/* muffinenglish.com: the practice paper.
   Desk ground, one sheet of paper, one pen colour. The brand's orange and
   chocolate live only in the Muffin art; the page's one accent is the
   marking pen. */

:root {
  --sc-canvas:     #DCE5D8;   /* the desk */
  --sc-surface:    #FBFCF9;   /* the paper */
  --sc-ink:        #0C2D22;   /* app's textDark */
  --sc-ink-soft:   #46604F;
  --sc-accent:     #11663F;   /* the marking pen */
  --sc-accent-ink: #FBFCF9;
  --sc-font-display: "Archivo", system-ui, sans-serif;
  --sc-font-text:    "Geist", system-ui, sans-serif;
  --sc-shadow-color: 140 30% 18%;

  --paper-w: min(100% - 2 * var(--sc-gutter), 54rem);
  --rule: color-mix(in oklab, var(--sc-ink) 14%, transparent);
  --bar-h: 3.5rem;
}

body { padding-bottom: calc(var(--bar-h) + env(safe-area-inset-bottom)); }

.vh {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}
.skip {
  position: fixed; left: var(--sc-4); top: var(--sc-4); z-index: 80;
  padding: var(--sc-2) var(--sc-4); background: var(--sc-ink); color: var(--sc-surface);
  border-radius: var(--sc-r-sm); transform: translateY(-200%);
}
.skip:focus-visible { transform: none; }

/* ------------------------------------------------------------ the paper -- */
/* No z-index, transform or opacity on .paper or its acts: the back sheet and
   Muffin sit at negative z-index and must paint BELOW the paper's own
   background, which only works while no ancestor forms a stacking context. */
.paper {
  position: relative;
  width: var(--paper-w);
  margin: clamp(9rem, 15vw, 13rem) auto 0;
  background: var(--sc-surface);
  border-radius: 3px;
  box-shadow: var(--sc-e2), var(--sc-e3);
}

.hero { position: relative; padding: clamp(2rem, 5vw, 3.5rem) clamp(1.25rem, 5vw, 4rem) var(--sc-7); }

.sheet-back {
  position: absolute; z-index: -2;
  top: -0.9rem; right: -1.6rem; width: 70%; height: 22rem;
  background: #EEF2EA; border-radius: 3px;
  box-shadow: var(--sc-e2);
  rotate: 2.6deg;
}
.hero-muffin {
  position: absolute; z-index: -1;
  /* Right edge stays INSIDE the paper: only the head may show, above the top
     edge. Past the side edge, an arm would show between the sheets, cut off. */
  right: clamp(0.75rem, 3vw, 3rem); top: clamp(-11.5rem, -16vw, -8rem);
  width: clamp(10rem, 22vw, 17rem); height: auto; max-width: none;
}
.pencil {
  position: absolute; z-index: 5;
  left: -3.2rem; bottom: 1.4rem; width: 15rem; height: auto; max-width: none;
  rotate: -7deg;
  filter: drop-shadow(0 6px 6px hsl(var(--sc-shadow-color) / 0.22));
}

.paper__head {
  max-width: 34rem;
  padding-bottom: var(--sc-6);
  border-bottom: 1px solid var(--rule);
  margin-bottom: var(--sc-7);
}
.wordmark {
  margin: 0 0 var(--sc-5);
  font-family: var(--sc-font-display); font-weight: 750;
  font-stretch: 112%; letter-spacing: var(--sc-track-wide); text-transform: uppercase;
  font-size: var(--sc-t-sm); color: var(--sc-accent);
}
.paper__head h1 {
  margin: 0;
  font-family: var(--sc-font-display); font-weight: 720; font-stretch: 92%;
  font-size: clamp(2rem, 1.4rem + 2.6vw, 3.25rem);
  line-height: 1.04; letter-spacing: var(--sc-track-tight);
  text-wrap: balance;
}
.lede { margin: var(--sc-4) 0 0; color: var(--sc-ink-soft); max-width: 30rem; text-wrap: pretty; }

/* ------------------------------------------------------------ questions -- */
.qsec { padding: 0 clamp(1.25rem, 5vw, 4rem) var(--sc-7); }
.qsec + .qsec, .hero + .qsec { padding-top: var(--sc-7); border-top: 1px solid var(--rule); }

.q {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr) 7.5rem;
  gap: 0 var(--sc-5);
  align-items: start;
}
.q__num {
  margin: 0.15rem 0 0;
  font-family: var(--sc-font-display); font-weight: 800; font-size: var(--sc-t-xl);
  line-height: 1; color: var(--sc-ink);
  font-variant-numeric: tabular-nums;
}
.q__meta {
  margin: 0;
  font-family: var(--sc-font-display); font-weight: 560; font-stretch: 108%;
  font-size: var(--sc-t-xs); letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--sc-ink-soft); line-height: 1.5;
}
.q__meta b { color: var(--sc-ink); font-weight: 760; margin-right: 0.5em; }
.q__task { margin: var(--sc-2) 0 0; font-size: var(--sc-t-sm); color: var(--sc-ink-soft); }
.q__sentence {
  margin: var(--sc-5) 0 0;
  font-size: var(--sc-t-lg); line-height: 2.1; letter-spacing: -0.01em;
  max-width: 40ch; text-wrap: pretty;
}
.q__key {
  display: inline-block; margin-left: 0.35em;
  font-family: var(--sc-font-display); font-weight: 760; font-stretch: 110%;
  font-size: 0.8em; letter-spacing: 0.08em;
  padding: 0 0.5em; border: 1.5px solid var(--sc-ink); border-radius: 2px; line-height: 1.6;
}

/* the gap: a written line, not a form field */
.gap {
  font: inherit; color: var(--sc-accent); font-weight: 600;
  line-height: 1.35; height: 1.6em; max-width: 100%; vertical-align: baseline;
  min-width: 4ch; padding: 0 0.15em; margin: 0 0.1em;
  border: 0; border-bottom: 2px solid var(--sc-ink); border-radius: 0;
  background: color-mix(in oklab, var(--sc-accent) 5%, transparent);
  transition: background-color 160ms var(--sc-ease-out), border-color 160ms var(--sc-ease-out);
}
.gap:hover { background: color-mix(in oklab, var(--sc-accent) 9%, transparent); }
.gap:focus-visible { outline: none; border-bottom-color: var(--sc-accent); background: color-mix(in oklab, var(--sc-accent) 11%, transparent); }
.gap--static { display: inline-block; width: 6ch; height: 1.1em; vertical-align: -0.15em; background: none; }
.gap--long { min-width: 14ch; }

.mark {
  margin-top: var(--sc-4);
  font-family: var(--sc-font-display); font-weight: 700; font-size: var(--sc-t-sm);
  letter-spacing: 0.01em;
  padding: 0.55rem 1rem; border-radius: var(--sc-r-sm);
  border: 1.5px solid var(--sc-ink); background: transparent; color: var(--sc-ink);
  cursor: pointer;
  transition: background-color 140ms var(--sc-ease-out), color 140ms var(--sc-ease-out), transform 120ms var(--sc-ease-out);
}
@media (hover: hover) and (pointer: fine) { .mark:hover { background: var(--sc-ink); color: var(--sc-surface); } }
.mark:active { transform: translateY(1px); }
.mark:disabled { opacity: 0.45; cursor: not-allowed; }

.q__fb { margin: var(--sc-3) 0 0; min-height: 1.6em; font-size: var(--sc-t-sm); color: var(--sc-ink-soft); max-width: 46ch; }
.q__fb strong { color: var(--sc-ink); }

/* -------------------------------------------- lozenges, the answer sheet -- */
.lozenges { border: 0; padding: 0; margin: var(--sc-5) 0 0; display: flex; flex-wrap: wrap; gap: var(--sc-3) var(--sc-6); }
.lozenges label {
  position: relative; display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: var(--sc-t-base); cursor: pointer; min-height: 44px;
}
.lozenges label b { font-family: var(--sc-font-display); font-weight: 760; }
.lozenges input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.lz {
  position: relative; width: 2.1rem; height: 1rem; border-radius: 999px;
  border: 1.5px solid var(--sc-ink); overflow: hidden; flex: none;
}
/* shading the lozenge in pencil: a wipe, left to right */
.lz::after {
  content: ""; position: absolute; inset: 0; background: var(--sc-ink);
  clip-path: inset(0 100% 0 0); transition: clip-path 260ms var(--sc-ease-out);
}
.lozenges input:checked + .lz::after { clip-path: inset(0 0 0 0); }
.lozenges input:focus-visible + .lz { outline: 2px solid var(--sc-accent); outline-offset: 3px; }

/* ------------------------------------------ the margin marker (signature) -- */
.q__margin { position: relative; display: grid; justify-items: center; padding-top: var(--sc-5); }
.q__muffin {
  width: 6.5rem; height: auto; opacity: 0; transform: translateY(6px) scale(0.95);
  transition: opacity 220ms var(--sc-ease-out), transform 220ms var(--sc-ease-out);
}
.stroke { width: 3.4rem; height: 3.4rem; overflow: visible; margin-bottom: -0.6rem; position: relative; z-index: 1; }
.stroke path, .pip svg path {
  fill: none; stroke: var(--sc-accent); stroke-width: 7; stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 1; stroke-dashoffset: 1;
}
.is-right .stroke__tick, .is-wrong .stroke__cross { stroke-dashoffset: 0; transition: stroke-dashoffset 380ms var(--sc-ease-out) 60ms; }
.is-marked .q__muffin { opacity: 1; transform: none; }
.is-wrong .q__fb strong { color: var(--sc-ink); }

/* ----------------------------------------------------------- the peak -- */
.peak { position: relative; }
.peak__stage { background: var(--sc-surface); display: grid; place-items: center; }
.peak__silence {
  position: absolute; inset: 0; display: grid; place-items: center; margin: 0;
  font-family: var(--sc-font-display); font-weight: 720; font-stretch: 92%;
  font-size: var(--sc-t-2xl); letter-spacing: var(--sc-track-tight); color: var(--sc-ink);
}
.q--peak { width: 100%; padding: 0 clamp(1.25rem, 5vw, 4rem); }
.kwt { position: relative; }
.kwt__links { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.kwt__links path { fill: none; stroke: var(--sc-accent); stroke-width: 1.75; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; }
.kwt__s1 { margin: var(--sc-5) 0 0; font-size: var(--sc-t-lg); line-height: 1.7; max-width: 40ch; }
.kwt__key {
  margin: var(--sc-6) 0 0; display: inline-block;
  font-family: var(--sc-font-display); font-weight: 800; font-stretch: 115%;
  text-transform: uppercase; letter-spacing: 0.12em; font-size: var(--sc-t-lg);
  padding: 0.1em 0.6em; border: 2px solid var(--sc-ink); border-radius: 2px;
  position: relative; z-index: 1; background: var(--sc-surface); /* links pass behind it */
}
.kwt__s2 { margin-top: var(--sc-6); }
.w { position: relative; }

/* Scroll choreography, all from the act's --sc-p (0 to 1) over a 5.5 span:
   0.09 the question arrives · 0.18-0.70 the three links draw one after
   another and each target word lands · 0.72-0.80 the key word stamps ·
   after that the paper holds and the gap is yours.
   Every step also EASES toward its scroll position (transitions below), so a
   fast flick still plays the drawing out instead of jumping to the end. */
.peak { --a: clamp(0, (var(--sc-p, 1) - 0.18) / 0.16, 1);
        --b: clamp(0, (var(--sc-p, 1) - 0.36) / 0.16, 1);
        --c: clamp(0, (var(--sc-p, 1) - 0.54) / 0.16, 1);
        --k: clamp(0, (var(--sc-p, 1) - 0.72) / 0.08, 1); }
.kwt__links path { transition: stroke-dashoffset 820ms var(--sc-ease-out); }
.w--build { transition: opacity 700ms var(--sc-ease-out); }
.kwt__key { transition: opacity 520ms var(--sc-ease-out), transform 640ms var(--sc-ease-out); }
/* The engine writes the wipe's clip-path every frame; easing it means a flick
   shows the paper turning rather than a finished frame. Opacity-only rule for
   parallax planes does not apply: this element is not a parallax plane. */
.wipe { transition: clip-path 700ms var(--sc-ease-out); }
.kwt__links [data-link="film"] { stroke-dashoffset: calc(1 - var(--a)); }
.kwt__links [data-link="succ"] { stroke-dashoffset: calc(1 - var(--b)); }
.kwt__links [data-link="who"]  { stroke-dashoffset: calc(1 - var(--c)); }
.w--build[data-to="film"] { opacity: calc(0.12 + 0.88 * var(--a)); }
.w--build[data-to="succ"] { opacity: calc(0.12 + 0.88 * var(--b)); }
.w--build[data-to="who"]  { opacity: calc(0.12 + 0.88 * var(--c)); }
.w[data-from="film"] { background: linear-gradient(transparent 62%, color-mix(in oklab, var(--sc-accent) calc(var(--a) * 22%), transparent) 0); }
.w[data-from="succ"] { background: linear-gradient(transparent 62%, color-mix(in oklab, var(--sc-accent) calc(var(--b) * 22%), transparent) 0); }
.w[data-from="who"]  { background: linear-gradient(transparent 62%, color-mix(in oklab, var(--sc-accent) calc(var(--c) * 22%), transparent) 0); }
.kwt__key { opacity: var(--k); transform: scale(calc(1.18 - 0.18 * var(--k))); transform-origin: left center; }

/* ----------------------------------------------------------- the marks -- */
/* Straight after the pinned peak: short top padding, or the stage's exit
   slide plus full section padding leaves a near-empty screen. */
.marks { padding-inline: clamp(1.25rem, 5vw, 4rem); padding-block: var(--sc-6) var(--sc-7); border-top: 1px solid var(--rule); }
.marks__grid { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--sc-2) var(--sc-7); align-items: end; }
.marks__h {
  grid-column: 1 / -1; margin: 0;
  font-family: var(--sc-font-display); font-weight: 560; font-stretch: 108%;
  font-size: var(--sc-t-xs); letter-spacing: 0.06em; text-transform: uppercase; color: var(--sc-ink-soft);
}
.marks__score { margin: 0; display: flex; align-items: baseline; gap: 0.4rem; color: var(--sc-accent); }
.marks__n {
  font-family: var(--sc-font-display); font-weight: 800; font-stretch: 90%;
  font-size: clamp(4.5rem, 3rem + 7vw, 8.5rem); line-height: 0.9; letter-spacing: -0.05em;
  font-variant-numeric: tabular-nums; padding-top: 0.08em;
}
.marks__of { font-family: var(--sc-font-display); font-weight: 650; font-size: var(--sc-t-xl); color: var(--sc-ink); }
/* Unknown is "--" (CLAUDE.md), set quietly: at display size in the accent it
   read as two solid bars, which looks like a broken placeholder. */
.marks__n.is-unknown { color: var(--sc-ink-soft); font-weight: 500; font-size: clamp(3rem, 2rem + 4vw, 5rem); letter-spacing: 0.04em; }
.marks__rule { margin: 0; font-size: var(--sc-t-lg); line-height: 1.45; max-width: 30ch; text-wrap: pretty; }
.marks__note { grid-column: 1 / -1; margin: var(--sc-6) 0 0; color: var(--sc-ink-soft); font-size: var(--sc-t-sm); max-width: 62ch; }

/* ----------------------------------------------------------- the close -- */
.close { padding-inline: clamp(1.25rem, 5vw, 4rem); padding-block: var(--sc-8) var(--sc-5); border-top: 1px solid var(--rule); }
.close__h {
  margin: 0; max-width: 22ch;
  font-family: var(--sc-font-display); font-weight: 720; font-stretch: 92%;
  font-size: var(--sc-t-2xl); line-height: 1.04; letter-spacing: var(--sc-track-tight); text-wrap: balance;
}
.lozenges--exam { margin-top: var(--sc-6); gap: var(--sc-3) var(--sc-6); }
.close__line { margin: var(--sc-7) 0 var(--sc-4); font-size: var(--sc-t-lg); }
.cta {
  display: inline-block; text-decoration: none;
  font-family: var(--sc-font-display); font-weight: 720; font-size: var(--sc-t-base);
  padding: 0.9rem 1.4rem; border-radius: var(--sc-r-sm);
  background: var(--sc-accent); color: var(--sc-accent-ink);
  box-shadow: var(--sc-e1);
  transition: transform 140ms var(--sc-ease-out), box-shadow 140ms var(--sc-ease-out);
}
@media (hover: hover) and (pointer: fine) { .cta:hover { transform: translateY(-1px); box-shadow: var(--sc-e2); } }
.cta:active { transform: translateY(1px); }
.close__small { margin: var(--sc-3) 0 0; font-size: var(--sc-t-xs); color: var(--sc-ink-soft); }
.foot { margin-top: var(--sc-9); padding-top: var(--sc-5); border-top: 1px solid var(--rule); font-size: var(--sc-t-xs); color: var(--sc-ink-soft); }
.foot__links { display: flex; gap: var(--sc-5); margin: 0; }
.foot__links a { color: var(--sc-ink); min-height: 44px; display: inline-flex; align-items: center; }
.foot__fine { margin: var(--sc-2) 0 0; max-width: 70ch; }

/* ------------------------------------------- app chrome: the status bar -- */
.bar {
  position: fixed; inset: auto 0 0 0; z-index: 60;
  height: calc(var(--bar-h) + env(safe-area-inset-bottom));
  padding: 0 var(--sc-gutter) env(safe-area-inset-bottom);
  display: flex; align-items: center; gap: var(--sc-5);
  background: var(--sc-ink); color: var(--sc-surface);
  font-size: var(--sc-t-sm);
}
.bar a { color: inherit; text-decoration: none; }
.bar :focus-visible { outline-color: #9FE0B8; }
.bar__brand { display: flex; align-items: center; gap: var(--sc-2); font-family: var(--sc-font-display); font-weight: 720; }
.bar__brand img { width: 1.9rem; height: auto; }
.bar__pips { list-style: none; display: flex; gap: var(--sc-2); margin: 0 0 0 auto; padding: 0; }
.pip {
  position: relative; display: grid; place-items: center;
  width: 2.25rem; height: 2.25rem; border-radius: 50%;
  border: 1.5px solid color-mix(in oklab, var(--sc-surface) 45%, transparent);
  font-family: var(--sc-font-display); font-weight: 700; font-variant-numeric: tabular-nums;
  transition: background-color 160ms var(--sc-ease-out);
}
.pip svg { position: absolute; inset: 0.35rem; width: calc(100% - 0.7rem); height: calc(100% - 0.7rem); overflow: visible; }
.pip svg path { stroke: var(--sc-ink); stroke-width: 9; }
.pip.is-marked { background: var(--sc-surface); border-color: var(--sc-surface); }
.pip.is-marked span { opacity: 0; }
@media (hover: hover) and (pointer: fine) { .pip:hover { background: color-mix(in oklab, var(--sc-surface) 16%, transparent); } .pip.is-marked:hover { background: var(--sc-surface); } }
.bar__count { margin: 0; font-variant-numeric: tabular-nums; white-space: nowrap; }
.bar__status { margin: 0; white-space: nowrap; color: color-mix(in oklab, var(--sc-surface) 72%, transparent); }

/* ------------------------------------------------------------- phones -- */
@media (max-width: 760px) {
  :root { --paper-w: calc(100% - 1.25rem); --bar-h: 3.25rem; }
  .paper { margin-top: 7.5rem; }
  .hero-muffin { width: 8.25rem; top: -6.4rem; right: 0.25rem; }
  .sheet-back { width: 80%; height: 14rem; right: 0.35rem; rotate: 2deg; }
  .gap--long { width: 100%; min-width: 0; margin: 0.2em 0; }
  .pencil { display: none; }
  .paper__head { padding-right: 0; }
  .q { grid-template-columns: 1.6rem minmax(0, 1fr); }
  .q__margin { grid-column: 2; grid-row: 2; justify-items: start; justify-content: start; grid-template-columns: auto auto; align-items: center; gap: var(--sc-3); padding-top: var(--sc-2); }
  .q__muffin { width: 4.5rem; }
  .stroke { width: 2.4rem; height: 2.4rem; margin: 0; }
  .q__sentence { line-height: 2; }
  .marks__grid { grid-template-columns: 1fr; align-items: start; }
  .bar { gap: var(--sc-3); }
  .bar__brand span, .bar__status { display: none; }
  .pip { width: 2.1rem; height: 2.1rem; }
}
@media (max-width: 380px) {
  .bar__count { font-size: var(--sc-t-xs); }
}

/* Reduced motion: the peak is shown complete, nothing travels. */
@media (prefers-reduced-motion: reduce) {
  .peak { --a: 1; --b: 1; --c: 1; --k: 1; }
  .q__muffin, .lz::after, .stroke path, .pip svg path,
  .kwt__links path, .w--build, .kwt__key, .wipe { transition: none !important; }
}