/* 나란히 — 디자인 시스템 (Apple HIG 기준)
   원칙: 콘텐츠가 주인공, 크롬은 사라질 것. 색은 블루 하나, 상태색 셋. */
:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --text-2: #6e6e73;
  --text-3: #aeaeb2;
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --blue-soft: #eaf3fe;
  --green: #34c759;
  --green-soft: #e8f9ee;
  --orange: #ff9500;
  --orange-soft: #fff3e0;
  --red: #ff3b30;
  --red-soft: #ffefee;
  --line: rgba(0, 0, 0, 0.08);
  --radius: 18px;
  --shadow-card: 0 0 0 0.5px rgba(0,0,0,.03), 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.05);
  --shadow-hover: 0 0 0 0.5px rgba(0,0,0,.03), 0 2px 6px rgba(0,0,0,.05), 0 14px 36px rgba(0,0,0,.09);
  --shadow-float: 0 0 0 0.5px rgba(0,0,0,.04), 0 12px 40px rgba(0,0,0,.16);
  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", sans-serif;
  background: var(--bg); color: var(--text);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  text-rendering: optimizeLegibility;
}
::selection { background: rgba(0, 113, 227, 0.18); }

/* ---- 상단바 ---- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 12px;
  padding: 13px 22px;
  background: rgba(245, 245, 247, 0.82);
  backdrop-filter: saturate(1.8) blur(20px); -webkit-backdrop-filter: saturate(1.8) blur(20px);
  border-bottom: 0.5px solid var(--line);
}
.topbar .logo {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 17px; letter-spacing: -0.4px; cursor: pointer;
}
.topbar .logo img { width: 26px; height: 26px; border-radius: 7px; }
.topbar .spacer { flex: 1; }
.topbar .sub { color: var(--text-2); font-size: 14px; }

.back-btn {
  border: none; background: none; color: var(--blue);
  font-size: 16px; font-weight: 500; cursor: pointer; padding: 6px 4px;
  font-family: inherit; white-space: nowrap; flex-shrink: 0;
  transition: opacity 0.15s;
}
.back-btn:active { opacity: 0.5; }

/* ---- 카드 ---- */
.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow-card); padding: 20px;
}
.card.tappable { cursor: pointer; transition: transform 0.25s var(--ease-spring), box-shadow 0.25s; }
@media (hover: hover) {
  .card.tappable:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
}
.card.tappable:active { transform: scale(0.985); }

/* ---- 버튼 ---- */
.btn {
  border: none; border-radius: 980px; cursor: pointer;
  font-family: inherit; font-size: 15px; font-weight: 600;
  padding: 10px 22px;
  transition: transform 0.15s var(--ease-spring), background 0.15s, opacity 0.15s;
}
.btn:active { transform: scale(0.96); }
.btn:focus-visible { outline: 3px solid rgba(0,113,227,.35); outline-offset: 2px; }
.btn-primary { background: var(--blue); color: #fff; }
@media (hover: hover) { .btn-primary:hover { background: var(--blue-hover); } }
.btn-primary:disabled { opacity: 0.4; cursor: default; }
.btn-ghost { background: rgba(0, 0, 0, 0.05); color: var(--text); }
@media (hover: hover) { .btn-ghost:hover { background: rgba(0, 0, 0, 0.08); } }
.btn-quiet { background: none; color: var(--text-2); font-weight: 500; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  border-radius: 980px; padding: 4px 12px;
  font-size: 12.5px; font-weight: 600;
  background: var(--blue-soft); color: var(--blue);
  white-space: nowrap; max-width: 180px; overflow: hidden; text-overflow: ellipsis;
}
.chip.gray { background: rgba(0, 0, 0, 0.05); color: var(--text-2); }
.chip.warn { background: var(--orange-soft); color: var(--orange); }

/* ---- 숙련도 게이지 ---- */
.gauge { display: flex; align-items: center; gap: 8px; }
.gauge .bar {
  flex: 1; height: 5px; border-radius: 3px;
  background: rgba(0, 0, 0, 0.06); overflow: hidden;
}
.gauge .fill {
  height: 100%; border-radius: 3px;
  transition: width 0.9s var(--ease-spring);
}
.gauge .pct { font-size: 12.5px; font-weight: 600; color: var(--text-2); min-width: 36px; text-align: right; font-variant-numeric: tabular-nums; }
.m-high { background: var(--green); }
.m-mid { background: var(--orange); }
.m-low { background: var(--red); }

/* ---- 난이도 점 ---- */
.dots { display: inline-flex; gap: 3px; flex-shrink: 0; }
.dots i { width: 5px; height: 5px; border-radius: 50%; background: rgba(0,0,0,0.13); }
.dots i.on { background: var(--orange); }

/* ---- 상태 아이콘 (✅❌ 이모지 대체) ---- */
.sf-ic {
  display: inline-grid; place-items: center; flex-shrink: 0;
  width: 22px; height: 22px; border-radius: 50%;
  font-size: 12px; font-weight: 800;
}
.sf-ic.ok { background: var(--green-soft); color: var(--green); }
.sf-ic.bad { background: var(--red-soft); color: var(--red); }

/* ---- 페이지 공통 ---- */
.page { max-width: 1040px; margin: 0 auto; padding: 26px 22px 80px; animation: page-in .4s var(--ease-spring); }
@keyframes page-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.section-title { font-size: 21px; font-weight: 700; letter-spacing: -0.4px; margin: 36px 0 14px; }
.section-title:first-child { margin-top: 6px; }
.section-title .count { color: var(--text-3); font-weight: 600; font-size: 15px; margin-left: 4px; }
.muted { color: var(--text-2); font-size: 14px; }

/* ---- 애니메이션 ---- */
@keyframes breathe { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.live-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  background: var(--green); animation: breathe 2.4s ease-in-out infinite;
}
@keyframes slide-up {
  from { transform: translateY(28px) scale(.98); opacity: 0; }
  to { transform: none; opacity: 1; }
}
@keyframes slide-in-right {
  from { transform: translateX(48px); opacity: 0; }
  to { transform: none; opacity: 1; }
}
.katex { font-size: 1.05em; }

/* ---- 스크롤바 (데스크톱) ---- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,.14); border-radius: 5px; border: 3px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-track { background: transparent; }

/* ---- 나란히 튜터 캐릭터 ---- */
.tutor-root { position: fixed; right: 14px; bottom: 92px; z-index: 95;
  display: flex; align-items: flex-end; gap: 9px; pointer-events: none; }
.tutor-char { pointer-events: auto; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.tutor-svg { display: block; animation: tutor-bob 3.4s ease-in-out infinite;
  filter: drop-shadow(0 4px 10px rgba(10,132,255,.25)); transition: transform .4s var(--ease-spring); }
@keyframes tutor-bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-4px); } }
.tutor-char:active .tutor-svg { transform: scale(.92); }

.tutor-svg .pupils { transition: transform .25s ease-out; }
.tutor-svg .lid { opacity: 0; transition: opacity .07s; }
.blink .tutor-svg .lid { opacity: 1; }
.tutor-svg .happy-eyes, .tutor-svg .mouth.open, .tutor-svg .zzz { display: none; }

.m-think .tutor-svg { transform: rotate(-7deg); }
.m-think .tutor-svg .pupils { transform: translate(0, -2.5px) !important; }
.m-happy .tutor-svg { animation: tutor-hop .7s var(--ease-spring); }
.m-happy .tutor-svg .happy-eyes { display: block; }
.m-happy .tutor-svg .eye-g > circle, .m-happy .tutor-svg .pupils { display: none; }
.m-sleep .tutor-svg { animation-duration: 5.5s; filter: drop-shadow(0 4px 10px rgba(0,0,0,.12)) grayscale(.35); }
.m-sleep .tutor-svg .lid { opacity: 1; }
.m-sleep .tutor-svg .zzz { display: block; }
.m-sleep .tutor-svg .z1 { animation: zzz-float 2.6s ease-in-out infinite; }
.m-sleep .tutor-svg .z2 { animation: zzz-float 2.6s ease-in-out infinite 1.3s; }
@keyframes zzz-float { 0%,100% { opacity: 0; transform: translateY(2px); } 50% { opacity: 1; transform: translateY(-2px); } }
.tutor-svg .mouth.open { transform-origin: 50px 72px; }
.talk .tutor-svg .mouth.open { display: block; animation: talk-mouth .28s ease-in-out infinite; }
.talk .tutor-svg .mouth.smile { display: none; }
@keyframes talk-mouth { 0%,100% { transform: scaleY(1); } 50% { transform: scaleY(.45); } }
.hop .tutor-svg { animation: tutor-hop .6s var(--ease-spring); }
@keyframes tutor-hop { 0% { transform: translateY(0); } 35% { transform: translateY(-14px) rotate(-3deg); }
  65% { transform: translateY(0); } 82% { transform: translateY(-5px); } 100% { transform: translateY(0); } }

.tutor-bubble { pointer-events: auto; max-width: 310px; min-width: 0;
  background: rgba(255,255,255,.94); backdrop-filter: saturate(1.8) blur(20px); -webkit-backdrop-filter: saturate(1.8) blur(20px);
  border-radius: 18px 18px 4px 18px; box-shadow: var(--shadow-float); padding: 13px 16px;
  opacity: 0; transform: translateY(8px) scale(.92); transform-origin: bottom right;
  transition: opacity .3s, transform .35s var(--ease-spring); visibility: hidden; }
.tutor-bubble.show { opacity: 1; transform: none; visibility: visible; }
.tutor-bubble .bh { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.tutor-bubble .nm { font-size: 11.5px; font-weight: 800; color: var(--blue); letter-spacing: .2px; }
.tutor-bubble .lv-dots { display: inline-flex; gap: 3px; }
.tutor-bubble .lv-dots i { width: 5px; height: 5px; border-radius: 50%; background: rgba(0,0,0,.12); }
.tutor-bubble .lv-dots i.on { background: var(--orange); }
.tutor-bubble .bs { font-size: 12px; color: var(--text-2); margin-bottom: 4px; }
.tutor-bubble .bt { font-size: 14.5px; line-height: 1.55; min-height: 1.2em; word-break: keep-all; }
.tutor-bubble .bt.mut { font-size: 13.5px; color: var(--text-2); }
.tutor-bubble .ba { display: flex; gap: 6px; justify-content: flex-end; margin-top: 10px; }
.tutor-bubble .ba .btn { font-size: 13px; padding: 7px 14px; }

@media (max-width: 640px) {
  .tutor-root { bottom: 118px; right: 10px; }
  .tutor-svg { width: 56px; height: 62px; }
  .tutor-bubble { max-width: calc(100vw - 104px); }
}