:root {
  --bg: #07111f;
  --bg-soft: #0c1a2d;
  --panel: rgba(255,255,255,0.04);
  --panel-strong: rgba(255,255,255,0.07);
  --border: rgba(255,255,255,0.11);
  --text: #eaf2ff;
  --muted: #b8c6db;
  --white: #ffffff;
  --accent: #63d1ff;
  --accent-2: #6ee7b7;
  --gold: #f4b63f;
  --navy: #07111f;
  --shadow: 0 18px 45px rgba(0,0,0,0.28);
  --glow: 0 0 0 1px rgba(99,209,255,0.14), 0 14px 40px rgba(0,0,0,0.24);
  --radius: 18px;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Outfit, Arial, Helvetica, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(99,209,255,0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(110,231,183,0.12), transparent 24%),
    linear-gradient(180deg, #08111d 0%, #0b1626 100%);
  line-height: 1.65;
  overflow-x: hidden;
}

body.sidebar-open {
  overflow: hidden;
}

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

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

a:hover {
  text-decoration: underline;
}

.vb-upgrade-banner,
.authority-banner {
  text-align: center;
  padding: 0.8rem 1rem;
  font-size: 0.95rem;
}

.vb-upgrade-banner {
  background: linear-gradient(90deg, #10233d, #17355c);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.vb-upgrade-banner a {
  color: #fff4c2;
  font-weight: 700;
}

.authority-banner {
  background: linear-gradient(90deg, rgba(244,182,63,0.18), rgba(244,182,63,0.07));
  color: #ffe8ad;
  border-bottom: 1px solid rgba(244,182,63,0.18);
  font-weight: 600;
}

nav {
  position: sticky;
  top: 0;
  z-index: 1200;
  backdrop-filter: blur(12px);
  background: rgba(6, 14, 25, 0.92);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
  min-height: 70px;
  padding: 0 18px;
}

.nav-brand {
  font-family: "DM Serif Display", Georgia, serif;
  font-size: 1.55rem;
  color: var(--white);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--white);
}

.nav-cta,
.btn,
.book-links a,
.resource-card,
.mini-book a,
.floating-book-cta,
.floating-vbnet-cta {
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  background: linear-gradient(135deg, var(--gold), #ff8c42);
  color: #1a1202;
  font-weight: 800;
  padding: .78rem 1rem;
  border-radius: 999px;
  box-shadow: 0 8px 24px rgba(244,182,63,.24);
}

.nav-cta:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.sidebar-toggle,
.sidebar-close {
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.07);
  color: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .55rem .7rem;
  font-size: 1.1rem;
  cursor: pointer;
}

.page-layout {
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 18px 40px;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 24px;
}

.sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--glow);
  padding: 1.1rem;
  max-height: calc(100vh - 116px);
  overflow: auto;
}

.sidebar h5,
.sidebar h6 {
  margin: 1rem 0 .7rem;
  color: var(--white);
  font-size: .95rem;
}

.sidebar h5:first-of-type {
  margin-top: 0;
}

.sidebar a {
  display: block;
  padding: .48rem .62rem;
  border-radius: 10px;
  color: var(--muted);
  margin-bottom: .1rem;
}

.sidebar a:hover,
.sidebar a.active {
  background: rgba(99,209,255,.12);
  color: var(--white);
  text-decoration: none;
}

.sidebar .mini-book {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,.08);
}

.sidebar .mini-book img {
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.sidebar-overlay {
  display: none;
}

.main-content {
  min-width: 0;
  position: relative;
  z-index: 1;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, .85fr);
  gap: 22px;
  align-items: stretch;
}

.hero > div,
.version-card,
.content-card,
.book-card,
.stat,
.testimonial,
.resource-card,
.cta-banner,
.top-release-card,
.vb-upgrade-box,
.vb-compare-box,
.learning-path-box,
.transition-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--glow);
}

.hero > div:first-child {
  padding: 2rem;
}

.hero-badge,
.section-label,
.release-tag {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .42rem .8rem;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .02em;
  text-transform: uppercase;
}

.hero-badge {
  background: rgba(99,209,255,.12);
  color: var(--accent);
  border: 1px solid rgba(99,209,255,.25);
}

.section-label {
  background: rgba(110,231,183,.12);
  color: var(--accent-2);
  border: 1px solid rgba(110,231,183,.2);
  margin-bottom: .8rem;
}

.release-tag {
  background: rgba(244,182,63,.12);
  color: #ffe39f;
  border: 1px solid rgba(244,182,63,.22);
}

.hero h1 {
  font-family: "DM Serif Display", Georgia, serif;
  font-size: clamp(2.3rem, 5vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: .9rem 0 1rem;
  color: var(--white);
}

.hero h1 span,
.content-card h2 span,
.top-release-card h3 span {
  color: var(--accent);
}

.hero-sub,
.section-intro,
.version-item .value,
.book-info p,
.testimonial p,
.resource-card p,
.path-step p,
.inline-upgrade-box p,
.transition-box p,
.cta-inner p {
  color: var(--muted);
  margin: 0;
}

.hero-buttons,
.book-links,
.top-release-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
  margin-top: 1.35rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .9rem 1.2rem;
  border-radius: 999px;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #8ef5ff);
  color: var(--navy);
  box-shadow: 0 10px 22px rgba(99,209,255,.22);
}

.btn-outline {
  border-color: rgba(255,255,255,.15);
  color: var(--white);
  background: rgba(255,255,255,.03);
}

.btn-outline:hover {
  background: rgba(255,255,255,.07);
}

.version-card,
.content-card,
.book-card,
.testimonial,
.resource-card,
.top-release-card,
.vb-upgrade-box,
.cta-banner,
.stat,
.transition-box {
  padding: 1.35rem;
}

.version-card h3,
.content-card h2,
.book-info h4,
.resource-card h4,
.testimonial cite,
.vb-compare-box h3,
.learning-path-box h3,
.transition-box h3,
.cta-inner h2,
.top-release-card h3 {
  margin-top: 0;
  color: var(--white);
}

.version-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .72rem 0;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.version-item:last-child {
  border-bottom: 0;
}

.version-item .label {
  color: #9eb4cf;
  font-weight: 600;
}

.version-item .value {
  text-align: right;
  max-width: 62%;
}

section {
  margin-top: 26px;
}

.stats-row,
.split-grid,
.books-grid,
.testimonials,
.resources-grid,
.path-steps,
.vb-compare-grid {
  display: grid;
  gap: 18px;
}

.stats-row { grid-template-columns: repeat(4, minmax(0,1fr)); }
.split-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
.books-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.testimonials { grid-template-columns: repeat(3, minmax(0,1fr)); }
.resources-grid { grid-template-columns: repeat(3, minmax(0,1fr)); }
.vb-compare-grid,
.path-steps { grid-template-columns: repeat(2, minmax(0,1fr)); }

.stat {
  text-align: center;
}

.stat-num {
  display: block;
  font-size: 1.75rem;
  line-height: 1;
  font-weight: 800;
  color: var(--white);
  margin-bottom: .42rem;
}

.stat-label {
  color: var(--muted);
  font-size: .95rem;
}

.quick-points,
.book-info ul,
.vb-compare-card ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}
.books-grid .book-card {
  overflow: hidden;
}

.books-grid .book-card img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: contain;
  background: #0b1626;
  border-radius: 14px;
  margin-bottom: 1rem;
  display: block;
}
.book-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.book-card img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 14px;
  margin-bottom: 1rem;
}

.book-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  border-radius: 14px;
}

.book-info {
  min-width: 0;
}

.book-info .author {
  color: #c9d7ea;
  margin-bottom: .75rem;
  font-size: .95rem;
}

.book-links a {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .72rem .9rem;
  border-radius: 999px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.09);
  color: var(--white);
}

.book-links a:hover {
  text-decoration: none;
  background: rgba(99,209,255,.12);
  transform: translateY(-1px);
}

.lesson-book-card {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 18px;
  align-items: start;
}

.lesson-book-image {
  width: 160px;
  max-width: 160px;
  overflow: hidden;
  border-radius: 14px;
}

.lesson-book-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
  border-radius: 14px;
}
.inline-upgrade-box {
  background: rgba(244,182,63,.1);
  border: 1px solid rgba(244,182,63,.22);
  border-left: 4px solid var(--gold);
  border-radius: 14px;
  margin-top: 1.3rem;
  padding: 1.35rem;
}

.transition-box {
  background: rgba(99,209,255,.07);
}

.vb-upgrade-box a,
.transition-box a,
.inline-upgrade-box a,
.top-release-card a,
.vb-compare-cta a {
  font-weight: 700;
}

.divider {
  border: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.12), transparent);
  margin: 26px 0;
}

.testimonial cite {
  display: block;
  margin-top: 1rem;
  color: #d8e5f7;
  font-style: normal;
  font-weight: 700;
}

.resource-card {
  display: block;
  color: inherit;
}

.resource-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  border-color: rgba(99,209,255,.28);
}

.resource-card h4 {
  margin-bottom: .45rem;
}

.cta-banner {
  margin-top: 28px;
  background: linear-gradient(135deg, rgba(99,209,255,.16), rgba(110,231,183,.12));
}

.cta-inner {
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}

.top-release-card {
  display: grid;
  grid-template-columns: 180px minmax(0,1fr);
  gap: 1.2rem;
  align-items: center;
  margin-top: 1rem;
}

.top-release-card img {
  border-radius: 16px;
  box-shadow: var(--shadow);
}

.top-release-note {
  color: #ffe39f;
  font-size: .94rem;
  margin-top: .8rem;
}

.floating-book-cta,
.floating-vbnet-cta {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 1100;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .9rem 1.05rem;
  border-radius: 999px;
  font-weight: 800;
  color: #1a1202;
  background: linear-gradient(135deg, var(--gold), #ff8c42);
  box-shadow: 0 10px 26px rgba(244,182,63,.26);
}

.floating-book-cta:hover,
.floating-vbnet-cta:hover {
  text-decoration: none;
  transform: translateY(-2px);
}

.footer-links,
.footer-version-links,
.footer-other-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

footer {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,.18);
  padding: 2rem 1rem 3rem;
  text-align: center;
}

footer h4 {
  color: var(--white);
  margin-bottom: .8rem;
}

footer > div {
  margin-bottom: 1rem;
}

.copyright {
  color: #9eb4cf;
  font-size: .94rem;
}

@media (max-width: 1080px) {
  .page-layout {
    grid-template-columns: 260px minmax(0,1fr);
  }

  .books-grid,
  .testimonials,
  .resources-grid {
    grid-template-columns: repeat(2, minmax(0,1fr));
  }

  .stats-row {
    grid-template-columns: repeat(2, minmax(0,1fr));
  }
}

@media (max-width: 820px) {
  .sidebar-toggle,
  .sidebar-close {
    display: inline-flex;
  }

  .nav-cta,
  .nav-links {
    display: none;
  }

  .page-layout {
    display: block;
    padding: 20px 14px 36px;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: min(84vw, 320px);
    height: 100dvh;
    max-height: 100dvh;
    margin: 0;
    padding: 72px 16px 24px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    background: #0f172a;
    border: 0;
    border-right: 1px solid rgba(255,255,255,0.08);
    border-radius: 0 18px 18px 0;
    box-shadow: 0 20px 50px rgba(0,0,0,0.45);
    z-index: 2001;
    transform: translateX(-110%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform .28s ease, opacity .2s ease, visibility .2s ease;
  }

  .sidebar.open {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .sidebar-close {
    position: absolute;
    top: 14px;
    right: 14px;
    z-index: 2002;
  }

  .sidebar-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .25s ease, visibility .25s ease;
  }

  .sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .hero,
  .split-grid,
  .top-release-card,
  .books-grid,
  .testimonials,
  .resources-grid,
  .vb-compare-grid,
  .path-steps {
    grid-template-columns: 1fr;
  }

  .floating-book-cta,
  .floating-vbnet-cta {
    right: 12px;
    bottom: 12px;
    padding: .8rem .95rem;
    font-size: .92rem;
  }
}

@media (max-width: 560px) {
  .nav-inner {
    min-height: 62px;
    padding: 0 14px;
  }

  .nav-brand {
    font-size: 1.3rem;
  }

  .hero > div:first-child,
  .version-card,
  .content-card,
  .book-card,
  .testimonial,
  .resource-card,
  .top-release-card,
  .vb-upgrade-box,
  .cta-banner,
  .stat,
  .transition-box,
  .inline-upgrade-box {
    padding: 1rem;
  }

  .stats-row {
    grid-template-columns: 1fr;
  }

  .top-release-card {
    gap: 1rem;
  }

  .top-release-card img {
    max-width: 220px;
  }
}