(--brand)}

/* floating pill tab bar */
.tabs{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(14px + env(safe-area-inset-bottom));z-index:30;display:flex;gap:2px;padding:6px;border-radius:999px;background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);box-shadow:var(--sh-nav)}
.tab{width:62px;height:50px;border-radius:999px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;text-decoration:none;color:var(--muted);font-size:.64rem;font-weight:700}
.tab .ico{width:21px;height:21px}
.tab[aria-current=page]{background:var(--ink);color:var(--bg)}
@media(max-width:380px){.tab{width:56px}}
@media(min-width:960px){
  .app{padding-left:var(--rail);padding-bottom:48px}
  .app.lesson{padding-bottom:110px}
  .app.focus{padding-bottom:190px}
  .tabs{top:0;bottom:0;left:0;transform:none;width:var(--rail);flex-direction:column;justify-content:flex-start;gap:6px;padding:18px 0;border-radius:0;border:0;border-right:1px solid var(--line);background:var(--bg);box-shadow:none;align-items:center}
  .tab{width:68px;height:62px;border-radius:20px}
  .top .wrap,.wrap{max-width:760px}
}

/* ---------- primitives ---------- */
.card{background:var(--surface);border:0;border-radius:var(--r-l);box-shadow:var(--sh-1)}
.pad{padding:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:54px;padding:0 24px;border-radius:999px;border:0;background:var(--btn);color:var(--btn-fg);font-weight:700;font-size:1rem;text-decoration:none;transition:transform .08s,opacity .15s}
.btn:active{transform:scale(.98)}.btn:hover{opacity:.9}
.btn.block{width:100%}
.btn.light{background:#fff;color:#16181d}
.btn.ghost{background:var(--surface);color:var(--ink)}
.btn.line{background:transparent;border:1.5px solid var(--line);color:var(--ink)}
.pill{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:999px;background:var(--surface);color:var(--ink);font-weight:700;font-size:.78rem}
.pill.ok{background:var(--ok-50);color:var(--ok)}.pill.bad{background:var(--bad-50);color:var(--bad)}.pill.warn{background:var(--warn-50);color:var(--warn)}
.bar{height:7px;border-radius:99px;background:var(--line);overflow:hidden}
.bar>i{display:block;height:100%;border-radius:99px;background:var(--ink)}
.sec{margin:30px 0 12px;display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.sec h2{font-size:1.45rem}
.sec a{font-weight:700;font-size:.9rem;color:var(--brand);text-decoration:none}
.muted{color:var(--muted)}
.chips{display:flex;gap:8px;overflow-x:auto;scroll-snap-type:x proximity;scroll-padding:0 var(--pad);padding:2px var(--pad) 8px;margin:0 calc(var(--pad) * -1);scrollbar-width:none}
.chips::-webkit-scrollbar{display:none}
.chip{scroll-snap-align:start;flex:none;padding:9px 15px;border-radius:999px;background:var(--surface);font-weight:600;font-size:.9rem;text-decoration:none;white-space:nowrap;color:var(--muted)}
.chip[aria-current]{background:var(--ink);color:var(--bg)}

/* ---------- home (bento) ---------- */
.hello{padding:16px 0 18px}
.hello .g{margin:0 0 8px;color:var(--muted);font-weight:500;font-size:.95rem}
.hello h1{font-size:clamp(2rem,9vw,2.6rem)}
.cont{border-radius:var(--r-l);padding:20px;color:#fff;background:#16181d;display:grid;grid-template-columns:1fr 96px;gap:14px;align-items:center;position:relative;overflow:hidden}
:root[data-theme=dark] .cont{background:#2a2c38}
.cont .k{font-size:.74rem;font-weight:700;opacity:.65;text-transform:uppercase;letter-spacing:.07em}
.cont h2{font-size:1.75rem;margin:6px 0 6px}
.cont .meta{font-size:.9rem;opacity:.75;margin-bottom:14px}
.cont .bar{background:rgba(255,255,255,.2);height:5px}.cont .bar>i{background:#fff}
.cont .thumb{width:96px;height:96px;border-radius:22px;object-fit:cover;background:#fff}
.cont .btn{grid-column:1/-1;margin-top:2px}
.bento{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.tile{border-radius:var(--r-l);padding:18px;text-decoration:none;display:block}
.t-violet{background:var(--t-violet)}.t-sun{background:var(--t-sun)}.t-mint{background:var(--t-mint)}.t-peach{background:var(--t-peach)}.t-white{background:var(--t-white)}
.span2{grid-column:span 2}
.ready .ring{width:96px;height:96px;margin:12px 0 10px}
.ready .ring b{font-family:var(--serif);font-weight:500;font-size:1.5rem}
.ready small{display:block;color:var(--muted);font-weight:500;font-size:.84rem;line-height:1.35}
.stack{display:grid;gap:12px;grid-template-rows:1fr 1fr}
.tile.row{display:flex;align-items:center;gap:12px;padding:14px 16px}
.tile.row b{display:block;font-family:var(--serif);font-weight:500;font-size:1.6rem;line-height:1}
.tile.row b i{font-style:normal;font-family:var(--font);font-size:.8rem;color:var(--muted)}
.tile.row small{color:var(--muted);font-weight:600;font-size:.76rem}
.t-sun .ico{color:#e8590c}.t-mint .ico{color:var(--ok)}
.weak .hd{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.weak .hd a{font-weight:700;font-size:.9rem;color:var(--brand);text-decoration:none}
.wk{display:grid;grid-template-columns:1fr 84px 38px;gap:12px;align-items:center;padding:9px 0;font-weight:600;font-size:.98rem}
.wk .bar>i{background:var(--brand)}.wk em{font-style:normal;text-align:right;color:var(--muted);font-size:.85rem;font-weight:600}
.ring{position:relative;width:118px;height:118px}
.ring svg{width:100%;height:100%;transform:rotate(-90deg)}
.ring .t{position:absolute;inset:0;display:grid;place-content:center;text-align:center}
.ring b{font-size:1.9rem;line-height:1}.ring small{color:var(--muted);font-weight:700;font-size:.72rem}
.qa{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.qa a{padding:16px;display:grid;gap:10px;text-decoration:none;min-height:116px;align-content:space-between}
.qa .ic{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--brand-50);color:var(--brand)}
.qa .ic.r{background:var(--bad-50);color:var(--bad)}.qa .ic.g{background:var(--ok-50);color:var(--ok)}.qa .ic.w{background:var(--warn-50);color:var(--warn)}
.qa b{display:block;font-size:1.02rem}.qa span{color:var(--muted);font-size:.84rem}
.lrow{display:grid;grid-template-columns:60px 1fr auto;gap:14px;align-items:center;padding:12px;text-decoration:none}
.lrow+.lrow{margin-top:10px}
.lrow img{width:60px;height:60px;border-radius:18px;object-fit:cover;background:var(--surface-2)}
.lrow b{display:block;font-size:1.02rem;line-height:1.25}.lrow small{color:var(--muted);font-weight:500}
.lrow .st{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--ok-50);color:var(--ok)}
.lrow .st.now{background:var(--ink);color:var(--bg)}.lrow .st.todo{background:var(--surface-2);color:var(--muted)}
.lrow.cur{box-shadow:0 0 0 2px var(--ink)}

/* ---------- lesson ---------- */
.ltop .t{min-width:0}.ltop .t small{display:block;color:var(--muted);font-weight:700;font-size:.7rem;text-transform:uppercase;letter-spacing:.07em}
.ltop .t b{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:1rem;font-weight:600}
.lprog{height:3px;background:transparent}.lprog i{display:block;height:100%;width:0;background:var(--ink);transition:width .15s}
.lhero{padding:20px 0 8px}
.lhero .pill{background:var(--brand-50);color:var(--brand)}
.lhero h1{font-size:clamp(2.1rem,9vw,2.8rem);margin:12px 0 10px}
.lhero p{color:var(--muted);font-size:1.05rem}
.rule{margin-top:14px;overflow:hidden;scroll-margin-top:130px}
.rule>header{display:flex;gap:14px;align-items:center;padding:18px 18px 6px}
.rule .n{font-family:var(--serif);font-size:2rem;line-height:1;color:var(--brand);width:auto;min-width:22px;display:block;background:none;font-weight:500}
.rule .n .ico{width:24px;height:24px}
.rule h2{font-size:1.3rem}
.media{margin:8px 12px 0;border-radius:22px;overflow:hidden;background:var(--surface-2)}
.slides{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}
.slides::-webkit-scrollbar{display:none}
.slide{flex:0 0 100%;scroll-snap-align:center;margin:0}
.slide img{width:100%;aspect-ratio:16/10;object-fit:contain;background:#fff}
.cap{margin:0;padding:10px 16px 6px;color:var(--muted);font-size:.92rem;line-height:1.45;min-height:3.4em}
.dots{display:flex;justify-content:center;gap:6px;padding:4px 0 12px}
.dots i{width:7px;height:7px;border-radius:50%;background:var(--line)}.dots i.on{background:var(--ink);width:18px;border-radius:6px}
.body{padding:12px 18px 18px;font-size:1.04rem;line-height:1.7}
.body b{font-weight:700}
.example{margin:14px 0 0;padding:14px 16px;border-radius:22px;background:var(--t-peach);font-size:1rem;line-height:1.6}
.example>b:first-child{display:block;color:var(--warn);font-size:.72rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:2px}
.law{margin:0 12px 12px;border-radius:20px;background:var(--surface-2)}
.law summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:8px;padding:13px 14px;font-weight:600;font-size:.9rem;color:var(--muted)}
.law summary::-webkit-details-marker{display:none}
.law summary .sym{width:26px;height:26px;border-radius:50%;background:var(--surface);color:var(--brand);display:grid;place-items:center;font-weight:700}
.law[open] summary{color:var(--ink)}
.law summary>span:nth-child(2){flex:1}.law[open] summary .ico:last-child{transform:rotate(90deg)}.law .q{padding:0 14px 14px;font-size:.92rem;color:var(--muted)}
.law .q a{color:var(--brand);font-weight:700}
.signs{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:14px}
.signs div{text-align:center;font-size:.8rem;color:var(--muted);line-height:1.3}
.signs img{width:74px;height:74px;object-fit:contain;margin:0 auto 6px}
.next{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:20px}
.next a{padding:16px;text-decoration:none;display:grid;gap:2px}.next small{color:var(--muted);font-weight:700;font-size:.72rem;text-transform:uppercase;letter-spacing:.07em}
.next a:last-child{text-align:right}
.cta{position:fixed;left:0;right:0;z-index:25;bottom:calc(var(--tab-h) + 22px + env(safe-area-inset-bottom));padding:0 var(--pad);pointer-events:none}
.cta .wrap{display:flex;gap:10px}.cta .btn{flex:1;pointer-events:auto;justify-content:space-between;min-height:60px;padding:0 10px 0 26px;box-shadow:0 10px 28px rgba(22,24,29,.25)}
.cta .btn::after{content:"";width:44px;height:44px;border-radius:50%;background:var(--bg);flex:none;-webkit-mask:none;
  background:var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2316181d' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h14M13 6l6 6-6 6'/%3E%3C/svg%3E") center/22px no-repeat}
:root[data-theme=dark] .cta .btn::after{background:var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f2f1ed' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h14M13 6l6 6-6 6'/%3E%3C/svg%3E") center/22px no-repeat}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .cta .btn::after{background:var(--bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23f2f1ed' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h14M13 6l6 6-6 6'/%3E%3C/svg%3E") center/22px no-repeat}}
@media(min-width:960px){.cta{bottom:24px;left:var(--rail)}}

/* ---------- quiz ---------- */
.qtop .wrap{display:grid;grid-template-columns:44px 1fr auto;gap:12px;align-items:center;height:62px}
.qtop .iconbtn{background:var(--surface)}
.qtop .bar{height:6px}
.streak{display:flex;align-items:center;gap:4px;font-weight:700;color:#e8590c;background:var(--surface);border-radius:999px;padding:8px 12px}
.qmeta{display:flex;gap:8px;align-items:center;margin:14px 0 10px;flex-wrap:wrap}
.crit{display:flex;gap:10px;align-items:flex-start;padding:12px 16px;border-radius:20px;background:var(--bad-50);color:var(--bad);font-weight:600;font-size:.92rem;margin-bottom:12px}
.qimg{overflow:hidden;background:#fff}
.qimg img{width:100%;aspect-ratio:16/10;object-fit:contain}
.stem{font-size:clamp(1.45rem,6vw,1.8rem);line-height:1.2;margin:18px 4px 16px}
.opts{display:grid;gap:10px}
.opt{display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:center;text-align:left;min-height:60px;padding:12px 16px;border-radius:22px;border:2px solid transparent;background:var(--surface);font-size:1.02rem;font-weight:500;line-height:1.35;transition:border-color .12s,background .12s,transform .08s}
.opt:active{transform:scale(.99)}
.opt .k{width:30px;height:30px;border-radius:50%;background:var(--bg);color:var(--muted);display:grid;place-items:center;font-weight:700;font-size:.85rem}
.opt:hover{border-color:var(--line)}
.opt.correct{border-color:var(--ok);background:var(--ok-50)}.opt.correct .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-50)}.opt.wrong .k{background:var(--bad);color:#fff}
.opt.dim{opacity:.55}
.opts.done .opt{pointer-events:none}
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:40;transform:translateY(110%);transition:transform .25s cubic-bezier(.2,.8,.2,1);background:var(--surface);border-radius:30px 30px 0 0;box-shadow:0 -12px 40px rgba(22,24,29,.14);padding:20px 0 calc(20px + env(safe-area-inset-bottom))}
.sheet.show{transform:none}
.sheet .wrap{display:grid;gap:12px}
.sheet .h{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:1.45rem}
.sheet .h .badge{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--ok-50);color:var(--ok)}
.sheet.bad .h .badge{background:var(--bad-50);color:var(--bad)}.sheet.bad .h{color:var(--bad)}.sheet.ok .h{color:var(--ok)}
.sheet p{margin:0;color:var(--muted);font-size:.98rem}
.done-card{text-align:center;padding:28px 18px;display:none}
.done-card h2{font-size:1.9rem;margin:10px 0 6px}.done-card.show{display:block}

/* ---------- result ---------- */
.rhero{margin-top:14px;padding:24px 18px;text-align:center;border-radius:var(--r-l);background:var(--t-mint);position:relative;overflow:hidden}
.rhero.fail{background:var(--bad-50)}
.bigring{position:relative;width:176px;height:176px;margin:8px auto 10px}
.bigring svg{width:100%;height:100%;transform:rotate(-90deg)}
.bigring .t{position:absolute;inset:0;display:grid;place-content:center}
.bigring b{font-family:var(--serif);font-weight:500;font-size:3.6rem;line-height:1}.bigring small{color:var(--muted);font-weight:700}
.verdict{display:inline-flex;align-items:center;gap:8px;padding:9px 18px;border-radius:999px;font-weight:700;background:var(--surface);color:var(--ok);font-size:1.05rem}
.rhero.fail .verdict{color:var(--bad)}
.rhero p{margin:12px 0 0;color:var(--muted)}
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}
.facts div{padding:14px 8px;text-align:center}.facts b{display:block;font-family:var(--serif);font-weight:500;font-size:1.6rem}.facts small{color:var(--muted);font-weight:700;font-size:.72rem;text-transform:uppercase;letter-spacing:.05em}
.loss{display:flex;height:14px;border-radius:99px;overflow:hidden;background:var(--ok);margin:12px 0 8px}
.loss i{display:block;height:100%}.loss .w{background:#e0a100}.loss .c{background:var(--bad)}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:.84rem;color:var(--muted);font-weight:600}
.legend i{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:6px}
.topic{display:grid;grid-template-columns:1fr auto;gap:6px 12px;align-items:center;padding:12px 0;border-top:1px solid var(--line)}
.topic:first-child{border-top:0}.topic b{font-size:.98rem;font-weight:600}.topic .bar{grid-column:1/-1;height:8px}
.topic .bar>i{background:var(--brand)}
.topic.weak .bar>i{background:var(--bad)}.topic.good .bar>i{background:var(--ok)}
.mist{margin-top:10px;overflow:hidden}
.mist summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:16px}
.mist summary::-webkit-details-marker{display:none}
.mist .no{width:30px;height:30px;border-radius:50%;background:var(--bad-50);color:var(--bad);display:grid;place-items:center;font-weight:700;font-size:.85rem}
.mist summary b{font-size:.98rem;line-height:1.3;font-weight:600}
.mist[open] summary .ico:last-child{transform:rotate(90deg)}
.mist .in{padding:0 16px 16px;display:grid;gap:10px}
.mist .in img{border-radius:20px;background:#fff;aspect-ratio:16/10;object-fit:contain;width:100%}
.ans{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:18px;font-size:.96rem;font-weight:500}
.ans.y{background:var(--bad-50);color:var(--bad)}.ans.g{background:var(--ok-50);color:var(--ok)}
.ans small{display:block;font-weight:700;text-transform:uppercase;letter-spacing:.06em;font-size:.68rem;opacity:.85}
.why{color:var(--muted);font-size:.95rem}
.actions{display:grid;gap:10px;margin-top:20px}
.hist{display:flex;align-items:flex-end;gap:10px;height:96px;padding:6px 4px 0}
.hist div{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:center;gap:6px;height:100%}
.hist i{display:block;width:100%;border-radius:10px;background:var(--line)}.hist .ok i{background:var(--ink)}.hist .bad i{background:var(--line)}
.hist span{font-size:.72rem;color:var(--muted);font-weight:700}
.note{margin:26px 0 8px;text-align:center;font-size:.8rem;color:var(--muted)}
@media(min-width:720px){.qa{grid-template-columns:repeat(4,1fr)}.cont{grid-template-columns:1fr 140px}.cont .thumb{width:140px;height:140px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

/* ======================= additions for the real site ======================= */
.skip{position:absolute;left:-999px;top:8px;z-index:100;background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:999px;text-decoration:none;font-weight:700}
.skip:focus{left:12px}
#main:focus{outline:none}
.lead{color:var(--muted);font-size:1.05rem;margin:10px 0 0;max-width:46ch}
.small{font-size:.9rem}
.foot{margin-top:40px;padding:22px 0 8px;border-top:1px solid var(--line);color:var(--muted);font-size:.84rem}
.foot p{margin:0 0 6px}.foot a{color:var(--muted);text-decoration:underline}
.parth{font-size:1.35rem;margin:28px 0 2px}
.partd{color:var(--muted);font-size:.92rem;margin:0 0 10px}
.part .lrow+.lrow{margin-top:10px}
.lrow.done .st{background:var(--ok-50);color:var(--ok)}
.lrow.todo .st{background:var(--surface-2);color:var(--muted)}
.lrow.todo.now .st{background:var(--ink);color:var(--bg)}
.lrow .st.todo{background:var(--surface-2);color:var(--muted)}
.lrow.done .st .ico{stroke-width:3}
.cta .btn{flex-direction:row}
.cta .btn span{display:block;line-height:1.2;text-align:left}
.cta .btn small{display:block;font-weight:500;opacity:.7;font-size:.78rem}
.donebox{margin-top:18px}
.donebox .btn.is-done{background:var(--ok-50);color:var(--ok)}
.rule .n.sn{display:grid;place-items:center;width:30px;height:30px;color:var(--ok)}
.signs.inl{padding:0 18px 14px;grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}
.signs b{display:block;color:var(--ink);font-weight:600}
.rules3{margin:18px 0 0;padding:16px 18px 16px 36px;background:var(--surface);border-radius:var(--r-l);color:var(--muted)}
.rules3 li{margin:6px 0}
.prose p{max-width:62ch}
/* practice */
.modes{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 4px}
.modes .chip{cursor:pointer;border:0;font-family:inherit}
.modes .chip[aria-pressed=true]{background:var(--ink);color:var(--bg)}
.lockcard{margin-top:18px;padding:22px 20px;text-align:center}
.lockcard h2{font-size:1.5rem;margin:8px 0}
.lockcard p{color:var(--muted);margin:0 0 14px}
.lockcard .ico{width:30px;height:30px;color:var(--brand)}
.pickl{width:100%;margin:10px 0 0;padding:14px 16px;border-radius:999px;border:0;background:var(--surface);color:var(--ink);font:inherit;font-weight:600}
.qwrap{padding-top:4px}
.qtop .bar>i{transition:width .25s}
/* pricing */
.plans{display:grid;gap:12px;margin-top:18px}
@media(min-width:720px){.plans{grid-template-columns:repeat(2,1fr)}}@media(min-width:1000px){.plans{grid-template-columns:repeat(4,1fr)}}
.plan{padding:22px 20px;position:relative;display:flex;flex-direction:column;gap:12px}
.plan.pop{box-shadow:0 0 0 2px var(--ink)}
.popb{position:absolute;top:-12px;left:20px}
.plan h2{font-size:1.5rem}
.price{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.price .amt{font-family:var(--serif);font-weight:500;font-size:2.4rem;line-height:1}
.price small{color:var(--muted)}
.inc{list-style:none;margin:0;padding:0;display:grid;gap:8px;flex:1;font-size:.95rem}
.inc li{display:flex;gap:10px;align-items:flex-start}
.inc .ico{color:var(--ok);margin-top:3px;stroke-width:3}
/* forms and messages */
.form{display:grid;gap:12px;margin-top:14px}
.form label{font-weight:600;font-size:.9rem}
.form input{width:100%;min-height:54px;padding:0 18px;border-radius:999px;border:2px solid var(--line);background:var(--bg);color:var(--ink);font:inherit}
.form input:focus{outline:none;border-color:var(--brand)}
.msg{margin:12px 0 0;padding:12px 16px;border-radius:20px;background:var(--ok-50);color:var(--ok);font-weight:500;font-size:.95rem;word-break:break-word}
.msg.bad{background:var(--bad-50);color:var(--bad)}
.msg a{color:inherit;font-weight:700}
.acctcard{padding:20px;margin-top:12px;display:grid;gap:10px}
.acctcard .row{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}
.acctcard b{font-weight:600}
/* exam */
.mkbar{position:sticky;top:58px;z-index:15;display:flex;align-items:center;gap:10px;justify-content:space-between;padding:10px 0;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(10px)}
.mkbar b{font-weight:600}
.mkt{font-variant-numeric:tabular-nums;font-weight:700;background:var(--surface);border-radius:999px;padding:7px 14px}
.mkt.low{background:var(--bad-50);color:var(--bad)}
.mknav{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.mknav .btn{flex:1;min-width:120px;min-height:50px}
.mknav .btn[disabled]{opacity:.4;pointer-events:none}
.grid50{display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin-top:16px}
.grid50 button{aspect-ratio:1;border:0;border-radius:10px;background:var(--surface);font-size:.78rem;font-weight:600;position:relative}
.grid50 button.ans{background:var(--ink);color:var(--bg)}
.grid50 button.cur{box-shadow:0 0 0 2px var(--brand)}
.grid50 button.fl::after{content:"";position:absolute;top:3px;right:3px;width:7px;height:7px;border-radius:50%;background:#e8590c}
.opt.sel{border-color:var(--ink);background:var(--surface-2)}
.opt.sel .k{background:var(--ink);color:var(--bg)}
.histtbl{width:100%;border-collapse:collapse;font-size:.92rem;margin-top:8px}
.histtbl th,.histtbl td{padding:9px 6px;text-align:left;border-top:1px solid var(--line)}
.histtbl th{color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;border-top:0}
.ok-t{color:var(--ok)}.bad-t{color:var(--bad)}
.ready .ring .rp{transition:stroke-dashoffset .6s}
.hist .ok i,.hist .bad i{min-height:6px}
.noscript-note{padding:20px}
.plan .btn.ghost{background:var(--bg)}

/* lesson: test yourself tiers, practice setup */
.tests{margin-top:22px}.tests h2{font-size:1.5rem;margin-bottom:4px}
.tiers{display:grid;gap:10px;margin-top:12px}
@media(min-width:720px){.tiers{grid-template-columns:repeat(3,1fr)}}
.tier{display:grid;gap:6px;padding:16px 18px;text-decoration:none;align-content:start}
.tier b{font-family:var(--serif);font-weight:500;font-size:1.3rem}
.tier span{color:var(--muted);font-size:.92rem;line-height:1.4}
.tier small.tc{font-weight:700;font-size:.8rem}
.tier em{font-style:normal;color:var(--muted);font-size:.8rem}
.tier .bar{height:6px;margin-top:4px}
.tier-easy{box-shadow:inset 4px 0 0 var(--ok)}.tier-medium{box-shadow:inset 4px 0 0 var(--brand)}.tier-hard{box-shadow:inset 4px 0 0 var(--bad)}
.setup{margin-top:14px;display:grid;gap:8px}
.setup label,.setup .lab{font-size:.74rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin-top:6px}
.setup .pickl{margin:0;background:var(--bg)}
.selinfo{margin:10px 0 4px;display:grid;gap:6px}
.linkbtn{background:none;border:0;padding:0;color:var(--muted);text-decoration:underline;font:inherit;font-size:.85rem}
.setup .btn[disabled]{opacity:.4;pointer-events:none}
.setup .chip{background:var(--bg)}.setup .chip[aria-pressed=true]{background:var(--ink);color:var(--bg)}

/* locked lessons */
.paywalled{margin-top:14px}
.outlineh{font-family:var(--font);font-size:.74rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin:22px 4px 8px}
.outline{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.outline li{display:flex;align-items:center;gap:10px;padding:13px 16px;border-radius:20px;background:var(--surface);color:var(--muted);font-weight:500}
.outline .lk{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--surface-2)}
.lrow.locked .st{background:var(--surface-2);color:var(--muted)}

.aslide{padding:0}.aslide .anim-svg{border-radius:0}.aslide .anim-bar,.aslide .anim-cap,.aslide .anim-steps{padding:0 14px}.aslide .anim-steps{padding-bottom:10px}

.snav{display:flex;justify-content:center;align-items:center;gap:14px;padding:6px 0 12px}.snav button{width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:var(--surface);color:var(--ink);display:grid;place-items:center;cursor:pointer;padding:0}.snav button:hover:not(:disabled){background:var(--surface-2)}.snav button:disabled{opacity:.3;cursor:default}.scount{font-variant-numeric:tabular-nums;font-size:.92rem;color:var(--muted);min-width:3.4em;text-align:center}