/* ============================================================
   style.css — 컴포넌트 및 애니메이션 (theme.css의 변수 사용)
   ============================================================ */

/* 타이포그래피: Pretendard를 우선 쓰되 CDN 실패 시 시스템 한글 폰트로 폴백합니다.
   숫자는 tabular-nums로 고정폭이라 점수·타이머가 흔들리지 않습니다. */
:root {
  --font-sans: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont,
    'Apple SD Gothic Neo', 'Malgun Gothic', 'Noto Sans KR', system-ui, sans-serif;
}

body {
  font-family: var(--font-sans);
  word-break: keep-all;       /* 한글 단어 중간이 끊기지 않게 */
  overflow-wrap: break-word;
}

/* ---- 연속 학습일(스트릭) ---- */
.streak-flame {
  font-size: 1.75rem;
  line-height: 1;
  filter: grayscale(1);
  opacity: 0.45;
  transition: filter 0.3s, opacity 0.3s;
}
.streak-flame.is-active {
  filter: none;
  opacity: 1;
  animation: streak-pulse 2.4s ease-in-out infinite;
}
@keyframes streak-pulse {
  0%, 100% { transform: scale(1); }
  50%      { transform: scale(1.12); }
}

.streak-week {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.375rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.streak-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}
.streak-day-dot {
  width: 100%;
  aspect-ratio: 1;
  max-height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid transparent;
  color: var(--accent-contrast);
  font-size: 0.8rem;
  font-weight: 700;
}
.streak-day.is-done .streak-day-dot {
  background: var(--accent);
}
.streak-day.is-today .streak-day-dot {
  border-color: var(--accent);
}
.streak-day-label {
  font-size: 0.65rem;
  color: var(--text-muted);
}

/* ---- 성취 순간 축하 연출 (0.9초, 다음 동작을 막지 않도록 pointer-events 없음) ---- */
.celebrate-pop {
  animation: celebrate-pop 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}
@keyframes celebrate-pop {
  0%   { transform: scale(0.86); opacity: 0.4; }
  45%  { transform: scale(1.06); opacity: 1; }
  70%  { transform: scale(0.98); }
  100% { transform: scale(1); }
}

/* 점수·EXP·타이머처럼 자릿수가 바뀌는 숫자는 폭을 고정합니다. */
#stat-exp,
#stat-credits,
#dashboard-exp,
.tabular-nums {
  font-variant-numeric: tabular-nums;
}

/* 접근성 공통: 화면 낭독기 텍스트, 건너뛰기 링크, 명확한 키보드 포커스 */
[hidden],
.hidden {
  display: none !important;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 100;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-contrast);
  transform: translateY(-150%);
  transition: transform 0.15s ease;
}
.skip-link:focus { transform: translateY(0); }

:where(button, a, input, textarea, select, summary, [tabindex]):focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

[role="tabpanel"]:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

/* 1.5 뷰 전환 페이드 */
.view-panel {
  opacity: 0;
  transition: opacity 0.2s ease-in-out;
}
.view-panel.is-active { opacity: 1; }

/* 1.4 내비게이션 상태 */
/* 내비게이션 아이콘: 이모지 대신 stroke SVG를 써서 굵기·크기를 탭마다 통일합니다.
   색은 currentColor를 따르므로 선택/호버 상태가 라벨과 함께 자연히 바뀝니다. */
.nav-icon {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-btn {
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: all 0.15s;
  gap: 0.625rem;
}
.nav-btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}
.nav-btn.active {
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 700;
}

/* ============================================================
   iOS 안전영역(노치·상태바·홈 인디케이터) 처리
   ------------------------------------------------------------
   index.html의 viewport에 viewport-fit=cover가 들어간 뒤에야 아래 env()들이
   실제 값을 갖습니다. 그 전에는 전부 0이라 이 파일의 안전영역 코드가 모두
   죽어 있었고, iOS 실기기에서 상단 콘텐츠가 시계·배터리와 겹쳤습니다.

   ★명시도를 일부러 올렸습니다★ Tailwind CDN은 런타임에 <style>을 head에 주입해서
   이 파일보다 뒤에 올 수 있습니다. `.p-4`, `.top-0` 같은 유틸리티(명시도 0,1,0)에
   지지 않도록 요소+클래스(header.app-header)나 ID로 선택합니다.

   env()는 안전영역이 없는 기기·브라우저에서 0이므로, 아래 규칙은 데스크톱과
   안드로이드에서 아무 것도 바꾸지 않습니다.
   ============================================================ */

/* 앱 헤더 — 모바일에서는 페이지 전체가 스크롤되고 헤더가 고정이 아니라서,
   상태바 자리를 헤더 자신이 확보해야 합니다. */
header.app-header {
  padding-top: calc(1rem + env(safe-area-inset-top));
  padding-left: max(1rem, env(safe-area-inset-left));
  padding-right: max(1rem, env(safe-area-inset-right));
}

/* 화면 위쪽에 고정되는 배너·토스트. top:0 그대로 두면 상태바 밑으로 들어갑니다. */
#fatigue-banner,
#offline-banner {
  top: env(safe-area-inset-top);
}
#toast-container {
  top: calc(1rem + env(safe-area-inset-top));
  right: max(1rem, env(safe-area-inset-right));
}

.mobile-nav-scroll {
  justify-content: flex-start;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
  padding-bottom: env(safe-area-inset-bottom);
}
.nav-btn-mobile {
  color: var(--text-muted);
  flex: 0 0 4.25rem;
  min-height: 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 1rem;
  scroll-snap-align: center;
}
.nav-btn-mobile .nav-icon {
  width: 22px;
  height: 22px;
}
.mobile-nav-label {
  max-width: 4rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.65rem;
}
.nav-btn-mobile.active { color: var(--accent); font-weight: 700; }

@media (max-width: 767px) {
  #view-container {
    padding-bottom: calc(5rem + env(safe-area-inset-bottom));
  }
}

/* 2.2 학적 세그먼트 */
.level-btn {
  background: transparent;
  color: var(--text-muted);
  transition: all 0.15s;
}
.level-btn:hover { color: var(--text-primary); }
.level-btn.active {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* 퀴즈 서브탭 (배틀/퀴즈예측/벼락치기) */
.quiz-subtab-btn {
  background: transparent;
  color: var(--text-muted);
  transition: all 0.15s;
}
.quiz-subtab-btn:hover { color: var(--text-primary); }
.quiz-subtab-btn.active {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* 2.7 저장 성공 시 초록 점멸 */
#sync-dot.pulse-green {
  background: var(--success) !important;
  box-shadow: 0 0 6px var(--success);
}

/* 4-1 펫 float 애니메이션 (향후 사용) */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-8px); }
}
.pet-float { animation: float 3s ease-in-out infinite; }

/* 20-6 디펜스 shake (향후 사용) */
@keyframes shake {
  0%, 100%   { transform: translateX(0); }
  20%, 60%   { transform: translateX(-8px); }
  40%, 80%   { transform: translateX(8px); }
}
.shake-active { animation: shake 0.3s; }

/* 토스트 (재사용) */
.toast {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--shadow-color) 35%, transparent);
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.2s, transform 0.2s;
  min-width: 200px;
  max-width: min(420px, calc(100vw - 2rem));
}
.toast.show { opacity: 1; transform: translateX(0); }
.toast.success { border-color: var(--success); }
.toast.error   { border-color: var(--danger); }
.toast-message { flex: 1; line-height: 1.45; }
.toast-action {
  flex: none;
  min-height: 36px;
  padding: .35rem .65rem;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 750;
}
.toast-close {
  flex: none;
  width: 32px;
  min-height: 32px;
  border-radius: 50%;
  color: var(--text-muted);
  font-size: 1.2rem;
  line-height: 1;
}
.toast-close:hover { background: var(--bg-primary); color: var(--text-primary); }

/* 공용 primary 버튼 */
.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: all 0.15s;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-secondary,
.btn-danger {
  min-height: 44px;
  padding: .5rem .8rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-size: .8rem;
  font-weight: 650;
  transition: border-color .15s, background .15s;
}
.btn-secondary:hover:not(:disabled) { border-color: var(--accent); }
.btn-danger { border-color: color-mix(in srgb, var(--danger) 55%, var(--border-color)); color: var(--danger); }
.btn-danger:hover:not(:disabled) { background: color-mix(in srgb, var(--danger) 12%, var(--bg-elevated)); }
.btn-secondary:disabled,
.btn-danger:disabled { opacity: .5; cursor: not-allowed; }
.text-danger { color: var(--danger); }
.text-danger:hover { color: color-mix(in srgb, var(--danger) 78%, var(--text-primary)); }

/* 인풋 공용 */
.field-input {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  width: 100%;
}
.field-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* 카드 공용 */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1rem;
}

/* 9단계: 마이크 듣는 중 펄스 */
@keyframes mic-pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.25; }
}
.mic-pulse { animation: mic-pulse 1s ease-in-out infinite; color: var(--danger); }

/* 9-4 3D 플립카드 */
.flip-card-outer {
  perspective: 1000px;
  height: 140px;
}
.flip-card-inner {
  position: relative;
  width: 100%; height: 100%;
  transition: transform 0.5s;
  transform-style: preserve-3d;
}
/* 탭·클릭·키보드로 뒤집기 — 모든 기기에서 동작합니다. */
.flip-card-outer.is-flipped .flip-card-inner {
  transform: rotateY(180deg);
}

/* ★호버 뒤집기는 진짜 호버가 되는 기기에서만★ (2026-08-04, C-2)
   iOS 실기기에서 확인된 문제: 터치하면 :hover 상태가 남습니다. 그래서
   첫 탭에 is-flipped가 켜지고 :hover도 함께 걸린 뒤, 다시 탭해 is-flipped를
   꺼도 :hover가 계속 뒤집어 놓아 **카드가 뒷면에 고착**됐습니다.
   두 셀렉터가 같은 rotateY(180deg)를 걸고 있어 서로를 가린 것입니다.
   호버가 없는 기기에서는 이 규칙 자체를 적용하지 않아 클래스 토글만 남깁니다. */
@media (hover: hover) {
  .flip-card-outer:hover .flip-card-inner {
    transform: rotateY(180deg);
  }
}
.flip-card-face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center;
  padding: 0.75rem;
}
.flip-card-front { background: var(--bg-secondary); }
.flip-card-back {
  background: var(--bg-elevated);
  transform: rotateY(180deg);
}

/* 10단계: 능동 인출 가리기 테스트 */
.recall-blank {
  display: inline-block;
  border-bottom: 2px dashed var(--accent);
  padding: 0 2px;
}
.recall-blank.masked {
  background: var(--bg-primary);
  color: var(--bg-primary);
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 1px;
  user-select: none;
}
.recall-blank.masked:hover { outline: 1px solid var(--accent); }
.recall-blank.masked:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}
.recall-correct {
  color: var(--success);
  font-weight: 700;
  border-bottom: 2px solid var(--success);
}
.recall-wrong-hint {
  color: var(--danger);
  font-weight: 700;
  font-size: 0.8em;
}
.recall-inline-input {
  background: var(--bg-primary);
  border: 1px solid var(--accent);
  border-radius: 4px;
  padding: 1px 4px;
  width: 90px;
  font-size: 0.9em;
  color: var(--text-primary);
}

/* 8-2: 문서 분석 로딩 스캔 라인 */
.scan-line {
  position: absolute; left: 0; right: 0; height: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: scan-move 1.2s ease-in-out infinite;
}
@keyframes scan-move {
  0%   { top: 0; opacity: 1; }
  100% { top: 100%; opacity: 0.3; }
}

/* 8-6/8-7: 플로팅 선택 복사 버튼 */
.copy-btn {
  background: var(--accent);
  color: var(--accent-contrast);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--shadow-color) 30%, transparent);
}
.copy-btn:hover { background: var(--accent-hover); }

/* 14단계: 벼락치기 형광펜 */
.cram-line {
  display: block;
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  text-align: left;
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  line-height: 1.6;
}
.cram-line:hover { background: var(--bg-elevated); }
.cram-line.highlighted {
  background: var(--warning);
  color: var(--warning-contrast);
}

/* 17단계: 팟캐스트 재생 중 표시 */
@keyframes podcast-shimmer {
  0%   { opacity: 0.4; }
  50%  { opacity: 1; }
  100% { opacity: 0.4; }
}
.podcast-bar-active { animation: podcast-shimmer 1.2s ease-in-out infinite; }

/* 캔버스 정보를 키보드와 화면 낭독기로도 탐색할 수 있는 텍스트 대안 */
.synapse-list-fallback summary {
  cursor: pointer;
  font-weight: 600;
}
.synapse-list-fallback li + li {
  margin-top: 0.5rem;
}
.synapse-canvas {
  cursor: grab;
  touch-action: none;
}
.synapse-canvas.is-panning { cursor: grabbing; }

/* 사용자가 동작 줄이기를 요청하면 장식 애니메이션과 부드러운 스크롤을 제거 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .view-panel { opacity: 1; }
  .flip-card-inner { transition: none; }
}

/* ============================================================
   AI 학습 코치 - 진단·계획·오답·복습 통합 화면
   ============================================================ */
.coach-shell {
  --coach-soft: color-mix(in srgb, var(--accent) 10%, var(--bg-secondary));
}
.coach-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  overflow: hidden;
  position: relative;
}
.coach-hero::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  right: -70px;
  top: -95px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  pointer-events: none;
}
.coach-loop {
  display: flex;
  align-items: center;
  gap: .35rem;
  flex-wrap: wrap;
  justify-content: flex-end;
  position: relative;
  z-index: 1;
}
.coach-loop span {
  padding: .4rem .65rem;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-elevated);
  font-size: .75rem;
  font-weight: 700;
}
.coach-loop b { color: var(--accent); }
.coach-tabs {
  display: flex;
  gap: .35rem;
  overflow-x: auto;
  padding: .35rem;
  scrollbar-width: thin;
  border: 1px solid var(--border-color);
  border-radius: calc(var(--radius) + 4px);
  background: var(--bg-secondary);
  position: sticky;
  top: -.5rem;
  z-index: 12;
}
.coach-tabs button {
  flex: 0 0 auto;
  min-height: 42px;
  padding: .55rem .8rem;
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: .82rem;
  font-weight: 700;
}
.coach-tabs button:hover { color: var(--text-primary); background: var(--bg-elevated); }
.coach-tabs button.active {
  color: var(--accent-contrast);
  background: var(--accent);
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 24%, transparent);
}
.coach-panel { min-height: 480px; }
.coach-field {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  color: var(--text-muted);
  font-size: .78rem;
  font-weight: 650;
}
.coach-secondary {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: .5rem .85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-size: .82rem;
  font-weight: 650;
  transition: border-color .15s, background .15s, transform .15s;
}
.coach-secondary:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--coach-soft);
}
.coach-secondary:active:not(:disabled) { transform: translateY(1px); }
.coach-secondary:disabled { opacity: .45; cursor: not-allowed; }
.coach-link {
  color: var(--accent);
  font-size: .78rem;
  font-weight: 700;
  padding: .35rem;
  border-radius: 6px;
}
.coach-link:hover { background: var(--coach-soft); }
.coach-badge,
.concept-chip {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: .22rem .52rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: .68rem;
  font-weight: 700;
}
.concept-chip {
  background: var(--coach-soft);
  color: var(--text-primary);
}
.coach-metric span {
  display: block;
  color: var(--text-muted);
  font-size: .75rem;
}
.coach-metric div {
  display: flex;
  align-items: baseline;
  gap: .25rem;
  margin-top: .3rem;
}
.coach-metric b { font-size: 1.7rem; line-height: 1; }
.coach-metric small { color: var(--text-muted); }
.coach-small-stat {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: .65rem;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  text-align: center;
}
.coach-small-stat span { color: var(--text-muted); font-size: .68rem; }
.coach-small-stat b { font-size: 1rem; }
.mission-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
}
.mission-row > button:first-child {
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--accent);
  font-weight: 900;
}
.mission-row.is-done { opacity: .7; }
.mission-row.is-done > div > div:first-child { text-decoration: line-through; }
.coach-action-card {
  display: flex;
  width: 100%;
  flex-direction: column;
  align-items: flex-start;
  gap: .15rem;
  padding: .75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  text-align: left;
}
.coach-action-card:hover { border-color: var(--accent); background: var(--coach-soft); }
.coach-action-card span { color: var(--text-muted); font-size: .72rem; }
.coach-insight {
  padding: .8rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--coach-soft);
}
.coach-insight.warning { border-left-color: var(--warning); }
.coach-insight b { display: block; font-size: .78rem; }
.coach-insight p { margin-top: .25rem; color: var(--text-muted); font-size: .78rem; line-height: 1.55; }
.mastery-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .5rem;
}
.mastery-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .2rem .5rem;
  min-height: 74px;
  padding: .65rem;
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-align: left;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--mastery-color) 18%, transparent) var(--mastery), transparent var(--mastery)),
    var(--bg-primary);
}
.mastery-node:hover { border-color: var(--mastery-color); }
.mastery-node span { font-size: .72rem; font-weight: 700; }
.mastery-node b { color: var(--mastery-color); font-size: .9rem; }
.mastery-node small { color: var(--text-muted); font-size: .62rem; }
.coach-empty {
  display: flex;
  min-height: 150px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  padding: 1.25rem;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius);
  color: var(--text-muted);
  text-align: center;
}
.coach-empty p { max-width: 480px; font-size: .78rem; }
.curriculum-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.curriculum-card {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  transition: border-color .15s, transform .15s;
}
.curriculum-card:hover { transform: translateY(-2px); border-color: var(--accent); }
.curriculum-card.is-selected { box-shadow: inset 3px 0 var(--accent); }
.curriculum-card details summary,
.error-note details summary,
.review-card details summary,
.written-result-mini details summary {
  cursor: pointer;
  color: var(--accent);
  font-size: .75rem;
  font-weight: 700;
}
.coach-selected-units {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  max-height: 140px;
  overflow-y: auto;
}
.coach-selected-units span {
  padding: .35rem .6rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  font-size: .72rem;
}
.coach-step-list {
  display: flex;
  flex-direction: column;
  gap: .65rem;
}
.coach-step-list li { display: flex; align-items: center; gap: .65rem; font-size: .82rem; }
.coach-step-list b {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border-radius: 50%;
  background: var(--coach-soft);
  color: var(--accent);
}
.question-card { max-width: 820px; margin-inline: auto; }
.answer-choice {
  display: block;
  cursor: pointer;
}
.answer-choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.answer-choice span {
  display: flex;
  align-items: center;
  gap: .65rem;
  min-height: 46px;
  padding: .55rem .75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  font-size: .85rem;
}
.answer-choice span b {
  display: grid;
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  place-items: center;
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--text-muted);
}
.answer-choice input:checked + span { border-color: var(--accent); background: var(--coach-soft); }
.answer-choice input:checked + span b { background: var(--accent); color: var(--accent-contrast); }
.answer-choice input:focus-visible + span { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.coach-confidence {
  padding-top: .75rem;
  border-top: 1px solid var(--border-color);
}
.coach-confidence legend {
  color: var(--text-muted);
  font-size: .72rem;
  font-weight: 700;
}
.coach-confidence > div {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .35rem;
  margin-top: .45rem;
}
.coach-confidence label { position: relative; cursor: pointer; }
.coach-confidence input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.coach-confidence span {
  display: flex;
  min-height: 48px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: .35rem;
  border: 1px solid var(--border-color);
  border-radius: 9px;
  background: var(--bg-primary);
  color: var(--text-muted);
  font-size: .62rem;
  text-align: center;
}
.coach-confidence span b { color: var(--text-primary); font-size: .76rem; }
.coach-confidence input:checked + span {
  border-color: var(--accent);
  background: var(--coach-soft);
  color: var(--accent);
}
.coach-confidence input:focus-visible + span { outline: 3px solid var(--focus-ring); outline-offset: 2px; }
.diagnostic-result {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.score-ring {
  display: grid;
  width: 108px;
  height: 108px;
  flex: 0 0 108px;
  place-content: center;
  border-radius: 50%;
  background:
    radial-gradient(circle closest-side, var(--bg-secondary) 78%, transparent 80% 99%),
    conic-gradient(var(--score-color, var(--accent)) calc(var(--score) * 1%), var(--bg-elevated) 0);
  text-align: center;
}
.score-ring b { font-size: 1.8rem; line-height: 1; }
.score-ring span { color: var(--text-muted); font-size: .7rem; }
.coach-bullet-list { display: flex; flex-direction: column; gap: .4rem; }
.coach-bullet-list li {
  position: relative;
  padding-left: 1rem;
  font-size: .8rem;
  line-height: 1.5;
}
.coach-bullet-list li::before {
  content: "•";
  position: absolute;
  left: .2rem;
  color: var(--accent);
}
.saved-question-row,
.focus-history-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .65rem 0;
  border-bottom: 1px solid var(--border-color);
}
.saved-question-row > div,
.focus-history-row > div { min-width: 0; }
.saved-question-row b,
.focus-history-row b {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: .78rem;
}
.saved-question-row span,
.focus-history-row span { display: block; margin-top: .15rem; color: var(--text-muted); font-size: .68rem; }
.saved-question-row button { color: var(--danger); font-size: .72rem; }
.weakness-bars { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .5rem; }
.weakness-bars button {
  display: grid;
  grid-template-columns: 1fr 90px auto;
  align-items: center;
  gap: .5rem;
  padding: .65rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-align: left;
}
.weakness-bars button:hover { border-color: var(--accent); }
.weakness-bars span { font-size: .74rem; font-weight: 700; }
.weakness-bars i { height: 6px; overflow: hidden; border-radius: 999px; background: var(--bg-elevated); }
.weakness-bars i b { display: block; height: 100%; border-radius: inherit; background: var(--accent); }
.weakness-bars strong { font-size: .72rem; }
.weakness-bars small { grid-column: 1 / -1; color: var(--text-muted); font-size: .62rem; }
.error-note,
.review-card {
  display: flex;
  flex-direction: column;
  gap: .65rem;
  padding: .8rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
}
.error-note h3 { font-size: .85rem; font-weight: 700; line-height: 1.55; }
.error-answer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; }
.error-answer-grid p {
  padding: .55rem;
  border-radius: 8px;
  background: var(--bg-elevated);
  font-size: .72rem;
}
.error-answer-grid p b { display: block; margin-bottom: .2rem; color: var(--text-muted); }
.error-answer-grid p:first-child span { color: var(--danger); }
.error-answer-grid p:last-child span { color: var(--success); }
.coach-ai-result {
  padding: .75rem;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--border-color));
  border-radius: var(--radius);
  background: var(--coach-soft);
}
.coach-ai-result > p { margin-top: .35rem; font-size: .78rem; line-height: 1.55; }
.review-card > b { font-size: .8rem; line-height: 1.5; }
.review-card details p { margin-top: .4rem; font-size: .76rem; }
.review-grade-buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: .3rem; }
.review-grade-buttons button {
  min-height: 46px;
  padding: .35rem .2rem;
  border-radius: 8px;
  background: var(--bg-elevated);
  font-size: .68rem;
  font-weight: 700;
}
.review-grade-buttons button:hover { background: var(--coach-soft); color: var(--accent); }
.review-grade-buttons small { color: var(--text-muted); font-size: .58rem; }
.tutor-chat {
  display: grid;
  grid-template-rows: minmax(320px, 1fr) auto;
  gap: .75rem;
  min-height: 540px;
}
.tutor-messages {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  max-height: 520px;
  overflow-y: auto;
  padding: .25rem;
}
.tutor-message {
  max-width: 88%;
  padding: .75rem;
  border-radius: 14px;
  background: var(--bg-elevated);
}
.tutor-message.user { align-self: flex-end; background: var(--accent); color: var(--accent-contrast); border-bottom-right-radius: 4px; }
.tutor-message.assistant { align-self: flex-start; border-bottom-left-radius: 4px; }
.tutor-message b { font-size: .68rem; opacity: .75; }
.tutor-message p { margin-top: .25rem; font-size: .82rem; line-height: 1.6; white-space: pre-wrap; }
.tutor-compose { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: .5rem; }
.written-result-mini {
  padding: .7rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}
.written-result-mini > div { display: flex; justify-content: space-between; gap: .5rem; }
.written-result-mini > div b { color: var(--accent); }
.written-result-mini > div span { color: var(--text-muted); font-size: .68rem; }
.written-result-mini > p,
.written-result-mini details p { margin-top: .35rem; font-size: .76rem; line-height: 1.5; }
.rubric-score-bars {
  display: grid;
  gap: .35rem;
  margin-top: .55rem;
}
.rubric-score-bars > div {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  align-items: center;
  gap: .45rem;
}
.rubric-score-bars span {
  color: var(--text-muted);
  font-size: .66rem;
}
.rubric-score-bars i {
  display: flex;
  min-height: 18px;
  align-items: center;
  justify-content: flex-end;
  padding-right: .35rem;
  border-radius: 5px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--accent) 58%, transparent) var(--bar), var(--bg-elevated) var(--bar));
  font-style: normal;
}
.rubric-score-bars b {
  color: var(--text-primary);
  font-size: .62rem;
}
.summary-note { border-top: 3px solid var(--accent); }
.summary-note > p { line-height: 1.6; }
.focus-stage {
  display: flex;
  min-height: 520px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  text-align: center;
  transition: background .25s, box-shadow .25s;
}
.focus-stage.is-running {
  background:
    radial-gradient(circle at center, color-mix(in srgb, var(--accent) 12%, var(--bg-secondary)), var(--bg-secondary) 68%);
  box-shadow: inset 0 0 80px color-mix(in srgb, var(--accent) 8%, transparent);
}
.focus-stage #focus-label { max-width: 420px; }
.focus-clock {
  font-size: clamp(4rem, 11vw, 7rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.06em;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}
.focus-presets { display: flex; flex-wrap: wrap; justify-content: center; gap: .4rem; }
.focus-presets button {
  padding: .4rem .65rem;
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: .72rem;
}
.focus-presets button:hover:not(:disabled) { color: var(--accent); }
.pronunciation-target {
  display: flex;
  min-height: 190px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
}
.pronunciation-target span { color: var(--text-muted); font-size: .8rem; }
.pronunciation-target b { font-size: 2.4rem; }
.pronunciation-target button { color: var(--accent); font-size: .78rem; }
.share-code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .68rem; word-break: break-all; }
.weekly-report {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.weekly-report > header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--accent);
}
.weekly-report > header p { color: var(--accent); font-size: .65rem; font-weight: 800; letter-spacing: .08em; }
.weekly-report > header h2 { margin-top: .2rem; font-size: 1.35rem; font-weight: 800; }
.weekly-report > header > span { color: var(--text-muted); font-size: .72rem; }
.weekly-report-metrics { display: grid; grid-template-columns: repeat(6, 1fr); gap: .5rem; }
.weekly-report section h3 { margin-bottom: .45rem; font-size: .9rem; font-weight: 800; }
.weekly-report section > p { color: var(--text-muted); font-size: .8rem; line-height: 1.65; }
.weekly-report table { width: 100%; border-collapse: collapse; font-size: .76rem; }
.weekly-report th,
.weekly-report td { padding: .55rem; border-bottom: 1px solid var(--border-color); text-align: left; }
.weekly-report th { color: var(--text-muted); }
.weekly-report footer { padding-top: .75rem; border-top: 1px solid var(--border-color); color: var(--text-muted); font-size: .65rem; }

.coach-lab-intro {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.coach-theory-chips {
  display: flex;
  max-width: 390px;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: .35rem;
}
.coach-theory-chips span {
  padding: .32rem .55rem;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border-color));
  border-radius: 999px;
  background: var(--coach-soft);
  color: var(--accent);
  font-size: .68rem;
  font-weight: 750;
}
.calibration-list {
  display: flex;
  max-height: 360px;
  flex-direction: column;
  gap: .65rem;
  overflow-y: auto;
}
.calibration-row {
  padding: .65rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
}
.calibration-row > div:first-child {
  display: flex;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: .5rem;
}
.calibration-row b { font-size: .76rem; }
.calibration-row > div:first-child span { color: var(--text-muted); font-size: .66rem; }
.calibration-bars {
  display: flex;
  flex-direction: column;
  gap: .25rem;
}
.calibration-bars i {
  display: flex;
  min-height: 19px;
  align-items: center;
  padding-left: .35rem;
  border-radius: 5px;
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--accent) 60%, transparent) var(--bar), var(--bg-elevated) var(--bar));
  font-style: normal;
}
.calibration-bars i.actual {
  background:
    linear-gradient(90deg, color-mix(in srgb, var(--success) 55%, transparent) var(--bar), var(--bg-elevated) var(--bar));
}
.calibration-bars span {
  color: var(--text-primary);
  font-size: .6rem;
  font-weight: 700;
}
.coach-interleave-preview {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.coach-interleave-preview li {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: .55rem;
  min-height: 40px;
  padding: .4rem .55rem;
  border-radius: 9px;
  background: var(--bg-primary);
}
.coach-interleave-preview li > b {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border-radius: 50%;
  background: var(--coach-soft);
  color: var(--accent);
  font-size: .7rem;
}
.coach-interleave-preview li > span { font-size: .74rem; font-weight: 650; }
.coach-interleave-preview li > em { color: var(--text-muted); font-size: .66rem; font-style: normal; }

body.coach-focus-mode #sidebar-desktop,
body.coach-focus-mode #app-shell > main > header,
body.coach-focus-mode #bottombar-mobile,
body.coach-focus-mode .coach-hero,
body.coach-focus-mode .coach-tabs {
  opacity: .12;
  pointer-events: none;
}
body.coach-focus-mode #view-container { padding: 1rem; }
body.coach-focus-mode .focus-stage { min-height: calc(100vh - 2rem); }

@media (max-width: 900px) {
  .mastery-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .weekly-report-metrics { grid-template-columns: repeat(3, 1fr); }
  .weakness-bars { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .coach-hero { align-items: flex-start; flex-direction: column; }
  .coach-loop { justify-content: flex-start; }
  .coach-tabs { top: -.25rem; margin-inline: -.5rem; border-radius: 0; }
  .curriculum-grid { grid-template-columns: 1fr; }
  .mastery-grid { grid-template-columns: 1fr 1fr; }
  .diagnostic-result { align-items: flex-start; flex-direction: column; }
  .score-ring { width: 92px; height: 92px; flex-basis: 92px; }
  .error-answer-grid { grid-template-columns: 1fr; }
  .tutor-compose { grid-template-columns: 1fr; }
  .tutor-compose button { width: 100%; }
  .weekly-report > header { flex-direction: column; }
  .weekly-report-metrics { grid-template-columns: repeat(2, 1fr); }
  .focus-stage { min-height: 430px; }
  .review-grade-buttons { grid-template-columns: repeat(2, 1fr); }
  .coach-confidence > div { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .coach-lab-intro { align-items: flex-start; flex-direction: column; }
  .coach-theory-chips { justify-content: flex-start; }
}

/* 사용자 설정 센터 */
.settings-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.settings-heading .eyebrow {
  color: var(--accent);
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: .12em;
}
.settings-save-status {
  flex: none;
  padding: .3rem .55rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--success) 14%, var(--bg-elevated));
  color: var(--success);
  font-size: .7rem;
  opacity: .55;
  transition: opacity .15s;
}
.settings-save-status.is-visible { opacity: 1; }
.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.settings-section {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: 1.1rem;
}
.settings-section > h2 {
  margin-bottom: .45rem;
  font-size: 1rem;
  font-weight: 800;
}
.settings-data { grid-column: 1 / -1; }
.setting-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(130px, 42%);
  align-items: center;
  gap: .8rem;
  min-height: 64px;
  padding: .55rem 0;
  border-top: 1px solid color-mix(in srgb, var(--border-color) 70%, transparent);
}
.setting-row > span:first-child {
  display: flex;
  flex-direction: column;
  gap: .18rem;
  min-width: 0;
}
.setting-row b { font-size: .82rem; }
.setting-row small {
  color: var(--text-muted);
  font-size: .67rem;
  line-height: 1.45;
}
.setting-row .field-input { max-width: 240px; justify-self: end; }
.setting-input-unit {
  display: flex;
  align-items: center;
  justify-self: end;
  gap: .4rem;
  max-width: 150px;
}
.setting-input-unit em {
  color: var(--text-muted);
  font-size: .75rem;
  font-style: normal;
}
.switch-control {
  position: relative;
  display: inline-flex;
  width: 48px;
  height: 28px;
  justify-self: end;
  flex: none;
}
.switch-control input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.switch-control i {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--bg-elevated);
  cursor: pointer;
  transition: background .16s, border-color .16s;
}
.switch-control i::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: transform .16s, background .16s;
}
.switch-control input:checked + i {
  border-color: var(--accent);
  background: var(--accent);
}
.switch-control input:checked + i::after {
  background: var(--accent-contrast);
  transform: translateX(20px);
}
.switch-control input:focus-visible + i {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}
.switch-control input:disabled + i {
  cursor: not-allowed;
  opacity: .55;
}

.settings-section-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .75rem;
}
.settings-section-heading p {
  margin-top: .25rem;
  color: var(--text-muted);
  font-size: .75rem;
  line-height: 1.5;
}
.settings-pet-section,
.settings-help {
  grid-column: 1 / -1;
}
.pet-preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: .75rem;
  margin: .85rem 0;
}
.pet-preset-card {
  position: relative;
  display: grid;
  gap: .55rem;
  padding: .85rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  cursor: pointer;
  transition: border-color .16s, background .16s, transform .16s;
}
.pet-preset-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}
.pet-preset-card.is-selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 9%, var(--bg-primary));
  box-shadow: inset 0 0 0 1px var(--accent);
}
.pet-preset-card input {
  position: absolute;
  inset: .6rem .6rem auto auto;
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}
.pet-preset-card:has(input:focus-visible) {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}
.pet-preset-preview {
  display: flex;
  align-items: center;
  gap: .2rem;
  padding-right: 1.15rem;
  font-size: 1.25rem;
}
.pet-preset-preview span {
  display: grid;
  place-items: center;
  min-width: 1.65rem;
  min-height: 1.65rem;
  border-radius: 999px;
  background: var(--bg-elevated);
}
.pet-preset-copy {
  display: grid;
  gap: .15rem;
}
.pet-preset-copy small {
  color: var(--text-muted);
  font-size: .7rem;
  line-height: 1.45;
}
.settings-callout {
  margin-top: .6rem;
  padding: .8rem;
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border-color));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--accent) 7%, var(--bg-primary));
  color: var(--text-muted);
  font-size: .72rem;
  line-height: 1.55;
}
.settings-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .5rem;
}
.settings-stat-grid > span {
  display: flex;
  min-height: 72px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--bg-primary);
}
.settings-stat-grid b { color: var(--accent); font-size: 1.2rem; }
.settings-stat-grid small { color: var(--text-muted); font-size: .66rem; }
.settings-action-grid {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

/* 빠른 실행 */
#command-palette[aria-hidden="false"] { display: flex; }
.command-palette-panel { padding: 1rem; box-shadow: 0 24px 80px color-mix(in srgb, var(--shadow-color) 45%, transparent); }
.command-palette-panel kbd,
#command-palette-open kbd {
  margin-left: .2rem;
  padding: .08rem .28rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-muted);
  font-size: .62rem;
}
.icon-close {
  display: grid;
  min-width: 40px;
  min-height: 40px;
  place-items: center;
  border-radius: 50%;
  color: var(--text-muted);
}
.icon-close:hover { background: var(--bg-elevated); color: var(--text-primary); }
.command-results {
  display: flex;
  max-height: min(440px, 55vh);
  flex-direction: column;
  gap: .2rem;
  overflow-y: auto;
}
.command-result {
  display: flex;
  min-height: 48px;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding: .6rem .7rem;
  border: 1px solid transparent;
  border-radius: 9px;
  text-align: left;
}
.command-result small { color: var(--text-muted); }
.command-result:hover,
.command-result.is-selected {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border-color));
  background: color-mix(in srgb, var(--accent) 9%, var(--bg-elevated));
}
.command-empty { padding: 1.25rem; text-align: center; color: var(--text-muted); font-size: .8rem; }
.scroll-to-top {
  right: 1.25rem;
  bottom: 1.25rem;
  width: 46px;
  height: 46px;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background: var(--bg-secondary);
  color: var(--accent);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--shadow-color) 25%, transparent);
  font-size: 1.2rem;
  font-weight: 800;
}

/* 전역 표시 환경 */
html { font-size: var(--app-font-scale, 100%); }
html[data-font-scale="large"] { font-size: var(--app-font-scale, 112.5%); }
html[data-font-scale="xlarge"] { font-size: var(--app-font-scale, 125%); }
body.density-compact .card { padding: .72rem; }
body.density-compact :where(.space-y-6) > :not([hidden]) ~ :not([hidden]) { margin-top: .85rem; }
body.large-touch-targets :where(button, input, select, textarea, [role="button"]) { min-height: 48px; }
body.large-touch-targets .switch-control input { min-height: 1px; }
body.large-touch-targets .task-check { width: 28px; min-height: 28px; }
body.high-contrast {
  --border-color: color-mix(in srgb, var(--text-primary) 62%, var(--bg-primary));
  --text-muted: color-mix(in srgb, var(--text-primary) 82%, var(--bg-primary));
}
body.high-contrast :where(.card, .field-input) { border-width: 2px; }
body.reduce-motion *,
body.reduce-motion *::before,
body.reduce-motion *::after {
  scroll-behavior: auto !important;
  animation-duration: .001ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: .001ms !important;
}
body :where(button, [role="button"])[style*="background:var(--accent)"],
body :where(button, [role="button"])[style*="background: var(--accent)"] {
  color: var(--accent-contrast) !important;
}
body [style*="background:var(--success)"],
body [style*="background: var(--success)"] {
  color: var(--success-contrast) !important;
}
body [style*="background:var(--danger)"],
body [style*="background: var(--danger)"] {
  color: var(--danger-contrast) !important;
}
body:has(#fatigue-banner:not(.hidden)) #offline-banner { top: 2.25rem; }
body:has(#offline-banner:not(.hidden)) #toast-container { top: 2.75rem; }
body:has(#fatigue-banner:not(.hidden)) #toast-container { top: 3.25rem; }
body:has(#fatigue-banner:not(.hidden)):has(#offline-banner:not(.hidden)) #toast-container { top: 5rem; }

/* 화면 꾸미기 전용 모달 */
.theme-customizer-modal {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(.75rem, 2vw, 1.5rem);
  background: color-mix(in srgb, var(--overlay-color) 76%, transparent);
  color: var(--text-primary);
  overscroll-behavior: contain;
}
.theme-customizer-modal[aria-hidden="true"] { display: none; }
.theme-customizer-modal[aria-hidden="false"] { display: flex; }

.theme-customizer-panel {
  display: grid;
  width: min(1180px, 100%);
  max-width: none;
  max-height: min(880px, calc(100dvh - 2rem));
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: calc(var(--radius) + .5rem);
  background: var(--bg-secondary);
  box-shadow: 0 24px 80px color-mix(in srgb, var(--shadow-color) 46%, transparent);
}
.theme-customizer-panel.card { padding: 0; }
.theme-customizer-panel > #theme-customizer-content {
  display: grid;
  min-height: 0;
  grid-template-rows: minmax(0, 1fr) auto auto;
  margin-top: 0;
  overflow: hidden;
}

.theme-customizer-header,
.theme-customizer-panel > :first-child,
.theme-customizer-footer {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .9rem 1rem;
  background: color-mix(in srgb, var(--bg-secondary) 88%, var(--bg-elevated));
}
.theme-customizer-header {
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}
.theme-customizer-panel > :first-child {
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}
.theme-customizer-header > div,
.theme-customizer-panel > :first-child > div {
  min-width: 0;
}
.theme-customizer-header h2,
.theme-customizer-panel > :first-child h2 {
  font-size: 1.1rem;
  font-weight: 850;
  line-height: 1.25;
}
.theme-customizer-header p,
.theme-customizer-panel > :first-child p {
  margin-top: .2rem;
  color: var(--text-muted);
  font-size: .72rem;
  line-height: 1.45;
}
.theme-customizer-header > button,
.theme-customizer-panel > :first-child > button {
  flex: none;
}
.theme-customizer-footer {
  justify-content: flex-end;
  flex-wrap: wrap;
  border-top: 1px solid var(--border-color);
}

.theme-customizer-body {
  display: grid;
  min-height: 0;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
  align-items: start;
  gap: 1rem;
  padding: 1rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}
.theme-customizer-controls {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: .85rem;
}
.theme-customizer-preview-column {
  position: sticky;
  top: 0;
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: .75rem;
}
.theme-customizer-preview-column > :first-child h3 {
  font-size: .86rem;
  font-weight: 800;
}
.theme-customizer-preview-column > :first-child p {
  margin-top: .2rem;
  color: var(--text-muted);
  font-size: .68rem;
  line-height: 1.5;
}

.theme-section {
  min-width: 0;
  padding: .9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg-elevated) 38%, var(--bg-secondary));
}
.theme-section > header,
.theme-section > .theme-section-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .75rem;
  margin-bottom: .75rem;
}
.theme-section h3 {
  font-size: .86rem;
  font-weight: 800;
}
.theme-section p,
.theme-section small {
  color: var(--text-muted);
  font-size: .68rem;
  line-height: 1.5;
}

.theme-color-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .65rem;
}
.theme-color-control {
  display: grid;
  min-width: 0;
  gap: .4rem;
  padding: .65rem;
  border: 1px solid color-mix(in srgb, var(--border-color) 72%, var(--bg-secondary));
  border-radius: var(--radius);
  background: var(--bg-secondary);
}
.theme-color-control > label,
.theme-color-control > span:first-child {
  overflow-wrap: anywhere;
  font-size: .72rem;
  font-weight: 750;
}
.theme-color-inputs {
  display: grid;
  min-width: 0;
  grid-template-columns: 48px minmax(0, 1fr) 44px;
  align-items: center;
  gap: .5rem;
}
.theme-color-picker {
  width: 48px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  padding: 3px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  cursor: pointer;
}
.theme-color-picker::-webkit-color-swatch-wrapper { padding: 0; }
.theme-color-picker::-webkit-color-swatch {
  border: 0;
  border-radius: calc(var(--radius) * .65);
}
.theme-color-picker::-moz-color-swatch {
  border: 0;
  border-radius: calc(var(--radius) * .65);
}
.theme-color-hex {
  width: 100%;
  min-width: 0;
  min-height: 44px;
  padding: .55rem .65rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: .74rem;
  text-transform: uppercase;
}
.theme-color-hex::placeholder {
  color: var(--text-muted);
  text-transform: none;
}
.theme-color-hex[aria-invalid="true"] {
  border-color: var(--danger);
}

.theme-range-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(140px, .8fr);
  align-items: center;
  gap: .65rem;
  min-height: 52px;
}
.theme-range-row + .theme-range-row {
  border-top: 1px solid var(--border-color);
}
.theme-range-row > span {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  font-size: .74rem;
  font-weight: 750;
}
.theme-range-row input[type="range"] {
  width: 100%;
  min-height: 44px;
  accent-color: var(--accent);
  cursor: pointer;
}
.theme-range-row output {
  min-width: 3.25rem;
  padding: .3rem .45rem;
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-muted);
  font-size: .7rem;
  font-variant-numeric: tabular-nums;
  text-align: center;
}

.theme-preset-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: .5rem;
}
.theme-preset-toolbar > label {
  grid-column: 1 / -1;
  color: var(--text-muted);
  font-size: .68rem;
  font-weight: 750;
}
.theme-preset-toolbar :where(input, button),
.theme-preset-list button,
.theme-customizer-footer button,
.theme-customizer-header button {
  min-height: 44px;
}
.theme-preset-toolbar input {
  min-width: 0;
  padding: .55rem .65rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
}
.theme-preset-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .5rem;
  margin-top: .65rem;
}
.theme-preset-list > li,
.theme-preset-list > div {
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: .4rem;
  padding: .35rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-primary);
}
.theme-preset-list button {
  min-width: 44px;
  border-radius: var(--radius);
}
.theme-preset-list [data-theme-preset-select] {
  min-width: 0;
  overflow-wrap: anywhere;
  text-align: left;
}
.theme-preset-list button:hover {
  background: var(--bg-elevated);
  color: var(--accent);
}
.theme-preset-list [aria-current="true"],
.theme-preset-list .is-active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, var(--bg-primary));
}

.theme-preview-surface {
  min-width: 0;
  padding: .9em;
  border: 1px solid var(--border-color);
  border-radius: calc(var(--radius) + .25em);
  background: var(--bg-primary);
  color: var(--text-primary);
}
.theme-preview-surface > header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: .65em;
  margin-bottom: .7em;
}
.theme-preview-surface > header h3 {
  font-size: .86em;
  font-weight: 800;
}
.theme-preview-surface > header span {
  color: var(--accent);
  font-size: .68em;
  font-weight: 750;
}
.theme-preview-card {
  padding: .8em;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  box-shadow: 0 8px 22px color-mix(in srgb, var(--shadow-color) 18%, transparent);
}
.theme-preview-card + .theme-preview-card { margin-top: .65em; }
.theme-preview-card h4 {
  font-size: .8em;
  font-weight: 800;
}
.theme-preview-card p {
  margin-top: .25em;
  color: var(--text-muted);
  font-size: .68em;
  line-height: 1.5;
}
.theme-preview-actions,
.theme-preview-badges,
.theme-preview-personas {
  display: flex;
  flex-wrap: wrap;
  gap: .4em;
  margin-top: .65em;
}
.theme-preview-actions > * {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: .45em .7em;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-size: .7em;
  font-weight: 750;
}
.theme-preview-actions > :first-child {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-contrast);
}
.theme-preview-badges > * {
  padding: .25em .45em;
  border-radius: 999px;
  font-size: .64em;
  font-weight: 800;
}
.theme-preview-badges > :nth-child(1) {
  background: var(--success);
  color: var(--success-contrast);
}
.theme-preview-badges > :nth-child(2) {
  background: var(--warning);
  color: var(--warning-contrast);
}
.theme-preview-badges > :nth-child(3) {
  background: var(--info);
  color: var(--info-contrast);
}
.theme-preview-badges > :nth-child(4) {
  background: var(--danger);
  color: var(--danger-contrast);
}
.theme-preview-tier-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .35em;
  margin-top: .65em;
}
.theme-preview-tier-grid > * {
  display: grid;
  min-height: 44px;
  place-items: center;
  padding: .3em;
  border-radius: var(--radius);
  font-size: .62em;
  font-weight: 800;
  text-align: center;
}
.theme-preview-tier-grid > :nth-child(1) {
  background: var(--tier-low);
  color: var(--tier-low-contrast);
}
.theme-preview-tier-grid > :nth-child(2) {
  background: var(--tier-mid);
  color: var(--tier-mid-contrast);
}
.theme-preview-tier-grid > :nth-child(3) {
  background: var(--tier-high);
  color: var(--tier-high-contrast);
}
.theme-preview-tier-grid > :nth-child(4) {
  background: var(--tier-extreme);
  color: var(--tier-extreme-contrast);
}
.theme-preview-personas > * {
  min-height: 44px;
  padding: .45em .6em;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  background: var(--bg-secondary);
  font-size: .66em;
  font-weight: 800;
}
.theme-preview-personas > :nth-child(1) { color: var(--persona-a); }
.theme-preview-personas > :nth-child(2) { color: var(--persona-b); }
.theme-preview-personas > :nth-child(3) { color: var(--persona-c); }
.theme-preview-personas > :nth-child(4) { color: var(--persona-d); }

.theme-contrast-status {
  display: flex;
  align-items: flex-start;
  gap: .5rem;
  margin-top: .65rem;
  padding: .65rem .7rem;
  border: 1px solid color-mix(in srgb, var(--info) 55%, var(--border-color));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--info) 10%, var(--bg-secondary));
  color: var(--text-primary);
  font-size: .7rem;
  line-height: 1.5;
}
.theme-contrast-status::before {
  content: "ⓘ";
  flex: none;
  color: var(--info);
  font-weight: 850;
}
.theme-contrast-status.is-pass,
.theme-contrast-status[data-status="pass"] {
  border-color: color-mix(in srgb, var(--success) 55%, var(--border-color));
  background: color-mix(in srgb, var(--success) 10%, var(--bg-secondary));
}
.theme-contrast-status.is-pass::before,
.theme-contrast-status[data-status="pass"]::before {
  content: "✓";
  color: var(--success);
}
.theme-contrast-status.is-warning,
.theme-contrast-status.is-fail,
.theme-contrast-status[data-status="warning"],
.theme-contrast-status[data-status="fail"] {
  border-color: color-mix(in srgb, var(--warning) 60%, var(--border-color));
  background: color-mix(in srgb, var(--warning) 12%, var(--bg-secondary));
}
.theme-contrast-status.is-warning::before,
.theme-contrast-status.is-fail::before,
.theme-contrast-status[data-status="warning"]::before,
.theme-contrast-status[data-status="fail"]::before {
  content: "!";
  color: var(--warning);
}

.theme-import-review {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .9rem;
  padding: .8rem 1rem;
  border-top: 1px solid color-mix(in srgb, var(--info) 60%, var(--border-color));
  background: color-mix(in srgb, var(--info) 10%, var(--bg-secondary));
}
.theme-import-review > div:first-child {
  min-width: 0;
}
.theme-import-review h3 {
  font-size: .86rem;
  font-weight: 850;
}
.theme-import-review p {
  margin-top: .25rem;
  color: var(--text-muted);
  font-size: .7rem;
  line-height: 1.5;
}
.theme-import-review-actions {
  display: flex;
  flex: none;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: .5rem;
}

.theme-customizer-modal :where(button, input, select, textarea):focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}
.theme-customizer-modal :where(button, input:not([type="checkbox"]):not([type="radio"]), select, textarea) {
  min-height: 44px;
}
.theme-customizer-modal button {
  min-width: 44px;
}
.theme-customizer-modal .switch-control {
  min-height: 44px;
  align-items: center;
}
.theme-customizer-modal .switch-control i {
  height: 28px;
}

.tutorial-modal {
  overflow-y: auto;
  background: color-mix(in srgb, var(--overlay-color) 66%, transparent);
  backdrop-filter: blur(8px);
}
.tutorial-panel {
  padding: 0;
  overflow: hidden;
  border-color: color-mix(in srgb, var(--accent) 30%, var(--border-color));
  box-shadow: 0 24px 70px color-mix(in srgb, var(--shadow-color) 72%, transparent);
}
.tutorial-header,
.tutorial-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.25rem;
  background: var(--bg-secondary);
}
.tutorial-header {
  align-items: flex-start;
  border-bottom: 1px solid var(--border-color);
}
.tutorial-header h2 {
  margin-top: .2rem;
  font-size: 1.2rem;
  font-weight: 800;
}
.tutorial-header #tutorial-description {
  margin-top: .3rem;
  color: var(--text-muted);
  font-size: .78rem;
}
.tutorial-progress-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 1rem 1.25rem 0;
}
.tutorial-progress-track {
  flex: 1;
  height: .45rem;
  overflow: hidden;
  border-radius: 999px;
  background: var(--bg-elevated);
}
.tutorial-progress-track span {
  display: block;
  width: 25%;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width .2s ease;
}
#tutorial-step-counter {
  min-width: 2.6rem;
  color: var(--text-muted);
  font-size: .72rem;
  text-align: right;
}
.tutorial-step {
  display: grid;
  gap: .7rem;
  min-height: 280px;
  padding: 1.35rem 1.25rem 1.5rem;
}
.tutorial-step-icon {
  display: grid;
  place-items: center;
  width: 4rem;
  height: 4rem;
  border-radius: 1.25rem;
  background: color-mix(in srgb, var(--accent) 12%, var(--bg-elevated));
  font-size: 2rem;
}
.tutorial-step h3 {
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.35;
}
.tutorial-step > p:not(.eyebrow) {
  color: var(--text-muted);
  line-height: 1.7;
}
.tutorial-tip {
  display: grid;
  gap: .25rem;
  align-self: end;
  padding: .85rem;
  border: 1px solid color-mix(in srgb, var(--info) 32%, var(--border-color));
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--info) 8%, var(--bg-primary));
  font-size: .78rem;
  line-height: 1.55;
}
.tutorial-tip span {
  color: var(--text-muted);
}
.tutorial-actions {
  justify-content: flex-end;
  border-top: 1px solid var(--border-color);
}

@media (max-width: 900px) {
  .theme-customizer-panel {
    width: min(760px, 100%);
  }
  .theme-customizer-body {
    grid-template-columns: minmax(0, 1fr);
  }
  .theme-customizer-preview-column {
    position: static;
  }
}

@media (max-width: 520px) {
  .tutorial-modal {
    align-items: flex-end;
    padding: 0;
  }
  .tutorial-panel {
    width: 100%;
    max-height: 94vh;
    overflow-y: auto;
    border-radius: var(--radius) var(--radius) 0 0;
  }
  .tutorial-header {
    flex-direction: column;
  }
  .tutorial-header [data-tutorial-action="skip"] {
    align-self: flex-end;
  }
  .tutorial-step {
    min-height: 250px;
  }
  .tutorial-actions {
    padding-bottom: max(1rem, env(safe-area-inset-bottom));
  }
}

/* Tailwind의 hidden + md:flex 조합을 로컬 fallback보다 우선해 복원합니다. */
@media (min-width: 768px) {
  #sidebar-desktop.hidden {
    display: flex !important;
  }
}

@media (max-width: 520px) {
  .theme-customizer-modal {
    align-items: stretch;
    padding: 0;
  }
  .theme-customizer-panel {
    width: 100%;
    max-height: 100dvh;
    border-radius: 0;
  }
  .theme-customizer-header,
  .theme-customizer-panel > :first-child,
  .theme-customizer-footer,
  .theme-customizer-body,
  .theme-import-review {
    padding: .75rem;
  }
  .theme-customizer-header,
  .theme-customizer-panel > :first-child {
    padding-top: max(.75rem, env(safe-area-inset-top));
  }
  .theme-customizer-header,
  .theme-customizer-panel > :first-child,
  .theme-customizer-body,
  .theme-import-review,
  .theme-customizer-footer {
    padding-right: max(.75rem, env(safe-area-inset-right));
    padding-left: max(.75rem, env(safe-area-inset-left));
  }
  .theme-customizer-footer {
    padding-bottom: max(.75rem, env(safe-area-inset-bottom));
  }
  .theme-customizer-header,
  .theme-customizer-panel > :first-child {
    align-items: flex-start;
  }
  .theme-customizer-footer > * {
    flex: 1 1 100%;
  }
  .theme-import-review {
    align-items: stretch;
    flex-direction: column;
  }
  .theme-import-review-actions {
    flex-direction: column;
  }
  .theme-color-grid,
  .theme-preset-list {
    grid-template-columns: minmax(0, 1fr);
  }
  .theme-color-inputs {
    grid-template-columns: minmax(0, 1fr);
  }
  .theme-color-picker {
    width: 100%;
  }
  .theme-range-row {
    grid-template-columns: minmax(0, 1fr);
  }
  .theme-range-row input[type="range"] {
    grid-column: auto;
    grid-row: auto;
  }
  .theme-preset-toolbar {
    grid-template-columns: minmax(0, 1fr);
  }
  .theme-preview-tier-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

@media (max-width: 767px) {
  #toast-container {
    top: .75rem;
    right: .75rem;
    left: .75rem;
  }
  .toast { width: 100%; max-width: none; }
  .settings-grid { grid-template-columns: 1fr; }
  .settings-data { grid-column: auto; }
  .setting-row { grid-template-columns: minmax(0, 1fr) minmax(112px, 42%); }
  .settings-stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .scroll-to-top { bottom: calc(4.7rem + env(safe-area-inset-bottom)); }
  #install-banner { bottom: calc(4.7rem + env(safe-area-inset-bottom)) !important; }
  body:has(#install-banner:not(.hidden)) .scroll-to-top {
    bottom: calc(10rem + env(safe-area-inset-bottom));
  }
}

@media (max-width: 460px) {
  .setting-row:not(.setting-toggle-row) {
    grid-template-columns: 1fr;
    gap: .45rem;
  }
  .setting-row .field-input,
  .setting-input-unit { max-width: none; justify-self: stretch; }
  #command-palette-open kbd { display: none; }
}

/* ============================================================
   친구와 함께 공부하기 (features/friends.js)
   기존 학습 기능과 분리된 레이어이므로 클래스도 friend-* 로 따로 둡니다.
   ============================================================ */
.friends-panel { display: flex; flex-direction: column; gap: .85rem; }

.friends-panel-head {
  display: flex; justify-content: space-between; align-items: flex-start; gap: .75rem;
}

.friend-code-box {
  display: flex; align-items: center; gap: .6rem; flex-wrap: wrap;
  padding: .6rem .75rem; border-radius: .55rem;
  background: var(--bg-elevated); border: 1px solid var(--border-color);
}
.friend-code {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 1.05rem; font-weight: 700; letter-spacing: .18em;
  color: var(--accent);
}

.friend-add-form { display: flex; flex-direction: column; gap: .35rem; }
.friend-add-row { display: flex; gap: .5rem; }
.friend-add-row .field-input {
  flex: 1 1 auto; min-width: 0;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  letter-spacing: .12em;
}

.friend-section { display: flex; flex-direction: column; gap: .5rem; }
.friend-list { display: flex; flex-direction: column; gap: .4rem; margin: 0; padding: 0; list-style: none; }

.friend-row {
  display: flex; align-items: center; gap: .75rem; flex-wrap: wrap;
  padding: .55rem .7rem; border-radius: .5rem;
  background: var(--bg-elevated); border: 1px solid var(--border-color);
}
.friend-row-main { flex: 1 1 8rem; min-width: 0; }
.friend-row-main b { display: block; overflow-wrap: anywhere; }
.friend-row-main small { color: var(--text-muted); font-size: .72rem; }
.friend-row-stats {
  display: flex; gap: .6rem; font-size: .8rem;
  font-variant-numeric: tabular-nums;   /* 숫자가 바뀌어도 폭이 흔들리지 않게 */
  color: var(--text-muted); white-space: nowrap;
}
.friend-row-actions { display: flex; gap: .35rem; }

@media (max-width: 520px) {
  .friend-row { align-items: flex-start; }
  .friend-row-actions { width: 100%; justify-content: flex-end; }
}

/* ============================================================
   화면 꾸미기 — 기본 배경 패턴
   - 이미지 파일 없이 순수 CSS 그라데이션으로만 그립니다(용량·로딩 부담 0).
   - 패턴 색을 테마 변수(--text-primary/--accent/--info)에서 파생시켜,
     라이트/다크 전환과 사용자 지정 색상을 자동으로 따라갑니다.
   - 명도 대비를 해치지 않도록 농도를 매우 낮게 잡았습니다. 콘텐츠는 카드
     (--bg-elevated) 위에 올라가므로 본문 가독성은 패턴과 무관하게 유지됩니다.
   ============================================================ */
#app-shell {
  background-attachment: fixed;
}

/* 은은한 도트 — 차분해서 학술 모드에 어울립니다. */
body[data-bg-pattern="dots"] #app-shell {
  background-image: radial-gradient(
    circle,
    color-mix(in srgb, var(--text-primary) 9%, transparent) 1px,
    transparent 1px
  );
  background-size: 22px 22px;
}

/* 모눈 격자 — 노트 느낌. */
body[data-bg-pattern="grid"] #app-shell {
  background-image:
    linear-gradient(color-mix(in srgb, var(--text-primary) 6%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--text-primary) 6%, transparent) 1px, transparent 1px);
  background-size: 28px 28px, 28px 28px;
}

/* 사선 스트라이프 — 약간의 활기. */
body[data-bg-pattern="diagonal"] #app-shell {
  background-image: repeating-linear-gradient(
    45deg,
    color-mix(in srgb, var(--text-primary) 5%, transparent) 0 2px,
    transparent 2px 14px
  );
}

/* 부드러운 오로라 — 테마 포인트 색에서 자동 생성되는 그라데이션. */
body[data-bg-pattern="glow"] #app-shell {
  background-image:
    radial-gradient(60rem 40rem at 12% -12%,
      color-mix(in srgb, var(--accent) 18%, transparent), transparent 62%),
    radial-gradient(52rem 36rem at 96% 4%,
      color-mix(in srgb, var(--info) 15%, transparent), transparent 58%);
  background-repeat: no-repeat;
}

/* 고대비 모드는 배경 패턴이 대비를 떨어뜨리므로 항상 끕니다(접근성 우선). */
body.high-contrast #app-shell {
  background-image: none;
}

/* 설정 화면의 배경 미리보기 타일 — 실제 규칙과 같은 그림을 작게 보여줍니다. */
.bg-pattern-swatch {
  height: 3rem;
  border-radius: .5rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}
.bg-pattern-swatch[data-preview="dots"] {
  background-image: radial-gradient(
    circle, color-mix(in srgb, var(--text-primary) 9%, transparent) 1px, transparent 1px);
  background-size: 11px 11px;
}
.bg-pattern-swatch[data-preview="grid"] {
  background-image:
    linear-gradient(color-mix(in srgb, var(--text-primary) 6%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--text-primary) 6%, transparent) 1px, transparent 1px);
  background-size: 14px 14px, 14px 14px;
}
.bg-pattern-swatch[data-preview="diagonal"] {
  background-image: repeating-linear-gradient(
    45deg, color-mix(in srgb, var(--text-primary) 5%, transparent) 0 2px, transparent 2px 9px);
}
.bg-pattern-swatch[data-preview="glow"] {
  background-image:
    radial-gradient(8rem 5rem at 12% -12%, color-mix(in srgb, var(--accent) 30%, transparent), transparent 62%),
    radial-gradient(7rem 5rem at 96% 4%, color-mix(in srgb, var(--info) 26%, transparent), transparent 58%);
  background-repeat: no-repeat;
}

/* 튜토리얼 1단계: 학적 직접 선택 (기본값이 "이미 고른 것"처럼 보이지 않게 함) */
.tutorial-level-picker {
  display: flex; flex-wrap: wrap; gap: .5rem;
  justify-content: center; margin: .85rem 0 .35rem;
}
.tutorial-level-btn {
  padding: .5rem .9rem; border-radius: var(--radius);
  border: 2px solid var(--border-color);
  background: var(--bg-elevated); color: var(--text-primary);
  font-size: .875rem; font-weight: 600; cursor: pointer;
}
.tutorial-level-btn:hover { border-color: var(--accent); }
.tutorial-level-btn.active {
  border-color: var(--accent); background: var(--accent); color: var(--accent-contrast);
}
.tutorial-level-hint {
  font-size: .78rem; color: var(--text-muted); text-align: center; margin-bottom: .5rem;
}

/* ============================================================
   접근성 — 색약 친화 팔레트
   채점 결과(정답/오답), 난이도 배지, 서약 진행 등이 초록·빨강에 의존해서
   적록색약 사용자는 색만으로 상태를 구분할 수 없습니다. 성공/위험 색을
   명도까지 벌어지는 조합으로 바꿔 끼웁니다(파랑↔주황 계열).
   ※ 색만 바꾸는 것이므로 아이콘·텍스트 라벨은 그대로 함께 보입니다.
   ============================================================ */
body[data-color-vision="redGreen"] {
  --success:          #0284c7;  /* sky-600 — 초록 대신 파랑 */
  --success-contrast: #ffffff;
  --danger:           #ea580c;  /* orange-600 — 빨강 대신 주황 */
  --danger-contrast:  #ffffff;
  --tier-low:         #0ea5e9;
  --tier-high:        #f97316;
  --tier-extreme:     #7c2d12;
}
body[data-color-vision="blueYellow"] {
  --success:          #15803d;  /* green-700 — 청황색약에서는 초록이 잘 보임 */
  --success-contrast: #ffffff;
  --danger:           #be123c;  /* rose-700 */
  --danger-contrast:  #ffffff;
  --tier-low:         #16a34a;
  --tier-high:        #e11d48;
  --tier-extreme:     #881337;
}

/* 설정 - 접기식 부가 정보(앱 버전·오픈소스 고지) */
.settings-details { margin-top: .75rem; }
.settings-details > summary {
  cursor: pointer; font-size: .8rem; font-weight: 600;
  color: var(--text-muted); padding: .35rem 0;
}
.settings-details[open] > summary { color: var(--text-primary); }