/* ==========================================================================
   一元机场 (yiyuanjic.my) - Clean SaaS & Micro-Pay Console Theme
   Design Style: Modern Micro-Pay Cloud Console (#F8FAFC base, #00D2FF Neon Blue)
   ========================================================================== */

:root {
  --bg-main: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --bg-console: #0F172A;
  --bg-console-card: #1E293B;
  
  --primary-cyan: #00D2FF;
  --primary-blue: #0284C7;
  --primary-deep: #0369A1;
  --accent-neon: #00E5FF;
  --accent-green: #10B981;
  --accent-amber: #F59E0B;

  --border-light: #E2E8F0;
  --border-hover: #CBD5E1;
  --border-glow: rgba(0, 210, 255, 0.4);

  --text-main: #0F172A;
  --text-muted: #475569;
  --text-light: #64748B;
  --text-console: #E2E8F0;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.1), 0 4px 12px -2px rgba(0, 210, 255, 0.15);
  --shadow-glow: 0 0 20px rgba(0, 210, 255, 0.25);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Background Grid Pattern */
.grid-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(to right, rgba(226, 232, 240, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(226, 232, 240, 0.6) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(circle at 50% 30%, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0) 80%);
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-badge {
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  box-shadow: 0 0 10px rgba(0, 210, 255, 0.4);
}

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

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Console CTA Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #0284C7 0%, #00D2FF 100%);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm), 0 0 15px rgba(0, 210, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md), 0 0 25px rgba(0, 210, 255, 0.4);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-light);
}

.btn-secondary:hover {
  border-color: var(--primary-cyan);
  color: var(--primary-blue);
  background: #F0F9FF;
}

.btn-console {
  background: var(--bg-console);
  color: var(--primary-cyan);
  border: 1px solid var(--border-glow);
  font-family: var(--font-mono);
}

.btn-console:hover {
  background: #1E293B;
  box-shadow: var(--shadow-glow);
}

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

/* Hero Console Section */
.hero-section {
  padding: 4rem 0 5rem;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 3rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: #E0F2FE;
  border: 1px solid #BAE6FD;
  border-radius: 999px;
  color: var(--primary-blue);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.25rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.hero-title span.text-gradient {
  background: linear-gradient(135deg, #0284C7 0%, #00D2FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-mono);
}

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

/* Micro-Pay Console UI Card (Hero Right Side) */
.console-card {
  background: var(--bg-console);
  border: 1px solid #334155;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.3), 0 0 30px rgba(0, 210, 255, 0.15);
  color: var(--text-console);
}

.console-header {
  background: #1E293B;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #334155;
}

.console-dots {
  display: flex;
  gap: 0.4rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #EF4444; }
.dot-yellow { background: #F59E0B; }
.dot-green { background: #10B981; }

.console-title-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #94A3B8;
}

.console-body {
  padding: 1.5rem;
}

.console-status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #0F172A;
  border: 1px solid #334155;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.ping-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary-cyan);
}

.ping-tag.fast { color: #34D399; }

/* Dynamic Micro-Pay Interactive Calculator Slider */
.micro-slider-box {
  background: #1E293B;
  border: 1px solid #334155;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.slider-title {
  font-size: 0.9rem;
  color: #94A3B8;
  font-weight: 600;
}

.slider-price-display {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-cyan);
}

.slider-price-display small {
  font-size: 0.9rem;
  color: #94A3B8;
}

input[type=range].console-slider {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 8px;
  background: #334155;
  border-radius: 4px;
  outline: none;
  margin: 1rem 0;
}

input[type=range].console-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--primary-cyan);
  cursor: pointer;
  box-shadow: 0 0 12px var(--primary-cyan);
  transition: transform 0.1s;
}

input[type=range].console-slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider-spec-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}

.spec-mini-card {
  background: #0F172A;
  padding: 0.6rem;
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid #334155;
}

.spec-mini-val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: #F8FAFC;
}

.spec-mini-lbl {
  font-size: 0.75rem;
  color: #64748B;
}

/* Feature Grid Section */
.section {
  padding: 5rem 0;
}

.section-alt {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--primary-blue);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  background: #F0F9FF;
  border: 1px solid #BAE6FD;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Clean SaaS Cards Grid */
.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cards-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.saas-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.saas-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-cyan);
  box-shadow: var(--shadow-md), 0 0 20px rgba(0, 210, 255, 0.1);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: #F0F9FF;
  border: 1px solid #BAE6FD;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-blue);
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Pricing Grid (Referencing Pricing Image Blueprint) */
.pricing-container {
  max-width: 1100px;
  margin: 0 auto;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
  position: relative;
}

.pricing-card.popular {
  background: linear-gradient(180deg, #2563EB 0%, #1D4ED8 100%);
  color: #FFFFFF;
  border-color: #3B82F6;
  box-shadow: 0 16px 36px -4px rgba(37, 99, 235, 0.35);
  transform: scale(1.04);
}

.pricing-badge {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(4px);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.4);
}

.pricing-badge-normal {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--border-light);
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 1.25rem;
}

.plan-price {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--font-mono);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.plan-period {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 1.75rem;
}

.pricing-card.popular .plan-period {
  color: #93C5FD;
}

.plan-features {
  list-style: none;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
}

.pricing-card.popular .plan-feature-item {
  color: #EFF6FF;
}

.feature-check {
  color: var(--primary-blue);
  font-weight: bold;
}

.pricing-card.popular .feature-check {
  color: #60A5FA;
}

/* Tutorial Stepper Cards */
.tutorial-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.step-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  position: relative;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-cyan);
  margin-bottom: 0.75rem;
}

/* User Reviews Carousel / Grid */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.review-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-cyan), var(--primary-blue));
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.author-info h4 {
  font-size: 0.95rem;
  color: var(--text-main);
}

.author-info span {
  font-size: 0.8rem;
  color: var(--text-light);
}

/* FAQ Accordion Section */
.faq-accordion {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item.active {
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  padding: 1.25rem 1.5rem;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: none;
  border: none;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--primary-blue);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
  padding: 0 1.5rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 1000px;
  padding: 0 1.5rem 1.5rem;
}

/* Article Cards Grid */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-cyan);
  box-shadow: var(--shadow-md);
}

.article-body {
  padding: 1.5rem;
}

.article-category {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--primary-blue);
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.article-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-light);
  background: var(--bg-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-light);
}

/* Article Detail Layout */
.article-detail-container {
  max-width: 860px;
  margin: 3rem auto 5rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 3rem 2.5rem;
  box-shadow: var(--shadow-sm);
}

.article-header-meta {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-light);
}

.article-h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1rem;
  line-height: 1.3;
}

.article-meta-bar {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-light);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #334155;
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 2.25rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--bg-subtle);
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 1.5rem 0 0.75rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul, .article-content ol {
  margin: 1rem 0 1.25rem 1.5rem;
}

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

.article-cta-box {
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  border: 1px solid var(--primary-blue);
  border-radius: var(--radius-lg);
  padding: 2rem;
  color: #FFFFFF;
  margin: 3rem 0;
  text-align: center;
}

.article-faq-box {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 2px dashed var(--border-light);
}

/* Breadcrumbs */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

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

/* Footer Section */
.site-footer {
  background: var(--bg-console);
  color: var(--text-console);
  padding: 4rem 0 2rem;
  border-top: 1px solid #334155;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-brand p {
  color: #94A3B8;
  font-size: 0.9rem;
  margin-top: 1rem;
  max-width: 320px;
}

.footer-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  color: #94A3B8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--primary-cyan);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #1E293B;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: #64748B;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .cards-grid-3, .article-grid, .pricing-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tutorial-steps, .cards-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.25rem;
  }
  .cards-grid-3, .cards-grid-4, .article-grid, .pricing-grid, .reviews-grid, .tutorial-steps {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}