:root {
  --sa-bg: #f4f5f9;
  --sa-surface: #ffffff;
  --sa-border: #e0e2ea;
  --sa-text: #1c2130;
  --sa-text-dim: #656d82;
  --sa-accent: #4338ca;
  --sa-accent-hover: #372ea8;
  --sa-danger: #dc2626;
  --sa-danger-hover: #b91c1c;
  --sa-ok: #16a34a;
  --sa-warn: #d97706;
  --sa-radius: 10px;
  --sa-shadow: 0 1px 2px rgba(20, 20, 40, 0.06), 0 4px 16px rgba(20, 20, 40, 0.06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --sa-bg: #12131a;
    --sa-surface: #1b1d27;
    --sa-border: #2b2e3d;
    --sa-text: #e9eaf2;
    --sa-text-dim: #9497ab;
    --sa-accent: #7c6ef2;
    --sa-accent-hover: #9086f5;
    --sa-danger: #f87171;
    --sa-danger-hover: #fca5a5;
    --sa-ok: #4ade80;
    --sa-warn: #fbbf24;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--sa-bg);
  color: var(--sa-text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

.sa-shell { min-height: 100vh; display: flex; flex-direction: column; }

.sa-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--sa-surface);
  border-bottom: 1px solid var(--sa-border);
}

.sa-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.sa-brand-badge {
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--sa-accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800;
}

.sa-main { flex: 1; padding: 28px 24px; max-width: 1080px; margin: 0 auto; width: 100%; }

.sa-card {
  background: var(--sa-surface);
  border: 1px solid var(--sa-border);
  border-radius: var(--sa-radius);
  box-shadow: var(--sa-shadow);
  padding: 20px;
}

.sa-card + .sa-card { margin-top: 20px; }

.sa-card h2 { margin: 0 0 14px; font-size: 16px; }

.sa-login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 20px;
}

.sa-login-card { width: 100%; max-width: 380px; }

.sa-field { margin-bottom: 14px; display: flex; flex-direction: column; gap: 6px; }
.sa-field label { font-size: 13px; color: var(--sa-text-dim); font-weight: 600; }

.sa-input, .sa-select, input[type="time"], input[type="text"], input[type="email"], input[type="password"] {
  padding: 9px 11px;
  border: 1px solid var(--sa-border);
  border-radius: 8px;
  background: var(--sa-bg);
  color: var(--sa-text);
  font-size: 14px;
  width: 100%;
  font-family: inherit;
}
.sa-input:focus, input:focus, select:focus {
  outline: 2px solid var(--sa-accent);
  outline-offset: 1px;
}

.sa-btn {
  border: none;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--sa-accent);
  color: #fff;
  transition: background 0.12s ease;
}
.sa-btn:hover { background: var(--sa-accent-hover); }
.sa-btn:disabled { opacity: 0.55; cursor: not-allowed; }

.sa-btn-danger { background: var(--sa-danger); }
.sa-btn-danger:hover { background: var(--sa-danger-hover); }

.sa-btn-ghost {
  background: transparent;
  color: var(--sa-accent);
  border: 1px solid var(--sa-border);
}
.sa-btn-ghost:hover { background: var(--sa-bg); }

.sa-btn-sm { padding: 6px 10px; font-size: 13px; }

.sa-row { display: flex; gap: 10px; flex-wrap: wrap; }

.sa-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.sa-table th, .sa-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--sa-border); }
.sa-table th { color: var(--sa-text-dim); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.02em; }
.sa-table tr:last-child td { border-bottom: none; }

.sa-empty { color: var(--sa-text-dim); padding: 24px 0; text-align: center; font-size: 14px; }

.sa-error {
  background: color-mix(in srgb, var(--sa-danger) 12%, transparent);
  border: 1px solid var(--sa-danger);
  color: var(--sa-danger);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13.5px;
  margin-bottom: 14px;
}

.sa-hint { color: var(--sa-text-dim); font-size: 12.5px; margin-top: 4px; }

.sa-modal-backdrop {
  position: fixed; inset: 0; background: rgba(10, 10, 20, 0.45);
  display: flex; align-items: center; justify-content: center; padding: 20px; z-index: 50;
}
.sa-modal {
  background: var(--sa-surface);
  border-radius: var(--sa-radius);
  border: 1px solid var(--sa-border);
  padding: 22px;
  width: 100%; max-width: 420px;
  box-shadow: var(--sa-shadow);
}
.sa-modal h3 { margin: 0 0 16px; font-size: 16px; }
.sa-modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }

.sa-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 520px) {
  .sa-grid-2 { grid-template-columns: 1fr; }
  .sa-main { padding: 18px 14px; }
}

.sa-badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
  background: color-mix(in srgb, var(--sa-accent) 15%, transparent);
  color: var(--sa-accent);
}

.sa-logout-link { background: none; border: none; color: var(--sa-text-dim); cursor: pointer; font-size: 13.5px; }
.sa-logout-link:hover { color: var(--sa-text); }

.sa-success {
  background: color-mix(in srgb, var(--sa-ok) 12%, transparent);
  border: 1px solid var(--sa-ok);
  color: var(--sa-ok);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13.5px;
  margin-bottom: 14px;
}

.sa-table-wrap { overflow-x: auto; }
.sa-table { min-width: 560px; }

.sa-badge-ok { background: color-mix(in srgb, var(--sa-ok) 15%, transparent); color: var(--sa-ok); }
.sa-badge-warn { background: color-mix(in srgb, var(--sa-warn) 18%, transparent); color: var(--sa-warn); }
.sa-badge-muted { background: color-mix(in srgb, var(--sa-text-dim) 12%, transparent); color: var(--sa-text-dim); }

.sa-body { flex: 1; display: flex; min-height: 0; }
.sa-sidenav {
  width: 200px;
  flex-shrink: 0;
  background: var(--sa-surface);
  border-right: 1px solid var(--sa-border);
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.sa-navlink {
  text-align: left;
  background: none;
  border: none;
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--sa-text-dim);
  cursor: pointer;
}
.sa-navlink:hover { background: var(--sa-bg); color: var(--sa-text); }
.sa-navlink-active { background: color-mix(in srgb, var(--sa-accent) 14%, transparent); color: var(--sa-accent); }

.sa-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }

input[type="date"] {
  padding: 9px 11px;
  border: 1px solid var(--sa-border);
  border-radius: 8px;
  background: var(--sa-bg);
  color: var(--sa-text);
  font-size: 14px;
  font-family: inherit;
}

@media (max-width: 760px) {
  .sa-body { flex-direction: column; }
  .sa-sidenav {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--sa-border);
    padding: 10px;
  }
  .sa-navlink { flex-shrink: 0; }
  .sa-grid-3 { grid-template-columns: 1fr; }
}

@media print {
  body * { visibility: hidden; }
  .sa-report-print-area, .sa-report-print-area * { visibility: visible; }
  .sa-report-print-area { position: absolute; left: 0; top: 0; width: 100%; }
  .sa-no-print { display: none !important; }
}