/* GCC Calculators — shared styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #fafbfc;
  --bg-card: #ffffff;
  --bg-muted: #f1f5f9;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --accent: #0d9488;
  --accent-hover: #0f766e;
  --accent-light: #ccfbf1;
  --accent-bg: #f0fdfa;
  --success: #059669;
  --warning: #d97706;
  --danger: #dc2626;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 4px 16px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 4px 24px rgba(15, 23, 42, 0.08);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --max-width: 1200px;
  --header-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; display: block; }

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), #0891b2);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.875rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
}

.nav-links a:hover { color: var(--text); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text);
}

/* ── Hero ── */
.hero {
  padding: 4rem 1.5rem 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
  max-width: 48rem;
}

.hero-lead {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 42rem;
  line-height: 1.7;
}

/* Jump nav */
.jump-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
}

.jump-nav a {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.15s;
}

.jump-nav a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
}

/* ── Sections ── */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
  margin-bottom: 0.75rem;
}

.section h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--text-muted);
  max-width: 36rem;
  margin-bottom: 2rem;
}

/* ── Tool Cards Grid ── */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s, border-color 0.2s;
}

.tool-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}

.tool-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.tool-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  flex: 1;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.tool-card .rule-set {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-bottom: 1rem;
  padding: 0.75rem;
  background: var(--bg-muted);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.tool-card .what-you-need {
  font-size: 0.8125rem;
  margin-bottom: 1.25rem;
}

.tool-card .what-you-need strong {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.tool-card .what-you-need ul {
  list-style: none;
  padding: 0;
}

.tool-card .what-you-need li {
  padding: 0.25rem 0 0.25rem 1rem;
  position: relative;
  color: var(--text-muted);
}

.tool-card .what-you-need li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.15s;
  text-decoration: none;
}

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

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

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-bg);
  color: var(--accent);
}

.btn-block { width: 100%; }

/* ── Info panels ── */
.info-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 2rem;
}

.info-panel h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.info-panel p, .info-panel li {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.info-card {
  padding: 1.25rem;
  background: var(--bg-muted);
  border-radius: var(--radius-sm);
}

.info-card h4 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.info-card p {
  font-size: 0.8125rem;
}

/* ── Calculator Page Layout ── */
.calc-hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 1.5rem;
}

.calc-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.calc-hero p {
  color: var(--text-muted);
  max-width: 42rem;
  line-height: 1.7;
}

.breadcrumb {
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 1rem;
}

.breadcrumb a { color: var(--text-muted); }

.calc-layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 900px) {
  .calc-layout { grid-template-columns: 1fr; }
}

/* ── Form Panel ── */
.calc-form-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.calc-form-panel h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.form-note {
  font-size: 0.8125rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--text);
}

.form-group .hint {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  font-family: var(--font);
  font-size: 0.9375rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.12);
}

.form-group textarea {
  min-height: 160px;
  resize: vertical;
  font-family: var(--mono);
  font-size: 0.8125rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 500px) {
  .form-row { grid-template-columns: 1fr; }
}

.form-divider {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 1.5rem 0;
}

.radio-group, .checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.radio-group label, .checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 400;
  font-size: 0.875rem;
  cursor: pointer;
}

.radio-group input, .checkbox-group input {
  width: auto;
  accent-color: var(--accent);
}

/* ── Results Panel ── */
.calc-results-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: calc(var(--header-h) + 1rem);
}

.calc-results-panel.empty {
  background: var(--bg-muted);
  border-style: dashed;
}

.result-placeholder {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-light);
  font-size: 0.9375rem;
}

.result-total {
  text-align: center;
  padding: 1.5rem;
  background: var(--accent-bg);
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
}

.result-total .label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.result-total .amount {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.result-total .currency {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Working table */
.working-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
  margin-top: 1rem;
}

.working-table th {
  text-align: left;
  font-weight: 600;
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-light);
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.working-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-muted);
}

.working-table td:last-child {
  text-align: right;
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--text);
  white-space: nowrap;
}

.working-table tr.total td {
  font-weight: 600;
  color: var(--text);
  border-bottom: none;
  padding-top: 0.75rem;
}

.working-table tr.subtotal td {
  font-weight: 500;
}

.result-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.summary-item {
  padding: 0.75rem;
  background: var(--bg-muted);
  border-radius: var(--radius-sm);
}

.summary-item .label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
}

.summary-item .value {
  font-size: 1rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  margin-top: 0.125rem;
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.alert-info {
  background: #eff6ff;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

.alert-warning {
  background: #fffbeb;
  color: #92400e;
  border: 1px solid #fde68a;
}

.alert-success {
  background: var(--accent-bg);
  color: #065f46;
  border: 1px solid #99f6e4;
}

/* ── Footer ── */
.site-footer {
  background: var(--bg-dark);
  color: #94a3b8;
  padding: 3rem 1.5rem 2rem;
  margin-top: 4rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (max-width: 700px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.7;
  margin-top: 0.75rem;
  max-width: 24rem;
}

.footer-col h4 {
  color: #e2e8f0;
  font-size: 0.8125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li { margin-bottom: 0.375rem; }

.footer-col a {
  color: #94a3b8;
  font-size: 0.8125rem;
}

.footer-col a:hover { color: #e2e8f0; }

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 1.5rem;
  font-size: 0.75rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  color: var(--success);
  background: rgba(5, 150, 105, 0.1);
  padding: 0.25rem 0.625rem;
  border-radius: 999px;
  margin-top: 0.5rem;
}

.privacy-badge::before {
  content: '🔒';
  font-size: 0.625rem;
}

/* ── Content sections below calculator ── */
.content-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.content-section h2 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.content-section p, .content-section li {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 0.75rem;
}

.content-section ol, .content-section ul {
  padding-left: 1.25rem;
  margin-bottom: 1rem;
}

/* ── Responsive nav ── */
@media (max-width: 768px) {
  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.75rem;
  }

  .nav-links.open { display: flex; }

  .tools-grid { grid-template-columns: 1fr; }

  .hero { padding: 2.5rem 1.5rem 2rem; }
}

/* ── File upload zone ── */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.upload-zone p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.upload-zone .icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

/* Validation results */
.validation-list {
  list-style: none;
  max-height: 400px;
  overflow-y: auto;
}

.validation-item {
  padding: 0.75rem;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.8125rem;
}

.validation-item.error {
  border-left: 3px solid var(--danger);
  background: #fef2f2;
}

.validation-item.warning {
  border-left: 3px solid var(--warning);
  background: #fffbeb;
}

.validation-item.success {
  border-left: 3px solid var(--success);
  background: var(--accent-bg);
}

.validation-item .line-num {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--text);
}

.validation-item .message {
  color: var(--text-muted);
  margin-top: 0.25rem;
}

html.embed .site-header,
html.embed .site-footer {
  display: none;
}
html.embed body {
  padding-top: 0;
}
html.embed .calc-hero,
html.embed .hero {
  padding-top: 1.5rem;
}