:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #667085;
  --line: #e7eaf0;
  --primary: #0f62fe;
  --primary-dark: #0047bb;
  --danger: #d92d20;
  --success: #027a48;
  --warning-bg: #fff6e5;
  --shadow: 0 12px 30px rgba(16, 24, 40, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, Segoe UI, Arial, sans-serif;
}
a { color: var(--primary); text-decoration: none; }
label { display: block; margin: 0 0 6px; font-size: 13px; color: var(--muted); font-weight: 700; }
input, select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  font-size: 14px;
}
button, .button {
  border: 0;
  background: #eef4ff;
  color: var(--primary);
  padding: 10px 14px;
  border-radius: 12px;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
button.primary, .primary { background: var(--primary); color: #fff; }
button.primary:hover, .primary:hover { background: var(--primary-dark); }
button.ghost { background: transparent; color: var(--primary); padding: 5px 8px; }
.danger-text { color: var(--danger) !important; }

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 260px;
  padding: 22px;
  background: #081529;
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.brand { display: flex; gap: 12px; align-items: center; }
.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 15px;
  background: linear-gradient(135deg, #0f62fe, #24c8db);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 900;
}
.brand strong { display: block; }
.brand span { display: block; font-size: 12px; color: #a9b4c5; margin-top: 2px; }
.sidebar nav { display: grid; gap: 8px; }
.sidebar nav a {
  color: #cdd5e1;
  padding: 12px 14px;
  border-radius: 12px;
  font-weight: 700;
}
.sidebar nav a.active, .sidebar nav a:hover { background: rgba(255,255,255,0.1); color: #fff; }
.logout-form { margin-top: auto; }
.logout-form button { width: 100%; background: rgba(255,255,255,0.08); color: #fff; }

.main { margin-left: 260px; min-height: 100vh; padding: 24px; }
.topbar {
  height: 70px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  margin-bottom: 22px;
}
.topbar span { display: block; color: var(--muted); font-size: 13px; margin-top: 3px; }
.user-pill { background: #eef4ff; color: var(--primary); padding: 9px 12px; border-radius: 999px; font-weight: 800; }

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 6px 0 20px;
}
.page-header h1 { margin: 0; font-size: 30px; }
.page-header p { margin: 6px 0 0; color: var(--muted); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.card h2 { margin: 0 0 16px; font-size: 18px; }
.grid { display: grid; gap: 20px; }
.grid.cards { grid-template-columns: repeat(4, 1fr); }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
.metric span { display: block; color: var(--muted); font-weight: 700; }
.metric strong { display: block; font-size: 34px; margin-top: 8px; }
.metric.danger strong { color: var(--danger); }
.section-title { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 14px; }
.section-title h2 { margin: 0; }

.form-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; align-items: end; }
.form-grid.one { grid-template-columns: 1fr; }
.form-actions { align-self: end; }
.form-actions button { width: 100%; }

.alert { padding: 13px 15px; border-radius: 14px; margin-bottom: 16px; font-weight: 700; }
.alert.success { color: var(--success); background: #ecfdf3; }
.alert.error { color: var(--danger); background: #fef3f2; }
.badge { background: #f2f4f7; color: #344054; padding: 4px 9px; border-radius: 999px; font-size: 12px; font-weight: 800; }
.muted { color: var(--muted); }
.right { text-align: right; }
.actions { display: flex; gap: 8px; justify-content: flex-end; }
.low-stock { background: var(--warning-bg); }

table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; font-size: 14px; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
tr:last-child td { border-bottom: 0; }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at top left, #e5f1ff, transparent 40%), var(--bg);
  padding: 24px;
}
.login-card {
  width: min(450px, 100%);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow);
}
.login-card h1 { margin: 26px 0 8px; }
.login-card p { color: var(--muted); margin-bottom: 22px; }
.login-card form { display: grid; gap: 12px; }
.login-card small { display: block; color: var(--muted); margin-top: 16px; }
.login-brand span { color: var(--muted); }

@media (max-width: 980px) {
  .sidebar { position: static; width: auto; }
  .main { margin-left: 0; }
  .grid.cards, .grid.two, .form-grid { grid-template-columns: 1fr; }
  .page-header { align-items: flex-start; flex-direction: column; }
  table { display: block; overflow-x: auto; white-space: nowrap; }
}