/* Clean modern design - Robinhood inspired */

:root {
  --bg-primary: #f2f2f2;
  --bg-secondary: #e8e8e8;
  --bg-card: #ffffff;
  --bg-elevated: #f7f7f7;
  --bg-input: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: rgba(0, 0, 0, 0.6);
  --text-muted: rgba(0, 0, 0, 0.4);
  --accent: #00e676;
  --accent-hover: #00c853;
  --accent-soft: rgba(0, 230, 118, 0.15);
  --accent-bright: #00e676;
  --success: #00a846;
  --danger: #dc2626;
  --radius: 8px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Navigation */
.nav {
  background: var(--bg-card);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}

.nav-links > li > a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 10px 16px;
  border-radius: 24px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s ease;
  display: inline-block;
}

.nav-links > li > a:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.nav-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 8px;
}

/* Nav Dropdowns */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-btn {
  color: var(--text-secondary);
  background: none;
  border: none;
  padding: 10px 16px;
  border-radius: 24px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}

.nav-dropdown-btn:hover,
.nav-dropdown:hover .nav-dropdown-btn {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.nav-dropdown-btn::after {
  content: ' ▾';
  font-size: 0.7em;
  opacity: 0.6;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  border: 1px solid rgba(0,0,0,0.08);
  min-width: 180px;
  padding: 8px 0;
  z-index: 200;
  list-style: none;
}

.nav-dropdown:hover .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 10px 16px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all 0.1s ease;
  border-radius: 0;
}

.nav-dropdown-menu a:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px 60px;
  max-width: 600px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  line-height: 1.1;
}

.hero p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Container */
.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.container-wide {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
  border: 1px solid rgba(0,0,0,0.06);
  max-width: 100%;
  overflow-x: auto;
}

.score-card {
  max-width: 100%;
  box-sizing: border-box;
}

.card-header {
  margin-bottom: 40px;
}

.card-icon {
  display: none;
}

.card-title {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* Calculator Grid */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: 16px;
}

.calc-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px;
  text-decoration: none;
  transition: all 0.2s ease;
  display: block;
}

.calc-card:hover {
  background: var(--bg-elevated);
  transform: translateY(-2px);
}

.calc-card-icon {
  display: none;
}

.calc-card h3 {
  color: var(--text-primary);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.calc-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 16px;
}

.calc-card-tag {
  display: inline-block;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Form Elements */
h2 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 20px;
  margin-top: 40px;
}

h2:first-of-type {
  margin-top: 0;
}

.input-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.input-group {
  margin-bottom: 16px;
}

.input-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.input-group input,
.input-group select,
.input-group textarea {
  width: 100%;
  padding: 16px;
  background: var(--bg-input);
  border: 1px solid rgba(0,0,0,0.12);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  font-weight: 500;
  transition: all 0.15s ease;
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.input-group input::placeholder {
  color: var(--text-muted);
}

.input-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
}

/* Toggle */
.toggle-group {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  cursor: pointer;
  user-select: none;
}

.toggle-group input[type="checkbox"] {
  width: 48px;
  height: 28px;
  appearance: none;
  background: rgba(0,0,0,0.15);
  border-radius: 14px;
  position: relative;
  cursor: pointer;
  transition: background 0.15s ease;
}

.toggle-group input[type="checkbox"]::after {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  background: white;
  border-radius: 50%;
  top: 3px;
  left: 3px;
  transition: transform 0.15s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle-group input[type="checkbox"]:checked {
  background: var(--accent);
}

.toggle-group input[type="checkbox"]:checked::after {
  transform: translateX(20px);
}

.toggle-group label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Advanced Panel */
.advanced-panel {
  display: none;
  padding: 24px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  margin-bottom: 24px;
}

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

.advanced-panel h3 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

/* Accordion sub-sections within advanced panel */
.accordion-section {
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: var(--bg-card);
}

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  user-select: none;
}

.accordion-header:hover {
  background: var(--bg-elevated);
}

.accordion-header::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--text-muted);
}

.accordion-section.open .accordion-header::after {
  content: '−';
}

.accordion-content {
  display: none;
  padding: 0 16px 16px;
}

.accordion-section.open .accordion-content {
  display: block;
}

.accordion-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 8px;
}

/* Buttons */
.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 32px;
}

.btn {
  padding: 16px 28px;
  border-radius: 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background: var(--accent);
  color: #000000;
}

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

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid rgba(0,0,0,0.1);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
}

/* Results */
.results {
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid rgba(0,0,0,0.08);
}

.results h2 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
  margin-top: 0;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(140px, 100%), 1fr));
  gap: 16px;
}

.result-item {
  background: var(--bg-elevated);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
}

.result-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.result-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Guide Article */
.guide {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  margin-top: 32px;
}

.guide h2 {
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  text-transform: none;
  letter-spacing: -0.01em;
  margin-bottom: 32px;
  margin-top: 0;
}

.guide h3 {
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  margin: 32px 0 12px;
}

.guide h3:first-of-type {
  margin-top: 0;
}

.guide p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.guide ul,
.guide ol {
  color: var(--text-secondary);
  margin: 0 0 16px 20px;
  line-height: 1.8;
}

.guide li {
  margin-bottom: 8px;
}

.guide strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Footer */
.footer {
  margin-top: 80px;
  background: var(--text-primary);
  color: rgba(255,255,255,0.7);
}

.footer-links {
  max-width: 1000px;
  margin: 0 auto;
  padding: 48px 24px 32px;
}

.footer-brand-section {
  display: flex;
  align-items: flex-start;
  gap: 48px;
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.footer-logo span {
  color: var(--accent);
}

.footer-desc {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
  max-width: 280px;
}

.footer-nav-columns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col li {
  margin-bottom: 10px;
}

.footer-col a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.15s ease;
}

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

.footer-bottom {
  text-align: center;
  padding: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.8125rem;
}

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

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

@media (max-width: 768px) {
  .footer-brand-section {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .footer-desc {
    max-width: 100%;
  }

  .footer-nav-columns {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .footer-nav-columns {
    grid-template-columns: 1fr;
  }
}

/* Toast */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: 16px 32px;
  border-radius: 24px;
  font-size: 0.9375rem;
  font-weight: 600;
  z-index: 1000;
  animation: slideUp 0.2s ease;
}

/* Save Modal */
.save-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.save-modal {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.save-modal h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

@keyframes slideUp {
  from { opacity: 0; transform: translate(-50%, 16px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-card);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid rgba(0,0,0,0.08);
    box-shadow: 0 4px 6px rgba(0,0,0,0.08);
    gap: 0;
  }

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

  .nav-menu-btn {
    display: block;
  }

  .nav-dropdown {
    width: 100%;
  }

  .nav-dropdown-btn {
    width: 100%;
    text-align: left;
    padding: 12px 16px;
    border-radius: 0;
  }

  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    background: var(--bg-elevated);
    border-radius: 0;
    padding: 0;
    display: none;
  }

  .nav-dropdown.active .nav-dropdown-menu {
    display: block;
  }

  .nav-dropdown-menu a {
    padding: 10px 16px 10px 32px;
  }

  .nav-links > li > a {
    display: block;
    padding: 12px 16px;
    border-radius: 0;
  }

  .hero {
    padding: 48px 24px 40px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .input-row {
    grid-template-columns: 1fr;
  }

  .results-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .card {
    padding: 24px;
  }

  .btn-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .results-grid {
    grid-template-columns: 1fr;
  }

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

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--text-primary);
  color: #fff;
  padding: 12px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  z-index: 1000;
  text-decoration: none;
}

.skip-link:focus {
  top: 16px;
}

/* Hero social proof */
.hero-social-proof {
  margin-top: 16px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Calculator search */
.calc-search-container {
  max-width: 400px;
  margin: 0 auto 32px;
}

.calc-search {
  width: 100%;
  padding: 14px 20px;
  font-size: 1rem;
  border: 1px solid rgba(0,0,0,0.12);
  border-radius: 24px;
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: inherit;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.calc-search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.calc-search::placeholder {
  color: var(--text-muted);
}

/* Footer disclaimer */
.footer-disclaimer {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px 24px 0;
  text-align: center;
}

.footer-disclaimer p {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.6;
}