:root {
  --bg: #0f172a;
  --card-bg: #1e293b;
  --card-border: #334155;
  --text: #f8fafc;
  --muted: #94a3b8;
  --primary: #10b981;
  --primary-hover: #059669;
  --accent: #3b82f6;
}

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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

.topbar {
  background: rgba(30, 41, 59, 0.85);
  border-bottom: 1px solid var(--card-border);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.brand-icon {
  font-size: 1.65rem;
}

.brand strong {
  display: block;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--primary);
}

.tabs {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.tab-btn {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--card-border);
  padding: 0.5rem 0.9rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.tab-btn.active {
  background: var(--primary);
  color: #052e16;
  border-color: var(--primary);
  font-weight: 700;
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 2.5rem;
  flex: 1;
}

@media (max-width: 880px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

.calc-card,
.offer-card,
.share-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  padding: 1.75rem;
}

.tab-panel {
  display: none;
}

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

h1 {
  font-size: 1.5rem;
  margin-bottom: 0.4rem;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.field label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.field input {
  width: 100%;
  background: #0f172a;
  border: 1px solid var(--card-border);
  color: var(--text);
  padding: 0.65rem 0.8rem;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.field input:focus {
  outline: 2px solid var(--primary);
  border-color: transparent;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: #0f172a;
  border: 1px solid var(--card-border);
  border-radius: 0.75rem;
  padding: 1rem;
}

.stat-box.highlight {
  border-color: var(--accent);
}

.stat-box.success {
  border-color: var(--primary);
}

.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

.stat-value {
  font-size: 1.45rem;
  color: var(--text);
}

.stat-box.success .stat-value {
  color: var(--primary);
}

.bar-comparison {
  background: #0f172a;
  padding: 1rem;
  border-radius: 0.75rem;
  border: 1px solid var(--card-border);
}

.bar-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.progress-track {
  height: 12px;
  background: #1e293b;
  border-radius: 999px;
  display: flex;
  overflow: hidden;
}

.progress-aportado {
  background: var(--accent);
}

.progress-interes {
  background: var(--primary);
}

.affiliate-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.offer-card {
  background: linear-gradient(160deg, #1e293b 0%, #064e3b 100%);
  border-color: var(--primary);
}

.offer-badge {
  display: inline-block;
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.offer-card h2 {
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.offer-card p {
  font-size: 0.9rem;
  color: #cbd5e1;
  margin-bottom: 1.2rem;
}

.cta-button {
  display: block;
  text-align: center;
  background: var(--primary);
  color: #052e16;
  text-decoration: none;
  font-weight: 700;
  padding: 0.8rem 1rem;
  border-radius: 0.6rem;
  transition: background 0.15s ease;
  margin-bottom: 0.75rem;
}

.cta-button:hover {
  background: var(--primary-hover);
}

.disclaimer {
  display: block;
  font-size: 0.72rem;
  color: #94a3b8;
}

.share-card h3 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

.share-card p {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.85rem;
}

.share-btn {
  width: 100%;
  background: #0f172a;
  color: var(--text);
  border: 1px solid var(--card-border);
  padding: 0.65rem;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 600;
}

.share-btn:hover {
  border-color: var(--primary);
}

.copy-feedback {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--primary);
  text-align: center;
}

.footer {
  border-top: 1px solid var(--card-border);
  padding: 1.25rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
}