.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.75rem 1.5rem;
  border: 1.5px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--primary-dark); color: #fff; box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--bg); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--border-hover); box-shadow: var(--shadow); }
.btn-india { background: var(--india); color: #fff; box-shadow: var(--shadow); }
.btn-india:hover { background: #ea580c; color: #fff; box-shadow: var(--shadow-md); }

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  transition: box-shadow 0.18s ease, transform 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 700;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-hot { background: #fee2e2; color: var(--danger); }
.badge-high { background: #dcfce7; color: var(--success); }
.badge-med { background: #fef3c7; color: var(--warning); }
.badge-india { background: var(--india-light); color: var(--india); }

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.category-card {
  min-height: 180px;
  border-left: 5px solid var(--primary);
}

.category-card h3 { margin-bottom: 0.35rem; }
.category-card p { color: var(--text-secondary); font-size: 0.95rem; }
.category-card ul { margin-top: 0.75rem; }
.category-card a { font-weight: 600; }
.cat-maths { border-left-color: var(--cat-maths); }
.cat-finance { border-left-color: var(--cat-finance); }
.cat-unit { border-left-color: var(--cat-unit); }
.cat-health { border-left-color: var(--cat-health); }
.cat-datetime { border-left-color: var(--cat-datetime); }
.cat-science { border-left-color: var(--cat-science); }
.cat-india { border-left-color: var(--cat-india); }

.calculator-card {
  display: block;
  color: var(--text);
  min-height: 112px;
}

.calculator-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.calculator-card span {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.35rem;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 0.8rem;
  background: var(--bg);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1rem 1.15rem;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.faq-question::after { content: "+"; color: var(--primary); font-weight: 700; }
.faq-item.open .faq-question::after { content: "-"; }

.faq-answer {
  display: none;
  padding: 0 1.15rem 1rem;
  color: var(--text-secondary);
}

.faq-answer.open,
.faq-item.open .faq-answer { display: block; }

.footer-feedback-btn {
  display: block;
  padding: 0;
  margin: 0 0 0.45rem;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.45;
  text-align: left;
  cursor: pointer;
}

.footer-feedback-btn:hover,
.footer-feedback-btn:focus {
  color: var(--text);
  text-decoration: none;
  outline: none;
}

.feedback-modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: rgba(15, 23, 42, 0.58);
  backdrop-filter: blur(5px);
}

.feedback-modal-overlay.open {
  display: flex;
}

.feedback-modal {
  width: min(100%, 520px);
  max-height: min(92vh, 720px);
  overflow: auto;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.feedback-modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.25rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.feedback-modal-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
}

.feedback-modal-subtitle {
  margin: 0.25rem 0 0;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.55;
}

.feedback-modal-close {
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.35rem;
  line-height: 1;
}

.feedback-modal-close:hover,
.feedback-modal-close:focus {
  border-color: var(--primary);
  color: var(--primary);
  outline: none;
}

.feedback-form {
  padding: 1.25rem;
}

.feedback-form-row {
  margin-bottom: 1rem;
}

.feedback-form label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
  font-weight: 700;
}

.feedback-form input,
.feedback-form textarea {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  padding: 0.75rem 0.85rem;
  outline: none;
}

.feedback-form textarea {
  min-height: 9rem;
  resize: vertical;
}

.feedback-form input:focus,
.feedback-form textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.feedback-recipient {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.65rem;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary-dark);
  font-size: 0.85rem;
  font-weight: 700;
}

.feedback-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.feedback-secondary,
.feedback-submit {
  border: 0;
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.feedback-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.feedback-submit {
  background: var(--primary);
  color: #fff;
}

.feedback-submit:hover,
.feedback-submit:focus {
  background: var(--primary-dark);
  outline: none;
}

@media (max-width: 520px) {
  .feedback-actions {
    flex-direction: column-reverse;
  }

  .feedback-secondary,
  .feedback-submit {
    width: 100%;
  }
}

.reference-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: table;
}

.reference-table th,
.reference-table td {
  text-align: left;
  padding: 0.8rem;
  border-bottom: 1px solid var(--border);
}

.reference-table th {
  background: var(--bg-tertiary);
  font-weight: 700;
}

.reference-table tr:nth-child(even) td { background: var(--bg-secondary); }
.reference-table tr:last-child td { border-bottom: 0; }

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

.result-card {
  min-width: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  overflow: hidden;
}

.india-section {
  background: var(--india-light);
  border: 1px solid #fed7aa;
  border-radius: var(--radius-xl);
  padding: 2rem;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.link-grid a {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  font-weight: 600;
}

.link-grid a:hover {
  text-decoration: none;
  border-color: var(--india);
}

.company-page {
  max-width: 940px;
  padding-top: 2rem;
  padding-bottom: 4rem;
}

.company-hero {
  background: linear-gradient(135deg, var(--primary-light), var(--bg));
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  margin-bottom: 1.5rem;
}

.company-hero h1 {
  margin: 0.75rem 0;
}

.company-hero p {
  max-width: 760px;
  color: var(--text-secondary);
  font-size: 1.08rem;
}

.contact-actions {
  margin-top: 1.25rem;
}

.contact-actions .calc-btn {
  display: inline-flex;
  width: auto;
  min-width: 180px;
}

.popular-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.quick-access {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 1rem 0;
}

.quick-access a {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.55rem 0.9rem;
  color: var(--text-secondary);
  font-weight: 600;
  background: var(--bg);
}

.quick-access a:hover {
  border-color: var(--primary);
  color: var(--primary);
  text-decoration: none;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.hero {
  padding: 4rem 0 2rem;
  background: linear-gradient(180deg, var(--primary-light), var(--bg));
}

.hero h1 {
  font-size: clamp(2.3rem, 7vw, 4.6rem);
  letter-spacing: 0;
}

.hero-subtitle {
  max-width: 760px;
  color: var(--text-secondary);
  font-size: 1.15rem;
  margin-top: 1rem;
}

.hero-search {
  position: relative;
  max-width: 680px;
  margin-top: 1.5rem;
}

.hero-search .search-input {
  min-height: 58px;
  border-radius: var(--radius-xl);
  font-size: 1.05rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

.content-section {
  margin-top: 2rem;
}

.content-section h2 { margin-bottom: 0.75rem; }

.sidebar-card {
  margin-bottom: 1rem;
}

.sidebar-card ul {
  padding-left: 1.1rem;
}

@media (max-width: 1023px) {
  .category-grid,
  .popular-grid,
  .feature-grid,
  .link-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767px) {
  .category-grid,
  .popular-grid,
  .feature-grid,
  .link-grid,
  .result-grid { grid-template-columns: 1fr; }
  .india-section { padding: 1.25rem; }
  .reference-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}