/* =====================================================================
   MATH Studio  —  app.css
   _design 시안(보카 스튜디오)의 토큰 체계를 그대로 쓰되 수학 문제은행용
   컴포넌트(문항 카드 · 필터 패널 · 도형 SVG · 인쇄 시트)를 추가했다.
   3개 테마(스튜디오/저널/레벨업)를 body.theme-* 로 전환.
   본문 폰트: Paperlogy (self-host, CSP font-src 'self').
   ===================================================================== */

@font-face{
  font-family:'Paperlogy';
  src:url('/assets/fonts/Paperlogy-Regular.woff2') format('woff2');
  font-weight:400 700;
  font-style:normal;
  font-display:swap;
}

/* ── 테마 토큰 ─────────────────────────────────────────────────── */
:root, .theme-studio {
  --bg:#F5F6F8; --surface:#ffffff; --surface-2:#F7F8FB; --border:#E7E9EF;
  --text:#171A21; --muted:#6A7180; --muted-2:#9AA0AC;
  --primary:#4C51E0; --primary-dark:#4046C8; --primary-soft:#EDEEFB; --on-primary:#ffffff;
  --sidebar:#12151C; --sidebar-2:#1A1F29; --sidebar-text:#C7CCD6; --sidebar-muted:#7C8493; --sidebar-active:#1E2430;
  --teal:#12B3A6; --teal-soft:#E1F4F1; --amber:#F5A524; --amber-soft:#FDF0D8; --red:#E5484D; --red-soft:#FBE3E4;
  --track:#EDEEF4;
  /* 도형 전용 4색 (도형 컴포넌트는 이 4개만 쓴다) */
  --fig-line:#171A21; --fig-fill:#ffffff; --fig-accent:#4C51E0; --fig-muted:#9AA0AC;
  --font-head:'Paperlogy',system-ui,sans-serif; --font-mono:'Paperlogy',system-ui,sans-serif;
  --radius:14px; --radius-sm:10px; --radius-lg:18px;
  --shadow:0 10px 30px -18px rgba(23,26,33,.3); --shadow-lg:0 30px 70px -20px rgba(0,0,0,.4);
}
.theme-journal {
  --bg:#EDEAE3; --surface:#ffffff; --surface-2:#FAF7F0; --border:#E9E1D2;
  --text:#23201B; --muted:#6B6459; --muted-2:#A79E8E;
  --primary:#2E5D4E; --primary-dark:#264C40; --primary-soft:#EEF3EE; --on-primary:#F4EFE6;
  --sidebar:#26332C; --sidebar-2:#2E3D34; --sidebar-text:#D9E0DB; --sidebar-muted:#96A69B; --sidebar-active:#35473C;
  --teal:#2E5D4E; --teal-soft:#EEF3EE; --amber:#B4553B; --amber-soft:#F6E7E1; --red:#B4553B; --red-soft:#F6E7E1;
  --track:#EDE4D3;
  --fig-line:#23201B; --fig-fill:#ffffff; --fig-accent:#2E5D4E; --fig-muted:#A79E8E;
  --radius:13px; --radius-sm:9px; --radius-lg:16px;
}
.theme-levelup {
  --bg:#FFF4EC; --surface:#ffffff; --surface-2:#FFF6EF; --border:#FCE7DA;
  --text:#2B2440; --muted:#877E9B; --muted-2:#9A93AB;
  --primary:#FF6A3D; --primary-dark:#EC5A2F; --primary-soft:#FFEDE4; --on-primary:#ffffff;
  --sidebar:#2B2440; --sidebar-2:#372E52; --sidebar-text:#C9C2DE; --sidebar-muted:#8B82A6; --sidebar-active:#3E3560;
  --teal:#0E9E86; --teal-soft:#EAFBF6; --amber:#FF8A00; --amber-soft:#FFF0E0; --red:#E5484D; --red-soft:#FDECEC;
  --track:#F0ECFB;
  --fig-line:#2B2440; --fig-fill:#ffffff; --fig-accent:#FF6A3D; --fig-muted:#9A93AB;
  --radius:20px; --radius-sm:13px; --radius-lg:22px;
}

/* ── 리셋/기본 ─────────────────────────────────────────────────── */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--text);font-family:'Paperlogy',Pretendard,system-ui,sans-serif;-webkit-font-smoothing:antialiased;font-size:14px;line-height:1.5}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
input,textarea,select{font-family:inherit}
code{font-family:var(--font-mono);background:var(--surface-2);padding:1px 6px;border-radius:5px;font-size:12.5px}
.mono{font-family:var(--font-mono)}
.muted{color:var(--muted)}
.sm{font-size:12px}
.ml-auto{margin-left:auto}
.mt{margin-top:14px}.mt2{margin-top:18px}.mt-1{margin-top:6px}.mb{margin-bottom:14px}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ── 레이아웃 셸 ───────────────────────────────────────────────── */
.shell{display:flex;height:100vh;overflow:hidden}
.sidebar{width:214px;flex:none;background:var(--sidebar);color:var(--sidebar-text);display:flex;flex-direction:column;padding:18px 14px}
.brand{display:flex;align-items:center;gap:10px;padding:2px 6px 20px}
.brand-mark{width:32px;height:32px;border-radius:9px;background:var(--primary);color:var(--on-primary);display:flex;align-items:center;justify-content:center;font-family:var(--font-head);font-weight:700;font-size:17px}
.brand-name{font-family:var(--font-head);font-weight:700;font-size:15px;color:#fff;line-height:1.1}
.brand-sub{font-size:10.5px;color:var(--sidebar-muted)}
.nav{display:flex;flex-direction:column;gap:3px}
.nav-section{font-size:10.5px;color:var(--sidebar-muted);padding:10px 8px 6px;letter-spacing:.06em}
.nav-item{display:flex;align-items:center;gap:11px;padding:10px 11px;border-radius:9px;font-size:13.5px;color:var(--sidebar-text);cursor:pointer;transition:background .15s}
.nav-item span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav-item svg{flex:none}
.nav-item:hover{background:var(--sidebar-2)}
.nav-item.is-active{background:var(--sidebar-active);color:#fff;font-weight:600;box-shadow:inset 3px 0 0 var(--primary)}
.nav-badge{margin-left:auto;flex:none;background:var(--primary);color:var(--on-primary);font-size:10.5px;font-weight:700;padding:1px 7px;border-radius:10px}
.side-foot{margin-top:auto;background:var(--sidebar-2);border-radius:11px;padding:11px}
.side-foot-label{font-size:10px;color:var(--sidebar-muted);padding:0 2px 6px}
.theme-switch{display:flex;background:rgba(0,0,0,.28);border-radius:8px;padding:3px;font-size:11px;font-weight:600}
.theme-switch a{flex:1;text-align:center;padding:6px 4px;border-radius:6px;color:var(--sidebar-muted)}
.theme-switch a.on{background:var(--primary);color:var(--on-primary)}

.main{flex:1;display:flex;flex-direction:column;overflow:hidden}
.topbar{display:flex;align-items:center;gap:14px;padding:14px 26px;background:var(--surface);border-bottom:1px solid var(--border)}
.nav-toggle{display:none;background:none;border:none;color:var(--text);cursor:pointer;padding:4px}
.topbar-title{margin-right:auto;min-width:0}
.topbar-title .pt{font-family:var(--font-head);font-weight:600;font-size:19px;letter-spacing:-.01em}
.topbar-title .ps{font-size:12.5px;color:var(--muted);margin-top:1px}
.topbar-right{display:flex;align-items:center;gap:12px}
.cart-chip{display:inline-flex;align-items:center;gap:6px;background:var(--surface-2);color:var(--muted);padding:7px 12px;border-radius:20px;font-size:12.5px;font-weight:700;border:1px solid var(--border)}
.cart-chip.on{background:var(--primary-soft);color:var(--primary-dark);border-color:var(--primary)}
.who{display:inline-flex;align-items:baseline;gap:5px}
.who-name{font-weight:600;font-size:13.5px;color:var(--text)}
.who-role{font-size:11.5px;color:var(--muted)}
.logout-form{display:inline-flex}
.logout-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--surface);color:var(--muted);font-size:13px;font-weight:600;cursor:pointer}
.logout-btn:hover{background:var(--surface-2);color:var(--text)}
.content{flex:1;overflow-y:auto;overflow-x:hidden;padding:22px 26px 44px}
.flash-wrap{padding:12px 26px 0}
.page,.page-wide{width:100%;max-width:100%}

/* ── 공통 컴포넌트 ─────────────────────────────────────────────── */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px}
.card.p0{padding:0}
.card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;gap:10px}
.card-title{font-family:var(--font-head);font-weight:600;font-size:15px}
.card-title.sm{font-size:14px}
.card-link{font-size:12px;color:var(--primary);font-weight:600}
.split-2{display:grid;grid-template-columns:1.55fr 1fr;gap:15px;margin-top:15px}
.col-gap{display:flex;flex-direction:column;gap:14px}
.col-gap-sm{display:flex;flex-direction:column;gap:11px}
.empty{padding:26px;text-align:center;color:var(--muted)}
.hint{font-size:11.5px;color:var(--muted-2);margin-top:8px;line-height:1.6}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:var(--radius-sm);font-weight:600;font-size:14px;padding:11px 16px;cursor:pointer;transition:background .15s;white-space:nowrap}
.btn-primary{background:var(--primary);color:var(--on-primary)}
.btn-primary:hover{background:var(--primary-dark)}
.btn-ghost{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--surface-2)}
.btn-white{background:#fff;color:var(--primary-dark);font-weight:700}
.btn-sm{padding:8px 13px;font-size:12.5px}
.btn-block{display:flex;width:100%}
.btn:disabled{opacity:.5;cursor:not-allowed;pointer-events:none}

.chip{display:inline-flex;align-items:center;gap:4px;font-size:11px;padding:2px 8px;border-radius:10px;background:var(--surface-2);color:var(--muted);white-space:nowrap}
.chip-indigo{color:var(--primary);background:var(--primary-soft)}
.chip-teal{color:var(--teal);background:var(--teal-soft)}
.chip-amber{color:var(--amber);background:var(--amber-soft)}
.chip-red{color:var(--red);background:var(--red-soft)}
.pill{font-size:11.5px;padding:2px 9px;border-radius:10px;background:var(--surface-2);color:var(--muted)}
.tag{display:inline-block;font-size:11.5px;color:var(--muted);background:var(--surface-2);padding:2px 8px;border-radius:8px}
a.tag:hover{background:var(--primary-soft);color:var(--primary-dark)}

.bar{flex:1;height:7px;background:var(--track);border-radius:5px;overflow:hidden}
.bar-in{height:100%;border-radius:5px}
.bar-indigo{background:var(--primary)}
.list-rows{display:flex;flex-direction:column;gap:9px}
.lr{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:12.5px}
.link-del{background:none;border:none;color:var(--red);font-size:12px;cursor:pointer;font-weight:600;white-space:nowrap;padding:0}
.link-act{background:none;border:none;color:var(--primary);font-size:12px;cursor:pointer;font-weight:600;padding:0}
.row-actions{display:flex;align-items:center;gap:10px;justify-content:flex-end;flex-wrap:wrap}
.back-link{font-size:13px;color:var(--muted);font-weight:600}

.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-top:16px}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:13px;padding:15px 16px}
.stat-label{font-size:11.5px;color:var(--muted)}
.stat-num{font-family:var(--font-head);font-weight:700;font-size:23px;margin-top:5px}
.stat-sub{color:var(--muted-2);font-size:14px;margin-left:3px}

.thead{background:var(--surface-2);font-size:11.5px;color:var(--muted);font-weight:600;padding:12px 20px}
.trow{padding:13px 20px;border-top:1px solid var(--border);align-items:center}
.trow:hover{background:var(--surface-2)}
.trow > *,.thead > *{min-width:0;overflow-wrap:anywhere}
.paper-grid{display:grid;grid-template-columns:2.2fr .6fr .8fr 1fr 1.1fr;gap:10px;align-items:center}

.pager{display:flex;align-items:center;justify-content:center;gap:14px;margin-top:18px}
.pager-btn{display:inline-flex;padding:7px 14px;border:1px solid var(--border);border-radius:8px;font-size:13px;font-weight:600;background:var(--surface)}
.pager-btn:hover{background:var(--surface-2)}
.pager-btn.is-disabled{opacity:.4;pointer-events:none}
.pager-info{font-size:13px;color:var(--muted);font-family:var(--font-mono)}

.field{display:flex;flex-direction:column;gap:6px;font-size:12.5px;color:var(--muted)}
.field span{font-weight:500}
.field input:not([type=checkbox]):not([type=radio]),
.field select,.field textarea{border:1px solid var(--border);border-radius:var(--radius-sm);padding:11px 13px;font-size:14px;color:var(--text);background:var(--surface);outline:none;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--primary)}
.chip-check{display:inline-flex;align-items:center;gap:6px;padding:8px 13px;border-radius:10px;font-size:12.5px;font-weight:600;border:1.5px solid var(--border);background:var(--surface);color:var(--muted);cursor:pointer}
.chip-check.on{border-color:var(--primary);background:var(--primary-soft);color:var(--primary-dark)}
.chip-check input{display:none}
.chk-inline{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;color:var(--muted);cursor:pointer}
.chk-inline input{accent-color:var(--primary);margin:0}
.seg{display:flex;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:3px;gap:3px}
.seg-opt{flex:1 1 0;display:flex;align-items:center;justify-content:center;gap:7px;padding:10px 8px;border-radius:8px;font-size:13.5px;font-weight:600;color:var(--muted);cursor:pointer}
.seg-opt input{accent-color:var(--primary);margin:0;flex:none}
.seg-opt:has(input:checked){background:var(--surface);color:var(--primary);box-shadow:0 1px 3px rgba(0,0,0,.08)}

.flash{padding:11px 15px;border-radius:var(--radius-sm);font-size:13px;font-weight:500;margin-bottom:10px}
.flash-error{background:var(--red-soft);color:var(--red)}
.flash-success{background:var(--teal-soft);color:var(--teal)}
.flash-info{background:var(--primary-soft);color:var(--primary-dark)}

/* 안내 토스트(담기/빼기 결과) */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(12px);
  background:var(--text);color:var(--surface);padding:11px 18px;border-radius:22px;
  font-size:13px;font-weight:600;box-shadow:var(--shadow-lg);z-index:80;
  opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;max-width:90vw;text-align:center}
.toast.on{opacity:.96;transform:translateX(-50%) translateY(0)}

.hero{background:linear-gradient(105deg,var(--primary-dark),var(--primary));color:#fff;border-radius:var(--radius-lg);padding:24px 26px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.hero-hello{font-size:13px;opacity:.85}
.hero-headline{font-family:var(--font-head);font-weight:600;font-size:24px;margin-top:6px}
.hero-actions{display:flex;align-items:center;gap:14px;margin-top:16px;flex-wrap:wrap}
.hero-progress{font-size:13px;opacity:.92}

.barchart{display:flex;align-items:flex-end;gap:14px;height:130px;margin-top:16px}
.bc-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px;height:100%;justify-content:flex-end}
.bc-bar{width:100%;border-radius:5px 5px 0 0;background:var(--primary);min-height:3px}
.bc-bar.zero{background:var(--track)}
.bc-col span{font-size:11px;color:var(--muted-2);white-space:nowrap}

/* ── 로그인/미니 화면 ──────────────────────────────────────────── */
.center-screen{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;position:relative;z-index:1}
.login-card,.mini-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:30px;width:420px;max-width:100%;box-shadow:var(--shadow)}
.auth-body{background:#0f1115}
.auth-bg{position:fixed;inset:0;z-index:0;overflow:hidden;background:#0f1115}
.auth-bg-img{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1.1s ease}
.auth-bg-img.on{opacity:1}
.auth-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.15),rgba(0,0,0,.42))}
.auth-card{background:color-mix(in srgb, var(--surface) 82%, transparent);
  -webkit-backdrop-filter:blur(16px) saturate(1.15);backdrop-filter:blur(16px) saturate(1.15);
  box-shadow:0 18px 50px rgba(0,0,0,.35)}
.login-brand{display:flex;align-items:center;gap:9px;font-family:var(--font-head);font-weight:700;font-size:17px}
.login-title{font-family:var(--font-head);font-weight:700;font-size:22px;margin-top:16px}
.login-sub{font-size:13px;color:var(--muted);margin-top:4px}
.login-form{margin-top:18px;display:flex;flex-direction:column;gap:12px}
.remember-row{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text);cursor:pointer;user-select:none}
.remember-row input{width:auto;flex:none;margin:0;accent-color:var(--primary)}
.signup-cta{margin-top:16px;text-align:center;font-size:13px;color:var(--muted)}
.signup-cta a{color:var(--primary);font-weight:700}
.mini-code{font-family:var(--font-head);font-weight:700;font-size:44px;color:var(--primary)}
.mini-title{font-family:var(--font-head);font-weight:700;font-size:18px;margin-top:8px}
.mini-text{font-size:13.5px;color:var(--muted);line-height:1.75;margin:8px 0 18px}
.mini-badge{display:inline-block;font-size:11.5px;font-weight:700;padding:4px 10px;border-radius:20px}
.mini-badge.warn{background:var(--red-soft);color:var(--red)}
.install-log{list-style:none;padding:0;margin:14px 0;font-size:13px;color:var(--teal);line-height:1.9}
.install-creds{background:var(--surface-2);border-radius:var(--radius-sm);padding:14px;margin:14px 0;font-size:12.5px;line-height:1.9}

/* =====================================================================
   수식 (KaTeX 대체 · $...$ 부분집합 렌더)
   ===================================================================== */
.mth{white-space:nowrap}
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:-0.5em;margin:0 .18em;line-height:1.15}
.frac .num{display:block;padding:0 .18em;border-bottom:1.4px solid currentColor}
.frac .den{display:block;padding:0 .18em}
.ovl{border-top:1.3px solid currentColor;padding-top:1px}
sup,sub{font-size:.72em;line-height:0}

/* =====================================================================
   도형 SVG  —  색은 4개 변수만 사용
   ===================================================================== */
.fig-wrap{margin:12px 0;display:flex;justify-content:flex-start}
.fig{display:block;width:100%;height:auto}
.fig-sm    .fig{max-width:220px}
.fig-md    .fig{max-width:330px}
/* 인쇄 2단 조판의 칸 폭(≈82mm) 안에서 <text> 가 읽히는 최대 크기 */
.fig-print .fig{max-width:100%}
.fig-print{max-width:250px}
.fig-missing{display:inline-block;margin:10px 0;padding:8px 12px;border:1px dashed var(--red);border-radius:8px;color:var(--red);font-size:12px}

/* 선/면 */
.fig .fk  {stroke:var(--fig-line);fill:none;stroke-linecap:round}
.fig .fkf {fill:var(--fig-line);stroke:none}
.fig .fm  {stroke:var(--fig-muted);fill:none}
.fig .fs  {fill:var(--fig-fill);stroke:var(--fig-line)}
.fig .fa  {stroke:var(--fig-accent);fill:none;stroke-linecap:round}
.fig .faf {fill:var(--fig-accent);stroke:none}
.fig .faf-s{fill:var(--fig-accent);fill-opacity:.28;stroke:var(--fig-line)}
/* 글자 */
.fig text{font-family:var(--font-head);stroke:none}
.fig .fl  {fill:var(--fig-line)}
.fig .fmu {fill:var(--fig-muted)}
.fig .fa-t{fill:var(--fig-accent);font-weight:700}

/* =====================================================================
   문항 탐색 (browse)
   ===================================================================== */
.browse{display:grid;grid-template-columns:246px 1fr;gap:18px;align-items:start}
.filter-panel{position:sticky;top:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 16px 14px}
.fp-block{margin-bottom:14px}
.fp-label{font-size:11px;font-weight:700;color:var(--muted-2);letter-spacing:.05em;margin-bottom:7px}
.fp-input{width:100%;border:1px solid var(--border);border-radius:var(--radius-sm);padding:9px 11px;font-size:13px;background:var(--surface);color:var(--text);outline:none}
.fp-input:focus{border-color:var(--primary)}
.fp-chips{display:flex;flex-wrap:wrap;gap:6px}
.fp-chips .chip-check{padding:6px 11px;font-size:12px}
.fp-actions{display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--border);padding-top:12px}
.result-panel{min-width:0}
.result-bar{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}

.pcard-list{display:flex;flex-direction:column;gap:13px}
.pcard{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 17px 12px}
.pcard-head{display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.pcard-head .ml-auto{display:flex;align-items:center;gap:8px}
.pcode{font-size:11.5px;font-weight:700;color:var(--primary-dark);background:var(--primary-soft);padding:2px 8px;border-radius:7px}
.pcard-body{margin-top:10px}
.ptopic{font-size:12px;color:var(--muted)}
.pstem{font-size:15px;color:var(--text);margin-top:4px;line-height:1.7;overflow-wrap:anywhere}
.pstem.lg{font-size:17px}
.pchoices{margin:10px 0 0;padding-left:22px;font-size:14px;line-height:1.9}
.pchoices.lg{font-size:15px}
.pchoices li{padding-left:2px}
.ptags{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.panswer{margin-top:10px;border-top:1px solid var(--border);padding-top:8px}
.panswer summary{cursor:pointer;font-size:12.5px;font-weight:700;color:var(--primary);list-style:none}
.panswer summary::-webkit-details-marker{display:none}
.panswer summary::before{content:"▸ ";}
.panswer[open] summary::before{content:"▾ ";}
.panswer-in{margin-top:8px;background:var(--surface-2);border-radius:var(--radius-sm);padding:12px 14px}
.pans{font-size:14px}
.pans b{color:var(--primary-dark);margin-right:8px}
.psol{font-size:13px;color:var(--muted);margin-top:7px;line-height:1.8}
.pdetail-topic{font-family:var(--font-head);font-size:17px;margin:12px 0 4px}
.answer-blank{margin-top:14px;font-size:15px;color:var(--muted)}
.blank-line{display:inline-block;width:150px;border-bottom:1.5px solid var(--border);margin:0 6px}
.answer-box{margin-top:14px;height:110px;border:1.5px dashed var(--border);border-radius:var(--radius-sm);color:var(--muted-2);font-size:12.5px;padding:8px 10px}
.detail-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.detail-actions{display:flex;align-items:center;gap:8px}

/* 담기 버튼 */
.cart-btn{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--primary);background:var(--surface);color:var(--primary);
  border-radius:var(--radius-sm);padding:7px 14px;font-size:12.5px;font-weight:700;cursor:pointer;transition:background .15s,color .15s}
.cart-btn:hover{background:var(--primary-soft)}
.cart-btn.on{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.cart-btn:disabled{opacity:.6;cursor:default}

/* ── 시험지 편집 ───────────────────────────────────────────────── */
.cart-list{list-style:none;margin:0;padding:0}
.cart-row{display:flex;align-items:flex-start;gap:12px;padding:13px 18px;border-top:1px solid var(--border);counter-increment:cartn}
.cart-row:first-child{border-top:none}
.cart-row::before{content:counter(cartn);flex:none;width:24px;height:24px;border-radius:7px;background:var(--surface-2);
  color:var(--muted);font-size:11.5px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:2px}
.cart-list{counter-reset:cartn}
.cart-main{flex:1;min-width:0}
.cart-meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.cart-stem{font-size:13.5px;margin-top:6px;color:var(--text);line-height:1.6;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.cart-actions form{display:flex;gap:4px}
.ord-btn{width:28px;height:28px;border:1px solid var(--border);background:var(--surface);color:var(--muted);
  border-radius:8px;font-size:14px;line-height:1;cursor:pointer}
.ord-btn:hover:not(:disabled){background:var(--surface-2);color:var(--text)}
.ord-btn:disabled{opacity:.35;cursor:default}
.ord-btn.del:hover{background:var(--red-soft);border-color:var(--red);color:var(--red)}

/* ── 도형 미리보기(dev) ────────────────────────────────────────── */
.fig-story-grid{display:flex;flex-wrap:wrap;gap:22px;margin-top:10px}
.fig-story-item{margin:0;max-width:340px}
.fig-story-item figcaption{margin-top:6px;color:var(--muted-2);word-break:break-all;line-height:1.5}

/* =====================================================================
   인쇄 시트 (A4)
   ===================================================================== */
.print-body{background:var(--bg)}
.print-toolbar{display:flex;align-items:center;gap:14px;padding:12px 22px;background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.print-toolbar-right{display:flex;align-items:center;gap:14px}
.sheet-host{padding:22px 16px 60px}
.paper-sheet{background:#fff;color:#111;max-width:820px;margin:0 auto;border:1px solid var(--border);border-radius:6px;padding:34px 40px;box-shadow:var(--shadow)}
.paper-head{position:relative;border-bottom:2px solid #111;padding-bottom:12px;margin-bottom:20px}
.paper-academy{position:absolute;top:0;right:0;font-weight:700;font-size:13.5px;color:#111}
.paper-title{font-family:var(--font-head);font-weight:800;font-size:25px;text-align:center;color:#111;margin:0;padding:0 90px;overflow-wrap:anywhere}
.paper-meta{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin-top:12px;font-size:13px;color:#333}
.paper-qs{list-style:decimal;padding-left:24px;margin:0;color:#111}
.paper-qs.cols2{column-count:2;column-gap:30px}
.paper-q{break-inside:avoid;-webkit-column-break-inside:avoid;page-break-inside:avoid;margin-bottom:20px}
.pq-label{font-size:11px;color:#777;margin-bottom:3px;font-family:var(--font-mono)}
.pq-prompt{font-size:14.5px;color:#111;line-height:1.75;overflow-wrap:anywhere}
.pq-opts{list-style:none;padding:0;margin:8px 0 0;display:flex;flex-wrap:wrap;gap:5px 20px}
.pq-opt{font-size:14px;color:#111}
.pq-num{font-weight:700;margin-right:3px}
.pq-blank{margin-top:10px;color:#444;font-size:13.5px}
.pq-work{margin-top:8px;height:92px;border:1px dashed #bbb;border-radius:6px;position:relative}
.pq-work-label{position:absolute;top:5px;left:8px;font-size:11px;color:#999}
.pq-answer{display:none;margin-top:6px;font-size:13px;color:#111}
.pq-answer b{color:#b91c1c}
.sheet-host.teacher .pq-answer{display:block}
/* 인쇄 시트 안의 도형은 항상 검정/흰색 계열로(테마색 무시) */
.paper-sheet .fig{--fig-line:#111;--fig-fill:#fff;--fig-accent:#333;--fig-muted:#999}
.paper-sheet .fig .faf-s{fill-opacity:.18}
.paper-answers{margin-top:30px;border-top:1px dashed #999;padding-top:14px;break-before:page;page-break-before:always}
.pa-title{font-weight:700;font-size:15px;margin-bottom:10px;color:#111}
.pa-list{margin:0;padding-left:24px;color:#111}
.pa-item{font-size:13.5px;margin-bottom:9px;line-height:1.7}
.pa-sol{display:block;color:#555;font-size:12.5px;margin-top:2px}

@media print {
  .sidebar,.topbar,.side-foot,.flash-wrap,.no-print,.nav-toggle,.print-toolbar{display:none !important}
  html,body,.shell,.main,.content,.sheet-host{display:block;margin:0;padding:0;background:#fff;
    height:auto !important;min-height:0 !important;max-height:none !important;overflow:visible !important}
  .paper-sheet{max-width:none;margin:0;border:0;border-radius:0;box-shadow:none;padding:0}
  .paper-q{page-break-inside:avoid;break-inside:avoid}
  .paper-answers{break-before:page;page-break-before:always;border-top:0;margin-top:0;padding-top:0}
  @page{size:A4;margin:15mm}
}

/* ── 반응형 ────────────────────────────────────────────────────── */
@media (max-width:1100px){
  .browse{grid-template-columns:1fr}
  .filter-panel{position:static}
  .fp-block{margin-bottom:12px}
}
@media (max-width:1000px){
  .split-2{grid-template-columns:1fr}
  .stat-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .sidebar{position:fixed;left:0;top:0;bottom:0;z-index:60;transform:translateX(-100%);transition:transform .25s;box-shadow:var(--shadow-lg)}
  body.nav-open .sidebar{transform:none}
  body.nav-open::after{content:"";position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:50}
  .nav-toggle{display:block}
  .content{padding:16px 14px 40px}
  .flash-wrap{padding:12px 14px 0}
  .topbar{padding:12px 14px}
  .card{padding:15px}
  .hero{flex-direction:column;align-items:flex-start}
  .paper-sheet{padding:22px 18px}
  .paper-title{padding:0 10px;font-size:20px}
  .paper-qs.cols2{column-count:1}
  .paper-grid{grid-template-columns:1.6fr .6fr 1fr;font-size:12.5px}
  .paper-grid > *:nth-child(3),.paper-grid > *:nth-child(4){display:none}
}
@media (max-width:520px){
  .stat-grid{grid-template-columns:1fr 1fr}
  .who-role{display:none}
  .logout-btn .lbl{display:none}
}