:root {
  --ink: #102a43;
  --ink-soft: #486581;
  --paper: #ffffff;
  --background: #f4f7fa;
  --line: #d7e1ea;
  --blue: #1479c9;
  --blue-dark: #0b5c9e;
  --blue-pale: #dcefff;
  --blue-selected: #8bc9f4;
  --gold: #f4b942;
  --green: #11845b;
  --green-pale: #dff5ec;
  --red: #b42318;
  --red-pale: #fee4e2;
  --navy-cell: #1b2d45;
  --shadow: 0 18px 55px rgba(16, 42, 67, 0.1);
  --radius: 20px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% -5%, rgba(20, 121, 201, 0.13), transparent 28rem),
    var(--background);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
summary:focus-visible,
.skip-link:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  color: white;
  background: var(--ink);
  border-radius: 0.5rem;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  color: white;
  background:
    linear-gradient(118deg, rgba(16, 42, 67, 0.98), rgba(14, 75, 123, 0.95)),
    var(--ink);
  border-bottom: 5px solid var(--gold);
}

.header-inner {
  width: min(1180px, calc(100% - 2rem));
  min-height: 220px;
  margin: 0 auto;
  padding: 3rem 0 3.2rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
}

.eyebrow,
.section-label {
  margin: 0 0 0.45rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.eyebrow {
  color: #bcdcf5;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 0.6rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.15rem, 5vw, 4.7rem);
  line-height: 0.98;
  letter-spacing: -0.045em;
}

h1 span {
  display: block;
  color: #bfe3ff;
  font-size: 0.58em;
  font-style: italic;
  font-weight: 500;
  letter-spacing: -0.025em;
}

.intro {
  max-width: 650px;
  margin-bottom: 0;
  color: #e6f2fa;
  font-size: 1.02rem;
}

.practice-badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 1rem;
  color: var(--ink);
  background: var(--gold);
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 800;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.2);
}

.page-shell {
  width: min(1180px, calc(100% - 2rem));
  margin: -1.65rem auto 4rem;
  position: relative;
}

.progress-card,
.board-card,
.clues-card {
  background: var(--paper);
  border: 1px solid rgba(144, 164, 181, 0.3);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.progress-card {
  display: grid;
  grid-template-columns: auto minmax(180px, 1fr) auto;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 1.1rem;
  padding: 1rem 1.2rem;
}

.section-label {
  color: var(--blue-dark);
}

.progress-copy {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

.progress-track {
  height: 10px;
  overflow: hidden;
  background: #e7edf3;
  border-radius: 999px;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--blue), #47a7df);
  border-radius: inherit;
  transition: width 220ms ease;
}

.save-note {
  margin: 0;
  color: var(--green);
  font-size: 0.79rem;
  font-weight: 700;
  white-space: nowrap;
}

.save-note span {
  display: inline-block;
  margin-right: 0.35rem;
  font-size: 0.65rem;
}

.progress-summary {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.85rem;
}

.score-panel {
  min-width: 86px;
  display: grid;
  grid-template-columns: auto auto;
  align-items: baseline;
  column-gap: 0.25rem;
  padding: 0.48rem 0.7rem;
  color: white;
  background: var(--ink);
  border-radius: 0.72rem;
  text-align: right;
}

.score-panel span {
  grid-column: 1 / -1;
  color: #bcdcf5;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}

.score-panel strong {
  font-size: 1.3rem;
  line-height: 1;
}

.score-panel small {
  color: #d9e8f3;
  font-size: 0.63rem;
  font-weight: 700;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(320px, 0.85fr);
  align-items: start;
  gap: 1.1rem;
}

.board-card,
.clues-card {
  padding: 1.25rem;
}

.board-toolbar,
.clues-heading,
.selected-clue-heading,
.board-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.board-toolbar h2,
.clues-heading h2 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.toolbar-actions,
.clue-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
}

button {
  border: 0;
  border-radius: 0.7rem;
  cursor: pointer;
  font-weight: 750;
  transition:
    transform 130ms ease,
    background-color 130ms ease,
    border-color 130ms ease,
    color 130ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.quiet-button {
  padding: 0.55rem 0.7rem;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  font-size: 0.78rem;
}

.quiet-button:hover:not(:disabled) {
  color: var(--ink);
  background: #f3f7fa;
  border-color: #adc2d3;
}

.quiet-button.danger:hover:not(:disabled) {
  color: var(--red);
  background: var(--red-pale);
  border-color: #f6aaa4;
}

.zoom-button {
  display: none;
}

.selected-clue {
  margin: 1rem 0;
  padding: 1rem;
  background: #f0f7fc;
  border-left: 5px solid var(--blue);
  border-radius: 0.8rem;
}

.selected-clue-heading p {
  margin: 0;
  color: var(--blue-dark);
  font-size: 0.82rem;
  font-weight: 850;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.selected-clue-heading span {
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 700;
}

.selected-clue-text {
  min-height: 2.9rem;
  margin: 0.55rem 0 0.8rem;
  font-size: 1rem;
  font-weight: 650;
}

.concept-hint {
  margin: 0 0 0.8rem;
  padding: 0.75rem 0.85rem;
  color: #614700;
  background: #fff5d6;
  border: 1px solid #f3d77a;
  border-radius: 0.7rem;
  font-size: 0.9rem;
}

.primary-button,
.secondary-button,
.check-all-button {
  min-height: 42px;
  padding: 0.65rem 0.9rem;
  font-size: 0.82rem;
}

.primary-button,
.check-all-button {
  color: white;
  background: var(--blue-dark);
}

.primary-button:hover:not(:disabled),
.check-all-button:hover:not(:disabled) {
  background: #084b82;
}

.secondary-button {
  color: var(--blue-dark);
  background: white;
  border: 1px solid #9dc9e8;
}

.secondary-button:hover:not(:disabled) {
  background: var(--blue-pale);
}

.grid-scroller {
  max-width: 100%;
  overflow: auto;
  overscroll-behavior: contain;
  border-radius: 0.45rem;
}

.crossword-grid {
  width: 100%;
  min-width: 0;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(23, minmax(0, 1fr));
  gap: 1px;
  padding: 2px;
  background: var(--navy-cell);
  border: 1px solid var(--navy-cell);
  user-select: none;
}

.cell {
  min-width: 0;
  position: relative;
  aspect-ratio: 1;
  background: white;
}

.cell.block {
  background: var(--navy-cell);
}

.cell.in-word {
  background: var(--blue-pale);
}

.cell.current {
  background: var(--blue-selected);
  box-shadow: inset 0 0 0 2px var(--blue-dark);
  z-index: 2;
}

.cell.is-correct {
  background: var(--green-pale);
}

.cell.is-error {
  background: var(--red-pale);
  box-shadow: inset 0 0 0 2px var(--red);
}

.cell.is-revealed::after {
  content: "";
  width: 5px;
  height: 5px;
  position: absolute;
  right: 2px;
  bottom: 2px;
  background: #d92d20;
  box-shadow: 0 0 0 1px white;
  border-radius: 50%;
  pointer-events: none;
}

.cell-number {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 2px;
  color: var(--ink);
  font-size: clamp(0.31rem, 0.75vw, 0.58rem);
  font-weight: 800;
  line-height: 1;
  pointer-events: none;
}

.cell-input {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 18% 0 0;
  color: var(--ink);
  background: transparent;
  border: 0;
  border-radius: 0;
  text-align: center;
  text-transform: uppercase;
  font-size: clamp(0.48rem, 1.55vw, 1rem);
  font-weight: 850;
  line-height: 1;
  caret-color: transparent;
}

.cell-input:focus {
  outline: 0;
}

.board-footer {
  align-items: flex-start;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.board-footer p {
  max-width: 560px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.check-all-button {
  flex: 0 0 auto;
}

.clues-card {
  max-height: calc(100vh - 2rem);
  position: sticky;
  top: 1rem;
  overflow: auto;
}

.clues-heading {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.clues-heading p:last-child {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 750;
}

.clues-card section + section {
  margin-top: 1.4rem;
}

.clues-card h3 {
  margin-bottom: 0.55rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.15rem;
}

.clue-list {
  display: grid;
  gap: 0.35rem;
}

.clue-item {
  width: 100%;
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  align-items: start;
  gap: 0.25rem;
  padding: 0.62rem 0.55rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0.65rem;
  text-align: left;
  font-size: 0.82rem;
  font-weight: 540;
  line-height: 1.35;
}

.clue-item:hover {
  background: #f4f8fb;
}

.clue-item.active {
  background: var(--blue-pale);
  border-color: #add6f2;
}

.clue-item.solved {
  color: #196344;
}

.clue-item.solved .clue-number::after {
  content: "✓";
  margin-left: 0.15rem;
  color: var(--green);
  font-size: 0.72rem;
}

.clue-number {
  color: var(--blue-dark);
  font-weight: 900;
}

.toast {
  max-width: min(420px, calc(100% - 2rem));
  position: fixed;
  z-index: 80;
  right: 1rem;
  bottom: 1rem;
  padding: 0.85rem 1rem;
  color: white;
  background: var(--ink);
  border-radius: 0.75rem;
  box-shadow: 0 12px 35px rgba(16, 42, 67, 0.28);
  font-size: 0.88rem;
  font-weight: 700;
}

.completion {
  position: fixed;
  z-index: 90;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: rgba(16, 42, 67, 0.72);
  backdrop-filter: blur(6px);
  overflow: auto;
}

.completion[hidden],
.toast[hidden] {
  display: none;
}

.completion-card {
  width: min(570px, 100%);
  padding: 2rem;
  background: white;
  border-radius: var(--radius);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
  text-align: center;
}

.completion-card h2 {
  margin-bottom: 0.55rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
}

.completion-card p:not(.section-label) {
  color: var(--ink-soft);
}

.completion-copy {
  margin-bottom: 1.25rem;
}

.completion-mark {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  margin: 0 auto 1rem;
  color: white;
  background: var(--green);
  border-radius: 50%;
  font-size: 2rem;
  font-weight: 900;
}

.student-field {
  display: grid;
  gap: 0.4rem;
  margin: 0 0 1rem;
  color: var(--ink);
  text-align: left;
  font-size: 0.78rem;
  font-weight: 800;
}

.student-field input {
  width: 100%;
  min-height: 44px;
  padding: 0.65rem 0.75rem;
  color: var(--ink);
  background: white;
  border: 1px solid #a9bdcd;
  border-radius: 0.65rem;
  font-size: 1rem;
  font-weight: 600;
}

.student-name-print {
  display: none;
}

.proof-summary {
  display: grid;
  grid-template-columns: 1fr 1fr 1.35fr;
  gap: 0.65rem;
  margin: 1rem 0;
}

.proof-summary > div {
  min-width: 0;
  display: grid;
  align-content: center;
  gap: 0.15rem;
  padding: 0.8rem 0.55rem;
  background: #f2f7fa;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
}

.proof-summary span {
  color: var(--ink-soft);
  font-size: 0.67rem;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.proof-summary strong {
  color: var(--ink);
  font-size: 1.15rem;
}

#completedAt {
  font-size: 0.78rem;
  line-height: 1.3;
}

.proof-instruction {
  margin: 0 0 1rem;
  padding: 0.75rem;
  background: #fff5d6;
  border-radius: 0.65rem;
  font-size: 0.78rem;
}

.completion-actions {
  display: flex;
  justify-content: center;
  gap: 0.55rem;
}

.noscript {
  margin: 1rem;
  padding: 1rem;
  color: var(--red);
  background: var(--red-pale);
  border-radius: 0.5rem;
}

@media (max-width: 900px) {
  .header-inner {
    min-height: 190px;
    padding-top: 2.2rem;
  }

  .practice-badge {
    display: none;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .clues-card {
    max-height: none;
    position: static;
    overflow: visible;
  }
}

@media (max-width: 640px) {
  .header-inner,
  .page-shell {
    width: min(100% - 1rem, 1180px);
  }

  .header-inner {
    min-height: 170px;
    padding: 1.75rem 0 2.8rem;
  }

  .intro {
    font-size: 0.9rem;
  }

  .page-shell {
    margin-top: -1.2rem;
  }

  .progress-card {
    grid-template-columns: 1fr;
    gap: 0.6rem;
    padding: 0.85rem 1rem;
  }

  .progress-summary {
    justify-content: space-between;
  }

  .save-note {
    white-space: normal;
  }

  .board-card,
  .clues-card {
    padding: 0.85rem;
    border-radius: 14px;
  }

  .board-toolbar,
  .board-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .toolbar-actions,
  .clue-actions {
    width: 100%;
  }

  .toolbar-actions button,
  .clue-actions button {
    flex: 1 1 auto;
  }

  .zoom-button {
    display: inline-flex;
  }

  .selected-clue {
    margin: 0.8rem 0;
    padding: 0.85rem;
  }

  .selected-clue-text {
    min-height: 0;
    font-size: 0.91rem;
  }

  .crossword-grid.is-zoomed {
    width: 598px;
    min-width: 598px;
  }

  .crossword-grid.is-zoomed .cell-number {
    font-size: 0.5rem;
  }

  .crossword-grid.is-zoomed .cell-input {
    font-size: 0.95rem;
  }

  .board-footer .check-all-button {
    width: 100%;
  }

  .cell-number {
    left: 1px;
  }

  .clues-card section + section {
    margin-top: 1rem;
  }

  .proof-summary {
    grid-template-columns: 1fr 1fr;
  }

  .proof-summary > div:last-child {
    grid-column: 1 / -1;
  }

  .completion-card {
    padding: 1.25rem;
  }

  .completion-actions {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  body {
    background: white;
  }

  .site-header {
    color: var(--ink);
    background: white;
    border-bottom-color: var(--ink);
  }

  .header-inner {
    min-height: auto;
    padding: 1rem 0;
  }

  h1 span,
  .eyebrow,
  .intro {
    color: var(--ink);
  }

  .page-shell {
    width: 100%;
    margin: 0;
  }

  .progress-card,
  .selected-clue,
  .toolbar-actions,
  .board-footer,
  .practice-badge,
  .toast,
  .completion {
    display: none !important;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .board-card,
  .clues-card {
    padding: 0.5rem 0;
    border: 0;
    box-shadow: none;
  }

  .crossword-grid {
    width: 620px;
    margin: 0 auto;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .clues-card {
    max-height: none;
    position: static;
    break-before: page;
    overflow: visible;
  }

  .clue-list {
    grid-template-columns: 1fr 1fr;
  }

  body.printing-proof > :not(.completion) {
    display: none !important;
  }

  body.printing-proof .completion {
    display: block !important;
    position: static;
    padding: 0;
    background: white;
    backdrop-filter: none;
  }

  body.printing-proof .completion-card {
    width: 100%;
    margin: 0;
    padding: 1.5cm;
    border: 2px solid var(--ink);
    box-shadow: none;
  }

  body.printing-proof .completion-actions,
  body.printing-proof .proof-instruction,
  body.printing-proof .student-field {
    display: none !important;
  }

  body.printing-proof .student-name-print {
    display: block;
    margin: 1.1rem 0;
    padding: 0.7rem;
    color: var(--ink);
    border-bottom: 1px solid var(--ink);
    font-size: 1.05rem;
    font-weight: 800;
    text-align: left;
  }

  body.printing-proof .proof-summary {
    grid-template-columns: 1fr 1fr 1.35fr;
  }
}