/* 
 * FitNirvana Design System Stylesheet
 * Contains Layout, Typography, Themes, Components, and Responsive styles.
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700;800&display=swap');

:root {
  /* Colors - Light Mode */
  --color-primary: #22c55e;
  --color-primary-dark: #16a34a;
  --color-accent: #84cc16;
  --color-bg-body: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-header: rgba(255, 255, 255, 0.8);
  --color-text-main: #111827;
  --color-text-muted: #4b5563;
  --color-text-light: #9ca3af;
  --color-border: #e2e8f0;
  --color-shadow: rgba(0, 0, 0, 0.04);
  --color-shadow-hover: rgba(0, 0, 0, 0.08);
  --color-input-bg: #ffffff;
  --color-error: #ef4444;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-info: #3b82f6;

  /* Font Families */
  --font-heading: 'Poppins', 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* Transitions */
  --transition-speed: 0.3s;
  --transition-cubic: cubic-bezier(0.4, 0, 0.2, 1);

  /* Dimensions */
  --header-height: 72px;
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.75rem;
  --border-radius-lg: 1.25rem;
  --border-radius-xl: 2rem;
  --container-width: 1200px;
}

[data-theme="dark"] {
  /* Colors - Dark Mode */
  --color-bg-body: #0f172a;
  --color-bg-card: #1e293b;
  --color-bg-header: rgba(15, 23, 42, 0.8);
  --color-text-main: #f1f5f9;
  --color-text-muted: #94a3b8;
  --color-text-light: #64748b;
  --color-border: #334155;
  --color-shadow: rgba(0, 0, 0, 0.3);
  --color-shadow-hover: rgba(0, 0, 0, 0.4);
  --color-input-bg: #1e293b;
}

/* Reset and Base Styles */
*, *::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-body);
  background-color: var(--color-bg-body);
  color: var(--color-text-main);
  line-height: 1.6;
  transition: background-color var(--transition-speed) var(--transition-cubic), 
              color var(--transition-speed) var(--transition-cubic);
  overflow-x: hidden;
}

/* Accessibility: Keyboard outlines */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
}

/* Skip to Content link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 0 0 var(--border-radius-md) var(--border-radius-md);
  font-weight: 600;
  z-index: 9999;
  transition: top 0.2s;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: var(--color-bg-header);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  z-index: 1000;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-text-main);
  text-decoration: none;
}

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

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-speed);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Header Buttons */
.theme-btn, .search-toggle-btn, .menu-toggle-btn {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.theme-btn:hover, .search-toggle-btn:hover {
  background-color: var(--color-border);
}

.theme-btn svg, .search-toggle-btn svg, .menu-toggle-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.menu-toggle-btn {
  display: none;
}

/* Reading Progress Bar */
.reading-progress-container {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: 4px;
  background-color: transparent;
  z-index: 1001;
  pointer-events: none;
}

.reading-progress-bar {
  height: 100%;
  width: 0%;
  background-color: var(--color-primary);
  transition: width 0.1s ease;
}

/* Global Search Modal Overlay */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(8px);
  z-index: 1010;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10%;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-speed), visibility var(--transition-speed);
}

.search-modal.open {
  opacity: 1;
  visibility: visible;
}

.search-modal-content {
  background-color: var(--color-bg-card);
  width: 100%;
  max-width: 600px;
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  box-shadow: 0 20px 25px -5px var(--color-shadow);
  border: 1px solid var(--color-border);
  transform: translateY(-20px);
  transition: transform var(--transition-speed) var(--transition-cubic);
}

.search-modal.open .search-modal-content {
  transform: translateY(0);
}

.search-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.search-modal-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
}

.search-close-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
}

.search-input-wrapper {
  position: relative;
  margin-bottom: 1.5rem;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-input-bg);
  color: var(--color-text-main);
  font-size: 1rem;
}

.search-input-wrapper svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  fill: var(--color-text-light);
}

.search-results-list {
  list-style: none;
  max-height: 300px;
  overflow-y: auto;
}

.search-results-list li a {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius-sm);
  text-decoration: none;
  color: var(--color-text-main);
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.2s;
}

.search-results-list li a:hover {
  background-color: var(--color-border);
}

.search-results-list li a span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  display: block;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 600;
  text-decoration: none;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-speed) var(--transition-cubic);
  border: none;
  gap: 0.5rem;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.3);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
}

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

.btn-accent {
  background-color: var(--color-accent);
  color: #111827;
}

.btn-accent:hover {
  background-color: #72b212;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(132, 204, 22, 0.3);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: var(--border-radius-sm);
}

.btn-full {
  width: 100%;
}

/* Card Component */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 2rem;
  box-shadow: 0 4px 6px -1px var(--color-shadow);
  transition: box-shadow var(--transition-speed), transform var(--transition-speed);
}

.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px -3px var(--color-shadow-hover);
}

/* Hero Section */
.hero {
  position: relative;
  overflow: hidden;
  padding: 8rem 0 5rem 0;
  background: var(--color-bg);
  text-align: center;
}

/* Background Animated Blobs */
.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  z-index: 1;
  opacity: 0.12;
  pointer-events: none;
  animation: float-blob 15s infinite alternate ease-in-out;
}

.hero-blob-1 {
  width: 300px;
  height: 300px;
  background: var(--color-primary);
  top: -10%;
  right: 10%;
  animation-duration: 18s;
}

.hero-blob-2 {
  width: 400px;
  height: 400px;
  background: #84cc16;
  bottom: -20%;
  left: -10%;
  animation-duration: 22s;
}

@keyframes float-blob {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(40px, -40px) scale(1.1);
  }
  100% {
    transform: translate(-30px, 30px) scale(0.9);
  }
}

.colorful-text {
  background: linear-gradient(135deg, var(--color-primary), #84cc16);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  color: var(--color-text-main);
  margin-bottom: 1rem;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s forwards 0.2s;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 700px;
  margin: 0 auto 2rem auto;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s forwards 0.4s;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  margin-bottom: 2rem;
  list-style: none;
  flex-wrap: wrap;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-light);
}

.breadcrumbs a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-speed);
}

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

/* Sections Setup */
section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 3rem auto;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  color: var(--color-text-main);
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--color-text-muted);
  font-size: 1.1rem;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

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

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* Homepage Calculator Search & Tabs */
.search-container-home {
  max-width: 600px;
  margin: 0 auto 3rem auto;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s forwards 0.6s;
}

.search-container-home input {
  width: 100%;
  padding: 1rem 1rem 1rem 3rem;
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  color: var(--color-text-main);
  box-shadow: 0 10px 15px -3px var(--color-shadow);
  font-size: 1.1rem;
}

.search-container-home svg {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  fill: var(--color-text-light);
}

/* Popular Cards & Featured Grid */
.calculator-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.calculator-card .card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-md);
  background-color: rgba(34, 197, 94, 0.1);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.calculator-card .card-icon svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.calculator-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.calculator-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* Calculator Page Layout */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.calculator-form-container {
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.input-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-input-bg);
  color: var(--color-text-main);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition-speed);
}

.input-control:focus {
  border-color: var(--color-primary);
  outline: none;
}

.input-unit-wrapper {
  position: relative;
  display: flex;
}

.input-unit-wrapper input {
  padding-right: 3.5rem;
}

.input-unit-label {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.875rem;
  color: var(--color-text-light);
  font-weight: 500;
}

/* Radio Cards (Metric / Imperial / Gender toggles) */
.radio-card-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.radio-card {
  position: relative;
}

.radio-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-card-label {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-speed);
  text-align: center;
}

.radio-card input[type="radio"]:checked + .radio-card-label {
  border-color: var(--color-primary);
  background-color: rgba(34, 197, 94, 0.05);
  color: var(--color-primary);
}

/* Form Tabs */
.form-tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 1.5rem;
  gap: 1.5rem;
}

.form-tab-btn {
  background: none;
  border: none;
  padding: 0.75rem 0.25rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  position: relative;
  transition: color var(--transition-speed);
}

.form-tab-btn.active {
  color: var(--color-primary);
}

.form-tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-primary);
}

/* Calculator Result Module */
.calculator-results-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 400px;
  text-align: center;
}

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

.result-placeholder svg {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
  fill: currentColor;
}

.result-display-wrapper {
  width: 100%;
}

.result-number-box {
  background-color: rgba(34, 197, 94, 0.05);
  border: 1px solid rgba(34, 197, 94, 0.2);
  padding: 2rem;
  border-radius: var(--border-radius-md);
  margin-bottom: 1.5rem;
}

.result-value {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.result-label {
  font-size: 1rem;
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-gauge {
  height: 8px;
  background-color: var(--color-border);
  border-radius: 4px;
  position: relative;
  margin: 2.5rem 0;
}

.result-gauge-fill {
  height: 100%;
  background: linear-gradient(to right, var(--color-accent), var(--color-primary));
  border-radius: 4px;
  width: 0%;
  transition: width 1s ease-out;
}

.result-gauge-pointer {
  position: absolute;
  top: -6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #fff;
  border: 4px solid var(--color-primary);
  transform: translateX(-50%);
  left: 0%;
  transition: left 1s ease-out;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.result-recommendation {
  background-color: var(--color-bg-body);
  border-left: 4px solid var(--color-info);
  padding: 1.25rem;
  border-radius: 0 var(--border-radius-md) var(--border-radius-md) 0;
  text-align: left;
  margin-bottom: 1.5rem;
}

.result-recommendation h4 {
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.result-recommendation.normal {
  border-left-color: var(--color-success);
}
.result-recommendation.warning {
  border-left-color: var(--color-warning);
}
.result-recommendation.danger {
  border-left-color: var(--color-error);
}

/* Calculator Tools Actions (Copy, PDF, Share, Save) */
.result-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.action-btn {
  background-color: var(--color-bg-body);
  border: 1px solid var(--color-border);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius-sm);
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  transition: background-color 0.2s, color 0.2s;
}

.action-btn:hover {
  background-color: var(--color-border);
  color: var(--color-text-main);
}

.action-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* Side Widget - Recent Calculations / Favorites */
.history-widget {
  margin-top: 2rem;
}

.history-list {
  list-style: none;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 0.9rem;
}

.history-item-val {
  font-weight: 600;
}

.history-clear-btn {
  background: none;
  border: none;
  color: var(--color-error);
  font-size: 0.85rem;
  cursor: pointer;
  font-weight: 500;
}

/* Accordion FAQs */
.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0.5rem;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-main);
  cursor: pointer;
}

.faq-question svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  transition: transform var(--transition-speed);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-speed) ease-out, padding var(--transition-speed) ease-out;
  padding: 0 0.5rem;
  color: var(--color-text-muted);
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding-bottom: 1.5rem;
}

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

/* Article Copy layout (SEO & Blog Articles) */
.article-container {
  display: grid;
  grid-template-columns: 3fr 1fr;
  gap: 3rem;
  align-items: start;
}

.article-content {
  color: var(--color-text-main);
}

.article-content h2 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 700;
}

.article-content h3 {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.article-content p {
  margin-bottom: 1.25rem;
  color: var(--color-text-muted);
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--color-text-muted);
}

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

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2rem;
  margin-top: 1rem;
}

.article-content th, .article-content td {
  border: 1px solid var(--color-border);
  padding: 0.75rem;
  text-align: left;
}

.article-content th {
  background-color: rgba(34, 197, 94, 0.05);
  font-family: var(--font-heading);
  font-weight: 600;
}

.article-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding-left: 1.25rem;
  font-style: italic;
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
}

/* Table of Contents Widget */
.toc-card {
  position: sticky;
  top: calc(var(--header-height) + 1.5rem);
}

.toc-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.toc-list {
  list-style: none;
}

.toc-list li {
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.toc-link {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.toc-link:hover {
  color: var(--color-primary);
}

/* Newsletter Form block */
.newsletter-section {
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.newsletter-box {
  max-width: 600px;
  margin: 0 auto;
}

.newsletter-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.newsletter-form input {
  flex-grow: 1;
}

/* Footer Section */
footer {
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  padding: 4rem 0 2rem 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: var(--color-text-main);
  font-family: var(--font-heading);
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
  font-weight: 600;
}

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

.footer-col ul li {
  margin-bottom: 0.75rem;
}

.footer-col ul a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

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

.footer-socials {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.social-icon-btn {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.social-icon-btn:hover {
  color: var(--color-primary);
}

.social-icon-btn svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.footer-disclaimer {
  border-top: 1px solid var(--color-border);
  padding-top: 2rem;
  font-size: 0.8rem;
  color: var(--color-text-light);
  line-height: 1.5;
  text-align: center;
  margin-bottom: 1.5rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
}

/* Cookie Banner Overlay */
.cookie-banner {
  position: fixed;
  bottom: 2rem;
  left: 2rem;
  right: 2rem;
  max-width: 600px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: 1.5rem;
  box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition-speed), transform var(--transition-speed), visibility var(--transition-speed);
}

.cookie-banner.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.cookie-banner-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Back To Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-speed), visibility var(--transition-speed), transform var(--transition-speed);
  z-index: 999;
}

.back-to-top.show {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: scale(1.1);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.hidden-card {
  display: none !important;
}

/* Responsive Overrides */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }
  .article-container {
    grid-template-columns: 1fr;
  }
  .toc-card {
    position: static;
    margin-bottom: 2rem;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .grid-2, .grid-4, .calculator-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
  .menu-toggle-btn {
    display: flex;
  }
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-bg-card);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem;
    gap: 1.5rem;
    transition: left var(--transition-speed) var(--transition-cubic);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 10px 15px -3px var(--color-shadow);
  }
  .nav-menu.open {
    left: 0;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  .cookie-banner {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }
  .calculator-card {
    padding: 1.25rem;
  }
  .calculator-card .card-icon {
    width: 36px;
    height: 36px;
    margin-bottom: 0.75rem;
    border-radius: var(--border-radius-sm);
  }
  .calculator-card .card-icon svg {
    width: 18px;
    height: 18px;
  }
  .calculator-card h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
  }
  .calculator-card p {
    display: none !important;
  }
  .calculator-card .btn {
    margin-top: auto;
    padding: 0.5rem;
    font-size: 0.85rem;
  }
}

/* Print Styles */
@media print {
  body {
    background-color: #fff;
    color: #000;
  }
  header, footer, .newsletter-section, .toc-card, .result-actions, .history-widget, .cookie-banner, .back-to-top {
    display: none !important;
  }
  .container {
    padding: 0;
    max-width: 100%;
  }
  .calculator-grid {
    display: block;
  }
  .calculator-form-container {
    border: none;
    box-shadow: none;
    padding: 0;
  }
  .calculator-results-container {
    page-break-before: always;
    border: none;
    box-shadow: none;
  }
  .result-value {
    color: #000;
  }
}