/* ==========================================================================
   LopperX — US Financial Calculators Design System
   Global Stylesheet (style.css)
   ========================================================================== */

:root {
  /* Brand Palette - Deep Navy & Professional Emerald */
  --color-primary: #0b192c;
  --color-primary-light: #1e3e62;
  --color-primary-dark: #060d17;
  --color-accent: #00875a;
  --color-accent-hover: #006644;
  --color-accent-light: #e3fcef;
  --color-accent-border: #abf5d1;
  --color-secondary: #2563eb;
  --color-secondary-hover: #1d4ed8;

  /* Neutral Tones */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-hover: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-dark: #cbd5e1;
  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-text-light: #94a3b8;

  /* Status Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #0284c7;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Radii & Shadows */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;

  /* Layout */
  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1 0 auto;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-secondary-hover);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* --------------------------------------------------------------------------
   Header & Sticky Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

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

.logo-badge {
  font-size: 0.7rem;
  font-weight: 600;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-accent-border);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-left: 4px;
}

/* Nav Menu */
.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 24px;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  padding: 8px 4px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link svg {
  transition: transform var(--transition-fast);
}

.nav-item:hover .nav-link svg,
.nav-item:focus-within .nav-link svg {
  transform: rotate(180deg);
}

/* Calculators Dropdown (Mega Menu Style) */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: 760px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-col h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-accent-light);
}

.dropdown-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.dropdown-item a {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.dropdown-item a:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-primary);
  transform: translateX(3px);
}

/* Header CTAs & Mobile Toggle */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 135, 90, 0.25);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-border-dark);
}

.btn-outline:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.mobile-toggle {
  display: none;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  background-color: var(--color-surface-hover);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  background: linear-gradient(135deg, #0b192c 0%, #1e3e62 100%);
  color: #ffffff;
  padding: 80px 0 90px;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #abf5d1;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: #ffffff;
}

.hero-subtitle {
  font-size: 1.2rem;
  line-height: 1.6;
  color: #cbd5e1;
  margin-bottom: 36px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero .btn-primary {
  font-size: 1.05rem;
  padding: 14px 28px;
}

.hero .btn-outline {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.3);
  color: #ffffff;
  font-size: 1.05rem;
  padding: 14px 28px;
}

.hero .btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.18);
  border-color: #ffffff;
  color: #ffffff;
}

/* Animated Financial Elements in Hero */
.hero-bg-accent {
  position: absolute;
  pointer-events: none;
  opacity: 0.15;
  user-select: none;
}

.accent-dollar-1 {
  top: 15%;
  left: 8%;
  font-size: 4.5rem;
  font-weight: 800;
  animation: floatSlow 6s ease-in-out infinite alternate;
}

.accent-percent-1 {
  top: 25%;
  right: 10%;
  font-size: 4rem;
  font-weight: 800;
  animation: floatMedium 7s ease-in-out infinite alternate;
}

.accent-dollar-2 {
  bottom: 15%;
  right: 15%;
  font-size: 3.5rem;
  font-weight: 800;
  animation: floatSlow 8s ease-in-out infinite alternate-reverse;
}

.accent-graph-1 {
  bottom: 10%;
  left: 10%;
  width: 120px;
  height: 60px;
  animation: floatMedium 9s ease-in-out infinite alternate;
}

@keyframes floatSlow {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(-16px) rotate(4deg); }
}

@keyframes floatMedium {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(18px) rotate(-6deg); }
}

/* --------------------------------------------------------------------------
   Quick Search & Filter Bar
   -------------------------------------------------------------------------- */
.search-section {
  position: relative;
  z-index: 10;
  margin-top: -32px;
  margin-bottom: 40px;
}

.search-box-wrapper {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 14px 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 680px;
  margin: 0 auto;
}

.search-icon {
  color: var(--color-text-light);
  flex-shrink: 0;
}

.search-input {
  width: 100%;
  border: none;
  font-size: 1.05rem;
  color: var(--color-text);
  outline: none;
  background: transparent;
}

.search-input::placeholder {
  color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   Calculator Segmentation Cards (Homepage)
   -------------------------------------------------------------------------- */
.category-section {
  padding: 40px 0 60px;
}

.category-group {
  margin-bottom: 56px;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.category-header-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.category-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.calc-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
}

.calc-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-border);
}

.calc-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: #f1f5f9;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.calc-card:hover .calc-card-icon {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

.calc-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.calc-card-title a {
  color: inherit;
}

.calc-card-title a::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.calc-card-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  flex-grow: 1;
  line-height: 1.55;
}

.calc-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent);
}

.calc-card:hover .calc-card-cta {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Trust & Feature Badges
   -------------------------------------------------------------------------- */
.trust-section {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 60px 0;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.trust-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.trust-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.trust-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.trust-item p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   AdSense Placement Slots
   -------------------------------------------------------------------------- */
.ad-slot {
  width: 100%;
  max-width: var(--max-width);
  min-height: 90px;
  margin: 32px auto;
  background-color: #f8fafc;
  border: 1px dashed var(--color-border-dark);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px;
  position: relative;
  overflow: hidden;
}

.ad-slot::before {
  content: "Advertisement";
  margin-bottom: 4px;
  font-size: 0.75rem;
  color: var(--color-text-light);
}

/* --------------------------------------------------------------------------
   General Content & SEO Longform Styles
   -------------------------------------------------------------------------- */
.content-section {
  padding: 60px 0;
}

.prose {
  font-size: 1.05rem;
  color: #334155;
  line-height: 1.75;
}

.prose h2 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-top: 40px;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.prose h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-top: 28px;
  margin-bottom: 12px;
}

.prose p {
  margin-bottom: 18px;
}

.prose ul, .prose ol {
  margin-bottom: 20px;
  padding-left: 28px;
}

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

.prose strong {
  color: var(--color-primary);
}

.prose-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 32px;
}

/* FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 24px;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--color-accent-border);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-primary);
  cursor: pointer;
  user-select: none;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question svg {
  transition: transform var(--transition-fast);
  color: var(--color-accent);
  flex-shrink: 0;
}

.faq-item[open] .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--color-text-muted);
  font-size: 0.98rem;
  line-height: 1.65;
}

/* Formula Callout Box */
.formula-box {
  background: linear-gradient(135deg, #f8fafc 0%, #edf2f7 100%);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  margin: 24px 0;
}

.formula-expression {
  font-family: var(--font-family-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  word-break: break-word;
}

.formula-legend {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px;
}

/* --------------------------------------------------------------------------
   Global Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-primary);
  color: #94a3b8;
  padding-top: 64px;
  padding-bottom: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand .site-logo {
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: #94a3b8;
  margin-bottom: 20px;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #cbd5e1;
  font-size: 0.92rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}

.footer-links a:hover {
  color: #ffffff;
  transform: translateX(3px);
}

/* Social Icons with Recognizable Brand Colors */
.social-links {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.social-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.08);
  color: #cbd5e1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.social-btn:hover {
  transform: translateY(-2px);
  color: #ffffff;
}

.social-btn.facebook:hover {
  background-color: #1877f2; /* Facebook Blue */
}

.social-btn.instagram:hover {
  background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285aeb 90%); /* Instagram Gradient */
}

.social-btn.x-twitter:hover {
  background-color: #000000; /* X / Twitter Black */
}

.social-btn.linkedin:hover {
  background-color: #0a66c2; /* LinkedIn Blue */
}

.social-btn.youtube:hover {
  background-color: #ff0000; /* YouTube Red */
}

/* Footer Bottom */
.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-size: 0.85rem;
  color: #64748b;
}

.footer-legal-disclaimer {
  font-size: 0.85rem;
  color: #94a3b8;
  line-height: 1.6;
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}