/* CalcHub - Modern Calculator Hub Styles */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary: #10b981;
  --accent: #f59e0b;
  --dark: #1e293b;
  --gray-900: #0f172a;
  --gray-800: #1e293b;
  --gray-700: #334155;
  --gray-600: #475569;
  --gray-500: #64748b;
  --gray-400: #94a3b8;
  --gray-300: #cbd5e1;
  --gray-200: #e2e8f0;
  --gray-100: #f1f5f9;
  --gray-50: #f8fafc;
  --white: #ffffff;
  --success: #22c55e;
  --warning: #eab308;
  --error: #ef4444;
  --finance: #2563eb;
  --math: #8b5cf6;
  --health: #10b981;
  --time: #f59e0b;
  --shopping: #ec4899;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

/* Header */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--gray-900);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
}

/* Navigation */
.nav {
  display: flex;
  gap: 0.25rem;
}

.nav-dropdown {
  position: relative;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  background: transparent;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-700);
  cursor: pointer;
  transition: all 0.2s;
}

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

.nav-btn svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s;
}

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

.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-lg);
  padding: 0.5rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.2s;
}

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

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius);
  color: var(--gray-700);
  transition: all 0.15s;
}

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

.dropdown-item-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.dropdown-item-icon.finance { background: rgba(37, 99, 235, 0.1); color: var(--finance); }
.dropdown-item-icon.math { background: rgba(139, 92, 246, 0.1); color: var(--math); }
.dropdown-item-icon.health { background: rgba(16, 185, 129, 0.1); color: var(--health); }
.dropdown-item-icon.time { background: rgba(245, 158, 11, 0.1); color: var(--time); }
.dropdown-item-icon.shopping { background: rgba(236, 72, 153, 0.1); color: var(--shopping); }

/* Mobile menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-toggle { display: block; }
  
  .nav.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 1rem;
    box-shadow: var(--shadow-lg);
  }
  
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: 1rem;
  }
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0;
  font-size: 0.875rem;
}

.breadcrumbs ol {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumbs li::after {
  content: '›';
  color: var(--gray-400);
}

.breadcrumbs li:last-child::after {
  display: none;
}

.breadcrumbs a {
  color: var(--gray-600);
}

.breadcrumbs span {
  color: var(--gray-900);
  font-weight: 500;
}

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

.hero h1 {
  color: var(--white);
  margin-bottom: 1rem;
  font-size: 3rem;
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* Calculator Grid */
.calculators-section {
  padding: 4rem 0;
}

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

.section-header h2 {
  margin-bottom: 0.5rem;
}

.section-header p {
  color: var(--gray-600);
  font-size: 1.125rem;
}

.category-grid {
  margin-bottom: 3rem;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--gray-200);
}

.category-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
}

.category-icon.finance { background: rgba(37, 99, 235, 0.1); color: var(--finance); }
.category-icon.math { background: rgba(139, 92, 246, 0.1); color: var(--math); }
.category-icon.health { background: rgba(16, 185, 129, 0.1); color: var(--health); }
.category-icon.time { background: rgba(245, 158, 11, 0.1); color: var(--time); }
.category-icon.shopping { background: rgba(236, 72, 153, 0.1); color: var(--shopping); }

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.calc-card {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: all 0.3s;
}

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

.calc-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.calc-card h3 {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.calc-card p {
  color: var(--gray-600);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.calc-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-weight: 600;
  font-size: 0.875rem;
}

.calc-card-link svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s;
}

.calc-card:hover .calc-card-link svg {
  transform: translateX(4px);
}

/* Calculator Page Layout */
.calc-page {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  padding: 2rem 0 4rem;
}

@media (max-width: 1024px) {
  .calc-page {
    grid-template-columns: 1fr;
  }
}

.calc-main {
  min-width: 0;
}

.calc-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Calculator Widget */
.calculator-widget {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
}

.calculator-widget h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.calculator-widget .subtitle {
  color: var(--gray-600);
  margin-bottom: 2rem;
}

/* Form Elements */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--gray-700);
}

.form-hint {
  font-size: 0.875rem;
  color: var(--gray-500);
  font-weight: 400;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: all 0.2s;
  background: var(--white);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.input-group {
  position: relative;
}

.input-prefix,
.input-suffix {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-500);
  font-weight: 500;
}

.input-prefix {
  left: 1rem;
}

.input-suffix {
  right: 1rem;
}

.input-group .form-input.has-prefix {
  padding-left: 2.5rem;
}

.input-group .form-input.has-suffix {
  padding-right: 3rem;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 16px;
  padding-right: 2.5rem;
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
}

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

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

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
}

.btn-secondary:hover {
  background: var(--gray-200);
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.125rem;
}

.btn-full {
  width: 100%;
}

/* Result Display */
.result-box {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  color: var(--white);
  text-align: center;
  margin-top: 1.5rem;
}

.result-label {
  font-size: 0.875rem;
  opacity: 0.9;
  margin-bottom: 0.25rem;
}

.result-value {
  font-size: 2.5rem;
  font-weight: 800;
}

.result-details {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.2);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  text-align: center;
}

.result-detail-item {
  font-size: 0.875rem;
}

.result-detail-value {
  font-size: 1.25rem;
  font-weight: 700;
}

/* Content Sections */
.content-section {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin-top: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
}

.content-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.content-section h3 {
  font-size: 1.125rem;
  margin: 1.5rem 0 0.75rem;
}

.content-section ul, .content-section ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

.content-section li {
  margin-bottom: 0.5rem;
}

.formula-box {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 1.5rem;
  font-family: 'Fira Code', monospace;
  font-size: 1.125rem;
  text-align: center;
  margin: 1rem 0;
  border-left: 4px solid var(--primary);
}

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

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--gray-50);
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  color: var(--gray-800);
  transition: background 0.2s;
}

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

.faq-question svg {
  width: 20px;
  height: 20px;
  transition: transform 0.3s;
  flex-shrink: 0;
}

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

.faq-answer {
  display: none;
  padding: 1rem 1.25rem;
  color: var(--gray-600);
}

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

/* Sidebar Widgets */
.sidebar-widget {
  background: var(--white);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
}

.sidebar-widget h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--gray-200);
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.related-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem;
  border-radius: var(--radius);
  color: var(--gray-700);
  transition: all 0.2s;
}

.related-item:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

.related-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  flex-shrink: 0;
}

/* You Might Also Need */
.also-need {
  background: var(--gray-100);
  padding: 3rem 0;
  margin-top: 3rem;
}

.also-need h2 {
  text-align: center;
  margin-bottom: 2rem;
}

.also-need .calc-grid {
  max-width: 900px;
  margin: 0 auto;
}

/* Footer */
.footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 3rem 0 2rem;
  margin-top: auto;
}

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

@media (max-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

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

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

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-col h4 {
  color: var(--white);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.625rem;
}

.footer-links a {
  color: var(--gray-400);
  font-size: 0.875rem;
  transition: color 0.2s;
}

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

.footer-bottom {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--gray-800);
  text-align: center;
  font-size: 0.875rem;
}

/* Utilities */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

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

.fade-in {
  animation: fadeIn 0.3s ease-out;
}

/* Print styles */
@media print {
  .header, .nav, .sidebar, .footer, .also-need { display: none; }
  .calc-page { display: block; }
  .calculator-widget { box-shadow: none; border: 1px solid #ccc; }
}