:root {
  --color-primary: #1f4e5f;
  --color-primary-dark: #163a47;
  --color-accent: #2e7d6b;
  --color-accent-light: #e7f3ef;
  --color-warn: #b5651d;
  --color-warn-bg: #fff3e0;
  --color-danger: #b3382c;
  --color-danger-bg: #fbe9e7;
  --color-bg: #f5f7f7;
  --color-surface: #ffffff;
  --color-border: #e1e6e5;
  --color-text: #24312f;
  --color-text-muted: #667370;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(15, 35, 30, 0.06), 0 4px 14px rgba(15, 35, 30, 0.04);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
}

.app-shell { display: flex; min-height: 100vh; }

/* ---------- Sidebar ---------- */
.sidebar {
  width: 230px;
  flex-shrink: 0;
  background: var(--color-primary-dark);
  color: #dfeae7;
  display: flex;
  flex-direction: column;
  padding: 20px 0;
}
.sidebar-brand {
  font-size: 17px;
  font-weight: 700;
  color: #ffffff;
  padding: 0 20px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  margin-bottom: 12px;
  line-height: 1.3;
}
.sidebar-brand small { display: block; font-weight: 400; font-size: 12px; color: #a9c2bd; margin-top: 4px; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  color: #cfe3df;
  text-decoration: none;
  font-size: 14px;
  border-left: 3px solid transparent;
}
.nav-link:hover { background: rgba(255,255,255,0.06); color: #fff; }
.nav-link.active { background: rgba(255,255,255,0.09); color: #fff; border-left-color: var(--color-accent); font-weight: 600; }
.nav-icon { width: 18px; text-align: center; opacity: 0.9; }
.sidebar-footer { margin-top: auto; padding: 14px 20px 4px; font-size: 12px; color: #93aca6; }

/* ---------- Main area ---------- */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  height: 60px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}
.topbar-title { font-size: 18px; font-weight: 700; color: var(--color-primary-dark); }
.topbar-user { display: flex; align-items: center; gap: 14px; font-size: 14px; color: var(--color-text-muted); }
.logout-link { color: var(--color-danger); text-decoration: none; font-weight: 600; }

.content { padding: 26px; flex: 1; }

/* ---------- Cards / KPIs ---------- */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 16px; margin-bottom: 26px; }
.kpi-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow); }
.kpi-value { font-size: 30px; font-weight: 800; color: var(--color-primary); line-height: 1; }
.kpi-label { font-size: 13px; color: var(--color-text-muted); margin-top: 8px; }

.panel { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); box-shadow: var(--shadow); }
.panel-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 20px; border-bottom: 1px solid var(--color-border); }
.panel-header h2 { margin: 0; font-size: 16px; color: var(--color-primary-dark); }
.panel-body { padding: 20px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 9px 16px; border-radius: 7px; border: 1px solid transparent;
  font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none;
  transition: filter 0.12s ease;
}
.btn:hover { filter: brightness(0.94); }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-secondary { background: #fff; color: var(--color-text); border-color: var(--color-border); }
.btn-danger { background: var(--color-danger-bg); color: var(--color-danger); }
.btn-sm { padding: 5px 10px; font-size: 12.5px; }

/* ---------- Table ---------- */
table.data-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.data-table th {
  text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: 0.03em;
  color: var(--color-text-muted); padding: 10px 12px; border-bottom: 2px solid var(--color-border);
}
.data-table td { padding: 12px; border-bottom: 1px solid var(--color-border); vertical-align: middle; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: #fafcfb; }

.badge { display: inline-block; padding: 3px 9px; border-radius: 999px; font-size: 12px; font-weight: 700; }
.badge-active { background: var(--color-accent-light); color: var(--color-accent); }
.badge-inactive { background: #f1f1f1; color: #888; }
.badge-warn { background: var(--color-warn-bg); color: var(--color-warn); }
.badge-danger { background: var(--color-danger-bg); color: var(--color-danger); }

.empty-state { text-align: center; padding: 40px 20px; color: var(--color-text-muted); }

/* ---------- Forms ---------- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--color-text); }
.form-group input, .form-group select {
  padding: 9px 11px; border: 1px solid var(--color-border); border-radius: 7px; font-size: 14px;
  font-family: inherit; background: #fff;
}
.form-group input:focus, .form-group select:focus { outline: 2px solid var(--color-accent); outline-offset: 1px; }
.form-hint { font-size: 12px; color: var(--color-text-muted); }

/* ---------- Flash messages ---------- */
.flash { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-size: 14px; border-left: 4px solid; }
.flash-success { background: var(--color-accent-light); color: #1c5346; border-color: var(--color-accent); }
.flash-error { background: var(--color-danger-bg); color: var(--color-danger); border-color: var(--color-danger); }

/* ---------- Modal ---------- */
.modal-overlay {
  display: none; position: fixed; inset: 0; background: rgba(15,35,30,0.35);
  align-items: center; justify-content: center; z-index: 50; padding: 20px;
}
.modal-overlay.open { display: flex; }
.modal-box { background: #fff; border-radius: 12px; width: 100%; max-width: 480px; box-shadow: 0 20px 50px rgba(0,0,0,0.25); }
.modal-header { padding: 18px 22px; border-bottom: 1px solid var(--color-border); display: flex; justify-content: space-between; align-items: center; }
.modal-header h3 { margin: 0; font-size: 16px; }
.modal-close { background: none; border: none; font-size: 18px; cursor: pointer; color: var(--color-text-muted); }
.modal-body { padding: 20px 22px; }
.modal-footer { padding: 16px 22px; border-top: 1px solid var(--color-border); display: flex; justify-content: flex-end; gap: 10px; }

/* ---------- Login page ---------- */
.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, var(--color-primary-dark), var(--color-primary) 70%);
}
.login-card { background: #fff; border-radius: 14px; padding: 38px 36px; width: 100%; max-width: 380px; box-shadow: 0 20px 60px rgba(0,0,0,0.25); }
.login-brand { text-align: center; margin-bottom: 22px; }
.login-brand .dot { display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--color-accent); margin-right: 8px; }
.login-brand h1 { font-size: 19px; margin: 10px 0 2px; color: var(--color-primary-dark); }
.login-brand p { font-size: 13px; color: var(--color-text-muted); margin: 0; }
.login-card .btn-primary { width: 100%; justify-content: center; margin-top: 8px; padding: 11px; }

/* ---------- Credential card (for printing) ---------- */
.credential-card {
  width: 320px; border: 1.5px solid var(--color-primary); border-radius: 14px; padding: 18px;
  text-align: center; margin: 30px auto; font-family: "Segoe UI", sans-serif;
}
.credential-card h4 { margin: 4px 0 0; color: var(--color-primary-dark); font-size: 16px; }
.credential-card .grp { color: var(--color-text-muted); font-size: 13px; margin-bottom: 10px; }
.credential-card .school { font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-accent); font-weight: 700; }
#qr-canvas-holder { display: flex; justify-content: center; margin: 12px 0; }

@media print {
  .no-print { display: none !important; }
  .sidebar, .topbar { display: none !important; }
  .content { padding: 0 !important; }
}