:root {
  --bg: #0f172a;
  --panel: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --primary: #10b981;
  --primary-700: #059669;
  --border: #1f2937;
  --danger: #ef4444;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial,
    "Noto Sans Thai", "Noto Sans", sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px 16px 80px 16px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.4px;
  margin: 8px 0 16px 0;
}

.brand { }

.header-actions {
  display: flex;
  gap: 8px;
}

.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
}

.control-row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.label {
  white-space: nowrap;
}

input,
button,
select,
textarea {
  font-size: 16px; /* ป้องกัน zoom บน iOS */
}

.date-input {
  background: #0b1220;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}

.info-row {
  margin-top: 10px;
  color: var(--muted);
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}

.btn {
  background: var(--primary);
  color: #052316;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s ease, transform 0.08s ease;
  touch-action: manipulation; /* ลดโอกาส double-tap zoom */
}

.btn:hover {
  background: var(--primary-700);
}

.btn:active {
  transform: translateY(1px);
}

.btn.btn-secondary {
  background: #0b1220;
  color: var(--text);
  border-color: var(--border);
}

.btn-icon {
  padding: 10px 12px;
}

.table-section {
  margin-top: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.drug-table {
  width: 100%;
  border-collapse: collapse;
}

.drug-table thead th {
  text-align: center;
  background: #0b1220;
  color: var(--muted);
  font-weight: 600;
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.drug-table tbody td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

td input {
  text-align: right;
}

th:nth-child(3), td:nth-child(3),
th:nth-child(2), td:nth-child(2) {
  text-align: right;
}

.drug-name {
  font-weight: 600;
}

.drug-formula {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
  display: none;
}

.per-meal-input {
  width: 100%;
  max-width: 90px;
  background: #0b1220;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
}

.result-cell {
  font-weight: 700;
  text-align: right;
}

.empty {
  padding: 16px;
  text-align: center;
  color: var(--muted);
}

.loading {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(2, 6, 23, 0.6);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  z-index: 1000;
}

.hidden {
  display: none !important;
}

.spinner {
  width: 38px;
  height: 38px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.icon-btn {
  background: #0b1220;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.08s ease;
}

.icon-btn:hover { background: #151c2c; }
.icon-btn:active { transform: translateY(1px); }
.icon-btn.danger { color: #fecaca; border-color: rgba(239,68,68,0.35); }
.icon-btn.danger:hover { background: #1b1315; }

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* soft inline loading */
.inline-loading {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin-left: 12px;
  color: var(--muted);
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Responsive ปรับ spacing เล็กน้อยบนมือถือ */
@media (max-width: 640px) {
  .app {
    padding: 12px 12px 72px 12px;
  }

  .app-header {
    font-size: 20px;
  }

  .drug-table thead th,
  .drug-table tbody td {
    padding: 10px 8px;
  }
}