:root {
  --primary: #0D6EFD;
  --primary-600: #0B5ED7;
  --success: #6ECB4B;
  --warning: #F59E0B;
  --danger: #EF4444;
  --bg: #F5F7FA;
  --surface: #FFFFFF;
  --text: #1F2430;
  --text-muted: #5A5A5A;
  --border: #E4E8EF;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-md: 0 4px 16px rgba(16, 24, 40, .08);
  --sidebar-w: 248px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F141C;
    --surface: #161D29;
    --text: #E7ECF3;
    --text-muted: #9AA6B8;
    --border: #232C3B;
    --shadow: none;
    --shadow-md: 0 4px 16px rgba(0, 0, 0, .4);
  }
}

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }

/* ---------- Layout z sidebarem ---------- */
.app { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 20px 14px;
  position: fixed;
  inset: 0 auto 0 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 10px 18px;
  font-weight: 600; font-size: 17px;
}
.brand .dot {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--primary); color: #fff;
  display: grid; place-items: center; font-size: 14px; font-weight: 700;
}

.nav-link {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  color: var(--text-muted); font-weight: 500; font-size: 14px;
  transition: background .15s, color .15s;
}
.nav-link:hover { background: var(--bg); color: var(--text); }
.nav-link.active { background: rgba(13, 110, 253, .1); color: var(--primary); }
.nav-link svg { width: 18px; height: 18px; flex-shrink: 0; }

.sidebar-foot { margin-top: auto; border-top: 1px solid var(--border); padding-top: 14px; }

.main { margin-left: var(--sidebar-w); flex: 1; min-width: 0; }

.topbar {
  height: 64px; background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 28px; position: sticky; top: 0; z-index: 10;
}
.topbar h1 { font-size: 18px; font-weight: 600; }
.user-chip {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: var(--text-muted);
}
.avatar {
  width: 34px; height: 34px; border-radius: 50%;
  background: var(--primary); color: #fff;
  display: grid; place-items: center; font-weight: 600; font-size: 13px;
}

.content { padding: 28px; max-width: 1200px; }

/* ---------- KPI ---------- */
.kpi-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 18px; margin-bottom: 28px;
}
.kpi-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px;
  box-shadow: var(--shadow);
}
.kpi-card .label { font-size: 13px; color: var(--text-muted); font-weight: 500; }
.kpi-card .value { font-size: 30px; font-weight: 700; margin-top: 6px; letter-spacing: -.02em; }
.kpi-card .accent-warn { color: var(--warning); }

/* ---------- Karty / tabele ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  overflow: hidden;
}
.card-head { padding: 18px 20px; border-bottom: 1px solid var(--border); font-weight: 600; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 13px 20px; font-size: 14px; }
th { color: var(--text-muted); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
tbody tr { border-top: 1px solid var(--border); }

.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600;
}
.badge-vat { background: rgba(13,110,253,.12); color: var(--primary); }
.badge-zus { background: rgba(245,158,11,.14); color: #B45309; }
.badge-soon { background: rgba(239,68,68,.12); color: var(--danger); }

/* ---------- Auth ---------- */
.auth-wrap {
  min-height: 100vh; display: grid; place-items: center;
  background: var(--bg); padding: 20px;
}
.auth-card {
  width: 100%; max-width: 400px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-md);
  padding: 36px 32px;
}
.auth-card .brand { justify-content: center; padding-bottom: 24px; }
.auth-card h2 { font-size: 20px; font-weight: 600; text-align: center; margin-bottom: 4px; }
.auth-card .sub { text-align: center; color: var(--text-muted); font-size: 14px; margin-bottom: 26px; }

label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 6px; }
input[type=email], input[type=password], input[type=text] {
  width: 100%; padding: 11px 13px; font-size: 14px; font-family: var(--font);
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  margin-bottom: 16px; transition: border-color .15s;
}
input:focus { outline: none; border-color: var(--primary); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; padding: 12px; font-size: 15px; font-weight: 600; font-family: var(--font);
  background: var(--primary); color: #fff; border: none;
  border-radius: var(--radius-sm); cursor: pointer; transition: background .15s;
}
.btn:hover { background: var(--primary-600); }

.alert {
  padding: 11px 14px; border-radius: var(--radius-sm); font-size: 14px;
  margin-bottom: 18px;
  background: rgba(239,68,68,.1); color: var(--danger);
  border: 1px solid rgba(239,68,68,.25);
}

/* ---------- Responsywność (Mobile First fallback) ---------- */
@media (max-width: 860px) {
  .sidebar { transform: translateX(-100%); transition: transform .2s; z-index: 30; }
  .sidebar.open { transform: none; }
  .main { margin-left: 0; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .kpi-grid { grid-template-columns: 1fr; }
  .content { padding: 18px; }
}

/* ---------- Faza 3: kadry ---------- */
.page-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 22px; gap: 16px; flex-wrap: wrap;
}
.btn-sm {
  display: inline-flex; align-items: center; gap: 7px;
  width: auto; padding: 9px 16px; font-size: 14px; font-weight: 600;
  background: var(--primary); color: #fff; border: none;
  border-radius: var(--radius-sm); cursor: pointer; text-decoration: none;
}
.btn-sm:hover { background: var(--primary-600); color: #fff; }
.btn-ghost {
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg); color: var(--text); }

.search-bar { display: flex; gap: 10px; align-items: center; }
.search-bar input { margin: 0; max-width: 280px; }

.table-link { font-weight: 500; color: var(--text); }
.table-link:hover { color: var(--primary); }

.status-pill { padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.status-aktywny { background: rgba(110,203,75,.16); color: #3D7C1E; }
.status-nieaktywny { background: rgba(90,90,90,.14); color: var(--text-muted); }
.status-zwolniony { background: rgba(239,68,68,.12); color: var(--danger); }

@media (prefers-color-scheme: dark) {
  .status-aktywny { color: #9BE07A; }
  .status-zwolniony { color: #FCA5A5; }
}

.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 22px; }
.form-grid .full { grid-column: 1 / -1; }
.field-error { color: var(--danger); font-size: 12px; margin: -10px 0 14px; }
select {
  width: 100%; padding: 11px 13px; font-size: 14px; font-family: var(--font);
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  margin-bottom: 16px;
}
select:focus { outline: none; border-color: var(--primary); }

.form-actions { display: flex; gap: 12px; margin-top: 8px; }
.form-actions .btn-sm { padding: 11px 22px; }

.detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 28px; padding: 20px; }
.detail-item .k { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .04em; }
.detail-item .v { font-size: 15px; margin-top: 2px; }

.checkbox-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 16px; }
.checkbox-grid label {
  display: flex; align-items: center; gap: 8px; font-weight: 400; font-size: 14px;
  padding: 9px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
  cursor: pointer; margin: 0;
}
.checkbox-grid input { width: auto; margin: 0; }

.section-gap { margin-top: 28px; }
.tag-typ { font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 6px; background: rgba(13,110,253,.1); color: var(--primary); }
.empty { padding: 22px 20px; color: var(--text-muted); font-size: 14px; }
.pagination { display: flex; gap: 8px; margin-top: 18px; }
.pagination a, .pagination span {
  padding: 7px 13px; border-radius: var(--radius-sm); font-size: 14px;
  border: 1px solid var(--border); color: var(--text-muted);
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); }
.pagination .current { background: var(--primary); color: #fff; border-color: var(--primary); }

@media (max-width: 600px) {
  .form-grid, .detail-grid, .checkbox-grid { grid-template-columns: 1fr; }
}