/* ============================================================
   EXCEL ACADÉMIE — calm pastel study theme (v3: study dashboard)
   Palette, type and radii live in :root. Track colours:
   skills = sky (blue), visual = rose (pink), finance = mint (green).
   ============================================================ */
:root {
  --bg: #FBFAFD; --ink: #1E1B2E; --ink-2: #4A4660; --muted: #7A7692;
  --line: #E9E6F1; --line-strong: #CFCADD; --paper: #FFFFFF; --grid: #EFEBF7;

  --sky: #BFE0FB;    --sky-d: #2F6FA8;    --sky-l: #EAF4FD;
  --rose: #FAC3DC;   --rose-d: #B83D7C;   --rose-l: #FDEEF5;
  --mint: #C5EBD2;   --mint-d: #23704B;   --mint-l: #E9F7EE;
  --butter: #FBEAA8; --butter-d: #8A6A0A; --butter-l: #FEF8DF;
  --lilac: #DCCBFA;  --lilac-d: #6B46C1;  --lilac-l: #F2ECFE;
  --peach: #FDD5B8;  --peach-d: #B0541A;  --peach-l: #FEF0E4;
  --ok: #23704B; --bad: #B8344F; --bad-l: #FDEDF0;

  --r-xl: 32px; --r-lg: 24px; --r-md: 16px; --r-sm: 10px;
  --side: 268px; --gutter: clamp(16px, 2.6vw, 44px);
  --font-display: 'Bricolage Grotesque', 'Segoe UI', system-ui, sans-serif;
  --font: 'Figtree', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'Cascadia Code', Consolas, monospace;
  --ease: cubic-bezier(.2, .7, .1, 1);
}
.c-blue, .c-sky { --c: var(--sky); --cd: var(--sky-d); --cl: var(--sky-l); }
.c-pink, .c-rose { --c: var(--rose); --cd: var(--rose-d); --cl: var(--rose-l); }
.c-green, .c-mint { --c: var(--mint); --cd: var(--mint-d); --cl: var(--mint-l); }
.c-yellow { --c: var(--butter); --cd: var(--butter-d); --cl: var(--butter-l); }
.c-lilac { --c: var(--lilac); --cd: var(--lilac-d); --cl: var(--lilac-l); }
.c-peach { --c: var(--peach); --cd: var(--peach-d); --cl: var(--peach-l); }
body { --c: var(--lilac); --cd: var(--lilac-d); --cl: var(--lilac-l); }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; min-height: 100dvh; background: var(--bg); color: var(--ink); font: 400 1rem/1.6 var(--font); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2, h3 { margin: 0; font-family: var(--font-display); font-weight: 500; letter-spacing: -.02em; line-height: 1.12; text-wrap: balance; }
h2 { font-size: 1.15rem; }
p { margin: 0 0 .8em; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; border-radius: 8px; }
.ic { flex: none; display: inline-block; vertical-align: middle; }
.muted { color: var(--muted); } .small { font-size: .88rem; } .grow { flex: 1; min-width: 0; }
code { font-family: var(--font-mono); font-size: .86em; background: #F1EEF8; color: var(--ink); padding: .12em .45em; border-radius: 7px; white-space: normal; overflow-wrap: anywhere; }
kbd { font-family: var(--font-mono); font-size: .78em; background: #fff; border: 1px solid var(--line-strong); border-bottom-width: 2px; border-radius: 7px; padding: 1px 7px; white-space: nowrap; }
.sw { display: inline-block; width: .9em; height: .9em; border-radius: 4px; vertical-align: -.1em; margin-right: .15em; border: 1px solid rgba(30, 27, 46, .15); }
.empty { display: grid; place-items: center; text-align: center; gap: 2px; padding: 36px 16px; color: var(--muted); }
.empty p { margin: 0; }

/* soft pastel light behind everything */
.atmo { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.blob { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .55; will-change: transform; animation: drift 36s ease-in-out infinite alternate; }
.b1 { width: 44vw; height: 44vw; top: -16vw; right: -10vw; background: radial-gradient(circle at 35% 35%, var(--sky), transparent 68%); }
.b2 { width: 40vw; height: 40vw; bottom: -14vw; left: 10vw; background: radial-gradient(circle at 60% 40%, var(--rose), transparent 68%); animation-duration: 42s; animation-delay: -9s; }
.b3 { width: 26vw; height: 26vw; top: 40vh; left: 50vw; background: radial-gradient(circle, var(--butter), transparent 70%); opacity: .4; animation-duration: 48s; animation-delay: -18s; }
@keyframes drift { from { transform: translate3d(0, 0, 0) scale(1); } to { transform: translate3d(4vw, 3vh, 0) scale(1.1); } }

/* ---------- buttons, chips ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 46px; padding: 0 22px; border-radius: 999px; border: 1px solid transparent; font-weight: 600; font-size: .98rem; transition: transform .2s var(--ease), background .2s, box-shadow .2s; }
.btn.primary { background: var(--ink); color: #fff; box-shadow: 0 10px 24px -10px rgba(30, 27, 46, .6); }
.btn.primary:hover { transform: translateY(-2px); box-shadow: 0 16px 28px -12px rgba(30, 27, 46, .65); }
.btn.soft { background: rgba(255, 255, 255, .75); border-color: var(--line-strong); }
.btn.soft:hover { background: #fff; transform: translateY(-1px); }
.btn.text { background: transparent; padding: 0 12px; min-height: 38px; color: var(--ink-2); }
.btn.text:hover { color: var(--ink); background: rgba(30, 27, 46, .05); }
.btn.sm { min-height: 38px; padding: 0 16px; font-size: .9rem; }
.btn.big { min-height: 56px; padding: 0 34px; font-size: 1.08rem; }
.btn[disabled] { opacity: .45; cursor: not-allowed; transform: none; }
.back { display: inline-flex; align-items: center; gap: 4px; color: var(--ink-2); font-weight: 500; font-size: .92rem; background: none; border: 0; padding: 0; }
.back:hover { color: var(--ink); }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 3px 12px; border-radius: 999px; background: var(--cl); border: 1px solid var(--c); font-size: .82rem; font-weight: 500; color: var(--ink); }
button.chip { cursor: pointer; background: #fff; border-color: var(--line-strong); }
button.chip:hover { border-color: var(--ink); }
button.chip.active { background: var(--ink); color: #fff; border-color: var(--ink); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 18px; }
.actions.center { justify-content: center; }
.thin { display: block; height: 5px; border-radius: 99px; background: var(--line); overflow: hidden; margin: 6px 0 5px; min-width: 90px; }
.thin > i { display: block; height: 100%; background: var(--cd); border-radius: 99px; transition: width .8s var(--ease); }

/* ====================== SHELL ====================== */
.shell { display: grid; grid-template-columns: var(--side) minmax(0, 1fr); min-height: 100dvh; }
.side { position: sticky; top: 0; height: 100dvh; display: flex; flex-direction: column; gap: 14px; padding: 20px 16px 16px; background: rgba(255, 255, 255, .6); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-right: 1px solid var(--line); overflow-y: auto; }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 10px 8px; font: 600 1.05rem var(--font-display); letter-spacing: -.01em; }
.nav { display: flex; flex-direction: column; gap: 14px; flex: 1; }
.nav-group { display: flex; flex-direction: column; gap: 2px; }
.nav-label { padding: 6px 12px 4px; font-size: .78rem; font-weight: 600; color: var(--muted); }
.nav-item { display: flex; align-items: center; gap: 11px; padding: 9px 12px; border-radius: 14px; font-weight: 500; font-size: .95rem; color: var(--ink-2); transition: background .18s, color .18s; }
.nav-item:hover { background: rgba(30, 27, 46, .05); color: var(--ink); }
.nav-item.on { background: var(--ink); color: #fff; }
.nav-item.in { background: var(--cl); color: var(--ink); }
.nav-item .lab { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.nav-item .letter { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 8px; background: var(--c); color: var(--ink); font: 600 .8rem var(--font-display); }
.nav-count { font-size: .78rem; opacity: .65; font-variant-numeric: tabular-nums; }
.nav-item kbd { background: transparent; border-color: var(--line-strong); color: var(--muted); }
.nav-item.on kbd { border-color: rgba(255, 255, 255, .35); color: rgba(255, 255, 255, .7); }
.subnav { display: flex; flex-direction: column; gap: 1px; margin: 2px 0 6px 22px; padding-left: 14px; border-left: 2px solid var(--c); }
.sub { display: flex; justify-content: space-between; gap: 8px; padding: 6px 10px; border-radius: 10px; font-size: .88rem; color: var(--ink-2); }
.sub:hover { background: rgba(30, 27, 46, .05); }
.sub.on { background: var(--cl); color: var(--ink); font-weight: 600; }
.sub em { font-style: normal; font-size: .72rem; color: var(--muted); }
.side-foot { display: flex; flex-direction: column; gap: 10px; padding-top: 12px; border-top: 1px solid var(--line); }
.mini-level { display: flex; align-items: center; gap: 10px; padding: 4px 6px; border-radius: 14px; }
.mini-level:hover { background: rgba(30, 27, 46, .05); }
.mini-level > span { flex: 1; min-width: 0; font-size: .9rem; }
.mini-level .thin { margin: 5px 0 0; }
.lang { background: none; border: 1px solid var(--line-strong); border-radius: 999px; padding: 6px 14px; font-size: .85rem; color: var(--muted); align-self: flex-start; }
.lang b { color: var(--ink); font-weight: 600; }
.lang:hover { background: #fff; }

.main { min-width: 0; display: flex; flex-direction: column; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px var(--gutter) 6px; min-height: 56px; }
.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 7px; font-size: .9rem; color: var(--ink-2); min-width: 0; }
.crumbs a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.crumbs .sl { color: var(--line-strong); }
.crumbs .here { color: var(--ink); font-weight: 600; }
.top-actions { display: flex; align-items: center; gap: 10px; flex: none; }
.search-btn { display: inline-flex; align-items: center; gap: 9px; padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line-strong); background: rgba(255, 255, 255, .8); color: var(--muted); font-size: .9rem; }
.search-btn:hover { background: #fff; color: var(--ink); }
.search-btn kbd { background: transparent; }
.stat { display: inline-flex; align-items: center; gap: 5px; font-size: .92rem; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.stat .ic { color: var(--rose-d); }
.icon-btn { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line-strong); background: rgba(255, 255, 255, .8); color: var(--ink-2); padding: 0; transition: background .2s, color .2s; }
.icon-btn:hover { background: #fff; color: var(--ink); }
.icon-btn.muted { color: var(--muted); background: transparent; border-style: dashed; }
.lang-top { display: none; }
main#app { padding: 4px var(--gutter) 24px; min-width: 0; }
main#app.enter { animation: enter .3s var(--ease); }
@keyframes enter { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
body.is-welcome .side { display: none; }
body.is-welcome .shell { grid-template-columns: minmax(0, 1fr); }

/* ====================== PAGE HEADERS ====================== */
.page-head { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; margin: 2px 0 16px; }
.page-title { font-weight: 400; font-size: clamp(1.8rem, 3.4vw, 2.7rem); letter-spacing: -.035em; }
.page-head p { margin: 4px 0 0; max-width: 56ch; }
.letter { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 13px; background: var(--c); font: 600 1.15rem var(--font-display); }
.letter.big { width: 58px; height: 58px; border-radius: 18px; font-size: 1.6rem; }
.head-stat { font: 400 2.2rem/1 var(--font-display); letter-spacing: -.04em; display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.head-stat small, .head-stat .muted { font: 400 .85rem var(--font); letter-spacing: 0; }
.soon-tag { padding: 3px 11px; border-radius: 999px; border: 1px dashed var(--line-strong); font-size: .8rem; color: var(--muted); }

/* ====================== CARDS & DASHBOARD ====================== */
.card { background: rgba(255, 255, 255, .86); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 16px 20px; box-shadow: 0 1px 0 rgba(255, 255, 255, .8) inset; }
.card h2 { font-size: 1.05rem; margin-bottom: 8px; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.card-head h2 { margin: 0; }
.dash { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: 16px; }
.hero-card { grid-column: span 8; display: flex; justify-content: space-between; gap: 24px; align-items: stretch; background: linear-gradient(135deg, var(--cl), rgba(255, 255, 255, .9) 70%); border-color: var(--c); padding: 18px 26px; }
.hero-text { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; min-width: 0; }
.dash-title { font-weight: 400; font-size: clamp(1.5rem, 2.5vw, 2.15rem); letter-spacing: -.035em; line-height: 1.05; }
.hero-text p { margin: 0; }
.hero-text .actions { margin-top: 6px; }
.hero-side { display: flex; flex-direction: column; justify-content: flex-end; align-items: flex-end; gap: 6px; flex: none; }
.level-card { grid-column: span 4; display: grid; grid-template-columns: auto 1fr; gap: 10px 16px; align-items: center; }
.level-main b { font: 500 1.3rem var(--font-display); letter-spacing: -.02em; }
.level-stats { grid-column: 1 / -1; display: flex; gap: 16px; flex-wrap: wrap; padding-top: 10px; border-top: 1px solid var(--line); font-size: .9rem; color: var(--ink-2); }
.level-stats span { display: inline-flex; align-items: center; gap: 6px; }
.level-stats .ic { color: var(--cd); }
.next-card { grid-column: span 5; } .path-card { grid-column: span 7; }
.review-card { grid-column: span 5; } .badges-card { grid-column: span 7; }
.mini-list { display: flex; flex-direction: column; gap: 4px; }
.mini-row { display: flex; align-items: center; gap: 12px; padding: 6px 10px; margin: 0 -10px; border-radius: 14px; transition: background .18s; }
.mini-row:hover { background: var(--cl, rgba(30, 27, 46, .05)); }
.mini-ic { flex: none; display: grid; place-items: center; width: 30px; height: 30px; border-radius: 10px; background: var(--c); color: var(--ink); }
.mini-t { flex: 1; min-width: 0; }
.mini-t b { display: block; font-weight: 600; font-size: .95rem; line-height: 1.25; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mini-t small { color: var(--muted); font-size: .8rem; }
.warn-dot { color: var(--butter-d); }
.path-list { display: flex; flex-direction: column; gap: 6px; }
.path-row { display: flex; align-items: center; gap: 14px; padding: 6px 0; }
.path-row .letter { width: 32px; height: 32px; flex: none; border-radius: 11px; font-size: 1rem; }
.path-main { flex: 1; min-width: 0; font-size: .95rem; }
.path-main .thin { margin: 5px 0 0; height: 7px; }
.path-n { font-size: .85rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.path-n b { color: var(--ink); }
.path-row:hover .path-main b { text-decoration: underline; text-underline-offset: 3px; }
.badge-strip { display: flex; flex-wrap: wrap; gap: 10px; }
.badge-dot { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--c); color: var(--ink); }
.badge-dot.locked { background: var(--line); color: var(--muted); opacity: .6; }

/* chapters of a track */
.ccards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr)); gap: 16px; }
.ccard { position: relative; display: flex; flex-direction: column; gap: 4px; padding: 20px 22px; border-radius: var(--r-lg); background: rgba(255, 255, 255, .86); border: 1px solid var(--line); transition: transform .25s var(--ease), border-color .2s, background .2s; }
.ccard:hover { transform: translateY(-3px); border-color: var(--c); background: var(--cl); }
.ccard-top { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.ccard h3 { font: 500 1.3rem var(--font-display); letter-spacing: -.02em; }
.ccard p { margin: 0; color: var(--ink-2); font-size: .94rem; }
.count { font-size: .88rem; color: var(--muted); font-variant-numeric: tabular-nums; } .count b { color: var(--ink); }
.cells { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.cell { width: 13px; height: 13px; border-radius: 4px; border: 1.5px solid var(--line-strong); transition: background .3s, border-color .3s; }
.cell.on { background: var(--c); border-color: var(--cd); }
.cell.known { background: repeating-linear-gradient(45deg, var(--c), var(--c) 2px, transparent 2px, transparent 4px); border-color: var(--cd); }
.cell.dashed { border-style: dashed; }
.warn-line { display: inline-flex; align-items: center; gap: 6px; margin-top: 8px; font-size: .84rem; color: var(--butter-d); }

/* chapter page */
.level-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr)); gap: 22px 28px; align-items: start; }
.level h2 { font-size: 1.2rem; font-weight: 500; display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; padding-bottom: 10px; border-bottom: 1px solid var(--ink); margin-bottom: 4px; }
.level h2 small { font: 500 .82rem var(--font); color: var(--muted); letter-spacing: 0; }
.row.lesson { position: relative; display: grid; grid-template-columns: 40px minmax(0, 1fr); column-gap: 12px; align-items: center; padding: 11px 6px; border-bottom: 1px solid var(--line); isolation: isolate; }
.row.lesson::before { content: ''; position: absolute; inset: 0 -10px; border-radius: 14px; background: var(--cl); transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease); z-index: -1; }
.row.lesson:hover::before { transform: scaleX(1); }
.row.lesson .num { grid-row: 1 / span 2; display: grid; place-items: center; width: 32px; height: 32px; border-radius: 10px; border: 1.5px solid var(--line-strong); font-weight: 600; font-size: .85rem; color: var(--ink-2); }
.row.lesson.done .num { background: var(--c); border-color: var(--cd); color: var(--ink); }
.row.lesson.next .num { background: var(--ink); border-color: var(--ink); color: #fff; }
.row-title { font: 500 1rem/1.25 var(--font-display); letter-spacing: -.01em; grid-column: 2; align-self: end; }
.row-sub { color: var(--muted); font-size: .82rem; grid-column: 2; }
.roadmap-block { margin-top: 26px; }
.roadmap { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 0 32px; }
.road { display: flex; gap: 12px; align-items: center; padding: 11px 4px; border-bottom: 1px dashed var(--line-strong); color: var(--ink-2); font-size: .94rem; }
.road::before { content: ''; flex: none; width: 13px; height: 13px; border-radius: 4px; border: 1.5px dashed var(--line-strong); }

/* prerequisites (soft warning) */
.prereq { background: var(--butter-l); border: 1px solid #F1E3A2; border-radius: var(--r-lg); padding: 8px 18px; margin: 0 0 12px; }
.prereq-top { display: flex; align-items: center; gap: 4px 14px; flex-wrap: wrap; }
.prereq-intro { flex: 1 1 260px; color: var(--ink-2); font-size: .9rem; }
.prereq h2 { font-size: 1rem; display: flex; align-items: center; gap: 8px; margin: 0; }
.prereq h2 .ic { color: var(--butter-d); }
.prereq > p { color: var(--ink-2); margin-bottom: 6px; font-size: .94rem; }
.preq-list { max-height: 92px; overflow-y: auto; margin-top: 4px; }
.preq-row { display: flex; align-items: center; gap: 4px 16px; flex-wrap: wrap; padding: 5px 0; border-top: 1px solid rgba(138, 106, 10, .2); }
.preq-row .t { flex: 1 1 200px; min-width: 0; }
.preq-row .t b { font-weight: 600; } .preq-row .t small { display: block; color: var(--muted); }
.preq-actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.prereq-foot { display: flex; justify-content: flex-end; padding-top: 6px; border-top: 1px solid rgba(138, 106, 10, .2); }
.prereq.min { display: flex; align-items: center; gap: 12px; padding: 8px 16px; border-radius: 999px; }
.prereq.min .ic { color: var(--butter-d); } .prereq.min span { flex: 1; font-size: .9rem; }

/* ====================== LESSONS (one screen at a time) ====================== */
.lesson { display: flex; flex-direction: column; }
.lhead { display: flex; align-items: center; gap: 8px 24px; flex-wrap: wrap; margin: 0 0 12px; }
body.is-lesson .top { min-height: 42px; padding-top: 8px; padding-bottom: 2px; }
.lhead-main { flex: 1 1 320px; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.ltitle { font-weight: 400; font-size: clamp(1.45rem, 2.3vw, 1.95rem); letter-spacing: -.035em; line-height: 1.05; }
.stages { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.stages li { display: inline-flex; align-items: center; gap: 7px; padding: 5px 13px 5px 6px; border-radius: 999px; background: rgba(255, 255, 255, .7); border: 1px solid var(--line); font-size: .85rem; color: var(--muted); }
.stages .dot { display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; background: var(--line); font-size: .72rem; font-weight: 600; color: var(--ink-2); }
.stages li.cur { background: var(--cl); border-color: var(--c); color: var(--ink); font-weight: 600; }
.stages li.cur .dot { background: var(--ink); color: #fff; }
.stages li.done .dot { background: var(--cd); color: #fff; }
.lbody { flex: 1; }
.lbody.swap { animation: enter .28s var(--ease); }
.two { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(20px, 3.4vw, 56px); align-items: center; min-height: min(520px, calc(100dvh - 210px)); }
.two.learn { grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); }
.stage .mission { margin-top: 12px; padding: 12px 16px; }
.read { min-width: 0; }
.stage { min-width: 0; }
.prose { line-height: 1.65; }
.prose p { margin: 0 0 .8em; }
.prose.big { font-size: 1.06rem; line-height: 1.62; max-width: 64ch; }
.mission { margin: 0 0 14px; padding: 16px 20px; border-radius: var(--r-md); background: var(--c); }
.mission b { display: block; font: 500 1rem var(--font-display); margin-bottom: 2px; }
.mission, .mission * { color: var(--ink); } .mission code { background: rgba(255, 255, 255, .6); }
.stage .mission { margin: 14px 0 0; }
.hints { display: grid; gap: 8px; margin-top: 12px; }
.hint { display: flex; gap: 12px; padding: 10px 14px; border-radius: var(--r-md); background: var(--sky-l); animation: enter .3s var(--ease); }
.hint .ic { color: var(--sky-d); margin-top: 3px; }
.note { display: flex; gap: 12px; padding: 14px 16px; border-radius: var(--r-md); background: var(--lilac-l); margin-top: 12px; animation: enter .35s var(--ease); }
.note .ic-wrap { flex: none; width: 34px; height: 34px; border-radius: 50%; background: #fff; display: grid; place-items: center; color: var(--lilac-d); }
.note.tip { background: var(--peach-l); } .note.tip .ic-wrap { color: var(--peach-d); }
.note b { font: 500 .98rem var(--font-display); display: block; margin-bottom: 2px; }
.note > div:last-child { min-width: 0; } .note p { margin: 0; }
.banner { display: flex; gap: 12px; align-items: flex-start; padding: 12px 16px; border-radius: var(--r-md); margin-top: 12px; animation: enter .3s var(--ease); }
.banner:first-child { margin-top: 0; }
.banner .ic-wrap { flex: none; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: #fff; }
.banner.good { background: var(--mint-l); } .banner.good .ic-wrap { color: var(--ok); }
.banner.bad { background: var(--bad-l); } .banner.bad .ic-wrap { color: var(--bad); }
.banner .xp { font-weight: 600; color: var(--ok); margin-left: 10px; }

/* the practice spreadsheet */
.win { background: var(--paper); border: 1px solid var(--line); border-radius: var(--r-lg); box-shadow: 0 30px 70px -40px rgba(30, 27, 46, .4); overflow: hidden; }
.fbar { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: #FCFBFE; }
.namebox { min-width: 60px; text-align: center; border: 1px solid var(--line); border-radius: 8px; padding: 3px 8px; font: 500 .85rem var(--font-mono); background: #fff; }
.fx { font: 500 .9rem var(--font-mono); color: var(--cd); }
.formula { flex: 1; min-width: 0; min-height: 30px; display: flex; align-items: center; padding: 0 12px; border: 1px solid var(--line); border-radius: 8px; background: #fff; font: 500 .92rem var(--font-mono); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.sheet-scroll { overflow-x: auto; }
table.sheet { border-collapse: collapse; width: 100%; font-size: 1rem; }
.sheet th { background: #F7F5FB; color: var(--muted); font-weight: 500; font-size: .78rem; text-align: center; border: 1px solid var(--line); height: 30px; }
.sheet th.col { min-width: 88px; } .sheet th.rh { width: 40px; }
.sheet td { border: 1px solid var(--line); height: 50px; padding: 0 14px; white-space: nowrap; }
.sheet td.head { background: var(--c); font-weight: 600; }
.sheet td.num { text-align: right; font-variant-numeric: tabular-nums; }
.win.compact .sheet td { height: 38px; padding: 0 12px; }
.win.compact .fbar { padding: 7px 12px; }
.win.compact .sheet th { height: 26px; }
.sheet td.target { position: relative; padding: 0; background: #fff; outline: 2px solid var(--cd); outline-offset: -2px; }
.sheet td.target.preview { text-align: center; font: 600 1.2rem var(--font-mono); color: var(--cd); background: var(--cl); }
.sheet td.target.solved { padding: 0 14px; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; background: var(--mint-l); }
.sheet td.target::after { content: ''; position: absolute; right: 0; bottom: 0; width: 8px; height: 8px; background: var(--cd); border: 1.5px solid #fff; z-index: 2; pointer-events: none; }
.sheet td.target input { width: 100%; height: 100%; min-height: 48px; border: 0; background: transparent; padding: 0 14px; font: 500 16px var(--font-mono); color: var(--ink); outline: none; }
.result { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 12px 14px; border-top: 1px solid var(--line); background: var(--cl); }
.result .live b { font: 500 .92rem var(--font-mono); background: #fff; padding: 3px 11px; border-radius: 8px; margin-left: 6px; }
.result .live.err b { color: var(--bad); }

/* quiz */
.center-card { max-width: 640px; margin: 8px auto 0; display: flex; flex-direction: column; align-items: center; text-align: center; gap: 8px; }
.center-card.wide { max-width: 760px; align-items: stretch; text-align: left; }
.center-card .prose.big { max-width: none; }
.big-n { font: 300 4rem/1 var(--font-display); letter-spacing: -.05em; margin: 6px 0 0; }
.qwrap { max-width: 720px; margin: 0 auto; }
.qseg, .seg { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 0 0 18px; }
.qseg span, .seg a { width: 36px; height: 7px; border-radius: 99px; background: var(--line-strong); transition: background .3s; }
.qseg span.on, .seg a.on { background: var(--cd); } .qseg span.cur, .seg a.cur { background: var(--ink); width: 52px; }
.seg { margin: 0; } .seg a { width: 26px; }
.qtitle { font-weight: 400; font-size: clamp(1.4rem, 2.4vw, 1.9rem); letter-spacing: -.03em; line-height: 1.2; margin-bottom: 18px; }
.opts { display: grid; gap: 8px; }
.opt { display: flex; gap: 14px; align-items: center; width: 100%; text-align: left; padding: 14px 18px; border: 1px solid var(--line-strong); border-radius: var(--r-md); background: rgba(255, 255, 255, .85); transition: border-color .2s, background .2s, transform .2s var(--ease); }
.opt .mark { flex: none; width: 22px; height: 22px; border-radius: 50%; border: 1.5px solid var(--line-strong); display: grid; place-items: center; color: #fff; }
.opt:hover:not([disabled]) { border-color: var(--ink); transform: translateX(4px); }
.opt.right { background: var(--mint-l); border-color: var(--ok); } .opt.right .mark { background: var(--ok); border-color: var(--ok); }
.opt.wrong { background: var(--bad-l); border-color: var(--bad); animation: shake .35s; } .opt.wrong .mark { background: var(--bad); border-color: var(--bad); }
.opt[disabled] { cursor: default; }
@keyframes shake { 25% { transform: translateX(-5px); } 75% { transform: translateX(5px); } }
#qfeed { margin-top: 4px; }

/* build projects: download, open, steps, check */
details { margin: .7em 0; padding: 10px 16px; border-radius: var(--r-md); background: var(--sky-l); }
details summary { cursor: pointer; font-weight: 600; } details p { margin: .5em 0 .2em; }
.panel { background: rgba(255, 255, 255, .86); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 20px 22px; }
.outline { margin: 8px 0 12px; padding-left: 22px; display: grid; gap: 6px; font-size: .96rem; } .outline li::marker { color: var(--cd); font-weight: 700; }
.file-ic { display: grid; place-items: center; width: 84px; height: 84px; border-radius: 26px; background: var(--c); color: var(--ink); margin-bottom: 4px; }
.center-card h2 { font-size: 1.7rem; font-weight: 400; letter-spacing: -.03em; }
#dlArea { width: 100%; margin: 8px 0 4px; }
.ask, .trouble { padding: 18px 20px; border-radius: var(--r-lg); background: var(--cl); text-align: center; animation: enter .3s var(--ease); }
.ask b, .trouble b { font: 500 1.15rem var(--font-display); }
.trouble ul { list-style: none; margin: 12px 0 4px; padding: 0; display: grid; gap: 8px; text-align: left; }
.trouble li { display: flex; gap: 10px; align-items: flex-start; font-size: .95rem; } .trouble li .ic { margin-top: 3px; color: var(--cd); }
.tabs { display: inline-flex; gap: 4px; padding: 4px; border-radius: 999px; background: rgba(255, 255, 255, .8); border: 1px solid var(--line); align-self: flex-start; }
.tab { display: inline-flex; align-items: center; gap: 7px; border: 0; background: transparent; padding: 7px 16px; border-radius: 999px; font-weight: 500; font-size: .92rem; color: var(--ink-2); }
.tab.on { background: var(--ink); color: #fff; }
.how { margin: 14px 0 6px; padding-left: 24px; display: grid; gap: 9px; font-size: 1.02rem; } .how li::marker { color: var(--cd); font-weight: 700; }
.steps-layout { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: clamp(18px, 3vw, 44px); align-items: start; }
.steps-nav { display: flex; flex-direction: column; gap: 2px; position: sticky; top: 14px; }
.sn { display: flex; align-items: flex-start; gap: 10px; text-align: left; padding: 8px 10px; border: 0; border-radius: 12px; background: transparent; font-size: .88rem; line-height: 1.3; color: var(--ink-2); }
.sn:hover { background: rgba(30, 27, 46, .05); }
.sn .dot { flex: none; display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--line); font-size: .72rem; font-weight: 600; margin-top: 1px; }
.sn.cur { background: var(--cl); color: var(--ink); font-weight: 600; } .sn.cur .dot { background: var(--ink); color: #fff; }
.sn.done .dot { background: var(--cd); color: #fff; }
.step-card { background: rgba(255, 255, 255, .88); border: 1px solid var(--line); border-radius: var(--r-lg); padding: clamp(18px, 2.4vw, 30px); min-height: 380px; display: flex; flex-direction: column; }
.step-count { font-size: .85rem; color: var(--muted); font-weight: 500; }
.step-h { font-weight: 400; font-size: clamp(1.4rem, 2.4vw, 1.9rem); letter-spacing: -.03em; margin: 2px 0 12px; }
.beat { animation: enter .35s var(--ease); padding-left: 14px; border-left: 3px solid transparent; margin-bottom: 4px; }
.beat.cur { border-left-color: var(--c); }
.beat-ctl { display: inline-flex; align-items: center; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
.beat-ctl .dots { gap: 5px; } .beat-ctl .dd { width: 18px; height: 6px; } .beat-ctl .dd.cur { width: 28px; }
.step-card .prose { font-size: 1.05rem; flex: 1; max-height: 52dvh; overflow-y: auto; padding-right: 6px; }
.step-actions { justify-content: space-between; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); }
.drop { display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center; padding: 30px 18px; margin-top: 14px; border-radius: var(--r-lg); border: 1.5px dashed var(--cd); background: var(--cl); cursor: pointer; transition: transform .25s var(--ease), background .2s; }
.drop:hover, .drop.over { transform: scale(1.012); background: #fff; }
.drop .ic { color: var(--cd); } .drop small { color: var(--muted); }
.privacy { display: flex; gap: 8px; align-items: flex-start; font-size: .84rem; color: var(--muted); margin: 12px 0 0; } .privacy .ic { margin-top: 2px; }
.report-panel { max-height: 62dvh; overflow-y: auto; }
.score b { font-weight: 600; }
.chk-group { font: 500 1rem var(--font-display); margin: 16px 0 6px; }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.chk { display: flex; gap: 12px; align-items: flex-start; padding: 9px 13px; border-radius: 14px; background: #fff; border: 1px solid var(--line); }
.chk .dot { flex: none; display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--line); color: #fff; margin-top: 1px; }
.chk.ok { background: var(--mint-l); border-color: #BFE6CC; } .chk.ok .dot { background: var(--ok); }
.chk.bad { background: var(--bad-l); border-color: #F1C2CC; } .chk.bad .dot { background: var(--bad); }
.chk.opt .dot { background: var(--line-strong); }
.chk b { font-weight: 600; } .chk-msg { font-size: .9rem; margin-top: 2px; color: var(--ink-2); }

/* welcome (first visit) */
.welcome { max-width: 920px; margin: 6vh auto 0; text-align: center; padding: 0 var(--gutter); }
.lede-sm { color: var(--ink-2); font-size: 1.1rem; max-width: 52ch; margin: 10px auto 30px; }
.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 16px; margin-bottom: 20px; }
.choice { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; text-align: left; padding: 22px; border-radius: var(--r-lg); border: 1px solid var(--line); background: rgba(255, 255, 255, .86); transition: transform .25s var(--ease), border-color .2s, background .2s; }
.choice:hover { transform: translateY(-4px); border-color: var(--c); background: var(--cl); }
.choice .ic-wrap { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 15px; background: var(--c); margin-bottom: 6px; }
.choice b { font: 500 1.2rem var(--font-display); letter-spacing: -.02em; }
.choice span:last-child { color: var(--ink-2); font-size: .95rem; }

/* progress page */
.prog-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; align-items: start; }
.prog-grid .level-card { grid-column: auto; }
.badge-row { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 210px), 1fr)); gap: 8px 18px; }
.badge { display: flex; align-items: center; gap: 12px; padding: 6px 0; }
.badge .disc { flex: none; width: 42px; height: 42px; border-radius: 50%; background: var(--c); display: grid; place-items: center; }
.badge b { display: block; font-weight: 600; line-height: 1.25; font-size: .95rem; } .badge small { color: var(--muted); font-size: .8rem; line-height: 1.3; display: block; }
.badge.locked { opacity: .42; } .badge.locked .disc { background: var(--line); }
.setting { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 12px 0; border-top: 1px solid var(--line); } .setting p { margin: 0; }

/* ====================== NOTEBOOK ====================== */
.nb-page { display: flex; flex-direction: column; gap: 12px; }
.nb-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.nb-head p { margin: 4px 0 0; }
.search { display: flex; align-items: center; gap: 10px; padding: 0 16px; min-height: 44px; border-radius: 999px; border: 1px solid var(--line-strong); background: #fff; color: var(--muted); }
.search:focus-within { border-color: var(--ink); color: var(--ink); }
.search input { flex: 1; min-width: 0; border: 0; outline: none; background: transparent; font: 400 1rem var(--font); color: var(--ink); height: 42px; }
.search.big { min-width: min(100%, 420px); }
.cat-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.nb-panes { display: grid; grid-template-columns: minmax(260px, 340px) minmax(0, 1fr); gap: 18px; height: calc(100dvh - 250px); min-height: 360px; }
.nb-list { overflow-y: auto; display: flex; flex-direction: column; gap: 2px; padding-right: 6px; }
.nb-item { display: flex; flex-direction: column; align-items: flex-start; text-align: left; gap: 1px; padding: 10px 14px; border: 0; border-radius: 14px; background: transparent; }
.nb-item b { font-weight: 600; font-size: .95rem; } .nb-item span { color: var(--muted); font-size: .84rem; line-height: 1.35; }
.nb-item:hover { background: rgba(30, 27, 46, .05); } .nb-item.active { background: var(--ink); color: #fff; } .nb-item.active span { color: rgba(255, 255, 255, .72); }
.nb-detail { overflow-y: auto; background: rgba(255, 255, 255, .86); border: 1px solid var(--line); border-radius: var(--r-lg); padding: 24px 28px; }
.nb-title { font-weight: 400; font-size: 2rem; letter-spacing: -.035em; margin: 8px 0 4px; }
.lede-sm.left { margin: 0; }
.nb-detail .lede-sm { margin: 0 0 14px; font-size: 1.05rem; }
.nb-back { display: none; margin-bottom: 8px; }
.syntax { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 10px 14px; border-radius: 14px; background: #F1EEF8; margin: 8px 0 14px; }
.syntax span { font-size: .78rem; color: var(--muted); font-weight: 600; } .syntax code { background: transparent; padding: 0; font-size: .95rem; }
.example { padding: 10px 14px; border-radius: 14px; background: var(--sky-l); }
.related { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 16px; font-size: .88rem; color: var(--muted); }
.related a.chip:hover { border-color: var(--ink); }
.entry { border-bottom: 1px solid var(--line); }
.entry-head { display: flex; align-items: center; gap: 12px; width: 100%; padding: 12px 6px; background: none; border: 0; text-align: left; }
.entry-main { flex: 1; min-width: 0; display: flex; flex-direction: column; } .entry-main b { font-weight: 600; } .entry-sum { color: var(--muted); font-size: .86rem; }
.entry-cat { font-size: .74rem; color: var(--muted); padding: 2px 9px; border-radius: 99px; border: 1px solid var(--line); white-space: nowrap; }
.entry-head .ic { transform: rotate(-90deg); transition: transform .2s; color: var(--muted); } .entry.open .entry-head .ic { transform: rotate(90deg); }
.entry-body { padding: 0 6px; } .entry.open .entry-body { padding: 0 6px 16px; animation: enter .25s var(--ease); }
.entry-body .prose { font-size: .96rem; }

/* help drawer */
.drawer { position: fixed; inset: 0; z-index: 80; pointer-events: none; }
.drawer .scrim { position: absolute; inset: 0; background: rgba(30, 27, 46, .28); opacity: 0; transition: opacity .25s; }
.drawer-panel { position: absolute; top: 0; right: 0; bottom: 0; width: min(100%, 460px); background: #FDFCFE; box-shadow: -30px 0 70px -30px rgba(30, 27, 46, .45); display: flex; flex-direction: column; gap: 12px; padding: 18px 20px; transform: translateX(104%); transition: transform .3s var(--ease); }
.drawer.open { pointer-events: auto; } .drawer.open .scrim { opacity: 1; } .drawer.open .drawer-panel { transform: none; }
.drawer-panel header { display: flex; align-items: center; justify-content: space-between; } .drawer-panel header h2 { display: flex; align-items: center; gap: 9px; font-size: 1.3rem; }
.drawer-body { flex: 1; overflow-y: auto; margin: 0 -8px; padding: 0 8px; }
.drawer-h { font: 500 .95rem var(--font-display); margin: 12px 0 4px; color: var(--ink-2); }
.drawer-panel footer { padding-top: 8px; border-top: 1px solid var(--line); font-size: .9rem; } .drawer-panel footer a { color: var(--ink-2); text-decoration: underline; text-underline-offset: 3px; }

/* toast + confetti */
#toasts { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); z-index: 90; display: flex; flex-direction: column; align-items: center; gap: 8px; pointer-events: none; }
.toast { display: inline-flex; align-items: center; gap: 10px; background: var(--ink); color: #fff; padding: 11px 20px; border-radius: 999px; box-shadow: 0 14px 40px -10px rgba(30, 27, 46, .5); animation: enter .3s var(--ease); white-space: nowrap; font-size: .95rem; }
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 70; overflow: hidden; }
.confetti i { position: absolute; top: -20px; width: 10px; height: 14px; border-radius: 3px; animation: fall linear forwards; }
.confetti i:nth-child(3n) { border-radius: 50%; width: 11px; height: 11px; }
@keyframes fall { to { transform: translateY(110vh) rotate(620deg); } }

/* ====================== RESPONSIVE ====================== */
@media (max-width: 1180px) {
  .dash { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .hero-card { grid-column: 1 / -1; } .level-card { grid-column: span 3; }
  .next-card, .path-card, .review-card, .badges-card { grid-column: span 3; }
  .two, .two.learn { grid-template-columns: minmax(0, 1fr); }
  .steps-layout { grid-template-columns: minmax(0, 1fr); }
  .steps-nav { flex-direction: row; overflow-x: auto; position: static; padding-bottom: 6px; } .sn { white-space: nowrap; } .sn span:last-child { display: none; } .sn.cur span:last-child { display: inline; }
}
@media (max-width: 980px) {
  /* the sidebar becomes a bottom tab bar */
  .shell { grid-template-columns: minmax(0, 1fr); }
  .side { position: fixed; z-index: 60; top: auto; left: 50%; bottom: max(12px, env(safe-area-inset-bottom)); transform: translateX(-50%); width: auto; max-width: calc(100vw - 20px); height: auto; flex-direction: row; gap: 0; padding: 6px; border: 1px solid rgba(30, 27, 46, .08); border-radius: 999px; background: rgba(255, 255, 255, .8); box-shadow: 0 14px 44px -10px rgba(30, 27, 46, .25); overflow: visible; }
  .brand, .nav-label, .subnav, .nav-count, .side-foot, .nav-item kbd { display: none; }
  .nav { flex-direction: row; gap: 2px; flex: none; } .nav-group { flex-direction: row; gap: 2px; }
  .nav-item { padding: 9px 12px; border-radius: 999px; } .nav-item .lab { display: none; } .nav-item.on .lab { display: inline; }
  .nav-item.in { background: transparent; }
  .lang-top { display: inline-flex; }
  main#app { padding-bottom: 110px; }
  .search-btn span, .search-btn kbd { display: none; } .search-btn { padding: 9px 11px; }
  .nb-panes { grid-template-columns: minmax(0, 1fr); height: auto; }
  .nb-panes .nb-detail { display: none; } .nb-panes.has-sel .nb-list { display: none; } .nb-panes.has-sel .nb-detail { display: block; }
  .nb-back { display: inline-flex; } .nb-list { max-height: 60dvh; }
  .prog-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .top { padding-top: 12px; } .crumbs { font-size: .9rem; } .crumbs a, .crumbs .sl { display: none; }
  .dash { grid-template-columns: minmax(0, 1fr); } .dash > * { grid-column: 1 / -1 !important; }
  .hero-card { flex-direction: column; } .hero-side { align-items: flex-start; }
  .stat { display: none; }
  .lhead { gap: 8px; } .stages li { font-size: .78rem; padding-right: 10px; }
  .step-actions { flex-direction: column-reverse; align-items: stretch; } .step-actions .btn { width: 100%; }
  .head-stat { align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; } }

/* ====================== SLIDES (the "Comprendre" step) ====================== */
.lbody { display: flex; flex-direction: column; }
div.lesson:not(.row) { min-height: calc(100dvh - 96px); }
.deck { flex: 1; display: flex; flex-direction: column; }
.deck-main { flex: 1; display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(24px, 4vw, 72px); align-items: center; padding: 6px 0 14px; }
.deck-text { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; min-width: 0; }
.deck-count { display: inline-flex; padding: 3px 13px; border-radius: 999px; background: var(--cl); border: 1px solid var(--c); font-size: .85rem; font-weight: 600; color: var(--ink); font-variant-numeric: tabular-nums; }
.deck-h { font-weight: 400; font-size: clamp(1.7rem, 2.7vw, 2.5rem); letter-spacing: -.035em; line-height: 1.06; }
.deck-p { font-size: clamp(1.08rem, 1.35vw, 1.28rem); line-height: 1.6; max-width: 46ch; }
.deck-p p { margin: 0 0 .7em; }
.deck-cue { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; min-height: 46px; margin-top: 6px; }
.cue { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: .95rem; }
.cue.try { color: var(--ink); background: var(--butter-l); border: 1px solid #F1E3A2; padding: 8px 14px; border-radius: 999px; font-weight: 500; }
.cue.try .ic { color: var(--butter-d); }
.cue.ok { color: var(--ok); font-weight: 500; }
.cue-btn { animation: nudge 1.4s var(--ease) infinite; }
.cue-btn kbd { background: rgba(255, 255, 255, .15); border-color: rgba(255, 255, 255, .4); color: #fff; }
@keyframes nudge { 0%, 100% { transform: none; } 50% { transform: translateY(-3px); } }
.deck-stage { min-width: 0; }
.in-r { animation: slideInR .38s var(--ease) both; }
.in-l { animation: slideInL .38s var(--ease) both; }
@keyframes slideInR { from { opacity: 0; transform: translateX(26px); } to { opacity: 1; transform: none; } }
@keyframes slideInL { from { opacity: 0; transform: translateX(-26px); } to { opacity: 1; transform: none; } }

.deck-win .formula { font-size: 1rem; min-height: 34px; }
.deck-win .sheet td { height: clamp(38px, calc((100dvh - 340px) / var(--rows, 5)), 62px); font-size: clamp(1rem, 1.25vw, 1.15rem); padding: 0 16px; }
.deck-win .sheet th.col { min-width: 96px; }
.deck-win .sheet th { height: 30px; }
.sheet td { position: relative; transition: background .25s, box-shadow .25s; cursor: default; }
.sheet td.sel { box-shadow: inset 0 0 0 2px var(--ink); }
.sheet td.target.empty { background: var(--cl); }
.sheet td.target.has, .sheet td.also.has { background: var(--mint-l); font-weight: 600; font-variant-numeric: tabular-nums; }
.sheet td.also { background: var(--mint-l); }
.sheet td.typing { overflow: visible; z-index: 4; background: #fff; }
.sheet td.typing .fc { position: absolute; left: 0; top: 0; bottom: 0; display: flex; align-items: center; padding: 0 14px; background: #fff; outline: 2px solid var(--cd); outline-offset: -2px; font: 500 .92em var(--font-mono); white-space: nowrap; }
.fc.err { color: var(--bad); }
.sheet td.flash { animation: flash .6s var(--ease); }
@keyframes flash { from { background: var(--butter); } }
.rf { border-radius: 5px; padding: 0 2px; font-weight: 600; }
.rf0, .rc0 { --rcol: var(--sky); --rink: var(--sky-d); --rbg: var(--sky-l); }
.rf1, .rc1 { --rcol: var(--rose); --rink: var(--rose-d); --rbg: var(--rose-l); }
.rf2, .rc2 { --rcol: var(--mint); --rink: var(--mint-d); --rbg: var(--mint-l); }
.rf3, .rc3 { --rcol: var(--butter); --rink: var(--butter-d); --rbg: var(--butter-l); }
.rf4, .rc4 { --rcol: var(--lilac); --rink: var(--lilac-d); --rbg: var(--lilac-l); }
.rf { color: var(--rink); background: var(--rbg); }
.sheet td.rc { background: var(--rbg); box-shadow: inset 0 0 0 2px var(--rcol); }
.sheet td.rc.sel { box-shadow: inset 0 0 0 2px var(--ink); }
.caret { display: inline-block; width: 2px; height: 1.1em; background: var(--ink); margin-left: 1px; vertical-align: middle; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.sheet td.editable { background: var(--butter-l); }
.sheet td.editable.rc { background: var(--rbg); }
.sheet td .ed { width: 100%; height: 100%; min-height: 40px; border: 0; background: transparent; font: inherit; color: var(--ink); text-align: inherit; padding: 0; outline: none; }
.sheet td.num .ed { text-align: right; }
.sheet td.editable:focus-within { box-shadow: inset 0 0 0 2px var(--ink); background: #fff; }
.sheet td .sfx { color: var(--muted); margin-left: 2px; }
.sheet td.editable { display: table-cell; }

.deck-nav { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; padding: 12px 0 2px; border-top: 1px solid var(--line); }
.deck-nav #dNext { justify-self: end; } .deck-nav #dPrev { justify-self: start; }
.dots { display: flex; gap: 7px; align-items: center; }
.dd { width: 26px; height: 8px; border: 0; padding: 0; border-radius: 99px; background: var(--line-strong); transition: background .3s, width .3s var(--ease); }
.dd.on { background: var(--cd); } .dd.cur { background: var(--ink); width: 44px; }
@media (max-width: 1180px) {
  .deck-main { grid-template-columns: minmax(0, 1fr); align-items: start; gap: 18px; }
}
@media (max-width: 640px) {
  .deck-nav { grid-template-columns: auto 1fr auto; } .deck-nav .btn.text { padding: 0 8px; } .dots { justify-content: center; } .dd { width: 14px; } .dd.cur { width: 26px; }
}
.quiz-card { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 4px; padding: 34px 28px; background: var(--cl); border-color: var(--c); }
.qc-n { font: 300 clamp(4.5rem, 9vw, 7rem)/1 var(--font-display); letter-spacing: -.06em; color: var(--ink); }
.qc-l { font: 500 1.2rem var(--font-display); margin-bottom: 8px; }
.quiz-card .qseg { justify-content: center; margin: 8px 0 14px; }
.quiz-card p { display: flex; align-items: center; gap: 8px; margin: 2px 0; }
.intro-split .prose.big { font-size: clamp(1.1rem, 1.4vw, 1.3rem); }
.beats { font-size: clamp(1.08rem, 1.3vw, 1.22rem); }

/* ====================== NOTEBOOK: needs, steps, mistakes ====================== */
.nb-needs { margin: 14px 0; padding: 12px 16px; border-radius: var(--r-md); background: var(--mint-l); }
.nb-needs b { display: flex; align-items: center; gap: 8px; font: 500 .98rem var(--font-display); margin-bottom: 4px; } .nb-needs b .ic { color: var(--mint-d); }
.nb-needs ul, .traps { margin: 4px 0 0; padding-left: 20px; display: grid; gap: 3px; font-size: .95rem; }
.stepper { margin: 16px 0; padding: 16px 18px; border-radius: var(--r-lg); background: #fff; border: 1px solid var(--line); }
.st-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 8px; }
.st-head h3 { font: 500 1.1rem var(--font-display); }
.st-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.st-step { display: none; gap: 14px; align-items: flex-start; }
.st-step.cur, .stepper.all .st-step { display: flex; animation: enter .3s var(--ease); }
.st-n { flex: none; display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--ink); color: #fff; font: 600 .9rem var(--font-display); margin-top: 2px; }
.stepper.all .st-step:not(.cur) .st-n { background: var(--c, var(--lilac)); color: var(--ink); }
.st-body { min-width: 0; } .st-body b { font: 500 1.08rem var(--font-display); display: block; margin-bottom: 2px; }
.st-body .prose { font-size: .98rem; } .st-body .prose p { margin: 0 0 .5em; }
.st-nav { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); }
.st-nav .dots { gap: 5px; } .st-nav .dd { width: 16px; height: 6px; display: inline-block; border-radius: 99px; background: var(--line-strong); } .st-nav .dd.on { background: var(--cd, var(--lilac-d)); } .st-nav .dd.cur { background: var(--ink); width: 26px; }
.stepper.all .st-nav { display: none; }