/* ===== Variables ===== */
:root {
  --primary:     #3b82f6;
  --primary-50:  #eff6ff;
  --primary-100: #dbeafe;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --success:     #10b981;
  --success-50:  #ecfdf5;
  --danger:      #ef4444;
  --danger-50:   #fef2f2;
  --warning:     #f59e0b;
  --gray-50:  #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --bg:        #0f172a;
  --card:      #ffffff;
  --border:    rgba(59, 130, 246, 0.15);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.06);
  --shadow:    0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1);
  --r: 14px;
  --r-sm: 8px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans Thai', 'Sarabun', sans-serif;
  background: var(--bg);
  color: var(--gray-700);
  line-height: 1.6;
  font-size: 15px;
}

/* ===== Container ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===== Header ===== */
header {
  background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 60%, #1d4ed8 100%);
  padding: 18px 0;
  box-shadow: var(--shadow-md);
}

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

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

.logo-icon { font-size: 36px; }

.logo-text {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
}
.logo-text span { color: #93c5fd; }

.logo-sub {
  font-size: 13px;
  color: #bfdbfe;
}

.header-badge {
  background: #22c55e;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 9999px;
}

/* ===== Ad Slots ===== */
.ad-slot {
  background: var(--gray-100);
  border: 1.5px dashed var(--gray-300);
  border-radius: var(--r-sm);
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 12px;
  margin: 16px 0;
}

/* ===== Main ===== */
main { padding: 24px 0 40px; }

/* ===== Tabs ===== */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 9px 22px;
  border-radius: 9999px;
  border: 2px solid var(--border);
  background: var(--card);
  color: var(--gray-500);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  font-family: inherit;
}
.tab-btn:hover {
  border-color: var(--primary-500);
  color: var(--primary-600);
}
.tab-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}

/* ===== Cards ===== */
.card {
  background: var(--card);
  border-radius: var(--r);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 24px;
  animation: fadeUp .25s ease;
}

.card h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 20px;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Calculator Grid ===== */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}
@media (max-width: 800px) {
  .calc-grid { grid-template-columns: 1fr; }
}

/* ===== Tab Content ===== */
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ===== Form Elements ===== */
.form-group { margin-bottom: 14px; }

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 5px;
}

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

.input-wrap {
  display: flex;
  align-items: center;
  border: 2px solid var(--border);
  border-radius: var(--r-sm);
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
  overflow: hidden;
}
.input-wrap:focus-within {
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(59,130,246,.15);
}

.input-wrap input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  padding: 9px 12px;
  font-size: 15px;
  color: var(--gray-900);
  background: transparent;
  font-family: inherit;
}
.input-wrap input[type=number]::-webkit-inner-spin-button,
.input-wrap input[type=number]::-webkit-outer-spin-button {
  opacity: .5;
}

.prefix, .suffix {
  padding: 9px 10px;
  background: var(--gray-50);
  color: var(--gray-500);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.prefix { border-right: 1px solid var(--border); }
.suffix { border-left: 1px solid var(--border); }

select {
  width: 100%;
  padding: 9px 12px;
  border: 2px solid var(--border);
  border-radius: var(--r-sm);
  font-size: 14px;
  color: var(--gray-800);
  background: #fff;
  outline: none;
  cursor: pointer;
  font-family: inherit;
  appearance: auto;
}
select:focus { border-color: var(--primary-500); }

.hint {
  display: block;
  font-size: 11.5px;
  color: var(--gray-400);
  margin-top: 4px;
}

.info-box {
  padding: 9px 12px;
  background: var(--primary-50);
  border: 2px solid var(--primary-100);
  border-radius: var(--r-sm);
  font-size: 15px;
  font-weight: 700;
  color: var(--primary);
}

/* ===== Slider ===== */
.slider {
  width: 100%;
  margin-top: 6px;
  height: 6px;
  border-radius: 9999px;
  accent-color: var(--primary);
  cursor: pointer;
}

.range-marks {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--gray-400);
  margin-top: 4px;
}

/* ===== Step Box ===== */
.step-box {
  background: var(--primary-50);
  border: 1.5px solid var(--primary-100);
  border-radius: var(--r-sm);
  padding: 14px;
  margin-bottom: 14px;
}
.step-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

/* ===== Segmented Button ===== */
.btn-group {
  display: flex;
  border: 2px solid var(--border);
  border-radius: var(--r-sm);
  overflow: hidden;
  margin-bottom: 4px;
}
.seg-btn {
  flex: 1;
  padding: 8px;
  border: none;
  background: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-500);
  transition: all .15s;
  font-family: inherit;
}
.seg-btn + .seg-btn { border-left: 1px solid var(--border); }
.seg-btn.active {
  background: var(--primary);
  color: #fff;
}

/* ===== Extra Payment Section ===== */
.extra-section {
  border-top: 1.5px solid var(--border);
  padding-top: 14px;
  margin-top: 4px;
}

.label-optional {
  color: var(--gray-400);
  font-weight: 400;
  font-size: 12px;
}

/* ===== Calculate Button ===== */
.btn-calc {
  width: 100%;
  padding: 13px;
  background: linear-gradient(135deg, var(--primary-600) 0%, var(--primary) 100%);
  color: #fff;
  border: none;
  border-radius: var(--r-sm);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.3px;
  transition: all .2s;
  box-shadow: var(--shadow-md);
  font-family: inherit;
  margin-top: 4px;
}
.btn-calc:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn-calc:active { transform: translateY(0); }

/* ===== Results ===== */
.result-hero {
  background: linear-gradient(135deg, var(--primary-50), #fff);
  border: 2px solid var(--primary-100);
  border-radius: var(--r-sm);
  padding: 18px 20px;
  margin-bottom: 14px;
  text-align: center;
}
.result-hero-label {
  font-size: 13px;
  color: var(--primary-600);
  font-weight: 600;
  margin-bottom: 4px;
}
.result-hero-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -1px;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 12px;
}

.result-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 14px;
  background: var(--gray-50);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
}
.result-item.full-width { grid-column: 1 / -1; }
.result-item.danger-item { background: var(--danger-50); border-color: #fecaca; }

.ri-label { font-size: 11.5px; color: var(--gray-500); font-weight: 500; }
.ri-value { font-size: 16px; font-weight: 700; color: var(--gray-800); }
.ri-value.danger { color: var(--danger); }

/* ===== Savings Box ===== */
.savings-box {
  background: var(--success-50);
  border: 1.5px solid #a7f3d0;
  border-radius: var(--r-sm);
  padding: 14px;
  margin-bottom: 12px;
}
.savings-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 10px;
}
.savings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.savings-item { display: flex; flex-direction: column; gap: 2px; }
.si-label { font-size: 11.5px; color: var(--gray-600); }
.si-value { font-size: 15px; font-weight: 700; }
.si-value.success { color: var(--success); }

/* ===== Charts ===== */
.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}
@media (max-width: 480px) { .charts-row { grid-template-columns: 1fr; } }

.chart-wrap { text-align: center; }
.chart-wrap canvas { max-height: 180px; }
.chart-caption { font-size: 11.5px; color: var(--gray-500); margin-top: 6px; }

/* ===== Section Header ===== */
.section-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.section-header h2 { margin-bottom: 0; }
.section-note { font-size: 12px; color: var(--gray-500); padding-top: 4px; }

/* ===== Amort Controls ===== */
.amort-controls { display: flex; gap: 8px; flex-wrap: wrap; }

.btn-sm {
  padding: 7px 14px;
  border: 2px solid var(--border);
  border-radius: var(--r-sm);
  background: #fff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  color: var(--gray-600);
  transition: all .15s;
  font-family: inherit;
  white-space: nowrap;
}
.btn-sm:hover { border-color: var(--primary-500); color: var(--primary); }
.btn-export:hover { border-color: var(--success); color: var(--success); }

/* ===== Tables ===== */
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.data-table th {
  background: var(--primary);
  color: #fff;
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}
.data-table th.text-right { text-align: right; }

.data-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
}
.data-table td.text-right { text-align: right; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:nth-child(even) { background: var(--gray-50); }
.data-table tr:hover { background: var(--primary-50); }

/* Comparison table specifics */
.data-table .row-current { background: var(--primary-50); font-weight: 700; }
.data-table .row-current td:first-child::after {
  content: ' ← ปัจจุบัน';
  color: var(--primary);
  font-size: 11px;
}
.data-table .best { color: var(--success); font-weight: 700; }
.data-table .worst { color: var(--danger); }

/* Amort table specifics */
.amort-table td { font-variant-numeric: tabular-nums; }
.amort-table td.text-right { font-size: 13px; }
.amort-table .td-principal { color: var(--success); font-weight: 600; }
.amort-table .td-interest { color: var(--danger); }
.amort-table .td-month { color: var(--gray-500); font-weight: 600; text-align: center; }
.amort-table tr.year-end-row { background: #e0f2fe !important; }
.amort-table tr.year-end-row td { font-weight: 700; color: var(--primary-700); }

/* ===== Rates table ===== */
.rates-card h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-700);
  margin-bottom: 10px;
}
.rates-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 700px) { .rates-grid { grid-template-columns: 1fr; } }

.rates-table th { background: var(--gray-800); }
.rates-note {
  font-size: 11px;
  color: var(--gray-400);
  margin-top: 8px;
  font-style: italic;
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.page-btn {
  min-width: 34px;
  padding: 5px 10px;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: #fff;
  font-size: 13px;
  cursor: pointer;
  color: var(--gray-600);
  transition: all .12s;
  font-family: inherit;
  text-align: center;
}
.page-btn:hover { border-color: var(--primary-500); color: var(--primary); }
.page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.page-dots { padding: 5px 4px; color: var(--gray-400); font-size: 13px; }

/* ===== Footer ===== */
footer {
  background: var(--gray-900);
  color: var(--gray-500);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
}
.footer-note { font-size: 11px; margin-top: 4px; color: var(--gray-600); }

/* ===== Print ===== */
@media print {
  header, .tabs, .btn-calc, .ad-slot, footer,
  .amort-controls, .pagination, .btn-sm,
  #comparison-card, .charts-row { display: none !important; }
  .calc-grid { grid-template-columns: 1fr !important; }
  .card { box-shadow: none; border: 1px solid #ccc; break-inside: avoid; }
  .data-table tr { break-inside: avoid; }
}