html {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  overscroll-behavior-x: none;
}

.pythagoras-workbook-shell {
  --wb-ink: #0f172a;
  --wb-muted: #64748b;
  --wb-line: #dbe3ee;
  --wb-soft: #f8fafc;
  --wb-blue: #1d4ed8;
  --wb-blue-soft: #eff6ff;
  margin: 0;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  min-height: 100vh;
  display: block;
  overflow-x: hidden;
  overscroll-behavior-x: none;
  touch-action: pan-y pinch-zoom;
  background:
    radial-gradient(circle at 50% 0, rgba(59, 130, 246, 0.08), transparent 34rem),
    #eef2f7;
  font-family: 'Rubik', Arial, sans-serif;
  color: var(--wb-ink);
  -webkit-tap-highlight-color: transparent;
}

.workbook-toolbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  padding-top: env(safe-area-inset-top, 0px);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid rgba(203, 213, 225, 0.86);
  box-shadow: 0 8px 26px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}

.workbook-toolbar-inner {
  width: min(100%, 1180px);
  margin: 0 auto;
  padding: 10px clamp(10px, 2vw, 22px) 9px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.workbook-brand {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.workbook-eyebrow {
  color: var(--wb-blue);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.workbook-brand-line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.workbook-brand strong {
  color: var(--wb-ink);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.2;
  font-weight: 750;
  white-space: nowrap;
}

#workbook-status {
  max-width: 26rem;
  overflow: hidden;
  color: var(--wb-muted);
  font-size: 12px;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.workbook-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex: 0 0 auto;
}

.workbook-actions button,
.workbook-actions input {
  min-height: 42px;
  border: 1px solid #cbd5e1;
  border-radius: 11px;
  font: inherit;
}

.workbook-actions button {
  padding: 0 15px;
  background: #fff;
  color: var(--wb-ink);
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
  transition: transform 120ms ease, border-color 120ms ease, background-color 120ms ease, box-shadow 120ms ease;
}

.workbook-actions button:not(:disabled):hover {
  border-color: #93c5fd;
  background: var(--wb-blue-soft);
  box-shadow: 0 4px 12px rgba(29, 78, 216, 0.10);
  transform: translateY(-1px);
}

.workbook-actions button:not(:disabled):active {
  transform: translateY(0);
}

.workbook-actions button:focus-visible,
.workbook-actions input:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.24);
  outline-offset: 2px;
}

.workbook-actions button:disabled,
.workbook-actions input:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.workbook-actions .print-action {
  border-color: #0f172a;
  background: #0f172a;
  color: #fff;
}

.workbook-actions .print-action:not(:disabled):hover {
  border-color: #1e293b;
  background: #1e293b;
  color: #fff;
}

.page-jump-control {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 8px 0 10px;
  border: 1px solid #cbd5e1;
  border-radius: 11px;
  background: var(--wb-soft);
  color: #475569;
  font-size: 12px;
  white-space: nowrap;
}

.workbook-actions input {
  width: 58px;
  min-height: 32px;
  padding: 0 6px;
  border-color: #d7dee8;
  border-radius: 8px;
  background: #fff;
  color: var(--wb-ink);
  text-align: center;
  font-weight: 700;
  -moz-appearance: textfield;
}

.workbook-actions input::-webkit-outer-spin-button,
.workbook-actions input::-webkit-inner-spin-button {
  margin: 0;
  -webkit-appearance: none;
}

.workbook-progress {
  width: 100%;
  height: 3px;
  overflow: hidden;
  background: #e8eef6;
}

#workbook-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #2563eb, #38bdf8);
  transition: width 180ms ease;
}

.workbook-pages {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  display: grid;
  justify-items: center;
  gap: 26px;
  padding: 24px 6px 56px;
  direction: ltr;
}

.workbook-page-wrap {
  position: relative;
  width: 100%;
  max-width: 900px;
  min-width: 0;
  overflow: visible;
  direction: ltr;
  scroll-margin-top: var(--pythagoras-toolbar-offset, 82px);
}

.workbook-page-wrap > .a4-page {
  margin: 0 !important;
  direction: rtl;
  transform-origin: top center !important;
  border: 1px solid rgba(203, 213, 225, 0.7);
  box-shadow:
    0 18px 44px rgba(15, 23, 42, 0.12),
    0 2px 8px rgba(15, 23, 42, 0.06);
}

.workbook-page-wrap > .a4-page,
.workbook-page-wrap > .a4-page button,
.workbook-page-wrap > .a4-page input,
.workbook-page-wrap > .a4-page textarea {
  font-family: 'Rubik', Arial, sans-serif;
}

.workbook-page-wrap > .a4-page.geo7-page svg.chart text[direction="ltr"],
.workbook-page-wrap > .a4-page.geo7-page svg.chart text:not([direction]) {
  font-family: 'PytTeX', Georgia, 'Times New Roman', serif;
  font-weight: 400;
}

.workbook-error {
  width: min(794px, calc(100vw - 24px));
  padding: 20px;
  border: 1px solid #fecaca;
  border-radius: 14px;
  background: #fff;
  color: #991b1b;
  box-shadow: 0 10px 24px rgba(127, 29, 29, 0.08);
}

@media (max-width: 860px) {
  .workbook-toolbar-inner {
    align-items: stretch;
    flex-direction: column;
    gap: 8px;
    padding-block: 8px;
  }

  .workbook-brand {
    padding-inline: 2px;
  }

  .workbook-brand-line {
    justify-content: space-between;
  }

  #workbook-status {
    max-width: 48vw;
  }

  .workbook-actions {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr minmax(138px, auto) 1fr auto;
    gap: 7px;
  }

  .workbook-actions button {
    min-width: 0;
    padding-inline: 10px;
  }
}

@media (max-width: 590px) {
  .workbook-toolbar-inner {
    padding: 7px 7px 6px;
  }

  .workbook-eyebrow {
    display: none;
  }

  .workbook-brand-line {
    align-items: center;
    gap: 8px;
  }

  .workbook-brand strong {
    font-size: 17px;
  }

  #workbook-status {
    max-width: 55vw;
    font-size: 11px;
    text-align: left;
  }

  .workbook-actions {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .page-jump-control {
    grid-column: 1 / -1;
    grid-row: 1;
    justify-content: center;
    min-height: 38px;
  }

  .nav-action,
  .print-action {
    grid-row: 2;
    min-height: 42px !important;
  }

  .workbook-actions .print-action {
    padding-inline: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  #workbook-progress-bar,
  .workbook-actions button {
    transition: none;
  }

  html:focus-within {
    scroll-behavior: auto;
  }
}

@media print {
  @page { size: A4; margin: 0; }
  html { width: auto; max-width: none; overflow-x: visible; }
  .pythagoras-workbook-shell { width: auto; max-width: none; overflow-x: visible; background: #fff; touch-action: auto; }
  .workbook-toolbar { display: none !important; }
  .workbook-pages { display: block; width: auto; max-width: none; overflow: visible; padding: 0; direction: rtl; }
  .workbook-page-wrap {
    width: 210mm;
    max-width: none;
    height: 297mm;
    margin: 0;
    direction: rtl;
    break-after: page;
    page-break-after: always;
  }
  .workbook-page-wrap:last-child { break-after: auto; page-break-after: auto; }
  .workbook-page-wrap > .a4-page {
    position: static !important;
    left: auto !important;
    top: auto !important;
    transform: none !important;
    transform-origin: initial !important;
    border: 0 !important;
    box-shadow: none !important;
  }
}