/* ============================================================
   LMS · 전용 스타일
   ============================================================ */

.head-panel{padding:20px 24px}
.head-row{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.head-hint{margin-top:10px;font-size:12px}

.picker-group{display:flex;align-items:center;gap:8px}
.picker-group label{font-size:12px;color:var(--muted,#8a94ad);font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.picker-group select{
  padding:8px 12px;border-radius:8px;
  background:var(--paper-2);border:1px solid var(--line);
  color:var(--text,#e8ecf6);font-family:inherit;font-size:13px;
  min-width:160px;
}
.picker-group select:focus{outline:none;border-color:#6c8cff}
.picker-group select:disabled{opacity:.5;cursor:not-allowed}
.btn-sm{padding:6px 12px;font-size:12px}
.head-stats{
  margin-left:auto;display:flex;gap:12px;flex-wrap:wrap;
  font-size:12px;color:var(--muted,#8a94ad);
}
.head-stats .stat-pill{
  padding:6px 12px;border-radius:999px;
  background:rgba(108,140,255,.08);border:1px solid rgba(108,140,255,.2);
  color:#a8bdff;font-weight:600;
}

/* ---------- 학생 그리드 ---------- */
.student-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:10px;margin-top:12px;
}
.student-card{
  display:flex;flex-direction:column;gap:8px;
  padding:14px 18px;border-radius:12px;
  background:var(--paper-2);
  border:1px solid var(--line);
  transition:.15s;
}
.student-card:hover{background:var(--paper-2);border-color:rgba(108,140,255,.3)}
.student-head{display:flex;justify-content:space-between;align-items:center;gap:8px}
.student-name{font-size:15px;font-weight:700;color:var(--ink);display:flex;align-items:center;gap:6px}
.student-name .num{
  display:inline-grid;place-items:center;
  width:22px;height:22px;border-radius:6px;
  background:var(--line);
  color:var(--muted,#8a94ad);
  font-size:11px;font-weight:700;
}
.student-actions{display:flex;gap:4px}
.student-actions button{
  padding:4px 8px;border-radius:6px;border:1px solid var(--line);
  background:transparent;color:var(--muted,#8a94ad);
  font-size:11px;cursor:pointer;transition:.15s;
}
.student-actions button:hover{background:var(--paper-2);color:var(--ink)}
.student-actions .danger:hover{background:rgba(255,84,102,.15);color:#ff9aaa;border-color:rgba(255,84,102,.3)}

/* 진도 상태 토글 */
.progress-row{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:8px 0;border-top:1px solid var(--line);
}
.progress-label{font-size:11px;color:var(--muted,#8a94ad);font-weight:600}
.status-toggle{display:flex;gap:4px}
.status-btn{
  padding:4px 8px;border-radius:6px;border:1px solid var(--line);
  background:transparent;color:var(--muted,#8a94ad);
  font-size:14px;line-height:1;cursor:pointer;transition:.15s;min-width:30px;
}
.status-btn:hover{background:var(--paper-2)}
.status-btn.active.s-not{background:var(--paper-2);color:#b0b8c8;border-color:#666}
.status-btn.active.s-prog{background:rgba(108,140,255,.2);color:#a8bdff;border-color:#6c8cff}
.status-btn.active.s-done{background:rgba(90,220,140,.2);color:#8ae0a6;border-color:#5adc8c}

/* 점수 입력 */
.score-row{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
}
.score-input{
  display:flex;align-items:center;gap:4px;
}
.score-input input{
  width:60px;padding:4px 8px;border-radius:6px;
  background:var(--paper-2);border:1px solid var(--line);
  color:var(--text,#e8ecf6);font-family:'Space Grotesk',sans-serif;
  font-size:14px;font-weight:700;text-align:center;
}
.score-input input:focus{outline:none;border-color:#6c8cff}
.score-input .max{font-size:11px;color:var(--muted,#8a94ad)}

.empty-msg{
  text-align:center;padding:40px 20px;
  color:var(--muted,#8a94ad);font-size:13px;
}

/* ---------- 통계 ---------- */
.stats-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:12px;margin-top:10px;
}
.stat-card{
  padding:16px 18px;border-radius:10px;
  background:var(--paper-2);
  border:1px solid var(--line);
}
.stat-card .stat-label{font-size:11px;color:var(--muted,#8a94ad);text-transform:uppercase;letter-spacing:.05em;font-weight:700;margin-bottom:6px}
.stat-card .stat-value{font-family:'Space Grotesk',sans-serif;font-size:28px;font-weight:700;color:var(--ink);line-height:1}
.stat-card .stat-sub{font-size:11px;color:var(--muted,#8a94ad);margin-top:4px}

.progress-bar{
  width:100%;height:6px;background:var(--paper-2);
  border-radius:3px;overflow:hidden;margin-top:8px;
}
.progress-bar > div{
  height:100%;background:linear-gradient(90deg,#6c8cff,#a178ff);
  border-radius:3px;transition:width .5s;
}

.histogram{
  display:flex;align-items:flex-end;gap:4px;height:60px;margin-top:8px;
}
.histo-bar{
  flex:1;background:linear-gradient(180deg,#a178ff,#6c8cff);
  border-radius:4px 4px 0 0;min-width:6px;
  position:relative;
}
.histo-bar:hover{filter:brightness(1.2)}
.histo-bar .histo-label{
  position:absolute;bottom:-16px;left:50%;transform:translateX(-50%);
  font-size:9px;color:var(--muted,#8a94ad);white-space:nowrap;
}

/* ---------- 모달 ---------- */
.modal{
  position:fixed;inset:0;
  background:rgba(10,12,20,.7);backdrop-filter:blur(8px);
  z-index:9999;display:grid;place-items:center;padding:20px;
}
.modal.hidden{display:none}
.modal-card{
  position:relative;
  width:min(440px,100%);max-height:90vh;overflow:auto;
  background:#161a26;
  border:1px solid var(--line);border-radius:16px;
  padding:24px 28px;
  box-shadow:0 24px 60px rgba(0,0,0,.4);
}
.modal-card h3{margin:0 0 12px;font-size:18px}
.modal-close{
  position:absolute;top:16px;right:20px;
  background:none;border:none;color:var(--muted,#8a94ad);
  font-size:24px;cursor:pointer;line-height:1;
}
.field{display:flex;flex-direction:column;gap:6px;margin-top:14px}
.field>span{font-size:12px;color:var(--muted,#8a94ad);font-weight:600}
.field input,.field select,.field textarea{
  padding:10px 12px;border-radius:8px;
  background:var(--paper-2);border:1px solid var(--line);
  color:var(--text,#e8ecf6);font-family:inherit;font-size:14px;
  box-sizing:border-box;
}
.field input:focus,.field textarea:focus{outline:none;border-color:#6c8cff}
.field textarea{resize:vertical;min-height:80px}
.form-actions{display:flex;gap:10px;margin-top:18px}

/* 단원 정보 표시 */
.unit-info{
  margin-top:8px;padding:10px 14px;border-radius:8px;
  background:rgba(108,140,255,.06);
  border:1px solid rgba(108,140,255,.15);
  font-size:12px;color:#a8bdff;line-height:1.6;
}
.unit-info b{color:var(--ink)}

/* 모바일 */
@media (max-width:600px){
  .head-row{flex-direction:column;align-items:stretch}
  .picker-group{width:100%;flex-wrap:wrap}
  .picker-group select{flex:1;min-width:0}
  .head-stats{margin-left:0}
  .student-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
/* 아주 좁은 화면(휴대폰): 통계 카드 2열이 넘쳐서 1열로 */
@media (max-width:400px){
  .stats-grid{grid-template-columns:1fr}
  .stat-card .stat-value{font-size:24px;word-break:break-word}
}