/* 레이아웃: 한 화면 앱 — 상단 바(육각 마크·탭) + 본문(채팅 또는 학습). 폭 820px 중앙 컬럼.
   단일 다크 테마(Industrial Tech Navy): 남색 바탕, 주황 강조, 한국어=시안, 일본어=라일락 */
:root{
  --bg:#0A1628; --panel:#0F1E36; --surface:#15284A; --surface-2:#0F1E36; --ink:#EAF0FA; --muted:#93A6C6; --dim:#5D7196; --line:#27406A;
  --accent:#FFA726; --on-accent:#0A1628;
  --ko:#4FC3F7; --ko-soft:#123250; --ja:#D29BF0; --ja-soft:#2A2350;
  --ok:#4DD8A8; --warn:#FFA726; --danger:#FF7A7A;
  --display:"IBM Plex Sans Condensed","IBM Plex Sans","Noto Sans KR","Noto Sans JP",sans-serif;
  --body:"IBM Plex Sans","Noto Sans KR","Noto Sans JP",system-ui,-apple-system,"Apple SD Gothic Neo","Hiragino Sans",sans-serif;
  --body-ja:"IBM Plex Sans","Noto Sans JP","Noto Sans KR",system-ui,-apple-system,"Hiragino Sans",sans-serif;
  --mono:"IBM Plex Mono","Noto Sans KR",ui-monospace,Menlo,monospace;
  --r:16px;
  color-scheme:dark;
}
html,body{height:100%}
body{background:var(--bg) radial-gradient(ellipse at 50% 0%,#10223d 0%,var(--bg) 70%) no-repeat;color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.6}
:lang(ja){font-family:var(--body-ja)}
button,input,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin:0}
.hex{width:30px;height:34px;flex:none;align-self:center}
::placeholder{color:var(--dim)}
.wrap{max-width:820px;margin:0 auto;padding-inline:16px;height:100%;display:flex;flex-direction:column;min-height:0}

/* 입장 화면 */
.gate{flex:1;display:flex;align-items:center;padding-block:32px}
.gate-card{width:100%;max-width:420px;display:grid;gap:22px}
.mark{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.mark b{font-family:var(--display);font-size:clamp(40px,9vw,56px);font-weight:700;letter-spacing:-.01em;line-height:1}
.mark span{font-family:var(--display);font-size:clamp(22px,5vw,28px);font-weight:600;color:var(--accent)}
.gate .hex{width:46px;height:52px}
.bridge{height:4px;border-radius:2px;background:linear-gradient(90deg,var(--ko),var(--accent) 50%,var(--ja));max-width:240px}
.sub{color:var(--muted);margin:0}
.field{display:grid;gap:6px}
.field label{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.input{width:100%;box-sizing:border-box;border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:12px 14px}
.btn{border:0;border-radius:10px;padding:12px 18px;font-weight:700;background:var(--accent);color:var(--on-accent)}
.btn:disabled{opacity:.5;cursor:default}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line);font-weight:500}
.btn.small{padding:6px 12px;font-size:13px}
.err{color:var(--danger);font-size:14px;margin:0;min-height:1.4em}

/* 언어 선택 */
.langs{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.lang-pick{border:2px solid var(--line);background:var(--surface);border-radius:var(--r);padding:16px;text-align:left;display:grid;gap:4px}
.lang-pick strong{font-size:18px}
.lang-pick small{color:var(--muted)}
.lang-pick[aria-pressed="true"].ko{border-color:var(--ko);background:var(--ko-soft)}
.lang-pick[aria-pressed="true"].ja{border-color:var(--ja);background:var(--ja-soft)}

/* 상단 바 */
.top{display:flex;align-items:center;gap:12px;padding-block:12px 8px;flex-wrap:wrap}
.top .mark b{font-size:26px}
.top .mark span{font-size:16px}
.partner{margin-left:auto;display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);min-width:0}
.dot{width:8px;height:8px;border-radius:50%;flex:none}
.tag{font-size:11px;font-weight:700;letter-spacing:.06em;padding:2px 7px;border-radius:999px}
.tag.ko{background:var(--ko-soft);color:var(--ko)}
.tag.ja{background:var(--ja-soft);color:var(--ja)}
.icon-btn{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:5px 12px;font-size:13px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);overflow-x:auto}
.tab{border:0;background:none;padding:10px 14px;font-weight:500;color:var(--muted);border-bottom:2px solid transparent;margin-bottom:-1px;white-space:nowrap}
.tab[aria-selected="true"]{color:var(--ink);border-bottom-color:var(--accent);font-weight:700}
.top{border-bottom:0}
.top .hex{width:26px;height:30px}

.view{flex:1;min-height:0;display:flex;flex-direction:column}

/* 채팅 */
.chat-tools{display:flex;justify-content:space-between;align-items:center;gap:8px;padding-block:8px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.toggle{display:flex;align-items:center;gap:6px}
.log{flex:1;min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:10px;padding-block:8px 16px}
.daysep{align-self:center;font-size:12px;color:var(--muted);background:var(--surface-2);padding:2px 10px;border-radius:999px;font-variant-numeric:tabular-nums}
.msg{display:flex;flex-direction:column;max-width:min(78%,560px);gap:3px}
.msg.mine{align-self:flex-end;align-items:flex-end}
.msg .who{font-size:12px;color:var(--muted)}
.bubble{border-radius:16px;padding:9px 13px;white-space:pre-wrap;overflow-wrap:anywhere;min-width:0}
.msg.theirs .bubble{background:var(--surface);border:1px solid var(--line);border-top-left-radius:4px}
.msg.mine.ko .bubble{background:var(--ko);color:var(--on-accent);border-top-right-radius:4px}
.msg.mine.ja .bubble{background:var(--ja);color:var(--on-accent);border-top-right-radius:4px}
.sec{font-size:13px;color:var(--muted);white-space:pre-wrap;overflow-wrap:anywhere;padding-inline:4px}
.sec .lbl{font-size:11px;font-weight:700;letter-spacing:.04em;margin-right:6px}
.pron{font-size:12px;color:var(--muted);padding-inline:4px;overflow-wrap:anywhere}
.meta{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums;display:flex;gap:8px;align-items:center}
.linkish{border:0;background:none;padding:0;color:var(--ko);font-size:12px;text-decoration:underline}
.empty{margin:auto;max-width:360px;color:var(--muted);text-align:center;padding:24px 8px}
.notice{border:1px solid var(--line);background:var(--surface-2);border-radius:10px;padding:10px 12px;font-size:13px;color:var(--muted);margin-block:8px}
.notice.bad{color:var(--danger)}
.composer{display:flex;gap:8px;align-items:flex-end;padding-block:8px calc(12px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--line)}
.composer textarea{flex:1;min-width:0;resize:none;max-height:140px;border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:10px 12px;line-height:1.5}
.mic{align-self:flex-end;padding:9px 12px;font-size:16px;line-height:1}
.mic[aria-pressed="true"]{background:var(--danger);border-color:var(--danger);color:var(--on-accent)}
.count{font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}

/* 학습 */
.study{flex:1;min-height:0;overflow-y:auto;padding-block:12px 24px;display:flex;flex-direction:column;gap:14px}
.lead{display:flex;justify-content:space-between;align-items:baseline;gap:8px;flex-wrap:wrap}
.lead h2{font-family:var(--display);font-size:26px;font-weight:700;margin:0;text-wrap:balance}
.lead p{margin:0;color:var(--muted);font-size:13px}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 12px;font-size:13px}
.chip[aria-pressed="true"]{background:var(--accent);color:var(--on-accent);border-color:var(--accent);font-weight:700}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.seg button{border:0;background:var(--surface);padding:7px 14px;font-size:13px}
.seg button[aria-pressed="true"]{background:var(--surface-2);font-weight:700}
.progress{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;display:flex;align-items:center;gap:8px}
.bar{width:120px;height:6px;border-radius:3px;background:var(--surface-2);overflow:hidden}
.bar i{display:block;height:100%;background:var(--ok)}
.cards{display:grid;gap:10px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;display:grid;gap:4px}
.card .target{font-size:19px;font-weight:700;overflow-wrap:anywhere}
.card .reading{font-size:13px;color:var(--muted)}
.card .pr{font-size:13px}
.card .pr b{font-size:11px;letter-spacing:.04em;margin-right:6px}
.card .mean{font-size:14px;color:var(--muted);border-top:1px dashed var(--line);padding-top:6px;margin-top:4px}
.card .row{display:flex;gap:8px;align-items:center;justify-content:flex-end;flex-wrap:wrap}
.card.known{border-color:color-mix(in srgb,var(--ok) 50%,var(--line))}
.ai-badge{font-size:10px;font-weight:700;letter-spacing:.06em;color:var(--warn)}
.t-ko .target,.t-ko .pr b{color:var(--ko)}
.t-ja .target,.t-ja .pr b{color:var(--ja)}
.quiz{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:22px 18px;display:grid;gap:12px;text-align:left}
.quiz .q{font-size:20px;font-weight:700}
.quiz .n{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.quiz .actions{display:flex;gap:8px;flex-wrap:wrap}
.role{display:grid;gap:10px}
.turn{display:grid;gap:3px;max-width:min(88%,600px)}
.turn.me{justify-self:end;text-align:right}
.turn .line{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:9px 13px;overflow-wrap:anywhere}
.turn.me .line{background:var(--surface-2)}
.tip{font-size:13px;border-left:3px solid var(--warn);padding:4px 10px;background:var(--surface-2);border-radius:0 8px 8px 0}
.role-input{display:flex;gap:8px}
.role-input input{flex:1;min-width:0}

/* 설정 */
.sheet{position:fixed;inset:0;background:color-mix(in srgb,var(--bg) 78%,transparent);display:flex;align-items:flex-end;justify-content:center;padding:16px;z-index:10}
.sheet-card{background:var(--surface);border-radius:16px;padding:20px;width:100%;max-width:420px;display:grid;gap:14px;margin-bottom:env(safe-area-inset-bottom,0px)}
.sheet-card h3{margin:0;font-size:17px}
.row-end{display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}
@media (min-width:640px){.sheet{align-items:center}}
.daysep,.meta,.count,.progress,.quiz .n,.tag{font-family:var(--mono)}
.sec .lbl,.card .pr b,.ai-badge{font-family:var(--mono);text-transform:uppercase}
.msg.theirs .bubble{background:var(--surface)}
.seg button[aria-pressed="true"]{background:var(--surface);color:var(--accent)}
.lang-pick{background:var(--panel)}
.sheet-card{border:1px solid var(--line)}
.gate-card,.top,.study>*{animation:none}
@media (prefers-reduced-motion:no-preference){
  .msg,.card,.turn{animation:rise .5s cubic-bezier(.2,.7,.2,1)}
  .gate-card>*{animation:rise .8s cubic-bezier(.2,.7,.2,1) both}
  .gate-card>*:nth-child(2){animation-delay:.08s}.gate-card>*:nth-child(3){animation-delay:.16s}.gate-card>*:nth-child(4){animation-delay:.24s}.gate-card>*:nth-child(n+5){animation-delay:.32s}
  @keyframes rise{from{transform:translateY(10px)}to{transform:none}}}

/* 서버판 추가 */
.hex polygon{fill:none;stroke:var(--accent);stroke-width:2}
.hex .arch{fill:none;stroke:var(--ink);stroke-width:2;stroke-linecap:round}
.hex .deck{fill:none;stroke:var(--ink);stroke-width:1.4;opacity:.55}
.dot.ko{background:var(--ko)}.dot.ja{background:var(--ja)}
.dot.off{background:var(--dim)}
.partner b{color:var(--ink);font-weight:500}
.users{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.alt{font-size:12px;color:var(--muted);white-space:pre-wrap;overflow-wrap:anywhere;padding-inline:4px}
.alt .lbl{font-family:var(--mono);font-size:10px;font-weight:700;letter-spacing:.06em;margin-right:6px;text-transform:uppercase}
.empty{white-space:pre-line}
.hint{font-size:12px;color:var(--muted);margin:0}
.notes{font-size:12px}
.stack{display:grid;gap:4px;justify-items:end}
.live{font-family:var(--mono);font-size:11px;color:var(--muted)}
.live.on{color:var(--ok)}
.label-like{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}