/* =========================================================
   PS Log — coding-test review tracker
   Aesthetic: online-judge verdict colors + spaced-repetition rhythm
   ========================================================= */

:root{
  --bg:#e4e7f0;
  --surface:#ffffff;
  --surface-2:#f2f4f8;
  --ink:#161a26;
  --ink-soft:#5b6276;
  --ink-faint:#7d859b;
  --line:#d7dce8;
  --line-strong:#c2cada;

  --accent:#4f46e5;
  --accent-press:#4038c9;
  --accent-soft:#ecebfd;

  /* verdict colors */
  --solved:#0f9d63;   --solved-soft:#e2f4ec;
  --due:#b9750a;      --due-soft:#faefd7;
  --overdue:#cf3a22;  --overdue-soft:#fbe7e2;
  --pending:#8b91a4;  --pending-soft:#eef0f5;

  --radius:14px;
  --radius-sm:9px;
  --shadow:0 1px 3px rgba(20,26,44,.08), 0 8px 24px rgba(20,26,44,.075);
  --shadow-soft:0 1px 3px rgba(20,26,44,.08), 0 4px 12px rgba(20,26,44,.04);

  --ui:'Inter','Pretendard',-apple-system,BlinkMacSystemFont,'Segoe UI','Apple SD Gothic Neo','Malgun Gothic',sans-serif;
  --mono:'JetBrains Mono','SFMono-Regular',ui-monospace,Menlo,Consolas,monospace;
}

/* 밝은 모니터에서 카드와 입력 영역의 경계가 날아갈 때 사용하는 기기별 고대비 모드 */
:root[data-contrast="high"]{
  --bg:#d9deea;
  --surface-2:#eceff5;
  --ink-soft:#485166;
  --ink-faint:#687289;
  --line:#c8cfdd;
  --line-strong:#adb7ca;
  --shadow:0 2px 4px rgba(20,26,44,.11), 0 10px 28px rgba(20,26,44,.10);
  --shadow-soft:0 1px 3px rgba(20,26,44,.11), 0 5px 14px rgba(20,26,44,.055);
}

*{box-sizing:border-box}
html{scrollbar-gutter:stable}
html,body{margin:0;padding:0}
/* [hidden]의 display:none은 브라우저 기본 스타일이라 아래의 .concept-empty{display:flex}
   같은 선언에 밀린다. 숨기라고 한 건 확실히 숨긴다. */
[hidden]{display:none!important}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--ui);
  font-size:15px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* 탭을 바꿔도 상단바와 본문 폭이 흔들리지 않도록 개념 화면 폭으로 고정한다. */
.app{max-width:1560px;margin:0 auto;padding:0 20px 80px}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:20;
  display:flex;align-items:center;gap:18px;
  padding:14px 0;margin-bottom:6px;
  background:var(--bg);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:11px;min-width:0}
.brand-mark{
  display:block;width:36px;height:36px;object-fit:contain;flex-shrink:0;
  border-radius:10px;filter:drop-shadow(0 2px 2px rgba(37,99,235,.18));
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:16px;letter-spacing:-.2px}
.brand-text span{font-size:11.5px;color:var(--ink-faint)}

.tabs{display:flex;gap:2px;margin-left:8px;background:var(--surface-2);padding:3px;border-radius:11px;border:1px solid var(--line)}
.tab{
  border:0;background:transparent;color:var(--ink-soft);
  padding:7px 16px;border-radius:8px;font-weight:600;font-size:14px;cursor:pointer;
}
.tab.is-active{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-soft)}

.topbar-actions{display:flex;gap:8px;margin-left:auto}

/* ---------- buttons ---------- */
.btn{
  border:1px solid var(--accent);background:var(--accent);color:#fff;
  padding:8px 15px;border-radius:10px;font-weight:600;font-size:14px;cursor:pointer;
  transition:transform .06s ease, background .15s ease;
}
.btn:hover{background:var(--accent-press);border-color:var(--accent-press)}
.btn:active{transform:translateY(1px)}
.btn.ghost{background:var(--surface);color:var(--ink-soft);border-color:var(--line-strong)}
.btn.ghost:hover{background:var(--surface-2);color:var(--ink)}
.btn.ghost.danger{color:var(--overdue);border-color:#eccbc4}
.btn.ghost.danger:hover{background:var(--overdue-soft)}
.btn.mail{background:var(--solved);border-color:var(--solved)}
.btn.mail:hover{background:#0c8253;border-color:#0c8253}
.btn.small{padding:6px 12px;font-size:13px;border-radius:9px}
.btn.full{width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed}

/* ---------- review hero ---------- */
.review-hero{
  background:linear-gradient(160deg,#1c2030,#232a44);
  color:#fff;border-radius:20px;padding:22px 24px;margin:14px 0 22px;
  box-shadow:var(--shadow);
}
.review-hero-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:16px;flex-wrap:wrap}
.eyebrow{margin:0 0 4px;font-size:12px;letter-spacing:.4px;text-transform:uppercase;color:#a9b0cc;font-weight:600}
.eyebrow span{font-family:var(--mono);text-transform:none;letter-spacing:0}
#reviewTitle{margin:0;font-size:26px;letter-spacing:-.5px;font-weight:700}

.review-queue{display:flex;flex-direction:column;gap:9px}
.rq-empty{color:#9aa1bd;font-size:14px;padding:10px 2px}
.rq-item{
  display:flex;align-items:center;gap:14px;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.09);
  padding:12px 14px;border-radius:12px;
}
.rq-item .rq-main{min-width:0;flex:1}
.rq-item .rq-line{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.rq-num{font-family:var(--mono);font-size:13px;color:#c5cbe6;font-weight:600}
.rq-title{font-weight:600;color:#fff;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rq-sub{font-size:12px;color:#9aa1bd;margin-top:2px}
.stage-tag{
  font-family:var(--mono);font-size:11px;font-weight:700;padding:3px 7px;border-radius:6px;
  background:var(--due-soft);color:var(--due);
}
.stage-tag.overdue{background:var(--overdue-soft);color:var(--overdue)}
.rq-item .btn{white-space:nowrap}

/* ---------- panels / form ---------- */
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);margin-bottom:18px;box-shadow:var(--shadow-soft)}
.panel-toggle{
  width:100%;text-align:left;border:0;background:transparent;cursor:pointer;
  padding:15px 18px;font-weight:600;font-size:15px;color:var(--ink);
  display:flex;align-items:center;gap:8px;
}
.panel-toggle .plus{color:var(--accent);font-size:18px;line-height:1}
.prob-form{padding:2px 18px 18px;border-top:1px solid var(--line)}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-top:14px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field.wide{grid-column:span 2}
.field.solution-code-field{grid-column:1/-1}
.field>span{font-size:12.5px;font-weight:600;color:var(--ink-soft)}
.field input,.field select,.search,.c-title,.c-tags,.dlg input{
  border:1px solid var(--line-strong);border-radius:9px;padding:9px 11px;font-size:14px;
  background:var(--surface);color:var(--ink);width:100%;font-family:inherit;
}
.field input:focus,.field select:focus,.search:focus,textarea:focus,.c-title:focus,.c-tags:focus,.dlg input:focus{
  outline:2px solid var(--accent-soft);outline-offset:0;border-color:var(--accent);
}
.field input::placeholder,textarea::placeholder{color:var(--ink-faint)}
.solution-code-input{
  width:100%;min-height:220px;resize:vertical;border:1px solid var(--line-strong);border-radius:10px;
  padding:13px 14px;background:var(--surface-2);color:var(--ink);font-family:var(--mono);font-size:13px;line-height:1.55;
  tab-size:4;
}

.seg{display:flex;background:var(--surface-2);border:1px solid var(--line-strong);border-radius:9px;padding:3px;gap:3px}
.seg-btn{flex:1;border:0;background:transparent;padding:7px;border-radius:6px;font-weight:600;font-size:13.5px;color:var(--ink-soft);cursor:pointer}
.seg-btn.is-on[data-val="success"]{background:var(--solved);color:#fff}
.seg-btn.is-on[data-val="fail"]{background:var(--overdue);color:#fff}

.form-hint{font-size:12.5px;color:var(--ink-soft);margin:14px 0 0}
.form-hint b{color:var(--due)}
.form-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px}

/* ---------- list bar ---------- */
.listbar{display:flex;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid var(--line-strong);background:var(--surface);color:var(--ink-soft);padding:6px 13px;border-radius:20px;font-size:13px;font-weight:600;cursor:pointer}
.chip.is-active{background:var(--ink);color:#fff;border-color:var(--ink)}
.listbar .search{margin-left:auto;max-width:220px}

/* ---------- problem list ---------- */
.prob-list{display:flex;flex-direction:column;gap:10px}
.prob{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:15px 17px;box-shadow:var(--shadow-soft);
  display:grid;grid-template-columns:1fr auto;gap:12px 18px;align-items:center;
}
.prob-left{min-width:0}
.prob-top{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-bottom:5px}
.verdict{
  font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.3px;
  padding:3px 7px;border-radius:6px;
}
.verdict.solved{background:var(--solved-soft);color:var(--solved)}
.verdict.review{background:var(--due-soft);color:var(--due)}
.verdict.overdue{background:var(--overdue-soft);color:var(--overdue)}
.verdict.mastered{background:var(--accent-soft);color:var(--accent)}
.p-num{font-family:var(--mono);font-size:13px;color:var(--ink-faint);font-weight:600}
.p-title{font-weight:600;font-size:15.5px;letter-spacing:-.2px}
.p-title a{color:var(--ink)}
.p-title a:hover{color:var(--accent)}
.p-meta{display:flex;gap:7px;flex-wrap:wrap;font-size:12.5px;color:var(--ink-soft);align-items:center;margin-top:3px}
.p-meta .dot{color:var(--line-strong)}
.p-tier{font-weight:600;color:var(--ink)}
.p-note{font-size:12.5px;color:var(--ink-faint);margin-top:6px;font-style:italic}

.prob-right{display:flex;flex-direction:column;align-items:flex-end;gap:10px}

/* review track = signature element */
.track{display:flex;align-items:center;gap:7px}
.track-node{display:flex;flex-direction:column;align-items:center;gap:4px;width:38px}
.track-dot{
  width:26px;height:26px;border-radius:50%;
  border:2px solid var(--line-strong);background:var(--surface);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-size:11px;font-weight:700;color:var(--pending);cursor:default;
}
.track-dot.done{background:var(--solved);border-color:var(--solved);color:#fff}
.track-dot.due{background:var(--due-soft);border-color:var(--due);color:var(--due)}
.track-dot.overdue{background:var(--overdue-soft);border-color:var(--overdue);color:var(--overdue)}
.track-dot.is-actionable{cursor:pointer;animation:pulse 1.8s ease-in-out infinite}
.track-dot.is-actionable:hover,.track-dot.is-actionable:focus-visible{transform:scale(1.08);outline:2px solid var(--accent);outline-offset:2px}
.track-label{font-size:10px;color:var(--ink-faint);font-weight:600}
.track-line{width:14px;height:2px;background:var(--line-strong);margin-bottom:16px}
.track-line.filled{background:var(--solved)}

@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(207,58,34,.35)}50%{box-shadow:0 0 0 5px rgba(207,58,34,0)}}

.prob-actions{display:flex;gap:6px}
.icon-btn{border:1px solid var(--line-strong);background:var(--surface);color:var(--ink-soft);border-radius:8px;padding:5px 9px;font-size:12.5px;font-weight:600;cursor:pointer;text-decoration:none}
.icon-btn:hover{background:var(--surface-2);color:var(--ink)}
.icon-btn.danger:hover{background:var(--overdue-soft);color:var(--overdue);border-color:#eccbc4}

.empty{text-align:center;color:var(--ink-faint);padding:46px 10px;font-size:14px}

/* ---------- problem site shortcuts ---------- */
.quick-sites{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;margin:-4px 0 18px;box-shadow:var(--shadow-soft)}
.quick-sites-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.quick-sites-head .eyebrow{color:var(--ink-faint);margin-bottom:0}
.quick-sites-head h2{margin:0;font-size:16px;letter-spacing:-.25px}
.quick-site-list{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.quick-site{display:flex;align-items:center;border:1px solid var(--line-strong);background:var(--surface-2);border-radius:10px;overflow:hidden}
.quick-site a{padding:7px 5px 7px 11px;font-size:13px;font-weight:700;color:var(--ink)}
.quick-site a:hover{color:var(--accent);text-decoration:none}
.quick-site button{border:0;background:transparent;color:var(--ink-faint);padding:7px 9px 7px 5px;cursor:pointer;font-size:15px}
.quick-site button:hover{color:var(--overdue)}
.quick-sites-empty{margin:10px 0 0;font-size:13px;color:var(--ink-faint)}
.quick-site-form{display:grid;grid-template-columns:minmax(120px,.6fr) minmax(220px,1.4fr) auto auto;gap:8px;margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}
.quick-site-form input{border:1px solid var(--line-strong);border-radius:9px;padding:8px 10px;font:inherit;font-size:13px;min-width:0}
.quick-site-form input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}

/* ---------- concepts ---------- */
/* 에디터가 화면 높이를 꽉 채우도록 기준 높이를 하나로 관리한다. */
:root{--pane-h:calc(100vh - 118px)}
.concepts-layout{display:grid;grid-template-columns:280px minmax(560px,1fr) 330px;gap:16px;margin-top:16px;align-items:start}
.concept-side{display:flex;flex-direction:column;gap:10px;position:sticky;top:74px;max-height:var(--pane-h);min-width:0}
.concept-list{display:flex;flex-direction:column;gap:6px;margin-top:2px;overflow-y:auto;min-height:0;padding-right:2px}
.concept-tools{display:grid;grid-template-columns:1fr 1fr;gap:6px}

/* 언어별로 노트를 나눠 보는 탭 */
.lang-tabs{display:grid;grid-template-columns:repeat(auto-fit,minmax(58px,1fr));gap:3px;background:var(--surface-2);border:1px solid var(--line);border-radius:11px;padding:3px}
.lang-tab{
  border:0;background:transparent;color:var(--ink-soft);cursor:pointer;
  padding:7px 4px;border-radius:8px;font-weight:700;font-size:12.5px;
  display:flex;align-items:center;justify-content:center;gap:4px;min-width:0;white-space:nowrap;
}
.lang-tab[data-lang="portfolio"]{padding-inline:2px;gap:2px;font-size:11.5px;letter-spacing:-.4px}
.lang-tab:hover{color:var(--ink)}
.lang-tab.is-on{background:var(--surface);color:var(--ink);box-shadow:var(--shadow-soft)}
.lang-count{
  font-family:var(--mono);font-size:10px;font-weight:700;color:var(--ink-faint);
  background:var(--surface);border-radius:5px;padding:0 4px;line-height:15px;flex-shrink:0;
}
.lang-count:empty{display:none}
.lang-tab.is-on .lang-count{background:var(--accent-soft);color:var(--accent)}
.category-tools{display:grid;grid-template-columns:1.1fr 1fr .7fr;gap:5px}
.category-tools .btn{padding-inline:5px;font-size:11px}
.concept-tag-filter{padding:9px;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
.concept-tag-filter-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:7px;color:var(--ink-soft);font-size:11.5px}
.concept-tag-filter-head span{font:700 10.5px var(--mono);color:var(--ink-faint)}
.concept-tag-filter-list{display:flex;gap:5px;flex-wrap:wrap;max-height:92px;overflow-y:auto}
.concept-tag-filter-list:empty::after{content:'저장된 태그가 없어요';color:var(--ink-faint);font-size:11px}
.concept-tag-chip{display:inline-flex;align-items:center;gap:4px;max-width:100%;border:1px solid var(--line);border-radius:999px;background:var(--surface-2);color:var(--ink-soft);padding:4px 7px;cursor:pointer;font-size:11px;font-weight:700}
.concept-tag-chip:hover{border-color:var(--accent);color:var(--accent)}
.concept-tag-chip.is-active{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.concept-tag-chip span{font:700 9.5px var(--mono);opacity:.72}
.c-lang{
  border:1px solid var(--line-strong);border-radius:9px;padding:6px 8px;
  font-size:13px;font-weight:600;font-family:inherit;
  background:var(--surface);color:var(--ink-soft);cursor:pointer;
}
.concept-item{
  text-align:left;border:1px solid var(--line);background:var(--surface);border-radius:10px;
  padding:11px 13px;cursor:pointer;box-shadow:var(--shadow-soft);
  width:calc(100% - var(--tree-depth,0) * 14px);margin-left:calc(var(--tree-depth,0) * 14px);
}
.concept-item:hover{border-color:var(--line-strong)}
.concept-item.is-active{border-color:var(--accent);background:var(--accent-soft)}
.concept-tree-note[draggable="true"]{cursor:grab}
.concept-tree-note[draggable="true"]:active{cursor:grabbing}
.concept-tree-note.is-dragging{opacity:.42;transform:scale(.98)}
.concept-item b{display:block;font-size:14px;letter-spacing:-.2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.concept-item span{font-size:11.5px;color:var(--ink-faint)}
.ci-tags{margin-top:5px;display:flex;gap:4px;flex-wrap:wrap}
.ci-tag{font-size:10.5px;background:var(--surface-2);border:1px solid var(--line);color:var(--ink-soft);padding:1px 6px;border-radius:5px}
.folder-node{min-width:0}
.folder-row{display:flex;align-items:center;gap:4px;min-height:42px;padding:5px 7px 5px calc(7px + var(--tree-depth,0) * 14px);border:1px solid var(--line);border-radius:10px;background:var(--surface);box-shadow:var(--shadow-soft)}
.folder-row:hover{background:var(--surface);border-color:var(--line-strong)}
.folder-row[draggable="true"]{cursor:grab}
.folder-row[draggable="true"]:active{cursor:grabbing}
.folder-row.is-dragging{opacity:.42;transform:scale(.98)}
.concept-list.is-dragging-note .folder-row[data-drop-folder],
.concept-list.is-dragging-note .unfiled-group[data-drop-folder]{outline:1px dashed var(--accent);outline-offset:-2px}
.concept-list.is-dragging-folder .folder-row[data-folder-id]{outline:1px dashed var(--accent);outline-offset:-2px}
.folder-row.is-drop-target,.unfiled-group.is-drop-target,.folder-root-drop.is-drop-target{background:var(--accent-soft);outline:2px solid var(--accent)!important;outline-offset:-2px}
.concept-item.is-drop-before,.folder-row.is-drop-before{box-shadow:0 -3px 0 var(--accent),var(--shadow-soft)}
.concept-item.is-drop-after,.folder-row.is-drop-after{box-shadow:0 3px 0 var(--accent),var(--shadow-soft)}
.concept-item.is-drop-inside,.folder-row.is-drop-inside,.unfiled-group.is-drop-inside,.folder-root-drop.is-drop-inside{background:var(--accent-soft);outline:2px solid var(--accent)!important;outline-offset:-2px}
.folder-toggle,.folder-name,.folder-actions button{border:0;background:transparent;color:var(--ink-soft);cursor:pointer}
.folder-toggle{width:22px;padding:4px 2px;font-size:12px;flex-shrink:0}
.folder-name{font-weight:700;text-align:left;padding:5px 2px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1}
.folder-count{min-width:22px;padding:0 6px;border:1px solid var(--line);border-radius:7px;background:var(--surface-2);font:800 12px/20px var(--mono);color:var(--ink-soft);text-align:center;flex-shrink:0}
.folder-count:empty{display:none}
.folder-actions{display:flex;opacity:0}
.folder-row:hover .folder-actions,.folder-row:focus-within .folder-actions{opacity:1}
.folder-actions button{padding:4px;font-size:12px;border-radius:5px}
.folder-actions button:hover{background:var(--line);color:var(--ink)}
.folder-children{display:flex;flex-direction:column;gap:5px;margin-top:4px}
.folder-root-drop{display:none;align-items:center;justify-content:center;min-height:38px;margin-bottom:6px;border:1px dashed var(--accent);border-radius:10px;background:var(--surface);color:var(--accent);font-size:12px;font-weight:800}
.concept-list.is-dragging-folder .folder-root-drop{display:flex}
.unfiled-group{display:flex;flex-direction:column;gap:5px;min-height:34px;margin-top:5px;padding:7px 0 2px;border-top:1px solid var(--line);border-radius:8px}
.unfiled-label{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:11px;font-weight:700;color:var(--ink-faint);padding:2px 7px}
.unfiled-drop-hint{display:none;font-size:10px;font-weight:600;color:var(--accent)}
.concept-list.is-dragging-note .unfiled-drop-hint{display:inline}

.concept-main{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);min-width:0;min-height:var(--pane-h);box-shadow:var(--shadow-soft)}
.concept-empty{display:flex;align-items:center;justify-content:center;height:var(--pane-h);color:var(--ink-faint);text-align:center;line-height:1.7}
/* 세로는 flex로 나눠 갖는다 — 입력/미리보기가 남는 높이를 전부 먹는다 */
.concept-editor{padding:18px;display:flex;flex-direction:column;height:var(--pane-h)}
/* 좁은 화면에선 제목이 뭉개지지 않게 버튼 줄이 아래로 내려간다 */
.editor-head{display:flex;gap:10px;align-items:center;margin-bottom:10px;flex-wrap:wrap}
.c-title{font-size:17px;font-weight:700;flex:1 1 220px;min-width:0}
.editor-head-actions{display:flex;gap:6px;margin-left:auto;flex-shrink:0}
.c-tags{margin-bottom:8px}
.editor-formatbar{
  display:flex;align-items:center;gap:5px;flex-wrap:wrap;margin-bottom:8px;
  padding:6px 8px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2);
}
.fmt-btn{
  min-width:30px;height:29px;border:1px solid var(--line);border-radius:7px;background:var(--surface);
  color:var(--ink);font-family:inherit;font-size:13px;font-weight:700;cursor:pointer;padding:0 8px;
}
.fmt-btn:hover{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.fmt-bold{font-weight:900}.fmt-italic{font-style:italic}.fmt-underline{text-decoration:underline}
.fmt-script{font-family:var(--mono);font-weight:700}.fmt-script sup,.fmt-script sub{font-size:.7em}
.fmt-apply{font-size:11.5px;font-weight:700;color:var(--ink-soft)}
.fmt-divider{height:22px;width:1px;background:var(--line);margin:0 2px}
.fmt-color-field{display:flex;align-items:center;gap:4px;font-size:11.5px;font-weight:700;color:var(--ink-soft)}
.fmt-color-field select{
  height:29px;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--ink);
  font-family:inherit;font-size:11.5px;padding:0 23px 0 7px;cursor:pointer;
}
.fmt-shortcut{margin-left:auto;font-size:10.5px;color:var(--ink-faint);white-space:nowrap}
.editor-split{display:grid;grid-template-columns:1fr 1fr;gap:14px;flex:1;min-height:0}
.concept-editor.is-preview-only .editor-split{grid-template-columns:minmax(0,1fr)}
.concept-editor.is-preview-only .c-body{display:none}
.c-body{
  border:1px solid var(--line-strong);border-radius:10px;padding:15px 16px;resize:none;
  font-family:var(--mono);font-size:13.5px;line-height:1.65;color:var(--ink);background:var(--surface-2);
  min-height:0;height:100%;
}
.c-preview{border:1px solid var(--line);border-radius:10px;padding:16px 20px;overflow:auto;background:var(--surface);min-height:0;height:100%}
.save-state{font-size:12px;color:var(--ink-faint);margin:9px 2px 0;height:14px}

/* 개념 화면의 AI 대화는 서버나 data.json에 저장하지 않고 현재 탭 메모리에만 둔다. */
.concept-ai{
  position:sticky;top:74px;height:var(--pane-h);display:flex;flex-direction:column;min-width:0;
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-soft);
  overflow:hidden;
}
.ai-chat-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:15px 15px 12px;border-bottom:1px solid var(--line)}
.ai-chat-head h2{font-size:16px;line-height:1.2;margin:2px 0 0;letter-spacing:-.2px}
.ai-chat-kicker{font:800 9.5px var(--mono);letter-spacing:.12em;color:var(--accent)}
.ai-chat-head .btn{padding:6px 9px;font-size:11px;white-space:nowrap}
.ai-chat-context{display:flex;align-items:center;gap:7px;min-width:0;padding:9px 14px;background:var(--surface-2);border-bottom:1px solid var(--line);font-size:11px;color:var(--ink-faint)}
.ai-chat-context strong{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--ink-soft)}
.ai-chat-messages{flex:1;min-height:0;overflow-y:auto;padding:13px;display:flex;flex-direction:column;gap:10px;scrollbar-gutter:stable}
.ai-chat-empty{margin:auto;padding:24px 14px;color:var(--ink-faint);font-size:12.5px;line-height:1.7;text-align:center}
.ai-message{max-width:92%;font-size:12.5px;line-height:1.65}
.ai-message strong{display:block;margin:0 4px 3px;font-size:10px;color:var(--ink-faint)}
.ai-message-body{padding:9px 11px;border:1px solid var(--line);border-radius:11px;background:var(--surface-2);color:var(--ink);white-space:pre-wrap;overflow-wrap:anywhere}
.ai-message.is-user{align-self:flex-end}
.ai-message.is-user strong{text-align:right}
.ai-message.is-user .ai-message-body{border-color:#cbc7fb;background:var(--accent-soft)}
.ai-message.is-assistant{align-self:flex-start}
.ai-chat-form{padding:11px 12px 9px;border-top:1px solid var(--line);background:var(--surface)}
.ai-chat-form textarea{display:block;width:100%;min-height:84px;max-height:180px;resize:vertical;border:1px solid var(--line-strong);border-radius:10px;background:var(--surface-2);color:var(--ink);font:12.5px/1.55 var(--ui);padding:10px 11px}
.ai-chat-form textarea:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.ai-chat-form textarea:disabled{opacity:.65;cursor:not-allowed}
.ai-chat-form-foot{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:7px}
.ai-chat-form-foot span{font-size:9.5px;color:var(--ink-faint)}
.ai-chat-form-foot .btn{padding:6px 12px;font-size:11.5px}
.ai-chat-status{min-height:18px;margin:0;padding:0 13px 5px;font-size:10.5px;color:var(--ink-faint)}
.ai-chat-status[data-kind="ready"]{color:var(--solved)}
.ai-chat-status[data-kind="error"]{color:var(--overdue)}
.ai-chat-status[data-kind="loading"]{color:var(--accent)}
.ai-chat-privacy{margin:0;padding:0 13px 12px;font-size:9.5px;line-height:1.45;color:var(--ink-faint)}
.concept-ai[data-configured="false"] .ai-chat-form{opacity:.72}
.concept-ai.is-loading .ai-chat-messages::after{content:'●  ●  ●';align-self:flex-start;color:var(--accent);font:700 10px var(--mono);letter-spacing:3px;padding:4px 8px}

/* markdown */
.md{font-size:14px;line-height:1.7;color:var(--ink)}
.md p,.md blockquote{white-space:break-spaces}
.md h1,.md h2,.md h3,.md h4,.md h5,.md h6{letter-spacing:-.3px;margin:1.1em 0 .5em;line-height:1.3}
.md h1{font-size:1.5em;border-bottom:1px solid var(--line);padding-bottom:.25em}
.md h2{font-size:1.25em}
.md h3{font-size:1.08em}
.md h4{font-size:1em}.md h5{font-size:.94em}.md h6{font-size:.88em;color:var(--ink-soft)}
.md p{margin:.6em 0}
.md ul,.md ol{margin:.5em 0;padding-left:1.55em}
.md li{margin:.2em 0}
.md li>p{margin:.2em 0}
.md li>ul,.md li>ol{margin:.15em 0}
.md ul.contains-task-list{padding-left:.2em;list-style:none}
.md .task-list-item{list-style:none}
.md .task-list-item-checkbox{margin:0 7px 0 0;accent-color:var(--solved)}
.md a{color:var(--accent)}
.md code{font-family:var(--mono);font-size:.88em;background:var(--surface-2);border:1px solid var(--line);padding:1px 5px;border-radius:5px}
.md pre{background:#1c2030;color:#e6e8f2;padding:13px 15px;border-radius:10px;overflow:auto;margin:.7em 0}
.md pre code{background:none;border:0;color:inherit;padding:0;font-size:12.8px}
.md .token.comment,.md .token.prolog,.md .token.doctype,.md .token.cdata{color:#8292a2;font-style:italic}
.md .token.punctuation{color:#f8f8f2}
.md .token.namespace{opacity:.75}
.md .token.property,.md .token.tag,.md .token.constant,.md .token.symbol,.md .token.deleted{color:#f92672}
.md .token.boolean,.md .token.number{color:#ae81ff}
.md .token.selector,.md .token.attr-name,.md .token.string,.md .token.char,.md .token.builtin,.md .token.inserted{color:#a6e22e}
.md .token.operator,.md .token.entity,.md .token.url,.md .language-css .token.string,.md .style .token.string,.md .token.variable{color:#f8f8f2}
.md .token.atrule,.md .token.attr-value,.md .token.function,.md .token.class-name{color:#e6db74}
.md .token.keyword{color:#66d9ef;font-weight:600}
.md .token.regex,.md .token.important{color:#fd971f}
.md .token.important,.md .token.bold{font-weight:700}.md .token.italic{font-style:italic}
.md .md-hl{padding:.06em .16em;border-radius:.2em;color:inherit;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.md .md-hl-yellow{background:#fff176}.md .md-hl-green{background:#a7f3b4}
.md .md-hl-blue{background:#a9dcff}.md .md-hl-purple{background:#d8b4fe}.md .md-hl-pink{background:#f9a8d4}

.app-version{position:fixed;right:12px;bottom:10px;z-index:40;padding:4px 8px;border:1px solid color-mix(in srgb,var(--line) 78%,transparent);border-radius:999px;background:color-mix(in srgb,var(--panel) 88%,transparent);color:var(--muted);font-size:11px;font-variant-numeric:tabular-nums;line-height:1;box-shadow:0 2px 10px rgba(15,23,42,.08);backdrop-filter:blur(6px);user-select:none}
.md .md-color-red{color:#dc2626}.md .md-color-blue{color:#2563eb}.md .md-color-black{color:#111827}
.md blockquote{border-left:3px solid var(--accent);margin:.7em 0;padding:.2em 0 .2em 14px;color:var(--ink-soft)}
.md blockquote blockquote{margin-left:5px;border-left-color:var(--line-strong)}
.md img{max-width:100%;border-radius:10px;border:1px solid var(--line);margin:.5em 0}
.md table{display:block;width:100%;overflow-x:auto;border-collapse:collapse;margin:.8em 0;font-size:13px}
.md th,.md td{border:1px solid var(--line-strong);padding:7px 10px;text-align:left;white-space:nowrap}
.md th{background:var(--surface-2);font-weight:700}
.md del{color:var(--ink-faint)}
.md details{border:1px solid var(--line);border-radius:9px;padding:8px 11px;margin:.7em 0}
.md summary{font-weight:700;cursor:pointer}
.md-placeholder{color:var(--ink-faint)}
.md-img-missing{
  display:inline-block;font-size:12.5px;font-weight:600;color:var(--ink-faint);
  background:var(--surface-2);border:1px dashed var(--line-strong);border-radius:8px;padding:6px 10px;
}
/* http(s)·mailto가 아닌 주소는 링크로 만들지 않고 이 표시만 남긴다 */
.md-link-blocked{
  display:inline-block;margin-left:6px;font-size:11.5px;font-weight:700;
  color:var(--overdue);background:var(--surface-2);border:1px dashed var(--overdue);
  border-radius:6px;padding:1px 6px;vertical-align:middle;
}
.md hr{border:0;border-top:1px solid var(--line);margin:1.2em 0}
.md strong{font-weight:700}

/* ---------- 기록 잔디 (contribution heatmap) ---------- */
:root{
  --hm-empty:#e6e9f2;
  --hm-g1:#9be9a8;  --hm-g2:#1c8a53;   /* 새 문제: 연한 / 진한 초록 */
  --hm-b1:#a5dcfa;  --hm-b2:#1a72c4;   /* 복습:   연한 / 진한 하늘 */
}
.heatmap-panel{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 18px;margin:14px 0 18px;box-shadow:var(--shadow-soft);
}
.heatmap-panel .eyebrow{color:var(--ink-faint);margin-bottom:2px}
/* 머리말을 달력 위가 아니라 옆에 두어 패널이 세로로 길어지지 않게 한다 */
.hm-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.hm-title{margin:0;font-size:17px;font-weight:700;letter-spacing:-.3px}
.hm-nav{display:flex;gap:6px}
.hm-legend{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:7px 14px;font-size:11.5px;color:var(--ink-soft);font-weight:600}
.hm-leg{display:flex;align-items:center;gap:6px}
.hm-swatch{width:12px;height:12px;border-radius:3px;display:inline-block;flex-shrink:0;background:var(--hm-empty)}
.hm-summary{margin:0 0 13px;font-size:13.5px;color:var(--ink-soft)}
.hm-summary b{color:var(--ink);font-weight:700}

/* 한 달치 달력 한 판 */
.hm-body{display:flex;gap:26px;align-items:flex-start;flex-wrap:wrap}
.hm-cal{width:min(300px,100%)}
.hm-side{flex:1;min-width:230px}
.hm-dow-row{display:grid;grid-template-columns:repeat(7,1fr);gap:5px;margin-bottom:6px}
.hm-dow-row span{text-align:center;font-size:10.5px;font-weight:700;color:var(--ink-faint)}
.hm-dow-row .is-sun{color:var(--overdue)}
.hm-dow-row .is-sat{color:var(--accent)}
.hm-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:5px}
/* 정사각형으로 두면 한 달 6줄이 세로로 너무 길어진다. 살짝 납작하게 */
.hm-cell{
  height:28px;border-radius:7px;background:var(--hm-empty);
  padding:3px 0 0 5px;font-family:var(--mono);font-size:10.5px;font-weight:700;
  color:var(--ink-faint);line-height:1;
}
.hm-cell.is-blank{background:transparent}
.hm-cell.is-future{background:transparent;box-shadow:inset 0 0 0 1px var(--line)}
.hm-cell.is-dark{color:#fff}
.hm-cell.is-today{outline:2px solid var(--ink);outline-offset:1px}

/* 한쪽만 있는 날 */
.hm-cell[data-s="1"][data-r="0"],.hm-swatch[data-s="1"][data-r="0"]{background:var(--hm-g1)}
.hm-cell[data-s="2"][data-r="0"],.hm-swatch[data-s="2"][data-r="0"]{background:var(--hm-g2)}
.hm-cell[data-s="0"][data-r="1"],.hm-swatch[data-s="0"][data-r="1"]{background:var(--hm-b1)}
.hm-cell[data-s="0"][data-r="2"],.hm-swatch[data-s="0"][data-r="2"]{background:var(--hm-b2)}
/* 새 문제 + 복습이 겹친 날은 반반 */
.hm-cell[data-s="1"][data-r="1"],.hm-swatch[data-s="1"][data-r="1"]{background:linear-gradient(135deg,var(--hm-g1) 0 50%,var(--hm-b1) 50% 100%)}
.hm-cell[data-s="1"][data-r="2"]{background:linear-gradient(135deg,var(--hm-g1) 0 50%,var(--hm-b2) 50% 100%)}
.hm-cell[data-s="2"][data-r="1"]{background:linear-gradient(135deg,var(--hm-g2) 0 50%,var(--hm-b1) 50% 100%)}
.hm-cell[data-s="2"][data-r="2"]{background:linear-gradient(135deg,var(--hm-g2) 0 50%,var(--hm-b2) 50% 100%)}

/* ---------- 일정표 (주간 달력 + TODO) ---------- */
.sched-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:16px 0 14px}
.sched-head .eyebrow{color:var(--ink-faint)}
.sched-title{margin:0;font-size:22px;letter-spacing:-.4px;font-weight:700}
.sched-nav{display:flex;gap:6px}

.week-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));grid-auto-rows:320px;gap:10px;align-items:stretch}
.day-cell{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-soft);padding:11px 10px 9px;min-width:0;min-height:0;height:100%;
  display:flex;flex-direction:column;gap:7px;overflow:hidden;
  transition:border-color .16s ease,box-shadow .16s ease,transform .16s ease;
}
.day-cell:hover{border-color:var(--line-strong);box-shadow:0 8px 24px rgba(15,23,42,.07)}
.day-cell.is-today{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-soft),0 8px 24px rgba(37,99,235,.08)}
.day-cell.is-selected{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 18%,transparent),0 10px 26px rgba(37,99,235,.12);transform:translateY(-2px)}
.day-cell.is-past{background:var(--surface-2)}
.day-head{display:flex;align-items:center;justify-content:space-between;gap:6px;min-height:24px}
.day-date{display:flex;align-items:baseline;gap:5px;min-width:0}
.day-dow{font-size:11.5px;font-weight:700;color:var(--ink-faint)}
.day-cell.is-sun .day-dow{color:var(--overdue)}
.day-cell.is-sat .day-dow{color:var(--accent)}
.day-num{font-family:var(--mono);font-size:15px;font-weight:700;letter-spacing:-.3px}
.day-cell.is-today .day-num{color:var(--accent)}
.today-badge{padding:2px 5px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-size:9px;font-weight:800;white-space:nowrap}
.day-count{flex-shrink:0;font-size:10px;font-weight:750;color:var(--ink-faint);white-space:nowrap}
.day-count.is-complete{color:var(--solved)}
.day-progress{height:3px;border-radius:999px;background:var(--line);overflow:hidden}
.day-progress i{display:block;height:100%;border-radius:inherit;background:var(--solved);transition:width .2s ease}
.day-progress.is-empty{background:transparent;border-top:1px solid var(--line);height:1px;border-radius:0}

.day-todos{display:flex;flex-direction:column;gap:5px;flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;padding:1px 2px 2px 0;scrollbar-width:thin;scrollbar-color:var(--line-strong) transparent}
.day-todos::-webkit-scrollbar{width:4px}
.day-todos::-webkit-scrollbar-thumb{background:var(--line-strong);border-radius:999px}
.todo{
  display:flex;align-items:center;gap:6px;width:100%;min-width:0;min-height:32px;text-align:left;
  border:1px solid var(--line);background:var(--surface-2);border-radius:8px;
  padding:6px 7px;font-family:inherit;font-size:12px;line-height:1.35;color:var(--ink);
  cursor:pointer;position:relative;transition:background .14s ease,border-color .14s ease,transform .14s ease;
}
.todo:hover{transform:translateY(-1px)}
.todo[draggable="true"]{cursor:grab}
.todo.is-dragging{opacity:.42;transform:scale(.98)}
.day-cell.is-todo-drop{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft);background:var(--accent-soft)}
.todo-color-blue{--todo-accent:#3b82f6;background:#eff6ff;border-color:#bfdbfe}
.todo-color-yellow{--todo-accent:#d69e00;background:#fff9d9;border-color:#f5d96b}
.todo-color-purple{--todo-accent:#8b5cf6;background:#f5f0ff;border-color:#d8c7ff}
.todo-color-blue:hover{background:#dbeafe;border-color:#93c5fd}
.todo-color-yellow:hover{background:#fff3b0;border-color:#e9c94c}
.todo-color-purple:hover{background:#ede4ff;border-color:#c4afff}
.todo:not(.is-done) .tick{border-color:var(--todo-accent)}
.todo .tick{
  flex-shrink:0;width:14px;height:14px;border-radius:4px;
  border:1.5px solid var(--line-strong);background:var(--surface);
  font-size:9px;line-height:11px;text-align:center;color:transparent;font-weight:900;
}
.todo.is-done{color:var(--ink-faint);background:var(--solved-soft);border-color:transparent}
.todo.is-done .tick{background:var(--solved);border-color:var(--solved);color:#fff}
.todo.is-done .todo-text{text-decoration:line-through}
.todo.is-locked{cursor:not-allowed}
.todo.is-locked-overdue{color:var(--overdue);background:var(--overdue-soft);border-color:var(--overdue)}
.todo.is-locked-overdue:hover{color:var(--overdue);background:var(--overdue-soft);border-color:var(--overdue)}
.todo.is-locked-overdue .tick{color:#fff;background:var(--overdue);border-color:var(--overdue)}
.todo-text{min-width:0;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.todo-lock{flex-shrink:0;font-size:10px;font-weight:800;color:var(--overdue);padding:1px 2px}
.todo.is-done .todo-lock{color:var(--ink-faint)}
.todo-color-dot{
  position:absolute;right:24px;top:50%;width:12px;height:12px;transform:translateY(-50%);
  border:2px solid var(--surface);border-radius:50%;opacity:0;
  background:var(--todo-accent);box-shadow:0 0 0 1px var(--todo-accent);cursor:pointer;padding:0;
}
.todo-color-dot:hover{transform:translateY(-50%) scale(1.12)}
.todo-del{
  position:absolute;right:5px;top:50%;transform:translateY(-50%);
  border:0;background:transparent;color:var(--ink-faint);
  font-size:13px;line-height:1;padding:2px 3px;cursor:pointer;border-radius:4px;opacity:0;
}
.todo:hover .todo-del,.todo:hover .todo-color-dot,.todo:focus-within .todo-del,.todo:focus-within .todo-color-dot{opacity:1}
.todo-del:hover{color:var(--overdue);background:var(--overdue-soft)}
/* 터치 기기엔 hover가 없다 — 삭제 버튼을 항상 보여준다 */
@media (hover:none){ .todo{padding-right:42px}.todo-del,.todo-color-dot{opacity:1} }
@media (hover:none){ .folder-actions{opacity:1} }
.day-empty{margin:auto 0;font-size:11.5px;color:var(--ink-faint);padding:6px 2px;text-align:center}
.todo-closed{margin:0;padding:5px 2px;font-size:10.5px;font-weight:700;color:var(--ink-faint);text-align:center}

.todo-add-row{display:grid;grid-template-columns:minmax(0,1fr) auto 27px;gap:4px}
.todo-add input{
  width:100%;min-width:0;border:1px dashed var(--line-strong);border-radius:8px;
  padding:7px 8px;font-size:12.5px;font-family:inherit;background:transparent;color:var(--ink);
}
.todo-color-select{
  width:53px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink-soft);
  font-family:inherit;font-size:10.5px;padding:0 3px;cursor:pointer;
}
.todo-add-btn{
  border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--accent);
  font-size:15px;font-weight:800;cursor:pointer;padding:0;
}
.todo-add-btn:hover{border-color:var(--accent);background:var(--accent-soft)}
.todo-add input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent);border-style:solid;background:var(--surface)}
.todo-add input::placeholder{color:var(--ink-faint)}

/* 선택한 날짜의 긴 Todo를 잘리지 않게 읽는 상세 영역 */
.schedule-detail{
  width:min(920px,100%);min-height:280px;margin:26px auto 8px;padding:24px 26px;
  background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-soft);
  scroll-margin-top:90px;
}
.schedule-detail-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:18px;padding-bottom:16px;border-bottom:1px solid var(--line)}
.schedule-detail-head .eyebrow{margin:0 0 4px;color:var(--ink-faint)}
.schedule-detail-head h2{margin:0;font-size:23px;letter-spacing:-.4px}
.schedule-detail-summary{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end;color:var(--ink-soft);font-size:12px}
.schedule-detail-summary span{padding:6px 9px;border:1px solid var(--line);border-radius:999px;background:var(--surface-2);white-space:nowrap}
.schedule-detail-summary b{color:var(--ink);font-family:var(--mono)}
.schedule-detail-list{display:flex;flex-direction:column;gap:10px}
.schedule-detail .todo-detail{
  min-height:58px;align-items:flex-start;padding:13px 62px 13px 14px;border-radius:12px;
  font-size:15px;line-height:1.55;cursor:pointer;
}
.schedule-detail .todo-detail .tick{width:18px;height:18px;margin-top:2px;font-size:11px;line-height:15px}
.schedule-detail .todo-detail .todo-text{overflow:visible;text-overflow:clip;white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word}
.schedule-detail .todo-detail .todo-lock{margin-top:1px;font-size:11px}
.schedule-detail .todo-detail .todo-color-dot{right:35px;width:14px;height:14px;opacity:1}
.schedule-detail .todo-detail .todo-del{right:10px;opacity:1;font-size:16px}
.schedule-detail-empty{min-height:130px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;color:var(--ink-faint);text-align:center}
.schedule-detail-empty b{color:var(--ink-soft);font-size:15px}
.schedule-detail-empty span{font-size:12px}
.schedule-detail-add{margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.schedule-detail-add .todo-add-row{grid-template-columns:minmax(0,1fr) 76px 42px;gap:8px}
.schedule-detail-add input{min-height:44px;padding:10px 12px;font-size:14px;background:var(--surface-2)}
.schedule-detail-add .todo-color-select{width:76px;font-size:12px;padding:0 8px}
.schedule-detail-add .todo-add-btn{font-size:18px}
.schedule-detail-closed{margin:18px 0 0;padding:12px;border-radius:10px;background:var(--surface-2);color:var(--ink-faint);font-size:12px;font-weight:700;text-align:center}

.default-todo-panel{margin:12px 0 16px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--surface);box-shadow:var(--shadow-soft)}
.default-todo-head{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:12px}
.default-todo-head div{display:flex;align-items:baseline;gap:9px;flex-wrap:wrap}
.default-todo-head b{font-size:14px}.default-todo-head span{font-size:11.5px;color:var(--ink-faint)}
.default-todo-list{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:12px}
.default-todo-template{display:inline-flex;align-items:center;gap:7px;max-width:100%;padding:7px 8px;border:1px solid var(--line);border-radius:9px;background:var(--surface-2);font-size:12px}
.default-todo-template i{width:9px;height:9px;border-radius:50%;background:var(--todo-accent);flex:none}
.default-todo-template span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.default-todo-template button{border:0;background:transparent;color:var(--ink-faint);cursor:pointer;padding:0 2px;font-size:14px}
.default-todo-template button:hover{color:var(--overdue)}
.default-todo-form{display:grid;grid-template-columns:minmax(0,1fr) 76px auto;gap:8px}
.default-todo-form input{min-width:0;border:1px solid var(--line-strong);border-radius:9px;padding:9px 10px;background:var(--surface);color:var(--ink);font-family:inherit}

/* ---------- sync ---------- */
.btn.sync{background:var(--ink);border-color:var(--ink)}
.btn.sync:hover{background:#000;border-color:#000}
.sync-status{
  align-self:center;font-size:12px;font-weight:600;color:var(--ink-faint);
  padding:4px 9px;border-radius:20px;background:var(--surface-2);border:1px solid var(--line);
  white-space:nowrap;max-width:180px;overflow:hidden;text-overflow:ellipsis;
}
.sync-status[data-kind="ok"]{color:var(--solved);background:var(--solved-soft);border-color:transparent}
.sync-status[data-kind="dirty"]{color:var(--due);background:var(--due-soft);border-color:transparent}
.sync-status[data-kind="err"]{color:var(--overdue);background:var(--overdue-soft);border-color:transparent}
.sync-status[data-kind="busy"]{color:var(--accent);background:var(--accent-soft);border-color:transparent}

/* ---------- dialog / toast ---------- */
.dlg{border:0;border-radius:16px;padding:0;box-shadow:0 20px 60px rgba(20,26,44,.3);max-width:520px;width:92vw}
.dlg::backdrop{background:rgba(22,26,38,.4)}
.dlg-inner{padding:22px;max-height:86vh;overflow:auto}
.dlg-inner h2{margin:0 0 16px;font-size:18px}
.dlg-note{font-size:12.5px;color:var(--ink-soft);margin:12px 0 0;line-height:1.6}
.dlg-note code{font-family:var(--mono);font-size:.9em;background:var(--surface-2);border:1px solid var(--line);padding:1px 5px;border-radius:5px}
.dlg-sec{
  font-size:12px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;color:var(--ink-faint);
  margin:22px 0 0;padding-top:16px;border-top:1px solid var(--line);
}
.dlg-inner .dlg-sec:first-of-type{margin-top:0;padding-top:0;border-top:0}
.dlg-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.dlg-grid .field.wide{grid-column:span 2}
.dlg-testrow{display:flex;align-items:center;gap:10px;margin-top:12px;flex-wrap:wrap}
.test-result{font-size:12.5px;font-weight:600;color:var(--ink-soft);flex:1;min-width:0}
.test-result[data-kind="ok"]{color:var(--solved)}
.test-result[data-kind="err"]{color:var(--overdue)}
#s-centralEmailState:not(:empty){
  display:inline-flex;
  align-items:center;
  flex:0 1 auto;
  padding:6px 10px;
  border:1px solid transparent;
  border-radius:999px;
  font-weight:800;
  line-height:1.2;
}
#s-centralEmailState[data-kind="ok"]{
  color:#067647;
  background:#ecfdf3;
  border-color:#abefc6;
}
#s-centralEmailState[data-kind="pending"]{
  color:#9a6700;
  background:#fff8db;
  border-color:#f2d675;
}

/* ---------- 사용량 ---------- */
.usage-out{display:flex;flex-direction:column;gap:10px;margin-top:12px}
.usage-out:empty{margin-top:0}
.usage-row{
  background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:10px 12px;
}
.usage-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.usage-label{font-size:12.5px;font-weight:600;color:var(--ink-soft)}
.usage-value{font-size:13.5px;font-weight:700;color:var(--ink);white-space:nowrap}
.usage-bar{height:5px;border-radius:99px;background:var(--line);overflow:hidden;margin-top:8px}
.usage-bar > i{display:block;height:100%;border-radius:99px;background:var(--accent)}
.usage-note{margin:6px 0 0;font-size:11.5px;color:var(--ink-faint);line-height:1.5}
.usage-link{
  display:inline-block;margin-top:8px;font-size:12px;font-weight:700;
  color:var(--accent);text-decoration:none;
}
.usage-link:hover{text-decoration:underline}
.usage-row[data-kind="warn"] .usage-value{color:var(--overdue)}
.usage-row[data-kind="warn"] .usage-bar > i{background:var(--overdue)}
.usage-row[data-kind="err"] .usage-value{color:var(--overdue)}
.usage-row[data-kind="muted"]{opacity:.72}
.usage-row[data-kind="muted"] .usage-value{color:var(--ink-faint);font-weight:600}

/* ---------- team leaderboard ---------- */
.team-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin:28px 0 18px}
.team-head h1{margin:0;font-size:30px;letter-spacing:-.6px}
.team-head .eyebrow{color:var(--ink-faint)}
.team-date{margin:5px 0 0;color:var(--ink-faint);font-size:12px}
.team-head-actions{display:flex;align-items:center;gap:8px}
.team-login{padding:24px}
.team-login h2{margin:0 0 7px;font-size:19px}
.team-login p{margin:0;color:var(--ink-soft);font-size:13px}
.team-join-row{display:flex;gap:8px;margin-top:16px}
.team-join-row input{flex:1;min-width:0;border:1px solid var(--line-strong);border-radius:10px;padding:10px 12px;font:inherit}
.team-me{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:10px;margin-bottom:16px}
.team-me>div{display:flex;flex-direction:column;gap:4px;background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:14px 16px;box-shadow:var(--shadow-soft)}
.team-me span{font-size:11px;color:var(--ink-faint);font-weight:700;text-transform:uppercase;letter-spacing:.3px}
.team-me b{font-size:15px;overflow-wrap:anywhere}
.team-leader-panel{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 16px;padding:13px 15px;background:var(--accent-soft);border:1px solid #d8d5ff;border-radius:13px}
.team-leader-panel>div:first-child{display:flex;flex-direction:column;gap:2px}
.team-leader-panel span{font-size:11.5px;color:var(--ink-soft)}
.team-leader-actions{display:flex;gap:8px;min-width:min(100%,430px)}
.team-leader-actions input{flex:1;min-width:0;border:1px solid var(--line-strong);border-radius:9px;padding:7px 10px;background:var(--surface);font-family:var(--mono);font-size:12px}
.team-rank-panel{background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-soft)}
.team-rules{display:flex;gap:8px;flex-wrap:wrap;padding:13px 16px;border-bottom:1px solid var(--line);background:var(--surface-2)}
.team-rules span{padding:5px 9px;border-radius:999px;background:var(--surface);border:1px solid var(--line);font-size:11.5px;color:var(--ink-soft)}
.team-rules b{color:var(--accent)}
.team-share-note{margin:0;padding:10px 16px;border-bottom:1px solid var(--line);font-size:12px;color:var(--ink-soft);background:var(--surface)}
.team-table-wrap{overflow-x:auto}
.team-table{width:100%;border-collapse:collapse;min-width:680px}
.team-table th,.team-table td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left}
.team-table th{font-size:11px;color:var(--ink-faint);text-transform:uppercase;letter-spacing:.4px;background:var(--surface-2)}
.team-table tbody tr:last-child td{border-bottom:0}
.team-table tbody tr[data-member-login]{cursor:pointer;transition:background .14s ease,box-shadow .14s ease}
.team-table tbody tr[data-member-login]:hover{background:var(--surface-2)}
.team-table tbody tr[data-member-login]:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.team-table tbody tr.is-selected{background:var(--accent-soft);box-shadow:inset 4px 0 var(--accent)}
.team-table tbody tr.is-first{
  background:#ffe7a3;
  box-shadow:inset 4px 0 #d39b00;
}
.team-table tbody tr.is-first .team-rank{color:#966900;text-shadow:0 1px #fff7cf}
.team-table tbody tr.is-first .team-person b,.team-table tbody tr.is-first .team-score{color:#684800}
.team-table tbody tr.is-second{
  background:#e3e7ed;
  box-shadow:inset 4px 0 #8b95a5;
}
.team-table tbody tr.is-second .team-rank{color:#667080;text-shadow:0 1px #fff}
.team-table tbody tr.is-second .team-person b,.team-table tbody tr.is-second .team-score{color:#414956}
.team-table tbody tr.is-third{
  background:#edc5a7;
  box-shadow:inset 4px 0 #b66b38;
}
.team-table tbody tr.is-third .team-rank{color:#92502c;text-shadow:0 1px #fff4eb}
.team-table tbody tr.is-third .team-person b,.team-table tbody tr.is-third .team-score{color:#6f3f27}
.team-table tbody tr.is-first:hover,.team-table tbody tr.is-first.is-selected{background:#ffe7a3;box-shadow:inset 4px 0 #d39b00}
.team-table tbody tr.is-second:hover,.team-table tbody tr.is-second.is-selected{background:#e3e7ed;box-shadow:inset 4px 0 #8b95a5}
.team-table tbody tr.is-third:hover,.team-table tbody tr.is-third.is-selected{background:#edc5a7;box-shadow:inset 4px 0 #b66b38}
.team-rank{font-family:var(--mono);font-size:16px;font-weight:800;color:var(--accent);width:68px}
.team-person{display:flex;align-items:center;gap:10px}
.team-person img{border-radius:50%;background:var(--surface-2)}
.team-person span{display:flex;flex-direction:column;line-height:1.25}
.team-person small{color:var(--ink-faint);font-size:11px}
.team-score{font-family:var(--mono);font-weight:800}
.team-streak,.team-today{font-size:12.5px;color:var(--ink-soft)}
.team-member-problems{border-top:1px solid var(--line);padding:18px 20px 20px;background:var(--surface-2)}
.team-member-problems-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:12px}
.team-member-problems-head h2{margin:0;font-size:18px;letter-spacing:-.25px}
.team-member-problems-head p{margin:4px 0 0;font-size:11.5px;color:var(--ink-faint)}
.team-problem-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.team-problem-list li{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:11px 13px;border:1px solid var(--line);border-radius:11px;background:var(--surface)}
.team-problem-main{display:flex;align-items:center;gap:10px;min-width:0}
.team-problem-name{font-size:13.5px;font-weight:700;overflow-wrap:anywhere}
.team-problem-main a{font-size:11.5px;white-space:nowrap;color:var(--accent);font-weight:700}
.team-problem-main a.team-solution-link{color:#087a55}
.team-problem-meta{display:flex;align-items:center;justify-content:flex-end;gap:7px;flex-wrap:wrap;color:var(--ink-faint);font-size:11px}
.team-problem-meta span{padding:3px 7px;border-radius:999px;background:var(--surface-2);border:1px solid var(--line)}
.team-problem-meta span[data-status="solved"]{color:#087a55;background:#e7f8f0;border-color:#b9e7d2}
.team-problem-meta span[data-status="review"]{color:#a56b00;background:#fff6d8;border-color:#edd68c}
.team-problem-list .team-problems-empty{justify-content:center;color:var(--ink-faint);font-size:12.5px;padding:22px}

.toast{
  position:fixed;left:50%;bottom:26px;transform:translateX(-50%);
  background:var(--ink);color:#fff;padding:11px 18px;border-radius:11px;
  font-size:14px;font-weight:600;box-shadow:0 10px 30px rgba(0,0,0,.25);z-index:60;
}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .week-grid{grid-template-columns:repeat(4,minmax(0,1fr));grid-auto-rows:300px}
}
@media (max-width:1270px) and (min-width:821px){
  .concepts-layout{grid-template-columns:270px minmax(0,1fr)}
  .concept-ai{grid-column:2;position:static;height:560px}
}
@media (max-width:820px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .field.wide{grid-column:span 2}
  /* 좁은 화면에선 높이를 고정하지 않고 아래로 흐르게 둔다 */
  .concepts-layout{grid-template-columns:minmax(0,1fr)}
  .concept-side{position:static;max-height:none}
  .concept-list{overflow:visible}
  .concept-main{min-height:0}
  .concept-empty{height:320px}
  .concept-editor{height:auto}
  .concept-ai{position:static;height:560px}
  .editor-split{grid-template-columns:1fr;flex:none}
  .c-body{min-height:300px;height:auto}
  .c-preview{min-height:240px;height:auto}
  .week-grid{grid-template-columns:repeat(2,minmax(0,1fr));grid-auto-rows:minmax(220px,auto)}
  .team-problem-list li{align-items:flex-start;flex-direction:column;gap:7px}
  .team-problem-meta{justify-content:flex-start}
  .day-cell{min-height:220px;height:auto}
  .schedule-detail{width:100%;min-height:240px;margin-top:18px;padding:20px}
}
@media (max-width:620px){
  .app{padding:0 13px 60px}
  .topbar{flex-wrap:wrap;gap:10px}
  .topbar-actions{width:100%;margin-left:0;flex-wrap:wrap}
  .dlg-grid{grid-template-columns:1fr}
  .dlg-grid .field.wide{grid-column:span 1}
  .tabs{margin-left:0}
  .prob{grid-template-columns:1fr}
  .prob-right{align-items:flex-start}
  .grid{grid-template-columns:1fr}
  .field.wide{grid-column:span 1}
  #reviewTitle{font-size:22px}
  .week-grid{grid-template-columns:1fr;grid-auto-rows:auto}
  .day-cell{min-height:180px;height:auto}
  .day-todos{overflow:visible}
  .schedule-detail{padding:17px 14px;border-radius:14px}
  .schedule-detail-head{align-items:flex-start;flex-direction:column}
  .schedule-detail-summary{justify-content:flex-start}
  .schedule-detail .todo-detail{padding:12px 58px 12px 12px;font-size:14px}
  .schedule-detail-add .todo-add-row{grid-template-columns:minmax(0,1fr) 65px 38px}
  .schedule-detail-add .todo-color-select{width:65px}
  .hm-legend{gap:8px;font-size:11px}
  .heatmap-panel{padding:14px 14px 12px}
  .quick-site-form{grid-template-columns:1fr 1fr}
  .quick-site-form input{grid-column:span 2}
  .team-head{align-items:flex-start;flex-direction:column}
  .team-me{grid-template-columns:1fr 1fr}
  .team-join-row{flex-direction:column}
  .team-leader-panel{align-items:stretch;flex-direction:column}
  .team-leader-actions{min-width:0;flex-direction:column}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}