/* ===== GOOGLE FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Outfit:wght@300;400;500;600;700;800&display=swap');

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* Light Theme */
  --bg-primary: #f0f4f8;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-modal: #ffffff;
  --bg-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-input: #f1f5f9;
  --bg-result: #f0fdf4;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-on-gradient: #ffffff;
  --border-color: #e2e8f0;
  --border-focus: #6366f1;
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --success: #10b981;
  --success-bg: #ecfdf5;
  --warning: #f59e0b;
  --error: #ef4444;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.05);
  --shadow-glow: 0 0 40px rgba(99,102,241,0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(255,255,255,0.3);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.1);
  --category-math: #6366f1;
  --category-finance: #10b981;
  --category-health: #ef4444;
  --category-date: #f59e0b;
  --category-vehicle: #3b82f6;
  --category-realestate: #8b5cf6;
  --category-education: #ec4899;
  --category-business: #14b8a6;
  --category-loans: #f97316;
  --category-retirement: #06b6d4;
}

[data-theme="dark"] {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a1f35;
  --bg-card-hover: #232946;
  --bg-modal: #141929;
  --bg-hero: linear-gradient(135deg, #4338ca 0%, #6d28d9 100%);
  --bg-input: #1e2540;
  --bg-result: #0d2818;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #2a3050;
  --border-focus: #818cf8;
  --accent-primary: #818cf8;
  --accent-secondary: #a78bfa;
  --accent-gradient: linear-gradient(135deg, #818cf8, #a78bfa);
  --success: #34d399;
  --success-bg: #0d2818;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.3);
  --shadow-xl: 0 20px 25px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(129,140,248,0.2);
  --glass-bg: rgba(26,31,53,0.8);
  --glass-border: rgba(42,48,80,0.5);
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  min-height: 100vh;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-primary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-secondary); }

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--text-primary);
  transition: transform var(--transition-fast);
}

.logo:hover { transform: scale(1.02); }

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
  box-shadow: 0 4px 12px rgba(99,102,241,0.3);
}

.logo-text span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
  color: var(--text-primary);
}

.theme-toggle:hover {
  border-color: var(--accent-primary);
  transform: rotate(15deg) scale(1.05);
  box-shadow: var(--shadow-md);
}

.lang-select {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all var(--transition-fast);
  outline: none;
  max-width: 140px;
}

.lang-select:hover, .lang-select:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-md);
}

/* ===== HERO SECTION ===== */
.hero {
  background: var(--bg-hero);
  padding: 4rem 1.5rem 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  animation: heroPattern 60s linear infinite;
}

@keyframes heroPattern {
  0% { transform: translate(0, 0); }
  100% { transform: translate(30px, 30px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--text-on-gradient);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.hero p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,0.85);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.search-container {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 1rem 1.25rem 1rem 3rem;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  color: white;
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  transition: all var(--transition-fast);
  outline: none;
}

.search-input::placeholder { color: rgba(255,255,255,0.6); }
.search-input:focus {
  border-color: rgba(255,255,255,0.5);
  background: rgba(255,255,255,0.2);
  box-shadow: 0 0 30px rgba(255,255,255,0.1);
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  opacity: 0.7;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  color: var(--text-on-gradient);
}

.stat-number {
  font-family: 'Outfit', sans-serif;
  font-size: 2rem;
  font-weight: 800;
}

.stat-label {
  font-size: 0.85rem;
  opacity: 0.8;
}

/* ===== MAIN CONTENT ===== */
.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* ===== CATEGORY SECTION ===== */
.category-section {
  margin-bottom: 3rem;
}

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

.category-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: white;
  flex-shrink: 0;
}

.category-header h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.category-count {
  background: var(--bg-input);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ===== CALCULATOR CARDS GRID ===== */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.calc-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 1.25rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 1rem;
  position: relative;
  overflow: hidden;
}

.calc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-accent, var(--accent-gradient));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

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

.calc-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
  background: var(--bg-input);
  transition: all var(--transition-normal);
}

.calc-card:hover .calc-card-icon {
  transform: scale(1.1) rotate(-5deg);
}

.calc-card-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.15rem;
  line-height: 1.3;
}

.calc-card-info p {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.calc-card .arrow {
  margin-left: auto;
  font-size: 1rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.calc-card:hover .arrow {
  color: var(--accent-primary);
  transform: translateX(4px);
}

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-modal);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
  position: relative;
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  padding: 1.5rem 1.5rem 1rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  background: var(--bg-modal);
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-title-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.modal-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.modal-title-text h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-title-text p {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.modal-close:hover {
  background: var(--error);
  color: white;
  border-color: var(--error);
  transform: rotate(90deg);
}

.modal-body {
  padding: 1.5rem;
}

.modal-description {
  background: var(--bg-input);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-left: 3px solid var(--accent-primary);
}

/* ===== FORM ELEMENTS ===== */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.form-input, .form-select {
  width: 100%;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background: var(--bg-input);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: 'Inter', sans-serif;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus, .form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}

.form-input::placeholder { color: var(--text-muted); }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99,102,241,0.4);
}

.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 2px solid var(--border-color);
}

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

.btn-group {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn-group .btn { flex: 1; }

/* ===== RESULTS ===== */
.result-container {
  margin-top: 1.5rem;
  background: var(--bg-result);
  border-radius: var(--radius-lg);
  border: 2px solid var(--success);
  padding: 1.25rem;
  animation: resultFadeIn 0.4s ease;
}

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

.result-title {
  font-weight: 700;
  color: var(--success);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(16,185,129,0.15);
}

.result-item:last-child { border-bottom: none; }

.result-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.result-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
}

.result-highlight {
  font-size: 1.5rem;
  color: var(--accent-primary);
}

/* ===== MODAL FOOTER ===== */
.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-input);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

.modal-footer-link {
  color: var(--accent-primary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  transition: color var(--transition-fast);
}

.modal-footer-link:hover { color: var(--accent-secondary); text-decoration: underline; }

.modal-exit-btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--error);
  background: transparent;
  color: var(--error);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: 'Inter', sans-serif;
}

.modal-exit-btn:hover {
  background: var(--error);
  color: white;
}

/* ===== THANK YOU OVERLAY ===== */
.thankyou-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(12px);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.thankyou-overlay.active {
  opacity: 1;
  visibility: visible;
}

.thankyou-card {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 3rem 2.5rem;
  text-align: center;
  max-width: 420px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  transform: scale(0.8);
  transition: transform var(--transition-normal);
}

.thankyou-overlay.active .thankyou-card {
  transform: scale(1);
}

.thankyou-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  animation: thankBounce 0.6s ease;
}

@keyframes thankBounce {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}

.thankyou-card h3 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.thankyou-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.thankyou-card .btn {
  min-width: 160px;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 1.5rem 1.5rem;
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
}

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

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 0.75rem;
  line-height: 1.6;
}

.footer-col h4 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

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

.footer-col ul li { margin-bottom: 0.4rem; }

.footer-col ul li a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--accent-primary);
  text-decoration: none;
}

/* ===== SEO KEYWORDS SECTION ===== */
.seo-keywords {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.seo-keywords h2 {
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.keyword-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.keyword-tag {
  background: var(--bg-input);
  color: var(--text-secondary);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
  cursor: default;
}

.keyword-tag:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* ===== NO RESULTS ===== */
.no-results {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.no-results-icon { font-size: 3rem; margin-bottom: 1rem; }
.no-results h3 { font-size: 1.2rem; margin-bottom: 0.5rem; color: var(--text-secondary); }

/* ===== LOADING ANIMATION ===== */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2.5px solid rgba(99,102,241,0.2);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover { transform: translateY(-4px); }

/* ===== GOOGLE TRANSLATE FIX ===== */
.goog-te-banner-frame, .goog-te-ftab-frame { display: none !important; }
body { top: 0 !important; }
.skiptranslate { display: none !important; }
#google_translate_element { display: inline-block; }
#google_translate_element select {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-full);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  outline: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .header-inner { padding: 0.5rem 1rem; }
  .logo { font-size: 1.2rem; }
  .logo-icon { width: 34px; height: 34px; font-size: 1rem; }
  .hero { padding: 2.5rem 1rem 2rem; }
  .hero-stats { gap: 1.5rem; }
  .stat-number { font-size: 1.5rem; }
  .main-content { padding: 1.5rem 1rem 3rem; }
  .calc-grid { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
  .calc-card { padding: 1rem; }
  .calc-card-icon { width: 40px; height: 40px; font-size: 1.2rem; }
  .calc-card-info p { display: none; }
  .modal { max-width: 100%; border-radius: var(--radius-lg); max-height: 95vh; }
  .modal-header { padding: 1rem; }
  .modal-body { padding: 1rem; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .calc-grid { grid-template-columns: 1fr; }
  .header-actions { gap: 0.5rem; }
  .lang-select { max-width: 100px; font-size: 0.8rem; }
  .hero h1 { font-size: 1.75rem; }
  .category-header h2 { font-size: 1.2rem; }
}

/* ===== HIDDEN UTILITY ===== */
.hidden { display: none !important; }

/* Pulse animation for result values */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* Card entrance animation */
.calc-card {
  animation: cardIn 0.4s ease backwards;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

.category-section:nth-child(1) .calc-card { animation-delay: calc(var(--i, 0) * 0.03s); }
.category-section:nth-child(2) .calc-card { animation-delay: calc(var(--i, 0) * 0.03s); }
.category-section:nth-child(3) .calc-card { animation-delay: calc(var(--i, 0) * 0.03s); }