.site-main--trainer {
  --cell-digit-font-size: calc(
    (2 * var(--font-size-scale, 0) * var(--isf) * 1px + var(--cell-size) * 9 / 13.5) * 1.08 * 0.9
  );
  --cell-digit-font-weight: 300;
  --cell-note-font-size: calc(var(--cell-size) * 0.2299);
  --chain-arrow-color-0: var(--user-color);
  --chain-arrow-color-1: var(--little-orange-2);
  --chain-arrow-color-2: var(--green-color);
  --chain-arrow-weak-color: var(--grid-icons-color);
  --chain-arrow-width: 2.5px;
  --chain-arrow-dash: 5 4;
  --chain-root-border-color: var(--title-color);
  --chain-root-border-width: 2.5px;
  --chain-note-on-bg: var(--green-color);
  --chain-note-off-bg: var(--little-orange-1);
}

[data-orientation='portrait'] .site-main--trainer {
  --cell-digit-font-weight: 400;
  --cell-note-font-size: calc(var(--cell-size) * 0.2299 * 1.5 * 0.9);
}

[data-orientation='landscape'] .site-main--trainer {
  --cell-note-font-size: calc(var(--cell-size) * 0.2299 * 1.1);
}

.site-main--trainer {
  display: block;
  align-items: initial;
  justify-content: initial;
  padding: 0;
}

.trainer-shell {
  max-width: var(--article-container);
  margin: 0 auto;
  padding: 0 20px 48px;
}

.trainer-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: end;
  padding: 8px 0 34px;
}

.trainer-eyebrow {
  margin: 0 0 calc(12px * var(--trainer-scale, 1));
  color: var(--accent);
  font-size: calc(13px * var(--trainer-scale, 1));
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
}
.trainer-coach__eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.trainer-hero h1 {
  max-width: 820px;
  margin: 0 0 20px;
  color: var(--text);
  font-size: var(--article-h1-size);
  font-weight: var(--article-h1-weight);
  line-height: var(--article-h1-line);
  letter-spacing: var(--article-h1-spacing);
}

.trainer-hero__lead {
  max-width: 880px;
  margin: 0;
  color: var(--article-body-color);
  font-size: var(--article-lead-size);
  line-height: var(--article-lead-line);
}

.trainer-session {
  display: flex;
  gap: 8px;
  padding-bottom: 7px;
}

.trainer-session div {
  min-width: 92px;
  padding: 14px 16px 13px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--tone-minus-one, #fff) 68%, var(--panel));
  text-align: center;
}

.trainer-session strong,
.trainer-session span { display: block; }
.trainer-session strong { color: var(--text); font-size: 25px; line-height: 1; }
.trainer-session span { margin-top: 5px; color: var(--article-body-color); font-size: 12px; }

.trainer-picker {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(210px, .9fr) minmax(250px, 1.1fr) auto;
  gap: 12px;
  align-items: end;
  margin-bottom: 18px;
  padding: 16px;
  border: 1px solid color-mix(in srgb, var(--border) 84%, transparent);
  border-radius: 18px;
  background: color-mix(in srgb, var(--tone-minus-one, #fff) 76%, var(--panel));
  box-shadow: 0 16px 40px color-mix(in srgb, var(--puzzle-color) 7%, transparent);
}

.trainer-field label {
  display: block;
  margin: 0 0 7px 3px;
  color: var(--article-body-color);
  font-size: 12px;
  font-weight: 600;
}

.trainer-select-wrap { position: relative; }
.trainer-select-wrap select {
  width: 100%;
  height: 48px;
  padding: 0 42px 0 14px;
  appearance: none;
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  background: var(--tone-minus-one, #fff);
  color: var(--text);
  font: 500 15px/1 "Outfit", sans-serif;
  cursor: pointer;
  transition: border-color 140ms ease, box-shadow 140ms ease;
}

.trainer-select-wrap select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}

.trainer-select-wrap svg {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 20px;
  height: 20px;
  fill: none;
  stroke: var(--article-body-color);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  pointer-events: none;
}

.trainer-button {
  min-height: 46px;
  padding: 0 18px;
  border: 0;
  border-radius: 12px;
  font: 600 14px/1 "Outfit", sans-serif;
  cursor: pointer;
  transition: transform 120ms ease, opacity 120ms ease, background 120ms ease;
}

.trainer-button:not(:disabled):active { transform: translateY(1px); }
.trainer-button:disabled { cursor: default; opacity: .44; }
.trainer-button--primary { background: var(--accent); color: #fff; }
.trainer-button--primary:not(:disabled):hover { background: color-mix(in srgb, var(--accent) 86%, #000); }
.trainer-button--quiet { background: var(--panel); color: var(--text); }
.trainer-button--quiet:not(:disabled):hover { background: var(--border); }

/* Кнопки внутри карточки доски масштабируются с --trainer-scale. */
.trainer-board-actions .trainer-button {
  min-height: calc(46px * var(--trainer-scale, 1));
  padding: 0 calc(18px * var(--trainer-scale, 1));
  border-radius: calc(12px * var(--trainer-scale, 1));
  font: 600 calc(14px * var(--trainer-scale, 1))/1 "Outfit", sans-serif;
}

.trainer-generate {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  height: 48px;
  white-space: nowrap;
}

.trainer-generate svg,
.trainer-guide-link svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.trainer-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 18px;
  align-items: start;
}

.trainer-board-card,
.trainer-coach {
  border: 1px solid color-mix(in srgb, var(--border) 84%, transparent);
  border-radius: 22px;
  background: color-mix(in srgb, var(--tone-minus-one, #fff) 86%, var(--panel));
  box-shadow: 0 18px 55px color-mix(in srgb, var(--puzzle-color) 8%, transparent);
}

.trainer-board-card { padding: calc(22px * var(--trainer-scale, 1)); }
.trainer-board-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: calc(16px * var(--trainer-scale, 1));
  min-height: calc(48px * var(--trainer-scale, 1));
  margin-bottom: calc(18px * var(--trainer-scale, 1));
}

.trainer-board-head > div {
  min-width: 0;
  flex: 1;
}

.trainer-board-head h2 {
  margin: 0;
  font-size: calc(34px * var(--trainer-scale, 1));
  font-weight: 600;
  letter-spacing: -.025em;
}

.trainer-seed {
  padding: calc(7px * var(--trainer-scale, 1)) calc(10px * var(--trainer-scale, 1));
  border-radius: 999px;
  background: var(--panel);
  color: var(--article-body-color);
  font-size: calc(11px * var(--trainer-scale, 1));
  font-variant-numeric: tabular-nums;
}

.trainer-grid-wrap {
  position: relative;
  /* --grid-size выставляется early-layout.js / sudoku-trainer-page.js по формуле
     главной страницы (min(w*0.96, h*0.75) для portrait) — учитывает и высоту окна,
     иначе квадрат 650×650 переполняет по вертикали при уменьшении окна.
     min() дополнительно ограничивает шириной колонки и дизайн-капом 650px. */
  width: min(var(--grid-size, 550px), 100%, 550px);
  margin: 0 auto;
  aspect-ratio: 1;
}

.trainer-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  width: 100%;
  height: 100%;
  overflow: hidden;
  border: calc(2px * var(--trainer-scale, 1)) solid var(--grid-color, #404851);
  border-radius: calc(10px * var(--trainer-scale, 1));
  background: var(--grid-color, #404851);
  box-shadow: 0 8px 22px color-mix(in srgb, var(--puzzle-color) 13%, transparent);
}

.trainer-board-card.is-explaining .trainer-grid {
  pointer-events: none;
}

.trainer-explanation-grid.sudoku-grid {
  position: absolute;
  inset: 0;
  z-index: 3;
  width: 100%;
  height: 100%;
  background: transparent;
  overflow: visible;
  pointer-events: none;
}

.trainer-explanation-grid[hidden] {
  display: none !important;
}

.trainer-explanation-grid .sudoku-grid__canvas {
  visibility: hidden;
  z-index: 1;
}

.trainer-explanation-grid .sudoku-grid__chain-arrows {
  position: absolute;
  inset: 0;
  z-index: 5;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.trainer-explanation-grid .sudoku-grid__chain-arrow {
  filter: drop-shadow(0 0 1px var(--tone-11, #f5f7fb));
}

.trainer-explanation-grid .sudoku-grid__aria {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  pointer-events: none;
}

.trainer-cell {
  position: relative;
  min-width: 0;
  min-height: 0;
  border: 0;
  border-right: 1px solid var(--grid-line-thin-color, #adb4bd);
  border-bottom: 1px solid var(--grid-line-thin-color, #adb4bd);
  background: var(--tone-11, #f5f7fb);
}

.trainer-cell.is-hint-block-area::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: color-mix(in srgb, var(--notes-delete-color, #f08088) 14%, transparent);
  pointer-events: none;
}

.trainer-cell.is-chain-root {
  box-shadow: inset 0 0 0 var(--chain-root-border-width, 2.5px)
    var(--chain-root-border-color, var(--title-color, #01579b));
}

.trainer-cell__hint-digit {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: grid;
  place-items: center;
  font-size: calc(var(--grid-size, 550px) / 13.5);
  font-weight: 500;
  pointer-events: none;
}

.trainer-cell__hint-digit.is-blinking { animation: trainer-hint-pulse 1s ease-in-out infinite; }
@keyframes trainer-hint-pulse { 50% { opacity: .35; } }

.trainer-candidate.is-hint-delete {
  position: relative;
  color: var(--wrong-color, #e23335);
}

.trainer-candidate.is-hint-delete::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 12%;
  width: 76%;
  height: 1.5px;
  border-radius: 999px;
  background: var(--wrong-color, #e23335);
  transform: translateY(-50%) rotate(45deg);
  pointer-events: none;
}

.trainer-candidate.is-chain-on { background: var(--chain-note-on-bg) !important; }
.trainer-candidate.is-chain-off { background: var(--chain-note-off-bg) !important; }
.trainer-candidate.is-chain-pulsing { animation: trainer-chain-note-pulse 420ms ease-in-out; }

@keyframes trainer-chain-note-pulse {
  0%, 100% { transform: scale(1); }
  45% { transform: scale(1.35); }
}

.trainer-cell:nth-child(9n) { border-right: 0; }
.trainer-cell:nth-child(n+73) { border-bottom: 0; }
.trainer-cell:nth-child(9n+3), .trainer-cell:nth-child(9n+6) { border-right: 2px solid var(--grid-color, #404851); }
.trainer-cell:nth-child(n+19):nth-child(-n+27), .trainer-cell:nth-child(n+46):nth-child(-n+54) { border-bottom: 2px solid var(--grid-color, #404851); }

.trainer-cell.is-pattern {
  background: color-mix(in srgb, var(--deep-color, #8bc4e8) 38%, var(--tone-11));
}
.trainer-cell.is-placement-answer { background: color-mix(in srgb, var(--green-color, #4caf50) 20%, var(--tone-11)); }
.trainer-cell.is-peer-digit { background: var(--peer-digit-color, #8bc4e8); }
.trainer-cell.is-digit-selected { background: var(--deep-color, #8bc4e8); }
.trainer-cell.is-candidate-cell {
  background: color-mix(in srgb, var(--accent) 12%, var(--tone-11, #f5f7fb));
  box-shadow: inset 0 0 0 2px var(--accent);
  z-index: 1;
}

.trainer-cell__digit {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--puzzle-color);
  font-family: "Outfit", sans-serif;
  font-size: clamp(14px, calc(var(--grid-size, 550px) * 0.076), 42px);
  font-weight: 500;
  cursor: pointer;
}

.trainer-cell__digit:hover { background: color-mix(in srgb, var(--deep-color, #8bc4e8) 30%, transparent); }

.trainer-cell.is-prepared .trainer-cell__digit { color: var(--user-color, #2a52c2); }

.trainer-candidates {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 100%;
  height: 100%;
}

.trainer-candidate {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: calc(3px * var(--trainer-scale, 1));
  background: transparent;
  color: var(--grid-icons-color, #5a6090);
  font: 500 clamp(7px, calc(var(--grid-size, 550px) * 0.027), 15px)/1 "Outfit", sans-serif;
  cursor: pointer;
}

.trainer-candidate:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.trainer-candidate--empty { cursor: default; }
.trainer-candidate--empty:hover { background: transparent; }
.trainer-candidate.is-peer-note {
  background: var(--peer-digit-color, #8bc4e8);
  color: var(--puzzle-color);
  font-weight: 700;
}
.trainer-candidate.is-pattern {
  background: color-mix(in srgb, var(--deep-color, #8bc4e8) 24%, transparent);
  color: var(--title-color, #01579b);
  box-shadow: inset 0 0 0 2px var(--title-color, #01579b);
  font-weight: 700;
}
.trainer-candidate.is-selected {
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  color: var(--accent);
  box-shadow: inset 0 0 0 2px var(--accent);
  font-weight: 700;
}
/* Elimination-техники: выделение красным (метишь кандидатов на удаление). */
.trainer-board-card.is-elimination-mode .trainer-candidate.is-selected {
  background: color-mix(in srgb, var(--wrong-color, #e23335) 15%, transparent);
  color: var(--wrong-color, #e23335);
  box-shadow: inset 0 0 0 2px var(--wrong-color, #e23335);
}
.trainer-candidate.is-answer {
  position: relative;
  background: color-mix(in srgb, var(--wrong-color, #e23335) 16%, transparent);
  color: var(--wrong-color, #e23335);
  box-shadow: inset 0 0 0 2px var(--wrong-color, #e23335);
  font-weight: 700;
}
.trainer-candidate.is-correct-selection {
  position: relative;
  background: color-mix(in srgb, var(--wrong-color, #e23335) 18%, transparent);
  color: var(--wrong-color, #e23335);
  box-shadow: inset 0 0 0 2px var(--wrong-color, #e23335);
  font-weight: 700;
}
.trainer-candidate.is-answer::after,
.trainer-candidate.is-correct-selection::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 7.5%;
  width: 85%;
  height: 1.4px;
  background: var(--wrong-color, #e23335);
  transform: translateY(-50%) rotate(45deg);
  pointer-events: none;
}
.trainer-candidate.is-placement-selection {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  color: var(--accent);
  box-shadow: inset 0 0 0 2px var(--accent);
  font-weight: 700;
}
.trainer-board-card .trainer-candidate.is-selected.is-wrong-selection {
  background: color-mix(in srgb, var(--wrong-color, #e23335) 13%, transparent);
  color: var(--wrong-color, #e23335);
  border: 2px dashed var(--wrong-color, #e23335);
  box-shadow: none;
}

.trainer-loading {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 40px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--tone-11, #f5f7fb) 92%, transparent);
  text-align: center;
  backdrop-filter: blur(5px);
}
.trainer-loading[hidden] { display: none; }
.trainer-loading strong { margin-top: 5px; font-size: 18px; }
.trainer-loading span { max-width: 380px; color: var(--article-body-color); font-size: 14px; line-height: 1.5; }

.trainer-spinner {
  width: 38px;
  height: 38px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: trainer-spin .8s linear infinite;
}
@keyframes trainer-spin { to { transform: rotate(360deg); } }

.trainer-candidate-bar {
  width: min(100%, var(--grid-size, 550px));
  margin: calc(16px * var(--trainer-scale, 1)) auto 0;
}

/* Candidate-bar (крупные кнопки 1–9) — только для тачскрин-устройств.
   На десктопе без тача заметки нажимаются мышью напрямую. */
html:not([data-touch='true']) .trainer-candidate-bar { display: none; }

.trainer-candidate-bar__digits {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: calc(7px * var(--trainer-scale, 1));
}

.trainer-candidate-bar__digits button {
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: calc(64px * var(--trainer-scale, 1));
  padding: 0;
  border: 1px solid color-mix(in srgb, var(--border) 88%, transparent);
  border-radius: calc(10px * var(--trainer-scale, 1));
  background: var(--tone-minus-one, #fff);
  color: var(--puzzle-color);
  font: 600 calc(20px * var(--trainer-scale, 1))/1 "Outfit", sans-serif;
  cursor: pointer;
  transition: background-color .14s ease, border-color .14s ease, color .14s ease, transform .14s ease;
}

.trainer-candidate-bar__digits button:not(:disabled):not(.is-selected):hover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--tone-minus-one, #fff));
}

.trainer-candidate-bar__digits button:not(:disabled):active { transform: scale(.96); }

.trainer-candidate-bar__digits button.is-selected {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--tone-minus-one, #fff);
  box-shadow: 0 4px 12px color-mix(in srgb, var(--accent) 25%, transparent);
}
.trainer-board-card.is-elimination-mode .trainer-candidate-bar__digits button.is-selected {
  border-color: var(--wrong-color, #e23335);
  background: var(--wrong-color, #e23335);
  box-shadow: 0 4px 12px color-mix(in srgb, var(--wrong-color, #e23335) 25%, transparent);
}

.trainer-candidate-bar__digits button.is-selected:not(:disabled):hover {
  background: color-mix(in srgb, var(--accent) 88%, #000);
}

.trainer-candidate-bar__digits button:disabled {
  opacity: .28;
  cursor: default;
}

.trainer-board-actions {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: calc(10px * var(--trainer-scale, 1));
  width: min(100%, var(--grid-size, 550px));
  margin: calc(18px * var(--trainer-scale, 1)) auto 0;
}

.trainer-coach {
  position: sticky;
  top: 92px;
  padding: 28px;
}

.trainer-coach__icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 24px;
  border-radius: 15px;
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  color: var(--accent);
}
.trainer-coach__icon svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.trainer-coach h2 { margin: 0 0 12px; font-size: 26px; font-weight: 600; letter-spacing: -.025em; }
.trainer-coach > p:not(.trainer-coach__eyebrow) { margin: 0; color: var(--article-body-color); font-size: 15px; line-height: 1.65; }

.trainer-legend {
  display: grid;
  gap: 10px;
  margin: 24px 0;
  padding: 18px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.trainer-legend div { display: flex; align-items: center; gap: 10px; color: var(--article-body-color); font-size: 13px; }
.trainer-legend__swatch { width: 14px; height: 14px; border-radius: 4px; }
.trainer-legend__swatch--mark { border: 2px solid var(--accent); background: color-mix(in srgb, var(--accent) 15%, transparent); }
.trainer-legend__swatch--mark-elim { border: 2px solid var(--wrong-color, #e23335); background: color-mix(in srgb, var(--wrong-color, #e23335) 15%, transparent); }
.trainer-legend__swatch--pattern { background: color-mix(in srgb, var(--deep-color, #8bc4e8) 24%, transparent); box-shadow: inset 0 0 0 2px var(--title-color, #01579b); }
.trainer-legend__swatch--eliminate { position: relative; border: 2px solid var(--wrong-color, #e23335); background: color-mix(in srgb, var(--wrong-color, #e23335) 16%, transparent); }
.trainer-legend__swatch--eliminate::after { content: ''; position: absolute; left: -1px; right: -1px; top: 50%; height: 1.4px; background: var(--wrong-color, #e23335); transform: translateY(-50%) rotate(45deg); }
.trainer-legend__swatch--placement { border: 2px solid var(--accent); background: color-mix(in srgb, var(--accent) 18%, transparent); }
.trainer-legend__swatch--wrong { border: 2px dashed var(--wrong-color, #e23335); background: color-mix(in srgb, var(--wrong-color, #e23335) 13%, transparent); }

.trainer-feedback {
  margin: 0 0 18px;
  padding: 14px 15px;
  border-radius: 12px;
  background: var(--panel);
}
.trainer-feedback[hidden] { display: none; }
.trainer-feedback.is-success { background: color-mix(in srgb, var(--green-color, #4caf50) 14%, var(--tone-minus-one, #fff)); }
.trainer-feedback.is-error { background: color-mix(in srgb, var(--wrong-color, #e23335) 11%, var(--tone-minus-one, #fff)); }
.trainer-feedback strong { display: block; margin-bottom: 5px; font-size: 15px; }
.trainer-feedback p { margin: 0; color: var(--article-body-color); font-size: 13px; line-height: 1.5; }

.trainer-explanation[hidden] { display: none; }
.trainer-explanation {
  display: flex;
  flex-direction: column;
  /* Кап по высоте равен высоте грида слева (квадрат --grid-size). */
  max-height: var(--grid-size, 550px);
}
.trainer-coach.is-explaining .trainer-coach__icon,
.trainer-coach.is-explaining #coachPrompt,
.trainer-coach.is-explaining .trainer-legend,
.trainer-coach.is-explaining .trainer-feedback { display: none; }
.trainer-explanation__body {
  flex: 0 1 auto;
  min-height: 0;
  margin: 0;
  overflow-y: auto;
  color: var(--article-body-color);
  font-size: 15px;
  line-height: 1.65;
  white-space: pre-line;
}
.trainer-explanation__nav {
  display: grid;
  grid-template-columns: 42px 1fr 42px;
  align-items: center;
  gap: 10px;
  margin-top: 22px;
}
.trainer-explanation__nav button {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}
.trainer-explanation__nav button:disabled { cursor: default; opacity: .38; }
.trainer-explanation__nav svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.trainer-explanation__nav span { color: var(--article-body-color); font-size: 13px; font-variant-numeric: tabular-nums; text-align: center; }
.trainer-explanation__close { width: 100%; margin-top: 12px; }

.trainer-guide-link {
  display: flex;
  align-items: center;
  flex: none;
  gap: 7px;
  color: var(--accent);
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
}
.trainer-guide-link:hover span { text-decoration: underline; text-underline-offset: 3px; }

.trainer-how {
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.trainer-how__inner { max-width: var(--article-container); margin: 0 auto; padding: 72px 20px 80px; }
.trainer-how h2 { max-width: 820px; margin: 0 0 var(--article-head-margin); font-size: var(--article-h2-size); font-weight: var(--article-h2-weight); line-height: var(--article-h2-line); letter-spacing: var(--article-h2-spacing); }
.trainer-how__steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 42px; }
.trainer-how__steps article { padding-top: 20px; border-top: 1px solid var(--border); }
.trainer-how__steps span { color: var(--accent); font-size: 13px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.trainer-how__steps h3 { margin: 17px 0 8px; font-size: var(--article-h3-size); font-weight: var(--article-h3-weight); }
.trainer-how__steps p { margin: 0; color: var(--article-body-color); font-size: var(--article-body-size); line-height: var(--article-body-line); }
.trainer-description a { color: var(--accent); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 980px) {
  .trainer-workspace { grid-template-columns: minmax(0, 1fr) 290px; }
  .trainer-coach { padding: 22px; }
}

@media (max-width: 780px) {
  .trainer-shell { padding: 0 16px 40px; }
  .trainer-hero { grid-template-columns: 1fr; gap: 22px; padding-bottom: 28px; }
  .trainer-session { padding: 0; }
  .trainer-picker { grid-template-columns: 1fr 1fr; }
  .trainer-generate { grid-column: 1 / -1; }
  .trainer-workspace { grid-template-columns: 1fr; }
  .trainer-coach { position: static; }
  .trainer-how__steps { grid-template-columns: 1fr; gap: 22px; }
}

@media (max-width: 520px) {
  .trainer-hero h1 { font-size: 40px; }
  .trainer-picker { grid-template-columns: 1fr; padding: 13px; }
  .trainer-generate { grid-column: auto; }
  .trainer-board-card { padding: 14px; border-radius: 17px; }
  .trainer-board-head { margin-bottom: 12px; }
  .trainer-seed { display: none; }
  .trainer-board-actions { grid-template-columns: 1fr 1fr; }
  .trainer-board-actions .trainer-button:first-child { grid-column: 1 / -1; }
  .trainer-button { min-height: 44px; padding: 0 12px; font-size: 13px; }
  .trainer-candidate-bar { margin-top: 12px; padding: 9px; border-radius: 12px; }
  .trainer-candidate-bar__digits { gap: 4px; }
  .trainer-candidate-bar__digits button { min-height: 46px; border-radius: 8px; font-size: 18px; }
  .trainer-how__inner { padding: 54px 16px 60px; }
}

@media (prefers-reduced-motion: reduce) {
  .trainer-spinner { animation-duration: 1.8s; }
  .trainer-button { transition: none; }
  .trainer-cell__hint-digit.is-blinking,
  .trainer-candidate.is-chain-pulsing { animation: none; }
}