:root {
  --bg: #eef2f7;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-strong: #ffffff;
  --line: #d7deea;
  --line-strong: #a8b4c8;
  --text: #17243a;
  --muted: #66758f;
  --primary: #d9f2d0;
  --primary-strong: #43624c;
  --secondary: #8eb09a;
  --accent: #8ab78f;
  --success: #8cc98d;
  --danger: #d65b63;
  --wrong-bg: #fff0f2;
  --shadow: 0 18px 45px rgba(28, 43, 67, 0.12);
  --radius-xl: 18px;
  --radius-lg: 14px;
  --radius-md: 10px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  font-family: "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background: #ffffff;
  color: var(--text);
  font-size: 13px;
}

body.solve-mode {
  height: 100vh;
  overflow: hidden;
}

body.result-mode {
  overflow: hidden;
}

button,
textarea,
input {
  font: inherit;
}

button {
  cursor: pointer;
  border: 0;
}

.app-shell {
  width: min(1520px, calc(100vw - 32px));
  min-width: 450px;
  margin: 16px auto;
  height: calc(100vh - 32px);
  padding: 0;
  overflow: hidden;
}

.eyebrow,
.section-label,
.metric-label {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  font-weight: 700;
  text-transform: uppercase;
}

.hero h1,
.panel h2,
.panel h3 {
  margin: 6px 0 0;
}

.hero h1 {
  font-size: clamp(1.4rem, 2vw, 2rem);
  line-height: 1.1;
}

.hero-copy,
.help-copy,
.example-copy,
.timer-subcopy,
.metric-subcopy {
  color: var(--muted);
}

.hero-copy {
  max-width: 760px;
  margin: 12px 0 0;
  line-height: 1.65;
}

.round-name-display {
  margin: 10px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-strong);
}

.hero-actions,
.panel-actions,
.compact-actions,
.inline-actions,
.tab-row,
.result-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.ghost-button,
.primary-button,
.secondary-button,
.success-button,
.tab-button,
.text-button,
.icon-button,
.calc-key,
.choice-button,
.wrong-chip {
  border-radius: 12px;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease,
    filter 0.18s ease;
}

.ghost-button,
.secondary-button,
.tab-button,
.icon-button {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  color: var(--primary-strong);
}

.ghost-button,
.primary-button,
.secondary-button,
.success-button {
  padding: 9px 13px;
  font-weight: 700;
}

.ghost-button.active,
.tab-button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-strong);
}

.primary-button {
  background: var(--primary);
  color: var(--primary-strong);
}

.primary-button:hover,
.primary-button:active {
  background: #c5e7b8;
}

.secondary-button:hover,
.secondary-button:active,
.success-button:hover,
.success-button:active {
  filter: brightness(0.9);
}

.ghost-button:hover,
.ghost-button:active,
.tab-button:hover,
.tab-button:active,
.icon-button:hover,
.icon-button:active,
.calc-key:hover,
.calc-key:active {
  background: #eef7e9;
  border-color: #b9d1b0;
  color: #35513d;
}

.text-button:hover,
.text-button:active {
  color: #35513d;
  background: #eef7e9;
}

.choice-button:hover,
.choice-button:active {
  background: #eef7e9;
  border-color: #b9d1b0;
}

.choice-button.selected:hover,
.choice-button.selected:active {
  background: #c5e7b8;
  border-color: #c5e7b8;
}

.wrong-chip:hover,
.wrong-chip:active {
  background: #ffdce1;
  border-color: rgba(214, 91, 99, 0.34);
}

.secondary-button {
  background: var(--secondary);
  color: #fff;
}

.success-button {
  background: var(--success);
  color: #24402d;
}

.text-button {
  background: transparent;
  color: var(--primary-strong);
  padding: 8px 10px;
  font-weight: 700;
}

.icon-button {
  width: 42px;
  height: 42px;
  font-weight: 800;
  font-size: 1.1rem;
}

.small-button {
  padding: 4px 8px;
  font-size: 0.72rem;
}

.workspace {
  display: grid;
  gap: 12px;
  align-items: start;
}

.workspace.solve-layout {
  grid-template-columns: 380px 340px;
  justify-content: end;
  height: 100%;
  min-height: 100%;
}

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

.workspace.result-layout .omr-column,
.workspace.result-layout .utility-column {
  display: none;
}

.omr-column,
.utility-column,
.result-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mode-switch-row {
  margin-top: 0;
  justify-content: flex-start;
  align-self: stretch;
}

.panel {
  background: var(--panel);
  border: 1px solid rgba(215, 222, 234, 0.7);
  border-radius: var(--radius-xl);
  box-shadow: none;
  backdrop-filter: none;
}

.panel-header,
.grading-panel,
.answer-sheet-panel,
.status-panel,
.utility-panel,
.result-hero,
.metric-panel,
.result-detail-grid > .panel {
  padding: 12px;
}

.panel-title-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.panel-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel-header-main {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.answer-sheet-title-row {
  flex-direction: row;
  align-items: center;
}

.panel-header-actions {
  flex-wrap: nowrap;
  justify-content: flex-end;
}

.panel-header-actions button {
  flex: 0 0 auto;
  white-space: nowrap;
}

.panel h2,
.panel h3 {
  font-size: 0.95rem;
}

.fill-actions button {
  flex: 1 1 140px;
}

.grading-panel.hidden,
.result-panel.hidden,
.tab-panel,
.hidden {
  display: none;
}

.tab-panel.active {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
}

.status-pill {
  display: inline-flex;
  flex: 0 0 auto;
  align-self: flex-start;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  padding: 8px 10px;
  border-radius: 999px;
  background: rgba(73, 85, 111, 0.1);
  color: var(--primary-strong);
  font-weight: 700;
  font-size: 0.82rem;
}

.field-label {
  display: inline-block;
  margin-top: 14px;
  margin-bottom: 8px;
  color: var(--primary-strong);
  font-weight: 700;
}

.text-input,
.answer-input,
.memo-input {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--line-strong);
  background: #fff;
  padding: 12px;
  resize: vertical;
  min-height: 180px;
  color: var(--text);
}

.text-input {
  min-height: auto;
  padding-top: 14px;
  padding-bottom: 14px;
}

.text-input:focus,
.answer-input:focus,
.memo-input:focus {
  outline: 2px solid rgba(73, 85, 111, 0.18);
  border-color: var(--primary);
}

.error-copy {
  min-height: 22px;
  margin: 10px 0 0;
  color: var(--danger);
  font-weight: 600;
}

.omr-column {
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

.answer-sheet-panel {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.answer-grid {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  gap: 6px;
  min-height: 0;
  overflow: auto;
  padding-right: 4px;
  margin-top: 8px;
}

.answer-row {
  display: grid;
  grid-template-columns: 28px repeat(5, 1fr);
  column-gap: 1px;
  row-gap: 0;
  align-items: center;
}

.answer-row-section-start {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--line-strong);
}

.question-index {
  font-weight: 800;
  color: var(--primary-strong);
  text-align: center;
  font-size: 0.84rem;
}

.question-index-selected-wrong {
  color: #a63b47;
}

.question-index-unanswered-wrong {
  color: #d27a1e;
}

.choice-button {
  width: 22px;
  height: 22px;
  min-height: 22px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--primary-strong);
  font-weight: 700;
  justify-self: center;
  font-size: 0.68rem;
}

.choice-button.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-strong);
}

.choice-button.selected-wrong {
  background: #ffdce1;
  border-color: rgba(214, 91, 99, 0.55);
  color: #a63b47;
}

.status-panel {
  padding-top: 10px;
  padding-bottom: 10px;
  flex: 0 0 auto;
}

.utility-column {
  height: 100%;
  overflow: hidden;
}

.timer-panel {
  flex: 0 0 auto;
  text-align: center;
  padding-top: 10px;
  padding-bottom: 10px;
}

.timer-display {
  margin-top: 0;
  font-size: clamp(0.95rem, 1.2vw, 1.18rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.compact-actions {
  justify-content: center;
  margin-top: 6px;
}

.compact-actions button {
  padding: 4px 8px;
  font-size: 0.72rem;
}

.note-panel {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  height: 280px;
}

#memoPanel,
#drawPanel {
  min-height: 0;
}

.memo-input {
  flex: 1 1 auto;
  min-height: 0;
  height: 100%;
  resize: none;
  overflow: auto;
}

.tab-button {
  flex: 1 1 120px;
  padding: 8px 9px;
  font-weight: 700;
  font-size: 0.8rem;
}

.inline-actions {
  justify-content: flex-end;
  margin: 8px 0;
}

#drawCanvas {
  width: 100%;
  min-height: 0;
  height: 100%;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #fff;
  touch-action: none;
}

.calculator-display {
  margin-top: 8px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  min-height: 40px;
  padding: 8px 10px;
  text-align: right;
  font-size: 1.25rem;
  overflow-wrap: anywhere;
}

.calculator-grid {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
}

.calc-key {
  min-height: 30px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--primary-strong);
  font-size: 0.82rem;
}

.calc-key.wide {
  grid-column: span 2;
}

.calc-key.operator {
  background: rgba(73, 85, 111, 0.08);
}

.result-hero {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-end;
}

.result-grid,
.result-detail-grid {
  display: grid;
  gap: 10px;
}

.result-grid {
  grid-template-columns: minmax(180px, 1.2fr) repeat(3, minmax(100px, 1fr));
}

.result-detail-grid {
  grid-template-columns: minmax(220px, 280px) 1fr;
}

.area-summary-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
  max-height: 280px;
  overflow: auto;
}

.area-summary-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  padding: 10px;
}

.area-summary-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.area-summary-top h4,
.area-summary-top p,
.area-summary-meta,
.area-summary-wrong {
  margin: 0;
}

.area-summary-top h4 {
  font-size: 0.88rem;
}

.area-summary-top p {
  color: var(--muted);
  font-weight: 700;
}

.area-summary-meta {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}

.area-summary-meta span {
  display: block;
  border-radius: 12px;
  background: rgba(73, 85, 111, 0.06);
  padding: 8px 10px;
  font-size: 0.78rem;
}

.area-summary-wrong {
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.35;
  font-size: 0.78rem;
}

.manual-round-form {
  margin-top: 6px;
}

.manual-round-help {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.manual-round-header {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  flex-wrap: wrap;
}

.manual-round-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.manual-area-grid {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.manual-area-card,
.manual-history-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  padding: 16px;
}

.manual-area-card h4,
.manual-history-card h4,
.manual-history-card p {
  margin: 0;
}

.manual-area-range {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.9rem;
}

.manual-area-fields {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.manual-area-fields .text-input {
  min-height: auto;
}

.manual-round-list {
  margin-top: 0;
  max-height: none;
  height: auto;
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
}

.manual-history-panel {
  padding: 14px;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.modal-panel {
  padding: 18px;
}

.manual-round-form {
  padding-top: 8px;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: #fff;
  table-layout: fixed;
}

.history-table th,
.history-table td {
  border: 1px solid var(--line);
  padding: 8px 9px;
  text-align: center;
  vertical-align: middle;
}

.history-table thead th {
  background: rgba(217, 242, 208, 0.82);
  font-weight: 800;
}

.history-table tbody td:first-child {
  font-weight: 700;
  min-width: 130px;
  width: 130px;
  line-height: 1.45;
}

.history-round-name {
  margin-bottom: 6px;
}

.history-action-row {
  display: flex;
  gap: 6px;
  justify-content: center;
  flex-wrap: wrap;
}

.history-edit-button {
  min-width: 52px;
  padding: 4px 8px;
}

.history-answer-button,
.history-delete-button {
  min-width: 52px;
  padding: 4px 8px;
}

.history-wrong-row td {
  color: var(--danger);
  line-height: 1.35;
}

.history-empty {
  color: var(--muted);
  font-size: 0.82rem;
}

.accent-panel {
  background:
    linear-gradient(135deg, rgba(217, 242, 208, 0.9), rgba(255, 255, 255, 0.96)),
    var(--panel);
}

.metric-value {
  margin: 6px 0 4px;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.05em;
}

.metric-value.small {
  font-size: 1.7rem;
}

.wrong-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
  max-height: 180px;
  overflow: auto;
}

.wrong-area-group {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  padding: 8px;
}

.wrong-area-title {
  margin: 0 0 6px;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--primary-strong);
}

.wrong-area-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.wrong-chip {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(214, 91, 99, 0.2);
  background: var(--wrong-bg);
  color: var(--danger);
  font-weight: 700;
  font-size: 0.74rem;
}

.empty-state {
  color: var(--muted);
}

.comparison-grid {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 200px;
  overflow: auto;
}

.comparison-card {
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.92rem;
}

.comparison-card.correct {
  border-color: rgba(121, 183, 122, 0.45);
  background: rgba(121, 183, 122, 0.1);
}

.comparison-card.wrong {
  border-color: rgba(214, 91, 99, 0.3);
  background: var(--wrong-bg);
}

.comparison-line {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  line-height: 1.2;
}

.comparison-question,
.comparison-answer,
.comparison-correct {
  font-weight: 700;
}

.comparison-question,
.comparison-answer {
  color: #d65b63;
}

.comparison-arrow {
  color: var(--primary-strong);
  font-weight: 700;
}

.comparison-correct {
  color: var(--primary-strong);
}

.result-panel {
  height: 100%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.result-panel .result-grid,
.result-panel .result-detail-grid,
.result-panel .manual-round-panel {
  display: none;
}

.manual-history-panel {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(23, 36, 58, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
  z-index: 30;
}

.modal-backdrop.hidden {
  display: none;
}

.modal-panel {
  width: min(960px, calc(100vw - 96px));
  max-height: calc(100vh - 96px);
  overflow: auto;
}

.round-answers-modal-panel {
  width: min(1120px, calc(100vw - 96px));
}

.round-answers-modal-body {
  padding-top: 8px;
}

.round-answers-grid {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  max-height: min(62vh, 720px);
  overflow: auto;
}

.round-answer-card {
  padding: 10px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.78rem;
}

.round-answer-card.correct {
  border-color: rgba(121, 183, 122, 0.45);
  background: rgba(121, 183, 122, 0.1);
}

.round-answer-card.wrong {
  border-color: rgba(214, 91, 99, 0.3);
  background: var(--wrong-bg);
}

.round-answer-card h4,
.round-answer-card p {
  margin: 0;
}

.round-answer-card p + p {
  margin-top: 6px;
}

@media (max-width: 1080px) {
  .workspace.solve-layout {
    grid-template-columns: 380px 340px;
  }
}

@media (max-width: 860px) {
  .app-shell {
    width: min(calc(100vw - 24px), 960px);
    margin: 12px auto;
    height: calc(100vh - 24px);
  }

  .hero,
  .panel-title-row,
  .result-hero {
    flex-direction: column;
    align-items: stretch;
  }

  .panel-header-main {
    flex-direction: row;
    align-items: center;
  }

  .answer-sheet-title-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .result-grid,
  .result-detail-grid {
    grid-template-columns: 1fr;
  }

  .area-summary-meta {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .manual-round-header {
    align-items: stretch;
  }

  .workspace.solve-layout {
    grid-template-columns: 380px 340px;
  }
}

@media (max-width: 520px) {
  .app-shell {
    width: calc(100vw - 16px);
    min-width: 450px;
    margin: 8px auto;
    height: calc(100vh - 16px);
  }

  .panel-header,
  .grading-panel,
  .answer-sheet-panel,
  .status-panel,
  .utility-panel,
  .result-hero,
  .metric-panel,
  .result-detail-grid > .panel {
    padding: 18px;
  }

  .answer-row {
    grid-template-columns: 38px repeat(5, 1fr);
    gap: 6px;
  }
}