:root {
  --ink: #14212a;
  --muted: #52605f;
  --soft: #f6fafb;
  --line: #d8e5e1;
  --card: #ffffff;
  --green: #086f96;
  --green-soft: #e7f7f3;
  --blue: #086f96;
  --blue-soft: #e9f5f8;
  --yellow: #ffe100;
  --yellow-soft: #fff8be;
  --sidebar: #043c59;
  --focus-ring: 0 0 0 3px rgba(8, 111, 150, 0.22);
  --hover-shadow: 0 12px 28px rgba(4, 60, 89, 0.10);
}

body {
  background:
    radial-gradient(circle at 92% 8%, rgba(8, 111, 150, 0.08), transparent 28%),
    var(--soft);
}

.app-sidebar {
  background:
    linear-gradient(180deg, rgba(8, 111, 150, 0.24), transparent 38%),
    var(--sidebar);
  box-shadow: inset -1px 0 0 rgba(255, 255, 255, 0.08);
}

.brand-mark {
  background: var(--yellow);
  color: var(--sidebar);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}

.brand-block p,
.app-sidebar p {
  color: rgba(255, 255, 255, 0.66);
}

.nav-item {
  color: rgba(255, 255, 255, 0.76);
  font-weight: 800;
}

.nav-item.is-active {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  box-shadow: inset 3px 0 0 var(--yellow);
}

.nav-item:not(:disabled):hover {
  background: rgba(255, 255, 255, 0.10);
  color: #ffffff;
  transform: translateX(2px);
}

.question-count-badge {
  background: var(--yellow);
  color: var(--sidebar);
}

.app-main {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.76), transparent 220px);
}

.primary-btn {
  background: var(--green);
  color: #ffffff;
  box-shadow: 0 8px 18px rgba(8, 111, 150, 0.14);
}

.primary-btn:not(:disabled):hover {
  background: var(--sidebar);
}

.secondary-btn,
.pill-btn {
  border-color: var(--line);
  background: #ffffff;
  color: var(--ink);
}

.secondary-btn:not(:disabled):hover,
.pill-btn:not(:disabled):hover {
  border-color: rgba(8, 111, 150, 0.38);
  background: #f8fcfd;
}

.secondary-btn.is-active {
  border-color: rgba(8, 111, 150, 0.36);
  background: var(--blue-soft);
  color: var(--green);
}

.app-main .rebuild-card,
.app-main .mock-question-card,
.metric-card,
.topic-card,
.question-card,
.grammar-card,
.mistake-card,
.study-report,
.word-card,
.breakdown-card {
  border-color: var(--line);
  border-radius: 8px;
  background: var(--card);
  box-shadow: 0 8px 22px rgba(4, 60, 89, 0.045);
}

.home-entry-grid {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)) !important;
  gap: 18px !important;
}

.app-main .home-entry-card.rebuild-card {
  position: relative;
  min-height: 210px;
  overflow: hidden;
  display: grid;
  align-content: space-between;
  gap: 18px;
  padding: 22px;
}

.home-entry-card::after {
  content: "";
  position: absolute;
  inset: auto -42px -62px auto;
  width: 150px;
  height: 150px;
  border-radius: 999px;
  background: rgba(8, 111, 150, 0.08);
  pointer-events: none;
}

.home-entry-card-top {
  display: grid;
  gap: 14px;
  align-content: start;
}

.home-entry-symbol {
  width: 58px;
  height: 58px;
  border-radius: 8px;
  display: inline-grid;
  place-items: center;
  background: linear-gradient(135deg, #e8f7fb, #fff8be);
  color: var(--sidebar);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0;
}

.home-entry-card h2 {
  margin: 0;
  color: var(--ink);
  font-size: 24px;
  line-height: 1.2;
}

.home-entry-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.home-entry-card .primary-btn {
  width: fit-content;
  min-width: 96px;
  margin-top: auto;
}

.app-main .topic-card.rebuild-card,
.app-main .topic-detail-grid .rebuild-card,
.app-main .reading-round-grid .rebuild-card,
.app-main .grade-drill-grid .rebuild-card,
.app-main .grade-subject-grid .rebuild-card,
.app-main .grade-writing-grid .rebuild-card {
  display: grid;
  align-content: stretch;
  grid-template-rows: auto 1fr auto;
}

.app-main .topic-card.rebuild-card .primary-btn,
.app-main .topic-detail-grid .rebuild-card .primary-btn,
.app-main .reading-round-grid .rebuild-card .primary-btn,
.app-main .grade-drill-grid .rebuild-card .primary-btn,
.app-main .grade-subject-grid .rebuild-card .primary-btn,
.app-main .grade-writing-grid .rebuild-card .primary-btn {
  align-self: end;
  margin-top: auto;
}

.eyebrow,
.topic-prep-item strong,
.topic-vocab-item strong,
.breakdown-card strong,
.word-card-meaning strong,
.word-card-grammar-title,
.grammar-library-content div,
.writing-answer-row span {
  color: var(--green);
}

.option-btn:hover {
  border-color: var(--green);
  background: #f2fafc;
}

.option-btn.is-selected {
  border-color: var(--green);
  background: var(--blue-soft);
  box-shadow: 0 0 0 2px rgba(8, 111, 150, 0.12);
}

.grammar-filter-btn.is-selected,
.round-filter-btn.is-selected {
  background: var(--green);
  color: #ffffff;
}

.grammar-library-filter {
  background: rgba(255, 255, 255, 0.82) !important;
  border-color: var(--line) !important;
  box-shadow: 0 8px 20px rgba(4, 60, 89, 0.06);
}

.grammar-library-filter-row {
  display: grid !important;
  grid-template-columns: 64px minmax(0, 1fr);
  align-items: start !important;
  gap: 12px 14px !important;
}

.grammar-library-filter-label {
  line-height: 34px !important;
  color: var(--ink) !important;
}

.grammar-library-button-group {
  display: flex !important;
  flex-wrap: wrap !important;
  gap: 8px 10px !important;
  align-items: center;
}

.grammar-filter-btn {
  min-height: 34px !important;
  padding: 7px 16px !important;
  border: 1px solid transparent !important;
  background: transparent !important;
  color: var(--ink) !important;
  font-weight: 800 !important;
}

.grammar-filter-btn:hover {
  background: var(--blue-soft) !important;
  border-color: rgba(8, 111, 150, 0.18) !important;
  color: var(--green) !important;
}

.grammar-filter-btn.is-selected {
  background: var(--green) !important;
  border-color: var(--green) !important;
  color: #ffffff !important;
  box-shadow: 0 8px 18px rgba(8, 111, 150, 0.14);
}

.grammar-filter-btn.is-selected:hover {
  background: var(--sidebar) !important;
  border-color: var(--sidebar) !important;
  color: #ffffff !important;
}

.vocab-level-card.is-selected {
  background: var(--sidebar);
  border-color: var(--sidebar);
}

.vocab-unit-card.is-selected {
  border-color: var(--green);
  background: var(--blue-soft);
  box-shadow: inset 0 0 0 1px rgba(8, 111, 150, 0.2);
}

.word-card-ai-dev.word-card-ai-learning-card,
.word-card-ai-dev.word-card-ai-on-click {
  border: 1px solid var(--line) !important;
  border-radius: 8px !important;
  background: #ffffff !important;
  box-shadow: 0 10px 26px rgba(4, 60, 89, 0.08);
  color: var(--ink);
  display: grid;
  gap: 12px;
  padding: 14px;
}

.word-card-ai-official-head {
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 4px;
  padding-bottom: 10px;
}

.word-card-ai-kicker,
.word-card-ai-dev > strong {
  color: var(--green) !important;
  font-size: 14px;
  font-weight: 900;
}

.word-card-ai-description,
.word-card-ai-context-note,
.word-card-ai-dev-warning {
  color: var(--muted) !important;
  font-weight: 700 !important;
  line-height: 1.65;
  margin: 0;
}

.word-card-ai-main {
  display: grid;
  gap: 7px;
}

.word-card-ai-main-title {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.word-card-ai-main-title strong {
  color: var(--ink);
  font-size: 24px;
  font-weight: 950;
  line-height: 1.25;
}

.word-card-ai-pos {
  background: var(--yellow);
  border-radius: 999px;
  color: var(--sidebar);
  font-size: 12px;
  font-weight: 900;
  padding: 3px 8px;
}

.word-card-ai-base {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  margin: 0;
}

.word-card-ai-meaning {
  color: var(--ink);
  font-size: 16px;
  font-weight: 900;
  line-height: 1.65;
  margin: 0;
}

.word-card-ai-context-meaning {
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
}

.word-card-ai-highlight {
  background: linear-gradient(180deg, var(--blue-soft), #ffffff);
  border: 1px solid rgba(8, 111, 150, 0.14);
  border-radius: 8px;
  display: grid;
  gap: 6px;
  padding: 12px;
}

.word-card-ai-section {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 8px;
  padding-top: 12px;
}

.word-card-ai-highlight strong,
.word-card-ai-section > strong {
  color: var(--green);
  font-size: 14px;
  font-weight: 900;
}

.word-card-ai-highlight p,
.word-card-ai-section p {
  line-height: 1.7;
  margin: 0;
}

.word-card-ai-summary {
  color: var(--muted);
  font-weight: 700;
}

.word-card-ai-morph-grid {
  display: grid;
  gap: 8px;
}

.word-card-ai-morph-item {
  background: #f8fcfd;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 4px;
  padding: 9px 10px;
}

.word-card-ai-morph-head {
  align-items: center;
  display: flex;
  gap: 7px;
}

.word-card-ai-morph-head span {
  color: var(--ink);
  font-weight: 900;
}

.word-card-ai-morph-head em {
  background: var(--yellow-soft);
  border-radius: 999px;
  color: var(--sidebar);
  font-size: 12px;
  font-style: normal;
  font-weight: 900;
  padding: 2px 7px;
}

.word-card-ai-morph-item small {
  color: var(--muted);
  line-height: 1.55;
}

.word-card-ai-example-list,
.word-card-ai-example {
  display: grid;
  gap: 6px;
}

.word-card-ai-translation {
  color: var(--muted);
  font-weight: 700;
}

.word-card-ai-dev .word-card-origin-sentence {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  line-height: 1.65;
  margin: 0;
}

.word-card-ai-dev-speaker {
  align-items: center !important;
  background: var(--yellow) !important;
  border: 1px solid rgba(4, 60, 89, 0.1) !important;
  border-radius: 999px !important;
  color: var(--sidebar) !important;
  display: inline-flex;
  font-size: 11px !important;
  font-weight: 900 !important;
  height: 24px;
  justify-content: center;
  margin-left: 2px !important;
  min-width: 24px;
  padding: 0 7px !important;
}

.word-card-ai-dev-speaker:hover {
  background: var(--yellow-soft) !important;
}

.word-card-ai-debug-stats,
.word-card-ai-debug-rows {
  border-top: 1px dashed var(--line);
  color: #7a8585 !important;
  font-size: 12px;
  margin-top: 2px;
  padding-top: 8px;
}

@media (max-width: 860px) {
  .app-sidebar {
    background: var(--sidebar);
  }

  .app-main .home-entry-card.rebuild-card {
    min-height: 180px;
    padding: 18px;
  }
}