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

:root {
  --bg-primary: #030806;
  --bg-gradient: radial-gradient(circle at 50% 0%, #0b2d1e 0%, #030806 100%);
  --bg-card: rgba(8, 26, 19, 0.7);
  --bg-card-hover: rgba(12, 38, 28, 0.85);
  --color-primary: #00ff88;
  --color-primary-glow: rgba(0, 255, 136, 0.3);
  --color-secondary: #10b981;
  --color-accent: #06b6d4;
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-border: rgba(0, 255, 136, 0.12);
  --color-border-hover: rgba(0, 255, 136, 0.35);
  --max-width: 1200px;
  --font-title: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--color-text);
  font-family: var(--font-body);
}

body {
  background: var(--bg-gradient);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

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

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

/* Button & UI Accents */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.6rem;
  border-radius: 50px;
  font-weight: 600;
  font-family: var(--font-title);
  cursor: pointer;
  transition: var(--transition);
  border: none;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #030806;
  box-shadow: 0 4px 15px var(--color-primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--color-primary-glow);
  filter: brightness(1.1);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: rgba(0, 255, 136, 0.1);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-accent {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid rgba(0, 255, 136, 0.3);
}

.btn-accent:hover {
  background: rgba(0, 255, 136, 0.08);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* Layout Containers */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-badge {
  display: inline-block;
  padding: 0.3rem 1rem;
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.2);
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 30px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  font-family: var(--font-title);
}

.section-title {
  font-family: var(--font-title);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.section-title span {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-desc {
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 1rem auto 0;
  font-size: 1.05rem;
}

/* Glassmorphism Cards */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 2.25rem;
  transition: var(--transition);
}

.glass-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 255, 136, 0.05);
}

/* Header & Sticky Navbar */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(3, 8, 6, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.logo span {
  color: var(--color-primary);
  text-shadow: 0 0 12px var(--color-primary-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.nav-link:hover, .nav-link.active {
  color: var(--color-primary);
}

.nav-btn {
  font-size: 0.9rem;
  padding: 0.6rem 1.2rem;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  padding-top: 9rem;
  padding-bottom: 6rem;
  text-align: center;
  overflow: hidden;
  position: relative;
}

.hero-glow {
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 255, 136, 0.08) 0%, rgba(0, 0, 0, 0) 70%);
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  font-family: var(--font-title);
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-title span {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 30px rgba(0, 255, 136, 0.1);
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 2.5rem;
}

.hero-btns {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.hero-features {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto;
}

.hero-feature-tag {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0.4rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

.hero-feature-tag i {
  color: var(--color-primary);
}

.hero-feature-tag:hover {
  background: rgba(0, 255, 136, 0.05);
  border-color: rgba(0, 255, 136, 0.3);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* Advantages Grid */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.adv-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.adv-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 12px;
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
  font-size: 1.5rem;
}

.adv-title {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.adv-desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  flex-grow: 1;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.pricing-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
}

.pricing-card.popular {
  border-color: rgba(0, 255, 136, 0.4);
  box-shadow: 0 8px 30px rgba(0, 255, 136, 0.08);
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #030806;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.8rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-title);
}

.price-title {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.price-target {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.price-tag {
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.price-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.price-features li {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.price-features li i {
  color: var(--color-primary);
  font-size: 0.8rem;
}

.price-btn {
  width: 100%;
}

/* Tutorials Section */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.step-card {
  position: relative;
  text-align: center;
}

.step-num {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #030806;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 4px 15px var(--color-primary-glow);
}

.step-title {
  font-family: var(--font-title);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.step-desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.tutorial-links-title {
  text-align: center;
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 2rem;
}

.tutorial-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.tutorial-link-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.75rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-weight: 600;
  transition: var(--transition);
}

.tutorial-link-card:hover {
  background: rgba(0, 255, 136, 0.05);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.tutorial-link-card i {
  color: var(--color-primary);
  transition: var(--transition);
}

.tutorial-link-card:hover i {
  transform: translateX(4px);
}

/* Deep Review Section */
.review-content {
  max-width: 900px;
  margin: 0 auto;
}

.review-card {
  border-left: 4px solid var(--color-primary);
}

.review-prose {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

.review-prose p {
  margin-bottom: 1.5rem;
}

.review-prose strong {
  color: var(--color-text);
}

.review-cta-box {
  background: rgba(0, 255, 136, 0.04);
  border: 1px dashed rgba(0, 255, 136, 0.25);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.review-cta-text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.review-cta-text strong {
  color: var(--color-primary);
}

/* Articles Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.article-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.article-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.article-tag {
  color: var(--color-primary);
  font-weight: 600;
}

.article-title-link h3 {
  font-family: var(--font-title);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.75rem;
  color: var(--color-text);
  transition: var(--transition);
}

.article-title-link:hover h3 {
  color: var(--color-primary);
}

.article-summary {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-more {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
}

.article-more i {
  font-size: 0.8rem;
  transition: var(--transition);
}

.article-card:hover .article-more i {
  transform: translateX(4px);
}

/* Testimonials Section */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testi-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.testi-avatar {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: rgba(0, 255, 136, 0.08);
  border: 1px solid rgba(0, 255, 136, 0.25);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: var(--font-title);
}

.testi-name {
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.95rem;
}

.testi-title {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.testi-stars {
  color: #fbbf24;
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.testi-text {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* FAQ Accordion Section */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  margin-bottom: 0.5rem;
}

.faq-header {
  width: 100%;
  background: none;
  border: none;
  color: var(--color-text);
  padding: 1.25rem 0.5rem;
  text-align: left;
  font-family: var(--font-title);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}

.faq-header:hover {
  color: var(--color-primary);
}

.faq-icon-arrow {
  font-size: 1rem;
  color: var(--color-text-muted);
  transition: var(--transition);
}

.faq-item.active .faq-icon-arrow {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: var(--transition);
}

.faq-body-content {
  padding: 0 0.5rem 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-cta-box {
  text-align: center;
  margin-top: 3.5rem;
  padding: 2.5rem;
}

.faq-cta-box h3 {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.faq-cta-box p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

/* Keyword Cloud Section */
.tags-section {
  background: rgba(3, 8, 6, 0.4);
  padding: 4rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid rgba(255, 255, 255, 0.02);
}

.tags-wrap {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tag-btn {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-text-muted);
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  border-radius: 4px;
  transition: var(--transition);
}

.tag-btn:hover {
  background: rgba(0, 255, 136, 0.05);
  border-color: rgba(0, 255, 136, 0.25);
  color: var(--color-primary);
  transform: scale(1.03);
}

/* Footer styling */
footer {
  background: #020504;
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
}

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

.footer-brand h4 {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.footer-brand h4 span {
  color: var(--color-primary);
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.footer-links-title {
  font-family: var(--font-title);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--color-text);
  position: relative;
}

.footer-links-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.4rem;
  width: 1.5rem;
  height: 2px;
  background: var(--color-primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.75rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer-links a:hover {
  color: var(--color-primary);
  padding-left: 4px;
}

.footer-disclaimer {
  grid-column: 1 / -1;
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid rgba(255, 255, 255, 0.03);
  padding: 1.5rem;
  border-radius: 8px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.footer-disclaimer strong {
  color: var(--color-text);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* Article Reader View Styling (SPA mode) */
.article-reader-container {
  max-width: 900px;
  margin: 0 auto;
}

.article-reader-header {
  margin-bottom: 2rem;
}

.article-reader-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.article-reader-back:hover {
  transform: translateX(-4px);
}

.article-reader-title {
  font-family: var(--font-title);
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1.25rem;
}

.article-reader-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 1.25rem;
}

.article-reader-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.article-reader-meta-item i {
  color: var(--color-primary);
}

/* Article Body Content styling */
.article-reader-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #e2e8f0;
}

.article-reader-body h2 {
  font-family: var(--font-title);
  font-size: 1.6rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--color-text);
  border-bottom: 1px solid rgba(0, 255, 136, 0.1);
  padding-bottom: 0.5rem;
}

.article-reader-body h3 {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.75rem 0 0.75rem;
  color: var(--color-text);
}

.article-reader-body p {
  margin-bottom: 1.5rem;
}

.article-reader-body ul, .article-reader-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-reader-body li {
  margin-bottom: 0.5rem;
}

.article-reader-body strong {
  color: var(--color-primary);
}

.article-reader-body blockquote {
  background: rgba(0, 255, 136, 0.04);
  border-left: 4px solid var(--color-primary);
  padding: 1.25rem 1.5rem;
  border-radius: 0 12px 12px 0;
  margin: 1.5rem 0;
  color: var(--color-text-muted);
  font-style: italic;
}

.article-callout-box {
  background: linear-gradient(135deg, rgba(8, 28, 20, 0.8), rgba(4, 15, 10, 0.9));
  border: 1px solid rgba(0, 255, 136, 0.2);
  border-radius: 12px;
  padding: 2rem;
  margin: 2.5rem 0;
  text-align: center;
}

.article-callout-box h4 {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.article-callout-box p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.article-callout-box .btn {
  min-width: 200px;
}

/* Related Recommendations & Footer inside Reader */
.article-reader-related {
  margin-top: 4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2.5rem;
}

.related-title {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.related-item-card {
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid rgba(255, 255, 255, 0.04);
  padding: 1.25rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
  display: block;
}

.related-item-card:hover {
  background: rgba(0, 255, 136, 0.04);
  border-color: rgba(0, 255, 136, 0.2);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.article-reader-footer-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px dashed rgba(255, 255, 255, 0.05);
}

/* Back to top float button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: rgba(8, 28, 20, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 99;
  transition: var(--transition);
  opacity: 0;
  pointer-events: none;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-primary);
  color: #030806;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px var(--color-primary-glow);
}

/* Media Queries & Responsive Adaptations */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  header {
    background: rgba(3, 8, 6, 0.9);
  }

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    bottom: 0;
    background: #030806;
    flex-direction: column;
    padding: 3rem 1.5rem;
    gap: 2rem;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
  }

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

  .nav-btn {
    width: 100%;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-btns {
    flex-direction: column;
    align-items: center;
  }

  .hero-btns .btn {
    width: 100%;
    max-width: 320px;
  }

  .section {
    padding: 4rem 0;
  }

  .advantages-grid, .steps-grid, .articles-grid, .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 450px;
    margin: 0 auto;
  }

  .tutorial-links-grid, .related-list {
    grid-template-columns: 1fr;
  }

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

  .article-reader-title {
    font-size: 1.8rem;
  }

  .article-reader-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .article-reader-footer-actions {
    flex-direction: column;
    gap: 1.5rem;
    align-items: stretch;
  }

  .article-reader-footer-actions .btn {
    width: 100%;
  }
}