@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Thai:wght@400;500;600;700&family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: rgba(30, 41, 59, 0.8);
  --bg-card-hover: rgba(37, 51, 71, 0.9);
  --bg-input: #1e293b;
  --border: rgba(59, 130, 246, 0.15);
  --border-focus: rgba(96, 165, 250, 0.6);
  --accent: #3b82f6;
  --accent-dark: #60a5fa;
  --accent-2: #3b82f6;
  --accent-2-dark: #60a5fa;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-sm: 0 4px 16px rgba(0,0,0,0.25);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Noto Sans Thai', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Background ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% -10%, rgba(79,140,255,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 110%, rgba(240,199,94,0.08) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

/* ── Header ── */
header {
  text-align: center;
  padding: 48px 20px 32px;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(240,199,94,0.12);
  border: 1px solid rgba(240,199,94,0.25);
  border-radius: 100px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: 0.3px;
}

header h1 {
  font-family: 'Noto Sans Thai', 'Inter', sans-serif;
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  background: linear-gradient(135deg, #F0F2F5 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

header p {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto 24px;
  font-family: 'Noto Sans Thai', sans-serif;
}

.header-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  font-family: 'Noto Sans Thai', sans-serif;
}

/* ── Ad Slot ── */
.ad-slot {
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  margin: 16px 0;
}

.ad-slot-top { min-height: 90px; display: flex; align-items: center; justify-content: center; }
.ad-slot-mid { min-height: 250px; display: flex; align-items: center; justify-content: center; }

/* ── Tabs ── */
.tabs-wrapper {
  margin: 0 0 32px;
}

.tabs-nav {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
}

.tabs-nav::-webkit-scrollbar { display: none; }

.tab-btn {
  flex: 1;
  min-width: 120px;
  padding: 10px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Noto Sans Thai', 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.tab-btn:hover { background: var(--bg-card-hover); color: var(--text-primary); }

.tab-btn.active {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: #0F1729;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(240,199,94,0.3);
}

.tab-btn .tab-icon { font-size: 16px; }

/* ── Tab Panels ── */
.tab-panel { display: none; animation: fadeIn 0.3s ease; }
.tab-panel.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.card:hover { border-color: rgba(255,255,255,0.15); }

.card-title {
  font-family: 'Noto Sans Thai', sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-title .icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.icon-gold { background: rgba(240,199,94,0.15); }
.icon-blue { background: rgba(79,140,255,0.15); }
.icon-green { background: rgba(34,197,94,0.15); }
.icon-red { background: rgba(239,68,68,0.15); }
.icon-purple { background: rgba(167,139,250,0.15); }

/* ── Grid Layouts ── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }

@media (max-width: 640px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ── Form Elements ── */
.form-group { margin-bottom: 20px; }

.form-label {
  display: block;
  font-family: 'Noto Sans Thai', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  letter-spacing: 0.2px;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix, .input-suffix {
  position: absolute;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  pointer-events: none;
  z-index: 1;
}

.input-prefix { left: 14px; }
.input-suffix { right: 14px; }

.form-input, .form-select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: 'Inter', 'Noto Sans Thai', sans-serif;
  font-size: 16px;
  padding: 12px 14px;
  transition: var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--border-focus);
  background: rgba(255,255,255,0.09);
  box-shadow: 0 0 0 3px rgba(240,199,94,0.1);
}

.form-input.with-prefix { padding-left: 36px; }
.form-input.with-suffix { padding-right: 44px; }

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='%238B95A5' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
  cursor: pointer;
}

.form-select option { background: #1a2540; color: var(--text-primary); }

/* ── Toggle Switch ── */
.toggle-group {
  display: flex;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 20px;
}

.toggle-btn {
  flex: 1;
  padding: 11px 16px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: 'Noto Sans Thai', 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.toggle-btn.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #0F1729;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: 'Noto Sans Thai', 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.2px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #0F1729;
  box-shadow: 0 4px 16px rgba(240,199,94,0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(240,199,94,0.35);
}

.btn-secondary {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: rgba(255,255,255,0.12); }

.btn-success {
  background: linear-gradient(135deg, #22C55E, #16a34a);
  color: #fff;
  box-shadow: 0 4px 16px rgba(34,197,94,0.2);
}

.btn-success:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(34,197,94,0.3); }

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.2);
}

.btn-danger:hover { background: rgba(239,68,68,0.2); }

.btn-sm { padding: 8px 14px; font-size: 13px; }
.btn-icon { padding: 8px; border-radius: var(--radius-xs); }
.btn-full { width: 100%; }

/* ── Result Cards ── */
.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 24px;
}

@media (max-width: 640px) { .result-grid { grid-template-columns: 1fr; } }

.result-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  text-align: center;
  transition: var(--transition);
}

.result-card.highlight {
  background: rgba(240,199,94,0.08);
  border-color: rgba(240,199,94,0.25);
}

.result-card.success {
  background: var(--success-bg);
  border-color: rgba(34,197,94,0.2);
}

.result-card.danger {
  background: var(--danger-bg);
  border-color: rgba(239,68,68,0.2);
}

.result-label {
  font-family: 'Noto Sans Thai', sans-serif;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}

.result-value {
  font-size: 22px;
  font-weight: 700;
  font-family: 'Inter', sans-serif;
  transition: var(--transition);
}

.result-card.highlight .result-value { color: var(--accent); }
.result-card.success .result-value { color: var(--success); }
.result-card.danger .result-value { color: var(--danger); }
.result-card:not(.highlight):not(.success):not(.danger) .result-value { color: var(--text-primary); }

.result-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ── WHT Rate Description ── */
.wht-desc {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 8px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  font-family: 'Noto Sans Thai', sans-serif;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── PIT Tax Bracket Table ── */
.bracket-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 12px;
}

.bracket-table th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 8px 12px;
  text-align: left;
  font-weight: 600;
  font-family: 'Noto Sans Thai', sans-serif;
  border-bottom: 1px solid var(--border);
}

.bracket-table td {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-secondary);
  font-family: 'Noto Sans Thai', sans-serif;
}

.bracket-table tr.active-bracket td {
  color: var(--accent);
  font-weight: 600;
  background: rgba(240,199,94,0.05);
}

/* ── Bulk Calculator ── */
.bulk-table-wrap { overflow-x: auto; margin-bottom: 16px; }

.bulk-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
}

.bulk-table th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 10px 12px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  font-family: 'Noto Sans Thai', sans-serif;
}

.bulk-table td {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
}

.bulk-table .form-input, .bulk-table .form-select {
  padding: 8px 10px;
  font-size: 14px;
}

.bulk-total-row td {
  background: rgba(240,199,94,0.06);
  border-top: 2px solid rgba(240,199,94,0.2);
  font-weight: 700;
  color: var(--accent);
  font-family: 'Noto Sans Thai', sans-serif;
}

/* ── Summary / Export Panel ── */
.export-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.summary-table-wrap { overflow-x: auto; }

.summary-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 500px;
}

.summary-table th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  font-family: 'Noto Sans Thai', sans-serif;
}

.summary-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  font-size: 14px;
  color: var(--text-primary);
  font-family: 'Noto Sans Thai', sans-serif;
}

.summary-table tr:last-child td { border-bottom: none; }

.summary-table tr:hover td { background: var(--bg-card-hover); }

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
}

.badge-vat { background: rgba(79,140,255,0.15); color: var(--accent-2); }
.badge-wht { background: rgba(239,68,68,0.15); color: #f87171; }
.badge-pit { background: rgba(167,139,250,0.15); color: #c4b5fd; }
.badge-bulk { background: rgba(34,197,94,0.15); color: var(--success); }

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.5; }
.empty-state p { font-family: 'Noto Sans Thai', sans-serif; font-size: 15px; }

/* ── Divider ── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

/* ── Info Box ── */
.info-box {
  background: rgba(79,140,255,0.08);
  border: 1px solid rgba(79,140,255,0.2);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13px;
  color: #93c5fd;
  font-family: 'Noto Sans Thai', sans-serif;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 20px;
}

/* ── Effective Rate Bar ── */
.rate-bar-wrap {
  margin-top: 16px;
}

.rate-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-secondary);
  font-family: 'Noto Sans Thai', sans-serif;
  margin-bottom: 8px;
}

.rate-bar-track {
  height: 8px;
  background: var(--bg-input);
  border-radius: 100px;
  overflow: hidden;
}

.rate-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  border-radius: 100px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0%;
}

/* ── Number animation ── */
@keyframes countUp {
  from { opacity: 0.4; transform: scale(0.95); }
  to   { opacity: 1; transform: scale(1); }
}

.result-value.updating {
  animation: countUp 0.25s ease;
}

/* ── Tooltip ── */
[data-tooltip] { position: relative; cursor: help; }
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #1a2540;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 6px 10px;
  font-size: 12px;
  white-space: nowrap;
  color: var(--text-secondary);
  font-family: 'Noto Sans Thai', sans-serif;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 100;
}
[data-tooltip]:hover::after { opacity: 1; }

/* ── Footer ── */
footer {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
  margin-top: 48px;
  font-family: 'Noto Sans Thai', sans-serif;
}

footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* ── Responsive ── */
@media (max-width: 768px) {
  header { padding: 32px 16px 24px; }
  .card { padding: 20px; }
  .result-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .tab-btn { font-size: 12px; padding: 9px 10px; min-width: 90px; }
  .result-grid { grid-template-columns: 1fr; }
  .export-buttons { flex-direction: column; }
  .header-stats { gap: 20px; }
}

/* ── Print styles for PDF ── */
@media print {
  body { background: #fff; color: #000; }
  .tabs-nav, .export-buttons, .ad-slot, header .logo-badge, .btn { display: none !important; }
  .card { border: 1px solid #ddd; box-shadow: none; background: #fff; }
  .summary-table th { background: #f5f5f5; color: #333; }
  .summary-table td { color: #333; border-color: #eee; }
}