:root {
  --canvas: #08110e;
  --paper: #10201a;
  --paper-elevated: #162c24;
  --ink: #f2fbf6;
  --muted: #9ca3af;
  --line: #1e3d32;
  --line-light: #2b5748;
  --accent: #10b981;
  --accent-light: #34d399;
  --accent-dark: #065f46;
  --accent-ink: #042418;
  --warning: #f59e0b;
  --warning-light: #fbbf24;
  --danger: #ef4444;
  --success: #10b981;
  --radius: 1.25rem;
  --radius-sm: 0.75rem;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

body {
  background: radial-gradient(circle at 85% -10%, rgba(16, 185, 129, 0.18), transparent 40rem), var(--canvas);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  margin: 0;
  padding: 0;
}

main {
  max-width: 78rem;
  margin: 0 auto;
  padding: clamp(1.5rem, 4vw, 4rem) 1.25rem;
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: end;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2.5rem;
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(3rem, 7vw, 6rem);
  font-weight: 900;
  line-height: 0.9;
  text-transform: uppercase;
  margin: 0.5rem 0 0 0;
}

.hero h1 em {
  color: var(--accent);
  font-style: normal;
}

.hero-aside {
  max-width: 28rem;
  justify-self: end;
}

.hero-aside p {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0 0 1rem 0;
}

.demo-stamp {
  display: inline-flex;
  border: 1px solid var(--accent);
  border-radius: 99rem;
  padding: 0.4rem 0.85rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

/* Navigation Tabs Bar */
.tool-tabs-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding-bottom: 0.5rem;
}

.tab-btn {
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1.25rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.2s ease;
  touch-action: manipulation;
}

.tab-btn:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
}

.tab-icon {
  font-size: 1.2rem;
}

/* Calculation Panels */
.calc-panel {
  display: none;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 2.5rem);
  box-shadow: var(--shadow);
  margin-bottom: 3rem;
}

.calc-panel.active {
  display: block;
}

.panel-header {
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1rem;
}

.panel-header h2 {
  font-size: 1.6rem;
  margin: 0 0 0.5rem 0;
  font-weight: 800;
  color: var(--ink);
}

.panel-header p {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

/* Filter / Preset Chips */
.chips-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  padding-bottom: 0.4rem;
}

.chips-label {
  font-size: 0.8rem;
  font-weight: 750;
  color: var(--muted);
  text-transform: uppercase;
  margin-right: 0.25rem;
  flex-shrink: 0;
}

.filter-chip {
  background: var(--paper-elevated);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 99rem;
  padding: 0.5rem 1rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.15s ease;
  touch-action: manipulation;
}

.filter-chip:hover {
  border-color: var(--accent);
  color: var(--accent-light);
}

.filter-chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 800;
}

/* Forms & Inputs */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--muted);
}

.form-input,
.form-select {
  width: 100%;
  box-sizing: border-box;
  min-height: 44px;
  padding: 0.65rem 1rem;
  font-size: 16px; /* Prevents iOS auto-zoom */
  background: var(--canvas);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--ink);
  outline: none;
  transition: border-color 0.15s ease;
  touch-action: manipulation;
}

.form-input:focus,
.form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

.converter-inputs-grid,
.duty-inputs-grid,
.plot-inputs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

/* Results Cards Grid (Highlights) */
.results-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.highlight-card {
  background: var(--paper-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.highlight-card:hover {
  border-color: var(--line-light);
  transform: translateY(-2px);
}

.highlight-val {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--accent-light);
  line-height: 1.1;
  margin-bottom: 0.35rem;
}

.highlight-name {
  font-size: 0.95rem;
  font-weight: 750;
  color: var(--ink);
  margin-bottom: 0.2rem;
}

.highlight-telugu {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}

.highlight-desc {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.5rem;
  border-top: 1px dashed var(--line);
  padding-top: 0.5rem;
}

/* Data Table */
.table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: 1.5rem;
}

.table-container h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin: 0 0 1rem 0;
  color: var(--ink);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.data-table th {
  background: var(--paper-elevated);
  padding: 0.85rem 1rem;
  color: var(--muted);
  font-weight: 750;
  border-bottom: 1px solid var(--line);
}

.data-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
}

.data-table tr:hover td {
  background: rgba(16, 185, 129, 0.05);
}

.table-equiv-val {
  font-weight: 800;
  color: var(--accent-light);
}

/* Gender Selection Row */
.gender-selection-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

/* Duty Summary Card */
.duty-summary-card {
  background: var(--paper-elevated);
  border: 1px solid var(--line-light);
  border-radius: var(--radius-sm);
  padding: clamp(1.25rem, 3vw, 2rem);
  margin-top: 1.5rem;
}

.duty-summary-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.duty-total-block {
  display: flex;
  flex-direction: column;
}

.duty-total-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
}

.duty-total-inr {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  color: var(--accent-light);
  line-height: 1;
  margin: 0.25rem 0;
}

.duty-rate-badge {
  display: inline-flex;
  align-items: center;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--accent);
  color: var(--accent-light);
  font-size: 0.85rem;
  font-weight: 800;
  padding: 0.35rem 0.75rem;
  border-radius: 99rem;
}

.duty-breakdown-table {
  width: 100%;
  margin-bottom: 1.5rem;
  border-collapse: collapse;
}

.duty-breakdown-table td {
  padding: 0.75rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.95rem;
}

.duty-breakdown-table td:last-child {
  text-align: right;
  font-weight: 800;
  color: var(--ink);
}

.duty-notes-box {
  background: rgba(0, 0, 0, 0.25);
  border-left: 3px solid var(--accent);
  border-radius: 0 0.5rem 0.5rem 0;
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.45;
}

.duty-action-row {
  margin-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.duty-portal-link {
  color: var(--accent);
  font-weight: 800;
  font-size: 0.9rem;
  text-decoration: underline;
  text-underline-offset: 3px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  touch-action: manipulation;
}

/* Plot Results Overview */
.plot-results-card {
  background: var(--paper-elevated);
  border: 1px solid var(--line-light);
  border-radius: var(--radius-sm);
  padding: clamp(1.25rem, 3vw, 2rem);
}

.plot-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.plot-stat-item {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.plot-stat-label {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
}

.plot-stat-val {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--ink);
  margin-top: 0.25rem;
}

.plot-cost-highlight {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.plot-cost-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent-light);
}

/* Circle Rates & SRO Directory */
.circle-rates-results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.rate-card {
  background: var(--paper-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.rate-card:hover {
  border-color: var(--line-light);
  transform: translateY(-2px);
}

.rate-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.rate-locality-name {
  font-size: 1.15rem;
  font-weight: 850;
  color: var(--ink);
  margin: 0;
}

.rate-meta-row {
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

.rate-sro-badge {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: var(--accent-light);
  font-size: 0.75rem;
  font-weight: 750;
  padding: 0.2rem 0.55rem;
  border-radius: 99rem;
  white-space: nowrap;
}

.rate-numbers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 0.75rem;
}

.rate-stat {
  display: flex;
  flex-direction: column;
}

.rate-stat-lbl {
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 700;
  text-transform: uppercase;
}

.rate-stat-val {
  font-size: 1.15rem;
  font-weight: 850;
  color: var(--accent-light);
  margin-top: 0.15rem;
}

.rate-stat-range {
  font-size: 0.72rem;
  color: var(--ink);
  opacity: 0.85;
  margin-top: 0.15rem;
}

.rate-card-notes {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.4;
  border-top: 1px dashed var(--line);
  padding-top: 0.5rem;
}

.rate-actions-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.5rem;
}

.use-rate-btn {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 800;
  padding: 0.5rem 0.85rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  touch-action: manipulation;
  transition: opacity 0.15s ease;
}

.use-rate-btn:hover {
  opacity: 0.9;
}

.sro-portal-link {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 750;
  text-decoration: underline;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  touch-action: manipulation;
}

.sro-portal-guide-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid var(--line-light);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  margin-top: 2.5rem;
}

.sro-portal-guide-box h3 {
  font-size: 1.15rem;
  margin: 0 0 0.5rem 0;
  color: var(--warning-light);
}

.sro-portal-guide-box p {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0 0 1.25rem 0;
}

.sro-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: 1rem;
}

.sro-portal-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sro-portal-title {
  font-size: 0.95rem;
  font-weight: 750;
  color: var(--ink);
}

.sro-portal-desc {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.35;
}

.sro-portal-action {
  margin-top: auto;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  text-decoration: underline;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  touch-action: manipulation;
}

/* Method Note & Ad Slots */
.method-note {
  display: grid;
  grid-template-columns: 0.6fr 1fr auto;
  gap: 2rem;
  align-items: start;
  border-top: 1px solid var(--line);
  padding-block: 3rem;
}

.method-note div:last-child {
  display: grid;
  gap: 0.5rem;
}

.method-note a {
  color: var(--accent);
  font-weight: 800;
  text-decoration: underline;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  touch-action: manipulation;
}

/* Media Queries */
@media (max-width: 64rem) {
  .hero {
    grid-template-columns: 1fr;
  }
  .hero-aside {
    justify-self: start;
  }
  .method-note {
    grid-template-columns: 1fr 1fr;
  }
  .method-note > div:first-child {
    grid-column: 1 / -1;
  }
}

@media (max-width: 48rem) {
  main {
    padding-inline: 0.75rem;
  }
  .calc-panel {
    padding: 1.25rem 0.75rem;
  }
  .converter-inputs-grid,
  .duty-inputs-grid,
  .plot-inputs-grid,
  .results-cards-grid,
  .rates-stat-grid,
  .plot-output-summary,
  .faq-grid {
    grid-template-columns: 1fr;
  }
  .method-note {
    grid-template-columns: 1fr;
  }
  .duty-summary-header {
    flex-direction: column;
  }
}

@media (max-width: 32rem) {
  main {
    padding-inline: 0.5rem;
  }
  .calc-panel {
    padding: 1rem 0.5rem;
    min-width: 0;
  }
  .converter-card,
  .duty-summary,
  .calculator-workspace {
    padding: 0.75rem;
    min-width: 0;
  }
  .unit-pill-selector {
    gap: 0.35rem;
  }
  .unit-pill {
    padding: 0.4rem 0.65rem;
    font-size: 0.82rem;
  }
}