/* ============================================================
   青之脑 CYAN BRAIN — Cyber Brain Neural Theme
   Design: neural-circuit cyans, bio-electric whites,
   synapse-spark motifs on light tech background
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Background & Surfaces */
  --bg: #f4f7fc;
  --bg-card: #ffffff;
  --bg-alt: #edf2f9;
  --bg-hero-overlay: rgba(10, 14, 30, 0.55);

  /* Neural Cyan Palette */
  --cyan-primary: #00bcd4;
  --cyan-glow: #00e5ff;
  --cyan-deep: #00838f;
  --cyan-pale: #b2ebf2;

  /* Bio-Electric Accents */
  --electric-blue: #2979ff;
  --electric-violet: #7c4dff;
  --synapse-spark: #40c4ff;

  /* Text */
  --text: #1a1a2e;
  --text-soft: #5a5a7a;
  --text-muted: #8888a8;
  --text-inverse: #f0f4ff;

  /* Header */
  --header-bg: #0a0e1e;
  --header-border: #00bcd4;

  /* Semantic */
  --accent-gold: #ffc107;
  --danger-red: #ff5252;
  --success-green: #00c853;

  /* Fonts */
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Noto Serif SC', 'SimSun', 'STSong', serif;
  --font-mono: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;

  /* Spacing */
  --section-gap: 80px;
  --card-radius: 12px;
  --border-light: #dde4f0;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Bio-electric background pattern */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse at 15% 20%, rgba(0, 229, 255, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 85% 60%, rgba(124, 77, 255, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 85%, rgba(0, 188, 212, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

/* Neural circuit grid overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(0, 188, 212, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 188, 212, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
}

h1 { font-size: 2.4rem; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }

a {
  color: var(--electric-blue);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover {
  color: var(--cyan-primary);
}

p {
  margin-bottom: 1.2em;
}

strong {
  color: var(--text);
}

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

/* --- Utility Classes --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.content-list {
  list-style: disc;
  padding-left: 20px;
  margin-bottom: 1.2em;
}
.content-list-num {
  list-style: decimal;
  padding-left: 24px;
  margin-bottom: 1.2em;
}

.content-li {
  margin-bottom: 5px;
  color: var(--text-soft);
}
.content-li-sm { margin-bottom: 4px; color: var(--text-soft); }
.content-li-md { margin-bottom: 8px; color: var(--text-soft); }
.content-li-lg { margin-bottom: 10px; color: var(--text-soft); }

.strong-cyan { color: var(--cyan-deep); }
.strong-red { color: var(--danger-red); }
.strong-gold { color: var(--accent-gold); }
.strong-muted { color: var(--text-soft); }
.strong-navy { color: var(--electric-blue); }

.td-highlight {
  color: var(--cyan-deep);
  font-weight: 700;
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.chapter-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--cyan-deep);
  margin: 24px 0 8px;
  font-family: var(--font-sans);
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--cyan-pale);
  margin-top: 8px;
  letter-spacing: 0.05em;
}

.guide-intro, .route-desc {
  color: var(--text-soft);
  font-size: 1rem;
  line-height: 1.9;
}

.route-heading {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--electric-violet);
  margin: 20px 0 8px;
  font-family: var(--font-sans);
}

.sys-reqs-h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--cyan-deep);
  margin: 28px 0 12px;
}
.sys-reqs-h3:first-of-type {
  margin-top: 0;
}

.section-subheading {
  text-align: center;
  margin: 40px 0 24px;
  font-size: 1.3rem;
  color: var(--cyan-deep);
  font-family: var(--font-serif);
}

/* --- Header / Navigation --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--header-bg);
  border-bottom: 2px solid var(--header-border);
  box-shadow: 0 2px 20px rgba(0, 188, 212, 0.15);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--cyan-glow);
  text-decoration: none;
  letter-spacing: 0.04em;
}
.site-logo:hover {
  color: var(--cyan-glow);
  text-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.header-nav a {
  color: var(--text-inverse);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color 0.2s;
}
.header-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cyan-glow);
  transition: width 0.3s;
  box-shadow: 0 0 6px rgba(0, 229, 255, 0.5);
}
.header-nav a:hover::after,
.header-nav a.active::after {
  width: 100%;
}
.header-nav a:hover,
.header-nav a.active {
  color: var(--cyan-glow);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: linear-gradient(135deg, var(--cyan-primary), var(--electric-blue));
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.3s;
  box-shadow: 0 0 16px rgba(0, 188, 212, 0.3);
  letter-spacing: 0.03em;
}
.header-cta:hover {
  background: linear-gradient(135deg, var(--cyan-glow), var(--synapse-spark));
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.5);
  transform: translateY(-1px);
  color: #fff;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(170deg, #080c1a 0%, #0d1b2a 40%, #1a2744 100%);
  overflow: hidden;
}

/* Neural circuit overlay on hero */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 229, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 75% 60%, rgba(124, 77, 255, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(0, 188, 212, 0.05) 0%, transparent 40%);
  z-index: 0;
}

/* Synapse spark particles */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    radial-gradient(1px 1px at 15% 25%, rgba(0, 229, 255, 0.6), transparent),
    radial-gradient(1px 1px at 35% 45%, rgba(0, 229, 255, 0.4), transparent),
    radial-gradient(1px 1px at 55% 20%, rgba(64, 196, 255, 0.5), transparent),
    radial-gradient(1px 1px at 72% 55%, rgba(0, 229, 255, 0.3), transparent),
    radial-gradient(1px 1px at 25% 70%, rgba(124, 77, 255, 0.4), transparent),
    radial-gradient(1px 1px at 60% 75%, rgba(0, 188, 212, 0.4), transparent),
    radial-gradient(1px 1px at 85% 30%, rgba(64, 196, 255, 0.3), transparent),
    radial-gradient(1px 1px at 42% 85%, rgba(0, 229, 255, 0.3), transparent);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 60px 24px;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 12px;
  text-shadow: 0 0 40px rgba(0, 229, 255, 0.5);
  letter-spacing: 0.06em;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--cyan-pale);
  margin-bottom: 8px;
  font-weight: 400;
}

.hero-tags {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--cyan-glow);
  font-size: 0.85rem;
  border-radius: 20px;
  font-weight: 500;
  letter-spacing: 0.03em;
}

/* --- Page Hero (sub-pages) --- */
.page-hero {
  position: relative;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(170deg, #080c1a 0%, #0d1b2a 60%, #1a2744 100%);
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 30% 50%, rgba(0, 229, 255, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 70% 50%, rgba(124, 77, 255, 0.04) 0%, transparent 50%);
  z-index: 0;
}
.page-hero-content {
  position: relative;
  z-index: 1;
  padding: 40px 24px;
}

/* --- Content Section --- */
.content-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 24px;
}

.content-section h2 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
}

.content-section h3 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--cyan-deep);
  margin: 28px 0 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--cyan-pale);
}

/* --- Cards --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.card {
  background: var(--bg-card);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--cyan-primary);
  padding: 24px;
  transition: transform 0.2s, box-shadow 0.3s;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(0, 188, 212, 0.12);
}

.card h3 {
  font-size: 1.15rem;
  color: var(--cyan-deep);
  margin-bottom: 8px;
  border: none;
  padding: 0;
}

.card p {
  color: var(--text-soft);
  font-size: 0.95rem;
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  color: var(--cyan-primary);
}

/* Feature cards on index */
.feature-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 28px;
  margin: 40px 0;
}

.feature-card {
  background: var(--bg-card);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-light);
  padding: 28px 22px;
  text-align: center;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan-primary), var(--electric-violet));
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 188, 212, 0.1);
}

.feature-card-icon {
  font-size: 2.5rem;
  margin-bottom: 14px;
  display: block;
}

.feature-card h3 {
  font-size: 1.1rem;
  color: var(--text);
  margin-bottom: 8px;
  border: none;
  padding: 0;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-soft);
}

/* --- Character Cards --- */
.character-card {
  background: var(--bg-card);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--electric-violet);
  padding: 28px;
  margin-bottom: 24px;
  transition: box-shadow 0.3s;
}
.character-card:hover {
  box-shadow: 0 6px 24px rgba(124, 77, 255, 0.1);
}

.character-card h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--electric-violet);
  margin-bottom: 4px;
  border: none;
  padding: 0;
}

.character-role {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-style: italic;
}

.character-traits {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.trait-tag {
  padding: 2px 10px;
  background: rgba(124, 77, 255, 0.08);
  border: 1px solid rgba(124, 77, 255, 0.2);
  color: var(--electric-violet);
  font-size: 0.8rem;
  border-radius: 12px;
}

/* --- Screenshot Gallery --- */
.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 32px 0;
}

.screenshot-grid img {
  width: 100%;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid var(--border-light);
  transition: transform 0.3s, box-shadow 0.3s;
}
.screenshot-grid img:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 30px rgba(0, 188, 212, 0.18);
}

/* --- Lightbox --- */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(5, 8, 20, 0.95);
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.lightbox.active {
  display: flex;
}
.lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 8px;
  box-shadow: 0 0 60px rgba(0, 229, 255, 0.2);
}
.lightbox-close {
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 2rem;
  color: #fff;
  cursor: pointer;
  z-index: 1;
}

/* --- CTA Banner (index only) --- */
.cta-banner {
  background: linear-gradient(135deg, var(--header-bg), #141a35);
  border-top: 2px solid var(--cyan-glow);
  border-bottom: 2px solid var(--cyan-glow);
  padding: 48px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(0, 229, 255, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 50%, rgba(124, 77, 255, 0.04) 0%, transparent 60%);
  z-index: 0;
}
.cta-banner-inner {
  position: relative;
  z-index: 1;
}
.cta-banner h2 {
  color: #fff;
  font-family: var(--font-serif);
  font-size: 2rem;
  margin-bottom: 12px;
}
.cta-banner p {
  color: var(--cyan-pale);
  font-size: 1.05rem;
  margin-bottom: 24px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 40px;
  background: linear-gradient(135deg, var(--cyan-primary), var(--electric-blue));
  color: #fff;
  font-size: 1.1rem;
  font-weight: 700;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.3s;
  box-shadow: 0 0 24px rgba(0, 188, 212, 0.35);
  letter-spacing: 0.04em;
}
.cta-button:hover {
  background: linear-gradient(135deg, var(--cyan-glow), var(--synapse-spark));
  box-shadow: 0 0 36px rgba(0, 229, 255, 0.5);
  transform: translateY(-2px);
  color: #fff;
}

/* --- Reviews Section --- */
.reviews-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 24px;
}

.review-cards {
  display: grid;
  gap: 20px;
  margin: 28px 0;
}

.review-card {
  background: var(--bg-card);
  border-radius: var(--card-radius);
  border: 1px solid var(--border-light);
  padding: 24px;
  position: relative;
}
.review-card::before {
  content: '\201C';
  position: absolute;
  top: 8px;
  left: 16px;
  font-size: 3rem;
  color: var(--cyan-pale);
  font-family: var(--font-serif);
  line-height: 1;
}
.review-card p {
  padding-left: 28px;
  color: var(--text-soft);
  font-style: italic;
}
.review-author {
  margin-top: 10px;
  padding-left: 28px;
  font-size: 0.85rem;
  color: var(--cyan-deep);
  font-weight: 600;
}

/* --- Table (System Requirements etc) --- */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.95rem;
}
.spec-table th,
.spec-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-light);
  text-align: left;
}
.spec-table th {
  background: rgba(0, 188, 212, 0.05);
  font-weight: 700;
  color: var(--cyan-deep);
  font-family: var(--font-serif);
  width: 160px;
}
.spec-table td {
  color: var(--text-soft);
}

/* --- FAQ Accordion --- */
.faq-list {
  margin: 32px 0;
}

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

.faq-question {
  width: 100%;
  padding: 16px 20px;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  transition: color 0.2s;
}
.faq-question:hover {
  color: var(--cyan-deep);
}

.faq-icon {
  font-size: 1.2rem;
  color: var(--cyan-primary);
  transition: transform 0.3s;
  flex-shrink: 0;
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-item.open .faq-answer {
  max-height: 500px;
}
.faq-answer-inner {
  padding: 0 20px 20px;
  color: var(--text-soft);
  line-height: 1.8;
}

/* --- Tips / Info Boxes --- */
.tip-box {
  background: rgba(0, 188, 212, 0.06);
  border-left: 4px solid var(--cyan-primary);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 20px 0;
}
.tip-box strong {
  color: var(--cyan-deep);
}

.warning-box {
  background: rgba(255, 82, 82, 0.06);
  border-left: 4px solid var(--danger-red);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 20px 0;
}
.warning-box strong {
  color: var(--danger-red);
}

.info-box {
  background: rgba(124, 77, 255, 0.06);
  border-left: 4px solid var(--electric-violet);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 20px 0;
}

/* --- Timeline --- */
.timeline {
  position: relative;
  padding-left: 28px;
  margin: 28px 0;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan-primary), var(--electric-violet));
}

.timeline-item {
  position: relative;
  margin-bottom: 20px;
  padding-bottom: 4px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -24px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan-glow);
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
}
.timeline-year {
  font-weight: 700;
  color: var(--cyan-deep);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}
.timeline-desc {
  color: var(--text-soft);
  font-size: 0.95rem;
}

/* --- Step Numbers --- */
.step-list {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 24px 0;
}
.step-list li {
  counter-increment: step;
  position: relative;
  padding-left: 48px;
  margin-bottom: 20px;
  color: var(--text-soft);
}
.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--cyan-primary), var(--electric-blue));
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* --- Footer --- */
.site-footer {
  background: var(--header-bg);
  border-top: 2px solid var(--header-border);
  padding: 24px;
  text-align: center;
}
.site-footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 0;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 16px;
    gap: 10px;
  }
  .header-nav {
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
    width: 100%;
    order: 3;
  }
  .header-nav a {
    font-size: 0.85rem;
  }
  .header-cta {
    font-size: 0.8rem;
    padding: 6px 14px;
  }

  .hero {
    min-height: 340px;
  }
  .hero-title {
    font-size: 2rem;
  }

  .page-hero {
    min-height: 160px;
  }

  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }

  .card-grid,
  .feature-cards {
    grid-template-columns: 1fr;
  }

  .screenshot-grid {
    grid-template-columns: 1fr 1fr;
  }

  .content-section {
    padding: 40px 16px;
  }

  .spec-table th {
    width: 100px;
  }
}

@media (max-width: 480px) {
  .screenshot-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 1.6rem;
  }

  .header-nav {
    gap: 10px;
  }
  .header-nav a {
    font-size: 0.8rem;
  }
}