:root {
  /* Dark Theme Defaults */
  --bg: #0f172a; /* navy dark */
  --card: #111827;
  --muted: #9ca3af; /* slightly brighter muted text */
  --text: #f3f4f6;
  --primary: #2563eb; /* professional blue */
  --primary-dark: #1e3a8a;
  --accent: #3b82f6;
  --danger: #ef4444;
  --warn: #f59e0b;
  --ring: 0 0 0 3px rgba(37,99,235,.25);
  --transition: all 0.3s ease;
}

/* Light Theme Overrides */
body.light-theme {
  --bg: #f9fafb; 
  --card: #ffffff;
  --muted: #6b7280;
  --text: #1f2937;
  --primary: #2563eb;
  --primary-dark: #1e3a8a;
  --accent: #3b82f6;
  --danger: #dc2626;
  --warn: #f59e0b;
  --ring: 0 0 0 3px rgba(37,99,235,.25);
}

/* Global */
html, body {
  height: 100%;
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: var(--transition);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: linear-gradient(90deg, var(--primary-dark), var(--primary));
  border-bottom: 2px solid var(--primary-dark);
}
body.light-theme .header {
  background: linear-gradient(90deg, #ffffff, #f3f4f6);
  border-color: #e5e7eb;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
}

.brand .logo {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--primary-dark));
  box-shadow: 0 6px 20px rgba(37,99,235,.25);
}
.brand h1 { 
  font-size: 18px; 
  font-weight: 700; 
  color: #fff; 
}

/* Card */
.card {
  background: var(--card);
  border-radius: 16px;
  padding: 20px;
  border: 1px solid rgba(148,163,184,.2);
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
}
body.light-theme .card {
  background: #fff;
  border: 1px solid #e5e7eb;
}

/* Responsive Grid */
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: 1fr; }
@media(min-width:768px){ .grid-2{ grid-template-columns: 1fr 1fr; } }

/* Typography */
h1{font-size:24px; margin-bottom:10px;}
h2{font-size:18px;color:var(--muted);}
p.muted{color:var(--muted); font-size:15px;}

/* Inputs & Buttons */
.input, select, textarea {
  width: 100%;
  padding: 14px 16px;
  border-radius: 10px;
  border:1px solid rgba(148,163,184,.3);
  background: var(--card);
  color: var(--text);
  font-size: 15px;
}
.input:focus { box-shadow: var(--ring); border-color: var(--primary); }

.btn {
  display:inline-flex; align-items:center; justify-content:center;
  padding:14px 18px; border-radius:12px; font-weight:600;
  background: var(--primary); color:#fff;
}
.btn:hover { background: var(--primary-dark); }

/* Table – mobile friendly */
.table { width:100%; border-collapse: separate; border-spacing:0 8px; font-size:14px; }
.table-wrapper { overflow-x: auto; }
.table thead th { font-size:12px; text-transform:uppercase; color:var(--muted); padding:8px; }
.table tbody tr { background:var(--card); }
body.light-theme .table tbody tr { background:#fff; }

/* Footer */
.footer{color:var(--muted);font-size:13px;text-align:center;padding:18px;}