/* DATE CALCULATOR - Professional Design System */
/* Clean, trustworthy, and user-friendly */

:root {
  /* Primary - Refined blue for trust and professionalism */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;

  /* Secondary - Warm accent for CTAs */
  --accent: #f97316;
  --accent-dark: #ea580c;
  --accent-light: #fb923c;

  /* Success/Positive */
  --success: #10b981;
  --success-light: #d1fae5;

  /* Neutrals - Refined gray scale */
  --white: #ffffff;
  --gray-25: #fcfcfd;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --gray-950: #030712;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Inter', var(--font-sans);
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;

  /* Shadows - Refined, subtle depth */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.04);

  /* Focus ring */
  --ring-color: rgba(37, 99, 235, 0.5);
  --ring-offset: 2px;

  /* Borders */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-700);
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  color: var(--gray-900);
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: 0.75rem;
  font-weight: 800;
}

h2 {
  font-size: clamp(1.375rem, 3vw, 1.625rem);
  margin-top: 2rem;
  margin-bottom: 0.875rem;
  font-weight: 700;
}

h3 {
  font-size: 1.125rem;
  margin-top: 1.5rem;
  margin-bottom: 0.625rem;
  font-weight: 600;
  color: var(--gray-800);
}

p {
  margin-bottom: 1rem;
  color: var(--gray-600);
  line-height: 1.7;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
  font-weight: 500;
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

strong {
  font-weight: 600;
  color: var(--gray-800);
}

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

.content-narrow {
  max-width: 780px;
  margin-left: auto;
  margin-right: auto;
}

/* Main */
main {
  flex: 1;
  padding: 2.5rem 0 4rem;
}

/* ==================== HEADER ==================== */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.95);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--gray-900);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo:hover {
  color: var(--primary);
  text-decoration: none;
}

.logo-icon {
  width: 34px;
  height: 34px;
  color: var(--primary);
  background: var(--primary-50);
  padding: 6px;
  border-radius: var(--radius-md);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-desktop a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-600);
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-desktop a:hover {
  color: var(--gray-900);
  background: var(--gray-100);
  text-decoration: none;
}

.nav-desktop a.active {
  color: var(--primary);
  background: var(--primary-50);
}

/* Dropdown Navigation */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-600);
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  background: none;
  border: none;
  font-family: inherit;
}

.nav-dropdown-toggle:hover {
  color: var(--gray-900);
  background: var(--gray-100);
}

.nav-dropdown-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.nav-dropdown:hover .nav-dropdown-toggle svg {
  transform: rotate(180deg);
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 0.5rem;
  padding-top: 0.75rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-fast);
  z-index: 200;
}

.nav-dropdown-menu::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 0;
  right: 0;
  height: 10px;
}

.nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-menu a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  color: var(--gray-700);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-dropdown-menu a:hover {
  background: var(--primary-50);
  color: var(--primary);
  text-decoration: none;
}

.nav-dropdown-menu a svg {
  width: 18px;
  height: 18px;
  color: var(--gray-400);
  flex-shrink: 0;
}

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

.nav-dropdown-divider {
  height: 1px;
  background: var(--gray-200);
  margin: 0.375rem 0;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--gray-700);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--gray-100);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

.nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 0.75rem;
  box-shadow: var(--shadow-lg);
}

.nav-mobile.active {
  display: block;
}

.nav-mobile a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--gray-700);
  font-weight: 500;
  border-radius: var(--radius-md);
}

.nav-mobile a:hover {
  background: var(--gray-100);
  color: var(--gray-900);
  text-decoration: none;
}

.nav-mobile-section {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--gray-100);
}

.nav-mobile-section:last-child {
  border-bottom: none;
}

.nav-mobile-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 1rem;
  margin: 0;
}

.nav-mobile-group {
  display: flex;
  flex-direction: column;
}

.nav-mobile-group a {
  padding: 0.625rem 1rem;
  font-size: 0.9375rem;
}

@media (max-width: 768px) {
  .nav-desktop { display: none; }
  .nav-toggle { display: block; }
}

/* ==================== CALCULATOR CARD ==================== */
.calc-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin-bottom: 2rem;
  border: 1px solid var(--gray-200);
}

.calc-header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 1.5rem 1.75rem;
  color: var(--white);
}

.calc-header h1,
.calc-header h2 {
  color: var(--white);
  margin: 0 0 0.375rem 0;
  font-size: 1.375rem;
  font-weight: 700;
}

.calc-header p {
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 400;
}

.calc-body {
  padding: 1.75rem;
}

/* Form Elements */
.form-grid {
  display: grid;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.form-row-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 600px) {
  .form-row, .form-row-3 {
    grid-template-columns: 1fr;
  }
}

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

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--gray-500);
}

.form-input,
.form-select {
  width: 100%;
  height: 48px;
  padding: 0 1rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--gray-800);
  background: var(--white);
  border: 1.5px solid var(--gray-300);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  appearance: none;
}

.form-input:hover,
.form-select:hover {
  border-color: var(--gray-400);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--ring-color);
}

.form-input::placeholder {
  color: var(--gray-400);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 18px;
  padding-right: 2.5rem;
}

/* Toggle Switch */
.toggle-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--gray-300);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.toggle.active {
  background: var(--primary);
}

.toggle::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: var(--white);
  border-radius: 50%;
  transition: transform var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.toggle.active::after {
  transform: translateX(20px);
}

.toggle-label {
  font-size: 0.875rem;
  color: var(--gray-600);
}

/* Calculate Button */
.calc-btn {
  width: 100%;
  height: 52px;
  margin-top: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--white);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.calc-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.calc-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
}

.calc-btn:hover::before {
  opacity: 1;
}

.calc-btn:active {
  transform: translateY(0);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.calc-btn:focus {
  outline: none;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35), 0 0 0 3px var(--ring-color);
}

/* Quick Select Buttons */
.quick-select {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.quick-btn {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--gray-600);
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-btn:hover {
  background: var(--primary-50);
  border-color: var(--primary-200);
  color: var(--primary-dark);
}

.quick-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

/* ==================== RESULTS ==================== */
.results-section {
  display: none;
  margin-top: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--gray-200);
}

.results-section.visible {
  display: block;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Big Result Display */
.result-hero {
  text-align: center;
  padding: 2.5rem 2rem;
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-xl);
  margin-bottom: 1.5rem;
  border: 1px solid var(--primary-200);
}

.result-number {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 10vw, 4rem);
  font-weight: 800;
  line-height: 1;
  color: var(--primary-dark);
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

.result-label {
  font-size: 1.125rem;
  color: var(--gray-600);
  font-weight: 600;
}

.result-sublabel {
  font-size: 0.9375rem;
  color: var(--gray-500);
  margin-top: 0.625rem;
  font-weight: 500;
}

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.result-item {
  padding: 1rem;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  text-align: center;
  border: 1px solid var(--gray-100);
  transition: all var(--transition-fast);
}

.result-item:hover {
  background: var(--white);
  border-color: var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.result-item-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.result-item-label {
  font-size: 0.6875rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.375rem;
  font-weight: 600;
}

/* Live Countdown */
.countdown-live {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

.countdown-unit {
  text-align: center;
  padding: 0.875rem 1rem;
  background: var(--gray-900);
  border-radius: var(--radius-lg);
  min-width: 70px;
}

.countdown-unit-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
}

.countdown-unit-label {
  font-size: 0.625rem;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ==================== CONTENT SECTIONS ==================== */
.content-section {
  background: var(--white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: 2rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--gray-100);
}

.content-section h2 {
  margin-top: 0;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--primary-100);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.content-section h2::after {
  display: none;
}

/* Key Takeaways */
.key-takeaways {
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--white) 100%);
  border: 1px solid var(--primary-200);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.75rem;
}

.key-takeaways-title {
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.key-takeaways ul {
  margin: 0;
  padding-left: 1.25rem;
}

.key-takeaways li {
  margin-bottom: 0.5rem;
  color: var(--gray-700);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.key-takeaways li:last-child {
  margin-bottom: 0;
}

.key-takeaways li strong {
  color: var(--gray-900);
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9375rem;
}

.data-table th,
.data-table td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.data-table th {
  font-weight: 600;
  color: var(--gray-700);
  background: var(--gray-50);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: var(--gray-50);
}

.data-table td {
  color: var(--gray-600);
}

.data-table tfoot {
  background: var(--gray-50);
}

.data-table tfoot td {
  font-size: 0.875rem;
  color: var(--gray-700);
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--gray-300);
}

.faq-item.open {
  border-color: var(--primary-200);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  text-align: left;
  color: var(--gray-800);
  background: var(--gray-50);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.faq-question:hover {
  background: var(--gray-100);
}

.faq-item.open .faq-question {
  background: var(--primary-50);
  color: var(--primary-dark);
}

.faq-question svg {
  width: 18px;
  height: 18px;
  color: var(--gray-400);
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

.faq-item.open .faq-question svg {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  display: none;
  padding: 1rem 1.25rem 1.25rem;
  background: var(--white);
  font-size: 0.9375rem;
  color: var(--gray-600);
  line-height: 1.7;
}

.faq-item.open .faq-answer {
  display: block;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Related Links */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.related-card {
  display: block;
  padding: 1.25rem;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.related-card:hover {
  background: var(--white);
  border-color: var(--primary-200);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}

.related-card-title {
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 0.375rem;
  font-size: 0.9375rem;
}

.related-card:hover .related-card-title {
  color: var(--primary-dark);
}

.related-card-desc {
  font-size: 0.8125rem;
  color: var(--gray-500);
  margin: 0;
  line-height: 1.5;
}

/* ==================== FOOTER ==================== */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 3.5rem 0 2rem;
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 2.5rem;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

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

.footer-brand .logo {
  margin-bottom: 1rem;
  color: var(--white);
}

.footer-brand .logo:hover {
  color: var(--primary-light);
}

.footer-brand .logo-icon {
  background: var(--gray-800);
  color: var(--primary-light);
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-nav h4,
.footer-section h4 {
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.footer-nav ul,
.footer-section ul {
  list-style: none;
}

.footer-nav li,
.footer-section li {
  margin-bottom: 0.625rem;
}

.footer-nav a,
.footer-section a {
  font-size: 0.875rem;
  color: var(--gray-400);
  transition: color var(--transition-fast);
  font-weight: 400;
}

.footer-nav a:hover,
.footer-section a:hover {
  color: var(--white);
  text-decoration: none;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--gray-800);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--gray-500);
  margin-bottom: 0.375rem;
}

.footer-bottom p:last-child {
  margin-bottom: 0;
}

/* ==================== UTILITIES ==================== */
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--gray-500); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }

/* External Links */
.external-link {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-color: var(--primary-200);
  text-underline-offset: 2px;
}

.external-link:hover {
  text-decoration-color: var(--primary);
}

/* Breadcrumbs */
.breadcrumbs {
  font-size: 0.8125rem;
  color: var(--gray-500);
  margin-bottom: 1.25rem;
}

.breadcrumbs a {
  color: var(--gray-500);
  font-weight: 400;
}

.breadcrumbs a:hover {
  color: var(--primary);
  text-decoration: none;
}

.breadcrumbs span {
  margin: 0 0.5rem;
  color: var(--gray-400);
}

/* ==================== CALCULATOR TABS ==================== */
.calc-tabs {
  display: flex;
  border-bottom: 1px solid var(--gray-200);
  background: var(--gray-50);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.calc-tab {
  flex: 1;
  min-width: 0;
  padding: 1rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--gray-500);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.calc-tab:hover {
  color: var(--gray-700);
  background: var(--gray-100);
}

.calc-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: var(--white);
}

@media (max-width: 600px) {
  .calc-tabs {
    gap: 0;
  }
  .calc-tab {
    font-size: 0.8125rem;
    padding: 0.875rem 0.625rem;
  }
}

/* Calculator Panels */
.calc-panel {
  display: none;
}

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

/* Intro Text */
.intro-text {
  font-size: 1.0625rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 1.75rem;
  max-width: 800px;
}

/* Checkbox Label */
.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.875rem;
  color: var(--gray-600);
  cursor: pointer;
  padding: 0.375rem 0;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
  border-radius: 4px;
}

.checkbox-label span {
  user-select: none;
}

.checkbox-label:hover {
  color: var(--gray-700);
}

/* Business Days CTA */
.business-days-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--white) 100%);
  border: 2px solid var(--primary-200);
  border-radius: var(--radius-xl);
  color: var(--gray-700);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.business-days-cta:hover {
  background: var(--primary-100);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--primary-dark);
}

.business-days-cta strong {
  color: var(--primary-dark);
}

.business-days-cta-arrow {
  font-size: 1.5rem;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--primary);
  transition: transform var(--transition-fast);
}

.business-days-cta:hover .business-days-cta-arrow {
  transform: translateX(4px);
}

/* ==================== ENHANCED RESULTS ==================== */

/* Compound breakdown badge */
.result-breakdown {
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary-dark);
  background: var(--white);
  border: 1px solid var(--primary-200);
  border-radius: var(--radius-full);
  padding: 0.625rem 1.5rem;
  width: fit-content;
  margin: 0 auto 1.25rem;
  box-shadow: var(--shadow-sm);
}

.result-breakdown:empty {
  display: none;
}

/* Natural language summary */
.result-summary {
  background: var(--gray-50);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--gray-700);
}

.result-summary:empty {
  display: none;
}

.result-summary strong {
  color: var(--gray-900);
}

/* Chart container */
.result-charts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
  .result-charts {
    grid-template-columns: 1fr;
  }
}

.result-chart-block {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 1.125rem;
  border: 1px solid var(--gray-100);
}

.result-chart-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.875rem;
}

/* Stacked bar chart */
.stacked-bar {
  display: flex;
  height: 36px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background: var(--gray-200);
}

.stacked-bar-fill {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: width 0.6s ease;
  min-width: 0;
  overflow: hidden;
}

.stacked-bar-fill span {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--white);
  white-space: nowrap;
  padding: 0 0.5rem;
}

.stacked-bar-weekdays {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
}

.stacked-bar-weekends {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%);
}

.stacked-bar-legend {
  display: flex;
  gap: 1.25rem;
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: var(--gray-600);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-dot-weekdays {
  background: var(--primary);
}

.legend-dot-weekends {
  background: var(--accent);
}

/* Progress bar (year fraction) */
.progress-track {
  height: 36px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary-light), var(--primary-dark));
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
  min-width: 0;
}

.progress-caption {
  font-size: 0.8125rem;
  color: var(--gray-600);
  margin-top: 0.75rem;
  text-align: center;
}

.progress-caption strong {
  color: var(--gray-800);
}

/* Detail table wrapper */
.result-table-wrap {
  margin-top: 1.5rem;
}

.result-table-wrap .result-chart-title {
  margin-bottom: 0.625rem;
}

.result-detail-table {
  margin: 0;
}

.result-detail-table td:first-child {
  font-weight: 600;
  color: var(--gray-700);
  width: 40%;
}

/* Month-by-month mini bars */
.month-bar-cell {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  min-width: 80px;
}

.month-mini-bar {
  height: 14px;
  background: linear-gradient(90deg, var(--primary-light), var(--primary));
  border-radius: var(--radius-full);
  transition: width 0.4s ease;
  min-width: 4px;
}

/* Calendar grid visualization (month-separated) */
.result-viz-wrap {
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  border: 1px solid var(--gray-100);
}

.viz-scroll {
  overflow-x: auto;
  padding-bottom: 4px;
  -webkit-overflow-scrolling: touch;
}

.viz-months-row {
  display: flex;
  gap: 12px;
  width: fit-content;
}

.viz-month-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.viz-month-label {
  font-size: 0.5625rem;
  font-weight: 700;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  white-space: nowrap;
  line-height: 1;
}

.viz-month-grid {
  display: grid;
  grid-template-rows: repeat(7, 10px);
  grid-auto-flow: column;
  grid-auto-columns: 10px;
  gap: 3px;
}

.viz-day {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  opacity: 0;
  transform: scale(0.3);
  animation: vizPop 0.3s ease forwards;
  cursor: default;
}

.viz-day.wd {
  background: var(--primary);
}

.viz-day.we {
  background: var(--accent);
}

.viz-day.viz-empty {
  background: transparent;
  animation: none;
  opacity: 1;
}

.viz-day.wd:hover {
  background: var(--primary-dark);
  transform: scale(1.4);
}

.viz-day.we:hover {
  background: var(--accent-dark);
  transform: scale(1.4);
}

@keyframes vizPop {
  0% { opacity: 0; transform: scale(0.3); }
  60% { opacity: 1; transform: scale(1.15); }
  100% { opacity: 1; transform: scale(1); }
}

.viz-legend {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.875rem;
  font-size: 0.75rem;
  color: var(--gray-500);
}

.viz-day-count {
  margin-left: auto;
  font-weight: 600;
  color: var(--gray-600);
}

/* Compact cells for ranges > 180 days */
.viz-months-row.viz-compact .viz-month-grid {
  grid-template-rows: repeat(7, 7px);
  grid-auto-columns: 7px;
  gap: 2px;
}

.viz-months-row.viz-compact .viz-day {
  width: 7px;
  height: 7px;
  border-radius: 1.5px;
}

.viz-months-row.viz-compact {
  gap: 8px;
}

/* Count-up animation on hero */
.result-number.counting {
  transition: color 0.1s;
}

.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 -0.5rem;
  padding: 0 0.5rem;
}

/* ==================== LISTS ==================== */
ol, ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.5rem;
  color: var(--gray-600);
}

ol li {
  padding-left: 0.25rem;
}

/* ==================== FOCUS STATES FOR ACCESSIBILITY ==================== */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ==================== ENHANCED COUNTDOWN RESULTS ==================== */

/* Progress Ring Container */
.progress-ring-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem;
  background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
  border-radius: var(--radius-xl);
  margin-bottom: 1.5rem;
  border: 1px solid var(--primary-200);
}

.hero-days-display {
  text-align: center;
  margin-bottom: 1rem;
}

.days-count {
  font-family: var(--font-display);
  font-size: 4.5rem;
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1;
  letter-spacing: -0.03em;
}

.days-label {
  font-size: 1.1rem;
  color: var(--gray-600);
  font-weight: 600;
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.progress-ring-date {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-800);
}

.progress-ring-day {
  font-size: 0.9375rem;
  color: var(--gray-500);
  margin-top: 0.25rem;
}

/* Contextual Message */
.result-context-message {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--primary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--gray-700);
}

.result-context-message strong {
  color: var(--gray-900);
}

.result-context-emoji {
  font-size: 1.25rem;
  margin-right: 0.5rem;
}

/* Personalized Profile Card */
.birthday-profile-card {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
  .birthday-profile-card {
    grid-template-columns: 1fr;
  }
}

.profile-item {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  text-align: center;
  transition: all var(--transition-fast);
}

.profile-item:hover {
  border-color: var(--primary-200);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.profile-item-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  line-height: 1;
}

.profile-item-label {
  font-size: 0.6875rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.profile-item-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
}

.profile-item-detail {
  font-size: 0.8125rem;
  color: var(--gray-500);
  margin-top: 0.25rem;
}

/* Countdown Comparisons */
.countdown-comparisons {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.countdown-comparisons-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.comparison-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--gray-100);
}

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

.comparison-item:first-of-type {
  padding-top: 0;
}

.comparison-icon {
  font-size: 1.25rem;
  width: 2rem;
  text-align: center;
  flex-shrink: 0;
}

.comparison-info {
  flex: 1;
  min-width: 0;
}

.comparison-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-800);
}

.comparison-date {
  font-size: 0.75rem;
  color: var(--gray-500);
}

.comparison-bar-wrap {
  flex: 2;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.comparison-bar {
  flex: 1;
  height: 8px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.comparison-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.6s ease;
}

.comparison-bar-fill.birthday {
  background: linear-gradient(90deg, var(--primary-light), var(--primary-dark));
}

.comparison-bar-fill.christmas {
  background: linear-gradient(90deg, #22c55e, #16a34a);
}

.comparison-bar-fill.newyear {
  background: linear-gradient(90deg, #eab308, #ca8a04);
}

.comparison-bar-fill.halloween {
  background: linear-gradient(90deg, var(--accent-light), var(--accent-dark));
}

.comparison-bar-fill.valentines {
  background: linear-gradient(90deg, #f472b6, #ec4899);
}

.comparison-days {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--gray-700);
  min-width: 60px;
  text-align: right;
}

.comparison-days.highlight {
  color: var(--primary-dark);
}

/* Age Milestones Section */
.age-milestones {
  background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.age-milestones-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--gray-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.milestone-timeline {
  position: relative;
  padding-left: 2rem;
}

.milestone-timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gray-200);
}

.milestone-item {
  position: relative;
  padding-bottom: 1rem;
}

.milestone-item:last-child {
  padding-bottom: 0;
}

.milestone-item::before {
  content: '';
  position: absolute;
  left: -1.5rem;
  top: 4px;
  width: 12px;
  height: 12px;
  background: var(--white);
  border: 2px solid var(--gray-300);
  border-radius: 50%;
}

.milestone-item.current::before {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-100);
}

.milestone-item.past::before {
  background: var(--gray-400);
  border-color: var(--gray-400);
}

.milestone-item.next::before {
  background: var(--success);
  border-color: var(--success);
  box-shadow: 0 0 0 4px var(--success-light);
}

.milestone-age {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-900);
}

.milestone-item.past .milestone-age {
  color: var(--gray-500);
}

.milestone-name {
  font-size: 0.875rem;
  color: var(--gray-600);
}

.milestone-item.past .milestone-name {
  color: var(--gray-400);
}

.milestone-years {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-top: 0.125rem;
}

.milestone-item.next .milestone-years {
  color: var(--success);
  font-weight: 600;
}

/* Quick Stats Cards */
.quick-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 700px) {
  .quick-stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

.quick-stat {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: 1rem;
  text-align: center;
}

.quick-stat-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
}

.quick-stat-label {
  font-size: 0.6875rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.25rem;
  font-weight: 600;
}

/* Fun Fact Callout */
.fun-fact-callout {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border: 1px solid #fcd34d;
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.fun-fact-icon {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.fun-fact-text {
  font-size: 0.9375rem;
  color: #92400e;
  line-height: 1.6;
}

.fun-fact-text strong {
  color: #78350f;
}

/* Related Actions Grid */
.related-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 1.5rem;
}

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

.related-action {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.related-action:hover {
  background: var(--white);
  border-color: var(--primary-200);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  text-decoration: none;
}

.related-action-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.related-action-text {
  flex: 1;
}

.related-action-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--gray-800);
  line-height: 1.3;
}

.related-action:hover .related-action-title {
  color: var(--primary-dark);
}

.related-action-desc {
  font-size: 0.8125rem;
  color: var(--gray-500);
  margin-top: 0.125rem;
}

.related-action-arrow {
  color: var(--gray-400);
  transition: transform var(--transition-fast);
}

.related-action:hover .related-action-arrow {
  color: var(--primary);
  transform: translateX(4px);
}

/* ==================== PRINT STYLES ==================== */
@media print {
  .header,
  .footer,
  .calc-btn,
  .nav-toggle {
    display: none;
  }

  body {
    background: white;
  }

  .calc-card,
  .content-section {
    box-shadow: none;
    border: 1px solid var(--gray-200);
  }
}