:root {
  --page-bg: #eef2f4;
  --surface: #ffffff;
  --surface-muted: #f7f9fb;
  --text-strong: #17222f;
  --text-muted: #5b6775;
  --accent: #0f6c8d;
  --border: rgba(23, 34, 47, 0.08);
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(15, 108, 141, 0.12), transparent 34%),
    linear-gradient(180deg, #f8fbfc 0%, var(--page-bg) 100%);
  color: var(--text-strong);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.page-shell {
  padding-bottom: 4rem;
}

.hero {
  max-width: 1180px;
  margin: 0 auto;
  padding: 3.8rem 1.5rem 2.2rem;
  text-align: center;
}

.hero-eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-title {
  margin: 0;
  color: var(--text-strong);
  font-size: clamp(1.78rem, 2.65vw, 2.58rem);
  font-weight: 600;
  line-height: 1.12;
}

.hero-subtitle {
  max-width: 780px;
  margin: 1.15rem auto 0;
  color: var(--text-muted);
  font-size: 1.06rem;
  line-height: 1.7;
}

.page-content {
  max-width: 1140px;
}

.video-section {
  margin-bottom: 2rem;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.section-heading {
  margin-bottom: 1.4rem;
}

.section-heading h2 {
  margin: 0 0 0.55rem;
  font-size: 1.9rem;
  font-weight: 600;
}

.section-heading p {
  margin: 0;
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.65;
}

.abstract-copy {
  margin: 0;
  color: #263341;
  font-size: 1.04rem;
  line-height: 1.9;
  text-align: justify;
}

.video-card {
  height: 100%;
  padding: 1rem;
  border: 1px solid rgba(23, 34, 47, 0.06);
  border-radius: var(--radius-md);
  background: var(--surface-muted);
}

.video-card h3 {
  margin: 0 0 0.85rem;
  font-size: 1.22rem;
  font-weight: 600;
}

.video-frame {
  display: block;
  width: 100%;
  border: 0;
  border-radius: 16px;
  background: #000000;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.14);
}

.hero-video {
  aspect-ratio: 16 / 9;
}

.video-caption {
  margin: 0.9rem 0 0;
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.6;
}

.footer-note {
  max-width: 760px;
  margin: 0 auto;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.7;
}

.acknowledgement {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.7;
}

.reviewer-notice {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 1100;
  width: min(34rem, calc(100vw - 3rem));
  padding: 1.35rem 3.4rem 1.35rem 1.35rem;
  border: 1px solid rgba(23, 34, 47, 0.1);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.95);
  box-shadow: 0 22px 50px rgba(15, 23, 42, 0.18);
  backdrop-filter: blur(12px);
}

.reviewer-notice[hidden] {
  display: none !important;
}

.reviewer-notice p {
  margin: 0;
  color: #4c5a6e;
  font-size: 1rem;
  line-height: 1.65;
}

.reviewer-notice strong {
  color: var(--text-strong);
}

.reviewer-notice-close {
  position: absolute;
  top: 0.75rem;
  right: 0.85rem;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: #6b7788;
  font-size: 2rem;
  line-height: 1;
  cursor: pointer;
}

.reviewer-notice-close:hover {
  background: rgba(15, 108, 141, 0.08);
  color: var(--text-strong);
}

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

a:hover {
  color: #165a73;
}

@media (max-width: 767px) {
  .hero {
    padding-top: 3rem;
    padding-bottom: 1.6rem;
  }

  .hero-subtitle {
    font-size: 0.98rem;
  }

  .hero-title {
    font-size: 1.72rem;
    line-height: 1.14;
  }

  .video-section {
    padding: 1.35rem;
    border-radius: 22px;
  }

  .reviewer-notice {
    right: 1rem;
    bottom: 1rem;
    width: calc(100vw - 2rem);
    padding: 1.05rem 3rem 1.05rem 1.05rem;
    border-radius: 20px;
  }

  .reviewer-notice p {
    font-size: 0.96rem;
    line-height: 1.58;
  }

  .section-heading h2 {
    font-size: 1.55rem;
  }

  .abstract-copy {
    text-align: left;
  }
}