/* ============================================
   TULASI STORES Website — Design System
   ============================================ */

/* --- CSS Variables (Design Tokens) --- */
:root {
  /* Brand Colors — Emerald Green (matches Flutter app) */
  --color-primary: #10B981;
  --color-primary-dark: #059669;
  --color-primary-light: #34D399;
  --color-primary-50: #ECFDF5;
  --color-primary-100: #D1FAE5;
  --color-accent: #0D9488;
  --color-accent-dark: #0F766E;

  /* Neutrals */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F9FAFB;
  --color-bg-dark: #0F172A;
  --color-bg-dark-alt: #1E293B;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-text-dark: #F9FAFB;
  --color-border: #E5E7EB;

  /* Status */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Typography */
  --font-heading: 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Spacing */
  --section-padding: 5rem 0;
  --container-max: 1200px;
  --container-padding: 1.5rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);

  /* Animations */
  --anim-fast: 200ms;
  --anim-normal: 300ms;
  --anim-slow: 500ms;
}

/* --- Dark Mode --- */
[data-theme="dark"] {
  --color-bg: #0F172A;
  --color-bg-alt: #1E293B;
  --color-text: #F1F5F9;
  --color-text-light: #94A3B8;
  --color-border: #334155;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* --- Container --- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container-sm { max-width: 800px; margin: 0 auto; padding: 0 var(--container-padding); }
.container-lg { max-width: 1400px; margin: 0 auto; padding: 0 var(--container-padding); }

/* --- Section --- */
.section {
  padding: var(--section-padding);
}

.section-alt {
  padding: var(--section-padding);
  background: var(--color-bg-alt);
}

.section-dark {
  padding: var(--section-padding);
  background: var(--color-bg-dark);
  color: var(--color-text-dark);
}

.section-gradient {
  padding: var(--section-padding);
  background: linear-gradient(135deg, var(--color-primary) 0%, #059669 50%, var(--color-accent) 100%);
  color: white;
}

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

.section-dark h1, .section-dark h2, .section-dark h3,
.section-gradient h1, .section-gradient h2, .section-gradient h3 {
  color: white;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

.text-center { text-align: center; }
.text-light { color: var(--color-text-light); }

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 1rem auto 0;
  line-height: 1.7;
}

.section-dark .section-subtitle,
.section-gradient .section-subtitle {
  color: rgba(255,255,255,0.85);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--anim-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

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

.btn-white:hover {
  background: var(--color-primary-50);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}

.btn-ghost:hover {
  background: var(--color-primary-50);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-ghost-white {
  background: transparent;
  color: white;
  border-color: rgba(255,255,255,0.5);
}

.btn-ghost-white:hover {
  background: rgba(255,255,255,0.1);
  border-color: white;
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: 1.125rem;
  border-radius: var(--radius-xl);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: 0.875rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --- Badge / Pill --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 1rem;
  background: var(--color-primary-50);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-primary-100);
}

.badge-white {
  background: rgba(255,255,255,0.15);
  color: white;
  border-color: rgba(255,255,255,0.25);
}

/* --- Cards --- */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  transition: all var(--anim-normal);
}

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

.card-icon {
  width: 3.5rem;
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-50);
  color: var(--color-primary);
  border-radius: var(--radius-lg);
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.card h3 {
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* --- 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: 2rem; }
.grid-6 { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1.5rem; }

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-6 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-6 { grid-template-columns: repeat(2, 1fr); }
}

/* --- Flex Layouts --- */
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-col { display: flex; flex-direction: column; }
.gap-1 { gap: 0.5rem; } .gap-2 { gap: 1rem; } .gap-3 { gap: 1.5rem; } .gap-4 { gap: 2rem; }

/* --- Feature Block (Alternating image+text) --- */
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  padding: 3rem 0;
}
.feature-block.reverse { direction: rtl; }
.feature-block.reverse > * { direction: ltr; }

.feature-block-content h3 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}
.feature-block-content p {
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.feature-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.feature-points li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9375rem;
  color: var(--color-text-light);
}
.feature-points li::before {
  content: "✓";
  color: var(--color-success);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.1em;
}

.feature-block-image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.feature-block-image img {
  width: 100%;
  border-radius: var(--radius-xl);
}

@media (max-width: 768px) {
  .feature-block { grid-template-columns: 1fr; gap: 2rem; }
  .feature-block.reverse { direction: ltr; }
}

/* --- Stats / Trust Bar --- */
.stats-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 3rem;
}
.stat-item {
  text-align: center;
}
.stat-number {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}
.section-dark .stat-number,
.section-gradient .stat-number { color: white; }
.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}
.section-dark .stat-label,
.section-gradient .stat-label { color: rgba(255,255,255,0.7); }

/* --- Steps / How it Works --- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  counter-reset: step;
}
.step {
  text-align: center;
  position: relative;
}
.step-number {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  font-size: 1.25rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}
.step h4 { margin-bottom: 0.5rem; }
.step p { color: var(--color-text-light); font-size: 0.9375rem; }

@media (max-width: 768px) {
  .steps { grid-template-columns: 1fr; }
}

/* --- Pricing Cards --- */
.pricing-card {
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  text-align: center;
  transition: all var(--anim-normal);
  position: relative;
}
.pricing-card.featured {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-50);
  transform: scale(1.02);
}
.pricing-card .popular-badge {
  position: absolute;
  top: -0.75rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: white;
  padding: 0.25rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}
.pricing-price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--color-text);
  margin: 1.5rem 0 0.25rem;
}
.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-light);
}
.pricing-features {
  list-style: none;
  text-align: left;
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
}
.pricing-features li .check { color: var(--color-success); }
.pricing-features li .cross { color: var(--color-text-light); opacity: 0.4; }

/* --- Testimonial Cards --- */
.testimonial-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
}
.testimonial-card p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  font-style: italic;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.testimonial-avatar {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--color-primary-50);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.125rem;
}
.testimonial-name { font-weight: 600; font-size: 0.9375rem; }
.testimonial-role { font-size: 0.8125rem; color: var(--color-text-light); }

/* --- Screenshot Gallery --- */
.gallery-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}
.gallery-tab {
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--anim-fast);
  background: transparent;
  color: var(--color-text-light);
}
.gallery-tab.active,
.gallery-tab:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.gallery-item {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--anim-normal);
}
.gallery-item:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}
.gallery-item img {
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
}
.gallery-item-caption {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-align: center;
  background: var(--color-bg-alt);
}

/* --- FAQ / Accordion --- */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--color-bg);
  border: none;
  text-align: left;
  color: var(--color-text);
  transition: all var(--anim-fast);
}
.faq-question:hover { background: var(--color-bg-alt); }
.faq-question .faq-icon {
  transition: transform var(--anim-fast);
  font-size: 1.25rem;
  flex-shrink: 0;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--anim-normal);
}
.faq-item.active .faq-answer {
  max-height: 500px;
}
.faq-answer-inner {
  padding: 0 1.5rem 1.25rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- Lightbox / Modal --- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}
.lightbox.active { display: flex; }
.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--radius-lg);
}
.lightbox-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  background: none;
  border: none;
  z-index: 1001;
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--anim-normal);
}

.navbar-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.375rem;
  color: var(--color-primary);
}

.navbar-logo img {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
}

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

.navbar-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: color var(--anim-fast);
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--color-primary);
}

.navbar-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Hamburger */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.25rem;
}
.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--anim-fast);
}

/* Mobile Nav */
.navbar-mobile {
  display: none;
  position: fixed;
  top: 4rem;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg);
  z-index: 99;
  padding: 2rem;
  flex-direction: column;
  gap: 0.5rem;
}
.navbar-mobile.active { display: flex; }
.navbar-mobile a {
  display: block;
  padding: 0.75rem 0;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}
.navbar-mobile a:hover { color: var(--color-primary); }

@media (max-width: 768px) {
  .navbar-links, .navbar-cta { display: none; }
  .navbar-toggle { display: flex; }
}

/* --- Footer --- */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-dark);
  padding: 4rem 0 2rem;
}

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

.footer-brand p {
  color: #94A3B8;
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-top: 0.75rem;
  max-width: 280px;
}

.footer-col h4 {
  color: white;
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col a {
  color: #94A3B8;
  font-size: 0.875rem;
  transition: color var(--anim-fast);
}

.footer-col a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-bottom p {
  color: #64748B;
  font-size: 0.8125rem;
}

.footer-social {
  display: flex;
  gap: 1rem;
}

.footer-social a {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: #1E293B;
  color: #94A3B8;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--anim-fast);
  font-size: 1rem;
}

.footer-social a:hover {
  background: var(--color-primary);
  color: white;
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* --- Animations --- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes blob {
  0%, 100% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
  50% { border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%; }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.float { animation: float 3s ease-in-out infinite; }

/* --- Hero Section Specific --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 50%, #F0FDFA 100%);
  padding-top: 4rem;
}

.hero-content {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero h1 {
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, #059669 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-image {
  margin-top: 3rem;
  position: relative;
  z-index: 2;
}

.hero-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.3;
  animation: blob 8s ease-in-out infinite;
}

.hero-blob-1 {
  width: 400px;
  height: 400px;
  background: var(--color-primary);
  top: -100px;
  right: -100px;
}

.hero-blob-2 {
  width: 300px;
  height: 300px;
  background: var(--color-accent);
  bottom: -50px;
  left: -50px;
  animation-delay: 2s;
}

/* --- Platform Badges --- */
.platform-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-bg-dark);
  color: white;
  border-radius: var(--radius-lg);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all var(--anim-fast);
}
.platform-badge:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}
.platform-badge-icon {
  font-size: 1.25rem;
}

/* --- Scroll to Top --- */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  transition: all var(--anim-fast);
  box-shadow: var(--shadow-lg);
}
.scroll-top.visible { display: flex; }
.scroll-top:hover { background: var(--color-primary-dark); transform: translateY(-2px); }

/* --- Utilities --- */
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; } .mt-4 { margin-top: 2rem; } .mt-5 { margin-top: 3rem; }
.mb-1 { margin-bottom: 0.5rem; } .mb-2 { margin-bottom: 1rem; } .mb-3 { margin-bottom: 1.5rem; } .mb-4 { margin-bottom: 2rem; } .mb-5 { margin-bottom: 3rem; }
.py-1 { padding-top: 0.5rem; padding-bottom: 0.5rem; } .py-2 { padding-top: 1rem; padding-bottom: 1rem; }
.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; }