:root {
  --bg-dark: #0c1419;
  --bg-main: #11191F;
  --bg-surface: #15222a;
  --bg-card: rgba(22, 35, 42, 0.65);
  --bg-card-hover: rgba(30, 48, 58, 0.82);
  --border-color: rgba(142, 221, 225, 0.18);
  --border-highlight: rgba(142, 221, 225, 0.38);
  --text-main: #ffffff;
  --text-pale: #DBECEB;
  --text-muted: #9bb2bc;
  --text-dim: #647b85;
  --primary: #4ee1db;
  --primary-light: #8EDDE1;
  --primary-hover: #38c8cd;
  --primary-btn-text: #0d2328;
  --accent-cyan: #8EDDE1;
  --accent-slate: #263942;
  --accent-glow: rgba(94, 227, 232, 0.35);
  --accent-gradient: linear-gradient(135deg, #70eef3 0%, #3dc6cb 100%);
  --btn-secondary-bg: rgba(22, 36, 43, 0.65);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-pill: 9999px;
  --container-width: 1280px;
  --header-height: 76px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

html {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-pale);
  line-height: 1.6;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #15222a 0%, #0c1419 65%, #080d11 100%);
  background-attachment: fixed;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -60px;
  left: 20px;
  background: var(--primary);
  color: var(--primary-btn-text);
  padding: 10px 20px;
  z-index: 9999;
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
  text-decoration: none;
}
.skip-link:focus {
  top: 15px;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Section anchors scroll margin for fixed header */
section[id], header[id], div[id] {
  scroll-margin-top: calc(var(--header-height) + 20px);
}

/* Navigation Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(14, 23, 29, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
}

.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo-img {
  height: 38px;
  width: auto;
  max-width: 175px;
  display: block;
  object-fit: contain;
}

.brand-feather-icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.nav-divider {
  display: inline-block;
  width: 1px;
  height: 22px;
  background: rgba(142, 221, 225, 0.22);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  color: var(--text-pale);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.2s ease;
  padding: 8px 0;
  opacity: 0.88;
}

.nav-link:hover, .nav-link:focus-visible {
  color: var(--accent-cyan);
  opacity: 1;
  text-shadow: 0 0 10px var(--accent-glow);
}

.nav-link.highlight {
  color: var(--accent-cyan);
  font-weight: 600;
  opacity: 1;
}

.header-actions {
  display: flex;
  align-items: center;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 24px;
  border-radius: var(--radius-pill);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent-gradient);
  color: var(--primary-btn-text);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover, .btn-primary:focus-visible {
  box-shadow: 0 6px 28px rgba(112, 238, 243, 0.65);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--btn-secondary-bg);
  color: var(--text-pale);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover, .btn-secondary:focus-visible {
  background: rgba(30, 48, 58, 0.85);
  border-color: var(--primary-light);
  color: var(--text-main);
  box-shadow: 0 4px 16px rgba(142, 221, 225, 0.25);
  transform: translateY(-2px);
}

.btn-lg {
  min-height: 48px;
  padding: 12px 34px;
  font-size: 1.05rem;
  border-radius: var(--radius-pill);
}

/* =====================================================================
   HERO SECTION: 1:1 VISUAL REPRODUCTION (Quiet Tech Obsidian + Cyan)
   Using High-Definition hero-feather-ripple-3200.webp as Background
   ===================================================================== */
.hero-section {
  position: relative;
  padding: 55px 0 50px;
  text-align: center;
  overflow: hidden;
  min-height: 520px;
  display: flex;
  align-items: center;
  background-image: url('assets/qingyu/hero-feather-ripple-3200.webp');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
}

/* Sub-page Hero Styling (Knowledge Hub, etc.) */
.hero-subpage {
  min-height: 320px;
  padding: 28px 0 32px;
  background-position: center 30%;
}

.hero-subpage .hero-content {
  margin: -35px auto 0;
}

.hero-subpage .breadcrumb-nav {
  margin-bottom: 12px;
}

.hero-subpage .hero-badge {
  margin-bottom: 14px;
}

.hero-subpage .hero-title {
  font-size: clamp(2rem, 3.6vw, 2.7rem);
  margin-bottom: 14px;
}

.hero-subpage .hero-subtitle {
  margin-bottom: 0;
  max-width: 860px;
}

/* Subtle, Slow Ripple Overlay over the water surface */
.hero-subtle-ripples {
  position: absolute;
  right: 12%;
  bottom: 18%;
  width: 320px;
  height: 110px;
  pointer-events: none;
  z-index: 1;
}

/* Interactive Full-Page Mouse Ripple Effect */
.mouse-ripple {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  border: 1.5px solid rgba(142, 221, 225, 0.7);
  box-shadow: 0 0 16px rgba(110, 239, 244, 0.4), inset 0 0 8px rgba(110, 239, 244, 0.25);
  transform: translate(-50%, -50%);
  animation: mouse-ripple-expand 1.4s cubic-bezier(0.1, 0.5, 0.2, 1) forwards;
  z-index: 9999;
}

@keyframes mouse-ripple-expand {
  0% {
    width: 12px;
    height: 6px;
    opacity: 0.9;
    border-color: #ffffff;
  }
  45% {
    opacity: 0.5;
    border-color: var(--accent-cyan);
  }
  100% {
    width: 200px;
    height: 70px;
    opacity: 0;
    border-color: rgba(78, 225, 219, 0);
  }
}

.subtle-ripple-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1.5px solid rgba(142, 221, 225, 0.45);
  box-shadow: 0 0 12px rgba(110, 239, 244, 0.25);
  opacity: 0;
  animation: subtle-ripple-spread 6s cubic-bezier(0.2, 0.5, 0.2, 1) infinite;
}

.subtle-ripple-circle:nth-child(1) { animation-delay: 0s; }
.subtle-ripple-circle:nth-child(2) { animation-delay: 2s; }
.subtle-ripple-circle:nth-child(3) { animation-delay: 4s; }

@keyframes subtle-ripple-spread {
  0% {
    width: 60px;
    height: 22px;
    opacity: 0.7;
    border-color: rgba(255, 255, 255, 0.85);
  }
  50% {
    opacity: 0.35;
    border-color: var(--accent-cyan);
  }
  100% {
    width: 320px;
    height: 100px;
    opacity: 0;
    border-color: rgba(78, 225, 219, 0);
  }
}

/* Hero Content Layer */
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 960px;
  margin: -18px auto 0;
}

/* 2026 Tech Upgrade Pill Badge */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 20px;
  background: rgba(38, 57, 66, 0.58);
  border: 1px solid rgba(142, 221, 225, 0.32);
  border-radius: var(--radius-pill);
  color: var(--accent-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.25);
}

.hero-title {
  font-size: clamp(2.1rem, 4.2vw, 3.2rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
  color: #ffffff;
  text-shadow: 0 0 30px rgba(142, 221, 225, 0.25);
}

.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--text-pale);
  max-width: 820px;
  margin: 0 auto 28px;
  line-height: 1.75;
  opacity: 0.92;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

/* 4 Feature items horizontal bar */
.hero-features-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  flex-wrap: wrap;
  color: var(--text-pale);
  font-size: 0.92rem;
  padding-top: 14px;
}

.hero-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.check-icon {
  color: var(--accent-cyan);
  font-weight: 700;
  font-size: 1.05rem;
  filter: drop-shadow(0 0 6px var(--accent-cyan));
}

/* Animations */
@keyframes feather-subtle-float {
  0%, 100% {
    transform: translateX(-35%) translateY(0px) rotate(-8deg);
  }
  50% {
    transform: translateX(-35%) translateY(-9px) rotate(-6.5deg);
  }
}

@keyframes ripple-spread {
  0% {
    width: 60px;
    height: 22px;
    opacity: 0.95;
    border-color: #ffffff;
  }
  50% {
    opacity: 0.6;
    border-color: var(--accent-cyan);
  }
  100% {
    width: 340px;
    height: 110px;
    opacity: 0;
    border-color: rgba(78, 225, 219, 0);
  }
}

@keyframes ribbon-breathe {
  0%, 100% {
    transform: translateY(0) scale(1);
    opacity: 0.85;
  }
  50% {
    transform: translateY(-8px) scale(1.02);
    opacity: 0.95;
  }
}

/* Section Common */
.section {
  padding: 70px 0;
  position: relative;
}

.section-alt {
  background: rgba(17, 25, 31, 0.45);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 46px;
}

.section-tag {
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
  display: inline-block;
}

.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.3rem);
  font-weight: 700;
  margin-bottom: 14px;
  color: #ffffff;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.02rem;
  line-height: 1.7;
}

/* =====================================================================
   CORE ADVANTAGES: 3 HORIZONTAL GLASS CARDS (Matching Reference Layout)
   ===================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  transition: all 0.28s ease;
  display: flex;
  align-items: center;
  gap: 20px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
}

.feature-card:hover {
  transform: translateY(-4px);
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.4), 0 0 20px rgba(142, 221, 225, 0.2);
}

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(38, 57, 66, 0.7);
  border: 1px solid rgba(142, 221, 225, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  flex-shrink: 0;
  box-shadow: 0 0 14px rgba(142, 221, 225, 0.15);
}

.feature-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
}

.feature-text {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

/* =====================================================================
   STREAMING & AI SUPPORT CARDS
   ===================================================================== */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.unlock-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px;
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.unlock-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-highlight);
}

.unlock-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.unlock-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(38, 57, 66, 0.7);
  border: 1px solid rgba(142, 221, 225, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  font-size: 1.3rem;
}

.unlock-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: #ffffff;
}

.unlock-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 22px;
  line-height: 1.65;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(21, 34, 42, 0.75);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--text-pale);
}

/* =====================================================================
   PRICING TABLE: CLEAN GLASS MORPHISM WITH SINGLE-LINE BUTTONS
   ===================================================================== */
.pricing-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 0 auto;
}

.pricing-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.pricing-table caption {
  font-size: 0.95rem;
  color: var(--text-muted);
  padding-bottom: 14px;
  text-align: left;
}

.pricing-table th, .pricing-table td {
  padding: 18px 20px;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table th:last-child,
.pricing-table td:last-child {
  white-space: nowrap;
  min-width: 130px;
  text-align: center;
}

.pricing-table th {
  background: rgba(21, 34, 42, 0.9);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
}

.pricing-table td {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.pricing-table tbody tr:last-child td {
  border-bottom: none;
}

.pricing-table tbody tr:hover td {
  background: rgba(142, 221, 225, 0.05);
}

.plan-name-cell {
  font-weight: 700;
  color: #ffffff !important;
}

.plan-price-num {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-cyan);
}

.popular-badge {
  background: #ef4444;
  color: #fff;
  font-size: 0.72rem;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-weight: 700;
  margin-left: 6px;
  vertical-align: middle;
}

/* =====================================================================
   TESTIMONIALS
   ===================================================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
}

.rating-stars {
  color: #38c8cd;
  margin-bottom: 14px;
  font-size: 1rem;
}

.testimonial-quote {
  font-size: 0.95rem;
  color: var(--text-pale);
  line-height: 1.65;
  margin-bottom: 20px;
  opacity: 0.9;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(38, 57, 66, 0.8);
  border: 1px solid rgba(142, 221, 225, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--accent-cyan);
  font-size: 0.95rem;
}

.author-meta h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
}

.author-meta p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* =====================================================================
   FAQ SECTION (All Open by Default)
   ===================================================================== */
.faq-list {
  max-width: 880px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  backdrop-filter: blur(12px);
  transition: border-color 0.2s ease;
}

.faq-item:hover {
  border-color: var(--border-highlight);
}

.faq-summary {
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  outline: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--accent-cyan);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-summary::after {
  transform: rotate(180deg);
}

.faq-content {
  padding: 0 24px 22px;
  color: var(--text-pale);
  font-size: 0.96rem;
  line-height: 1.7;
  border-top: 1px solid rgba(142, 221, 225, 0.08);
  padding-top: 16px;
  opacity: 0.92;
}

.faq-content a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* =====================================================================
   ARTICLE & KNOWLEDGE HUB STYLES
   ===================================================================== */
.content-wrapper {
  max-width: 860px;
  margin: 40px auto 80px;
  padding: 0 24px;
}

.breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

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

.breadcrumb-nav a:hover {
  color: var(--accent-cyan);
}

.article-header {
  margin-bottom: 36px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 24px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-dim);
  font-size: 0.88rem;
  margin-top: 14px;
}

.article-body {
  color: var(--text-pale);
  font-size: 1.05rem;
  line-height: 1.8;
}

.article-body h2 {
  font-size: 1.55rem;
  color: #ffffff;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  color: #f3f4f6;
  margin: 28px 0 12px;
}

.article-body p {
  margin-bottom: 20px;
}

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

.article-body li {
  margin-bottom: 8px;
}

.article-body a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: rgba(38, 57, 66, 0.4);
  padding: 14px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--accent-cyan);
}

.articles-hub-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-highlight);
}

.article-card-tag {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(38, 57, 66, 0.8);
  border: 1px solid rgba(142, 221, 225, 0.25);
  color: var(--accent-cyan);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 12px;
  width: fit-content;
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  line-height: 1.4;
}

.article-card-excerpt {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-card-link {
  color: var(--accent-cyan);
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* =====================================================================
   SITE FOOTER (4 links as required)
   ===================================================================== */
.site-footer {
  margin-top: auto;
  background: #090f13;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
}

.footer-nav-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-nav-link {
  color: var(--text-pale);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  transition: color 0.2s ease;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  opacity: 0.85;
}

.footer-nav-link:hover, .footer-nav-link:focus-visible {
  color: var(--accent-cyan);
  opacity: 1;
}

.footer-copy {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.88rem;
}

/* Focus styles for keyboard accessibility */
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Responsive Media Queries */
@media (max-width: 1200px) {
  .hero-section {
    background-position: 65% center;
  }
}

@media (max-width: 992px) {
  .features-grid, .testimonials-grid, .articles-hub-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .hero-subtle-ripples {
    display: none;
  }
  .hero-section {
    background-position: 70% center;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 68px;
  }
  
  .features-grid, .unlock-grid, .testimonials-grid, .articles-hub-grid {
    grid-template-columns: 1fr;
  }
  
  .main-nav, .nav-divider {
    display: none;
  }

  .site-header .header-inner {
    gap: 12px;
  }
  
  .hero-section {
    padding: 60px 0 50px;
    background-position: 74% center;
    min-height: auto;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta-group .btn {
    width: 100%;
  }
  
  .footer-nav-list {
    flex-direction: column;
    gap: 12px;
  }
  
  .pricing-table th, .pricing-table td {
    padding: 14px 12px;
    font-size: 0.88rem;
  }
  
  .hero-features-bar {
    flex-direction: column;
    gap: 12px;
    align-items: center;
  }
}