:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --blue: #1d4ed8;
  --blue-soft: #eff6ff;
  --green: #15803d;
  --green-soft: #ecfdf5;
  --amber: #b45309;
  --amber-soft: #fffbeb;
  --red: #b91c1c;
  --red-soft: #fef2f2;
  --shadow: 0 18px 60px rgba(15, 23, 42, .08);
  --shadow-sm: 0 8px 24px rgba(15, 23, 42, .06);
  --radius: 18px;
  --radius-md: 12px;
  --control-h: 44px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% -10%, rgba(29, 78, 216, .14), transparent 28rem),
    radial-gradient(circle at 90% 0%, rgba(14, 165, 233, .12), transparent 25rem),
    var(--bg);
}
button, input, select { font: inherit; }
button { cursor: pointer; }
.shell { min-height: 100vh; display: grid; grid-template-columns: 280px 1fr; align-items: stretch; }
.sidebar {
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  border-right: 1px solid var(--line);
  padding: 24px;
  position: sticky;
  top: 0;
  min-height: 100vh;
  height: 100vh;
  align-self: start;
}
.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
.logo {
  width: 42px; height: 42px; border-radius: 14px;
  background: linear-gradient(135deg, #0f172a, #1d4ed8);
  color: white; display: grid; place-items: center; font-weight: 800;
  box-shadow: 0 12px 30px rgba(29,78,216,.25);
}
.brand h1 { font-size: 18px; line-height: 1.1; margin: 0; }
.brand span { color: var(--muted); font-size: 12px; }
.nav { display: grid; gap: 8px; }
.nav button {
  border: 0; border-radius: 14px; padding: 12px 14px; text-align: left;
  color: #334155; background: transparent; font-weight: 650;
}
.nav button.active, .nav button:hover { background: var(--blue-soft); color: var(--blue); }
.userbox { position: absolute; bottom: 24px; left: 24px; right: 24px; padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: white; }
.userbox strong { display: block; font-size: 14px; }
.userbox span { color: var(--muted); font-size: 12px; }
.userbox button { margin-top: 10px; width: 100%; }
.main { padding: 32px; max-width: 1220px; width: 100%; }
.header { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; margin-bottom: 24px; }
.eyebrow { color: var(--blue); font-weight: 800; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 8px; }
h2 { margin: 0; font-size: 32px; letter-spacing: -.03em; }
p.lead { margin: 8px 0 0; color: var(--muted); max-width: 720px; line-height: 1.55; }
.card { background: rgba(255,255,255,.96); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.card.pad { padding: 22px; }
.grid { display: grid; gap: 16px; }
.grid.stats { grid-template-columns: repeat(4, minmax(0,1fr)); margin-bottom: 18px; }
.two-col-grid { grid-template-columns: repeat(2, minmax(0,1fr)); align-items: start; }
.two-col-form { grid-template-columns: repeat(2, minmax(0,1fr)); align-items: end; }
.four-col-grid { grid-template-columns: repeat(4, minmax(0,1fr)); }
.detail-grid { grid-template-columns: 1.35fr .65fr; }
.participant-form { grid-template-columns: 1fr 1fr 1fr auto; align-items: end; }
.occurrence-form { grid-template-columns: repeat(2, minmax(0,1fr)); align-items: end; }
.occurrence-form .btn { grid-column: 1 / -1; }
.filter-card { margin-bottom: 16px; }
.filter-grid { display: grid; gap: 16px; grid-template-columns: minmax(260px, 1.6fr) repeat(2, minmax(170px, 1fr)) minmax(210px, 1.1fr) minmax(170px, 1fr); align-items: end; }
.filter-grid .btn { align-self: end; }
.relative-field { position: relative; }
.span-all { grid-column: 1 / -1; }
.span-from-2 { grid-column: 2 / -1; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-5 { margin-top: 20px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.p-2 { padding: 10px; }
.full-width { width: 100%; }
.text-amber { color: var(--amber); }
.stat { padding: 18px; }
.stat span { color: var(--muted); font-size: 13px; font-weight: 650; }
.stat strong { display: block; margin-top: 8px; font-size: 32px; letter-spacing: -.04em; }
.table { width: 100%; min-width: 920px; border-collapse: collapse; overflow: hidden; }
.table th { text-align: left; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .07em; padding: 14px 16px; border-bottom: 1px solid var(--line); background: var(--panel-soft); }
.table td { padding: 16px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.table th:first-child, .table td:first-child { white-space: nowrap; }
.table th:last-child, .table td:last-child { text-align: right; }
.table tr:last-child td { border-bottom: 0; }
.badge { display: inline-flex; align-items: center; gap: 7px; padding: 7px 10px; border-radius: 999px; font-size: 12px; font-weight: 800; white-space: nowrap; }
.badge::before { content: ''; width: 7px; height: 7px; border-radius: 999px; background: currentColor; }
.badge.ok { background: var(--green-soft); color: var(--green); }
.badge.active { background: var(--blue-soft); color: var(--blue); }
.badge.warn { background: var(--amber-soft); color: var(--amber); }
.badge.danger { background: var(--red-soft); color: var(--red); }
.btn { min-height: var(--control-h); border: 0; background: var(--blue); color: white; border-radius: var(--radius-md); padding: 0 16px; font-weight: 800; box-shadow: 0 12px 26px rgba(29, 78, 216, .18); display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
.btn.secondary { color: #334155; background: white; border: 1px solid var(--line); box-shadow: none; }
.btn.ghost { color: var(--blue); background: var(--blue-soft); box-shadow: none; }
.btn.danger { background: var(--red); }
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login { width: min(450px, 100%); padding: 30px; }
.login .logo { margin-bottom: 18px; }
.login form { display: grid; gap: 14px; }
.field { display: grid; gap: 8px; margin: 0; }
.field label { font-size: 13px; color: #334155; font-weight: 800; }
.field input, .field select, .table input, .table select { width: 100%; min-height: var(--control-h); border: 1px solid var(--line); background: white; border-radius: var(--radius-md); padding: 0 13px; outline: none; color: var(--text); }
.field input:focus, .field select:focus, .table input:focus, .table select:focus, .textarea-control:focus { border-color: #93c5fd; box-shadow: 0 0 0 4px #dbeafe; }
.textarea-control { width: 100%; border: 1px solid var(--line); border-radius: var(--radius-md); padding: 12px; outline: none; resize: vertical; }
.hint { color: var(--muted); font-size: 13px; line-height: 1.45; }
.error { color: var(--red); background: var(--red-soft); border: 1px solid #fecaca; border-radius: 12px; padding: 10px 12px; margin-top: 12px; }
.session-cards { display: grid; gap: 14px; }
.session-card { padding: 18px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.session-card h3 { margin: 0 0 7px; font-size: 17px; }
.mobile-session-list { display: none; }
.mobile-session-card { display: grid; gap: 14px; }
.session-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.session-card-top strong { line-height: 1.35; }
.mobile-session-meta { display: grid; gap: 6px; color: var(--muted); font-size: 13px; }
.mobile-session-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.meta { color: var(--muted); font-size: 13px; display: flex; gap: 8px 14px; flex-wrap: wrap; }
.meta span { display: inline-flex; align-items: center; gap: 8px; }
.meta span:not(:last-child)::after { content: ''; width: 4px; height: 4px; border-radius: 999px; background: #cbd5e1; }
.team-panel { grid-template-columns: repeat(3, minmax(0,1fr)); margin: 14px 0; }
.team-panel .stat strong { font-size: 18px; }
.stat-value-sm { font-size: 18px !important; }
.role-warning { margin: -2px 0 14px; border-color: #fcd34d; background: var(--amber-soft); }
.weekday-grid { display: grid; grid-template-columns: repeat(7, minmax(0,1fr)); gap: 8px; }
.weekday-grid label { border: 1px solid var(--line); border-radius: 12px; padding: 10px; background: white; text-align: center; color: #334155; }
.attendance { display: grid; gap: 10px; }
.student-row { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px; padding: 12px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.note-details { margin-top: 8px; color: var(--muted); font-size: 13px; }
.note-details summary { cursor: pointer; font-weight: 700; }
.note-details input { margin-top: 8px; width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 10px 11px; }
.segment { display: flex; padding: 4px; gap: 4px; border-radius: 999px; background: #eef2f7; }
.segment button { border: 0; border-radius: 999px; padding: 8px 11px; min-height: 40px; background: transparent; color: #475569; font-size: 12px; font-weight: 850; }
.segment button.selected.present { background: var(--green); color: white; }
.segment button.selected.absent { background: var(--red); color: white; }
.segment button.selected.late { background: var(--amber); color: white; }
.toolbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.submit-panel { margin-top: 16px; display: flex; justify-content: space-between; gap: 16px; align-items: center; flex-wrap: wrap; }
.empty { text-align: center; padding: 36px 20px; color: var(--muted); }
.kpis { display: flex; gap: 6px; flex-wrap: nowrap; }
.count-pill { padding: 6px 8px; border-radius: 999px; background: #f1f5f9; color: #334155; font-size: 12px; font-weight: 800; white-space: nowrap; }
.submission-meta { margin-top: 14px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; color: #334155; }
.submission-meta strong { font-size: 13px; }
.submission-meta span { color: var(--muted); font-size: 13px; }
.submission-meta.muted { color: var(--muted); }
.edit-policy { margin-top: 12px; padding: 12px; border-radius: 14px; display: grid; gap: 4px; }
.edit-policy.open { background: var(--blue-soft); color: var(--blue); }
.edit-policy.locked { background: var(--amber-soft); color: var(--amber); }
.edit-policy span { color: #475569; font-size: 13px; }
button:disabled { opacity: .55; cursor: not-allowed; box-shadow: none; }
@media (max-width: 820px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { height: auto; min-height: 0; position: static; padding: 10px 14px; }
  .brand { margin-bottom: 10px; }
  .brand .logo { width: 34px; height: 34px; border-radius: 11px; }
  .brand h1 { font-size: 16px; }
  .brand span { display: none; }
  .nav { grid-template-columns: repeat(4, minmax(0,1fr)); gap: 6px; }
  .nav button { text-align: center; padding: 9px 6px; font-size: 12px; border-radius: 11px; }
  .userbox { display: none; }
  .main { padding: 18px; }
  .grid.stats { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .two-col-grid, .two-col-form, .four-col-grid, .detail-grid, .participant-form, .occurrence-form, .filter-grid { grid-template-columns: 1fr; }
  .span-from-2 { grid-column: 1 / -1; }
  .team-panel { grid-template-columns: 1fr; }
  .weekday-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .header { display: block; }
  h2 { font-size: 26px; }
  .table-wrap { overflow-x: auto; }
  .desktop-table { display: none; }
  .mobile-session-list { display: grid; gap: 12px; }
  .session-card { display: grid; }
  .student-row { grid-template-columns: 1fr; }
  .segment { width: 100%; display: grid; grid-template-columns: repeat(3,1fr); }
  .segment button { min-height: 48px; font-size: 13px; }
  .note-details input { min-height: 44px; }
}
.suggestions {
  position: absolute;
  z-index: 20;
  left: 0;
  right: 0;
  top: calc(100% + 6px);
  background: white;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.suggestions:empty { display: none; }
.suggestions button {
  width: 100%;
  border: 0;
  background: white;
  padding: 11px 12px;
  display: grid;
  gap: 3px;
  text-align: left;
}
.suggestions button:hover { background: var(--blue-soft); }
.suggestions span { color: var(--muted); font-size: 12px; }