/* ---------- Base ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --blue: #2186D5;
  --green: #008A08;
  --footer: #086B87;
  --text: #222222;
  --gray: #666666;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: #ffffff;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

main {
  display: flex;
  justify-content: center;
  padding: 34px 20px 60px;
}

.landing-page {
  width: 100%;
  max-width: 560px;
}

/* ---------- Section 1: Hero headline ---------- */
.hero-headline {
  text-align: center;
  font-size: 33px;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.2px;
  color: var(--text);
  margin-bottom: 22px;
}

.hero-headline .blue {
  color: var(--blue);
}

/* ---------- Section 2: Hero image ---------- */
.video-section {
  text-align: center;
}

.hero-link {
  display: inline-block;
  width: 100%;
}

.hero-image {
  display: block;
  width: 100%;
  max-width: 540px;
  height: auto;
  margin: 0 auto;
}

/* ---------- Section 3: Instruction text ---------- */
.video-instruction {
  text-align: center;
  font-size: 15px;
  line-height: 1.45;
  color: #111;
  margin: 18px auto 22px;
  max-width: 500px;
}

/* ---------- CTA Buttons ---------- */
.cta-wrap {
  text-align: center;
  margin: 24px 0;
}

.cta-button {
  display: inline-block;
  background: var(--green);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
  text-align: center;
  border-radius: 6px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
}

.cta-primary {
  padding: 13px 28px;
  font-size: 17px;
  white-space: nowrap;
}

.cta-arrow {
  min-width: 200px;
  padding: 16px 30px;
  font-size: 19px;
  letter-spacing: 0.3px;
}

/* ---------- Section 5: Main copy ---------- */
.main-content {
  max-width: 525px;
  margin: 0 auto;
}

.content-heading {
  font-size: 25px;
  line-height: 1.3;
  font-weight: 400;
  color: #111;
  margin-bottom: 18px;
}

.content-heading strong {
  font-weight: 700;
}

.main-content p {
  font-size: 16.5px;
  line-height: 1.5;
  color: var(--text);
  margin-bottom: 18px;
}

.inline-link {
  color: var(--blue);
  text-decoration: underline;
}

/* ---------- Section 7: Comments ---------- */
.comments {
  max-width: 480px;
  margin: 10px auto 0;
  padding: 0 4px;
}

.comment {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 6px;
}

.thread {
  margin-bottom: 6px;
}

.comment.reply {
  margin-left: 34px;
  margin-top: 6px;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  margin-top: 2px;
}

.comment-body {
  flex: 1;
  min-width: 0;
}

.bubble {
  display: inline-block;
  background: #f0f2f5;
  border-radius: 16px;
  padding: 7px 12px;
  position: relative;
}

.bubble .name {
  display: block;
  font-size: 12.5px;
  font-weight: 700;
  color: #050505;
  line-height: 1.35;
}

.bubble .text {
  display: block;
  font-size: 13px;
  color: #050505;
  line-height: 1.35;
}

.meta {
  font-size: 11.5px;
  color: var(--gray);
  padding: 3px 12px 0;
  position: relative;
}

.meta .action {
  font-weight: 600;
  color: #65676b;
}

.reactions {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  float: right;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
  padding: 1px 5px 1px 3px;
  margin-top: -2px;
}

.react {
  font-size: 11px;
  line-height: 1;
}

.react.like { color: #1877f2; }
.react.love { color: #f3425f; }

.reactions .count {
  font-size: 11.5px;
  color: var(--gray);
  margin-left: 2px;
}

/* ---------- Section 8: Scientific references ---------- */
.references {
  text-align: center;
  margin: 40px auto 0;
}

.references-image {
  display: block;
  width: 100%;
  max-width: 520px;
  height: auto;
  margin: 0 auto;
}

/* ---------- Section 10: Footer ---------- */
.site-footer {
  background: var(--footer);
  color: #ffffff;
  text-align: center;
  padding: 55px 20px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 22%;
  max-width: 900px;
  margin: 0 auto 40px;
  flex-wrap: wrap;
}

.footer-links a {
  color: #ffffff;
  text-decoration: none;
  font-size: 13px;
}

.footer-links a:hover {
  text-decoration: underline;
}

.copyright {
  font-size: 12.5px;
  margin-bottom: 14px;
}

.disclaimer {
  font-size: 12px;
}

/* ---------- Legal / info pages ---------- */
.legal-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 50px 20px 60px;
}

.legal-page .page-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.legal-page .updated {
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 28px;
}

.legal-page h2 {
  font-size: 20px;
  font-weight: 700;
  color: #111;
  margin: 28px 0 10px;
}

.legal-page p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 14px;
}

.legal-page ul {
  margin: 0 0 14px 22px;
}

.legal-page li {
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 6px;
}

.legal-page a {
  color: var(--blue);
  text-decoration: underline;
}

.back-home {
  display: inline-block;
  margin-top: 30px;
  color: var(--blue);
  text-decoration: none;
  font-size: 15px;
  font-weight: 700;
}

.back-home:hover {
  text-decoration: underline;
}

@media (max-width: 600px) {
  .legal-page .page-title {
    font-size: 25px;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .hero-headline {
    font-size: 26px;
  }
  .content-heading {
    font-size: 22px;
  }
  .main-content p {
    font-size: 16px;
  }
  .footer-links {
    gap: 18px;
  }
}

@media (max-width: 420px) {
  .hero-headline {
    font-size: 23px;
  }
  .cta-primary {
    white-space: normal;
    width: 100%;
  }
  .video-instruction {
    font-size: 14px;
  }
  .footer-links {
    flex-direction: column;
    gap: 14px;
  }
}