/* ============================================================================
   K-edu 케이배틀 — 공용 스타일 (host / play 공유)
   케이플 게임쇼 톤(딥 인디고 + 비비드) 승계. ⛔ kple.css 는 안 건드린다.
   레이스 모드 스타일은 kb-mode-race.js 가 <style> 로 스스로 주입(모드 자기완결).
   ============================================================================ */
:root {
  --kb-ink: #15162e;
  --kb-ink2: #1f2147;
  --kb-paper: #fbfbff;
  --kb-yellow: #ffd23f;
  --kb-coral: #ff5d5d;
  --kb-mint: #2dd4bf;
  --kb-sky: #38bdf8;
  --kb-dim: rgba(255,255,255,.55);
  --kb-c0: #ff5d5d; --kb-c1: #38bdf8; --kb-c2: #ffd23f; --kb-c3: #2dd4bf;
  --kb-font: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo',
             'Malgun Gothic', 'Segoe UI', sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--kb-font);
  background:
    radial-gradient(1200px 600px at 80% -10%, #2b2d63 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 110%, #3a1d4d 0%, transparent 55%),
    var(--kb-ink);
  color: var(--kb-paper);
  -webkit-font-smoothing: antialiased;
}
.kb-app { max-width: 1100px; margin: 0 auto; padding: 24px; min-height: 100vh; }
.kb-phone { max-width: 520px; margin: 0 auto; padding: 18px 16px 40px; min-height: 100vh; }

/* ---- 호스트 상단 ---- */
.kb-host-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.kb-code { font-weight: 900; font-size: clamp(30px, 5vw, 52px); letter-spacing: .14em; color: var(--kb-yellow); }
.kb-qpos { color: var(--kb-dim); font-weight: 800; font-size: 20px; }
.kb-join-url { color: var(--kb-dim); font-weight: 700; font-size: 15px; }

/* ---- 무대 ---- */
.kb-stage { text-align: center; padding: 10px 0; }
.kb-big { font-weight: 900; font-size: clamp(34px, 6vw, 68px); margin: 14px 0; }
.kb-host-q { font-weight: 900; font-size: clamp(26px, 4vw, 46px); margin: 10px 0 22px; line-height: 1.35; }
.kb-resp-count { color: var(--kb-dim); font-weight: 800; font-size: 22px; margin-bottom: 20px; }
.kb-roster { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin: 20px 0 26px; min-height: 44px; }
.kb-chip { background: var(--kb-ink2); border: 2px solid rgba(255,255,255,.1); padding: 9px 16px;
  border-radius: 999px; font-weight: 800; font-size: 18px; animation: kbPop .25s ease; }
.kb-top1 { font-weight: 900; font-size: clamp(28px, 5vw, 52px); color: var(--kb-yellow); margin-top: 10px; }
.kb-btn {
  font-family: inherit; font-weight: 900; font-size: 20px; padding: 15px 34px; border: 0;
  border-radius: 16px; background: var(--kb-yellow); color: #2a2200; cursor: pointer;
  box-shadow: 0 6px 0 rgba(0,0,0,.22); transition: transform .1s ease;
}
.kb-btn:hover { transform: translateY(-1px); }
.kb-btn:active { transform: translateY(3px); box-shadow: 0 3px 0 rgba(0,0,0,.22); }
.kb-btn:disabled { opacity: .4; cursor: not-allowed; box-shadow: none; }

/* ---- 문제 (참가자 폰) ---- */
.kb-prompt { margin-bottom: 18px; }
.kb-prompt-img { max-width: 100%; border-radius: 14px; margin-bottom: 12px; }
.kb-prompt-text { font-weight: 900; font-size: clamp(20px, 5vw, 28px); line-height: 1.4; }
.kb-choices { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.kb-choice {
  font-family: inherit; font-weight: 900; font-size: 22px; min-height: 96px; padding: 14px;
  border: 0; border-radius: 18px; color: #16182f; cursor: pointer;
  box-shadow: 0 5px 0 rgba(0,0,0,.25); transition: transform .08s ease;
}
.kb-choice:nth-child(1) { background: var(--kb-c0); }
.kb-choice:nth-child(2) { background: var(--kb-c1); }
.kb-choice:nth-child(3) { background: var(--kb-c2); }
.kb-choice:nth-child(4) { background: var(--kb-c3); }
.kb-choice:active { transform: translateY(3px); box-shadow: 0 2px 0 rgba(0,0,0,.25); }
.kb-choice.kb-picked { outline: 4px solid #fff; }
.kb-choice:disabled { opacity: .45; }

.kb-ox { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.kb-ox-btn { font-family: inherit; font-weight: 900; font-size: 56px; min-height: 160px; border: 0;
  border-radius: 22px; color: #16182f; cursor: pointer; box-shadow: 0 6px 0 rgba(0,0,0,.25); }
.kb-ox-btn.kb-o { background: var(--kb-mint); }
.kb-ox-btn.kb-x { background: var(--kb-coral); }
.kb-ox-btn.kb-picked { outline: 4px solid #fff; }
.kb-ox-btn:disabled { opacity: .45; }

.kb-num-display { background: var(--kb-ink2); border: 2px solid rgba(255,255,255,.1);
  border-radius: 14px; padding: 16px; font-weight: 900; font-size: 38px; text-align: right;
  letter-spacing: .05em; margin-bottom: 14px; min-height: 72px; }
.kb-numpad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.kb-key { font-family: inherit; font-weight: 900; font-size: 26px; min-height: 64px; border: 0;
  border-radius: 14px; background: rgba(255,255,255,.1); color: var(--kb-paper); cursor: pointer; }
.kb-key:active { background: rgba(255,255,255,.2); }
.kb-key-del { background: rgba(255,93,93,.28); }
.kb-key-blank { visibility: hidden; }
.kb-key:disabled { opacity: .35; }

.kb-order-slots { display: flex; flex-wrap: wrap; gap: 10px; min-height: 68px; padding: 10px;
  border: 2px dashed rgba(255,255,255,.18); border-radius: 14px; margin-bottom: 14px; }
.kb-order-slot { background: var(--kb-yellow); color: #2a2200; font-weight: 900; font-size: 20px;
  padding: 12px 18px; border: 0; border-radius: 12px; cursor: pointer; }
.kb-order-pool { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.kb-order-item { background: rgba(255,255,255,.12); color: var(--kb-paper); font-family: inherit;
  font-weight: 900; font-size: 20px; padding: 14px 20px; border: 0; border-radius: 12px; cursor: pointer; }
.kb-order-item:disabled { opacity: .3; }

.kb-confirm { width: 100%; font-family: inherit; font-weight: 900; font-size: 22px; padding: 16px;
  border: 0; border-radius: 16px; background: var(--kb-sky); color: #06263a; cursor: pointer;
  margin-top: 14px; box-shadow: 0 5px 0 rgba(0,0,0,.22); }
.kb-confirm:disabled { opacity: .4; box-shadow: none; }
.kb-dim { color: var(--kb-dim); font-weight: 700; font-size: 14px; margin-top: 10px; text-align: center; }
.kb-error { color: var(--kb-coral); font-weight: 800; padding: 20px; text-align: center; }

/* ---- 결과 (참가자 폰) — 본인 것만 (KB-2) ---- */
.kb-wait { text-align: center; padding: 60px 20px; font-weight: 800; font-size: 22px; color: var(--kb-dim); }
.kb-my-result { text-align: center; padding: 44px 20px; border-radius: 22px; animation: kbPop .3s ease; }
.kb-my-result.kb-good { background: rgba(45,212,191,.16); border: 2px solid rgba(45,212,191,.5); }
.kb-my-result.kb-soft { background: rgba(255,255,255,.07); border: 2px solid rgba(255,255,255,.14); }
.kb-my-result.kb-final { background: rgba(255,210,63,.14); border: 2px solid rgba(255,210,63,.5); }
.kb-mark { font-weight: 900; font-size: 34px; margin-bottom: 12px; }
.kb-gained { font-weight: 900; font-size: 44px; color: var(--kb-yellow); }
.kb-x2 { font-size: 24px; color: var(--kb-mint); }
.kb-streak { margin-top: 12px; font-weight: 900; font-size: 22px; color: var(--kb-coral); }

/* ---- 입장 게이트 (play) ---- */
.kb-gate { max-width: 420px; margin: 8vh auto; padding: 30px 24px; background: rgba(255,255,255,.05);
  border: 2px solid rgba(255,255,255,.1); border-radius: 24px; }
.kb-logo { font-weight: 900; font-size: 44px; text-align: center; margin-bottom: 6px; }
.kb-logo span { color: var(--kb-yellow); }
.kb-sub { color: var(--kb-dim); font-weight: 700; text-align: center; margin-bottom: 24px; }
.kb-field { margin-bottom: 16px; }
.kb-field label { display: block; font-weight: 800; font-size: 14px; color: var(--kb-dim); margin-bottom: 7px; }
.kb-input { width: 100%; font-family: inherit; font-weight: 800; font-size: 20px; padding: 14px 16px;
  border-radius: 14px; border: 2px solid rgba(255,255,255,.14); background: var(--kb-ink2); color: var(--kb-paper); }
.kb-input.code { text-transform: uppercase; letter-spacing: .3em; text-align: center; font-size: 30px; }
.kb-enter { width: 100%; margin-top: 8px; }
.kb-err { color: var(--kb-coral); font-weight: 800; text-align: center; margin-top: 12px; min-height: 22px; }

/* ---- 연결 상태 ---- */
.kb-conn { position: fixed; right: 12px; bottom: 12px; font-size: 12px; font-weight: 700;
  color: var(--kb-dim); background: rgba(0,0,0,.35); padding: 6px 12px; border-radius: 999px; }
.kb-conn.ok { color: var(--kb-mint); }
.kb-conn.err { color: var(--kb-coral); }

@keyframes kbPop { from { transform: scale(.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* ---- 혼자 모드 (일일 도전 · 트랙 C) ---- */
.kb-solo-head { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.kb-solo-pos { font-weight: 900; font-size: 15px; color: var(--kb-dim); white-space: nowrap; }
.kb-solo-bar { flex: 1; height: 10px; border-radius: 999px; background: rgba(255,255,255,.1); overflow: hidden; }
.kb-solo-bar i { display: block; height: 100%; background: var(--kb-mint);
  transition: width .4s cubic-bezier(.22,1,.36,1); }
.kb-solo-score { font-weight: 900; font-size: 15px; color: var(--kb-yellow); white-space: nowrap; }
.kb-solo-next { margin-top: 22px; }
.kb-partner-slot { font-size: 52px; line-height: 1; margin-bottom: 10px; }  /* 제6조 파트너 자리 */

/* ---- 명부 입장 (트랙 A · 제7조) ---- */
.kb-again { width: 100%; background: var(--kb-mint); color: #05302b; margin-bottom: 18px; line-height: 1.35; }
.kb-again small { display: block; font-size: 13px; font-weight: 800; opacity: .75; margin-top: 4px; }
.kb-ghost { width: 100%; margin-top: 10px; background: var(--kb-ink2); color: var(--kb-paper);
  box-shadow: 0 5px 0 rgba(0,0,0,.28); border: 2px solid rgba(255,255,255,.1); font-size: 17px; }
.kb-back { display: block; margin: 22px auto 0; background: none; border: 0; cursor: pointer;
  font-family: inherit; font-weight: 800; font-size: 14px; color: var(--kb-dim); }
.kb-namegrid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin-top: 16px; }
.kb-name { font-family: inherit; font-weight: 900; font-size: 17px; padding: 16px 6px; border: 0;
  border-radius: 14px; background: var(--kb-ink2); color: var(--kb-paper); cursor: pointer;
  border: 2px solid rgba(255,255,255,.1); box-shadow: 0 4px 0 rgba(0,0,0,.25); }
.kb-name:active { transform: translateY(2px); box-shadow: 0 2px 0 rgba(0,0,0,.25); }

/* ---- 판 끝 · 내 XP (KB-2: 내 폰에만) ---- */
.kb-xp-slot { min-height: 30px; }
.kb-xp-gain { font-weight: 900; font-size: 20px; color: var(--kb-mint); margin-top: 12px; animation: kbPop .3s ease; }
.kb-promote { font-weight: 900; font-size: 24px; color: var(--kb-yellow); margin-top: 6px; animation: kbPop .45s ease; }

/* ---- 교사 화면 (class.html · 제1조 ③ 교사 무료) ---- */
.kb-panel { background: var(--kb-ink2); border: 2px solid rgba(255,255,255,.08); border-radius: 20px;
  padding: 22px; margin-bottom: 20px; }
.kb-panel h2 { margin: 0 0 14px; font-size: 20px; font-weight: 900; }
.kb-panel .kb-hint { color: var(--kb-dim); font-weight: 700; font-size: 14px; margin: -6px 0 14px; line-height: 1.5; }
.kb-area { width: 100%; min-height: 120px; font-family: inherit; font-weight: 700; font-size: 16px;
  padding: 14px; border-radius: 14px; border: 2px solid rgba(255,255,255,.14);
  background: rgba(0,0,0,.2); color: var(--kb-paper); resize: vertical; }
.kb-list { display: flex; flex-wrap: wrap; gap: 8px; }
.kb-list .kb-chip { display: inline-flex; align-items: center; gap: 8px; font-size: 16px; }
.kb-list .kb-x { background: none; border: 0; color: var(--kb-coral); font-weight: 900;
  font-size: 16px; cursor: pointer; padding: 0; line-height: 1; }
.kb-bars { display: grid; gap: 10px; }
.kb-bar-row { display: grid; grid-template-columns: 140px 1fr 74px; align-items: center; gap: 12px; }
.kb-bar-name { font-weight: 800; font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kb-bar-track { height: 14px; border-radius: 999px; background: rgba(255,255,255,.08); overflow: hidden; }
.kb-bar-fill { display: block; height: 100%; border-radius: 999px; background: var(--kb-mint);
  transition: width .5s cubic-bezier(.22,1,.36,1); }
.kb-bar-fill.weak { background: var(--kb-coral); }
.kb-bar-num { font-weight: 900; font-size: 14px; color: var(--kb-dim); text-align: right; }
.kb-danger { background: var(--kb-coral); color: #3a0000; font-size: 15px; padding: 11px 20px; }

/* ---- 단원 고르기 (교과 문제 · 제10조 9번) ---- */
.kb-unit-wrap { max-width: 900px; margin: 0 auto; text-align: left; }
.kb-unit-row { display: flex; align-items: flex-start; gap: 14px; padding: 12px 0;
  border-top: 1px solid rgba(255,255,255,.08); }
.kb-unit-grade { flex: 0 0 62px; font-weight: 900; font-size: 16px; color: var(--kb-yellow); padding-top: 8px; }
.kb-unit-list { display: flex; flex-wrap: wrap; gap: 8px; }
.kb-unit { font-family: inherit; font-weight: 800; font-size: 15px; padding: 10px 14px; border: 0;
  border-radius: 12px; background: var(--kb-ink2); color: var(--kb-paper); cursor: pointer;
  border: 2px solid rgba(255,255,255,.1); box-shadow: 0 3px 0 rgba(0,0,0,.25); }
.kb-unit:hover { border-color: var(--kb-mint); }
.kb-unit:active { transform: translateY(2px); box-shadow: 0 1px 0 rgba(0,0,0,.25); }

/* ---- 친구 방 (트랙 B) ---- */
.kb-friend { padding-top: 6px; }
.kb-friend-code { display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 16px; border-radius: 18px; background: var(--kb-ink2); margin-bottom: 16px;
  border: 2px solid rgba(255,255,255,.08); }
.kb-friend-code b { font-weight: 900; font-size: 46px; letter-spacing: .18em;
  color: var(--kb-yellow); line-height: 1.1; }
.kb-friend-code .kb-sub { font-size: 12px; }
.kb-friend .kb-host-bar { display: none; }        /* 방장 폰엔 큰 방코드가 이미 위에 있다 */
.kb-friend .kb-stage { padding: 0; }
.kb-friend .kb-big { font-size: 20px; margin: 4px 0; }
.kb-friend .kb-host-q { display: none; }          /* 문제는 아래 내 화면에서 푼다 (중복 노출 금지) */
.kb-friend .kb-resp-count { font-size: 15px; margin-bottom: 10px; }

/* ---- 배지 (제6조 — 파트너 외형 분기의 소스) ---- */
.kb-badges { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.kb-badge { text-align: center; padding: 10px 4px 8px; border-radius: 14px;
  background: rgba(255,255,255,.05); border: 2px solid rgba(255,255,255,.06); }
.kb-badge.got { background: rgba(45,212,191,.12); border-color: rgba(45,212,191,.5); }
.kb-badge-e { font-size: 30px; line-height: 1.1; filter: grayscale(1); opacity: .35; }
.kb-badge.got .kb-badge-e { filter: none; opacity: 1; animation: kbPop .35s ease; }
.kb-badge-n { font-weight: 800; font-size: 11px; margin-top: 5px; line-height: 1.25; }
.kb-badge-b { font-size: 9px; }
.kb-badge-s { font-size: 10px; font-weight: 800; color: var(--kb-mint); margin-top: 3px; }
.kb-badge-bar { height: 4px; border-radius: 999px; background: rgba(255,255,255,.1);
  overflow: hidden; margin: 6px 4px 0; }
.kb-badge-bar i { display: block; height: 100%; background: var(--kb-sky); }
.kb-badge-hint { margin-top: 12px; font-size: 12px; font-weight: 700; color: var(--kb-dim); text-align: center; }

/* ---- 학부모 리포트 (제1조 ② — 보는 눈) ---- */
.kb-rep-wrap { max-width: 720px; margin: 0 auto; padding: 10px 0 60px; }
.kb-rep-head { text-align: center; margin-bottom: 24px; }
.kb-rep-head h1 { font-size: 30px; font-weight: 900; margin: 0 0 8px; }
.kb-rep-head p { color: var(--kb-dim); font-weight: 700; font-size: 15px; line-height: 1.6; margin: 0; }
.kb-rep-line { color: var(--kb-paper) !important; font-size: 17px !important; }
.kb-rep-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 20px; }
.kb-rep-card { background: var(--kb-ink2); border-radius: 16px; padding: 16px 8px; text-align: center;
  border: 2px solid rgba(255,255,255,.06); }
.kb-rep-card b { display: block; font-size: 22px; font-weight: 900; color: var(--kb-yellow); }
.kb-rep-card span { display: block; font-size: 11px; font-weight: 700; color: var(--kb-dim); margin-top: 4px; }
.kb-rep-todo { background: rgba(45,212,191,.1); border: 2px solid rgba(45,212,191,.35);
  border-radius: 14px; padding: 16px; }
.kb-rep-todo b { display: block; font-size: 17px; font-weight: 900; color: var(--kb-mint); margin-bottom: 6px; }
.kb-rep-todo p { margin: 0; font-weight: 700; font-size: 14px; line-height: 1.6; color: rgba(255,255,255,.8); }
.kb-rep-row { display: grid; grid-template-columns: 1fr 2fr 62px; align-items: center; gap: 12px;
  padding: 8px 0; font-weight: 800; font-size: 15px; }
.kb-rep-bar { display: block; height: 12px; border-radius: 999px; background: rgba(255,255,255,.08); overflow: hidden; }
.kb-rep-bar i { display: block; height: 100%; border-radius: 999px; }
.kb-rep-n { text-align: right; font-size: 13px; color: var(--kb-dim); font-weight: 800; }
.kb-rep-empty { color: var(--kb-dim); font-weight: 700; font-size: 14px; padding: 6px 0; }
.kb-rep-growth { display: flex; align-items: flex-end; gap: 10px; height: 130px; padding-top: 8px; }
.kb-rep-g { flex: 1; display: flex; flex-direction: column; justify-content: flex-end;
  align-items: center; height: 100%; gap: 6px; }
.kb-rep-g i { display: block; width: 100%; max-width: 46px; border-radius: 8px 8px 0 0;
  background: linear-gradient(180deg, var(--kb-mint), var(--kb-sky)); }
.kb-rep-g span { font-size: 11px; font-weight: 800; color: var(--kb-dim); }
.kb-rep-note { margin-top: 22px; text-align: center; color: var(--kb-dim);
  font-weight: 700; font-size: 13px; line-height: 1.7; }

/* 소수점 키 (마이너스와 함께 필요할 때만 아래 한 줄로) */
.kb-key-dot { width: 100%; margin-top: 8px; font-size: 18px; }