/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #000000;
  --bg-alt: #0a0a0a;
  --section-alt: #111111;
  --accent-purple: #5856D6;
  --heart-red: #FF3B30;
  --zone-green: #34C759;
  --zone-yellow: #FFD60A;
  --text-primary: #f5f5f7;
  --text-muted: #6e6e73;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", sans-serif, "Helvetica Neue";
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* ===== NAV ===== */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

#nav.scrolled {
  border-bottom-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.05);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-icon {
  width: 32px;
  border-radius: 8px;
  overflow: hidden;
  flex-shrink: 0;
  object-fit: contain;
}

.nav-wordmark {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-muted);
  transition: color 0.2s;
}

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

/* ===== HERO ===== */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  text-align: center;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(0,0,0,0.5) 0%,
    rgba(0,0,0,0.65) 50%,
    rgba(0,0,0,0.85) 100%
  );
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 120px 24px 80px;
  max-width: 800px;
}

.hero-headline {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 300;
  color: rgba(245, 245, 247, 0.85);
  margin-bottom: 40px;
  letter-spacing: -0.01em;
}

.badge-link {
  display: inline-block;
  transition: opacity 0.2s, transform 0.2s;
}

.badge-link:hover {
  opacity: 0.85;
  transform: scale(1.03);
}

.badge-img {
  height: 50px;
  width: auto;
}

.badge-large {
  height: 60px;
}

.mobile-break {
  display: none;
}

@media (max-width: 768px) {
  .mobile-break {
    display: block;
  }
}

.hero-disclaimer {
  margin-top: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== SECTIONS ===== */
.section-dark {
  background-color: var(--bg-alt);
}

.section-alt {
  background-color: var(--section-alt);
}

.section-purple {
  background-color: #0d0c1e;
  background-image: radial-gradient(ellipse at 60% 50%, rgba(88, 86, 214, 0.18) 0%, transparent 70%);
}

.section-cta {
  background-color: #050505;
  padding: 0;
  text-align: center;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 50px 24px;
}

/* ===== FEATURE ROWS ===== */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.feature-row.reverse {
  direction: rtl;
}

.feature-row.reverse > * {
  direction: ltr;
}

.feature-media {
  display: flex;
  justify-content: center;
  align-items: center;
}

.feature-img {
  max-height: 1200px;
  width: auto;
  object-fit: contain;
  border-radius: 20px;
}

.phone-img {
  max-height: 1120px;
  filter: drop-shadow(0 30px 60px rgba(0,0,0,0.7));
}

.watch-img {
  max-height: 840px;
  filter: drop-shadow(0 20px 50px rgba(0,0,0,0.8));
}

/* ===== COPY ===== */
.eyebrow {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-purple);
  margin-bottom: 14px;
}

.section-headline {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.section-headline.centered {
  text-align: center;
}

.body-text {
  font-size: 17px;
  line-height: 1.7;
  color: rgba(245, 245, 247, 0.75);
  max-width: 480px;
}

.footnote {
  font-size: 17px;
  line-height: 1.7;
  color: rgba(245, 245, 247, 0.75);
  margin-top: 16px;
  max-width: 480px;
}

/* ===== ZONE PILLS ===== */
.zone-pills {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 28px;
}

.zone-pill {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 15px;
  font-weight: 600;
  width: fit-content;
  letter-spacing: -0.01em;
}

.zone-1 { background: rgba(142, 142, 147, 0.2); color: #aeaeb2; border: 1px solid rgba(142,142,147,0.3); }
.zone-2 { background: rgba(52, 199, 89, 0.15); color: var(--zone-green); border: 1px solid rgba(52,199,89,0.3); }
.zone-3 { background: rgba(255, 214, 10, 0.15); color: var(--zone-yellow); border: 1px solid rgba(255,214,10,0.3); }
.zone-4 { background: rgba(255, 149, 0, 0.15); color: #FF9500; border: 1px solid rgba(255,149,0,0.3); }
.zone-5 { background: rgba(255, 59, 48, 0.15); color: var(--heart-red); border: 1px solid rgba(255,59,48,0.3); }

/* ===== PROMO VIDEO ===== */
.video-wrapper {
  max-width: 800px;
  margin: 40px auto 0;
}

.promo-video-player {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  background: #000;
}

/* ===== CTA SECTION ===== */
.cta-headline {
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-bottom: 36px;
}

.centered {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.requirements-list {
  list-style: none;
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 24px;
}

.requirements-list li {
  font-size: 14px;
  color: var(--text-muted);
  position: relative;
}

.requirements-list li:not(:last-child)::after {
  content: "·";
  position: absolute;
  right: -14px;
  color: var(--text-muted);
}

/* ===== FOOTER ===== */
#footer {
  background-color: #000;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 0;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.footer-legal {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.footer-copy {
  font-size: 12px;
  color: var(--text-muted);
}

.footer-copy a {
  color: var(--text-muted);
  transition: color 0.2s;
}

.footer-copy a:hover {
  color: var(--text-primary);
}

/* ===== FADE-IN ANIMATION ===== */
.fade-in-section {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .feature-row {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .feature-row.reverse {
    direction: ltr;
  }

  .feature-row.reverse > * {
    direction: ltr;
  }

  /* On mobile, image always comes first */
  .feature-row .feature-media {
    order: 1;
  }

  .feature-row .feature-copy {
    order: 2;
  }

  .feature-row.reverse .feature-copy {
    order: 2;
  }

  .feature-row.reverse .feature-media {
    order: 1;
  }

  .container {
    padding: 50px 20px;
  }

  .feature-img {
    max-height: 800px;
  }

  .body-text {
    max-width: 100%;
  }

  .zone-pills {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .requirements-list {
    flex-direction: column;
    align-items: center;
    gap: 6px;
  }

  .requirements-list li::after {
    display: none;
  }

  .hero-video {
    display: none;
  }

  #hero {
    background: url('images/hero-phone.jpg') center/cover no-repeat;
    min-height: auto;
  }

  .hero-content {
    padding: 80px 20px 48px;
  }
}

@media (max-width: 480px) {
  .hero-headline {
    font-size: 32px;
  }

  .section-headline {
    font-size: 28px;
  }

  .cta-headline {
    font-size: 32px;
  }
}

@media (min-width: 1280px) {
  .feature-row {
    gap: 100px;
  }
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 720px;
  margin: 48px auto 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.faq-item {
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.faq-item + .faq-item {
  margin-top: 8px;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  color: var(--text-primary);
  transition: color 0.2s;
}

.faq-question::-webkit-details-marker { display: none; }

.faq-question::after {
  content: "+";
  font-size: 22px;
  font-weight: 300;
  color: var(--accent-purple);
  flex-shrink: 0;
  margin-left: 16px;
  transition: transform 0.2s;
}

.faq-item[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 245, 247, 0.7);
}

.faq-answer .footnote {
  font-size: 15px;
}

.faq-answer p + p,
.faq-answer p + ol,
.faq-answer ol + p {
  margin-top: 12px;
}

.faq-answer ol,
.faq-answer ul {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.eyebrow.centered {
  text-align: center;
}

/* ===== AHA MOMENT ===== */
.section-aha {
  background-color: #080812;
  background-image: radial-gradient(ellipse at 30% 50%, rgba(88, 86, 214, 0.12) 0%, transparent 65%);
}
.aha-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.aha-body-2 {
  margin-top: 16px;
  font-weight: 500;
  color: rgba(245, 245, 247, 0.9);
}
.aha-video {
  width: 100%;
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.7);
  object-fit: cover;
  max-height: 480px;
}

/* ===== FEATURE 1: WATCH VIDEO (replaces static img) ===== */
.watch-video {
  width: 100%;
  border-radius: 20px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.7);
  object-fit: cover;
  max-height: 480px;
}

/* ===== POSITIONING SECTION ===== */
.section-proof {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.positioning-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 32px 0 24px;
}
.positioning-item {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 300;
  color: var(--text-muted);
  letter-spacing: -0.01em;
}
.positioning-tagline {
  font-size: clamp(18px, 2.5vw, 22px);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.positioning-brand {
  color: var(--text-muted);
  font-size: 15px;
}

/* ===== WHO USES HEARTOXY ===== */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
  width: 100%;
}

.audience-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  padding: 32px 28px;
  text-align: left;
}

.audience-title {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.audience-body {
  font-size: 15px;
  line-height: 1.6;
  color: rgba(245, 245, 247, 0.65);
}

/* ===== FEATURE SUB-NOTE ===== */
.feature-sub-note {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 15px;
}

.feature-video-inline {
  width: 100%;
  border-radius: 14px;
  margin-top: 28px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .audience-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .audience-card {
    background: none;
    border: none;
    border-radius: 0;
    padding: 0;
  }

  #who .centered {
    text-align: left;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  .aha-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  /* On mobile, video comes first */
  .aha-media {
    order: 1;
  }

  .aha-copy {
    order: 2;
  }
}