:root {
  --bg:          #080c14;
  --surface:     #0f1623;
  --card:        #131b2a;
  --border:      rgba(148,163,184,0.08);
  --border-hi:   rgba(148,163,184,0.16);
  --text-1:      #f1f5f9;
  --text-2:      #94a3b8;
  --text-3:      #475569;
  --urgent:      #f87171;
  --urgent-dim:  rgba(248,113,113,0.14);
  --warning:     #fbbf24;
  --warning-dim: rgba(251,191,36,0.14);
  --ok:          #34d399;
  --ok-dim:      rgba(52,211,153,0.14);
  --accent:      #818cf8;
  --accent-dim:  rgba(129,140,248,0.14);
  --sidebar-w:   176px;
  --admin-row-h: 38px;
  --course-row-h: 66px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Outfit', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text-1);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

/* ── 로그인 ───────────────────────────────── */
#login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 60% 40% at 50% -5%, rgba(129,140,248,0.2) 0%, transparent 65%),
    var(--bg);
}

.login-box {
  width: 100%;
  max-width: 340px;
  padding: 44px 36px;
  background: var(--surface);
  border: 1px solid var(--border-hi);
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 32px 80px rgba(0,0,0,0.6);
}

.login-logo { font-size: 30px; display: block; margin-bottom: 14px; }
.login-box h1 { font-size: 18px; font-weight: 700; letter-spacing: -0.3px; margin-bottom: 5px; }
.login-box .subtitle { color: var(--text-3); font-size: 13px; margin-bottom: 28px; }

.login-box input {
  width: 100%; padding: 12px 15px;
  background: var(--bg); border: 1px solid var(--border-hi); border-radius: 10px;
  color: var(--text-1); font-family: inherit; font-size: 14px;
  margin-bottom: 10px; outline: none; transition: border-color 0.2s;
}
.login-box input:focus { border-color: var(--accent); }
.login-box input::placeholder { color: var(--text-3); }

.login-box button {
  width: 100%; padding: 12px;
  background: var(--accent); color: #0a0a18; border: none; border-radius: 10px;
  font-family: inherit; font-size: 14px; font-weight: 700; cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}
.login-box button:hover { opacity: 0.88; }
.login-box button:active { transform: scale(0.98); }
.login-error { color: var(--urgent); font-size: 13px; margin-top: 10px; }

/* ── 레이아웃 ───────────────────────────────── */
#dashboard-screen {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── 사이드바 ───────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  scrollbar-width: none;
}
.sidebar::-webkit-scrollbar { display: none; }

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 18px 16px 14px;
  border-bottom: 1px solid var(--border);
}
.brand-icon { font-size: 18px; }
.brand-name { font-size: 15px; font-weight: 800; letter-spacing: -0.3px; color: var(--text-1); }

.nav-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 14px 16px 6px;
}

#admin-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s;
}
.nav-item:hover { background: rgba(255,255,255,0.05); color: var(--text-1); }
.nav-item.active { background: var(--accent-dim); color: var(--accent); font-weight: 600; }

.nav-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
.nav-dot.dot-urgent  { background: var(--urgent); }
.nav-dot.dot-warning { background: var(--warning); }
.nav-dot.dot-ok      { background: var(--ok); }

.sidebar-footer {
  padding: 10px 8px 14px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 7px 10px;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--text-3);
  font-family: inherit;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
}
.footer-btn:hover { background: rgba(255,255,255,0.05); color: var(--text-2); }
.footer-btn.danger:hover { color: var(--urgent); }

/* ── 메인 영역 ───────────────────────────────── */
.main-area {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.table-wrapper {
  flex: 1;
  overflow: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-hi) transparent;
}
.table-wrapper::-webkit-scrollbar { width: 5px; height: 5px; }
.table-wrapper::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 3px; }

/* ── 테이블 ───────────────────────────────── */
#task-table {
  border-collapse: collapse;
  width: max-content;
  min-width: 100%;
}

/* 코너 셀 (업무 라벨) */
.th-corner {
  position: sticky;
  top: 0;
  left: 0;
  z-index: 40;
  width: 156px;
  min-width: 156px;
  height: var(--admin-row-h);
  background: var(--bg);
  border-right: 1px solid var(--border-hi);
  border-bottom: 1px solid var(--border-hi);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 0 14px;
  text-align: left;
}

/* 담당자 헤더 행 */
thead tr:first-child th.th-admin {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--admin-row-h);
  padding: 0 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.1px;
  text-align: left;
  border-right: 1px solid var(--border-hi);
  border-bottom: 1px solid var(--border);
}

.th-admin-urgent  { background: rgba(248,113,113,0.08); color: var(--urgent); }
.th-admin-warning { background: rgba(251,191,36,0.08);  color: var(--warning); }
.th-admin-ok      { background: rgba(52,211,153,0.08);  color: var(--ok); }

/* 과정 헤더 행 */
thead tr:nth-child(2) th.th-course {
  position: sticky;
  top: var(--admin-row-h);
  z-index: 25;
  height: var(--course-row-h);
  min-width: 128px;
  max-width: 160px;
  padding: 8px 12px;
  background: var(--card);
  border-right: 1px solid var(--border);
  border-bottom: 2px solid var(--border-hi);
  vertical-align: top;
}

.th-course-name {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-1);
  line-height: 1.4;
  margin-bottom: 2px;
}

.th-course-sub {
  font-size: 10.5px;
  font-weight: 400;
  color: var(--text-2);
  margin-bottom: 2px;
  line-height: 1.3;
}

.th-course-date { font-size: 10.5px; color: var(--text-3); }

.th-course-urgent  { border-top: 2px solid var(--urgent); }
.th-course-warning { border-top: 2px solid var(--warning); }
.th-course-ok      { border-top: 2px solid var(--ok); }

/* 업무명 셀 */
.td-task {
  position: sticky;
  left: 0;
  z-index: 15;
  width: 156px;
  min-width: 156px;
  padding: 0 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  background: var(--surface);
  border-right: 1px solid var(--border-hi);
  white-space: nowrap;
}

/* 데이터 셀 */
.td-cell {
  padding: 0 10px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.12s;
  text-align: center;
}
.td-cell:hover { background: rgba(255,255,255,0.04); }
.td-done { background: rgba(52,211,153,0.04); }
.td-empty { color: var(--text-3); font-size: 12px; cursor: default; }

.cell-in {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 38px;
}

.cell-chk {
  width: 14px; height: 14px;
  border: 1.5px solid var(--text-3);
  border-radius: 4px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
}
.cell-chk.chk-on { background: var(--ok); border-color: var(--ok); }
.cell-chk.chk-on::after {
  content: '✓';
  color: #080c14;
  font-size: 9px;
  font-weight: 800;
  line-height: 1;
}

.cell-bdg {
  font-size: 10.5px;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: 0.2px;
}
.bdg-urgent  { background: var(--urgent-dim);  color: var(--urgent); }
.bdg-warning { background: var(--warning-dim); color: var(--warning); }
.bdg-ok      { background: var(--ok-dim);      color: var(--ok); }
.bdg-done    { background: transparent;         color: var(--text-3); font-weight: 500; }
.bdg-overdue { background: rgba(100,100,100,0.12); color: var(--text-3); }

/* 짝수/홀수 행 */
tbody tr:nth-child(odd) .td-task   { background: var(--surface); }
tbody tr:nth-child(even) .td-task  { background: #111924; }
tbody tr:nth-child(even) .td-cell  { background: rgba(255,255,255,0.015); }
tbody tr:nth-child(even) .td-cell:hover { background: rgba(255,255,255,0.05); }
tbody tr:nth-child(even) .td-done  { background: rgba(52,211,153,0.06); }

tbody tr td { height: 38px; }

.empty-msg {
  padding: 60px 40px;
  color: var(--text-3);
  font-size: 14px;
  text-align: center;
}