/* ==========================================================================
   ToolTutors — Simple Tech Guides for Everyone
   Pure CSS3 Stylesheet (Production Ready)
   Domain: tooltutors.online
   ========================================================================== */

/* --- 1. CSS Reset & Base Standards --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --primary: #4a5fd4;
  --primary-dark: #5c2d91;
  --gradient: linear-gradient(135deg, #4a5fd4, #5c2d91);
  --bg-page: #e8ebfc;
  --bg-nav: #f0f2ff;
  --bg-card: #f7f8ff;
  --border-color: #c9cfe8;
  --border: #c9cfe8;
  --text-heading: #0f0f2d;
  --text-body: #333333;
  --text-muted: #666666;
  --text-link: #3a4db8;
  --shadow: 0 4px 20px rgba(74, 95, 212, 0.12);

  /* Category colors */
  --cat-android-border: #4a5fd4;
  --cat-tools-border: #5c2d91;
  --cat-fix-border: #d4445c;
  --cat-apps-border: #2d91a0;
  --cat-beginner-border: #91842d;

  --cat-android-bg: #d0c4f7;
  --cat-android-color: #3d1a7a;
  --cat-tools-bg: #e2d4f7;
  --cat-tools-color: #431a7a;
  --cat-fix-bg: #f7d4dc;
  --cat-fix-color: #7a1a2e;
  --cat-apps-bg: #ccecf2;
  --cat-apps-color: #134f59;
  --cat-beginner-bg: #f4edd4;
  --cat-beginner-color: #5c5218;

  /* Fonts */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Layout */
  --container-width: 1200px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--text-body);
  background-color: var(--bg-page);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

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

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-heading);
  line-height: 1.25;
  font-weight: 700;
}

p {
  margin-bottom: 1.15rem;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* --- 2. Reading Progress Bar --- */
#reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0%;
  background: var(--gradient);
  z-index: 1000;
  transition: width 0.1s ease-out;
}

/* --- 3. Navigation Bar (NO icons anywhere) --- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #f0f2ff;
  height: 56px;
  padding: 0 40px;
  border-bottom: 1px solid #c9cfe8;
  display: flex;
  align-items: center;
  transition: box-shadow 0.25s ease;
}

.site-nav.scrolled {
  box-shadow: 0 2px 12px rgba(74, 95, 212, 0.10);
}

.nav-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-logo {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  color: #0f0f2d;
  text-decoration: none;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.logo-badge {
  background: var(--gradient);
  color: #ffffff;
  font-size: 11px;
  font-weight: 600;
  border-radius: 20px;
  padding: 2px 8px;
  letter-spacing: 0;
  line-height: 1.3;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 13px;
  color: #333333;
  font-weight: 500;
  text-decoration: none;
  position: relative;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s ease;
}

.nav-link:hover {
  color: #4a5fd4;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.btn-explore {
  background: var(--gradient);
  color: #ffffff;
  border-radius: 20px;
  padding: 6px 18px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: transform 0.15s ease, opacity 0.15s ease;
  border: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn-explore:hover {
  color: #ffffff;
  opacity: 0.92;
  transform: translateY(-1px);
}

/* Mobile Hamburger Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-heading);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* --- 4. Hero Section --- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 80px 20px 60px;
  background-image:
    linear-gradient(135deg, rgba(74, 95, 212, 0.85), rgba(92, 45, 145, 0.80)),
    url('https://images.unsplash.com/photo-1518770660439-4636190af475?w=1600&q=80');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  animation: gradientShift 8s ease infinite alternate;
}

@keyframes gradientShift {
  0% { filter: hue-rotate(0deg); }
  50% { filter: hue-rotate(15deg); }
  100% { filter: hue-rotate(0deg); }
}

/* 3 Floating Blob Shapes */
.blob {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(40px);
}

.blob-1 {
  width: 300px;
  height: 300px;
  top: 10%;
  left: 6%;
  background: rgba(255, 255, 255, 0.06);
  animation: floatSlow 10s ease-in-out infinite alternate;
}

.blob-2 {
  width: 240px;
  height: 240px;
  bottom: 12%;
  right: 6%;
  background: rgba(255, 255, 255, 0.04);
  animation: floatSlow 12s ease-in-out infinite alternate-reverse;
}

.blob-3 {
  width: 180px;
  height: 180px;
  top: 16%;
  right: 14%;
  background: rgba(255, 255, 255, 0.05);
  animation: floatSlow 8s ease-in-out infinite alternate;
}

@keyframes floatSlow {
  0% { transform: translate(0, 0); }
  100% { transform: translate(20px, -24px); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.badge-pill {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #ffffff;
  font-size: 12px;
  font-weight: 500;
  border-radius: 30px;
  padding: 6px 16px;
  margin-bottom: 22px;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: 52px;
  font-family: var(--font-heading);
  font-weight: 700;
  color: #ffffff;
  line-height: 1.18;
  margin-bottom: 18px;
}

.wavy-underline {
  text-decoration: underline;
  text-decoration-style: wavy;
  text-decoration-color: #ffffff;
  text-underline-offset: 8px;
}

.hero-subtitle {
  font-size: 17px;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
  max-width: 620px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.btn-hero-primary {
  background: #ffffff;
  border-radius: 30px;
  padding: 12px 28px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-hero-primary span {
  background: linear-gradient(135deg, #4a5fd4, #5c2d91);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.22);
}

.btn-hero-secondary {
  background: transparent;
  border: 1px solid #ffffff;
  color: #ffffff;
  border-radius: 30px;
  padding: 12px 28px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: background 0.2s ease, color 0.2s ease;
}

.btn-hero-secondary:hover {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

/* Search bar below buttons */
.search-bar-wrap {
  width: 100%;
  max-width: 480px;
  margin-top: 28px;
}

.hero-search-bar {
  background: #ffffff;
  border-radius: 30px;
  padding: 10px 10px 10px 22px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.18);
  display: flex;
  align-items: center;
  width: 100%;
}

.hero-search-bar input {
  border: none;
  outline: none;
  font-size: 14px;
  font-family: var(--font-body);
  color: #333333;
  flex: 1;
  background: transparent;
}

.hero-search-bar input::placeholder {
  color: #888888;
}

.hero-search-bar button {
  background: var(--gradient);
  color: #ffffff;
  border-radius: 24px;
  padding: 8px 20px;
  border: none;
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: opacity 0.2s ease;
  white-space: nowrap;
}

.hero-search-bar button:hover {
  opacity: 0.92;
}

/* Scroll down arrow */
.scroll-indicator {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  animation: bounceDown 2s infinite;
  opacity: 0.85;
}

@keyframes bounceDown {
  0%, 20%, 50%, 80%, 100% { transform: translate(-50%, 0); }
  40% { transform: translate(-50%, -10px); }
  60% { transform: translate(-50%, -5px); }
}

/* --- 5. Stats Bar --- */
.stats-bar {
  background: #0f0f2d;
  padding: 28px 40px;
  display: flex;
  justify-content: space-around;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  flex: 1;
  min-width: 150px;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 15%;
  height: 70%;
  width: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.stat-icon-wrap {
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-number {
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.2;
}

.stat-label {
  color: rgba(255, 255, 255, 0.6);
  font-size: 13px;
  margin-top: 4px;
}

/* --- 6. Category Section --- */
.category-section {
  background: #f8f9ff;
  padding: 60px 40px;
}

.section-header {
  text-align: center;
  margin-bottom: 36px;
}

.section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 32px;
  color: #0f0f2d;
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 15px;
  color: #666666;
}

/* Category Filter Bar */
.filter-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.filter-btn {
  background: #ffffff;
  border: 1px solid var(--border);
  color: #0f0f2d;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  border-radius: 20px;
  padding: 6px 18px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.filter-btn.active {
  background: var(--gradient);
  border-color: transparent;
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(74, 95, 212, 0.25);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
}

.category-card {
  background: #ffffff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(74, 95, 212, 0.15);
}

.category-card.active {
  transform: scale(1.02);
  box-shadow: 0 8px 24px rgba(74, 95, 212, 0.22);
  border-color: var(--primary);
}

.category-card-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 10px 10px 0 0;
}

.category-card-body {
  padding: 16px;
  background: #ffffff;
  border-bottom: 3px solid transparent;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.cat-android .category-card-body {
  border-bottom-color: var(--cat-android-border);
}
.cat-tools .category-card-body {
  border-bottom-color: var(--cat-tools-border);
}
.cat-fix .category-card-body {
  border-bottom-color: var(--cat-fix-border);
}
.cat-apps .category-card-body {
  border-bottom-color: var(--cat-apps-border);
}
.cat-beginner .category-card-body {
  border-bottom-color: var(--cat-beginner-border);
}

.category-name {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: #0f0f2d;
  margin-bottom: 4px;
}

.category-count {
  font-size: 12px;
  color: #666666;
}

/* --- 7. Featured Articles Section --- */
.featured-section {
  background: #ffffff;
  padding: 60px 40px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(74, 95, 212, 0.16);
  border-color: var(--primary);
}

.article-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 10px 10px 0 0;
}

.article-card-body {
  padding: 18px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.category-tag {
  font-size: 11px;
  font-weight: 600;
  border-radius: 12px;
  padding: 3px 10px;
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 10px;
  line-height: 1.3;
}

.tag-android {
  background-color: var(--cat-android-bg);
  color: var(--cat-android-color);
}
.tag-tools {
  background-color: var(--cat-tools-bg);
  color: var(--cat-tools-color);
}
.tag-fix {
  background-color: var(--cat-fix-bg);
  color: var(--cat-fix-color);
}
.tag-apps {
  background-color: var(--cat-apps-bg);
  color: var(--cat-apps-color);
}
.tag-beginner {
  background-color: var(--cat-beginner-bg);
  color: var(--cat-beginner-color);
}

.article-card-title {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: #0f0f2d;
  margin-bottom: 8px;
  line-height: 1.4;
}

.article-card-title a {
  color: #0f0f2d;
  text-decoration: none;
}

.article-card-title a:hover {
  color: var(--primary);
}

.article-card-excerpt {
  font-size: 13px;
  color: #666666;
  line-height: 1.5;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-card-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid #f0f2ff;
}

.read-time {
  font-size: 12px;
  color: #888888;
}

.read-more-link {
  font-size: 13px;
  font-weight: 600;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-decoration: none;
}

.read-more-link:hover {
  opacity: 0.85;
}

/* --- 8. All Articles Grid Section --- */
.all-articles-section {
  background: var(--bg-page);
  padding: 60px 40px;
}

.all-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

/* --- 9. Why ToolTutors Section --- */
.why-section {
  background: linear-gradient(135deg, #0f0f2d, #1a1a4e);
  padding: 70px 40px;
  color: #ffffff;
}

.why-section .section-title {
  color: #ffffff;
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  margin-top: 40px;
}

.why-col {
  text-align: center;
  padding: 20px;
}

.why-icon {
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.why-col-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 10px;
}

.why-col-text {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.6;
}

/* --- 10. Newsletter Section --- */
.newsletter-section {
  background: #f0f2ff;
  padding: 50px 40px;
  text-align: center;
}

.newsletter-title {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  color: #0f0f2d;
  margin-bottom: 6px;
}

.newsletter-subtitle {
  font-size: 15px;
  color: #666666;
  margin-bottom: 24px;
}

.newsletter-form {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  max-width: 540px;
  margin: 0 auto;
}

.newsletter-input {
  background: #ffffff;
  border: 1px solid #c9cfe8;
  border-radius: 30px;
  padding: 10px 20px;
  font-size: 14px;
  width: 320px;
  outline: none;
  font-family: var(--font-body);
}

.newsletter-input:focus {
  border-color: var(--primary);
}

.newsletter-btn {
  background: var(--gradient);
  color: #ffffff;
  border-radius: 30px;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  transition: opacity 0.2s ease;
}

.newsletter-btn:hover {
  opacity: 0.92;
}

.newsletter-note {
  font-size: 12px;
  color: #888888;
  margin-top: 12px;
}

/* --- 11. Footer --- */
.site-footer {
  background: #0f0f2d;
  padding: 50px 40px 24px;
  color: rgba(255, 255, 255, 0.6);
  margin-top: auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr 1.6fr;
  gap: 36px;
  margin-bottom: 36px;
}

.footer-brand .site-logo {
  color: #ffffff;
  margin-bottom: 12px;
  display: inline-flex;
}

.footer-tagline {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
  margin-bottom: 16px;
}

.social-links {
  display: flex;
  gap: 14px;
  font-size: 13px;
}

.social-links a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.15s ease;
}

.social-links a:hover {
  color: #ffffff;
}

.footer-col-title {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

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

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-about-text {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

.footer-bottom-bar {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 20px;
  margin-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}

.footer-bottom-bar a {
  color: rgba(255, 255, 255, 0.4);
  text-decoration: none;
}

.footer-bottom-bar a:hover {
  color: #ffffff;
}

/* --- 12. Article Pages 2-Column Layout (70% content + 30% sidebar) --- */
.article-hero {
  height: 400px;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 40px 20px;
  background-image:
    linear-gradient(135deg, rgba(74, 95, 212, 0.90), rgba(92, 45, 145, 0.85)),
    url('https://images.unsplash.com/photo-1518770660439-4636190af475?w=1600&q=80');
  background-size: cover;
  background-position: center;
  color: #ffffff;
  position: relative;
}

.breadcrumb-white {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}

.breadcrumb-white a {
  color: #ffffff;
  text-decoration: underline;
}

.article-hero h1 {
  font-size: 38px;
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 700;
  max-width: 860px;
  margin-bottom: 14px;
  line-height: 1.25;
}

.article-hero-meta {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

/* 2-Column Container */
.article-container {
  padding: 40px 20px 80px;
}

.article-layout {
  display: flex;
  gap: 36px;
  align-items: flex-start;
}

.article-main-content {
  flex: 0 0 70%;
  max-width: 70%;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 36px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.article-featured-img {
  width: 100%;
  max-height: 450px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 24px;
}

.article-intro {
  font-size: 16px;
  color: #333333;
  line-height: 1.75;
  margin-bottom: 24px;
}

/* Sticky Table of Contents */
.toc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 24px 0 36px;
}

.toc-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 12px;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 8px;
}

.toc-list a {
  font-size: 14px;
  color: var(--text-link);
  text-decoration: none;
  display: inline-block;
  transition: all 0.15s ease;
}

.toc-list a:hover,
.toc-list a.active {
  color: var(--primary);
  font-weight: 600;
  transform: translateX(4px);
}

/* Typography in article body */
.article-main-content h2 {
  font-size: 24px;
  color: var(--text-heading);
  margin-top: 36px;
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.article-main-content h2:first-of-type {
  margin-top: 10px;
}

.article-main-content h3 {
  font-size: 18px;
  color: var(--text-heading);
  margin-top: 24px;
  margin-bottom: 10px;
}

.article-main-content p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
  margin-bottom: 16px;
}

.article-main-content ul, .article-main-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-main-content li {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
  margin-bottom: 8px;
}

.article-main-content strong {
  color: var(--text-heading);
  font-weight: 600;
}

/* Callouts: Tip & Warning */
.tip-box {
  background: #d0c4f7;
  border-left: 4px solid #4a5fd4;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
  color: #1a1a4e;
  font-size: 14px;
  line-height: 1.6;
}

.tip-box strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
  color: #0f0f2d;
}

.warning-box {
  background: #fce4ec;
  border-left: 4px solid #d4445c;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
  color: #5c1825;
  font-size: 14px;
  line-height: 1.6;
}

.warning-box strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
  color: #8c1a3a;
}

/* Common Mistakes Section */
.mistakes-box {
  background: #fff5f5;
  border-left: 4px solid #d4445c;
  border-radius: 8px;
  padding: 16px 20px;
  margin: 24px 0;
  color: #5c1825;
  font-size: 14px;
  line-height: 1.6;
}

.mistakes-box strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
  color: #8c1a3a;
}

/* FAQ Accordion */
.faq-section {
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--bg-card);
}

.faq-question {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 16px 20px;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-heading);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-question::after {
  content: "+";
  font-size: 18px;
  font-weight: 400;
  color: var(--primary);
  margin-left: 12px;
}

.faq-item.active .faq-question::after {
  content: "−";
}

.faq-answer {
  display: none;
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--text-body);
  line-height: 1.65;
}

.faq-item.active .faq-answer {
  display: block;
}

/* Sidebar (30%) */
.article-sidebar {
  flex: 0 0 calc(30% - 36px);
  max-width: calc(30% - 36px);
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-widget {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}

.widget-title {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.sidebar-search-form {
  display: flex;
}

.sidebar-search-input {
  flex: 1;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 20px 0 0 20px;
  font-size: 13px;
  outline: none;
}

.sidebar-search-btn {
  background: var(--gradient);
  color: #ffffff;
  border: none;
  border-radius: 0 20px 20px 0;
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.sidebar-cat-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.sidebar-cat-list li {
  margin-bottom: 10px;
}

.sidebar-cat-list a {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: #333333;
  text-decoration: none;
}

.sidebar-cat-list a:hover {
  color: var(--primary);
}

.sidebar-cat-count {
  font-size: 12px;
  color: #888888;
  background: var(--bg-card);
  padding: 2px 8px;
  border-radius: 10px;
}

.popular-posts-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.popular-posts-list li {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid #f0f2ff;
}

.popular-posts-list li:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.popular-posts-list a {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-heading);
  line-height: 1.4;
  display: block;
}

.popular-posts-list a:hover {
  color: var(--primary);
}

/* Related articles section */
.related-articles {
  margin-top: 48px;
}

.related-articles h3 {
  font-size: 22px;
  color: var(--text-heading);
  margin-bottom: 24px;
}

/* --- 13. Static Pages (About, Contact, Legal) --- */
.page-hero {
  height: 400px;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 40px 20px;
  background-image:
    linear-gradient(135deg, rgba(74, 95, 212, 0.90), rgba(92, 45, 145, 0.85)),
    url('https://images.unsplash.com/photo-1518770660439-4636190af475?w=1600&q=80');
  background-size: cover;
  background-position: center;
  color: #ffffff;
}

.page-hero h1 {
  font-size: 42px;
  color: #ffffff;
  font-family: var(--font-heading);
  font-weight: 700;
  margin-bottom: 12px;
}

.page-hero-subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  max-width: 580px;
}

.static-page-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 44px;
  margin: 40px auto 60px;
  max-width: 860px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.static-page-card h2 {
  font-size: 22px;
  margin-top: 32px;
  margin-bottom: 12px;
}

.static-page-card p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-body);
  margin-bottom: 16px;
}

/* Contact Form */
.contact-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 40px;
  box-shadow: var(--shadow);
  max-width: 680px;
  margin: 40px auto 60px;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-heading);
}

.form-input, .form-textarea {
  font-family: var(--font-body);
  font-size: 14px;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  color: var(--text-body);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(74, 95, 212, 0.18);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.btn-submit {
  background: var(--gradient);
  color: #ffffff;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  border-radius: 30px;
  padding: 12px 28px;
  border: none;
  cursor: pointer;
  align-self: flex-start;
  transition: opacity 0.2s ease, transform 0.15s ease;
}

.btn-submit:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

/* --- 14. Back to Top Button --- */
#back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  color: #ffffff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(74, 95, 212, 0.3);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
  z-index: 99;
  font-size: 18px;
}

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

#back-to-top:hover {
  transform: translateY(-2px);
}

/* --- 15. Responsive Breakpoints --- */
@media (max-width: 1200px) {
  :root {
    --container-width: 960px;
  }
}

@media (max-width: 992px) {
  :root {
    --container-width: 720px;
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .why-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  .article-layout {
    flex-direction: column;
  }
  .article-main-content {
    flex: 1 1 100%;
    max-width: 100%;
  }
  .article-sidebar {
    flex: 1 1 100%;
    max-width: 100%;
    position: static;
  }
}

@media (max-width: 768px) {
  .site-nav {
    padding: 0 20px;
  }
  .mobile-toggle {
    display: flex;
  }
  .nav-right {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    width: 100%;
    background: #f0f2ff;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    align-items: flex-start;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
  }
  .nav-right.open {
    display: flex;
  }
  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 14px;
  }
  .btn-explore {
    align-self: flex-start;
  }
  .hero h1 {
    font-size: 36px;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .stats-bar {
    padding: 24px 20px;
  }
  .stat-item:not(:last-child)::after {
    display: none;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .category-section, .featured-section, .all-articles-section, .why-section, .newsletter-section, .site-footer {
    padding: 48px 20px;
  }
  .article-main-content {
    padding: 24px 18px;
  }
  .article-hero h1 {
    font-size: 28px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-bottom-bar {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 28px;
  }
  .hero-search-bar {
    padding: 6px 6px 6px 16px;
  }
  .hero-search-bar button {
    padding: 6px 14px;
    font-size: 12px;
  }
  .category-grid {
    grid-template-columns: 1fr;
  }
  .newsletter-input {
    width: 100%;
  }
}