@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,400..800&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --ink: #14130F;
  --surface: #1C1B16;
  --surface-elevated: #24221C;
  --hairline: rgba(242, 239, 230, 0.12);
  --hairline-hover: rgba(242, 239, 230, 0.25);
  --text: #F2EFE6;
  --muted: #9A968B;
  --accent-blue: #3b82f6;
  --accent-sky: #60a5fa;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --font-display: 'Bricolage Grotesque', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
}

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

body {
  background-color: var(--ink);
  color: var(--text);
  font-family: var(--font-display);
  line-height: 1.5;
  min-height: 100vh;
  padding: 24px 16px 64px;
  background-image:
    linear-gradient(var(--hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px);
  background-size: 32px 32px;
}

.container {
  max-width: 980px;
  margin: 0 auto;
}

/* Header */
header {
  margin-bottom: 24px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(59, 130, 246, 0.12);
  color: var(--accent-sky);
  border: 1px solid rgba(59, 130, 246, 0.3);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 9999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

h1 {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: 8px;
}

.subtitle {
  color: var(--muted);
  font-size: 1rem;
  max-width: 780px;
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--surface);
  border: 1px solid var(--hairline);
  color: var(--muted);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab-btn:hover {
  color: var(--text);
  border-color: var(--hairline-hover);
}

.tab-btn.active {
  background: var(--surface-elevated);
  color: var(--accent-sky);
  border-color: var(--accent-blue);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.15);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Layout */
.calculator-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 24px;
  margin-bottom: 32px;
}

@media (max-width: 860px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background-color: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 24px;
}

.results-card {
  background-color: var(--surface);
  border: 1px solid rgba(59, 130, 246, 0.35);
  border-radius: 14px;
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-hint {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-sky);
  background: rgba(59, 130, 246, 0.12);
  padding: 3px 8px;
  border-radius: 4px;
}

/* Form inputs */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

input[type="text"], select {
  background-color: var(--surface-elevated);
  border: 1px solid var(--hairline);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 12px 14px;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.15s ease;
}

input[type="text"]:focus, select:focus {
  border-color: var(--accent-blue);
}

/* Radio pills */
.radio-pill-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.radio-pill {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  border-radius: 8px;
  background: var(--surface-elevated);
  border: 1px solid var(--hairline);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.15s ease;
}

.radio-pill input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.radio-pill:has(input:checked) {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-sky);
}

/* Validation status box */
.validate-status-box {
  margin-top: 16px;
  background: var(--surface-elevated);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.validate-status-box.valid {
  border-color: var(--accent-green);
  background: rgba(16, 185, 129, 0.08);
}

.validate-status-box.invalid {
  border-color: var(--accent-red);
  background: rgba(239, 68, 68, 0.08);
}

.status-indicator-icon {
  font-size: 1.8rem;
}

.status-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 2px;
}

.status-desc {
  font-size: 0.82rem;
  color: var(--muted);
}

/* 3D Digital Credential Card */
.card-3d-wrapper {
  perspective: 1000px;
  margin-bottom: 20px;
}

.digital-card {
  position: relative;
  background: linear-gradient(135deg, #1b2838 0%, #101924 50%, #0d131a 100%);
  border: 1px solid rgba(96, 165, 250, 0.3);
  border-radius: 16px;
  padding: 22px 20px;
  color: #ffffff;
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.5), inset 0 1px 1px rgba(255, 255, 255, 0.2);
  transform-style: preserve-3d;
  transition: transform 0.12s ease-out, box-shadow 0.15s ease;
  overflow: hidden;
}

.card-glass-sheen {
  position: absolute;
  top: 0;
  left: -100%;
  width: 200%;
  height: 100%;
  background: linear-gradient(115deg, transparent 40%, rgba(255, 255, 255, 0.08) 50%, transparent 60%);
  pointer-events: none;
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.republic-seal {
  display: flex;
  align-items: center;
  gap: 10px;
}

.seal-flag {
  font-size: 1.4rem;
}

.seal-text strong {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: #f1f5f9;
}

.seal-text span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.04em;
  color: #94a3b8;
}

.card-chip {
  width: 38px;
  height: 30px;
  border-radius: 6px;
  background: linear-gradient(135deg, #fcd34d 0%, #d97706 100%);
  border: 1px solid #b45309;
  box-shadow: inset 0 0 4px rgba(0, 0, 0, 0.3);
}

.card-cuit-display {
  font-family: var(--font-mono);
  font-size: 1.9rem;
  font-weight: 700;
  color: #60a5fa;
  letter-spacing: 0.06em;
  text-align: center;
  margin: 14px 0 20px;
  text-shadow: 0 0 12px rgba(96, 165, 250, 0.4);
  font-variant-numeric: tabular-nums;
}

.card-details-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 12px;
}

.card-item {
  display: flex;
  flex-direction: column;
}

.item-label {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  color: #94a3b8;
  margin-bottom: 2px;
}

.item-value {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: #f1f5f9;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.verified-text {
  color: var(--accent-green) !important;
}

/* Copy Buttons */
.copy-actions-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 12px;
}

.btn-copy {
  background: var(--surface-elevated);
  border: 1px solid var(--hairline);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-copy:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--accent-blue);
  color: var(--accent-sky);
}

.copy-toast {
  display: none;
  background: var(--accent-green);
  color: #000000;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 6px;
  text-align: center;
  margin-bottom: 10px;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Print Button */
.btn-print {
  margin-top: auto;
  width: 100%;
  background: var(--surface-elevated);
  border: 1px solid var(--hairline);
  color: var(--text);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-print:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--accent-blue);
  color: var(--accent-sky);
}

/* Math section */
.section-card {
  background-color: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 24px;
}

.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-desc {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 18px;
}

.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th {
  text-align: left;
  padding: 10px 12px;
  background-color: var(--surface-elevated);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--hairline);
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.table-total-row td {
  background: var(--surface-elevated);
  font-weight: 700;
  border-top: 2px solid var(--hairline);
}

.table-result-row td {
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-sky);
  font-weight: 700;
}

/* Tips Grid */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.tip-card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 18px;
}

.tip-icon {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.tip-title {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 6px;
}

.tip-desc {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.45;
}

/* Related tools */
.related-tools-section {
  margin-bottom: 32px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 14px;
}

.related-card {
  background-color: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 16px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.15s ease;
  display: block;
}

.related-card:hover {
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.related-emoji {
  font-size: 1.5rem;
  margin-bottom: 6px;
}

.related-name {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.related-desc {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
}

/* FAQ */
.faq-section {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 32px;
}

.faq-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.faq-item {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
}

.faq-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.faq-q {
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.faq-a {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

/* Footer */
footer {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--hairline);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--accent-sky);
}

.footer-contact {
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-contact a {
  color: var(--accent-sky);
  text-decoration: none;
}

.footer-contact a:hover {
  text-decoration: underline;
}

/* Print Stylesheet */
@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
    padding: 0;
  }

  .tabs-nav, .card, .copy-actions-grid, .btn-print, footer, .related-tools-section, .badge {
    display: none !important;
  }

  .calculator-grid {
    display: block;
  }

  .results-card {
    background: #ffffff !important;
    border: 2px solid #000 !important;
  }

  .digital-card {
    background: #ffffff !important;
    color: #000000 !important;
    border: 2px solid #000000 !important;
    box-shadow: none !important;
  }

  .card-cuit-display {
    color: #000000 !important;
  }

  .item-value {
    color: #000000 !important;
  }
}