/* main.css - Redesigned stylesheet for 1000 Calculators with three-column layout */

/* ----------------------------------------------------------------------
   1. CSS Variables & Theme System
---------------------------------------------------------------------- */
:root {
  /* Light Theme (Default) */
  --primary: #1E3A8A;
  --primary-rgb: 30, 58, 138;
  --accent: #F59E0B;
  --accent-rgb: 245, 158, 11;
  --neutral: #E5E7EB;
  --neutral-rgb: 229, 231, 235;
  --success: #22C55E;
  --success-rgb: 34, 197, 94;
  --error: #EF4444;
  --error-rgb: 239, 68, 68;
  --text: #111827;
  --text-muted: #6B7280;
  --bg: #F9FAFB;
  --card-bg: #FFFFFF;
  --input-bg: #F3F4F6;
  --border: #D1D5DB;
  --footer-bg: #F1F5F9;
  --gradient: linear-gradient(135deg, var(--primary), var(--accent));
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.12);
  
  /* Spacing */
  --spacing-xs: clamp(0.4rem, 1vw, 0.5rem);
  --spacing-sm: clamp(0.75rem, 2vw, 1rem);
  --spacing-md: clamp(1rem, 3vw, 1.5rem);
  --spacing-lg: clamp(1.5rem, 4vw, 2rem);
  --spacing-xl: clamp(2rem, 5vw, 3rem);
  --spacing-2xl: clamp(3rem, 6vw, 4rem);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, sans-serif;
  --font-heading: 'Poppins', serif;
  --font-mono: 'Fira Code', monospace;
  
  /* Border Radius */
  --radius-sm: clamp(6px, 1vw, 8px);
  --radius-md: clamp(8px, 1.5vw, 10px);
  --radius-lg: clamp(12px, 2vw, 16px);
  
  /* Transitions */
  --transition: all 0.2s ease;
}

/* Dark Theme */
.dark {
  --primary: #3B82F6;
  --primary-rgb: 59, 130, 246;
  --accent: #FBBF24;
  --accent-rgb: 251, 191, 36;
  --neutral: #1F2937;
  --neutral-rgb: 31, 41, 55;
  --text: #F3F4F6;
  --text-muted: #9CA3AF;
  --bg: #111827;
  --card-bg: #1F2937;
  --input-bg: #374151;
  --border: #4B5563;
  --footer-bg: #1F2937;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.4);
}

/* ----------------------------------------------------------------------
   2. Base Styles & Reset
---------------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  font-size: clamp(13px, 2vw, 14px);
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--text);
  background: var(--bg);
  transition: var(--transition);
}

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

a:hover,
a:focus {
  color: var(--accent);
  outline: none;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--text);
  line-height: 1.3;
  font-weight: 700;
}

h1 { font-size: clamp(24px, 3vw, 28px); }
h2 { font-size: clamp(20px, 2.5vw, 22px); }
h3 { font-size: clamp(16px, 2vw, 18px); }
h4 { font-size: clamp(14px, 1.8vw, 16px); }

.container {
  max-width: clamp(1000px, 90vw, 1200px);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.responsive-container {
  max-width: clamp(400px, 80vw, 600px);
  margin: 0 auto;
}

/* ----------------------------------------------------------------------
   3. Header/Navbar
---------------------------------------------------------------------- */
.navbar {
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
}

.logo {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.nav-links {
  display: flex;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

.nav-links a {
  font-weight: 600;
  font-size: clamp(13px, 1.8vw, 14px);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: var(--transition);
  min-height: 32px;
}

.nav-links a:hover {
  background: linear-gradient(135deg, var(--accent), var(--primary));
  color: var(--card-bg);
}

.nav-links a.active {
  background: var(--gradient);
  color: var(--card-bg);
  font-weight: 700;
  transform: scale(1.02);
}

.nav-links a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  color: var(--text);
  cursor: pointer;
  transition: var(--transition);
}

/* Theme Toggle Button */
.theme-toggle {
  width: clamp(36px, 5vw, 40px);
  height: clamp(20px, 3vw, 24px);
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: clamp(10px, 1.5vw, 12px);
  cursor: pointer;
  font-family: var(--font-primary);
  font-size: clamp(12px, 1.8vw, 14px);
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  z-index: 1001;
}

.dark .theme-toggle {
  color: var(--accent);
}

.theme-toggle:hover,
.theme-toggle:focus {
  border-color: var(--accent);
  box-shadow: 0 0 8px rgba(var(--accent-rgb), 0.3);
  transform: scale(1.03);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ----------------------------------------------------------------------
   4. Hero Section
---------------------------------------------------------------------- */
.hero {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-md);
  background: linear-gradient(180deg, rgba(var(--primary-rgb), 0.08), var(--bg));
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: clamp(80px, 10vw, 100px);
  background: var(--gradient);
  opacity: 0.1;
  z-index: -1;
}

.hero h1 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.hero p {
  max-width: clamp(600px, 70vw, 700px);
  margin: 0 auto var(--spacing-md);
  color: var(--text-muted);
  font-size: clamp(13px, 1.8vw, 14px);
}

.hero .btn-primary {
  display: inline-block;
  margin-top: var(--spacing-sm);
}

/* Search Box */
.search-box {
  max-width: clamp(400px, 60vw, 600px);
  margin: 0 auto var(--spacing-md);
}

.search-box .form-group {
  position: relative;
}

.search-box label {
  display: block;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--spacing-xs);
  font-size: clamp(13px, 1.8vw, 14px);
}

.search-box .input-wrapper {
  position: relative;
}

.search-box input {
  width: 100%;
  padding: var(--spacing-xs) calc(var(--spacing-sm) + 1.5rem) var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--input-bg);
  font-size: clamp(13px, 1.8vw, 14px);
  color: var(--text);
  transition: var(--transition);
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.15);
  outline: none;
}

.search-box input::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.input-icon {
  position: absolute;
  right: var(--spacing-sm);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: clamp(0.9rem, 2vw, 1rem);
}

.suggestions {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  max-height: clamp(250px, 50vh, 300px);
  overflow-y: auto;
  z-index: 1000;
  display: none;
}

.suggestions.active {
  display: block;
  animation: slideIn 0.2s ease;
}

.suggestion-item {
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.suggestion-item:hover,
.suggestion-item.highlight {
  background: rgba(var(--primary-rgb), 0.1);
}

.calc-name {
  font-weight: 600;
  color: var(--text);
  font-size: clamp(13px, 1.8vw, 14px);
}

.calc-cat {
  font-size: clamp(11px, 1.5vw, 12px);
  color: var(--text-muted);
  background: rgba(var(--primary-rgb), 0.1);
  padding: 0.25rem var(--spacing-xs);
  border-radius: var(--radius-sm);
}

.no-result {
  padding: var(--spacing-sm);
  text-align: center;
  color: var(--text-muted);
  font-size: clamp(13px, 1.8vw, 14px);
  font-style: italic;
  display: none;
}

.no-result.active {
  display: block;
}

/* ----------------------------------------------------------------------
   5. Three-Column Layout (Calculators Page)
---------------------------------------------------------------------- */
.page-content-wrapper {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.three-column-layout {
  display: grid;
  grid-template-columns: 250px 1fr 300px;
  gap: var(--spacing-md);
  padding: var(--spacing-md) 0;
  align-items: start;
}

.sidebar.left-column {
  padding: var(--spacing-md);
  background: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 90px;
}

.sidebar.left-column h4 {
  font-size: clamp(14px, 1.8vw, 16px);
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
  padding-bottom: var(--spacing-xs);
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
}

.sidebar.left-column ul {
  list-style: none;
  padding: 0;
}

.category-list li {
  margin-bottom: var(--spacing-xs);
}

.category-list a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--text-muted);
  font-size: clamp(13px, 1.8vw, 14px);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.category-list a:hover,
.category-list a.active {
  color: var(--primary);
  background: rgba(var(--primary-rgb), 0.1);
  font-weight: 600;
}

.main-content-area {
  min-width: 0;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

.main-content-area .container {
  padding: 0;
}

/* Calculator Form */
.calculator-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.calculator-form h2 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.calculator-form .form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.calculator-form label {
  font-weight: 600;
  color: var(--text);
  font-size: clamp(13px, 1.8vw, 14px);
}

.calculator-form input {
  width: 100%;
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--input-bg);
  font-size: clamp(13px, 1.8vw, 14px);
  color: var(--text);
  font-family: var(--font-primary);
  transition: var(--transition);
}

.calculator-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.15);
  outline: none;
}

.calculator-form input::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.calculator-form input.error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(var(--error-rgb), 0.2);
}

.calculator-form button {
  background: var(--gradient);
  color: var(--card-bg);
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(13px, 1.8vw, 14px);
  cursor: pointer;
  transition: var(--transition);
  align-self: flex-start;
}

.calculator-form button:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--accent), var(--primary));
}

.calculator-form button:active {
  transform: scale(0.98);
}

.result {
  margin-top: var(--spacing-md);
  font-weight: 600;
  font-size: clamp(14px, 2vw, 16px);
  color: var(--success);
}

.result.error {
  color: var(--error);
}

.form-text {
  font-size: clamp(11px, 1.5vw, 12px);
  color: var(--text-muted);
}

/* Article Section */
.article-section {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border);
}

.article-section h2,
.article-section h3 {
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.article-section p {
  margin-bottom: var(--spacing-md);
  color: var(--text);
  line-height: 1.6;
}

.article-section ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--text);
}

.right-column {
  position: sticky;
  top: 90px;
}

.ad-placeholder.right-ad {
  background: var(--neutral);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  height: 600px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: clamp(13px, 1.8vw, 14px);
  text-align: center;
  transition: var(--transition);
}

/* ----------------------------------------------------------------------
   6. Category Section - ULTRA VIBRANT & MODERN CATEGORY CARD SYSTEM
---------------------------------------------------------------------- */
.categories {
  padding: var(--spacing-xl) 0;
}

.section-title {
  font-family: var(--font-heading);
  text-align: center;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(clamp(250px, 30vw, 280px), 1fr));
  gap: var(--spacing-md);
}

.cat-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  box-shadow: 0 10px 20px rgba(var(--primary-rgb), 0.1), 0 0 0 1px var(--border);
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.4s ease;
  position: relative;
  overflow: hidden;
  will-change: transform, box-shadow;
}

.cat-card:hover {
  transform: translateY(-10px) rotateX(2deg) scale(1.04);
  box-shadow: 0 15px 30px rgba(var(--accent-rgb), 0.4), 0 0 25px rgba(var(--primary-rgb), 0.3);
  border-color: transparent;
}

.cat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 100% 100%, rgba(var(--accent-rgb), 0.15), transparent 40%);
  opacity: 0;
  transition: opacity 0.4s ease;
  z-index: 1;
  border-radius: var(--radius-lg);
}

.cat-card:hover::before {
  opacity: 1;
}

.cat-card .icon {
  font-size: clamp(3rem, 5vw, 3.5rem);
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
  text-shadow: 0 0 5px rgba(var(--primary-rgb), 0.4);
  transition: transform 0.4s cubic-bezier(0.25, 0.8, 0.25, 1), color 0.3s ease;
  position: relative;
  z-index: 2;
}

.cat-card:hover .icon {
  transform: scale(1.2) rotate(3deg);
  color: var(--accent);
}

.cat-card h3,
.cat-card p {
  position: relative;
  z-index: 2;
  transition: color 0.3s ease;
}

.cat-card:hover h3 {
  color: var(--text);
}

.cat-card:hover p {
  color: var(--text);
}

/* ----------------------------------------------------------------------
   7. Ad Placeholders
---------------------------------------------------------------------- */
.ad-placeholder {
  background: var(--neutral);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  text-align: center;
  color: var(--text-muted);
  font-size: clamp(13px, 1.8vw, 14px);
  transition: var(--transition);
}

.ad-placeholder:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.ad-placeholder.right-ad:hover {
  transform: none;
  box-shadow: none;
}

/* ----------------------------------------------------------------------
   8. Newsletter Section
---------------------------------------------------------------------- */
.newsletter-section {
  padding: clamp(2rem, 5vw, 3rem) clamp(0.75rem, 3vw, 1.5rem);
  background: var(--card-bg);
  border-radius: var(--radius-md);
  margin: var(--spacing-xl) auto;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.newsletter-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient);
}

.newsletter-inner {
  max-width: clamp(350px, 70vw, 500px);
  margin: 0 auto;
  text-align: center;
}

.newsletter-inner h2 {
  color: var(--primary);
  font-size: clamp(20px, 2.5vw, 22px);
  margin-bottom: var(--spacing-sm);
  font-weight: 700;
}

.newsletter-inner p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
  font-size: clamp(13px, 1.8vw, 14px);
  line-height: 1.6;
}

.newsletter-form {
  display: flex;
  flex-direction: column;
  gap: clamp(0.5rem, 2vw, 0.75rem);
  align-items: center;
  max-width: 100%;
}

.newsletter-form .form-group {
  width: clamp(60%, 50vw, 100%);
}

.newsletter-form label {
  font-weight: 600;
  color: var(--text);
  font-size: clamp(13px, 1.8vw, 14px);
  margin-bottom: var(--spacing-xs);
  display: block;
  text-align: left;
}

.newsletter-form .input-wrapper {
  position: relative;
}

.newsletter-form input {
  width: 100%;
  padding: clamp(0.5rem, 2vw, 1rem) calc(clamp(0.75rem, 2vw, 1rem) + 1.5rem) clamp(0.5rem, 2vw, 1rem) clamp(0.75rem, 2vw, 1rem);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--input-bg);
  font-size: clamp(13px, 1.8vw, 14px);
  color: var(--text);
  transition: var(--transition);
}

.newsletter-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.2);
  outline: none;
}

.newsletter-form input::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.newsletter-form input.error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(var(--error-rgb), 0.2);
}

.newsletter-form .input-icon {
  position: absolute;
  right: clamp(0.75rem, 2vw, 1rem);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: clamp(0.9rem, 2vw, 1rem);
  transition: opacity 0.2s ease;
}

.newsletter-form input:focus + .input-icon {
  opacity: 0.7;
}

.newsletter-form button,
.btn-primary {
  background: var(--gradient);
  color: var(--card-bg);
  border: none;
  padding: clamp(0.5rem, 2vw, 1rem) clamp(1.5rem, 5vw, 2.5rem);
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(13px, 1.8vw, 14px);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  width: clamp(60%, 50vw, 100%);
  max-width: clamp(160px, 40vw, 200px);
  margin: 0 auto;
}

.newsletter-form button:hover,
.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--accent), var(--primary));
}

.newsletter-form button:active,
.btn-primary:active {
  transform: scale(0.98);
}

.form-error,
.success-message {
  font-size: clamp(11px, 1.5vw, 12px);
  margin-top: var(--spacing-xs);
  text-align: center;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.form-error {
  color: var(--error);
}

.success-message {
  color: var(--success);
}

.form-error.is-visible,
.success-message.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.small-text {
  font-size: clamp(11px, 1.5vw, 12px);
  color: var(--text-muted);
  margin-top: var(--spacing-sm);
}

/* ----------------------------------------------------------------------
   9. Footer
---------------------------------------------------------------------- */
.footer {
  background: var(--footer-bg);
  padding: var(--spacing-xl) 0;
  border-top: 2px solid var(--accent);
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(clamp(200px, 25vw, 250px), 1fr));
  gap: var(--spacing-md);
}

.footer-section h4 {
  font-family: var(--font-heading);
  font-size: clamp(14px, 1.8vw, 16px);
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.footer-section p,
.footer-section ul li {
  color: var(--text-muted);
  font-size: clamp(13px, 1.8vw, 14px);
}

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

.footer-section a {
  color: var(--text-muted);
  transition: var(--transition);
}

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

.footer-social {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.footer-social a {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-social a:hover {
  color: var(--accent);
  transform: scale(1.1);
}

/* ----------------------------------------------------------------------
   10. Visitor Count
---------------------------------------------------------------------- */
.visitor-count-box {
  text-align: center;
  margin: var(--spacing-md) 0;
  color: var(--text-muted);
  font-size: clamp(13px, 1.8vw, 14px);
}

.count-icon {
  font-size: clamp(1rem, 2vw, 1.2rem);
  margin-right: var(--spacing-xs);
}

.count-number {
  font-weight: 600;
  color: var(--primary);
}

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

@keyframes fadeScale {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

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

.cat-card,
.newsletter-section,
.footer,
.calculator-form,
.article-section {
  animation: fadeScale 0.4s ease;
}

.suggestions.active {
  animation: slideIn 0.2s ease;
}

.form-error.is-visible,
.success-message.is-visible {
  animation: slideUp 0.3s ease;
}

/* ----------------------------------------------------------------------
   12. Utility Classes
---------------------------------------------------------------------- */
.hidden {
  display: none !important;
}

.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;
}

.error {
  border-color: var(--error) !important;
  box-shadow: 0 0 0 3px rgba(var(--error-rgb), 0.2) !important;
}

.success {
  color: var(--success) !important;
}

/* ----------------------------------------------------------------------
   13. Calculator Specific Styles
---------------------------------------------------------------------- */

/* Macro Calculator */
.macro-display.hidden { display: none; }
.macro-pie {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  position: relative;
  margin: 20px auto;
  background: conic-gradient(#e74c3c 0%, #f39c12 0%, #27ae60 0%);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
.macro-pie::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 120px; height: 120px;
  background: white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}
.macro-legend {
  display: flex; justify-content: center; gap: 20px; margin-top: 15px; flex-wrap: wrap;
}
.legend-item {
  display: flex; align-items: center; gap: 8px; font-size: 0.9rem;
}
.legend-color {
  width: 16px; height: 16px; border-radius: 50%;
}
.legend-color.protein { background: #e74c3c; }
.legend-color.carbs { background: #f39c12; }
.legend-color.fat { background: #27ae60; }
.macro-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 15px; margin: 20px 0;
}
.macro-card {
  border: 1px solid var(--border); border-radius: 8px; padding: 15px;
  text-align: center; background: var(--card-bg);
}
.macro-card h4 { margin: 0 0 8px; font-size: 1rem; color: var(--text); }
.macro-card .value { font-weight: 700; font-size: 1.4rem; color: var(--text); }
.macro-card .unit { font-size: 0.8rem; color: var(--text-muted); }

/* Sugar Intake Calculator */
:root{
  --safe:#27ae60;
  --warning:#f39c12;
  --danger:#e74c3c;
  --zero:#8e44ad;
  --keto:#3498db;
}

.sugar-meter{
  width:200px;height:100px;margin:20px auto;position:relative;overflow:hidden;
  background:linear-gradient(to right, var(--safe) 33%, var(--warning) 66%, var(--danger));
  border-radius:50px;
}
.sugar-meter::before{
  content:'';position:absolute;inset:0;background:var(--card-bg);
  clip-path:polygon(0 0, calc(100% - var(--sugar)) 0, calc(100% - var(--sugar)) 100%, 0 100%);
}
.meter-label{
  position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  font-weight:700;font-size:1.5rem;color:var(--text);
}

.sugar-badge{
  padding:8px 20px;border-radius:50px;color:#fff;font-weight:600;
  display:inline-block;margin:12px 0;
}
.safe{background:var(--safe)}
.warning{background:var(--warning)}
.danger{background:var(--danger)}
.zero{background:var(--zero)}
.keto{background:var(--keto)}

.food-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));
  gap:12px;margin:20px 0;
}
.food-card{
  background:var(--card-bg);border:2px solid var(--border);border-radius:12px;padding:12px;
  text-align:center;font-size:0.95rem;
}
.food-card.trap{border-color:var(--danger);color:var(--danger)}
.food-card.safe{border-color:var(--safe);color:var(--safe)}

.result-inner{text-align:center}
.limit{font-size:1.3rem;margin:12px 0}
.excess{color:var(--danger);font-weight:600}
.tip{color:var(--safe);font-style:italic}

/* Vegan Nutrition Calculator */
:root{
  --deficient:#e74c3c;
  --low:#f39c12;
  --optimal:#27ae60;
}

.vegan-rings{
  width:180px;height:180px;margin:20px auto;position:relative;
}
.ring{
  position:absolute;inset:0;border-radius:50%;
  background:conic-gradient(var(--optimal) 0% var(--level),var(--neutral) var(--level) 100%);
  mask:radial-gradient(transparent 65%,#000 68%);
}
.ring::after{
  content:attr(data-label);position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:1.2rem;color:var(--text);
}
.b12::after{content:'B12'}
.iron::after{content:'Iron'}
.deficient{--optimal:var(--deficient)}
.low{--optimal:var(--low)}

.needs-grid{
  display:grid;grid-template-columns:1fr;gap:12px;margin:16px 0;
  background:var(--neutral);padding:16px;border-radius:12px;
}
.need{
  background:var(--card-bg);padding:12px;border-left:4px solid var(--optimal);
  font-size:1rem;
}
.need strong{color:var(--optimal)}

.food-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:12px;margin:20px 0;
}
.food-card{
  background:var(--card-bg);border:2px solid var(--border);border-radius:12px;
  padding:12px;text-align:center;font-size:0.95rem;
  transition:transform .2s;
}
.food-card.swap{border-color:#27ae60}
.food-card:hover{transform:translateY(-4px);box-shadow:0 8px 20px rgba(0,0,0,.1)}

.result-inner{text-align:center}
.tip{color:#27ae60;font-style:italic;margin-top:12px}

/* Pregnancy Nutrition Calculator */
:root{
  --t1:#ff6b6b;
  --t2:#feca57;
  --t3:#48dbfb;
}

.preg-wheels{
  width:200px;height:200px;margin:20px auto;position:relative;
}
.wheel{
  position:absolute;inset:0;border-radius:50%;
  background:conic-gradient(var(--optimal) 0% var(--level),var(--neutral) var(--level) 100%);
  mask:radial-gradient(transparent 68%,#000 71%);
}
.wheel::after{
  content:attr(data-label);position:absolute;inset:0;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:1.3rem;color:var(--text);
}
.folate::after{content:'Folate'}
.iron::after{content:'Iron'}

.trimester-badge{
  padding:10px 24px;border-radius:50px;color:#fff;font-weight:700;
  display:inline-block;margin:12px 0;font-size:1.1rem;
}
.t1{background:var(--t1)}
.t2{background:var(--t2)}
.t3{background:var(--t3)}

.food-card.boost{border-color:var(--optimal);color:var(--optimal)}
.food-card.avoid{border-color:var(--deficient);color:var(--deficient)}

/* Burn Severity Calculator */
.burn-calculator { padding: 1.5rem 0; }

.method-tabs {
  display: flex;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1.5rem;
  gap: 0;
}
.tab-btn {
  flex: 1;
  padding: 0.75rem 1rem;
  background: var(--card-bg);
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}
.tab-btn::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary);
  transform: scaleX(0);
  transition: transform 0.2s;
}
.tab-btn.active::after { transform: scaleX(1); }
.tab-btn.active { color: var(--primary); }

.method-panel { display: none; }
.method-panel.active { display: block; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.body-regions { margin: 1.5rem 0; }
.region-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}
.region {
  background: var(--card-bg);
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
}
.region label { display: block; font-weight: 500; margin-bottom: 0.5rem; font-size: 0.9rem; }
.region-input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  font-family: var(--font-mono);
}

.lund-table-container { overflow-x: auto; margin: 1.5rem 0; }
.lund-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.lund-table th,
.lund-table td { padding: 0.75rem; text-align: center; border: 1px solid var(--border); }
.lund-table th { background: var(--neutral); font-weight: 600; }
.lund-input { width: 60px; padding: 0.5rem; text-align: center; }
.lund-input.full { width: 100%; }

.burn-degree-group { margin: 1.5rem 0; }
.radio-group { display: flex; flex-direction: column; gap: 0.5rem; }
.radio-group label { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; }

.results-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 0.75rem;
  box-shadow: var(--shadow-md);
  margin: 2rem 0;
}
.result-item { display: flex; justify-content: space-between; padding: 0.75rem 0; border-bottom: 1px solid var(--border); }
.result-item:last-child { border-bottom: none; }
.result-label { font-weight: 500; }
.result-value { font-family: var(--font-mono); font-weight: 700; font-size: 1.1rem; }
.severity-minor { color: var(--accent); }
.severity-moderate { color: var(--primary); }
.severity-major { color: var(--error); }

.action-note {
  padding: 1rem;
  background: rgba(var(--primary-rgb), 0.1);
  border-left: 4px solid var(--primary);
  border-radius: 0.5rem;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 1.5rem 0;
}

.disclaimer-note {
  background: rgba(var(--error-rgb), 0.1);
  padding: 1rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(var(--error-rgb), 0.3);
  color: var(--error);
  font-size: 0.9rem;
  margin: 1.5rem 0;
}

/* Maternal Age Risk Calculator */
.maternal-calculator { padding: 1.5rem 0; }

.age-input-group { max-width: 400px; margin: 0 auto 2rem; text-align: center; }
.large-input {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  padding: 1rem;
  border: 2px solid var(--border);
  border-radius: 1rem;
  font-family: var(--font-mono);
  transition: border 0.25s;
}
.large-input:focus { border-color: var(--primary); outline: none; }
.input-hint { margin-top: 0.5rem; font-size: 0.9rem; color: var(--text-muted); }

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}
.result-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 1rem;
  box-shadow: var(--shadow-md);
  text-align: center;
  border: 1px solid var(--border);
}
.result-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
  color: var(--primary);
}
.result-label {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.result-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.risk-summary {
  background: rgba(var(--primary-rgb), 0.1);
  padding: 1.25rem;
  border-radius: 0.75rem;
  border-left: 4px solid var(--primary);
  font-size: 1rem;
  line-height: 1.6;
  margin: 2rem 0;
}

/* Hydration Status Calculator */
.hydration-calculator { padding: 1.5rem 0; }

.urine-group { margin-bottom: 2rem; }
.urine-palette {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}
.urine-option {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.urine-swatch {
  width: 60px;
  height: 80px;
  border: 3px solid transparent;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}
.urine-swatch::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid var(--primary);
  border-radius: 0.5rem;
  opacity: 0;
  transition: opacity 0.2s;
}
input[type="radio"]:checked + .urine-swatch::after { opacity: 1; }
.urine-swatch:hover { transform: scale(1.05); }

/* Urine colors */
.urine-1 { background: #f7f3a3; }
.urine-2 { background: #f1e788; }
.urine-3 { background: #e6d967; }
.urine-4 { background: #d4c44a; }
.urine-5 { background: #b89c3a; }
.urine-6 { background: #9c7a2d; }

.symptoms-group { margin: 2rem 0; }
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}
.checkbox-grid label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
}

.status-well { color: var(--success); }
.status-mild { color: var(--accent); }
.status-moderate { color: var(--primary); }
.status-severe { color: var(--error); }

/* Child Growth Calculator */
.child-growth-calculator { padding: 1.5rem 0; }

.input-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.input-grid .form-group { margin: 0; }

.growth-status {
  background: rgba(var(--success-rgb), 0.1);
  padding: 1.25rem;
  border-radius: 0.75rem;
  border-left: 4px solid var(--success);
  font-size: 1rem;
  line-height: 1.6;
  margin: 2rem 0;
}

/* Pain Score Calculator */
.slider-container {
  margin: 20px 0;
}

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--neutral);
  outline: none;
  margin: 12px 0;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: none;
}

.slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  cursor: pointer;
  border: none;
}

.slider-value {
  text-align: center;
  font-size: 1.5em;
  font-weight: 700;
  color: var(--primary);
  margin-top: 8px;
}

.vas-line {
  position: relative;
  height: 40px;
  background: linear-gradient(to right, #d4edda, #f8d7da);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  margin: 16px 0;
}

.vas-marker {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  background: var(--primary);
  border-radius: 50%;
  display: none;
}

.faces-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin: 16px 0;
}

.face {
  text-align: center;
  cursor: pointer;
  padding: 8px;
  border: 2px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s ease;
}

.face:hover, .face:focus {
  outline: 2px solid var(--primary);
  border-color: var(--primary);
  background: rgba(var(--primary-rgb), 0.1);
}

.face.selected {
  border-color: var(--primary);
  background: rgba(var(--primary-rgb), 0.2);
  transform: scale(1.1);
}

.face img {
  width: 60px;
  height: 60px;
  object-fit: contain;
}

.face span {
  display: block;
  margin-top: 6px;
  font-weight: 600;
  font-size: 0.9em;
}

.pain-level {
  padding: 8px 12px;
  border-radius: 4px;
  font-weight: 600;
  display: inline-block;
}

.pain-none { background: #d4edda; color: #155724; }
.pain-mild { background: #fff3cd; color: #856404; }
.pain-moderate { background: #f8d7da; color: #721c24; }
.pain-severe { background: #721c24; color: #fff; }

/* Cardiac Output Calculator */
.input-with-unit {
  display: flex;
  gap: 8px;
  align-items: center;
}

.input-with-unit input {
  flex: 1;
}

.input-with-unit select {
  width: 80px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--input-bg);
  font-size: 0.9em;
}

.method-section {
  padding: 16px 0;
  border-top: 1px solid var(--border);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin: 16px 0;
  padding: 12px;
  background: var(--neutral);
  border-radius: 6px;
  font-size: 1em;
}

.result-grid div {
  text-align: center;
}

.highlight {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.1em;
}

/* Gestational Age Calculator */
.highlight {
  font-weight: 700;
  color: var(--primary);
  font-size: 1.1em;
}

/* Fetal Kick Counter */
.kick-counter-display {
  text-align: center;
  margin: 24px 0;
}

.counter-circle {
  width: 140px;
  height: 140px;
  margin: 0 auto 12px;
  border-radius: 50%;
  background: rgba(var(--primary-rgb), 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
  transition: background 0.3s;
}

#timeElapsed {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin: 8px 0;
}

#statusMessage {
  font-style: italic;
  color: var(--text-muted);
}

.kick-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 16px 0;
}

.kick-controls .btn {
  min-width: 120px;
}

.success-box {
  background: rgba(var(--success-rgb), 0.1);
  color: var(--success);
  padding: 12px;
  border-radius: 6px;
  border: 1px solid rgba(var(--success-rgb), 0.3);
  text-align: center;
  font-weight: 600;
}

/* Meditation Timer */
.timer-container {
  text-align: center;
  margin: 32px 0;
  padding: 24px;
  background: var(--neutral);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.timer-display {
  font-size: 4.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text);
  margin: 16px 0;
}

.timer-controls {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-large {
  padding: 12px 32px;
  font-size: 1.1rem;
}

.progress-ring {
  width: 200px;
  height: 200px;
  margin: 24px auto;
}

.progress-ring-circle {
  transition: stroke-dashoffset 0.3s ease;
}

.progress-ring-progress {
  transition: stroke-dashoffset 1s linear;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

/* Mindfulness Tracker */
.tracker-dashboard {
  text-align: center;
  margin: 32px 0;
  padding: 20px;
  background: var(--neutral);
  border-radius: 12px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.stat-card {
  background: var(--card-bg);
  padding: 16px;
  border-radius: 10px;
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--success);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.calendar-view {
  margin: 32px 0;
  padding: 20px;
  background: var(--neutral);
  border-radius: 12px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  margin: 16px 0;
  font-size: 0.9rem;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--input-bg);
  border-radius: 6px;
  font-weight: 500;
}

.calendar-day.practiced {
  background: var(--success);
  color: white;
}

.calendar-day.missed {
  background: var(--error);
  color: white;
}

.calendar-day.today {
  border: 2px solid var(--primary);
  font-weight: 700;
}

.calendar-legend {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.legend-color {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: middle;
}

.legend-color.practiced { background: var(--success); }
.legend-color.missed { background: var(--error); }
.legend-color.today { background: var(--primary); }

/* Stress Level Calculator */
.quiz-form {
  background: var(--neutral);
  padding: 24px;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.quiz-intro {
  margin-bottom: 20px;
  color: var(--text-muted);
  font-style: italic;
}

.quiz-question {
  margin-bottom: 24px;
}

.quiz-question label {
  display: block;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.radio-label {
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 8px 0;
  font-size: 0.95rem;
}

.radio-label input[type="radio"] {
  margin-right: 10px;
  accent-color: var(--primary);
}

.stress-score {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text);
  font-family: var(--font-mono);
}

.stress-level {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 8px 0;
}

.tips-list {
  margin: 16px 0;
  padding-left: 20px;
}

.tips-list li {
  margin: 8px 0;
  line-height: 1.5;
}

/* Happiness Index Calculator */
.happiness-score {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text);
  font-family: var(--font-mono);
}

.happiness-level {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 8px 0;
}

.score-bar {
  width: 100%;
  height: 12px;
  background: var(--neutral);
  border-radius: 6px;
  overflow: hidden;
  margin: 16px 0;
}

.score-fill {
  height: 100%;
  border-radius: 6px;
  transition: width 0.6s ease;
}

.icon-left {
  color: var(--primary);
  margin-right: 8px;
  font-size: 1.1em;
}

/* Music Therapy */
.music-selector {
  background: var(--neutral);
  padding: 28px;
  border-radius: 14px;
  text-align: center;
  margin-bottom: 32px;
  box-shadow: var(--shadow-sm);
}

.music-selector h2 {
  margin-top: 0;
  color: var(--text);
  font-size: 1.6rem;
}

.mood-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.mood-btn {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 20px 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text-muted);
}

.mood-btn:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(var(--primary-rgb), 0.15);
}

.mood-icon {
  font-size: 2rem;
}

.mood-label {
  font-size: 1rem;
}

.music-player {
  background: linear-gradient(135deg, #fef3c7 0%, #dbeafe 100%);
  padding: 32px;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}

.player-header h3 {
  margin: 0 0 8px;
  font-size: 1.7rem;
  color: var(--primary);
}

.track-info {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.waveform-container {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 16px;
  margin: 20px 0;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.05);
}

.waveform-canvas {
  width: 100%;
  height: 80px;
  border-radius: 8px;
}

.player-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.btn-control {
  background: var(--primary);
  color: white;
  border: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-control:hover {
  background: var(--primary);
  transform: scale(1.1);
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

#volumeSlider {
  width: 100px;
  accent-color: var(--primary);
}

/* Cholesterol Risk Calculator */
.lipid-tracker {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  padding: 24px;
  border-radius: 14px;
  margin: 24px 0;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.lipid-tracker h3 {
  margin: 0 0 16px;
  color: var(--error);
  font-size: 1.5rem;
}

.lipid-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
  margin: 16px 0;
}

.lipid-card {
  background: rgba(255, 255, 255, 0.8);
  border-radius: 12px;
  padding: 12px;
  box-shadow: var(--shadow-sm);
}

.lipid-card .label {
  margin: 0 0 4px;
  font-size: 0.8rem;
  color: var(--error);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.lipid-card .value {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text);
}

.lipid-card .unit {
  margin: 4px 0 0;
  font-size: 0.75rem;
  color: var(--error);
}

.history-section {
  background: var(--neutral);
  padding: 20px;
  border-radius: 12px;
  margin-top: 24px;
}

.history-section h3 {
  margin-top: 0;
  color: var(--text);
}

.history-list {
  max-height: 300px;
  overflow-y: auto;
  margin: 12px 0;
}

.history-item {
  background: var(--card-bg);
  border-radius: 8px;
  padding: 10px;
  margin-bottom: 8px;
  display: grid;
  grid-template-columns: 100px 60px 1fr;
  gap: 8px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
}

.hist-date {
  font-weight: 600;
  color: var(--primary);
}

.hist-risk {
  font-weight: 700;
}

.hist-ldl {
  color: var(--error);
}

/* Matrix Calculator */
.matrix-grid {
  display: inline-grid; gap: 10px; padding: 16px;
  border: 2px solid var(--border); border-radius: 8px; background: var(--card-bg);
}
.matrix-grid.size-2 { grid-template-columns: repeat(2, 70px); }
.matrix-grid.size-3 { grid-template-columns: repeat(3, 60px); }
.matrix-grid.size-4 { grid-template-columns: repeat(4, 55px); }

.matrix-cell {
  width: 100%; min-width: 50px; padding: 10px 6px;
  text-align: center; border: 1px solid var(--border); border-radius: 6px;
  font-size: 1.1rem; font-family: var(--font-mono);
  background: var(--input-bg);
}
.matrix-cell input {
  width: 100%; border: none; background: transparent;
  text-align: center; font: inherit; outline: none;
  padding: 0; margin: 0;
}

/* Trip Duration Calculator */
:root {
  --time: #1e40af;
  --stop: #f59e0b;
  --layover: #dc2626;
  --timezone: #7c3aed;
}

.time-bar {
  height: 30px;
  margin: 12px 0;
  border-radius: 15px;
  overflow: hidden;
  display: flex;
}

.time-fill {
  background: var(--time);
  height: 100%;
}

.time-badge {
  font-size: 2rem;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 50px;
  display: inline-block;
  margin: 16px 0;
  background: rgba(var(--primary-rgb), 0.1);
  color: var(--primary);
}

.trip-timeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.timeline-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
}

.timeline-card h4 {
  margin: 0 0 8px;
  color: var(--time);
}

.timeline-card .value {
  font-weight: 600;
  color: var(--primary);
}

/* Stopwatch */
.stopwatch-display {
  font-family: var(--font-mono);
  font-size: 3rem; font-weight: 700; text-align: center;
  margin: 1.5rem 0; color: var(--text);
}
.stopwatch-controls {
  display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap;
}
.stopwatch-controls .btn {
  min-width: 100px;
}
.lap-list {
  margin-top: 1.5rem; max-height: 300px; overflow-y: auto;
  background: var(--neutral); border-radius: 6px; padding: 0.5rem;
}
.lap-item {
  display: flex; justify-content: space-between; padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border); font-family: var(--font-mono);
}
.lap-item:last-child { border-bottom: none; }
.lap-number { font-weight: 600; color: var(--text-muted); }
.lap-time { font-weight: 700; }
.lap-diff { font-size: 0.9rem; color: var(--success); }
.result-box {
  background: var(--neutral); padding: 1.5rem; border-radius: 8px; margin-top: 1rem;
  text-align: center;
}

/* Product Shelf Life Calculator */
.result-box .icon { font-size: 2.8rem; margin-bottom: 0.5rem; color: var(--accent); }
.big-number {
  font-size: 1.8rem; font-weight: 700; color: var(--accent); margin: 0;
}
.date-warning { color: var(--error); font-weight: 600; }
.date-safe { color: var(--success); font-weight: 600; }
.shelf-table {
  width: 100%; border-collapse: collapse; margin: 1.5rem 0;
}
.shelf-table th,
.shelf-table td {
  border: 1px solid var(--border); padding: 0.75rem; text-align: center;
}
.shelf-table th {
  background: var(--neutral); font-weight: 600;
}

/* Return on Investment Calculator */
.roi-positive { color: var(--success); }
.roi-negative { color: var(--error); }
.roi-table {
  width: 100%; border-collapse: collapse; margin: 1.5rem 0;
}
.roi-table th,
.roi-table td {
  border: 1px solid var(--border); padding: 0.75rem; text-align: center;
}
.roi-table th {
  background: var(--neutral); font-weight: 600;
}

/* ----------------------------------------------------------------------
   14. Responsive Design
---------------------------------------------------------------------- */
@media (max-width: 1200px) {
  .three-column-layout {
    grid-template-columns: 200px 1fr 250px;
  }
}

@media (max-width: 992px) {
  .three-column-layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  .sidebar.left-column {
    display: none;
  }
  .right-column {
    position: static;
    order: -1;
    text-align: center;
  }
  .ad-placeholder.right-ad {
    height: 250px;
    max-width: 100%;
    margin: var(--spacing-md) auto;
  }
  .main-content-area {
    padding: var(--spacing-sm);
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--card-bg);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 999;
  }

  .nav-links.active {
    transform: translateX(0);
  }

  .nav-links a {
    width: 100%;
    text-align: center;
    padding: clamp(0.75rem, 3vw, 1rem);
    min-height: 48px;
  }

  .menu-btn {
    display: block;
  }

  .theme-toggle {
    width: clamp(32px, 5vw, 36px);
    height: clamp(18px, 3vw, 20px);
    font-size: clamp(11px, 1.5vw, 12px);
  }

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

  .hero {
    padding: clamp(1.5rem, 4vw, 2rem) clamp(0.5rem, 2vw, 1rem);
  }

  .newsletter-section {
    padding: clamp(1.5rem, 4vw, 2rem) clamp(0.5rem, 2vw, 1rem);
  }

  .newsletter-form .form-group {
    width: 100%;
  }

  .newsletter-form button {
    width: 100%;
    max-width: clamp(140px, 40vw, 180px);
  }

  .page-content-wrapper {
    padding: 0 var(--spacing-sm);
  }

  /* Mobile adjustments for calculators */
  .faces-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .timer-display {
    font-size: 3.5rem;
  }
  
  .progress-ring {
    width: 160px;
    height: 160px;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stat-value {
    font-size: 1.8rem;
  }
  
  .lipid-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .history-item {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .mood-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .player-controls {
    flex-direction: column;
  }
  
  #volumeSlider {
    width: 80px;
  }
  
  .urine-swatch {
    width: 50px;
    height: 70px;
  }
  
  .checkbox-grid {
    grid-template-columns: 1fr;
  }
  
  .input-grid, .results-grid {
    grid-template-columns: 1fr;
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .newsletter-form input {
    padding: clamp(0.4rem, 1.5vw, 0.5rem) calc(clamp(0.5rem, 1.5vw, 0.75rem) + 1.5rem) clamp(0.4rem, 1.5vw, 0.5rem) clamp(0.5rem, 1.5vw, 0.75rem);
  }

  .newsletter-form button {
    padding: clamp(0.4rem, 1.5vw, 0.5rem) clamp(0.75rem, 3vw, 1rem);
    max-width: clamp(120px, 35vw, 160px);
  }

  .footer-social a {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
  }
  
  .large-input {
    font-size: 1.75rem;
    padding: 0.75rem;
  }
  
  .stress-score, .happiness-score {
    font-size: 2rem;
  }
  
  .calculator-form {
    grid-template-columns: 1fr;
  }
}

/* ----------------------------------------------------------------------
   15. Accessibility
---------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *, *:before, *:after {
    animation: none !important;
    transition: none !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --primary: #0000FF;
    --accent: #FFA500;
    --text: #000000;
    --bg: #FFFFFF;
    --border: #000000;
  }
  
  .dark {
    --primary: #87CEEB;
    --accent: #FFD700;
    --text: #FFFFFF;
    --bg: #000000;
    --border: #FFFFFF;
  }
}

/* Print styles */
@media print {
  .navbar, .footer, .ad-placeholder, .theme-toggle, .menu-btn {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
    font-size: 12pt;
  }
  
  .container {
    max-width: 100%;
    margin: 0;
    padding: 0;
  }
  
  a {
    color: black !important;
    text-decoration: underline;
  }
}