/* Milestone 9 final polish: native puzzle dropdown and manual learning path */
.puzzle-select {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 800;
  padding: 0 42px 0 14px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.05);
}

.puzzle-select:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.22);
  border-color: rgba(37, 99, 235, 0.44);
}

.puzzle-select optgroup {
  color: var(--brand-deep);
  font-weight: 950;
}

.puzzle-select option {
  color: var(--ink);
  font-weight: 400;
}

@media (max-width: 900px) {
  .puzzle-select {
    min-height: 46px;
    border-radius: 14px;
    font-size: 1rem;
    padding-left: 12px;
  }
}

.manual-takeaway {
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 15px;
  background: var(--accent-soft);
  padding: 10px 12px;
  color: var(--brand-deep) !important;
  font-weight: 760;
}

.manual-three-up {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.manual-glossary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.manual-glossary-list div {
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--surface);
  padding: 12px;
  display: grid;
  gap: 4px;
}

.manual-glossary-list strong {
  color: var(--brand-deep);
}

.manual-glossary-list span {
  color: var(--muted);
  line-height: 1.35;
}

@media (max-width: 900px) {
  .manual-three-up,
  .manual-glossary-list {
    grid-template-columns: 1fr;
  }
}


/* Milestone 9 corrective polish: manual mobile layout and stacked examples */
.manual-validate-examples {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  align-content: start;
  overflow: visible;
}

.manual-validate-examples .manual-example-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  padding: 12px;
  display: grid;
  justify-items: center;
  gap: 8px;
}

.manual-validate-examples .manual-board {
  width: min(100%, 240px);
}


/* Keep the Validate and hints manual page readable on desktop and mobile. */
#manual-validate.manual-page {
  grid-template-columns: 1fr;
  align-items: start;
}

#manual-validate .manual-page-copy {
  max-width: 82ch;
}

@media (min-width: 980px) {
  #manual-validate .manual-validate-examples {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-height: 760px) and (min-width: 901px) {
  #manual-validate .manual-validate-examples .manual-board {
    width: min(100%, 200px);
  }
}

@media (max-width: 900px) {
  .user-manual {
    overflow: hidden;
  }

  .manual-shell {
    height: 100%;
    min-height: 0;
  }

  .manual-layout {
    min-height: 0;
    overflow: hidden;
  }

  .manual-main {
    display: block;
    overflow-y: auto;
    min-height: 0;
    padding-bottom: 12px;
  }

  .manual-page-status,
  .manual-page,
  .manual-page-nav {
    margin-bottom: 12px;
  }

  .manual-page {
    align-items: start;
  }

  .manual-visual {
    overflow: hidden;
  }
}

@media (max-width: 720px) {
  .manual-header {
    gap: 10px;
    padding: 12px;
  }

  .manual-header h2 {
    font-size: 1.35rem;
    line-height: 1.05;
  }

  .manual-header p {
    font-size: 0.9rem;
    line-height: 1.35;
  }

  .manual-toc {
    padding: 8px;
    gap: 6px;
    max-height: 58px;
  }

  .manual-toc button {
    padding: 8px 10px;
    font-size: 0.86rem;
  }

  .manual-page {
    padding: 12px;
    gap: 12px;
  }

  .manual-page-copy h3 {
    font-size: 1.28rem;
    line-height: 1.1;
  }

  .manual-page-copy p,
  .manual-visual-note {
    font-size: 0.92rem;
    line-height: 1.42;
  }

  .manual-visual {
    padding: 12px;
    border-radius: 16px;
  }

  .manual-board {
    width: min(100%, 280px);
  }

  .manual-real-example-pair .manual-board,
  .manual-validate-examples .manual-board {
    width: min(100%, 260px);
  }

  .manual-cell.sudoku-cell-slot {
    font-size: clamp(0.62rem, 2.7vw, 0.95rem);
  }

  .manual-page-nav {
    gap: 8px;
  }
}

/* Milestone 9 correction: mobile-only styled puzzle dropdown. */
.mobile-puzzle-picker {
  display: none;
  position: relative;
  width: 100%;
}

.mobile-puzzle-picker[hidden],
.mobile-puzzle-picker-menu[hidden] {
  display: none !important;
}

.mobile-puzzle-picker-button {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 800;
  padding: 0 12px 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.05);
  text-align: left;
}

.mobile-puzzle-picker-button:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.22);
  border-color: rgba(37, 99, 235, 0.44);
}

.mobile-puzzle-picker-label {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mobile-puzzle-picker-chevron {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.9rem;
}

.mobile-puzzle-picker-menu {
  position: absolute;
  z-index: 35;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  max-height: min(60vh, 420px);
  overflow-y: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: 0 22px 55px rgba(15, 23, 42, 0.18);
  padding: 8px;
}

.mobile-puzzle-picker-heading {
  color: var(--brand-deep);
  font-weight: 950;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 10px 10px 6px;
}

.mobile-puzzle-picker-option {
  width: 100%;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-weight: 400;
  text-align: left;
  padding: 11px 10px 11px 26px;
  display: block;
}

.mobile-puzzle-picker-option:hover,
.mobile-puzzle-picker-option:focus-visible {
  background: var(--accent-soft);
  outline: none;
}

.mobile-puzzle-picker-option[aria-selected="true"] {
  background: rgba(37, 99, 235, 0.1);
  color: var(--brand-deep);
  font-weight: 500;
}

.mobile-puzzle-picker-option.is-placeholder {
  color: var(--muted);
  font-weight: 400;
}

@media (max-width: 900px) {
  .puzzle-select {
    display: none !important;
  }

  .mobile-puzzle-picker:not([hidden]) {
    display: block;
  }
}

@media (min-width: 901px) {
  .mobile-puzzle-picker {
    display: none !important;
  }
}


/* Milestone 9 correction: force polished mobile puzzle picker and prevent manual overflow. */
@media (max-width: 900px) {
  .loader-card .puzzle-select {
    display: none !important;
  }

  .loader-card .mobile-puzzle-picker:not([hidden]) {
    display: block !important;
  }

  .mobile-puzzle-picker-heading {
    font-weight: 950;
    color: var(--brand-deep);
  }

  .mobile-puzzle-picker-option {
    appearance: none;
    -webkit-appearance: none;
    font-weight: 400;
    padding-left: 26px;
  }
}

.scan-detected-frame {
  position: relative;
  display: inline-block;
  width: fit-content;
  max-width: 100%;
  margin: 12px 0;
  line-height: 0;
}

.scan-detected-frame .scan-detected-canvas {
  display: block;
  margin: 0;
  width: auto;
  max-width: 100%;
  height: auto;
}

.scan-detected-canvas {
  touch-action: none;
  cursor: crosshair;
  max-height: none;
  object-fit: fill;
}

.scan-detected-canvas.can-adjust-corner,
.scan-detected-canvas.is-adjusting {
  cursor: grab;
}

.scan-detected-canvas.is-adjusting {
  cursor: grabbing;
}

.scan-corner-handle {
  position: absolute;
  z-index: 2;
  width: 26px;
  height: 26px;
  padding: 0;
  border: 3px solid rgba(124, 58, 237, 1);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
  transform: translate(-50%, -50%);
  cursor: grab;
  touch-action: none;
}

.scan-corner-handle:hover,
.scan-corner-handle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 5px rgba(124, 58, 237, 0.28);
}

.scan-corner-handle.is-adjusting {
  cursor: grabbing;
}

.scan-corner-handle[hidden] {
  display: none;
}