/* =========================================================================
   tools/vat/style.css — VAT calculator
   Theme: Palette B — steel blue (#5A8DA0)
   Mood: minimal, ทางการ, เครื่องคิดเลขภาษี neutral-blue
   ========================================================================= */

/* === Theme override (Palette B — --b-steel) === */
body {
  --blue:        #5A8DA0;   /* primary — steel blue */
  --blue-dark:   #4A7889;   /* hover / pressed */
  --primary-bg:  #EEF4F7;   /* callout / hover bg อ่อน */
  --primary-mid: #D4E3EA;   /* card lift bg */
  --primary-tint: rgba(90, 141, 160, 0.12);
  --primary-text: #2E5061;  /* badge / strong text */
  --accent-light: #9DBAC7;  /* border highlight */
}

/* === Container — edge-to-edge 1400 === */
body .container {
  max-width: 1400px;
  padding: 0;
}
body .site-header-inner {
  max-width: 1400px;
  padding: 0.85rem 1.5rem;
}

/* === Back link === */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin: 1.25rem 0 0 1.5rem;
  padding: 0.5rem 1rem;
  background: #fff;
  border-radius: 999px;
  box-shadow: var(--shadow-pill);
  transition: color 0.15s;
}
.back-link:hover { color: var(--blue); }

/* ============ Layout — 2 columns ============ */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  align-items: stretch;
  margin-top: 1.25rem;
  background: #FAFBFC;
}
.calc-form {
  padding: 2rem 2rem 3rem;
  min-width: 0;
}
.calc-result {
  padding: 2rem 2rem 3rem;
  min-width: 0;
}

.form-card,
.result-card {
  background: #fff;
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  padding: 1.75rem 1.85rem;
  box-shadow: 0 1px 3px rgba(15,23,42,0.04), 0 6px 18px rgba(15,23,42,0.04);
}

@media (max-width: 768px) {
  .calc-layout { grid-template-columns: 1fr; }
  .calc-form,
  .calc-result { padding: 1.25rem 1rem 1.5rem; }
  .calc-form { padding-bottom: 0.5rem; }
}
@media (max-width: 480px) {
  .form-card,
  .result-card { padding: 1.25rem 1.1rem; border-radius: 12px; }
}

/* ============ Form ============ */
.page-title {
  font-size: clamp(1.6rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 0.6rem;
  color: var(--text);
}
.page-subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 2rem;
}

/* Field — underline */
.field { margin-bottom: 2rem; }
.field-label {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.7rem;
  letter-spacing: -0.01em;
}
.field-input {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  border-bottom: 1.5px solid var(--border);
  padding-bottom: 0.45rem;
  transition: border-color 0.15s;
}
.field-input:focus-within { border-color: var(--blue); }
.field-input.field-input-error { border-bottom-color: #EF4444; }
.field-prefix {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--muted);
  line-height: 1;
}
.field-input input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 1.6rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text);
  padding: 0;
  width: 100%;
  letter-spacing: -0.01em;
  -moz-appearance: textfield;
}
.field-input input::-webkit-outer-spin-button,
.field-input input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.field-input input::placeholder { color: #CBD5E1; font-weight: 400; }

.error-msg {
  color: #DC2626;
  font-size: 0.85rem;
  margin-top: 0.55rem;
  font-weight: 500;
  display: none;
}
.error-msg.show { display: block; }

/* Segmented control */
.seg-control {
  display: flex;
  background: #F1F5F9;
  border-radius: 12px;
  padding: 4px;
  gap: 4px;
}
.seg-control input[type="radio"] {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.seg-control label {
  flex: 1;
  text-align: center;
  padding: 0.7rem 0.5rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  transition: background 0.18s, color 0.18s, box-shadow 0.18s;
  user-select: none;
  margin: 0;
}
.seg-control label:hover { color: var(--text-soft); }
.seg-control input:checked + label {
  background: #fff;
  color: var(--blue);
  font-weight: 600;
  box-shadow: 0 1px 3px rgba(15,23,42,0.08);
}

/* Primary button */
.btn {
  display: block;
  width: 100%;
  padding: 1rem;
  background: var(--blue);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  margin-top: 1.5rem;
  transition: background 0.15s, box-shadow 0.15s;
  box-shadow: 0 4px 14px rgba(34,196,133,0.30);
}
.btn:hover {
  background: var(--blue-dark);
  box-shadow: 0 6px 20px rgba(34,196,133,0.38);
}

/* ============ Result ============ */
.result-empty {
  text-align: center;
  padding: 3.5rem 1.5rem;
  color: var(--muted);
}
.result-empty .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.55;
}
.result-empty p { font-size: 0.95rem; }

.result-content { animation: fadeIn 0.3s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Summary cards */
.summary-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
  margin-bottom: 1rem;
}
@media (max-width: 540px) { .summary-cards { grid-template-columns: 1fr; } }
.summary-card {
  padding: 1.25rem 1.4rem;
  border-radius: 14px;
  border: 1px solid;
}
.summary-card-pay {
  background: linear-gradient(140deg, var(--primary-bg) 0%, var(--primary-mid) 100%);
  border-color: var(--accent-light);
}
.summary-card-vat {
  background: linear-gradient(140deg, #F8FAFC 0%, #EEF2F5 100%);
  border-color: #E2E8F0;
}
.summary-card-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-soft);
  margin-bottom: 0.45rem;
  letter-spacing: -0.005em;
}
.summary-card-value {
  font-size: clamp(1.7rem, 4.5vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-bottom: 0.35rem;
}
.summary-card-pay .summary-card-value { color: var(--primary-text); }
.summary-card-vat .summary-card-value { color: var(--text); }
.summary-card-note {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 500;
}
.summary-card-pay .summary-card-note { color: var(--primary-text); opacity: 0.7; }
.summary-card-vat .summary-card-note { color: var(--text-soft); opacity: 0.85; }

/* Breakdown */
.breakdown {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}
.break-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.75rem 0.25rem;
  font-size: 0.95rem;
  line-height: 1.5;
}
.break-row + .break-row { border-top: 1px dashed #E2E8F0; }
.break-label {
  color: var(--text-soft);
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.break-formula {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap;
}
.break-value {
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  text-align: right;
}
.break-add { color: var(--text-soft); font-weight: 500; }

.break-row-final {
  margin-top: 0.5rem;
  padding-top: 1.1rem !important;
  border-top: 2px solid var(--text) !important;
}
.break-row-final .break-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}
.break-final {
  font-size: 1.2rem;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.rate-badge {
  background: var(--primary-tint);
  color: var(--blue);
  padding: 0.12rem 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
}

/* Summary callout */
.summary-callout {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
  margin-top: 1.5rem;
  padding: 1.1rem 1.25rem;
  background: linear-gradient(180deg, var(--primary-bg) 0%, var(--primary-mid) 100%);
  border: 1px solid var(--accent-light);
  border-radius: 14px;
}
.summary-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  line-height: 1.4;
}
.summary-text {
  color: var(--primary-text);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}
.summary-text strong {
  font-weight: 700;
  color: var(--primary-text);
  white-space: nowrap;
}

/* Hint text under field-label */
.hint-text {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.5;
}

/* === Copy button === */
.result-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1rem;
}
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1rem;
  background: #fff;
  color: var(--text-soft);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s;
}
.copy-btn:hover {
  background: var(--primary-bg);
  color: var(--blue);
  border-color: var(--accent-light);
}
.copy-btn.copied {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.copy-btn svg { stroke: currentColor; }

/* === CTA card — แนะนำ WHT calculator === */
.cta-cert {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  max-width: 1400px;
  margin: 2rem auto 0;
  padding: 1.25rem 1.4rem;
  background: linear-gradient(135deg, var(--primary-bg) 0%, var(--primary-mid) 100%);
  border: 1.5px solid var(--accent-light);
  border-radius: 16px;
  text-decoration: none;
  color: var(--primary-text);
  position: relative;
  overflow: hidden;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.cta-cert:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
  box-shadow: 0 10px 28px rgba(90, 141, 160, 0.20);
}
.cta-cert::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(255,255,255,0.5) 0%, transparent 65%);
  pointer-events: none;
}
.cta-cert-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: #fff;
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(90, 141, 160, 0.25);
  position: relative;
  z-index: 1;
}
.cta-cert-icon svg { stroke: currentColor; }
.cta-cert-body { flex: 1; min-width: 0; position: relative; z-index: 1; }
.cta-cert-tag {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 0.35rem;
}
.cta-cert-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.3;
  margin-bottom: 0.25rem;
}
.cta-cert-subtitle {
  font-size: 0.85rem;
  color: var(--text-soft);
  line-height: 1.55;
}
.cta-cert-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--blue);
  color: #fff;
  padding: 0.78rem 1.25rem;
  border-radius: 11px;
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(90, 141, 160, 0.32);
  transition: background 0.15s, box-shadow 0.15s;
  position: relative;
  z-index: 1;
}
.cta-cert:hover .cta-cert-btn {
  background: var(--blue-dark);
  box-shadow: 0 6px 18px rgba(90, 141, 160, 0.42);
}
.cta-cert-btn svg { stroke: currentColor; transition: transform 0.18s; }
.cta-cert:hover .cta-cert-btn svg { transform: translateX(2px); }

@media (max-width: 540px) {
  .cta-cert {
    flex-direction: column;
    text-align: center;
    align-items: stretch;
    padding: 1.4rem 1.1rem;
    margin: 1.5rem 1rem 0;
  }
  .cta-cert-icon { margin: 0 auto; }
  .cta-cert-tag, .cta-cert-btn { align-self: center; justify-content: center; }
  .cta-cert-btn { width: 100%; }
}

/* ============ Info + FAQ — 2 columns ============ */
.info-grid {
  max-width: 1400px;
  margin: 4rem auto 5rem;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
@media (max-width: 768px) {
  .info-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
    padding: 0 1rem;
    margin: 3rem auto 4rem;
  }
}
.info-accordion { margin: 0; padding: 0; max-width: none; }
.info-accordion-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text);
  margin: 0 0 0.5rem;
}
.info-accordion-faq .faq-grid { display: block; }

/* Accordion — Google FAQ flat */
.info-acc {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--border-soft);
  border-radius: 0;
  margin: 0;
  padding: 0;
}
.info-acc:first-of-type { border-top: 1px solid var(--border-soft); }

.info-acc summary {
  padding: 1.25rem 0.25rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.25rem;
  user-select: none;
  transition: color 0.15s;
}
.info-acc summary::-webkit-details-marker { display: none; }
.info-acc summary::after {
  content: "";
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  margin-bottom: 4px;
  transition: transform 0.25s, border-color 0.15s;
  flex-shrink: 0;
  opacity: 0.7;
}
.info-acc[open] summary::after {
  transform: rotate(225deg);
  margin-bottom: -4px;
  border-color: var(--blue);
  opacity: 1;
}
.info-acc summary:hover { color: var(--text); }
.info-acc[open] summary { font-weight: 500; color: var(--text); }
.info-acc-body {
  padding: 0 0.25rem 1.4rem;
  color: var(--text-soft);
  font-size: 0.95rem;
  line-height: 1.85;
}
.info-acc-body p { margin-bottom: 0.8rem; }
.info-acc-body p:last-child { margin-bottom: 0; }
.info-acc-body strong { color: var(--text); font-weight: 600; }
.info-acc-body em { color: var(--text); font-style: normal; font-weight: 500; }

.rate-list {
  list-style: none; padding: 0; margin: 0;
  display: grid; gap: 0.5rem;
}
.rate-list li {
  display: flex; align-items: center; gap: 0.85rem;
  padding: 0.65rem 0.85rem;
  background: #F8FAFC;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-soft);
}
.rate-pct {
  flex-shrink: 0;
  min-width: 2.75rem;
  text-align: center;
  background: var(--primary-tint);
  color: var(--blue);
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}

.formula {
  background: #F8FAFC;
  border-radius: 10px;
  padding: 0.95rem 1.15rem;
}
.formula-row {
  padding: 0.45rem 0;
  font-size: 0.9rem;
  color: var(--text-soft);
  line-height: 1.7;
}
.formula-row + .formula-row { border-top: 1px dashed var(--border); }

/* ============ Responsive ============ */
@media (max-width: 880px) {
  body .container    { padding: 1rem 1rem 3rem; }
  .calc-layout       { gap: 2rem; }
  .field-input input { font-size: 1.4rem; }
  .field-prefix      { font-size: 1.3rem; }
}
@media (max-width: 480px) {
  .seg-control label { padding: 0.6rem 0.35rem; font-size: 0.8rem; }
  .field             { margin-bottom: 1.5rem; }
  .info-grid         { padding: 0 1rem; }
  .info-acc summary  { padding: 1.1rem 0.25rem; font-size: 0.95rem; }
}