/* =====================================================================
   YMS UI — Design System (modern minimal)
   관리자/학부모 공용. 기능 JS/ID는 건드리지 않고 표현만 담당.
   접두사 규칙: 레이아웃/컴포넌트는 y- 또는 app- 프리픽스 사용.
   ===================================================================== */

/* ---------- 1. Design Tokens ---------- */
:root {
  /* Brand */
  --y-primary:        #2563eb;
  --y-primary-hover:  #1d4ed8;
  --y-primary-active: #1e40af;
  --y-primary-soft:   #eef4ff;
  --y-primary-softer: #f6f9ff;
  --y-on-primary:     #ffffff;

  /* Semantic */
  --y-success: #16a34a;  --y-success-soft: #e8f6ee;
  --y-warning: #d97706;  --y-warning-soft: #fdf2e3;
  --y-danger:  #dc2626;  --y-danger-soft:  #fdecec;
  --y-info:    #0ea5e9;  --y-info-soft:    #e6f6fe;

  /* Surfaces & text */
  --y-bg:        #f5f6f8;
  --y-surface:   #ffffff;
  --y-surface-2: #f9fafb;
  --y-border:    #e6e8ec;
  --y-border-strong: #d3d7de;
  --y-text:      #111827;
  --y-heading:   #0f172a;
  --y-muted:     #6b7280;
  --y-faint:     #9ca3af;

  /* Radius */
  --y-r-sm: 8px;
  --y-r-md: 12px;
  --y-r-lg: 16px;
  --y-r-xl: 22px;
  --y-r-pill: 999px;

  /* Shadow */
  --y-shadow-xs: 0 1px 2px rgba(16,24,40,.05);
  --y-shadow-sm: 0 1px 3px rgba(16,24,40,.08), 0 1px 2px rgba(16,24,40,.04);
  --y-shadow-md: 0 6px 16px rgba(16,24,40,.08);
  --y-shadow-lg: 0 12px 32px rgba(16,24,40,.12);

  /* Layout */
  --y-sidebar-w: 264px;
  --y-topbar-h: 68px;

  /* Type */
  --y-font: "Pretendard", "Pretendard Variable", -apple-system, BlinkMacSystemFont,
            "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", Roboto, sans-serif;

  --y-t: .18s cubic-bezier(.4,0,.2,1);
}

/* ---------- 2. Base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--y-font);
  font-size: 14px;
  line-height: 1.6;                 /* 가독성 위해 행간 여유 */
  letter-spacing: -0.01em;          /* 한글/영문 자간 살짝 좁혀 정돈 */
  color: var(--y-text);
  background: var(--y-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1,h2,h3,h4,h5,h6 { color: var(--y-heading); margin: 0; font-weight: 700; letter-spacing: -.01em; }
a { color: var(--y-primary); text-decoration: none; }
a:hover { color: var(--y-primary-hover); }
img { max-width: 100%; }
:focus-visible { outline: 2px solid var(--y-primary); outline-offset: 2px; }
::selection { background: var(--y-primary-soft); }

/* scrollbar */
.y-scroll::-webkit-scrollbar, .app-sidebar::-webkit-scrollbar { width: 8px; height: 8px; }
.y-scroll::-webkit-scrollbar-thumb, .app-sidebar::-webkit-scrollbar-thumb { background: #d7dbe2; border-radius: 8px; }
.y-scroll::-webkit-scrollbar-track, .app-sidebar::-webkit-scrollbar-track { background: transparent; }

/* ---------- 3. App Shell ---------- */
.app-topbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--y-topbar-h); z-index: 40;
  display: flex; align-items: center; gap: 12px;
  padding: 0 18px;
  background: rgba(255,255,255,.86);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--y-border);
}
.app-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--y-heading); font-size: 16px; letter-spacing: -.02em; }
.app-brand .app-logo {
  width: 34px; height: 34px; border-radius: 10px; flex-shrink: 0;
  display: grid; place-items: center; color: #fff; font-weight: 800;
  background: linear-gradient(135deg, var(--y-primary), #4f7cf7);
  box-shadow: var(--y-shadow-sm);
}
.app-brand .app-logo-img { height: 52px; width: auto; display: block; flex-shrink: 0; }
.app-topbar-spacer { flex: 1; }

.app-iconbtn {
  width: 40px; height: 40px; border-radius: var(--y-r-sm); border: 1px solid transparent;
  background: transparent; color: var(--y-muted); cursor: pointer;
  display: grid; place-items: center; font-size: 20px; transition: var(--y-t);
}
.app-iconbtn:hover { background: var(--y-surface-2); color: var(--y-text); }

.app-hamburger { display: none; }

/* Sidebar */
.app-sidebar {
  position: fixed; top: var(--y-topbar-h); bottom: 0; left: 0; width: var(--y-sidebar-w); z-index: 35;
  background: var(--y-surface); border-right: 1px solid var(--y-border);
  overflow-y: auto; padding: 14px 12px 24px;
  transition: transform var(--y-t);
}
.app-backdrop {
  position: fixed; inset: 0; z-index: 34; background: rgba(15,23,42,.42);
  opacity: 0; visibility: hidden; transition: opacity var(--y-t);
}

/* Main */
.app-main {
  margin-left: var(--y-sidebar-w); padding-top: var(--y-topbar-h);
  min-height: 100vh;
}
.app-content { padding: 26px clamp(16px, 3vw, 34px) 60px; max-width: 1440px; }

/* ---------- 4. Sidebar nav ---------- */
.nav-cap { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  color: var(--y-faint); padding: 16px 12px 8px; }
.nav-item { margin: 2px 0; }
.nav-link {
  display: flex; align-items: center; gap: 11px; padding: 9px 12px; border-radius: 10px;
  color: #414b5a; font-weight: 500; font-size: 13.5px; cursor: pointer; transition: var(--y-t);
  position: relative;
}
.nav-link:hover { background: var(--y-surface-2); color: var(--y-heading); }
.nav-link .nav-ic { font-size: 20px; color: var(--y-faint); flex-shrink: 0; transition: var(--y-t); }
.nav-link.active { background: var(--y-primary-soft); color: var(--y-primary-active); font-weight: 600; }
.nav-link.active .nav-ic { color: var(--y-primary); }
.nav-link.active::before {
  content: ""; position: absolute; left: -12px; top: 8px; bottom: 8px; width: 3px;
  border-radius: 0 3px 3px 0; background: var(--y-primary);
}
.nav-group > .nav-link .nav-caret { margin-left: auto; font-size: 16px; color: var(--y-faint); transition: transform var(--y-t); }
.nav-group.open > .nav-link .nav-caret { transform: rotate(90deg); }
.nav-sub { list-style: none; margin: 2px 0 4px; padding: 0 0 0 6px; max-height: 0; overflow: hidden; transition: max-height var(--y-t); }
.nav-group.open .nav-sub { max-height: 640px; }
.nav-sub .nav-link { padding: 8px 12px 8px 34px; font-size: 13px; }
.nav-sub .nav-link::after {
  content: ""; position: absolute; left: 18px; top: 50%; width: 5px; height: 5px; margin-top: -2.5px;
  border-radius: 50%; background: #cfd4dc; transition: var(--y-t);
}
.nav-sub .nav-link.active::after { background: var(--y-primary); }
.nav-sub .nav-link.active { background: var(--y-primary-soft); }
.nav-sub .nav-link.active::before { display: none; }

/* ---------- 5. Cards ---------- */
.y-card {
  background: var(--y-surface); border: 1px solid var(--y-border); border-radius: var(--y-r-lg);
  box-shadow: var(--y-shadow-sm);
}
.y-card-pad { padding: 20px 22px; }
.y-card-hd { padding: 18px 22px; border-bottom: 1px solid var(--y-border); display: flex; align-items: center; gap: 12px; }
.y-card-hd h3 { font-size: 15.5px; }
.y-card-bd { padding: 20px 22px; }
.y-card-hover { transition: var(--y-t); }
.y-card-hover:hover { box-shadow: var(--y-shadow-md); transform: translateY(-2px); border-color: var(--y-border-strong); }

/* Page header */
.y-page-hd { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; }
.y-page-hd h1 { font-size: 22px; }
.y-page-sub { color: var(--y-muted); font-size: 13.5px; margin-top: 4px; }

/* ---------- 6. Buttons ---------- */
.y-btn {
  --_bg: var(--y-surface); --_fg: var(--y-text); --_bd: var(--y-border);
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  height: 40px; padding: 0 16px; border-radius: var(--y-r-sm); border: 1px solid var(--_bd);
  background: var(--_bg); color: var(--_fg); font-family: inherit; font-size: 13.5px; font-weight: 600;
  cursor: pointer; transition: var(--y-t); white-space: nowrap; line-height: 1;
}
.y-btn:hover { filter: brightness(.98); }
.y-btn:active { transform: translateY(1px); }
.y-btn:disabled { opacity: .55; cursor: not-allowed; }
.y-btn .y-ic { font-size: 18px; }
.y-btn-sm { height: 32px; padding: 0 12px; font-size: 12.5px; }
.y-btn-lg { height: 46px; padding: 0 22px; font-size: 15px; }
.y-btn-block { width: 100%; }
.y-btn-primary { --_bg: var(--y-primary); --_fg: #fff; --_bd: var(--y-primary); box-shadow: var(--y-shadow-sm); }
.y-btn-primary:hover { --_bg: var(--y-primary-hover); }
.y-btn-danger  { --_bg: var(--y-danger); --_fg: #fff; --_bd: var(--y-danger); }
.y-btn-success { --_bg: var(--y-success); --_fg: #fff; --_bd: var(--y-success); }
.y-btn-ghost   { --_bg: transparent; --_bd: transparent; --_fg: var(--y-muted); }
.y-btn-ghost:hover { --_bg: var(--y-surface-2); --_fg: var(--y-text); }
.y-btn-outline-danger { --_bg: transparent; --_fg: var(--y-danger); --_bd: #f1c4c4; }
.y-btn-outline-danger:hover { --_bg: var(--y-danger-soft); }

/* ---------- 7. Forms ---------- */
.y-field { margin-bottom: 16px; }
.y-label { display: block; font-size: 12.5px; font-weight: 600; color: #3b4453; margin-bottom: 6px; }
.y-req { color: var(--y-danger); }
.y-input, .y-select, .y-textarea {
  width: 100%; height: 42px; padding: 0 13px; font-family: inherit; font-size: 14px; color: var(--y-text);
  background: var(--y-surface); border: 1px solid var(--y-border-strong); border-radius: var(--y-r-sm);
  transition: var(--y-t); outline: none;
}
.y-textarea { height: auto; min-height: 92px; padding: 10px 13px; resize: vertical; }
.y-input:focus, .y-select:focus, .y-textarea:focus { border-color: var(--y-primary); box-shadow: 0 0 0 3px var(--y-primary-soft); }
.y-input:disabled, .y-select:disabled { background: var(--y-surface-2); color: var(--y-muted); cursor: not-allowed; }
.y-input::placeholder, .y-textarea::placeholder { color: var(--y-faint); }
.y-select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 34px; }
.y-input-group { position: relative; display: flex; align-items: center; }
.y-input-group .y-input-ic { position: absolute; left: 12px; color: var(--y-faint); font-size: 18px; pointer-events: none; }
.y-input-group .y-input { padding-left: 38px; }

/* ---------- 8. Badges / chips ---------- */
.y-badge { display: inline-flex; align-items: center; gap: 5px; height: 22px; padding: 0 9px; border-radius: var(--y-r-pill);
  font-size: 11.5px; font-weight: 700; letter-spacing: -.01em; background: var(--y-surface-2); color: var(--y-muted); }
.y-badge-primary { background: var(--y-primary-soft); color: var(--y-primary-active); }
.y-badge-success { background: var(--y-success-soft); color: var(--y-success); }
.y-badge-warning { background: var(--y-warning-soft); color: var(--y-warning); }
.y-badge-danger  { background: var(--y-danger-soft);  color: var(--y-danger); }
.y-badge-info    { background: var(--y-info-soft);    color: var(--y-info); }
.y-dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

.y-chip { display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 13px; border-radius: var(--y-r-pill);
  border: 1px solid var(--y-border-strong); background: var(--y-surface); color: var(--y-muted); font-size: 12.5px; font-weight: 600; cursor: pointer; transition: var(--y-t); }
.y-chip:hover { border-color: var(--y-primary); color: var(--y-primary); }
.y-chip.active { background: var(--y-primary); border-color: var(--y-primary); color: #fff; }

/* ---------- 9. Tables ---------- */
.y-table-wrap { width: 100%; overflow-x: auto; border-radius: var(--y-r-md); }
.y-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.y-table thead th {
  position: sticky; top: 0; background: var(--y-surface-2); color: #45505f; font-weight: 700; text-align: left;
  padding: 12px 14px; border-bottom: 1px solid var(--y-border); white-space: nowrap; font-size: 12.5px;
}
.y-table tbody td { padding: 12px 14px; border-bottom: 1px solid var(--y-border); color: var(--y-text); vertical-align: middle; }
.y-table tbody tr { transition: background .12s; }
.y-table tbody tr:hover { background: var(--y-primary-softer); }
.y-table tbody tr:last-child td { border-bottom: none; }
.y-table .y-td-center { text-align: center; }
.y-table .y-td-right { text-align: right; }

/* ---------- 10. Stat / KPI ---------- */
.y-stat { display: flex; align-items: center; gap: 15px; padding: 18px 20px; }
.y-stat-ic { width: 50px; height: 50px; border-radius: 14px; display: grid; place-items: center; font-size: 26px; flex-shrink: 0; }
.y-stat-ic.i-blue { background: var(--y-primary-soft); color: var(--y-primary); }
.y-stat-ic.i-green { background: var(--y-success-soft); color: var(--y-success); }
.y-stat-ic.i-amber { background: var(--y-warning-soft); color: var(--y-warning); }
.y-stat-ic.i-cyan { background: var(--y-info-soft); color: var(--y-info); }
.y-stat-val { font-size: 24px; font-weight: 800; color: var(--y-heading); line-height: 1.1; letter-spacing: -.02em; }
.y-stat-lbl { font-size: 12.5px; color: var(--y-muted); margin-top: 3px; }

/* ---------- 11. Quick action tiles ---------- */
.y-tile {
  display: flex; align-items: center; gap: 14px; padding: 18px; border-radius: var(--y-r-lg);
  background: var(--y-surface); border: 1px solid var(--y-border); box-shadow: var(--y-shadow-xs);
  transition: var(--y-t); cursor: pointer; color: var(--y-text);
}
.y-tile:hover { box-shadow: var(--y-shadow-md); transform: translateY(-3px); border-color: var(--y-primary); color: var(--y-text); }
.y-tile-ic { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; font-size: 24px; flex-shrink: 0;
  background: var(--y-primary-soft); color: var(--y-primary); transition: var(--y-t); }
.y-tile:hover .y-tile-ic { background: var(--y-primary); color: #fff; }
.y-tile-tt { font-weight: 700; font-size: 14.5px; color: var(--y-heading); }
.y-tile-ds { font-size: 12px; color: var(--y-muted); margin-top: 2px; }
.y-tile-arrow { margin-left: auto; color: var(--y-faint); font-size: 20px; transition: var(--y-t); }
.y-tile:hover .y-tile-arrow { color: var(--y-primary); transform: translateX(3px); }

/* ---------- 12. Avatar / profile ---------- */
.y-avatar { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--y-primary), #4f7cf7); flex-shrink: 0; font-size: 14px; }
.y-profile-btn { display: flex; align-items: center; gap: 10px; padding: 5px 8px 5px 5px; border-radius: var(--y-r-pill);
  border: 1px solid var(--y-border); background: var(--y-surface); cursor: pointer; transition: var(--y-t); }
.y-profile-btn:hover { background: var(--y-surface-2); }
.y-profile-meta { text-align: left; line-height: 1.15; }
.y-profile-name { font-weight: 700; font-size: 13px; color: var(--y-heading); }
.y-profile-role { font-size: 11px; color: var(--y-muted); }

/* ---------- 13. Utilities ---------- */
.y-grid { display: grid; gap: 18px; }
.y-grid-2 { grid-template-columns: repeat(2, 1fr); }
.y-grid-3 { grid-template-columns: repeat(3, 1fr); }
.y-grid-4 { grid-template-columns: repeat(4, 1fr); }
.y-flex { display: flex; }
.y-items-center { align-items: center; }
.y-justify-between { justify-content: space-between; }
.y-gap-sm { gap: 8px; } .y-gap { gap: 14px; } .y-gap-lg { gap: 22px; }
.y-wrap { flex-wrap: wrap; }
.y-mt { margin-top: 18px; } .y-mt-lg { margin-top: 28px; }
.y-mb { margin-bottom: 18px; }
.y-muted { color: var(--y-muted); }
.y-divider { height: 1px; background: var(--y-border); border: 0; margin: 0; }
.y-empty { text-align: center; padding: 48px 20px; color: var(--y-muted); }
.y-empty-ic { font-size: 44px; color: var(--y-faint); margin-bottom: 10px; }

/* ---------- 13b. Link cards (바로가기/소식) ---------- */
.y-linkcard {
  display: flex; flex-direction: column; overflow: hidden; text-decoration: none; color: var(--y-text);
  background: var(--y-surface); border: 1px solid var(--y-border); border-radius: var(--y-r-lg);
  box-shadow: var(--y-shadow-xs); transition: var(--y-t); height: 100%;
}
.y-linkcard:hover { box-shadow: var(--y-shadow-md); transform: translateY(-3px); border-color: var(--y-border-strong); color: var(--y-text); }
.y-linkcard-media { position: relative; height: 118px; overflow: hidden; background: var(--y-surface-2); }
.y-linkcard-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.y-linkcard:hover .y-linkcard-media img { transform: scale(1.06); }
.y-linkcard-media.grad { display: grid; place-items: center; }
.y-linkcard-media.grad.g-blue  { background: linear-gradient(135deg,#1e3a8a,#2563eb); }
.y-linkcard-media.grad.g-green { background: linear-gradient(135deg,#065f46,#10b981); }
.y-linkcard-media .lc-logo { width: 54px; height: 54px; border-radius: 14px; background: #fff; display: grid; place-items: center; box-shadow: var(--y-shadow-sm); }
.y-linkcard-media .lc-logo img { width: 40px; height: 40px; object-fit: contain; }
.y-linkcard-badge { position: absolute; top: 10px; right: 10px; background: rgba(255,255,255,.92); color: var(--y-heading);
  font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: var(--y-r-pill); box-shadow: var(--y-shadow-xs); }
.y-linkcard-bd { padding: 14px 16px 16px; display: flex; align-items: flex-start; gap: 8px; }
.y-linkcard-tt { font-size: 13.5px; font-weight: 700; color: var(--y-heading); line-height: 1.4; }
.y-linkcard-tt small { display: block; font-weight: 500; color: var(--y-muted); font-size: 12px; margin-top: 2px; }
.y-linkcard-ext { margin-left: auto; color: var(--y-faint); font-size: 17px; flex-shrink: 0; transition: var(--y-t); }
.y-linkcard:hover .y-linkcard-ext { color: var(--y-primary); }

/* ---------- 13c. Footer ---------- */
.y-footer { margin-top: 34px; padding: 22px 6px 8px; border-top: 1px solid var(--y-border); color: var(--y-faint);
  font-size: 12px; line-height: 1.7; text-align: center; }

/* ---------- 14. Modal ---------- */
.y-modal-bg { position: fixed; inset: 0; z-index: 60; background: rgba(15,23,42,.5); display: none; align-items: center; justify-content: center; padding: 18px; }
.y-modal-bg.open { display: flex; }
.y-modal { background: var(--y-surface); border-radius: var(--y-r-lg); box-shadow: var(--y-shadow-lg); width: 100%; max-width: 460px; max-height: 90vh; overflow-y: auto; }
.y-modal-hd { padding: 18px 22px; border-bottom: 1px solid var(--y-border); display: flex; align-items: center; justify-content: space-between; }
.y-modal-hd h3 { font-size: 16px; }
.y-modal-bd { padding: 20px 22px; }
.y-modal-ft { padding: 16px 22px; border-top: 1px solid var(--y-border); display: flex; justify-content: flex-end; gap: 10px; }

/* ---------- 15. Toast ---------- */
.y-toast-wrap { position: fixed; top: calc(var(--y-topbar-h) + 12px); right: 16px; z-index: 80; display: flex; flex-direction: column; gap: 10px; }
.y-toast { display: flex; align-items: center; gap: 10px; background: var(--y-surface); border: 1px solid var(--y-border); border-left: 4px solid var(--y-primary);
  box-shadow: var(--y-shadow-md); border-radius: var(--y-r-sm); padding: 12px 16px; min-width: 240px; font-size: 13.5px; animation: y-slide-in .25s ease; }
.y-toast.ok { border-left-color: var(--y-success); }
.y-toast.err { border-left-color: var(--y-danger); }
@keyframes y-slide-in { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: none; } }

/* ---------- 15b. Bootstrap 호환 오버라이드 (기존 콘텐츠 재활용 페이지용) ----------
   기존 페이지는 Bootstrap 클래스(.card/.btn/.form-control/.table/.modal)를 사용.
   마크업을 안 바꾸고도 새 디자인 톤에 맞도록 최소 오버라이드만 적용. */
.app-shell .card { border: 1px solid var(--y-border); border-radius: var(--y-r-lg); box-shadow: var(--y-shadow-sm); }
.app-shell .card-body { display: flow-root; } /* float 버튼이 카드 밖으로 넘치지 않도록 clearfix */
.app-shell .card-title { color: var(--y-heading); font-weight: 700; }
.app-shell .card-subtitle { color: var(--y-muted); }
.app-shell .btn { border-radius: var(--y-r-sm); font-weight: 600; }
.app-shell .btn-primary { background-color: var(--y-primary); border-color: var(--y-primary); }
.app-shell .btn-primary:hover, .app-shell .btn-primary:focus { background-color: var(--y-primary-hover); border-color: var(--y-primary-hover); }
.app-shell .btn-outline-primary { color: var(--y-primary); border-color: var(--y-primary); }
.app-shell .btn-outline-primary:hover { background-color: var(--y-primary); border-color: var(--y-primary); }
.app-shell .form-control, .app-shell .form-select { border-radius: var(--y-r-sm); border-color: var(--y-border-strong); }
.app-shell .form-control:focus, .app-shell .form-select:focus { border-color: var(--y-primary); box-shadow: 0 0 0 3px var(--y-primary-soft); }
.app-shell .table { --bs-table-color: var(--y-text); }
.app-shell .table > :not(caption) > * > * { padding: 11px 12px; }
.app-shell .table.table-bordered { border-color: var(--y-border); }
.app-shell .badge.text-bg-primary, .app-shell .bg-primary { background-color: var(--y-primary) !important; }

/* Bootstrap 모달(.modal-dialog 하위)만 새 디자인 톤으로. 커스텀 오버레이 모달/페이지 #id 스타일은 건드리지 않음 */
.app-shell .modal-dialog .modal-content { border: 1px solid var(--y-border); border-radius: var(--y-r-lg); box-shadow: var(--y-shadow-lg); }
.app-shell .modal-dialog .modal-header  { border-bottom: 1px solid var(--y-border); padding: 18px 22px; }
.app-shell .modal-dialog .modal-title   { font-size: 16px; font-weight: 700; color: var(--y-heading); letter-spacing: -0.01em; }
.app-shell .modal-dialog .modal-body    { padding: 20px 22px; }
.app-shell .modal-dialog .modal-footer  { border-top: 1px solid var(--y-border); padding: 14px 22px; gap: 8px; }

/* ※ DataTables가 제공하는 요소(페이징/검색/길이 등)는 라이브러리 기본 스타일 그대로 둔다 (오버라이드 없음) */

/* ---------- 15c. 사이드바 모바일 헤더/닫기 ---------- */
.nav-mobile-head { display: none; align-items: center; justify-content: space-between; padding: 4px 6px 12px; margin-bottom: 6px; border-bottom: 1px solid var(--y-border); }
.nav-mobile-head img { height: 40px; width: auto; }

/* ---------- 16. Responsive ---------- */
@media (max-width: 991.98px) {
  .app-hamburger { display: grid; }
  .app-sidebar { transform: translateX(-100%); box-shadow: var(--y-shadow-lg); }
  .app-shell.nav-open .app-sidebar { transform: translateX(0); }
  .nav-mobile-head { display: flex; }
  .app-shell.nav-open .app-backdrop { opacity: 1; visibility: visible; }
  .app-main { margin-left: 0; }
  .y-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .y-grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .app-content { padding: 18px 14px 48px; }
  .y-grid-2, .y-grid-3, .y-grid-4 { grid-template-columns: 1fr; }
  .y-page-hd h1 { font-size: 19px; }
  .app-brand .brand-text { display: none; }
  .y-profile-meta { display: none; }
}