:root {
  --bg: #0f1117;
  /* 글래스 표면 — 강한 투명(빡세게). 알파를 올리면 더 불투명해진다(취향대로 조절). */
  --surface: rgba(24, 27, 36, 0.5);
  --surface-2: rgba(31, 35, 48, 0.46);
  --border: rgba(255, 255, 255, 0.1);
  --text: #e6e9f0;
  --muted: #9aa3b5;
  --accent: #ff8a3d;
  --accent-soft: #2a2018;
  --accent-theory: #7aa2ff;
  --accent-theory-soft: #19203a;
  --correct: #3ddc84;
  --correct-soft: #14301f;
  --wrong: #ff6b6b;
  --wrong-soft: #321a1c;
  --radius: 12px;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, "Pretendard", "Apple SD Gothic Neo",
    "Noto Sans KR", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  /* 솔리드 폴백. 컴포지터로 창 자체를 투명하게 쓰는 환경(Electron/kiosk 등)이라면
     이 한 줄을 `transparent` 로 바꾸면 빈 배경으로 데스크톱이 비친다.
     단, 일반 파이어폭스/크롬 웹 콘텐츠는 데스크톱까지 투명하게 못 뚫는다. */
  background: #0b0d13;
}

body {
  /* 페이지 배경 = 은은한 다크 그라데이션(글래스 표면이 비칠 backdrop).
     "강한 투명"은 표면을 글래스(backdrop-blur)로 처리해 이 위로 표현한다. */
  background:
    radial-gradient(1100px 560px at 18% -8%, rgba(255, 138, 61, 0.13), transparent 60%),
    radial-gradient(900px 520px at 102% 4%, rgba(80, 140, 255, 0.1), transparent 55%),
    linear-gradient(165deg, #11141c 0%, #0b0d13 62%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

/* 글래스 표면 — 페이지 배경을 강하게 비추는 frosted 효과 (Firefox 103+ · Chrome 76+ 지원). */
.card,
.lesson-card,
.choice,
.hero__progress,
.feedback,
.chat-panel,
.chat-bubble,
.chat-composer__input {
  backdrop-filter: blur(12px) saturate(130%);
  -webkit-backdrop-filter: blur(12px) saturate(130%);
}

.chat-panel {
  backdrop-filter: blur(22px) saturate(140%);
  -webkit-backdrop-filter: blur(22px) saturate(140%);
}

/* ── Home ───────────────────────────────────────────── */

.hero {
  text-align: center;
  margin-bottom: 40px;
}

.hero__title {
  font-size: 44px;
  margin: 0;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent), #ffd6a8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  color: var(--muted);
  margin: 8px 0 16px;
  font-size: 16px;
}

.hero__progress {
  display: inline-block;
  font-size: 13px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 14px;
}

.unit {
  margin-bottom: 28px;
}

.unit__title {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 12px;
  font-weight: 600;
}

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

.lesson-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--text);
  font-size: 17px;
  font-family: var(--sans);
  cursor: pointer;
  transition: border-color 0.15s, transform 0.05s, background 0.15s;
}

.lesson-card:hover {
  border-color: var(--accent);
  background: var(--surface-2);
}

.lesson-card:active {
  transform: translateY(1px);
}

.lesson-card--done {
  border-color: var(--correct);
}

.lesson-card__badge {
  color: var(--correct);
  font-weight: 700;
}

/* ── Tracks (실용 / FP 이론) ─────────────────────────── */

.track {
  margin-bottom: 44px;
}

.track__header {
  margin-bottom: 18px;
}

.track__title {
  font-size: 22px;
  margin: 0;
  letter-spacing: -0.01em;
  color: var(--text);
}

.track__subtitle {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--muted);
}

/* 이론 트랙: 좌측 액센트 바 + 파랑-보라 톤으로 실용 트랙과 시각적 분리 */
.track--theory {
  position: relative;
  padding: 20px 0 4px 22px;
  border-left: 2px solid color-mix(in oklab, var(--accent-theory) 55%, transparent);
}

.track--theory .track__title {
  background: linear-gradient(135deg, var(--accent-theory), #cdd9ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.track--theory .lesson-card:hover {
  border-color: var(--accent-theory);
  background: var(--surface-2);
}

.level-group {
  margin-bottom: 26px;
}

.level-group__title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--accent-theory);
  margin: 0 0 14px;
  padding: 4px 12px;
  display: inline-block;
  background: var(--accent-theory-soft);
  border: 1px solid color-mix(in oklab, var(--accent-theory) 30%, transparent);
  border-radius: 999px;
  backdrop-filter: blur(12px) saturate(130%);
  -webkit-backdrop-filter: blur(12px) saturate(130%);
}

.level-group .unit__title {
  font-size: 13px;
}

/* ── Lesson ─────────────────────────────────────────── */

.lesson-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.link-back {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 0;
  font-family: var(--sans);
}

.link-back:hover {
  color: var(--text);
}

.lesson-header__title {
  font-weight: 600;
  flex: 1;
}

.progress {
  flex: 0 0 120px;
  height: 6px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  animation: rise 0.2s ease;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.prose p {
  margin: 0 0 14px;
  font-size: 16.5px;
}

.prose p:last-child {
  margin-bottom: 0;
}

/* ── 마크다운 렌더러 (ui/markdown) ───────────────────────── */

.md > :first-child {
  margin-top: 0;
}

.md > :last-child {
  margin-bottom: 0;
}

.md p {
  margin: 0 0 14px;
  font-size: 16.5px;
}

.md .code {
  margin: 0 0 16px;
}

.md-h {
  margin: 22px 0 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.md-h1 {
  font-size: 20px;
}

.md h4.md-h {
  font-size: 17px;
}

.md-ul {
  margin: 0 0 14px;
  padding-left: 22px;
}

.md-ul li {
  margin: 4px 0;
  font-size: 16px;
}

/* 인라인 코드 — prose·prompt·feedback 공용. choices(이미 mono)에선 배경만 약하게. */
.md-icode {
  font-family: var(--mono);
  font-size: 0.88em;
  background: #0b0d13;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
  color: #ffd6a8;
}

.choice .md-icode,
.exercise__prompt .md-icode {
  background: rgba(255, 138, 61, 0.1);
}

.exercise__prompt {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
}

.code {
  background: rgba(7, 9, 14, 0.55);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0 0 20px;
  backdrop-filter: blur(12px) saturate(130%);
  -webkit-backdrop-filter: blur(12px) saturate(130%);
}

.code code {
  font-family: var(--mono);
  font-size: 14.5px;
  color: #d6deeb;
  white-space: pre;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.choice {
  text-align: left;
  background: var(--surface-2);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  color: var(--text);
  font-size: 16px;
  font-family: var(--mono);
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}

.choice:hover:not(:disabled) {
  border-color: var(--accent);
}

.choice--selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.choice--correct {
  border-color: var(--correct);
  background: var(--correct-soft);
}

.choice--wrong {
  border-color: var(--wrong);
  background: var(--wrong-soft);
}

.choice:disabled {
  cursor: default;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 13px 28px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--sans);
  transition: opacity 0.12s, transform 0.05s;
}

.btn--primary {
  background: var(--accent);
  color: #1a1206;
}

.btn--primary:hover:not(:disabled) {
  opacity: 0.9;
}

.btn--primary:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.feedback {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border-radius: 10px;
  padding: 14px 16px;
  margin-bottom: 20px;
  font-size: 15px;
}

.feedback--correct {
  background: var(--correct-soft);
  border: 1px solid var(--correct);
}

.feedback--wrong {
  background: var(--wrong-soft);
  border: 1px solid var(--wrong);
}

.feedback__mark {
  flex: 0 0 auto;
  font-weight: 700;
  font-size: 13px;
  padding: 2px 8px;
  border-radius: 6px;
}

.feedback--correct .feedback__mark {
  background: var(--correct);
  color: #06150c;
}

.feedback--wrong .feedback__mark {
  background: var(--wrong);
  color: #2a0c0c;
}

.feedback__text {
  flex: 1;
}

.card--done {
  text-align: center;
}

.done__title {
  font-size: 28px;
  margin: 0 0 8px;
}

/* ── 코딩 어시스턴트 사이드바 ────────────────────────── */

/* 셸은 레이아웃에 영향 주지 않는다 — #app 의 760px 중앙정렬을 그대로 보존하고,
   패널/FAB 는 position:fixed 로 화면에 오버레이된다. */
.app-shell {
  display: contents;
}

/* 접힘 상태: 우하단 플로팅 버튼 */
.chat-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--accent);
  color: #1a1206;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  z-index: 50;
  transition: transform 0.08s ease;
}

.chat-fab:hover {
  transform: translateY(-2px);
}

.chat-fab:active {
  transform: translateY(0);
}

/* 펼침 상태: 우측 고정 패널 */
.chat-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(420px, 92vw);
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-left: 1px solid var(--border);
  box-shadow: -12px 0 32px rgba(0, 0, 0, 0.35);
  z-index: 50;
  animation: slide-in 0.18s ease;
}

@keyframes slide-in {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(0);
  }
}

.chat-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex: 0 0 auto;
}

.chat-panel__title {
  font-weight: 600;
  font-size: 15px;
}

.chat-panel__actions {
  display: flex;
  gap: 4px;
}

.chat-panel__icon-btn {
  background: none;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 15px;
  padding: 4px 9px;
  border-radius: 8px;
  font-family: var(--sans);
}

.chat-panel__icon-btn:hover {
  color: var(--text);
  background: var(--surface-2);
}

.chat-panel__log {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-hint {
  color: var(--muted);
  font-size: 14px;
  text-align: center;
  margin: auto 0;
  padding: 24px 12px;
}

.chat-bubble {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 14.5px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
}

.chat-bubble--user {
  align-self: flex-end;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
}

.chat-bubble--assistant {
  align-self: flex-start;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.chat-bubble--system {
  align-self: center;
  background: var(--wrong-soft);
  border: 1px solid var(--wrong);
  font-size: 13.5px;
  text-align: center;
}

.chat-bubble--typing {
  color: var(--muted);
  letter-spacing: 3px;
}

.chat-composer {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--border);
  flex: 0 0 auto;
}

.chat-composer__input {
  flex: 1;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 11px 14px;
  color: var(--text);
  font-family: var(--sans);
  font-size: 14.5px;
  min-width: 0;
}

.chat-composer__input:focus {
  outline: none;
  border-color: var(--accent);
}

.chat-composer__input:disabled {
  opacity: 0.5;
}

.chat-composer__send {
  background: var(--accent);
  color: #1a1206;
  border: none;
  border-radius: 10px;
  padding: 0 18px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  font-family: var(--sans);
  flex: 0 0 auto;
}

.chat-composer__send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ── 언어 토글 바 (상단 상주, 전 라우트) ───────────────── */

.lang-bar {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
}

/* ── 상단 바 (내비 + 언어 + 인증) ───────────────────────── */

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.top-bar__nav {
  display: flex;
  gap: 6px;
}

.top-bar__right {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.nav-btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}

.nav-btn:hover {
  color: var(--text);
}

.nav-btn--active {
  color: var(--text);
  background: var(--surface-2);
  border-color: var(--border);
}

/* 구글 로그인 버튼 슬롯 — GIS 가 iframe 을 주입한다(Lustre vdom 자식은 비움). */
.gsi-slot {
  min-height: 32px;
  display: flex;
  align-items: center;
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-chip__avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--border);
}

.user-chip__name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.logout-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  cursor: pointer;
}

.logout-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

/* ── 대시보드 ───────────────────────────────────────────── */

.dash-header {
  margin-bottom: 24px;
}

.dash-title {
  font-size: 30px;
  margin: 0;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent), #ffd6a8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.dash-subtitle {
  color: var(--muted);
  margin: 6px 0 0;
  font-size: 14px;
}

.dash-grid {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.dash-card {
  padding: 22px;
}

.dash-card__title {
  margin: 0 0 16px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.dash-empty {
  padding: 40px;
  text-align: center;
  color: var(--muted);
}

.chart-label {
  margin: 22px 0 10px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* 통계 숫자 행 */
.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.stat {
  flex: 1 1 0;
  min-width: 110px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat__value {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--mono);
}

.stat__label {
  font-size: 12px;
  color: var(--muted);
}

/* 막대 차트 (최근 14일) */
.bars {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 90px;
}

.bars__col {
  flex: 1 1 0;
  height: 100%;
  display: flex;
  align-items: flex-end;
}

.bars__bar {
  width: 100%;
  min-height: 2px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, var(--accent), #c9692a);
}

.bars__bar--empty {
  background: var(--surface-2);
  min-height: 2px;
}

/* 히트맵 (최근 12주, 날짜순 그리드) */
.heatmap {
  display: grid;
  grid-template-columns: repeat(14, 1fr);
  gap: 4px;
}

.heatmap__cell {
  aspect-ratio: 1 / 1;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.heatmap__cell--l0 { background: rgba(255, 255, 255, 0.03); }
.heatmap__cell--l1 { background: rgba(255, 138, 61, 0.30); }
.heatmap__cell--l2 { background: rgba(255, 138, 61, 0.52); }
.heatmap__cell--l3 { background: rgba(255, 138, 61, 0.74); }
.heatmap__cell--l4 { background: var(--accent); }

/* 요일 막대 */
.weekbars {
  display: flex;
  gap: 8px;
  height: 80px;
}

.weekbars__col {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.weekbars__track {
  flex: 1;
  width: 60%;
  display: flex;
  align-items: flex-end;
}

.weekbars__fill {
  width: 100%;
  min-height: 2px;
  border-radius: 3px 3px 0 0;
  background: linear-gradient(180deg, var(--accent-theory), #4a6bcc);
}

.weekbars__label {
  font-size: 11px;
  color: var(--muted);
}

/* 커버리지 바 */
.dash-card--wide {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cov-row__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 6px;
}

.cov-row__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.cov-row__pct {
  font-size: 12px;
  color: var(--muted);
  font-family: var(--mono);
}

.cov-bar {
  height: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.cov-bar__fill {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #ffd6a8);
  transition: width 0.4s ease;
}

.track--theory .cov-bar__fill {
  background: linear-gradient(90deg, var(--accent-theory), #b9ccff);
}

.unit-coverage {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 6px;
  margin-top: 8px;
}

.unit-cov {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 12px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
}

.unit-cov__name {
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.unit-cov__count {
  color: var(--text);
  font-family: var(--mono);
  flex: 0 0 auto;
}

.unit-cov--complete {
  border-color: var(--correct);
}

.unit-cov--complete .unit-cov__count {
  color: var(--correct);
}

.lang-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  backdrop-filter: blur(12px) saturate(130%);
  -webkit-backdrop-filter: blur(12px) saturate(130%);
}

.lang-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.lang-btn--active {
  color: var(--bg);
  background: linear-gradient(135deg, var(--accent), #ffd6a8);
  border-color: transparent;
}