:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #1e40af;
  --primary-hover: #1e3a8a;
  --whatsapp: #16a34a;
  --amber: #d97706;
  --danger: #dc2626;
  --border: #e2e8f0;
  --radius: 10px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans Sinhala", sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 16px;
}

.app-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-badge {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  display: grid;
  place-items: center;
}

.brand h1 {
  font-size: 1.15rem;
}

.brand p {
  font-size: 0.8rem;
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  background: #fff;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.btn-primary, .btn-whatsapp, .btn-success, .btn-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  color: #fff;
}

.btn-primary { background: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-whatsapp { background: var(--whatsapp); }
.btn-success { background: #15803d; }
.btn-danger { background: var(--danger); }

.btn-outline-sm {
  padding: 6px 12px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-block { width: 100%; }
.hidden { display: none !important; }
.icon-inline { width: 18px; height: 18px; }

@media (max-width: 520px) {
  .form-row { grid-template-columns: 1fr; }
}