/* 스스로수학 SelfMath — styles */
:root{
  --indigo:#4f46e5; --violet:#7c3aed; --indigo-dark:#4338ca;
  --bg:#f5f4ff; --card:#ffffff; --ink:#1e1b2e; --muted:#6b6580;
  --line:#e7e4f5; --ok:#16a34a; --ok-bg:#e8f9ee; --no:#dc2626; --no-bg:#fdeaea;
  --warn:#d97706; --warn-bg:#fef4e2;
  --r:18px; --shadow:0 4px 18px rgba(79,70,229,.10);
  --tab-h:64px;
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent;}
html,body{margin:0;padding:0;}
body{
  font-family:'Pretendard Variable',Pretendard,-apple-system,'Apple SD Gothic Neo','Noto Sans KR',sans-serif;
  background:var(--bg); color:var(--ink); font-size:16px; line-height:1.55;
  padding-bottom:calc(var(--tab-h) + env(safe-area-inset-bottom));
}
#topbar{
  position:sticky; top:0; z-index:50; display:flex; align-items:center; justify-content:space-between;
  padding:12px 16px; background:linear-gradient(135deg,var(--indigo),var(--violet)); color:#fff;
  box-shadow:0 2px 12px rgba(79,70,229,.35);
}
.brand{display:flex; align-items:center; gap:10px;}
.brand-logo{
  width:38px;height:38px;border-radius:12px;background:rgba(255,255,255,.22);
  display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;
}
.brand-name{font-weight:800;font-size:18px;white-space:nowrap;}
.brand-name em{font-style:normal;font-weight:500;font-size:12px;opacity:.85;margin-left:4px;}
.icon-btn{
  width:44px;height:44px;border-radius:14px;border:none;background:rgba(255,255,255,.2);
  color:#fff;font-size:20px;cursor:pointer;
}
.icon-btn.lang-btn{font-size:15px;font-weight:800;letter-spacing:.5px;}
#view{max-width:720px;margin:0 auto;padding:16px 14px 24px;min-height:60vh;}
#tabbar{
  position:fixed;left:0;right:0;bottom:0;height:calc(var(--tab-h) + env(safe-area-inset-bottom));
  background:#fff;border-top:1px solid var(--line);display:flex;z-index:50;
  padding-bottom:env(safe-area-inset-bottom);
}
.tab{flex:1;border:none;background:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  color:var(--muted);font-size:11px;font-weight:600;cursor:pointer;min-height:56px;font-family:inherit;}
.tab-ic{font-size:22px;}
.tab.active{color:var(--indigo);}
.tab.active .tab-ic{transform:scale(1.15);}

/* cards & layout */
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;margin-bottom:14px;border:1px solid #f0eefb;}
.card h2{margin:0 0 10px;font-size:18px;}
.card h3{margin:14px 0 8px;font-size:15px;}
.row{display:flex;gap:10px;align-items:center;}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:10px;}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px;}
.muted{color:var(--muted);} .small{font-size:13px;}
.center{text-align:center;} .mb{margin-bottom:14px;}
h1.page{font-size:22px;margin:4px 2px 14px;}
h1.page .sub{display:block;font-size:13px;color:var(--muted);font-weight:500;margin-top:4px;}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:none;border-radius:14px;padding:14px 18px;font-size:16px;font-weight:700;cursor:pointer;
  background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;min-height:52px;
  font-family:inherit;box-shadow:0 4px 14px rgba(79,70,229,.3);
}
.btn:active{transform:scale(.98);}
.btn.block{width:100%;}
.btn.ghost{background:#efedfd;color:var(--indigo);box-shadow:none;}
.btn.soft{background:#fff;color:var(--indigo);border:2px solid var(--line);box-shadow:none;}
.btn.danger{background:var(--no-bg);color:var(--no);box-shadow:none;}
.btn.small{min-height:44px;padding:10px 14px;font-size:14px;border-radius:12px;}
.btn:disabled{opacity:.5;}
select,input[type=text],input[type=number],input[type=date],input[type=password],textarea{
  width:100%;border:2px solid var(--line);border-radius:12px;padding:13px 14px;font-size:16px;
  font-family:inherit;background:#fff;color:var(--ink);min-height:52px;
}
select:focus,input:focus,textarea:focus{outline:none;border-color:var(--indigo);}
label.f{display:block;font-size:14px;font-weight:700;margin:12px 0 6px;}
.chipset{display:flex;flex-wrap:wrap;gap:8px;}
.chip{
  border:2px solid var(--line);background:#fff;border-radius:999px;padding:10px 16px;font-size:14px;
  font-weight:700;color:var(--muted);cursor:pointer;min-height:46px;font-family:inherit;
}
.chip.on{background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;border-color:transparent;}

/* progress */
.pbar{height:10px;background:#eceafa;border-radius:99px;overflow:hidden;}
.pbar > i{display:block;height:100%;background:linear-gradient(90deg,var(--indigo),var(--violet));border-radius:99px;transition:width .4s;}
.ring{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:800;color:var(--indigo);flex:none;
  background:conic-gradient(var(--indigo) var(--p,0%), #eceafa 0);}
.ring > span{background:#fff;width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;}

/* stats */
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;}
.stat{background:#faf9ff;border:1px solid var(--line);border-radius:14px;padding:12px 8px;text-align:center;}
.stat b{display:block;font-size:20px;color:var(--indigo);}
.stat span{font-size:12px;color:var(--muted);font-weight:600;}

/* study */
.qcard{background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:20px;margin-bottom:14px;border:1px solid #f0eefb;}
.qmeta{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px;}
.tag{font-size:12px;font-weight:700;background:#efedfd;color:var(--indigo);border-radius:999px;padding:5px 12px;}
.tag.gray{background:#f1f0f7;color:var(--muted);}
.qprompt{font-size:17px;line-height:1.7;margin:6px 0 16px;}
.qprompt .katex{font-size:1.08em;}
.choices{display:grid;gap:10px;}
.choice{
  text-align:left;border:2px solid var(--line);background:#fff;border-radius:14px;padding:15px 16px;
  font-size:16px;cursor:pointer;min-height:56px;font-family:inherit;display:flex;gap:12px;align-items:flex-start;
}
.choice .k{flex:none;width:30px;height:30px;border-radius:10px;background:#efedfd;color:var(--indigo);
  font-weight:800;display:flex;align-items:center;justify-content:center;font-size:14px;}
.choice.picked{border-color:var(--indigo);background:#f4f2ff;}
.choice.right{border-color:var(--ok);background:var(--ok-bg);}
.choice.wrong{border-color:var(--no);background:var(--no-bg);}
.choice:disabled{cursor:default;opacity:1;}
.feedback{border-radius:14px;padding:16px;margin-top:14px;font-size:15px;}
.feedback.ok{background:var(--ok-bg);border:1px solid #bfe8cc;}
.feedback.no{background:var(--no-bg);border:1px solid #f3c1c1;}
.feedback .big{font-size:20px;font-weight:800;margin-bottom:6px;}
.steps{margin:10px 0 0;padding:0;list-style:none;counter-reset:st;}
.steps li{counter-increment:st;position:relative;padding:8px 0 8px 40px;border-top:1px dashed var(--line);}
.steps li::before{content:counter(st);position:absolute;left:0;top:8px;width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;font-size:13px;font-weight:800;
  display:flex;align-items:center;justify-content:center;}
.why{margin-top:10px;background:#fff;border-radius:12px;padding:12px 14px;border:1px solid var(--line);}
.why b{color:var(--violet);}
.fix{margin-top:10px;background:#fff8ec;border:1px solid #f3d9a4;border-radius:12px;padding:12px 14px;}
.fix b{color:var(--warn);}
.kp{margin-top:10px;background:#f5f3ff;border-radius:12px;padding:12px 14px;}
.kp b{color:var(--violet);display:block;margin-bottom:4px;}
.glossary{margin:6px 0 0;}
.glossary dt{font-weight:800;margin-top:10px;color:#1e1b4b;}
.glossary dd{margin:4px 0 0;color:#444;}
.answer{font-weight:800;color:var(--ok);margin-top:8px;}
.card.deep{background:linear-gradient(135deg,#eef2ff,#f5f3ff);border:1px solid #c7d2fe;}
.photo-preview{max-width:100%;border-radius:12px;margin-top:10px;border:1px solid var(--line);}
.banner{background:linear-gradient(135deg,#fef3c7,#fde68a);border-radius:14px;padding:14px 16px;margin:12px 0;
  font-weight:700;color:#92400e;border:1px solid #f5cf6b;}
.notice{background:#eef2ff;border-radius:14px;padding:14px 16px;margin:12px 0;color:#3730a3;font-size:14px;}
.notice.warn{background:#fff8ec;border:1px solid #f3d9a4;color:#92400e;}

/* error book */
.err-item{border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:10px;background:#fff;}
.err-item.resolved{opacity:.65;}
.err-top{display:flex;justify-content:space-between;align-items:flex-start;gap:8px;margin-bottom:6px;}
.badge{font-size:11px;font-weight:800;border-radius:999px;padding:4px 10px;background:var(--warn-bg);color:var(--warn);}
.badge.red{background:var(--no-bg);color:var(--no);}
.badge.green{background:var(--ok-bg);color:var(--ok);}
.badge.blue{background:#e0eaff;color:#1d4ed8;}
.err-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px;}

/* weak cards */
.weak-card{border-left:5px solid var(--violet);}

/* planner */
.plan{border:1px solid var(--line);border-radius:14px;padding:14px;margin-bottom:10px;}
.daydots{display:flex;gap:4px;margin-top:8px;flex-wrap:wrap;}
.daydot{width:26px;height:26px;border-radius:8px;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;background:#eceafa;color:var(--muted);}
.daydot.done{background:var(--ok);color:#fff;}
.daydot.today{outline:2px solid var(--indigo);}

/* parent lock */
.lockwrap{max-width:360px;margin:40px auto;text-align:center;}
.pinpad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0;}
.pinpad button{height:60px;font-size:22px;border-radius:16px;border:2px solid var(--line);background:#fff;cursor:pointer;font-family:inherit;}
.pin-dots{font-size:28px;letter-spacing:10px;margin:10px 0;min-height:40px;}

/* worksheet print */
#print-root{display:none;}
@media print{
  body{padding:0;background:#fff;}
  #app{display:none;}
  #print-root{display:block;color:#000;}
  .ws-page{page-break-after:always;padding:8px;}
  .ws-page:last-child{page-break-after:auto;}
  .ws-h{border-bottom:2px solid #000;padding-bottom:8px;margin-bottom:12px;}
  .ws-q{margin-bottom:14px;font-size:13px;line-height:1.6;}
  .ws-q .qn{font-weight:800;margin-right:6px;}
  .ws-ans{font-size:12px;margin-bottom:8px;}
  .katex{font-size:1em;}
}

/* misc */
.divider{height:1px;background:var(--line);margin:14px 0;}
.kv{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px dashed var(--line);font-size:14px;}
.kv:last-child{border-bottom:none;}
.toast{
  position:fixed;left:50%;bottom:calc(var(--tab-h) + 18px);transform:translateX(-50%);
  background:#1e1b2e;color:#fff;padding:12px 20px;border-radius:999px;font-size:14px;font-weight:600;
  z-index:200;box-shadow:0 6px 20px rgba(0,0,0,.25);max-width:90vw;text-align:center;
}
.hidden{display:none !important;}
.photo-thumb{width:72px;height:72px;object-fit:cover;border-radius:10px;border:1px solid var(--line);}
details.sol{margin-top:10px;}
details.sol summary{cursor:pointer;font-weight:700;color:var(--indigo);padding:10px 0;}
textarea.code{font-family:ui-monospace,monospace;font-size:12px;min-height:110px;}
.list-item{display:flex;gap:12px;align-items:center;padding:12px 4px;border-bottom:1px dashed var(--line);}
.list-item:last-child{border-bottom:none;}
.accordion{border:1px solid var(--line);border-radius:14px;margin-bottom:10px;overflow:hidden;background:#fff;}
.accordion > summary{padding:14px 16px;cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:8px;}
.accordion > summary::-webkit-details-marker{display:none;}
.accordion .acc-body{padding:0 16px 16px;border-top:1px dashed var(--line);}
.streak-fire{font-size:34px;}
.checkline{display:flex;gap:10px;align-items:flex-start;padding:8px 0;font-size:14px;}
.checkline input{width:24px;height:24px;flex:none;margin:0;min-height:0;}
@media (min-width:760px){
  .stat-grid{grid-template-columns:repeat(3,1fr);}
  #view{padding:22px 18px 32px;}
}

/* 과목 전환 세그먼트 */
.subj-seg{display:flex;background:rgba(255,255,255,.18);border-radius:999px;padding:3px;gap:2px;}
.subj-seg button{border:0;background:transparent;padding:6px 9px;border-radius:999px;font-size:12.5px;font-weight:700;color:#fff;cursor:pointer;font-family:inherit;opacity:.75;white-space:nowrap;}
.subj-seg button.on{background:#fff;color:var(--indigo);opacity:1;}
@media (max-width:560px){
  #topbar{flex-wrap:wrap;row-gap:10px;}
  .brand-name em{display:none;}
  .subj-seg{order:3;flex:1 1 100%;overflow-x:auto;}
  .subj-seg button{padding:6px 7px;font-size:11.5px;}
}
/* 독해 지문 */
.passage-title{font-weight:800;margin:4px 0 8px;font-size:16px;}
.passage{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin:10px 0;line-height:1.75;font-size:15px;}
/* 레슨 예문 */
.ex{background:#f8fafc;border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-bottom:8px;}
/* 실전 세트 타이머 */
.q-timer{font-weight:800;color:#0f766e;background:#ccfbf1;border-radius:8px;padding:2px 10px;font-size:14px;}
.q-timer.urgent{color:#b91c1c;background:#fee2e2;}