/*
 * NutraVerse Main Theme Stylesheet
 * Mimics exact ConsumerHealthDigest layout, typography, and styling
 */

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--nv-font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--nv-text);
  background-color: #ffffff;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--nv-blue-dark);
  text-decoration: underline;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--nv-font-heading);
  color: #1a202c;
  line-height: 1.3;
  margin-top: 1.4em;
  margin-bottom: 0.6em;
  font-weight: 700;
}

p {
  margin-top: 0;
  margin-bottom: 1.25em;
}

.nv-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nv-container-wide {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 20px;
}

.clear {
  clear: both;
}

/* ==========================================================================
   Top Trust Bar
   ========================================================================== */
.nv-topbar {
  background-color: #f1f5f9;
  border-bottom: 1px solid #e2e8f0;
  font-size: 13px;
  padding: 6px 0;
  color: #475569;
}

.nv-topbar-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.nv-topbar-badge {
  background-color: var(--nv-blue);
  color: #ffffff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 3px;
  text-transform: uppercase;
  margin-right: 8px;
  letter-spacing: 0.5px;
}

.nv-topbar-right a {
  color: #475569;
}

.nv-topbar-right a:hover {
  color: var(--nv-blue);
}

.nv-sep {
  margin: 0 8px;
  color: #cbd5e1;
}

/* ==========================================================================
   Header & Main Navigation
   ========================================================================== */
.nv-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--nv-shadow-sm);
  transition: all 0.3s ease;
}

.nv-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nv-site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #0f172a;
  font-family: var(--nv-font-heading);
  font-size: 26px;
  font-weight: 700;
}

.nv-logo-icon {
  color: var(--nv-blue);
}

.nv-site-logo strong {
  color: var(--nv-blue);
}

.nv-nav {
  display: flex;
  align-items: center;
}

.nv-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 24px;
}

.nv-menu > li {
  position: relative;
}

.nv-menu > li > a {
  color: #1e293b;
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 24px 0;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}

.nv-menu > li:hover > a {
  color: var(--nv-blue);
}

.nv-arrow {
  font-size: 10px;
}

/* Mega Menu Dropdown */
.nv-mega-dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background-color: #ffffff;
  box-shadow: var(--nv-shadow-md);
  border: 1px solid #e2e8f0;
  border-radius: var(--nv-radius-md);
  padding: 25px 30px;
  min-width: 480px;
  display: none;
  z-index: 1100;
}

.nv-menu > li:hover .nv-mega-dropdown {
  display: block;
}

.nv-mega-sub-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
}

.nv-mega-sub-menu li a {
  color: #334155;
  font-size: 14px;
  font-weight: 500;
  display: block;
  padding: 4px 0;
}

.nv-mega-sub-menu li a:hover {
  color: var(--nv-blue);
  text-decoration: underline;
}

/* Header Actions */
.nv-header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.nv-search-toggle, .nv-mobile-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: #334155;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--nv-radius-sm);
}

.nv-search-toggle:hover, .nv-mobile-toggle:hover {
  color: var(--nv-blue);
  background-color: #f1f5f9;
}

.nv-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
}

.nv-bar {
  width: 22px;
  height: 2px;
  background-color: currentColor;
  transition: all 0.2s ease;
}

/* Search Drawer Overlay */
.nv-search-drawer {
  background-color: #0f172a;
  padding: 15px 0;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  box-shadow: var(--nv-shadow-md);
}

.nv-search-form-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nv-search-field {
  flex: 1;
  padding: 10px 16px;
  font-size: 16px;
  border: 1px solid #334155;
  border-radius: var(--nv-radius-sm);
  background: #1e293b;
  color: #ffffff;
}

.nv-search-field::placeholder {
  color: #94a3b8;
}

.nv-search-submit {
  background-color: var(--nv-blue);
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  font-weight: 600;
  border-radius: var(--nv-radius-sm);
  cursor: pointer;
}

.nv-search-close {
  background: none;
  border: none;
  color: #94a3b8;
  font-size: 26px;
  cursor: pointer;
  padding: 0 10px;
}

/* ==========================================================================
   Breadcrumbs
   ========================================================================== */
.nv-breadcrumbs {
  padding: 12px 0;
  background-color: #ffffff;
  font-size: 13px;
  color: #64748b;
  border-bottom: 1px solid #f1f5f9;
}

.nv-crumb-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.nv-crumb-item a {
  color: #64748b;
}

.nv-crumb-item a:hover {
  color: var(--nv-blue);
}

.nv-crumb-sep {
  margin-left: 6px;
  color: #cbd5e1;
}

.nv-crumb-item.is-active span {
  color: #0f172a;
  font-weight: 500;
}

/* ==========================================================================
   Review Headbox & Byline (CHD Mimic)
   ========================================================================== */
.nv-headbox {
  background: #f8fafc;
  padding: 30px 0 20px;
  border-bottom: 1px solid #e2e8f0;
}

.nv-post-heading, .post-heading {
  font-size: 34px;
  line-height: 1.25;
  color: #0f172a;
  margin: 0 0 12px;
}

.nv-title-content, .Title-content {
  font-size: 18px;
  line-height: 1.5;
  color: #475569;
  margin: 0;
  max-width: 900px;
}

/* Byline Strip */
.nv-byline-strip {
  background-color: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  padding: 18px 0;
}

.nv-byline-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.nv-byline-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nv-byline-avatar img {
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid #e2e8f0;
}

.nv-byline-meta {
  font-size: 14px;
  line-height: 1.4;
}

.nv-meta-line {
  margin: 0 0 4px;
  color: #475569;
}

.nv-meta-line strong {
  color: #1e293b;
}

.nv-byline-badges {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.nv-badge-fact {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  background-color: #f1f5f9;
  color: var(--nv-blue);
  font-size: 13px;
  font-weight: 600;
  border: 1px solid #e2e8f0;
}

.nv-check-icon {
  color: var(--nv-green);
  font-weight: 700;
}

/* Editorial Disclosure Bar */
.nv-disclosure-bar {
  background-color: #fafafa;
  border-bottom: 1px solid #e2e8f0;
  padding: 10px 0;
  font-size: 13px;
  color: #64748b;
}

.nv-disclosure-inner {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nv-disclosure-icon {
  color: var(--nv-blue);
  display: flex;
  align-items: center;
}

.nv-disclosure-inner p {
  margin: 0;
}

/* ==========================================================================
   2-Column Review Layout (Sticky TOC + Review Article)
   ========================================================================== */
.nv-main-content-wrap {
  padding: 35px 0 60px;
  background-color: #ffffff;
}

.nv-review-layout {
  display: flex;
  align-items: flex-start;
  gap: 40px;
}

.nv-review-sidebar {
  width: 270px;
  flex-shrink: 0;
  position: sticky;
  top: 90px;
}

.nv-review-article {
  flex: 1;
  min-width: 0;
}

/* Entry Content Typography */
.nv-entry-content {
  font-size: 18px;
  line-height: 1.7;
  color: #2d3748;
}

.nv-entry-content h2 {
  font-size: 26px;
  line-height: 1.35;
  color: #0f172a;
  border-bottom: 2px solid #f1f5f9;
  padding-bottom: 8px;
  margin-top: 1.8em;
  margin-bottom: 0.8em;
}

.nv-entry-content h3 {
  font-size: 21px;
  color: #1e293b;
  margin-top: 1.4em;
  margin-bottom: 0.5em;
}

.nv-entry-content ul, .nv-entry-content ol {
  padding-left: 24px;
  margin-bottom: 1.4em;
}

.nv-entry-content li {
  margin-bottom: 8px;
}

.nv-entry-content blockquote {
  margin: 25px 0;
  padding: 16px 22px;
  border-left: 4px solid var(--nv-blue);
  background-color: var(--nv-blue-light);
  font-style: italic;
  color: #334155;
  border-radius: 0 var(--nv-radius-md) var(--nv-radius-md) 0;
}

.nv-entry-content blockquote p {
  margin: 0;
}

/* Highlighted "READ ALSO" Callout Box */
.nv-highlighted, .highlighted {
  margin: 25px 0;
  padding: 14px 18px;
  background-color: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-left: 4px solid var(--nv-green);
  border-radius: var(--nv-radius-sm);
  font-size: 16px;
}

.nv-highlighted strong, .highlighted strong {
  color: var(--nv-green-dark);
  text-transform: uppercase;
  margin-right: 6px;
}

/* Star Ratings */
.nv-star-rating {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  color: var(--nv-orange);
  font-size: 18px;
}

.nv-star-number {
  font-size: 14px;
  font-weight: 700;
  color: #1e293b;
  margin-left: 4px;
}

/* ==========================================================================
   Card Grids & Health Topics
   ========================================================================== */
.nv-section {
  padding: 60px 0;
}

.nv-bg-soft {
  background-color: var(--nv-bg-soft);
}

.nv-section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 40px;
}

.nv-section-header h2 {
  font-size: 32px;
  margin: 0 0 10px;
  color: #0f172a;
}

.nv-section-header p {
  font-size: 17px;
  color: #64748b;
  margin: 0;
}

.nv-reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.nv-card {
  background-color: #ffffff;
  border-radius: var(--nv-radius-md);
  border: 1px solid #e2e8f0;
  overflow: hidden;
  box-shadow: var(--nv-shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
}

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

.nv-card-thumb {
  position: relative;
  background-color: #f8fafc;
  aspect-ratio: 16/10;
  overflow: hidden;
}

.nv-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.nv-card:hover .nv-card-thumb img {
  transform: scale(1.04);
}

.nv-card-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0c7ac5 0%, #0061bd 100%);
  color: #ffffff;
  padding: 20px;
  text-align: center;
  font-family: var(--nv-font-heading);
}

.nv-card-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(15, 23, 42, 0.85);
  color: #ffd801;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  backdrop-filter: blur(4px);
}

.nv-card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.nv-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  margin-bottom: 8px;
}

.nv-card-cat {
  color: var(--nv-blue);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nv-card-date {
  color: #94a3b8;
}

.nv-card-title {
  font-size: 19px;
  line-height: 1.35;
  margin: 0 0 10px;
}

.nv-card-title a {
  color: #0f172a;
}

.nv-card-title a:hover {
  color: var(--nv-blue);
}

.nv-card-excerpt {
  font-size: 14px;
  color: #64748b;
  line-height: 1.5;
  margin-bottom: 16px;
  flex: 1;
}

.nv-card-footer {
  border-top: 1px solid #f1f5f9;
  padding-top: 14px;
}

.nv-read-more {
  font-size: 14px;
  font-weight: 600;
  color: var(--nv-blue);
}

/* Health Topics Tiles */
.nv-topics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.nv-topic-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--nv-radius-md);
  padding: 24px;
  text-align: center;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--nv-shadow-sm);
}

.nv-topic-card:hover {
  border-color: var(--nv-blue);
  transform: translateY(-3px);
  box-shadow: var(--nv-shadow-md);
  text-decoration: none;
}

.nv-topic-icon {
  font-size: 38px;
  margin-bottom: 12px;
}

.nv-topic-name {
  font-size: 18px;
  margin: 0 0 6px;
  color: #0f172a;
}

.nv-topic-count {
  font-size: 13px;
  color: #64748b;
  font-weight: 500;
}

/* ==========================================================================
   Home Hero Section
   ========================================================================== */
.nv-home-hero {
  background: linear-gradient(135deg, #091e3a 0%, #0d3b66 100%);
  color: #ffffff;
  padding: 80px 0 70px;
  text-align: center;
}

.nv-hero-content {
  max-width: 860px;
  margin: 0 auto;
}

.nv-hero-tag {
  background-color: rgba(129, 200, 0, 0.2);
  color: #a3e635;
  border: 1px solid #81c800;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 18px;
}

.nv-hero-title {
  color: #ffffff;
  font-size: 44px;
  line-height: 1.2;
  margin: 0 0 16px;
}

.nv-hero-sub {
  font-size: 19px;
  line-height: 1.6;
  color: #cbd5e1;
  margin-bottom: 30px;
}

.nv-hero-search form {
  display: flex;
  max-width: 620px;
  margin: 0 auto 40px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.25);
  border-radius: var(--nv-radius-md);
  overflow: hidden;
}

.nv-hero-search input {
  flex: 1;
  padding: 16px 22px;
  font-size: 16px;
  border: none;
  outline: none;
}

.nv-hero-search button {
  background-color: var(--nv-green);
  color: #0f172a;
  border: none;
  font-weight: 700;
  font-size: 16px;
  padding: 0 28px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.nv-hero-search button:hover {
  background-color: #92d800;
}

.nv-hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.nv-stat-box strong {
  display: block;
  font-size: 28px;
  font-family: var(--nv-font-heading);
  color: #ffffff;
}

.nv-stat-box span {
  font-size: 13px;
  color: #94a3b8;
}

/* ==========================================================================
   Medical Experts Grid
   ========================================================================== */
.nv-experts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.nv-expert-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--nv-radius-md);
  padding: 26px 20px;
  text-align: center;
  box-shadow: var(--nv-shadow-sm);
}

.nv-expert-avatar img {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  margin: 0 auto 16px;
  object-fit: cover;
  border: 3px solid #e2e8f0;
}

.nv-expert-name {
  font-size: 18px;
  margin: 0 0 4px;
}

.nv-expert-name a {
  color: #0f172a;
}

.nv-expert-title {
  color: var(--nv-blue);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}

.nv-expert-bio {
  font-size: 13px;
  color: #64748b;
  line-height: 1.5;
  margin-bottom: 14px;
}

.nv-expert-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--nv-blue);
}

/* Methodology / Process Grid */
.nv-process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.nv-process-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--nv-radius-md);
  padding: 28px 22px;
  position: relative;
  box-shadow: var(--nv-shadow-sm);
}

.nv-process-num {
  font-size: 32px;
  font-weight: 800;
  color: #e2e8f0;
  display: block;
  margin-bottom: 10px;
}

.nv-process-card h3 {
  font-size: 19px;
  margin: 0 0 10px;
  color: #0f172a;
}

.nv-process-card p {
  font-size: 14px;
  color: #64748b;
  margin: 0;
  line-height: 1.6;
}

/* ==========================================================================
   Newsletter Band & Footer
   ========================================================================== */
.nv-newsletter-band {
  background-color: #0f172a;
  color: #ffffff;
  padding: 45px 0;
}

.nv-newsletter-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.nv-newsletter-info {
  max-width: 550px;
}

.nv-news-title {
  color: #ffffff;
  font-size: 24px;
  margin: 0 0 8px;
}

.nv-newsletter-info p {
  margin: 0;
  color: #94a3b8;
  font-size: 15px;
}

.nv-newsletter-form-col {
  flex: 1;
  max-width: 480px;
}

.nv-newsletter-form {
  display: flex;
  gap: 10px;
  margin-bottom: 6px;
}

.nv-input-email {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--nv-radius-sm);
  border: 1px solid #334155;
  background: #1e293b;
  color: #ffffff;
  font-size: 15px;
}

.nv-btn-subscribe {
  background-color: var(--nv-green);
  color: #0f172a;
  font-weight: 700;
  border: none;
  border-radius: var(--nv-radius-sm);
  padding: 0 20px;
  cursor: pointer;
  transition: background 0.2s;
}

.nv-btn-subscribe:hover {
  background-color: #92d800;
}

.nv-news-privacy {
  font-size: 12px;
  color: #64748b;
}

/* Main Footer */
.nv-footer {
  background-color: #ffffff;
  border-top: 1px solid #e2e8f0;
  padding: 60px 0 25px;
  font-size: 14px;
  color: #475569;
}

.nv-footer-columns {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

.nv-footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--nv-font-heading);
  font-size: 22px;
  color: #0f172a;
  margin-bottom: 14px;
}

.nv-footer-logo strong {
  color: var(--nv-blue);
}

.nv-footer-desc {
  font-size: 14px;
  line-height: 1.6;
  color: #64748b;
  margin-bottom: 20px;
}

.nv-footer-contact p {
  margin: 0 0 6px;
  font-size: 13px;
}

.nv-footer-heading {
  font-size: 16px;
  font-family: var(--nv-font-body);
  font-weight: 700;
  text-transform: uppercase;
  color: #0f172a;
  margin: 0 0 18px;
  letter-spacing: 0.5px;
}

.nv-footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nv-footer-links li {
  margin-bottom: 10px;
}

.nv-footer-links a {
  color: #475569;
  font-size: 14px;
}

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

.nv-trust-badges {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.nv-trust-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.nv-trust-icon {
  background-color: var(--nv-green-light);
  color: var(--nv-green-dark);
  font-weight: 700;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
  margin-top: 2px;
}

.nv-trust-item strong {
  display: block;
  font-size: 13px;
  color: #0f172a;
}

.nv-trust-item span {
  font-size: 12px;
  color: #64748b;
}

.nv-footer-disclaimer {
  padding: 20px 0;
  border-top: 1px solid #e2e8f0;
  border-bottom: 1px solid #e2e8f0;
  font-size: 12px;
  line-height: 1.6;
  color: #64748b;
  margin-bottom: 25px;
}

.nv-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 15px;
  font-size: 13px;
}

.nv-copyright {
  margin: 0;
}

.nv-legal-links a {
  color: #64748b;
}

.nv-legal-links a:hover {
  color: var(--nv-blue);
}

.nv-legal-links span {
  margin: 0 8px;
  color: #cbd5e1;
}

/* Medical Disclaimer Card */
.nv-medical-disclaimer-box {
  margin: 40px 0 20px;
}

.nv-disclaimer-card {
  background-color: #fffbeb;
  border: 1px solid #fef3c7;
  border-left: 4px solid #f59e0b;
  padding: 16px 20px;
  border-radius: var(--nv-radius-sm);
}

.nv-disclaimer-card h4 {
  font-size: 15px;
  color: #b45309;
  margin: 0 0 6px;
}

.nv-disclaimer-card p {
  font-size: 13px;
  line-height: 1.5;
  color: #92400e;
  margin: 0;
}

/* Back to Top Button */
#nv-back-to-top {
  position: fixed;
  bottom: 25px;
  right: 25px;
  width: 44px;
  height: 44px;
  background-color: var(--nv-blue);
  color: #ffffff;
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  box-shadow: var(--nv-shadow-md);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: background-color 0.2s, transform 0.2s;
}

#nv-back-to-top:hover {
  background-color: var(--nv-blue-dark);
  transform: translateY(-2px);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media screen and (max-width: 1024px) {
  .nv-topics-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .nv-reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nv-experts-grid, .nv-process-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nv-footer-columns {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media screen and (max-width: 768px) {
  .nv-nav {
    display: none;
  }
  .nv-mobile-toggle {
    display: flex;
  }
  .nv-topbar-flex {
    justify-content: center;
    text-align: center;
  }
  .nv-hero-title {
    font-size: 30px;
  }
  .nv-hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .nv-topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .nv-reviews-grid {
    grid-template-columns: 1fr;
  }
  .nv-experts-grid, .nv-process-grid {
    grid-template-columns: 1fr;
  }
  .nv-review-layout {
    flex-direction: column;
  }
  .nv-review-sidebar {
    width: 100%;
    position: static;
  }
  .nv-footer-columns {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .nv-footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}