/* =========================================================
   교사용 대시보드 — Figma 풍
   도트 그리드 · 어두운 툴바 · 파란 액센트 · 1px 테두리
   ========================================================= */

[hidden] { display: none !important; }

:root {
  --bg:       #f5f5f5;
  --dot:      #e0e0e0;
  --panel:    #ffffff;
  --line:     #e5e5e5;
  --line2:    #d4d4d4;
  --ink:      #1a1a1a;
  --ink2:     #545454;
  --ink3:     #8a8a8a;
  --toolbar:  #2c2c2c;
  --toolbar2: #383838;
  --blue:     #0d99ff;
  --blue-bg:  #e5f4ff;
  --green:    #14ae5c;
  --amber:    #ffb300;
  --orange:   #ff8a34;
  --red:      #f24822;
  --radius:   6px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  background-image: radial-gradient(var(--dot) 1px, transparent 1px);
  background-size: 16px 16px;
  color: var(--ink);
  font-family: "Inter", "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif;
  font-size: 13px; line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.tnum { font-variant-numeric: tabular-nums; }

/* ── 툴바 ────────────────────────────────────────────── */
.toolbar {
  position: sticky; top: 0; z-index: 30;
  background: var(--toolbar); color: #fff;
  display: flex; align-items: center; gap: 8px;
  padding: 0 12px; height: 46px;
  border-bottom: 1px solid #000;
}
.tb-logo { width: 22px; height: 22px; border-radius: 4px; background: var(--blue); display: grid; place-items: center; font-size: 12px; }
.tb-title { font-weight: 600; font-size: 13px; letter-spacing: -.1px; }
.tb-sub { color: #9a9a9a; font-size: 12px; }
.tb-sp { flex: 1 1 auto; }

.seg { display: flex; background: var(--toolbar2); border-radius: var(--radius); padding: 2px; }
.seg button {
  border: 0; background: transparent; color: #b5b5b5;
  font-family: inherit; font-size: 12px; font-weight: 500;
  padding: 5px 13px; border-radius: 4px; cursor: pointer;
}
.seg button[aria-selected="true"] { background: var(--blue); color: #fff; }

.tbtn {
  border: 1px solid #4a4a4a; background: var(--toolbar2); color: #e8e8e8;
  font-family: inherit; font-size: 12px; font-weight: 500;
  padding: 6px 11px; border-radius: var(--radius); cursor: pointer;
}
.tbtn:hover { background: #454545; }
.tbtn.accent { background: var(--blue); border-color: var(--blue); color: #fff; }
.tbtn.accent:hover { background: #0b86e0; }

/* ── 레이아웃 ────────────────────────────────────────── */
.page { max-width: 1240px; margin: 0 auto; padding: 18px 16px 60px; }

.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); margin-bottom: 14px;
}
.panel > header {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 11px 14px; border-bottom: 1px solid var(--line);
}
.panel > header h2 { margin: 0; font-size: 13px; font-weight: 600; letter-spacing: -.1px; }
.panel > header .hint { color: var(--ink3); font-size: 12px; }
.panel .body { padding: 14px; }

/* ── 로그인 ──────────────────────────────────────────── */
.login { max-width: 360px; margin: 70px auto; }
.login .body { padding: 22px; }
.login h1 { font-size: 16px; margin: 0 0 4px; font-weight: 600; }
.login p { color: var(--ink3); margin: 0 0 18px; font-size: 12px; }
.f { margin-bottom: 12px; }
.f label { display: block; font-size: 12px; font-weight: 500; color: var(--ink2); margin-bottom: 5px; }
input[type="password"], input[type="text"], select {
  width: 100%; padding: 8px 10px;
  border: 1px solid var(--line2); border-radius: var(--radius);
  background: #fff; color: var(--ink);
  font-family: inherit; font-size: 13px;
}
input:focus, select:focus { outline: 2px solid var(--blue); outline-offset: -1px; border-color: var(--blue); }
.bbtn {
  width: 100%; padding: 9px; border: 0; border-radius: var(--radius);
  background: var(--blue); color: #fff; font-family: inherit;
  font-size: 13px; font-weight: 600; cursor: pointer;
}
.bbtn:hover { background: #0b86e0; }
.msg { border-radius: var(--radius); padding: 8px 10px; font-size: 12px; margin-bottom: 12px; }
.msg.bad  { background: #fff0ed; color: #b3200a; border: 1px solid #ffd2c9; }
.msg.info { background: var(--blue-bg); color: #05548f; border: 1px solid #b8e2ff; }

/* ── 통계 타일 ───────────────────────────────────────── */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(132px, 1fr)); gap: 10px; margin-bottom: 14px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 11px 13px; }
.stat .k { font-size: 11px; color: var(--ink3); font-weight: 500; text-transform: uppercase; letter-spacing: .4px; }
.stat .v { font-size: 25px; font-weight: 600; letter-spacing: -.7px; margin-top: 2px; }
.stat .u { font-size: 12px; color: var(--ink3); font-weight: 500; margin-left: 2px; }

/* ── 반별 현황 격자 ──────────────────────────────────── */
.grid-legend { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; font-size: 12px; color: var(--ink2); }
.lg { display: inline-flex; align-items: center; gap: 5px; }
.sw { width: 12px; height: 12px; border-radius: 3px; border: 1px solid rgba(0,0,0,.12); }

.crow { display: grid; grid-template-columns: 46px 1fr; gap: 10px; align-items: start; margin-bottom: 9px; }
.cname { font-size: 12px; font-weight: 600; color: var(--ink2); padding-top: 5px; }
.cells { display: grid; grid-template-columns: repeat(29, minmax(0, 1fr)); gap: 3px; }
.cell {
  aspect-ratio: 1 / 1; border-radius: 3px; border: 1px solid var(--line);
  background: #fafafa; display: grid; place-items: center;
  font-size: 9px; color: #b0b0b0; cursor: default;
  font-variant-numeric: tabular-nums;
}
.cell.has { color: #fff; font-weight: 600; border-color: rgba(0,0,0,.1); cursor: pointer; }
.cell.s90 { background: var(--green); }
.cell.s80 { background: #4cc38a; }
.cell.s70 { background: var(--amber); }
.cell.s60 { background: var(--orange); }
.cell.s00 { background: var(--red); }

/* ── 표 ──────────────────────────────────────────────── */
.filters { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.filters select, .filters input { width: auto; min-width: 120px; }

.tablewrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
thead th {
  position: sticky; top: 46px; z-index: 10;
  background: #fafafa; border-bottom: 1px solid var(--line2);
  text-align: left; font-weight: 600; color: var(--ink2);
  padding: 8px 10px; white-space: nowrap; cursor: pointer; user-select: none;
}
thead th:hover { background: #f0f0f0; }
thead th .ar { color: var(--blue); font-size: 10px; }
tbody td { border-bottom: 1px solid var(--line); padding: 8px 10px; white-space: nowrap; }
tbody tr { cursor: pointer; }
tbody tr:hover { background: #fafcff; }
tbody tr.open { background: var(--blue-bg); }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.score { font-weight: 600; font-variant-numeric: tabular-nums; }
.dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 6px; vertical-align: 1px; }

.detail td { background: #fbfbfb; padding: 0; }
.dwrap { padding: 12px 14px; }
.dgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 6px; }
.ditem { display: flex; gap: 8px; align-items: baseline; border: 1px solid var(--line); border-radius: 4px; padding: 6px 9px; background: #fff; font-size: 12px; }
.ditem .qi { flex: 0 0 auto; font-weight: 600; color: var(--ink3); font-variant-numeric: tabular-nums; }
.ditem .qa { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; }
.ditem.ok  { border-left: 3px solid var(--green); }
.ditem.no  { border-left: 3px solid var(--red); }
.dmeta { color: var(--ink3); font-size: 12px; margin-bottom: 9px; }

.empty { text-align: center; color: var(--ink3); padding: 40px 14px; font-size: 13px; }

@media (max-width: 900px) {
  .cells { gap: 2px; }
  .cell { font-size: 0; }
  thead th { position: static; }
}
@media (max-width: 560px) {
  .toolbar { height: auto; padding: 8px 10px; flex-wrap: wrap; }
  .crow { grid-template-columns: 34px 1fr; }
}