/* Navyk web client · style D «Тетрадь-конфетти».
   Tokens mirror design/tokens.json (source of truth). Mobile-first; light theme only (owner decision 2026-10-13).
   Colour never carries meaning alone: right/wrong also differ by icon, text and weight. */

:root {
  /* colour: design/tokens.json color.light */
  --ink: #22223b;
  --ink-muted: #4a4a68;
  --ink-soft: #5e5b7a;
  --paper: #fffdf8;
  --paper-dot: #e4ddcf;
  --surface: #ffffff;
  --frame: #ede6da;
  --border: #22223b;
  --border-soft: #8e8ba8;
  --action: #ffb020;
  --on-action: #22223b;
  --action-shadow: #22223b;
  --success: #c9f2e0;
  --success-strong: #7cd9b0;
  --highlight: #fff0a3;
  --streak: #ffd6e7;
  --improve: #ffd6e7;
  --brand-dot: #ff5fa2;
  --info: #cfe5ff;
  --repeat: #e6dbff;
  --wrong: #ffd6e7;
  --focus: #4078c4;

  /* derived (checked in tools/contrast.mjs) */
  --focus-ring: var(--focus);
  --locked-border: var(--border-soft);
  --confetti-4: #9b7bff;
  --progress-end: color-mix(in srgb, var(--action) 55%, var(--highlight));

  /* font: tokens.font */
  --font: Nunito, system-ui, -apple-system, "Segoe UI", sans-serif;
  --fs-caption: 0.8125rem; /* 13 */
  --fs-small: 0.875rem; /* 14 */
  --fs-body: 1rem; /* 16 */
  --fs-lead: 1.0625rem; /* 17 */
  --fs-h3: 1.1875rem; /* 19 */
  --fs-h2: 1.5rem; /* 24 */
  --fs-h1: 1.875rem; /* 30 */
  --fs-score: 1.625rem; /* 26 */
  --lh-body: 1.45;
  --lh-heading: 1.2;

  /* radius, border, shadow, space: tokens.radius / border / shadow / space */
  --r-chip: 12px;
  --r-control: 16px;
  --r-card: 20px;
  --r-hero: 24px;
  --r-node: 999px;
  --bw: 2px;
  --bw-strong: 3px;
  --press-button: 0 5px 0 var(--action-shadow);
  --press-card: 0 4px 0 var(--border);
  --s-xs: 4px;
  --s-s: 8px;
  --s-m: 12px;
  --s-l: 16px;
  --s-xl: 20px;
  --s-xxl: 24px;
  --touch: 44px;

  --paper-pattern: radial-gradient(var(--paper-dot) 1.3px, transparent 1.3px) 0 0 / 22px 22px, var(--paper);
  --paper-glass: color-mix(in srgb, var(--paper) 92%, transparent);
  --col: 560px;
  color-scheme: light;
}

/* ---------- base ---------- */

*,
*::before,
*::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper-pattern);
  color: var(--ink);
  font: 600 var(--fs-body) / var(--lh-body) var(--font);
  min-height: 100vh;
  min-height: 100dvh;
}

h1, h2, h3 { margin: 0; line-height: var(--lh-heading); font-weight: 900; }
p { margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--ink); text-decoration-thickness: 2px; text-underline-offset: 0.2em; }
strong, b { font-weight: 800; }

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}
[tabindex="-1"]:focus { outline: none; }

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip {
  position: absolute; left: 0.5rem; top: -4rem; z-index: 10;
  background: var(--ink); color: var(--paper);
  min-height: var(--touch); padding: 0.6rem 1rem; border-radius: var(--r-chip); font-weight: 800;
}
.skip:focus { top: 0.5rem; }

.icon { width: 1.25em; height: 1.25em; flex: none; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }

/* highlighter marker under key words (tokens.patterns.highlighter) */
.hl {
  --hl: var(--highlight);
  background: linear-gradient(transparent 55%, var(--hl) 55%);
  padding: 0 3px;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
.hl--ok { --hl: var(--success); }
.hl--improve { --hl: var(--improve); }

/* sticker label (tokens.patterns.sticker) */
.sticker {
  display: inline-block; padding: 4px 10px;
  border: var(--bw) solid var(--border); border-radius: 10px;
  background: var(--surface); color: var(--ink);
  font-size: var(--fs-caption); font-weight: 900; line-height: 1.2;
  text-transform: uppercase; letter-spacing: 0.02em; white-space: nowrap;
  transform: rotate(-3deg);
}

/* confetti dots on success screens (tokens.patterns.confetti); purely decorative */
.confetti { position: absolute; inset: 0; pointer-events: none; }
.confetti i { position: absolute; display: block; border-radius: 5px; }
.confetti i:nth-child(1) { top: 10px; right: 14px; width: 10px; height: 10px; background: var(--brand-dot); }
.confetti i:nth-child(2) { top: 40%; right: 8px; width: 7px; height: 13px; border-radius: 3px; background: var(--focus); transform: rotate(30deg); }
.confetti i:nth-child(3) { bottom: 10px; right: 22px; width: 12px; height: 6px; border-radius: 3px; background: var(--success-strong); transform: rotate(-20deg); }
.confetti i:nth-child(4) { bottom: 8px; right: 52%; width: 8px; height: 8px; background: var(--confetti-4); }
.confetti i:nth-child(5) { top: 10px; left: 14px; width: 12px; height: 6px; border-radius: 3px; background: var(--brand-dot); transform: rotate(24deg); }
@media (prefers-reduced-motion: no-preference) {
  .confetti i { animation: confetti-pop 0.6s cubic-bezier(0.2, 1.5, 0.4, 1) both; }
  .confetti i:nth-child(2) { animation-delay: 0.06s; }
  .confetti i:nth-child(3) { animation-delay: 0.12s; }
  .confetti i:nth-child(4) { animation-delay: 0.18s; }
  .confetti i:nth-child(5) { animation-delay: 0.24s; }
  @keyframes confetti-pop { from { opacity: 0; translate: 0 10px; scale: 0.3; } }
}

#app { max-width: var(--col); margin: 0 auto; min-height: 100vh; min-height: 100dvh; }

.screen { display: flex; flex-direction: column; min-height: 100vh; min-height: 100dvh; padding: 0 var(--s-xl); }
.screen > main { flex: 1; }

.offline-banner { display: none; }
.is-offline .offline-banner {
  display: block; text-align: center; font-size: var(--fs-small); font-weight: 700;
  background: var(--highlight); color: var(--ink); padding: 0.5rem 1rem;
  border-bottom: var(--bw) solid var(--border);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  min-height: 52px; padding: 0.7rem 1.25rem;
  border-radius: var(--r-card); border: var(--bw) solid var(--border);
  background: var(--surface); color: var(--ink);
  font-weight: 800; font-size: var(--fs-body); line-height: 1.2; cursor: pointer; text-decoration: none;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.btn--primary {
  min-height: 58px; border-width: var(--bw-strong);
  background: var(--action); color: var(--on-action);
  font-size: var(--fs-h3); font-weight: 900;
  box-shadow: var(--press-button); margin-bottom: 5px;
}
.btn--primary:active:not(:disabled) { transform: translateY(5px); box-shadow: 0 0 0 var(--action-shadow); transition-duration: 0.05s; }
.btn--accent { background: var(--action); color: var(--on-action); box-shadow: 0 3px 0 var(--action-shadow); }
.btn--ghost { background: var(--surface); color: var(--ink); }
.btn--ghost { box-shadow: 0 3px 0 var(--border); margin-bottom: 3px; }
.btn--ghost:active:not(:disabled) { transform: translateY(3px); box-shadow: 0 0 0 var(--border); transition-duration: 0.05s; }
@media (hover: hover) and (pointer: fine) {
  .btn--primary:hover:not(:disabled):not(:active) { transform: translateY(-2px); box-shadow: 0 7px 0 var(--action-shadow); }
  .btn--ghost:hover:not(:disabled):not(:active) { transform: translateY(-1px); box-shadow: 0 4px 0 var(--border); background: var(--paper); }
  .chip:hover:not(:disabled):not(:active):not(.chip--placed) { transform: translateY(-1px); box-shadow: 0 4px 0 var(--border); }
  .option:hover:not(:disabled):not([aria-pressed="true"]) { background: var(--paper); transform: translateY(-1px); box-shadow: 0 3px 0 var(--border); }
  button.node:hover .node__dot { transform: translateY(-2px); }
}
.btn:disabled {
  cursor: not-allowed; background: var(--frame); color: var(--ink-muted);
  border-color: var(--border-soft); box-shadow: none; transform: none;
}
.btn--primary:disabled { margin-bottom: 5px; }
.btn--wide { width: 100%; }
.btn--small { min-height: var(--touch); padding: 0.4rem 0.9rem; font-size: var(--fs-small); border-radius: var(--r-control); }

.icon-btn {
  display: inline-grid; place-items: center;
  width: var(--touch); height: var(--touch); border-radius: var(--r-node);
  border: 0; background: transparent; color: var(--ink); cursor: pointer;
}
.icon-btn .icon { stroke-width: 2.6; }
.icon-btn:hover:not(:disabled) { background: var(--frame); }
.icon-btn:disabled { color: var(--border-soft); cursor: default; }

/* ---------- top bar & footer ---------- */

.topbar {
  position: sticky; top: 0; z-index: 3;
  display: flex; align-items: center; gap: var(--s-s);
  padding: var(--s-m) 0; background: var(--paper-glass);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.wordmark { font-size: 1.625rem; font-weight: 900; line-height: 1; letter-spacing: -0.01em; margin-right: auto; }
.wordmark__dot { color: var(--brand-dot); }
.stats { display: flex; gap: 6px; }
.stat {
  display: inline-flex; align-items: center; gap: 5px;
  height: 36px; padding: 0 10px; border-radius: 18px;
  border: var(--bw) solid var(--border); background: var(--surface);
  font-weight: 800; font-size: 0.9375rem; white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.stat .icon { width: 16px; height: 16px; }
.stat--streak { background: var(--streak); }
.stat--streak.is-active .icon { fill: var(--brand-dot); stroke: var(--ink); }
.stat--xp { background: var(--highlight); }
.stat--xp .icon { display: none; }
.stat__unit { font-weight: 800; }

.lang__select {
  min-height: var(--touch); max-width: 9rem; padding: 0 0.4rem;
  border-radius: var(--r-chip); border: var(--bw) solid var(--border);
  background: var(--surface); font-size: var(--fs-small); font-weight: 700;
}
/* compact chip: the real <select> lies transparently on top, so the system picker opens on tap */
.lang--compact { position: relative; flex: none; width: var(--touch); height: var(--touch); display: grid; place-items: center; }
.lang__chip {
  display: grid; place-items: center; width: 40px; height: 36px; border-radius: var(--r-chip);
  border: var(--bw) solid var(--border); background: var(--surface); font-size: var(--fs-caption); font-weight: 900; letter-spacing: 0.02em;
}
.lang--compact .lang__select { position: absolute; inset: 0; width: 100%; max-width: none; opacity: 0.001; cursor: pointer; font-size: 16px; }
.lang--compact:focus-within .lang__chip { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.lang--full { display: flex; flex-direction: column; gap: 6px; }

.avatar-btn {
  flex: none; display: grid; place-items: center; width: var(--touch); height: var(--touch);
  padding: 0; border: 0; border-radius: var(--r-node); background: none; color: var(--ink); cursor: pointer;
}
.avatar {
  display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%;
  border: var(--bw) solid var(--border); background: var(--repeat); font-weight: 900; font-size: var(--fs-body); line-height: 1;
  box-shadow: 0 2px 0 var(--border); transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.avatar-btn--guest .avatar { background: var(--surface); }
.avatar .icon { width: 20px; height: 20px; }
.avatar-btn:active .avatar { transform: translateY(2px); box-shadow: 0 0 0 var(--border); }
.avatar--big { width: 56px; height: 56px; font-size: var(--fs-h2); box-shadow: var(--press-card); }
@media (max-width: 380px) {
  .topbar { gap: 4px; }
  .wordmark { font-size: 1.375rem; }
  .stat { padding: 0 7px; gap: 3px; }
  .stats { gap: 4px; }
}

.site-footer {
  padding: 2rem 0 calc(1.5rem + env(safe-area-inset-bottom));
  font-size: var(--fs-small); color: var(--ink-muted); text-align: center;
}
.about { margin-top: 0.25rem; }
.about p { text-align: left; margin-top: 0.5rem; }
.site-footer .about summary { min-width: var(--touch); color: var(--ink); font-weight: 800; display: inline-flex; align-items: center; text-decoration: underline 2px; text-underline-offset: 0.2em; }

/* ---------- path ---------- */

.path { padding: var(--s-s) 0 var(--s-l); }
.path__checking { color: var(--ink-muted); font-size: var(--fs-small); margin-bottom: var(--s-l); }

/* the road: one SVG line behind every node and signpost (geometry in engine/road.js) */
.road { position: relative; padding-bottom: var(--s-xl); }
.road__svg { position: absolute; left: 0; top: 0; z-index: 0; overflow: visible; pointer-events: none; }
.road__svg path { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.road__todo { stroke: var(--ink-soft); stroke-width: 4; stroke-dasharray: 2 13; }
.road__done-edge { stroke: var(--border); stroke-width: 14; }
.road__done { stroke: var(--success-strong); stroke-width: 9; }
.road .level, .road .module, .road .nodes { position: relative; z-index: 1; }

.module + .module, .level + .level { margin-top: 40px; }
/* module header = a signpost standing on the road */
.module__head {
  position: relative; display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center;
  width: min(100%, 330px); margin: 0 auto var(--s-xxl); padding: 12px 18px 14px;
  background: var(--surface); border: var(--bw) solid var(--border); border-radius: var(--r-card);
  box-shadow: var(--press-card);
}
.module__head.is-done { background: var(--success); }
.module__kicker { font-size: var(--fs-small); font-weight: 800; color: var(--ink-muted); }
.module__title { font-size: var(--fs-h2); line-height: 1.15; }
.module__title { background: linear-gradient(transparent 58%, var(--highlight) 58%); padding: 0 4px; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.module__head.is-done .module__title { background: none; }

.segments { display: flex; gap: 6px; width: 100%; margin-top: 4px; }
.segments__item {
  flex: 1; height: 10px; border-radius: 5px;
  background: var(--surface); border: var(--bw) solid var(--border);
}
.segments__item.is-done { background: var(--success-strong); }

.save-banner {
  display: flex; align-items: center; gap: var(--s-m); margin: 0 0 var(--s-xl); padding: 10px 10px 10px 14px;
  border: var(--bw) dashed var(--border); border-radius: var(--r-control); background: var(--surface);
}
.save-banner__icon { width: 26px; height: 26px; }
.save-banner__text { flex: 1; font-size: var(--fs-small); font-weight: 700; line-height: 1.35; }
.save-banner__btn { flex: none; }

/* the path: snake layout like the artboard; label beside the circle, current node centred */
.nodes { list-style: none; margin: 0; padding: 0 0 var(--s-s); display: flex; flex-direction: column; gap: 22px; }
.nodes__item { display: flex; }
.nodes__item--l { justify-content: flex-start; padding-left: 36px; }
.nodes__item--l:nth-child(4n + 1) { padding-left: 56px; }
.nodes__item--r { justify-content: flex-end; padding-right: 26px; }
.nodes__item--r:nth-child(4n + 2) { padding-right: 46px; }
.nodes__item--c { justify-content: center; padding: var(--s-s) 0; }

.node {
  display: flex; align-items: center; gap: var(--s-m);
  max-width: 100%; padding: 0; margin: 0;
  background: none; border: 0; color: var(--ink); text-align: left;
}
.nodes__item--r .node { flex-direction: row-reverse; text-align: right; }
.nodes__item--c .node { flex-direction: column; gap: 6px; text-align: center; }
button.node { cursor: pointer; }
.node__dot {
  flex: none; display: grid; place-items: center;
  width: 58px; height: 58px; border-radius: var(--r-node);
  background: var(--surface); border: var(--bw-strong) solid var(--border); color: var(--ink);
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.node__icon { width: 26px; height: 26px; }
.node__dot { position: relative; }
.node__label {
  display: flex; flex-direction: column; min-width: 0; padding: 2px 6px; border-radius: 10px;
  background: var(--paper); /* keeps the title readable where the road passes under it */
}
.node__title { font-size: 0.9375rem; font-weight: 800; line-height: 1.25; }
.node__meta { display: inline-flex; align-items: center; gap: 4px; margin-top: 2px; font-size: var(--fs-caption); font-weight: 700; color: var(--ink-muted); }
.nodes__item--r .node__meta { justify-content: flex-end; }
.node__meta .icon { width: 14px; height: 14px; }
.node__badge {
  position: absolute; right: -6px; bottom: -6px; display: grid; place-items: center;
  width: 24px; height: 24px; border-radius: 50%; background: var(--repeat); border: var(--bw) solid var(--border); color: var(--ink);
}
.node__badge .icon { width: 13px; height: 13px; stroke-width: 2.6; }
.node--current .node__badge { right: -2px; bottom: -2px; }

.node--done .node__dot { background: var(--success-strong); color: var(--on-action); }
.node--done .node__icon { stroke-width: 3; }
.node--open .node__icon { fill: currentColor; stroke-width: 1.5; }
.node--open .node__dot { box-shadow: var(--press-card); }
button.node--open:active .node__dot { transform: translateY(3px); box-shadow: 0 1px 0 var(--border); }

.node--current .node__dot {
  width: 84px; height: 84px; background: var(--action); color: var(--on-action);
  box-shadow: 0 6px 0 var(--action-shadow);
}
.node--current .node__icon { width: 32px; height: 32px; fill: currentColor; stroke-width: 1.5; }
.node--current .node__title { font-size: var(--fs-lead); font-weight: 900; margin-top: 6px; }
button.node--current:active .node__dot { transform: translateY(4px); box-shadow: 0 2px 0 var(--action-shadow); }

.node--soon .node__dot { width: 54px; height: 54px; border: var(--bw-strong) dashed var(--locked-border); color: var(--ink-soft); }
.node--soon .node__icon { width: 22px; height: 22px; }
.node--soon .node__title { font-weight: 700; color: var(--ink-muted); }
.nodes__item--checkpoint .node__dot { border-radius: var(--r-card); }

.node__sticker { position: relative; z-index: 2; }
@media (prefers-reduced-motion: no-preference) {
  /* sticker wiggles once after the road has drawn; the current node breathes gently */
  .node--current .sticker { animation: wiggle 0.7s ease-in-out 1.1s 1 both; }
  @keyframes wiggle { 0%, 100% { transform: rotate(-3deg); } 25% { transform: rotate(4deg) scale(1.06); } 50% { transform: rotate(-7deg) scale(1.06); } 75% { transform: rotate(1deg); } }
  .node--current .node__dot::after {
    content: ""; position: absolute; inset: -3px; border-radius: inherit; border: var(--bw-strong) solid var(--action);
    animation: pulse 2.4s ease-out 1.4s infinite; opacity: 0; pointer-events: none;
  }
  @keyframes pulse { 0% { transform: scale(1); opacity: 0.9; } 70%, 100% { transform: scale(1.45); opacity: 0; } }
}

/* daily goal + repeat cards: under the header, so they never cover the path */
.daycards { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-s); margin: 0 0 var(--s-xl); }
.daycard {
  display: flex; flex-direction: column; align-items: flex-start; gap: 2px;
  min-height: var(--touch); padding: 10px 12px; margin: 0;
  border: var(--bw) solid var(--border); border-radius: var(--r-control);
  color: var(--ink); font-size: var(--fs-small); font-weight: 800; text-align: left; line-height: 1.3;
}
.daycard__title { display: inline-flex; align-items: center; gap: 6px; font-weight: 800; }
.daycard__title .icon { width: 16px; height: 16px; }
.daycard__text { display: block; font-weight: 700; color: var(--ink-muted); }
.daycard--goal { background: var(--info); }
.daycard--repeat { background: var(--repeat); }
button.daycard { cursor: pointer; box-shadow: var(--press-card); margin-bottom: 4px; transition: transform 0.1s ease, box-shadow 0.1s ease; }
button.daycard:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--border); }

/* ---------- lesson player ---------- */

.lesson { display: flex; flex-direction: column; min-height: 100vh; min-height: 100dvh; }
.lesson__top {
  position: sticky; top: 0; z-index: 3; background: var(--paper-glass);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  display: flex; align-items: center; gap: var(--s-m); padding: var(--s-m) var(--s-xl) var(--s-s) var(--s-s);
}
.progress {
  flex: 1; height: 18px; border-radius: 9px; overflow: hidden;
  border: var(--bw) solid var(--border); background: var(--surface);
}
.progress__fill {
  height: 100%; width: 100%; transform: translateX(-96%);
  background: linear-gradient(90deg, var(--success-strong), var(--progress-end));
  border-right: var(--bw) solid var(--border);
  transition: transform 0.5s cubic-bezier(0.3, 1.2, 0.5, 1);
}
.lesson__stage { flex: 1; padding: var(--s-m) var(--s-xl) var(--s-xxl); }
.lesson__bar {
  position: sticky; bottom: 0; z-index: 3;
  padding: var(--s-m) var(--s-xl) calc(var(--s-m) + env(safe-area-inset-bottom));
  background: linear-gradient(to top, var(--paper) 78%, transparent);
}
.lesson__actions { display: flex; flex-direction: column; gap: var(--s-s); }


.step__title { font-size: var(--fs-h1); line-height: 1.15; margin-bottom: var(--s-l); }
.step__kicker { font-size: var(--fs-h2); margin-bottom: var(--s-m); }
.step--summary .md {
  padding: var(--s-l); border-radius: var(--r-card);
  background: var(--surface); border: var(--bw) solid var(--border); box-shadow: var(--press-card);
}

.md { font-size: var(--fs-lead); }
.md > * + * { margin-top: 0.85rem; }
.md h3 { font-size: var(--fs-h3); }
.md ul, .md ol { padding-left: 1.3rem; }
.md li + li { margin-top: 0.3rem; }
.md li::marker { color: var(--ink-soft); }
.md em { font-style: normal; background: linear-gradient(transparent 55%, var(--highlight) 55%); padding: 0 2px; }
.md strong { font-weight: 900; }
.md code { font-size: 0.9em; background: var(--frame); padding: 0.05em 0.35em; border-radius: 6px; }
.md pre { overflow-x: auto; background: var(--frame); padding: 0.8rem; border-radius: var(--r-chip); border: var(--bw) solid var(--border); }

/* chat bubbles: the learner's prompt is "ink on paper" inverted; Claude's reply is a white card */
.bubble {
  position: relative; max-width: 92%; padding: 14px 16px;
  border: var(--bw) solid var(--border); border-radius: var(--r-card);
  font-size: 0.9375rem; line-height: var(--lh-body);
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.bubble--user { margin-left: auto; background: var(--ink); color: var(--paper); border-bottom-right-radius: 6px; }
.bubble--assistant { margin-right: auto; background: var(--surface); color: var(--ink); border-bottom-left-radius: 6px; }
.bubble__label { display: block; font-size: var(--fs-caption); font-weight: 900; color: var(--ink-muted); margin-bottom: 2px; }
.bubble--muted { background: var(--frame); color: var(--ink); border-style: dashed; border-color: var(--ink-soft); }
.bubble--suggested { margin-left: 0; max-width: 100%; }

/* ---------- exercises ---------- */

.ex__tag {
  display: inline-block; padding: 5px 12px; margin-bottom: var(--s-m);
  border: var(--bw) solid var(--border); border-radius: var(--r-chip);
  background: var(--repeat); font-size: var(--fs-caption); font-weight: 900; line-height: 1.2;
}
.ex__question { font-size: var(--fs-h2); line-height: 1.25; margin-bottom: var(--s-s); }
.ex__instruction { color: var(--ink-muted); font-size: var(--fs-small); font-weight: 700; margin-bottom: var(--s-m); }
.ex__counter { color: var(--ink-muted); font-size: var(--fs-small); margin: var(--s-s) 0; }

.options { display: flex; flex-direction: column; gap: 10px; }
.option {
  width: 100%; display: flex; align-items: center; gap: var(--s-m);
  min-height: 56px; padding: 14px 16px; text-align: left; cursor: pointer;
  background: var(--surface); color: var(--ink);
  border: var(--bw) solid var(--border); border-radius: var(--r-card);
  font-size: var(--fs-body); font-weight: 700; line-height: 1.35;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.option[aria-pressed="true"] { background: var(--highlight); box-shadow: var(--press-card); transform: translateY(-2px); }
.option:active:not(:disabled) { transform: translateY(1px); }
.option:disabled { cursor: default; color: var(--ink); transform: none; }
.option__text { flex: 1; }
.option__mark { flex: none; }
.option__dot, .option__box { display: block; width: 22px; height: 22px; border: var(--bw) solid var(--border); background: var(--surface); }
.option__dot { border-radius: 50%; }
.option__box { border-radius: 6px; }
.option[aria-pressed="true"] .option__dot { border-width: 7px; }
.option[aria-pressed="true"] .option__box { background: var(--ink); box-shadow: inset 0 0 0 3px var(--surface); }

/* checked states: the radio mark gives way to a round badge on the left (check or cross) */
.option__state {
  order: -1; flex: none; display: grid; place-items: center;
  width: 28px; height: 28px; border-radius: 50%; background: var(--ink); color: var(--success);
}
.option__state .icon { width: 16px; height: 16px; stroke-width: 3.4; }
.option--ok .option__mark, .option--bad .option__mark, .option--missed .option__mark { display: none; }
.option.option--ok {
  background: var(--success); border-width: var(--bw-strong); padding: 13px 15px;
  box-shadow: var(--press-card); font-weight: 800; transform: none;
}
.option.option--missed { background: var(--success); border-style: dashed; box-shadow: none; transform: none; }
.option.option--bad { background: var(--wrong); box-shadow: none; transform: none; }
.option.option--bad .option__state { background: var(--surface); color: var(--ink); border: var(--bw) solid var(--border); }
.option.option--dim { color: var(--ink-muted); border-color: var(--border-soft); box-shadow: none; transform: none; }
.option--chip { min-height: var(--touch); }
.option-wrap + .option-wrap { margin-top: 0; }

.why { padding: 6px 8px 4px 18px; font-size: 0.9375rem; font-weight: 600; line-height: 1.5; color: var(--ink); }
.why__lead { font-weight: 900; }
.why--info { color: var(--ink-muted); }

.hint { margin-top: var(--s-l); }
.hint__btn { min-height: var(--touch); font-size: var(--fs-small); border-radius: var(--r-control); }
.hint__text {
  margin-top: var(--s-s); padding: var(--s-m) 14px; border-radius: var(--r-control);
  background: var(--highlight); border: var(--bw) solid var(--border);
}

.feedback:empty { display: none; }
.feedback {
  display: flex; align-items: center; gap: var(--s-m); margin-top: var(--s-l);
  padding: var(--s-m) 14px; border-radius: var(--r-control);
  border: var(--bw) solid var(--border); font-weight: 800; color: var(--ink);
}
.feedback--ok { background: var(--success); }
@media (prefers-reduced-motion: no-preference) {
  .option[aria-pressed="true"], .pair--active, .seg[aria-pressed="true"], .gap--active { animation: bounce 0.32s cubic-bezier(0.3, 1.6, 0.5, 1); }
  @keyframes bounce { 0% { scale: 1; } 40% { scale: 1.035; } 100% { scale: 1; } }
  .feedback--ok, .feedback--bad { animation: feedback-in 0.28s cubic-bezier(0.2, 1.3, 0.4, 1); }
  @keyframes feedback-in { from { opacity: 0; transform: translateY(8px) scale(0.97); } }
  .feedback--ok .feedback__icon, .ex.is-correct .option__state, .ex.is-correct .seg-note .icon { animation: check-pop 0.45s cubic-bezier(0.2, 1.8, 0.4, 1) 0.05s both; }
  @keyframes check-pop { 0% { transform: scale(0) rotate(-30deg); } 100% { transform: none; } }
  .ex.is-correct .option--ok, .ex.is-correct .pair--ok, .ex.is-correct .ostep--ok, .ex.is-correct .gap--ok, .ex.is-correct .seg--ok, .ex.is-correct .chip--placed { animation: flash 0.7s ease-out; }
  @keyframes flash { 0% { box-shadow: 0 0 0 0 var(--success-strong); } 40% { box-shadow: 0 0 0 7px var(--success-strong); } 100% { box-shadow: 0 0 0 14px transparent; } }
}
.feedback--bad { background: var(--wrong); }
.feedback__icon { width: 28px; height: 28px; padding: 5px; border-radius: 50%; background: var(--ink); color: var(--paper); stroke-width: 3.4; }

/* compare_answers */
.cards { display: grid; gap: var(--s-m); margin-bottom: var(--s-l); }
.card {
  padding: var(--s-m); border-radius: var(--r-card); background: var(--frame);
  border: var(--bw) solid var(--border); display: flex; flex-direction: column; gap: 10px;
}
.card__label { font-size: var(--fs-small); font-weight: 900; color: var(--ink); }
.card__id {
  display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem; border-radius: 50%;
  background: var(--ink); color: var(--paper); font-size: 0.8rem; margin-right: 0.25rem;
}

/* find_error (segments live inside the ink user bubble) */
.bubble--segments { max-width: 100%; margin: 0 0 var(--s-xs); white-space: normal; font-size: var(--fs-body); }
.seg {
  display: inline; padding: 0.2em 0.15em; margin: 0; border: 0; cursor: pointer;
  background: transparent; color: inherit; line-height: 2.1; font-weight: 700;
  border-radius: 6px; text-decoration: underline dotted 2px; text-underline-offset: 0.3em;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
.seg[aria-pressed="true"], .seg.seg--ok { background: var(--action); color: var(--on-action); text-decoration: none; }
.seg:disabled { cursor: default; }
.seg.seg--bad { background: var(--wrong); color: var(--ink); text-decoration: line-through 2px; }
.seg.seg--missed { outline: 2px dashed var(--action); outline-offset: 1px; text-decoration: none; }
.seg.seg--neutral { text-decoration: none; }
.seg:focus-visible { outline-color: var(--action); }

.seg-notes, .match-notes, .build-notes, .gap-notes { list-style: none; padding: 0; margin: var(--s-m) 0 0; display: flex; flex-direction: column; gap: 10px; }
.seg-note, .match-note, .build-note, .gap-note {
  padding: var(--s-m) 14px; border-radius: var(--r-control);
  background: var(--surface); border: var(--bw) solid var(--border);
}
.seg-note--ok, .seg-note--missed, .match-note--ok, .build-note--ok, .gap-note--ok { background: var(--success); }
.seg-note--bad, .match-note--bad, .build-note--bad, .gap-note--bad { background: var(--wrong); }
.seg-note__quote, .match-note__pair, .build-note__head, .gap-note__head { display: flex; gap: 0.5rem; align-items: flex-start; font-weight: 800; }
.seg-note .icon, .match-note .icon, .build-note .icon, .gap-note .icon { margin-top: 0.1em; stroke-width: 3; }
.seg-notes .why, .match-notes .why, .build-notes .why, .gap-notes .why { padding-left: 0; padding-bottom: 0; }
.build-note__status { font-size: var(--fs-small); color: var(--ink-muted); margin-top: 2px; }

/* match_pairs */
.match { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.match__col { display: flex; flex-direction: column; gap: 10px; }
.pair {
  display: flex; align-items: flex-start; gap: 6px; text-align: left;
  min-height: 56px; height: 100%; padding: 10px; cursor: pointer;
  background: var(--surface); color: var(--ink); border: var(--bw) solid var(--border); border-radius: var(--r-control);
  font-size: var(--fs-small); font-weight: 700; line-height: 1.35;
}
.pair__tag {
  flex: none; display: inline-grid; place-items: center; min-width: 1.5rem; height: 1.5rem;
  border-radius: 50%; font-weight: 900; font-size: 0.8rem; background: var(--frame);
}
.pair__tag:empty { background: transparent; border: var(--bw) dashed var(--ink-soft); }
.pair--active { background: var(--highlight); box-shadow: var(--press-card); }
.pair--linked .pair__tag { background: var(--ink); color: var(--paper); border: 0; }
.pair--ok { background: var(--success); }
.pair--bad { background: var(--wrong); border-style: dashed; }
.pair:disabled { cursor: default; color: var(--ink); }
.match-note__arrow { color: var(--ink-muted); }

/* order_steps */
.steps { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; }
.ostep {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 10px;
  padding: 6px 6px 6px 12px; border-radius: var(--r-control);
  background: var(--surface); border: var(--bw) solid var(--border); font-weight: 700;
}
.ostep > .why { grid-column: 1 / -1; padding-left: 0; }
.ostep__num {
  display: inline-grid; place-items: center; width: 1.8rem; height: 1.8rem; border-radius: 50%;
  background: var(--ink); color: var(--paper); font-weight: 900; font-variant-numeric: tabular-nums;
}
.ostep__ctrl { display: flex; }
.ostep__state { display: inline-flex; padding: 0 10px; }
.ostep__state .icon { stroke-width: 3; }
.ostep--ok { background: var(--success); }
.ostep--bad { background: var(--wrong); border-style: dashed; }
.solution {
  margin-top: var(--s-l); padding: 14px 16px; border-radius: var(--r-control);
  background: var(--success); border: var(--bw) solid var(--border); list-style: none;
}
.solution__title { font-size: var(--fs-body); margin-bottom: 6px; }
.solution__list { margin: 0; padding-left: 1.3rem; }

/* build_prompt (chips are assembled inside the ink user bubble) */
.bubble--build { max-width: 100%; min-height: 4.5rem; margin-bottom: var(--s-l); white-space: normal; }
.assembled { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.assembled__empty { color: var(--paper); font-weight: 700; }
.pool { display: flex; flex-wrap: wrap; gap: var(--s-s); }
.chip {
  display: inline-flex; align-items: center; gap: 6px; text-align: left;
  min-height: var(--touch); padding: 8px 14px; cursor: pointer;
  border-radius: var(--r-control); border: var(--bw) solid var(--border); background: var(--surface); color: var(--ink);
  font-weight: 700; line-height: 1.35; box-shadow: 0 3px 0 var(--border); margin-bottom: 3px;
}
.chip:active:not(:disabled) { transform: translateY(2px); box-shadow: 0 1px 0 var(--border); }
.chip:disabled { cursor: default; }
.chip--placed {
  background: color-mix(in srgb, var(--paper) 14%, transparent);
  border-color: color-mix(in srgb, var(--paper) 60%, transparent);
  color: var(--paper); box-shadow: none; margin-bottom: 0;
}
.chip--placed:focus-visible { outline-color: var(--action); }
.chip__num { font-weight: 900; }
.tag {
  margin-left: auto; font-size: 0.75rem; font-weight: 900; padding: 1px 8px;
  border-radius: var(--r-chip); background: var(--repeat); border: 1.5px solid var(--border); color: var(--ink); white-space: nowrap;
}

/* fill_gap */
.gap-text {
  font-size: var(--fs-h3); line-height: 2.2; margin-bottom: var(--s-l); padding: var(--s-l);
  border-radius: var(--r-card); background: var(--surface); border: var(--bw) solid var(--border);
}
.gap {
  min-width: 4.5rem; min-height: var(--touch); padding: 0.1rem 0.6rem; margin: 0 0.15rem;
  border: 0; border-bottom: var(--bw-strong) solid var(--border); border-radius: 10px 10px 0 0;
  background: var(--frame); color: var(--ink); cursor: pointer; font-weight: 800;
}
.gap--active { background: var(--highlight); }
.gap--ok { background: var(--success); }
.gap--bad { background: var(--wrong); text-decoration: line-through 2px; }
.options--compact { flex-direction: row; flex-wrap: wrap; margin-bottom: var(--s-s); }
.options--compact .option { width: auto; min-height: var(--touch); padding: 10px 14px; border-radius: var(--r-control); }

/* ---------- AI practice ---------- */

.editor { display: flex; flex-direction: column; gap: 10px; }
.weak__title, .ideas__title { font-size: var(--fs-small); color: var(--ink-muted); font-weight: 800; margin-bottom: 6px; }
.weak .bubble { margin-left: 0; }
.prompt-label { font-weight: 900; font-size: var(--fs-lead); margin-top: var(--s-xs); }
.ideas__list { display: flex; gap: var(--s-s); overflow-x: auto; padding: 2px 2px 6px; scrollbar-width: thin; }
.chip--idea { flex: none; font-size: var(--fs-small); background: var(--highlight); white-space: nowrap; }
.prompt-input {
  width: 100%; min-height: 9.5rem; resize: vertical; padding: 14px 16px;
  border: var(--bw) solid var(--border); border-radius: var(--r-control);
  background: var(--surface); color: var(--ink); line-height: 1.5; font-weight: 600;
}
.prompt-input::placeholder { color: var(--ink-soft); opacity: 1; }
.prompt-input:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 3px; }
.prompt-input[readonly] { background: var(--frame); color: var(--ink-muted); }
.counter { font-size: var(--fs-small); color: var(--ink-muted); text-align: right; font-variant-numeric: tabular-nums; }
.counter--ok { color: var(--ink); font-weight: 800; }
.privacy-note { display: flex; gap: var(--s-s); align-items: flex-start; font-size: var(--fs-small); color: var(--ink-muted); }

.review { display: flex; flex-direction: column; gap: 14px; margin-top: var(--s-l); }
.review:empty { display: none; }
.review__title { font-size: 0.9375rem; font-weight: 900; margin-bottom: 6px; }
.loading { display: flex; flex-direction: column; align-items: center; gap: var(--s-m); padding: 2rem 1rem; text-align: center; color: var(--ink-muted); }
.loading__dots {
  display: inline-flex; gap: 6px; padding: 14px 18px; border-radius: var(--r-card) var(--r-card) var(--r-card) 6px;
  background: var(--surface); border: var(--bw) solid var(--border);
}
.loading__dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--ink); }
@media (prefers-reduced-motion: no-preference) {
  .loading__dots i { animation: blink 1.2s infinite ease-in-out; }
  .loading__dots i:nth-child(2) { animation-delay: 0.15s; }
  .loading__dots i:nth-child(3) { animation-delay: 0.3s; }
  @keyframes blink { 0%, 80%, 100% { opacity: 0.25; } 40% { opacity: 1; } }
}

.alert {
  padding: 14px 16px; border-radius: var(--r-card); display: flex; flex-direction: column; gap: 6px;
  border: var(--bw) solid var(--border); color: var(--ink);
}
.alert__title { display: flex; gap: var(--s-s); align-items: center; font-size: var(--fs-lead); font-weight: 900; }
.alert__title .icon { width: 24px; height: 24px; stroke-width: 2.6; }
.alert__small { font-size: var(--fs-small); font-weight: 800; }
.alert--danger { background: var(--wrong); border-width: var(--bw-strong); box-shadow: var(--press-card); margin-bottom: 4px; }
.alert--info { background: var(--info); }
.alert--warn { background: var(--highlight); }

/* review hero: score circle + verdict; confetti only when the task is passed */
.verdict {
  position: relative; overflow: hidden;
  display: flex; align-items: center; gap: 14px; padding: 18px;
  border: var(--bw-strong) solid var(--border); border-radius: var(--r-hero);
  background: var(--highlight); color: var(--ink);
}
.verdict--off_task { background: var(--wrong); }
.verdict--draft, .verdict.is-not-passed { background: var(--surface); }
.verdict--off_task.is-not-passed { background: var(--wrong); }
.verdict__score {
  position: relative; flex: none; display: grid; place-items: center;
  width: 70px; height: 70px; border-radius: 50%;
  border: var(--bw-strong) solid var(--border); background: var(--surface);
  font-size: var(--fs-score); font-weight: 900; font-variant-numeric: tabular-nums;
}
.verdict__body { position: relative; min-width: 0; padding-right: 14px; }
.verdict__title { font-size: 1.375rem; }
.verdict__text { font-size: 0.9375rem; font-weight: 700; margin-top: 2px; }
.verdict:not(.is-passed) .verdict__text { color: var(--ink-muted); }

.review-card {
  display: flex; flex-direction: column; gap: var(--s-m); padding: 14px 16px;
  border: var(--bw) solid var(--border); border-radius: var(--r-card); background: var(--surface);
}
.review-list ul { margin: 0; padding-left: 1.2rem; display: flex; flex-direction: column; gap: var(--s-xs); font-size: 0.9375rem; }
.review-list li::marker { color: var(--ink-soft); }

.criteria__list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--s-s); }
.crit {
  padding: 7px 12px; border-radius: 14px; border: var(--bw) solid var(--border);
  background: var(--surface); font-size: var(--fs-small);
}
.crit:has(.crit__comment) { flex-basis: 100%; }
.crit__head { display: flex; align-items: center; gap: 6px; font-weight: 800; }
.crit__stars { letter-spacing: 1px; }
.crit--good { background: var(--success); }
.crit--partial { background: var(--improve); }
.crit--missing { border-style: dashed; }
.crit__comment { font-size: var(--fs-small); font-weight: 600; color: var(--ink-muted); margin-top: 2px; }

.copy summary, .mine summary, .sources summary, .about summary {
  cursor: pointer; font-weight: 900; min-height: var(--touch); padding: 0.6rem 0; display: list-item;
}
.copy__body { display: flex; flex-direction: column; gap: var(--s-s); }
.copy__actions { display: flex; align-items: center; gap: var(--s-m); }
.copy__status { font-size: var(--fs-small); font-weight: 800; color: var(--ink); }
.remaining { font-size: var(--fs-small); color: var(--ink-muted); }

.selfcheck__lead { font-size: var(--fs-small); color: var(--ink-muted); margin-bottom: var(--s-s); }
.selfcheck__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--s-s); }
.selfcheck__item {
  display: flex; gap: var(--s-m); align-items: flex-start; padding: 10px 12px;
  border-radius: var(--r-control); background: var(--surface); border: var(--bw) solid var(--border);
}
.selfcheck__item input { flex: none; width: 24px; height: 24px; margin: 0; accent-color: var(--ink); }
.selfcheck__item label { flex: 1; cursor: pointer; min-height: 24px; }
.selfcheck__item:has(input:checked) { background: var(--success); }

/* ---------- completion ---------- */

.complete { display: flex; flex-direction: column; align-items: center; text-align: center; gap: var(--s-l); padding: var(--s-xxl) 0 var(--s-l); }
.complete__hero {
  position: relative; overflow: hidden; width: 100%;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  padding: 28px 18px 24px; border: var(--bw-strong) solid var(--border); border-radius: var(--r-hero);
  background: var(--highlight);
}
.complete__hero > :not(.confetti) { position: relative; }
.complete__mark {
  display: grid; place-items: center; width: 84px; height: 84px; border-radius: 50%;
  background: var(--success-strong); color: var(--on-action);
  border: var(--bw-strong) solid var(--border); box-shadow: var(--press-card);
}
.complete__icon { width: 44px; height: 44px; stroke-width: 3.2; }
@media (prefers-reduced-motion: no-preference) {
  .complete__mark { animation: pop 0.5s cubic-bezier(0.2, 1.4, 0.4, 1) both; }
  @keyframes pop { from { transform: scale(0.4) rotate(-20deg); opacity: 0; } }
}
.complete__title { font-size: var(--fs-h1); line-height: 1.15; }
.complete__lesson { font-weight: 700; color: var(--ink-muted); }
.xp-chip {
  display: inline-flex; align-items: center; height: 40px; padding: 0 16px; margin-top: var(--s-xs);
  border: var(--bw) solid var(--border); border-radius: 20px; background: var(--surface);
  font-size: var(--fs-h3); font-weight: 900; font-variant-numeric: tabular-nums;
}
.complete__stats { display: flex; gap: var(--s-m); justify-content: center; width: 100%; }
.big-stat {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap;
  padding: var(--s-m) var(--s-l); border-radius: var(--r-card); background: var(--surface); border: var(--bw) solid var(--border);
}
.big-stat__value { display: inline-flex; align-items: center; gap: 6px; font-size: var(--fs-h2); font-weight: 900; font-variant-numeric: tabular-nums; }
.big-stat__label { font-size: var(--fs-small); font-weight: 700; color: var(--ink-muted); }
.big-stat--streak { background: var(--streak); }
.big-stat--streak .icon { width: 22px; height: 22px; }
.big-stat--streak.is-up .icon { fill: var(--brand-dot); transform-origin: 50% 90%; }
@media (prefers-reduced-motion: no-preference) {
  .big-stat--streak.is-up .icon { animation: flicker 1.6s ease-in-out 0.6s 3; }
  @keyframes flicker { 0%, 100% { transform: scale(1) rotate(0); } 20% { transform: scale(1.12, 0.94) rotate(-4deg); } 45% { transform: scale(0.95, 1.1) rotate(3deg); } 70% { transform: scale(1.08, 0.97) rotate(-2deg); } }
  .xp-chip { animation: pop 0.5s cubic-bezier(0.2, 1.4, 0.4, 1) 0.15s both; }
}
.xp-chip__num { display: inline-block; min-width: 1.2ch; text-align: right; }
.xp-rows {
  display: grid; grid-template-columns: 1fr auto; gap: 6px 1.5rem; margin: 0; width: 100%; text-align: left;
  padding: 14px 16px; border-radius: var(--r-card); background: var(--surface); border: var(--bw) solid var(--border);
}
.xp-rows dd { margin: 0; font-weight: 900; font-variant-numeric: tabular-nums; text-align: right; }
.complete__note { display: inline-flex; gap: 6px; align-items: center; color: var(--ink-muted); font-size: var(--fs-small); }
.sources {
  width: 100%; text-align: left; padding: 2px 16px 12px; border-radius: var(--r-card);
  background: var(--surface); border: var(--bw) solid var(--border);
}
.sources__date { font-size: var(--fs-small); color: var(--ink-muted); margin-bottom: var(--s-s); }
.sources .md { font-size: var(--fs-small); }
.complete__actions { padding: var(--s-s) 0 var(--s-l); }

.loading-screen { display: grid; place-items: center; min-height: 60vh; color: var(--ink-muted); }

/* ---------- confetti burst (motion.js) ---------- */

.burst { position: fixed; z-index: 60; width: 0; height: 0; pointer-events: none; }
.burst i { position: absolute; left: 0; top: 0; width: 9px; height: 9px; border-radius: 2px; border: 1.5px solid var(--border); will-change: transform, opacity; }

/* ---------- account screens ---------- */

.topbar--auth { gap: var(--s-s); }
.topbar--auth .icon-btn { margin-left: -10px; }
.auth { display: flex; flex-direction: column; gap: var(--s-l); padding: var(--s-s) 0 var(--s-l); }
.auth__art {
  display: grid; place-items: center; width: 72px; height: 72px; border-radius: 50%;
  background: var(--highlight); border: var(--bw-strong) solid var(--border); box-shadow: var(--press-card); transform: rotate(-4deg);
}
.auth__art.is-ok { background: var(--success-strong); }
.auth__art-icon { width: 34px; height: 34px; stroke-width: 2.4; }
.auth__title { font-size: var(--fs-h1); line-height: 1.15; }
.auth__lead { font-size: var(--fs-lead); color: var(--ink-muted); }
.auth__email { color: var(--ink); font-weight: 900; overflow-wrap: anywhere; }
.auth__steps { margin: 0; padding: 14px 16px 14px 2.2rem; border: var(--bw) solid var(--border); border-radius: var(--r-card); background: var(--surface); display: flex; flex-direction: column; gap: 6px; }
.auth__steps li::marker { font-weight: 900; }
.auth__result { display: flex; flex-direction: column; gap: var(--s-l); }
.auth__below { display: flex; flex-direction: column; align-items: center; gap: var(--s-xs); text-align: center; margin-top: var(--s-xs); }
.auth__switch { color: var(--ink-muted); }
.auth__link { display: inline-flex; align-items: center; min-height: var(--touch); font-weight: 900; color: var(--ink); }
@media (prefers-reduced-motion: no-preference) {
  .auth__art { animation: pop 0.5s cubic-bezier(0.2, 1.4, 0.4, 1) both; }
}

.form { display: flex; flex-direction: column; gap: var(--s-l); }
.form__status:empty { display: none; }
.form .btn--primary { margin-top: var(--s-xs); }
.field { display: flex; flex-direction: column; gap: 6px; }
.field__label { font-weight: 900; }
.field__control { position: relative; }
.field__input {
  width: 100%; min-height: 54px; padding: 12px 16px;
  border: var(--bw) solid var(--border); border-radius: var(--r-control); background: var(--surface); color: var(--ink);
  font-size: var(--fs-body); font-weight: 700;
}
.field__input[type="password"], .field__control:has(.field__toggle) .field__input { padding-right: 56px; }
.field__input:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.field--error .field__input { background: var(--wrong); border-width: var(--bw-strong); padding: 11px 15px; }
.field--error .field__control:has(.field__toggle) .field__input { padding-right: 55px; }
.field__toggle {
  position: absolute; right: 5px; top: 50%; translate: 0 -50%;
  display: grid; place-items: center; width: var(--touch); height: var(--touch);
  border: 0; border-radius: var(--r-chip); background: none; color: var(--ink); cursor: pointer;
}
.field__toggle:hover { background: var(--frame); }
.field__hint { display: flex; align-items: center; gap: 6px; font-size: var(--fs-small); color: var(--ink-muted); font-weight: 700; }
.field__hint.is-ok { color: var(--ink); }
.field--error .field__hint { display: none; } /* the error already says what is needed */
.field__hint-icon { width: 16px; height: 16px; }
.field__hint.is-ok .field__hint-icon { color: var(--ink); background: var(--success-strong); border-radius: 50%; padding: 2px; stroke-width: 3.4; }
.field__error { display: flex; align-items: flex-start; gap: 6px; font-size: var(--fs-small); font-weight: 800; color: var(--ink); }
.field__error-icon { width: 18px; height: 18px; flex: none; padding: 3px; border-radius: 50%; background: var(--ink); color: var(--wrong); stroke-width: 3.4; margin-top: 1px; }
.consent { font-size: var(--fs-small); color: var(--ink-muted); }
.consent > p { display: flex; gap: var(--s-s); align-items: flex-start; }
.consent > p .icon { margin-top: 2px; }
.consent__link {
  display: inline; min-height: 0; padding: 0; border: 0; background: none; color: var(--ink); cursor: pointer;
  font-weight: 900; text-decoration: underline 2px; text-underline-offset: 0.2em;
  /* invisible padding gives a 44px target without moving the text */
  position: relative;
}
.consent__link::after { content: ""; position: absolute; inset: -12px -6px; }
.consent__text { margin-top: var(--s-s); padding: var(--s-m) 14px; border-radius: var(--r-control); background: var(--info); color: var(--ink); border: var(--bw) solid var(--border); }
.alert .btn { align-self: flex-start; margin-top: var(--s-xs); }

/* ---------- bottom sheet ---------- */

.sheet {
  position: fixed; inset: auto 0 0 0; width: 100%; max-width: var(--col); max-height: 92dvh;
  margin: 0 auto; padding: 0; border: 0; background: transparent; color: var(--ink); overflow: visible;
}
.sheet::backdrop { background: rgb(34 34 59 / 0.5); }
.sheet__panel {
  position: relative; display: flex; flex-direction: column; gap: var(--s-l);
  max-height: 92dvh; overflow-y: auto;
  padding: 14px var(--s-xl) calc(var(--s-xl) + env(safe-area-inset-bottom));
  background: var(--paper-pattern); border: var(--bw-strong) solid var(--border); border-bottom: 0;
  border-radius: var(--r-hero) var(--r-hero) 0 0;
}
.sheet__grip { align-self: center; width: 44px; height: 5px; border-radius: 3px; background: var(--border-soft); }
.sheet__close { position: absolute; top: 8px; right: 8px; }
.sheet__title { font-size: var(--fs-h2); line-height: 1.2; padding-right: 40px; }
.sheet__kicker { font-weight: 800; color: var(--ink-muted); margin-top: calc(-1 * var(--s-s)); }
.sheet__actions { display: flex; flex-direction: column; gap: var(--s-s); }
.sheet__note { display: flex; gap: var(--s-s); align-items: flex-start; justify-content: center; font-size: var(--fs-small); color: var(--ink-muted); text-align: center; }
.sheet__note .icon { flex: none; margin-top: 1px; }
.sheet__note:has(.icon) { justify-content: flex-start; text-align: left; }
.perks { list-style: none; margin: 0; padding: 14px 16px; display: flex; flex-direction: column; gap: 10px; border: var(--bw) solid var(--border); border-radius: var(--r-card); background: var(--surface); }
.perks li { display: flex; gap: 10px; align-items: flex-start; font-weight: 800; }
.perks .icon { flex: none; width: 22px; height: 22px; padding: 3px; border-radius: 50%; background: var(--success-strong); border: var(--bw) solid var(--border); stroke-width: 3.4; }
.account { display: flex; align-items: center; gap: var(--s-l); padding: 14px 16px; border: var(--bw) solid var(--border); border-radius: var(--r-card); background: var(--surface); }
.account__info { min-width: 0; }
.account__label { font-size: var(--fs-small); color: var(--ink-muted); }
.account__email { font-weight: 900; overflow-wrap: anywhere; }

@media (min-width: 600px) {
  .screen { padding: 0 1.5rem; }
  .cards[data-count="2"] { grid-template-columns: 1fr 1fr; }
  .lesson__actions { flex-direction: row-reverse; align-items: flex-start; }
  .lesson__actions .btn { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; animation-delay: 0s !important; }
  .burst { display: none; }
}

@media (forced-colors: active) {
  .road__done, .road__done-edge { stroke: CanvasText; }
  .road__todo { stroke: GrayText; }
  .option[aria-pressed="true"], .seg[aria-pressed="true"], .pair--active { outline: 3px solid Highlight; }
  .hl, .md em { background: none; text-decoration: underline; }
}