:root {
  --primary-blue: #0052cc;
  --hero-gradient: linear-gradient(135deg, #0061ff 0%, #0033aa 100%);
  --bg-light: #f8fafc;
  --white: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius: 12px;
  --transition: all 0.3s ease;
  --success-bg: #ecfdf5;
  --success-text: #047857;
  --warning-bg: #fff7ed;
  --warning-text: #c2410c;
  --danger-bg: #fef2f2;
  --danger-text: #b91c1c;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", sans-serif;
  color: var(--text-main);
  background: var(--white);
  line-height: 1.7;
}

a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: 1200px;
  padding: 0 16px;
  margin: 0 auto;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.tz-hero {
  background: var(--hero-gradient);
  color: var(--white);
  padding: 34px 0 38px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 0.92rem;
}

.breadcrumb a,
.breadcrumb span {
  color: rgba(255, 255, 255, 0.92);
}

.tz-hero h1 {
  margin: 0;
  color: var(--white);
  font-size: clamp(2.2rem, 5vw, 3.55rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.main-area {
  padding: 42px 0 58px;
  background: var(--bg-light);
}

.converter-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 24px;
  align-items: start;
}

.converter-card {
  min-width: 0;
  padding: 28px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.result-card {
  position: sticky;
  top: 18px;
}

.card-heading {
  display: flex;
  gap: 16px;
  margin-bottom: 22px;
}

.card-heading h2 {
  margin: 0 0 6px;
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
  letter-spacing: -0.02em;
}

.card-heading p {
  margin: 0;
  color: var(--text-muted);
}

.card-icon {
  width: 56px;
  height: 56px;
  min-width: 56px;
  border-radius: 18px;
  background: rgba(0, 82, 204, 0.08);
  color: var(--primary-blue);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.mode-selector {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 0 0 22px;
  padding: 0;
  border: 0;
}

.mode-selector label {
  cursor: pointer;
}

.mode-selector input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.mode-selector span {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 10px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: var(--white);
  color: var(--text-main);
  font-size: 0.9rem;
  font-weight: 800;
  text-align: center;
  transition: var(--transition);
}

.mode-selector input:checked + span {
  color: var(--white);
  background: var(--primary-blue);
  border-color: var(--primary-blue);
}

.mode-selector input:focus + span,
.form-group input:focus,
.form-group select:focus,
.btn:focus,
details summary:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.16);
}

.form-grid,
.compare-zone-list {
  display: grid;
  gap: 18px;
}

.form-grid.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.compare-zone-list {
  margin-top: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.full-width {
  grid-column: 1 / -1;
}

.form-group {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-weight: 700;
}

.form-group input,
.form-group select {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--white);
  color: var(--text-main);
  font: inherit;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary-blue);
}

.note-box {
  margin-top: 20px;
  padding: 15px 17px;
  border-radius: 12px;
  border: 1px solid rgba(194, 65, 12, 0.16);
  background: var(--warning-bg);
  color: var(--warning-text);
}

.form-message {
  display: none;
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 10px;
  font-weight: 700;
}

.form-message.error {
  display: block;
  color: var(--danger-text);
  background: var(--danger-bg);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  color: var(--white);
  background: var(--primary-blue);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: #003f9e;
  transform: translateY(-1px);
}

.btn-secondary {
  color: var(--text-main);
  background: var(--white);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-light);
}

.results-placeholder {
  text-align: center;
  padding: 42px 18px;
}

.placeholder-icon {
  width: 92px;
  height: 92px;
  margin: 0 auto 18px;
  border-radius: 999px;
  background: rgba(0, 82, 204, 0.08);
  color: var(--primary-blue);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.results-placeholder p,
.summary-message {
  color: var(--text-muted);
}

.mini-label {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--primary-blue);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.main-result-card {
  padding: 22px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(0, 82, 204, 0.08), rgba(0, 82, 204, 0.03));
  border: 1px solid rgba(0, 82, 204, 0.16);
}

.main-result-card p {
  margin: 0 0 8px;
  color: var(--text-muted);
  font-weight: 700;
}

.main-result-card h2 {
  margin: 0 0 14px;
  color: var(--primary-blue);
  font-size: clamp(1.9rem, 4.5vw, 2.75rem);
  line-height: 1.08;
  overflow-wrap: anywhere;
}

.date-badge {
  display: inline-flex;
  align-items: center;
  padding: 7px 11px;
  border-radius: 999px;
  background: var(--success-bg);
  color: var(--success-text);
  font-size: 0.9rem;
  font-weight: 800;
}

.date-badge.warning {
  background: var(--warning-bg);
  color: var(--warning-text);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 20px 0;
}

.result-tile {
  min-width: 0;
  padding: 16px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--white);
}

.result-tile span {
  display: block;
  margin-bottom: 8px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.result-tile strong {
  display: block;
  font-size: 1.04rem;
  overflow-wrap: anywhere;
}

.insight-card {
  margin: 18px 0;
  padding: 17px 18px;
  border-radius: 12px;
  border: 1px solid rgba(4, 120, 87, 0.16);
  background: var(--success-bg);
  color: var(--success-text);
}

.insight-card.warning {
  border-color: rgba(194, 65, 12, 0.16);
  background: var(--warning-bg);
  color: var(--warning-text);
}

.insight-card.danger {
  border-color: rgba(185, 28, 28, 0.16);
  background: var(--danger-bg);
  color: var(--danger-text);
}

.insight-card p {
  margin: 6px 0 0;
}

.result-note {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--warning-bg);
  color: var(--warning-text);
  font-size: 0.95rem;
}

.comparison-block h3 {
  margin: 22px 0 10px;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.comparison-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  padding: 12px 14px;
  border: 1px solid var(--border-color);
  text-align: left;
  vertical-align: top;
}

.comparison-table th {
  background: #f1f5f9;
  font-weight: 800;
}

.content-section {
  margin-top: 30px;
  padding: 28px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.content-section h2 {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.content-section h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}

.content-section p {
  margin: 0 0 16px;
}

.split-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px;
}

.mistake-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0;
}

.mistake-grid > div {
  padding: 18px;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-light);
}

.faq-section details {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: var(--white);
  overflow: hidden;
}

.faq-section details + details {
  margin-top: 12px;
}

.faq-section summary {
  padding: 18px 20px;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.faq-section summary::-webkit-details-marker {
  display: none;
}

.faq-section details p {
  padding: 0 20px 20px;
  color: var(--text-muted);
}

.final-cta {
  margin-top: 30px;
  padding: 30px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(0, 82, 204, 0.08), rgba(0, 82, 204, 0.03));
  border: 1px solid rgba(0, 82, 204, 0.14);
}

.final-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(1.55rem, 3vw, 2.1rem);
}

.final-cta p {
  margin: 0;
}

.related-section {
  margin-top: 30px;
  padding: 26px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.related-section h2 {
  margin-bottom: 18px;
  font-size: 1.4rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.related-grid a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--bg-light);
  font-weight: 600;
  color: var(--primary-blue);
  transition: var(--transition);
}

.related-grid a:hover {
  background: #f1f5ff;
  border-color: rgba(0, 82, 204, 0.25);
  transform: translateY(-1px);
  text-decoration: none;
}

@media (max-width: 980px) {
  .converter-shell,
  .split-section {
    grid-template-columns: 1fr;
  }

  .result-card {
    position: static;
  }

  .mistake-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .related-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .main-area {
    padding: 28px 0 42px;
  }

  .converter-card,
  .content-section,
  .final-cta {
    padding: 20px;
  }

  .card-heading {
    flex-direction: column;
  }

  .mode-selector {
    grid-template-columns: 1fr;
  }

  .form-grid.two-col,
  .compare-zone-list,
  .result-grid,
  .mistake-grid {
    grid-template-columns: 1fr;
  }

  .button-row .btn {
    width: 100%;
  }

  .tz-hero {
    padding: 28px 0 32px;
  }
}

@media (max-width: 480px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}