:root {
  --bg: #090d13;
  --bg-2: #0f1722;
  --panel: rgba(17, 24, 39, 0.76);
  --panel-strong: #111827;
  --text: #edf3ff;
  --muted: #9aa7bb;
  --line: rgba(148, 163, 184, 0.18);
  --primary: #c7d2fe;
  --primary-strong: #5b7cff;
  --accent: #a5f3fc;
  --shadow: 0 32px 80px rgba(2, 6, 23, 0.62);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top left, rgba(91, 124, 255, 0.12), transparent 28%), linear-gradient(180deg, #090d13 0%, #0d121b 42%, #0d1320 100%);
}

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

.page-shell {
  max-width: 1280px;
  margin: 0 auto;
  padding: 26px 20px 100px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 18px 22px;
  margin-bottom: 84px;
  background: rgba(13, 19, 28, 0.8);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
  position: sticky;
  top: 12px;
  backdrop-filter: blur(10px);
  z-index: 10;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #dfe8ff, #7dd3fc);
  color: #0d1320;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.brand-name {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 700;
}

.brand-sub {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  flex-wrap: wrap;
}

.main-nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.main-nav a:hover {
  color: var(--text);
}

.hero {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 54px;
  align-items: center;
  min-height: 540px;
  padding: 28px 0 120px;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
}

.hero-copy h1 {
  margin: 0 0 18px;
  max-width: 700px;
  font-size: clamp(2.8rem, 5vw, 5.2rem);
  line-height: 0.96;
  letter-spacing: -0.06em;
}

.hero-copy p {
  margin: 0;
  max-width: 640px;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.primary-btn,
.secondary-btn,
.card-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 14px 22px;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-btn,
.card-btn {
  background: linear-gradient(135deg, #c7d2fe 0%, #5b7cff 100%);
  color: #08111d;
  box-shadow: 0 16px 32px rgba(91, 124, 255, 0.35);
}

.secondary-btn {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.primary-btn:hover,
.secondary-btn:hover,
.card-btn:hover {
  transform: translateY(-2px);
}

.hero-panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(180px, 1fr));
  gap: 22px;
}

.mini-card,
.info-card,
.source-card,
.viewer-shell {
  background: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.mini-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 160px;
  padding: 24px 18px;
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.82), rgba(12, 16, 26, 0.82));
}

.mini-card span {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mini-card strong {
  font-size: 1.15rem;
}

.section-block,
.preview-section {
  margin-top: 120px;
}

.section-heading {
  margin-bottom: 30px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 3vw, 2.8rem);
  letter-spacing: -0.05em;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 24px;
}

.info-card {
  padding: 28px 24px;
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.88), rgba(10, 13, 20, 0.9));
}

.info-card h3 {
  margin: 0 0 14px;
  font-size: 1.35rem;
}

.info-card ul {
  margin: 0 0 22px;
  padding-left: 18px;
  color: var(--muted);
  line-height: 2;
}

.card-btn {
  width: 100%;
}

.viewer-shell {
  overflow: hidden;
}

.viewer-header {
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 16, 25, 0.9);
  font-weight: 700;
}

#pdfFrame {
  width: 100%;
  min-height: 680px;
  border: none;
  background: #fff;
}

.source-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(220px, 1fr));
  gap: 20px;
}

.source-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 120px;
  padding: 22px 20px;
  color: var(--text);
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.source-card:hover {
  transform: translateY(-2px);
  border-color: rgba(167, 196, 255, 0.35);
}

.source-card span {
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.source-card strong {
  font-size: 1.15rem;
  margin-top: 10px;
}

@media (max-width: 980px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    min-height: auto;
    padding-bottom: 80px;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(220px, 1fr));
  }

  .source-grid {
    grid-template-columns: repeat(2, minmax(200px, 1fr));
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding-left: 14px;
    padding-right: 14px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 52px;
  }

  .main-nav {
    gap: 12px 18px;
  }

  .hero-panel,
  .card-grid,
  .source-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 4px;
  }

  #pdfFrame {
    min-height: 500px;
  }
}