/* Variables */
:root {
  --color-primary: #2d6a4f;
  --color-primary-light: #40916c;
  --color-primary-dark: #1b4332;
  --color-background: #fafafa;
  --color-white: #ffffff;
  --color-text: #1a1a1a;
  --color-text-light: #666666;
  --color-border: #e5e5e5;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-lg: 16px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo-icon {
  font-size: 1.75rem;
}

.nav {
  display: flex;
  gap: 2rem;
}

.nav a {
  text-decoration: none;
  color: var(--color-text-light);
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: white;
  padding: 4rem 0;
  text-align: center;
}

.hero-content {
  max-width: 700px;
  margin: 0 auto;
}

.badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 1.25rem;
  opacity: 0.95;
  line-height: 1.6;
}

/* Section */
.section {
  padding: 4rem 0;
}

.section-alt {
  background: var(--color-white);
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section-header p {
  font-size: 1.125rem;
  color: var(--color-text-light);
}

/* Calculator */
.calculator-wrapper {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  align-items: start;
}

.calculator-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.calculator-card h2 {
  font-size: 1.875rem;
  margin-bottom: 0.5rem;
}

.calculator-intro {
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

/* Form */
.calc-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tooltip {
  position: relative;
  display: inline-flex;
  cursor: help;
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.tooltip-text {
  visibility: hidden;
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: white;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  white-space: nowrap;
  z-index: 10;
  opacity: 0;
  transition: opacity 0.2s;
}

.tooltip:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix {
  position: absolute;
  left: 1rem;
  color: var(--color-text-light);
  font-weight: 600;
}

.input-wrapper input {
  width: 100%;
  padding: 0.875rem 1rem 0.875rem 2.5rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: all 0.2s;
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(45, 106, 79, 0.1);
}

.form-helper {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* Buttons */
.btn-primary,
.btn-secondary {
  padding: 1rem 2rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: white;
}

/* Calculator Credit (visible in screenshots) */
.calculator-credit {
  text-align: center;
  font-size: 0.85rem;
  color: #666;
  margin-top: 1rem;
  margin-bottom: 1rem;
  padding: 0.5rem;
  font-weight: 500;
}

/* Results */
.results {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 2px solid var(--color-border);
}

.results.hidden {
  display: none;
}

.results h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.result-card {
  background: var(--color-background);
  padding: 1.5rem;
  border-radius: var(--radius);
  text-align: center;
}

.result-card.highlight {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: white;
}

.result-label {
  font-size: 0.875rem;
  opacity: 0.8;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.result-value {
  font-size: 1.75rem;
  font-weight: 700;
}

.result-value.large {
  font-size: 2.25rem;
}

.result-value.negative {
  color: var(--color-danger);
}

.result-details {
  background: #fef3c7;
  border-left: 4px solid var(--color-warning);
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
}

.result-details h4 {
  margin-bottom: 0.75rem;
}

.result-details ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.result-details li::before {
  content: "•";
  color: var(--color-warning);
  font-weight: 700;
  margin-right: 0.5rem;
}

/* Info Sidebar */
.info-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.info-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.info-card h3 {
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.info-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.info-card li {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-light);
}

/* Decision Tool */
.decision-tool {
  max-width: 800px;
  margin: 0 auto;
}

.question-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.question-card h4 {
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
}

.radio-label:hover {
  border-color: var(--color-primary-light);
  background: rgba(45, 106, 79, 0.05);
}

.radio-label input[type="radio"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.radio-label input[type="radio"]:checked + span {
  font-weight: 600;
  color: var(--color-primary);
}

.decision-result {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-top: 2rem;
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-primary);
}

.decision-result.hidden {
  display: none;
}

.decision-result h3 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.decision-result .advice-tag {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-weight: 600;
  margin-bottom: 1rem;
}

.decision-result .advice-tag.green {
  background: #dcfce7;
  color: #166534;
}

.decision-result .advice-tag.yellow {
  background: #fef3c7;
  color: #92400e;
}

.decision-result .advice-tag.red {
  background: #fee2e2;
  color: #991b1b;
}

.decision-result ul {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.decision-result li {
  margin-bottom: 0.5rem;
}

/* Guide */
.guide-content h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.guide-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.guide-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.guide-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.guide-card ul {
  margin-top: 1rem;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.guide-card li::before {
  content: "✓";
  color: var(--color-success);
  font-weight: 700;
  margin-right: 0.5rem;
}

.guide-example {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: white;
  padding: 2.5rem;
  border-radius: var(--radius-lg);
}

.guide-example h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.guide-example ul {
  list-style: none;
  margin-top: 1rem;
}

.guide-example li {
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.guide-example li:last-child {
  border-bottom: none;
}

/* FAQ */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-background);
  padding: 2rem;
  border-radius: var(--radius);
}

.faq-item h4 {
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

/* Footer */
.footer {
  background: var(--color-text);
  color: white;
  padding: 3rem 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-brand p {
  margin-top: 1rem;
  opacity: 0.8;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-links h4 {
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.875rem;
  opacity: 0.7;
}

.disclaimer {
  margin-top: 0.5rem;
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .calculator-wrapper {
    grid-template-columns: 1fr;
  }

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

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

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

  .footer-content {
    grid-template-columns: 1fr;
  }

  .nav {
    gap: 1rem;
    font-size: 0.875rem;
  }
}