:root {
  --paper: #f6f1e6;
  --ink: #1c2430;
  --muted: #5b6573;
  --line: #d7cbb6;
  --card: #fffdf8;
  --accent: #c45c26;
  --accent-dark: #9d4316;
  --grade: #2f5d50;
  --grade-hover: #24483e;
  --correct: #2f6b45;
  --correct-bg: #e7f4ea;
  --wrong: #b42318;
  --wrong-bg: #fdecea;
  --late: #9a6700;
  --late-bg: #fef7e3;
  --shadow: 0 10px 30px rgba(28, 36, 48, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  overflow-y: scroll;
}

@supports (scrollbar-gutter: stable) {
  html {
    overflow-y: auto;
    scrollbar-gutter: stable;
  }
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Nunito", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(196, 92, 38, 0.08), transparent 28%),
    linear-gradient(180deg, #efe6d4 0%, var(--paper) 220px);
}

.page-shell {
  width: 100%;
}

.page {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0 64px;
}

.intro h1 {
  font-family: "Fraunces", serif;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 16px;
}

.kicker {
  margin: 0 0 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--accent);
}

.description {
  max-width: 68ch;
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.65;
}

.how-it-works {
  margin-top: 18px;
  max-width: 68ch;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 253, 248, 0.72);
  padding: 12px 16px;
}

.how-it-works summary {
  cursor: pointer;
  font-weight: 800;
  color: var(--grade);
  list-style: none;
}

.how-it-works summary::-webkit-details-marker {
  display: none;
}

.how-it-works summary::after {
  content: " ▾";
  font-size: 0.9em;
}

.how-it-works[open] summary::after {
  content: " ▴";
}

.how-it-works[open] summary {
  margin-bottom: 12px;
}

.how-it-works-content {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

.how-it-works-content ol {
  margin: 0;
  padding-left: 1.2rem;
}

.how-it-works-content li + li {
  margin-top: 0.55rem;
}

/* Ads aus: body-Klasse "ads-off" entfernen (und SHOW_ADS in script.js) */
body.ads-off .ad-slot,
body.ads-off .ad-mid-row {
  display: none !important;
}

.ad-slot {
  margin-top: 28px;
  display: grid;
  gap: 8px;
  padding: 16px 18px;
  border: 1px dashed #c5b89f;
  border-radius: 16px;
  background:
    repeating-linear-gradient(
      -45deg,
      #f3eee3,
      #f3eee3 8px,
      #efe7d8 8px,
      #efe7d8 16px
    );
}

.ad-kicker {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #8a8070;
}

.ad-body {
  background: rgba(255, 253, 248, 0.92);
  border-radius: 12px;
  padding: 14px 16px;
}

.ad-title {
  margin: 0 0 4px;
  font-weight: 800;
}

.ad-text {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.ad-slot-side {
  display: none;
  margin-top: 36px;
  align-self: start;
  position: sticky;
  top: 24px;
  min-height: 320px;
}

.ad-mid-row:not(.is-hidden) {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.ad-slot-mid {
  margin-top: 0;
}

@media (min-width: 1400px) {
  .page-shell {
    display: grid;
    grid-template-columns: 170px minmax(0, 1180px) 170px;
    justify-content: center;
    gap: 16px;
    padding: 0 16px;
    box-sizing: border-box;
  }

  .page {
    width: auto;
    max-width: 1180px;
    margin: 0;
    grid-column: 2;
  }

  .ad-slot-side:not(.is-hidden),
  .page-shell.is-practicing .ad-slot-side.is-hidden {
    display: grid;
  }

  .page-shell.is-practicing .ad-slot-side.is-hidden {
    visibility: hidden;
    pointer-events: none;
  }

  .ad-mid-row:not(.is-hidden) {
    display: none;
  }

  body.ads-off .page-shell {
    display: block;
    padding: 0;
  }

  body.ads-off .page {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    grid-column: auto;
  }
}

.setup {
  margin-top: 32px;
  display: grid;
  gap: 18px;
}

.setup-block {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
}

.setup-block,
.worksheet {
  scroll-margin-top: 24px;
}

.setup-block h2,
.setup-block label h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.grade-grid,
.term-grid {
  display: grid;
  gap: 10px;
}

.grade-grid {
  grid-template-columns: repeat(6, 1fr);
}

.term-grid {
  grid-template-columns: repeat(2, 1fr);
}

.term-option {
  display: grid;
  gap: 8px;
}

.term-option .grade-btn {
  width: 100%;
}

.term-option .hint {
  margin: 0;
}

.grade-btn,
.create-btn,
.start-btn,
.check-btn {
  font: inherit;
  cursor: pointer;
  border: 0;
}

.grade-btn {
  background: #f3eee3;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 10px;
  font-weight: 800;
}

.grade-btn:hover,
.grade-btn.is-active {
  background: var(--grade);
  color: white;
  border-color: var(--grade);
}

select {
  width: 100%;
  max-width: 360px;
  font: inherit;
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.topic-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
  margin-bottom: 14px;
}

.topic-toolbar:empty,
.topic-toolbar:not(:has(:not(.is-hidden))) {
  margin-bottom: 0;
}

.topic-groups {
  display: grid;
  gap: 18px;
}

.topic-group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.topic-group-head h3 {
  margin: 0;
  font-size: 0.92rem;
}

.group-all {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.group-all input {
  accent-color: var(--grade);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
  gap: 8px;
}

.topic-choice {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 8px;
  row-gap: 2px;
  align-items: start;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8f4ea;
  cursor: pointer;
  user-select: none;
}

.topic-choice input[data-topic] {
  grid-row: 1 / span 2;
  margin: 3px 0 0;
  width: 1.15em;
  height: 1.15em;
  accent-color: var(--grade);
}

.topic-choice-name {
  font-weight: 800;
  line-height: 1.25;
}

.topic-example {
  grid-column: 2;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.35;
}

.topic-choice.is-disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.neg-switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  cursor: pointer;
  user-select: none;
}

.neg-switch.is-hidden {
  display: none;
}

.neg-switch input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.neg-slider {
  width: 44px;
  height: 26px;
  flex-shrink: 0;
  border-radius: 999px;
  background: #d8d0c2;
  position: relative;
  transition: background 0.2s ease;
}

.neg-slider::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 1px 4px rgba(28, 36, 48, 0.2);
  transition: transform 0.2s ease;
}

.neg-switch input:checked + .neg-slider {
  background: var(--grade);
}

.neg-switch input:checked + .neg-slider::after {
  transform: translateX(18px);
}

.neg-switch input:focus-visible + .neg-slider {
  outline: 2px solid var(--grade);
  outline-offset: 2px;
}

option:disabled {
  color: #9aa3ad;
}

.hint {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

#operation-hint {
  margin: 10px 0 0;
}

.hint:empty {
  display: none;
}

.create-btn {
  background: var(--accent);
  color: white;
  border-radius: 12px;
  padding: 12px 18px;
  font-weight: 800;
}

.create-btn:hover {
  background: var(--accent-dark);
}

.worksheet {
  margin-top: 28px;
}

.blocks {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 22rem));
  justify-content: start;
  gap: 16px;
}

.block {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 14px 14px 8px;
  box-shadow: var(--shadow);
  min-width: 0;
  width: 100%;
}

.block h3 {
  margin: 0 0 10px;
  font-size: 0.92rem;
  color: var(--muted);
}

.countdown-setup {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
}

.countdown-setup.is-hidden {
  display: none;
}

.countdown-setup input {
  width: 4.5rem;
  font: inherit;
  font-weight: 800;
  text-align: center;
  padding: 8px 6px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

#create-block:not(.is-hidden) {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 18px;
}

.task-item + .task-item .task {
  border-top: 1px dashed var(--line);
}

.task-notes {
  display: none;
  margin: 0 0 10px 28px;
  gap: 4px;
  max-width: none;
  font-weight: 600;
  color: var(--muted);
  font-size: 0.82rem;
}

.worksheet.has-notes .task-notes {
  display: grid;
}

.task-notes textarea {
  width: 100%;
  min-height: 52px;
  resize: vertical;
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  padding: 8px 10px;
  border: 1px solid #cfc3ad;
  border-radius: 10px;
  background: #fff;
}

.task-notes textarea:focus {
  outline: 2px solid var(--grade);
  border-color: var(--grade);
}

.task {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 8px 8px;
  padding: 7px 0;
  font-weight: 700;
  min-width: 0;
}

.task-eq {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex: 1 1 auto;
  min-width: 0;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  line-height: 1.4;
  padding-top: 0;
}

.task-main {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 8px 10px;
  flex: 1 1 auto;
  min-width: 0;
}

.task:has(.answer-choices) {
  position: relative;
  display: block;
}

.task:has(.answer-choices) .task-num {
  position: absolute;
  left: 0;
  top: 0.55rem;
}

.task:has(.answer-choices) .task-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  justify-items: center;
  text-align: center;
  width: 100%;
  gap: 8px;
}

.task:has(.answer-choices) .task-prompt,
.task:has(.answer-choices) .task-visual {
  width: 100%;
}

.task-visual {
  flex: 1 1 100%;
  display: flex;
  justify-content: center;
  overflow: visible;
}

.task:has(.task-visual):not(:has(.answer-choices)) {
  flex-wrap: wrap;
}

.task:has(.task-visual):not(:has(.answer-choices)) .task-main {
  flex-wrap: wrap;
}

.task-prompt {
  flex: 1 1 auto;
  min-width: 0;
  line-height: 1.4;
  padding-top: 0.15em;
  overflow-wrap: break-word;
}

.task-prompt .mini-table {
  width: max-content;
  border-collapse: collapse;
  margin: 4px 0;
  font-size: 0.9rem;
}

.task-prompt .mini-table th,
.task-prompt .mini-table td {
  border: 1px solid var(--line);
  padding: 3px 8px;
  text-align: center;
}

.geo-svg,
.task-visual svg {
  display: block;
  overflow: visible;
  flex-shrink: 0;
  max-width: 100%;
  height: auto;
}

.number-line {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: flex-end;
  font-variant-numeric: tabular-nums;
}

.number-line span {
  min-width: 2rem;
  text-align: center;
  border-top: 2px solid var(--ink);
  padding: 6px 4px 0;
}

.number-line .nl-missing {
  color: var(--accent);
  font-weight: 800;
}

.answer-choices {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  width: 100%;
  justify-content: center;
  margin: 0;
}

.choice-chip {
  display: inline-flex;
  cursor: pointer;
}

.choice-chip input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  pointer-events: none;
}

.choice-chip span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid #cfc3ad;
  border-radius: 10px;
  background: #fff;
  font-weight: 800;
}

.choice-chip span svg {
  display: block;
  width: 40px;
  height: 40px;
}

.choice-chip input:checked + span {
  border-color: var(--grade);
  background: #e7f0ec;
}

.choice-chip input:focus-visible + span {
  outline: 2px solid var(--grade);
}

.task.is-correct .choice-chip span {
  background: var(--correct-bg);
  border-color: var(--correct);
  color: var(--correct);
}

.task.is-wrong .choice-chip span {
  background: var(--wrong-bg);
  border-color: var(--wrong);
  color: var(--wrong);
}

.task.is-late .choice-chip span {
  background: var(--late-bg);
  border-color: var(--late);
  color: var(--late);
}

.task.is-late.is-correct .choice-chip span {
  background: var(--correct-bg);
  border-color: var(--late);
  color: var(--correct);
  box-shadow: 0 0 0 2px var(--late);
}

.task.is-late.is-wrong .choice-chip span {
  background: var(--wrong-bg);
  border-color: var(--wrong);
  color: var(--wrong);
}

.task .answer-input {
  margin-left: auto;
  flex: 0 0 6.5rem;
  width: 6.5rem;
  max-width: 100%;
  font: inherit;
  font-weight: 800;
  text-align: center;
  padding: 7px 8px;
  border: 1px solid #cfc3ad;
  border-radius: 10px;
  background: #fff;
}

.answer-wrap {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex: 0 0 auto;
}

.answer-wrap .answer-label {
  font-weight: 800;
  white-space: nowrap;
}

.answer-wrap .answer-input {
  margin-left: 0;
}

.task .answer-input.is-wide {
  flex-basis: 8.5rem;
  width: 8.5rem;
}

.task .answer-input:focus {
  outline: 2px solid var(--grade);
  border-color: var(--grade);
}

.worksheet.is-locked .answer-input,
.worksheet.is-locked .sum-digit-input,
.worksheet.is-locked .task-notes textarea {
  background: #f3eee3;
  color: var(--muted);
  cursor: not-allowed;
}

.worksheet.is-locked .choice-chip {
  cursor: not-allowed;
  opacity: 0.7;
}

.worksheet.is-overtime .task:not(.is-correct):not(.is-wrong) .answer-input,
.worksheet.is-overtime .task:not(.is-correct):not(.is-wrong) .sum-digit-input,
.worksheet.is-overtime .task:not(.is-correct):not(.is-wrong) .choice-chip span {
  border-color: var(--late);
}

.worksheet.is-overtime .task:not(.is-correct):not(.is-wrong) .answer-input:focus,
.worksheet.is-overtime .task:not(.is-correct):not(.is-wrong) .sum-digit-input:focus {
  outline-color: var(--late);
  border-color: var(--late);
}

.task.is-stack {
  align-items: flex-start;
  flex-wrap: nowrap;
}

.sum-stack {
  display: grid;
  gap: 2px 0;
  width: max-content;
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, "Cascadia Mono", "Consolas", "Courier New", monospace;
}

.sum-row {
  display: grid;
  grid-template-columns: 1.25em repeat(var(--cols), 1.75em);
  align-items: end;
  justify-items: center;
}

.sum-row-b {
  border-bottom: 2px solid var(--ink);
  padding-bottom: 4px;
}

.sum-op-space {
  min-height: 1em;
}

.sum-op {
  justify-self: start;
  line-height: 1;
}

.sum-digit {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  width: 100%;
  min-height: 1.25em;
  text-align: center;
}

.task.is-stack .sum-digit-input {
  box-sizing: border-box;
  width: 1.55em;
  height: 1.85em;
  margin: 6px 0 0;
  padding: 0;
  flex: none;
  max-width: none;
  font: inherit;
  font-weight: 800;
  line-height: 1.85em;
  text-align: center;
  border: 1px solid #cfc3ad;
  border-radius: 6px;
  background: #fff;
  appearance: none;
}

.task.is-stack .sum-digit-input:focus {
  outline: 2px solid var(--grade);
  outline-offset: 0;
}

.task-num {
  min-width: 1.75rem;
  width: auto;
  flex-shrink: 0;
  color: var(--muted);
  font-size: 0.95em;
  font-weight: 700;
  line-height: 1.4;
  padding-top: 0;
  text-align: right;
}

.task.is-correct .answer-input {
  background: var(--correct-bg);
  border-color: var(--correct);
  color: var(--correct);
}

.task.is-wrong .answer-input {
  background: var(--wrong-bg);
  border-color: var(--wrong);
  color: var(--wrong);
}

.task.is-late .answer-input {
  background: var(--late-bg);
  border-color: var(--late);
  color: var(--late);
}

.task.is-late.is-correct .answer-input {
  background: var(--correct-bg);
  border-color: var(--late);
  color: var(--correct);
  box-shadow: 0 0 0 2px var(--late);
}

.task.is-late.is-wrong .answer-input {
  background: var(--wrong-bg);
  border-color: var(--wrong);
  color: var(--wrong);
}

.task.is-stack.is-correct .sum-digit-input,
.task.is-stack.is-correct .sum-digit-input:disabled {
  background: var(--correct-bg);
  border-color: var(--correct);
  color: var(--correct);
  opacity: 1;
  -webkit-text-fill-color: var(--correct);
}

.task.is-stack.is-wrong .sum-digit-input,
.task.is-stack.is-wrong .sum-digit-input:disabled {
  background: var(--wrong-bg);
  border-color: var(--wrong);
  color: var(--wrong);
  opacity: 1;
  -webkit-text-fill-color: var(--wrong);
}

.task.is-stack.is-late .sum-digit-input,
.task.is-stack.is-late .sum-digit-input:disabled {
  background: var(--late-bg);
  border-color: var(--late);
  color: var(--late);
  opacity: 1;
  -webkit-text-fill-color: var(--late);
}

.task.is-stack.is-late.is-correct .sum-digit-input,
.task.is-stack.is-late.is-correct .sum-digit-input:disabled {
  background: var(--correct-bg);
  border-color: var(--late);
  color: var(--correct);
  opacity: 1;
  -webkit-text-fill-color: var(--correct);
  box-shadow: 0 0 0 2px var(--late);
}

.task.is-stack.is-late.is-wrong .sum-digit-input,
.task.is-stack.is-late.is-wrong .sum-digit-input:disabled {
  background: var(--wrong-bg);
  border-color: var(--wrong);
  color: var(--wrong);
  opacity: 1;
  -webkit-text-fill-color: var(--wrong);
}

.check-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-top: 18px;
}

.check-bar-main {
  flex: 1 1 auto;
  min-width: 0;
}

.check-bar-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  flex: 0 1 auto;
}

.progress {
  margin: 6px 0 0;
  font-weight: 800;
  color: var(--grade);
}

.progress.is-hidden {
  display: none;
}

.new-sheet-btn {
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 12px;
  padding: 10px 14px;
  white-space: nowrap;
}

.new-sheet-btn:hover {
  border-color: var(--grade);
  color: var(--grade);
}

.new-sheet-btn.is-hidden {
  display: none;
}

.pdf-btn {
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  border: 1px solid var(--grade);
  background: #e7f0ec;
  color: var(--grade);
  border-radius: 12px;
  padding: 10px 14px;
  white-space: nowrap;
}

.pdf-btn:hover {
  background: var(--grade);
  color: #fff;
}

.pdf-btn:disabled {
  cursor: wait;
  opacity: 0.75;
}

.pdf-btn.is-hidden {
  display: none;
}

.status {
  margin: 0 auto 0 0;
  font-weight: 700;
  color: var(--muted);
}

.timer {
  margin: 0;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  min-width: 4.2rem;
  text-align: right;
  color: var(--ink);
}

.is-hidden {
  display: none;
}

.success-dialog {
  border: 0;
  padding: 0;
  background: transparent;
  width: 100vw;
  height: 100vh;
  max-width: 100%;
  max-height: 100%;
}

.success-dialog[open] {
  display: grid;
  place-items: center;
}

.success-dialog::backdrop {
  background: rgba(22, 28, 36, 0.58);
}

.fireworks {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.success-card {
  position: relative;
  z-index: 1;
  width: min(420px, calc(100% - 32px));
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 28px 24px 22px;
  text-align: center;
  box-shadow: var(--shadow);
}

.success-card h2 {
  font-family: "Fraunces", serif;
  font-size: 2rem;
  margin: 0 0 8px;
}

.success-card p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 1.05rem;
}

#success-time {
  margin-top: -8px;
  font-weight: 700;
  color: var(--ink);
}

#success-best {
  margin-top: -10px;
  font-weight: 700;
}

#success-best.is-record {
  color: var(--correct);
}

.page-corner {
  position: fixed;
  left: 16px;
  bottom: 16px;
  z-index: 30;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 10px;
  width: max-content;
  max-width: calc(100vw - 32px);
}

.practice-slot:empty {
  display: none;
}

.practice-slot-start,
.practice-slot-check {
  display: none;
}

.practice-slot-footer {
  display: none;
}

.countdown {
  margin: 0;
  width: 100%;
  text-align: center;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  font-size: 1.15rem;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.countdown.is-low {
  border-color: var(--accent);
  color: var(--accent);
}

.countdown.is-over {
  border-color: var(--wrong);
  color: var(--wrong);
  background: var(--wrong-bg);
}

.countdown.is-hidden {
  display: none;
}

.start-btn,
.check-btn {
  width: 100%;
  aspect-ratio: 1;
  height: auto;
  padding: 8px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  font-weight: 800;
  font-size: 0.95rem;
  line-height: 1.15;
  text-align: center;
  box-shadow: var(--shadow);
}

.start-btn {
  border: 1px solid var(--wrong);
  background: var(--wrong-bg);
  color: var(--wrong);
}

.start-btn:hover {
  background: var(--wrong);
  color: #fff;
  border-color: var(--wrong);
}

.start-btn:disabled,
.start-btn:disabled:hover {
  background: #eceae4;
  border-color: var(--line);
  color: #9a958a;
  cursor: not-allowed;
  box-shadow: none;
}

.start-btn.is-hidden,
.check-btn.is-hidden {
  display: none;
}

.check-btn {
  border: 1px solid var(--correct);
  background: var(--correct-bg);
  color: var(--correct);
}

.check-btn:hover {
  background: var(--correct);
  color: #fff;
  border-color: var(--correct);
}

.reset-best-btn {
  font: inherit;
  font-size: 0.88rem;
  font-weight: 800;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  cursor: pointer;
  box-shadow: var(--shadow);
  width: 100%;
}

.reset-best-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.dialog-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.install-banner {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: 16px;
  z-index: 40;
  max-width: 520px;
  margin: 0 auto;
}

.install-banner-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 16px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 253, 248, 0.97);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.install-banner-text {
  flex: 1 1 200px;
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.install-banner-text strong {
  display: block;
  color: var(--ink);
  font-size: 1.02rem;
}

.install-banner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.install-banner-btn {
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 12px;
  padding: 10px 14px;
  white-space: nowrap;
}

.install-banner-btn-primary {
  border-color: var(--grade);
  background: var(--grade);
  color: #fff;
}

.install-banner-btn-primary:hover {
  background: var(--grade-hover);
  border-color: var(--grade-hover);
}

.install-ios-card {
  text-align: left;
}

.install-ios-card h2 {
  text-align: center;
}

.install-ios-steps {
  margin: 0 0 12px;
  padding-left: 1.25rem;
  line-height: 1.55;
}

.install-ios-steps li + li {
  margin-top: 0.45rem;
}

.install-ios-icon {
  display: inline-block;
  font-weight: 800;
  color: var(--grade);
}

.install-ios-card .create-btn {
  width: 100%;
  margin-top: 8px;
}

.legal-page-body .page {
  padding-bottom: 48px;
}

.legal-page {
  max-width: 68ch;
  color: var(--muted);
  line-height: 1.65;
}

.legal-page h2 {
  font-family: "Fraunces", serif;
  color: var(--ink);
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
}

.legal-page h2:first-of-type {
  margin-top: 0;
}

.legal-page p,
.legal-page ul {
  margin: 0 0 1rem;
}

.legal-page ul {
  padding-left: 1.25rem;
}

.legal-page a {
  color: var(--grade);
  font-weight: 700;
}

.legal-note {
  padding: 12px 14px;
  border: 1px solid #e8c89a;
  border-radius: 12px;
  background: #fef7e3;
  color: #7a4d00;
}

.text-link {
  color: var(--grade);
  font-weight: 800;
  text-decoration: none;
}

.text-link:hover {
  text-decoration: underline;
}

.site-footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 10px;
}

.site-footer a {
  color: var(--grade);
  font-weight: 700;
  text-decoration: none;
}

.site-footer a:hover,
.site-footer a[aria-current="page"] {
  text-decoration: underline;
}

@media (prefers-reduced-motion: reduce) {
  .fireworks {
    display: none;
  }
}

@media (max-width: 980px) {
  .grade-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .install-banner {
    left: 12px;
    right: 12px;
    bottom: 12px;
  }

  .install-banner-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .install-banner-actions {
    width: 100%;
  }

  .install-banner-btn {
    flex: 1 1 auto;
  }

  .grade-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .check-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .check-bar-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .pdf-btn,
  .new-sheet-btn {
    width: 100%;
  }

  .timer {
    text-align: left;
  }

  .page-corner {
    display: none;
  }

  .practice-slot-start {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 0 0 16px;
  }

  .practice-slot-start:empty {
    display: none;
  }

  .practice-slot-check {
    display: block;
    margin: 18px 0 0;
  }

  .practice-slot-check:empty {
    display: none;
  }

  .practice-slot-footer {
    display: block;
    width: min(720px, calc(100% - 32px));
    margin: 28px auto 24px;
    padding: 0 0 12px;
  }

  .practice-slot-footer:empty {
    display: none;
  }

  .practice-slot-start .countdown {
    width: 100%;
    box-shadow: none;
  }

  .practice-slot-start .start-btn,
  .practice-slot-check .check-btn {
    width: 100%;
    aspect-ratio: auto;
    min-height: 3.4rem;
    padding: 12px 16px;
    font-size: 1.05rem;
  }

  .practice-slot-footer .reset-best-btn {
    width: 100%;
    box-shadow: none;
  }

  .worksheet .blocks {
    margin-top: 0;
  }
}

.print-header {
  display: none;
}

.pdf-sheet {
  position: absolute;
  left: -10000px;
  top: 0;
  width: 794px;
  padding: 0;
  background: #fff;
  color: #1c2430;
  pointer-events: none;
}

.pdf-page {
  box-sizing: border-box;
  width: 794px;
  height: 1123px;
  padding: 22px 20px 32px;
  background: #fff;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.pdf-sheet .pdf-header {
  flex: 0 0 auto;
  padding: 0 0 12px;
}

.pdf-sheet .pdf-header h1 {
  font-family: "Fraunces", serif;
  font-size: 1.35rem;
  line-height: 1.15;
  margin: 0 0 6px;
}

.pdf-sheet .pdf-header p,
.print-header p {
  margin: 0 0 3px;
  color: #444;
  font-weight: 700;
  font-size: 0.86rem;
}

.pdf-sheet .print-meta,
.print-header .print-meta {
  margin-top: 8px;
  color: var(--ink);
}

.pdf-sheet .pdf-blocks {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  grid-template-rows: 1fr 1fr;
  gap: 10px;
}

.pdf-sheet .block {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 9px 8px 7px 2px;
  box-shadow: none;
  border: 2px solid #333;
  border-radius: 8px;
  background: #fff;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.pdf-sheet .block h3 {
  flex: 0 0 auto;
  margin: 0 0 5px;
  font-size: 0.78rem;
  color: #333;
  font-weight: 800;
}

.pdf-sheet .task-notes {
  display: none !important;
}

.pdf-sheet .task-item {
  flex: 1 1 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.pdf-sheet .task-item + .task-item .task {
  border-top: 2px dashed #666;
}

.pdf-sheet .task {
  position: static;
  display: table;
  table-layout: fixed;
  width: 100%;
  flex: 1;
  min-height: 0;
  padding: 0;
  font-size: 1rem;
  font-weight: 800;
  color: #1c2430;
  border-collapse: collapse;
}

.pdf-sheet .task-num {
  display: table-cell;
  position: static;
  left: auto;
  top: auto;
  transform: none;
  width: 1.75rem;
  min-width: 1.75rem;
  margin: 0;
  padding: 0 0.6rem 0 0;
  vertical-align: middle;
  font-size: 0.7rem;
  color: #777;
  font-weight: 600;
  line-height: 1;
  text-align: right;
  white-space: nowrap;
}

.pdf-sheet .task-eq,
.pdf-sheet .task-main,
.pdf-sheet .sum-stack {
  display: table-cell;
  vertical-align: middle;
  width: auto;
  min-width: 0;
  padding: 0;
  padding-top: 0 !important;
  line-height: 1.2;
}

.pdf-sheet .task-eq,
.pdf-sheet .task-prompt {
  font-size: 1rem;
  color: #1c2430;
}

.pdf-sheet .task-main {
  align-items: center;
}

.pdf-sheet .task .answer-input,
.pdf-sheet .answer-wrap {
  display: inline-block;
  vertical-align: middle;
  width: 3.1rem;
  margin: 0 !important;
  float: none;
  flex: none;
}

.pdf-sheet .pdf-answer-cell {
  display: table-cell;
  vertical-align: middle;
  width: 3.25rem;
  text-align: right;
  line-height: 0;
}

.pdf-sheet .pdf-answer-cell .answer-input,
.pdf-sheet .answer-wrap .answer-input {
  display: inline-block;
  vertical-align: middle;
  box-sizing: border-box;
  width: 3.1rem;
  height: 1.4rem;
  min-height: 1.4rem;
  max-height: 1.4rem;
  margin: 0 !important;
  padding: 0 4px;
  line-height: 1.35rem;
  font-size: 0.95rem;
  font-weight: 800;
  color: #1c2430;
  border: 2px solid #333;
  border-radius: 6px;
  background: #fff;
}

.pdf-sheet .task .answer-input {
  box-sizing: border-box;
  flex-basis: 3.1rem;
  width: 3.1rem;
  height: 1.4rem;
  min-height: 1.4rem;
  max-height: 1.4rem;
  padding: 0 4px;
  line-height: 1.35rem;
  font-size: 0.95rem;
  font-weight: 800;
  color: #1c2430;
  border: 2px solid #333;
  border-radius: 6px;
  background: #fff;
}

.pdf-sheet .pdf-answer-cell .answer-input.is-wide,
.pdf-sheet .task .answer-input.is-wide {
  width: 4.2rem;
}

.pdf-sheet .task:has(.answer-choices) {
  display: table;
  padding-left: 0;
}

.pdf-sheet .task:has(.answer-choices) .task-num {
  display: table-cell;
  position: static;
  left: auto;
  top: auto;
  transform: none;
}

.pdf-sheet .task:has(.answer-choices) .task-main {
  display: table-cell;
  vertical-align: middle;
}

.pdf-sheet .answer-wrap .answer-label {
  color: #1c2430;
  font-size: 0.95rem;
}

.pdf-sheet .task-visual {
  max-height: 42%;
  overflow: hidden;
}

.pdf-sheet .task-visual svg {
  max-width: 100%;
  max-height: 70px;
  height: auto;
}

.pdf-sheet .choice-chip span {
  min-height: 1.85rem;
  padding: 3px 6px;
  font-size: 0.88rem;
  font-weight: 800;
  color: #1c2430;
  border: 2px solid #333;
  border-radius: 6px;
  background: #fff;
}

.pdf-sheet .choice-chip span svg {
  width: 28px;
  height: 28px;
}

@media print {
  body {
    background: #fff;
  }

  .page-shell,
  .page {
    display: block;
    width: auto;
    max-width: none;
    margin: 0;
    padding: 0;
  }

  .intro,
  .setup,
  .ad-slot,
  .ad-mid-row,
  .check-bar,
  .page-corner,
  .practice-slot,
  .success-dialog,
  .pdf-sheet {
    display: none !important;
  }

  .worksheet {
    display: block !important;
    margin: 0;
  }

  .print-header {
    display: block;
    margin: 0 0 16px;
  }

  .print-header h1 {
    font-family: "Fraunces", serif;
    font-size: 1.6rem;
    margin: 0 0 8px;
  }

  .blocks {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px 10px;
  }

  .block {
    break-inside: avoid;
    page-break-inside: avoid;
    box-shadow: none;
    width: 100%;
    margin: 0;
    padding: 9px;
    border: 2px solid #333;
  }

  .block h3 {
    color: #333;
    font-weight: 800;
  }

  .task {
    font-size: 1rem;
    color: #1c2430;
  }

  .task-item + .task-item .task {
    border-top: 2px dashed #666;
  }

  .answer-input {
    border: 2px solid #333 !important;
    background: #fff !important;
    color: #1c2430 !important;
    min-height: 1.85rem;
    font-size: 0.95rem;
  }

  .choice-chip span {
    border: 2px solid #333 !important;
    background: #fff !important;
    color: #1c2430 !important;
  }

  .task-notes,
  .worksheet.has-notes .task-notes {
    display: none !important;
  }
}