/* ============================== */
/* GST CALCULATOR STYLES
/* ============================== */

/* Breadcrumb */
.breadcrumb {
  padding: 12px 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  transition: background var(--transition), border var(--transition);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb li:not(:last-child)::after {
  content: "›";
  margin-left: 8px;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.breadcrumb a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.breadcrumb [aria-current="page"] {
  color: var(--text-secondary);
  font-weight: 500;
}

/* GST Hero */
.gst-hero {
  padding: 40px 0 32px;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border var(--transition);
}

.gst-hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gst-hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 14px;
}

.gst-hero-badge {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.gst-hero-badge span:first-child {
  color: #16a34a;
  font-weight: 500;
}

/* GST Calculator Section */
.gst-calculator-section {
  padding: 40px 0 24px;
}

.gst-calculator-wrapper {
  max-width: 900px;
  margin: 0 auto;
}

.gst-calculator-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 24px;
  text-align: center;
  letter-spacing: -0.02em;
}

.gst-calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: background var(--transition), border var(--transition);
}

/* Calculator Form */
.gst-calculator-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.gst-form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.gst-form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.gst-form-group input,
.gst-form-group select {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg);
  color: var(--text);
  transition: border var(--transition), background var(--transition), color var(--transition);
  width: 100%;
  min-height: 48px;
}

.gst-form-group input:focus,
.gst-form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.gst-form-group input::placeholder {
  color: var(--text-muted);
}

/* Radio Group */
.gst-radio-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 2px;
}

.gst-radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: background var(--transition), border var(--transition), color var(--transition);
}

.gst-radio-label:hover {
  background: var(--bg-secondary);
}

.gst-radio-label input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
  min-height: auto;
}

.gst-radio-label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--text);
}

/* Form Actions */
.gst-form-actions {
  display: flex;
  gap: 12px;
  margin-top: 4px;
}

.gst-btn {
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform 0.15s, box-shadow 0.2s;
  min-height: 48px;
  font-family: inherit;
}

.gst-btn:hover {
  transform: translateY(-1px);
}

.gst-btn.primary {
  background: var(--accent);
  color: #fff;
  flex: 1;
}

.gst-btn.primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.gst-btn.secondary {
  background: var(--bg-secondary);
  color: var(--text);
  border: 1px solid var(--border);
  flex: 0.5;
}

.gst-btn.secondary:hover {
  background: var(--border);
}

/* Results */
.gst-results {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 24px;
  transition: background var(--transition);
}

.gst-results h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}

.gst-result-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  transition: border var(--transition);
}

.gst-result-item:last-of-type {
  border-bottom: none;
}

.gst-result-item.total-result {
  padding: 12px 0;
  border-bottom: 2px solid var(--accent);
  margin-bottom: 4px;
}

.gst-result-item.total-result .gst-result-label {
  font-weight: 700;
  font-size: 1.1rem;
}

.gst-result-item.total-result .gst-result-value {
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--accent);
}

.gst-result-label {
  color: var(--text-secondary);
}

.gst-result-value {
  font-weight: 600;
  color: var(--text);
}

.gst-result-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

.copy-btn {
  padding: 10px 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text);
  transition: background var(--transition), border var(--transition);
  font-family: inherit;
  min-height: 40px;
}

.copy-btn:hover {
  background: var(--border);
}

.gst-copy-feedback {
  font-size: 0.9rem;
  color: #16a34a;
  opacity: 0;
  transition: opacity 0.3s;
}

.gst-copy-feedback.show {
  opacity: 1;
}

/* Disclaimer */
.gst-disclaimer {
  margin-top: 20px;
  padding: 16px 20px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border-left: 3px solid #f59e0b;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  transition: background var(--transition);
}

.gst-disclaimer strong {
  color: var(--text);
}

/* ============================== */
/* GST FORMULA SECTION
/* ============================== */
.gst-formula-section {
  padding: 40px 0 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border var(--transition);
}

.gst-formula-section h2 {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 32px;
  letter-spacing: -0.02em;
}

.gst-formula-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 32px;
}

.gst-formula-card,
.gst-formula-cgst,
.gst-formula-igst {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  transition: background var(--transition), border var(--transition);
}

.gst-formula-card h3,
.gst-formula-cgst h3,
.gst-formula-igst h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.gst-formula-box {
  background: var(--bg-secondary);
  padding: 16px 20px;
  border-radius: var(--radius);
  margin-bottom: 12px;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  transition: background var(--transition);
}

.gst-formula-box p {
  margin: 4px 0;
  color: var(--text-secondary);
}

.gst-formula-example {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.gst-formula-example p {
  margin: 2px 0;
}

.gst-formula-example strong {
  color: var(--text);
}

.gst-formula-cgst,
.gst-formula-igst {
  margin-top: 16px;
}

.gst-formula-cgst p,
.gst-formula-igst p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
}

/* ============================== */
/* GST EXAMPLES
/* ============================== */
.gst-examples-section {
  padding: 40px 0;
}

.gst-examples-section h2 {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 32px;
  letter-spacing: -0.02em;
}

.gst-examples-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.gst-example-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: background var(--transition), border var(--transition);
}

.gst-example-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text);
}

.gst-example-table {
  width: 100%;
  font-size: 0.9rem;
  border-collapse: collapse;
}

.gst-example-table tr {
  border-bottom: 1px solid var(--border);
}

.gst-example-table tr:last-child {
  border-bottom: none;
}

.gst-example-table td {
  padding: 6px 4px;
  color: var(--text-secondary);
}

.gst-example-table td:last-child {
  text-align: right;
  font-weight: 500;
  color: var(--text);
}

.gst-example-table .gst-example-total td {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  padding-top: 8px;
  border-top: 2px solid var(--border);
}

/* ============================== */
/* GST SEO CONTENT
/* ============================== */
.gst-seo-content {
  padding: 40px 0 16px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border var(--transition);
}

.gst-seo-content h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.gst-seo-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 28px 0 12px;
}

.gst-seo-content p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.gst-seo-content ul,
.gst-seo-content ol {
  margin: 12px 0 20px 24px;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.gst-seo-content ul li,
.gst-seo-content ol li {
  margin-bottom: 6px;
}

.gst-seo-content strong {
  color: var(--text);
}

.gst-internal-links {
  margin-top: 28px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  font-size: 1.05rem;
  transition: background var(--transition), border var(--transition);
}

.gst-internal-links p {
  margin-bottom: 8px;
}

.gst-internal-links p:last-child {
  margin-bottom: 0;
}

.gst-internal-links a {
  color: var(--accent);
  font-weight: 600;
}

.gst-internal-links a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ============================== */
/* GST FAQ
/* ============================== */
.gst-faq {
  padding: 40px 0 48px;
}

.gst-faq h2 {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 28px;
  letter-spacing: -0.02em;
}

/* ============================== */
/* RESPONSIVE
/* ============================== */

@media (max-width: 820px) {
  .gst-calculator-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px;
  }

  .gst-formula-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .gst-examples-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

@media (max-width: 700px) {
  .gst-hero h1 {
    font-size: 2rem;
  }

  .gst-hero-subtitle {
    font-size: 1rem;
  }

  .gst-hero-badge {
    font-size: 0.8rem;
    gap: 4px;
  }

  .gst-calculator-title {
    font-size: 1.4rem;
  }

  .gst-calculator-grid {
    padding: 18px 16px;
    border-radius: var(--radius);
  }

  .gst-form-actions {
    flex-direction: column;
  }

  .gst-btn.secondary {
    flex: 1;
  }

  .gst-radio-group {
    flex-direction: column;
    gap: 8px;
  }

  .gst-radio-label {
    padding: 10px 14px;
  }

  .gst-results {
    padding: 18px 16px;
  }

  .gst-examples-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }

  .gst-formula-card,
  .gst-formula-cgst,
  .gst-formula-igst {
    padding: 18px 16px;
  }

  .gst-formula-box {
    padding: 12px 14px;
    font-size: 0.85rem;
    overflow-x: auto;
  }

  .gst-seo-content h2 {
    font-size: 1.4rem;
  }

  .gst-seo-content p,
  .gst-seo-content ul,
  .gst-seo-content ol {
    font-size: 0.98rem;
  }

  .gst-faq h2 {
    font-size: 1.4rem;
  }

  .gst-result-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .copy-btn {
    width: 100%;
    justify-content: center;
  }

  .gst-copy-feedback {
    text-align: center;
  }

  .breadcrumb {
    padding: 8px 0;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .gst-hero {
    padding: 32px 0 24px;
  }

  .gst-hero h1 {
    font-size: 1.7rem;
  }

  .gst-calculator-grid {
    padding: 14px 12px;
    border-radius: var(--radius);
  }

  .gst-form-group input,
  .gst-form-group select {
    padding: 10px 12px;
    font-size: 16px !important;
    min-height: 44px;
  }

  .gst-btn {
    padding: 10px 20px;
    font-size: 0.95rem;
    min-height: 44px;
  }

  .gst-results h3 {
    font-size: 1rem;
  }

  .gst-result-item {
    font-size: 0.85rem;
    padding: 6px 0;
  }

  .gst-result-item.total-result .gst-result-value {
    font-size: 1.1rem;
  }

  .gst-formula-section h2,
  .gst-examples-section h2,
  .gst-seo-content h2,
  .gst-faq h2 {
    font-size: 1.4rem;
  }

  .gst-example-card {
    padding: 16px;
  }

  .gst-example-table {
    font-size: 0.8rem;
  }

  .gst-disclaimer {
    padding: 12px 14px;
    font-size: 0.8rem;
  }

  .gst-internal-links {
    padding: 14px 16px;
    font-size: 0.95rem;
  }

  .breadcrumb ol {
    gap: 4px 8px;
    font-size: 0.75rem;
  }
}

/* Dark mode adjustments */
[data-theme="dark"] .gst-radio-label:has(input:checked) {
  background: #1a2740;
}

[data-theme="dark"] .gst-result-item.total-result {
  border-bottom-color: #3b82f6;
}

[data-theme="dark"] .gst-result-item.total-result .gst-result-value {
  color: #3b82f6;
}

[data-theme="dark"] .gst-disclaimer {
  border-left-color: #d97706;
}