:root {
  --blue: #2563EB;
  --blue-dark: #1D4ED8;
  --green: #16A34A;
  --green-light: #DCFCE7;
  --green-border: #86EFAC;
  --red: #DC2626;
  --red-light: #FEF2F2;
  --red-border: #FECACA;
  --text: #111827;
  --muted: #6B7280;
  --border: #E5E7EB;
  --bg: #F3F4F6;
  --card: #FFFFFF;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* ── Navbar ─────────────────────────────────────────────────────────────── */
.nav {
  background: var(--blue);
  color: #fff;
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-right { display: flex; align-items: center; gap: 0.75rem; }
.nav-user { font-size: 0.85rem; opacity: 0.85; }
.nav-link {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  padding: 0.3rem 0.625rem;
  border-radius: 6px;
  transition: background 0.15s;
}
.nav-link:hover { background: rgba(255,255,255,0.15); color: #fff; }

/* ── Layout ─────────────────────────────────────────────────────────────── */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}
.card-title {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

/* ── Auth pages ─────────────────────────────────────────────────────────── */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: var(--bg);
}
.auth-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 4px 32px rgba(0,0,0,0.07);
}
.auth-logo {
  text-align: center;
  margin-bottom: 2rem;
}
.auth-logo h1 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--blue);
  letter-spacing: -0.02em;
}
.auth-logo p {
  color: var(--muted);
  margin-top: 0.25rem;
  font-size: 0.9rem;
}
.auth-footer {
  text-align: center;
  margin-top: 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.auth-footer a {
  color: var(--blue);
  font-weight: 600;
  text-decoration: none;
}

/* ── Forms ──────────────────────────────────────────────────────────────── */
.field { margin-bottom: 1.1rem; }
label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
}
input[type=text], input[type=email], input[type=password],
input[type=date], select {
  width: 100%;
  padding: 0.6rem 0.875rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.9375rem;
  color: var(--text);
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
  -webkit-appearance: none;
}
input:focus, select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.12);
}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.6rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
  text-decoration: none;
  white-space: nowrap;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--blue); color: #fff; width: 100%; padding: 0.75rem; }
.btn-primary:hover { background: var(--blue-dark); }
.btn-secondary {
  background: #fff;
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { background: var(--bg); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; font-weight: 500; }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { background: #B91C1C; }

/* ── Clock section ──────────────────────────────────────────────────────── */
.clock-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  margin-bottom: 1.25rem;
  text-align: center;
}
.clock-date {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}
.clock-state {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.375rem;
}
.clock-time {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}
.clock-time.active { color: var(--green); }
.clock-duration {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1.75rem;
}
.btn-clock {
  padding: 1rem 3rem;
  font-size: 1.15rem;
  font-weight: 700;
  border: none;
  border-radius: 100px;
  cursor: pointer;
  transition: background 0.15s, transform 0.12s, box-shadow 0.15s;
  letter-spacing: 0.01em;
}
.btn-clock:active { transform: scale(0.97); }
.btn-clock-in {
  background: var(--green);
  color: #fff;
  box-shadow: 0 4px 16px rgba(22,163,74,0.3);
}
.btn-clock-in:hover {
  background: #15803D;
  box-shadow: 0 6px 20px rgba(22,163,74,0.4);
}
.btn-clock-out {
  background: var(--red);
  color: #fff;
  box-shadow: 0 4px 16px rgba(220,38,38,0.3);
}
.btn-clock-out:hover {
  background: #B91C1C;
  box-shadow: 0 6px 20px rgba(220,38,38,0.4);
}

/* ── Tables ─────────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th {
  text-align: left;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
td {
  padding: 0.875rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}
tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: #FAFAFA; }

/* ── Badges ─────────────────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge-green { background: var(--green-light); color: var(--green); }
.badge-gray  { background: var(--bg); color: var(--muted); }

/* ── Active workers ─────────────────────────────────────────────────────── */
.worker-list { display: flex; flex-direction: column; gap: 0.625rem; }
.worker-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--green-light);
  border: 1px solid var(--green-border);
  border-radius: 8px;
}
.worker-name { font-weight: 600; font-size: 0.9rem; }
.worker-since { font-size: 0.8rem; color: var(--green); font-weight: 500; }

/* ── Filters row ────────────────────────────────────────────────────────── */
.filters {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}
.filters .field { margin-bottom: 0; min-width: 160px; flex: 1; }
.filters label { font-size: 0.8rem; }

/* ── Alerts ─────────────────────────────────────────────────────────────── */
.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  margin-bottom: 1rem;
}
.alert-error { background: var(--red-light); color: var(--red); border: 1px solid var(--red-border); }
.alert-success { background: var(--green-light); color: var(--green); border: 1px solid var(--green-border); }

/* ── Empty state ────────────────────────────────────────────────────────── */
.empty {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

/* ── Totals bar ─────────────────────────────────────────────────────────── */
.summary-bar {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 1rem 1.5rem;
  background: var(--bg);
  border-top: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
}
.summary-stat { font-size: 0.875rem; color: var(--muted); }
.summary-stat strong { color: var(--text); }

@media (max-width: 600px) {
  .container { padding: 1rem 0.75rem; }
  .card, .clock-card { padding: 1.25rem 1rem; }
  .auth-card { padding: 1.75rem 1.25rem; }
  .btn-clock { padding: 0.875rem 2.25rem; font-size: 1.05rem; }
  th, td { padding: 0.625rem 0.75rem; }
}