*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --cream:  #F5F1EB;
  --dark:   #1A1714;
  --mid:    #6B6560;
  --border: #E0DAD2;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--cream);
  color: var(--dark);
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ───────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--cream);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 40px;
  height: 60px;
}

.nav-brand {
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.nav-cta {
  background: var(--dark);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 13px;
  padding: 8px 18px;
  border-radius: 40px;
  transition: opacity 0.2s;
}
.nav-cta:hover { opacity: 0.75; }

/* ── LABELS ────────────────────────────────────────────── */
.hop-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 16px;
}
.hop-label.muted { color: #555; }

/* ── IMAGE SLOTS ───────────────────────────────────────── */
.img-slot {
  background: #EAE5DE;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  color: #aaa;
  font-size: 12px;
  font-style: italic;
  line-height: 1.6;
  padding: 20px;
}

/* ── HERO ──────────────────────────────────────────────── */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 80px 40px 64px;
  align-items: center;
}

.hero-content h1 {
  font-size: clamp(3rem, 5.5vw, 4.2rem);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.03;
  margin-bottom: 22px;
}

.hero-sub {
  font-size: 18px;
  line-height: 1.65;
  color: var(--mid);
  font-weight: 500;
  margin-bottom: 28px;
}

.key-points {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 36px;
}

.key-point {
  font-size: 14px;
  font-weight: 600;
  color: var(--dark);
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.kp-dash {
  color: var(--mid);
  flex-shrink: 0;
}

.hero-slot {
  width: 100%;
  aspect-ratio: 4 / 5;
}

.hero-img-real {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 14px;
}

.strip-img-real {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 14px;
  display: block;
}

.kit-img-real {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 14px;
  display: block;
}

.lifestyle-img-real {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 14px;
  display: block;
}

/* ── PRODUCT STRIP ─────────────────────────────────────── */
.product-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px 80px;
}

.strip-slot {
  aspect-ratio: 1;
}

.embossed-slot {
  flex-direction: column;
  gap: 12px;
}

.embossed-text {
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--mid);
  text-align: center;
  line-height: 1.5;
}

/* ── CTA BUTTON ────────────────────────────────────────── */
.cta-btn {
  display: inline-block;
  background: var(--dark);
  color: #fff;
  text-decoration: none;
  font-weight: 800;
  font-size: 15px;
  padding: 14px 28px;
  border-radius: 40px;
  letter-spacing: 0.01em;
  transition: opacity 0.2s;
}
.cta-btn:hover { opacity: 0.75; }
.cta-large {
  font-size: 17px;
  padding: 16px 36px;
}

/* ── PROBLEM ───────────────────────────────────────────── */
.problem-section {
  background: var(--dark);
  padding: 80px 40px;
}

.problem-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.problem-text {
  max-width: 520px;
}

.problem-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.science-icons-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 14px;
  opacity: 0.92;
}

.problem-eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #555;
  margin-bottom: 20px;
}

.problem-section h2 {
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.problem-section p {
  font-size: 17px;
  color: #888;
  line-height: 1.8;
}

/* ── USE CASES ─────────────────────────────────────────── */
.use-cases {
  padding: 64px 40px;
  border-bottom: 1px solid var(--border);
}

.use-cases-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.uc-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 28px;
}

.uc-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.uc-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 16px;
}

.uc-icon {
  font-size: 22px;
  margin-bottom: 10px;
}

.uc-name {
  font-weight: 800;
  font-size: 14px;
  margin-bottom: 6px;
}

.uc-desc {
  font-size: 12px;
  color: var(--mid);
  line-height: 1.6;
}

/* ── SECTIONS ──────────────────────────────────────────── */
.section {
  padding: 80px 40px;
}

.section-dark {
  background: var(--dark);
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section h2 {
  font-size: clamp(2.2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 16px;
}
.section h2.on-dark { color: #fff; }

.section-sub {
  font-size: 16px;
  color: var(--mid);
  margin-bottom: 48px;
}
.section-sub.on-dark { color: #888; }

/* ── FLOW ──────────────────────────────────────────────── */
.flow {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin: 44px 0;
  flex-wrap: wrap;
}

.flow-step {
  flex: 1;
  min-width: 180px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.flow-num {
  width: 34px;
  height: 34px;
  background: var(--dark);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 13px;
  margin-bottom: 14px;
  flex-shrink: 0;
}

.flow-title {
  font-weight: 800;
  font-size: 16px;
  margin-bottom: 6px;
}

.flow-desc {
  font-size: 13px;
  color: var(--mid);
  line-height: 1.65;
}

.flow-arrow {
  display: flex;
  align-items: center;
  padding: 0 8px;
  font-size: 18px;
  color: var(--border);
  padding-top: 16px;
}

.slipup-box {
  background: #FFF8F0;
  border: 1px solid #EDD9C4;
  border-radius: 12px;
  padding: 28px 32px;
  max-width: 560px;
  margin-top: 8px;
}

.slipup-title {
  font-weight: 900;
  font-size: 16px;
  margin-bottom: 8px;
}

.slipup-body {
  font-size: 14px;
  color: var(--mid);
  line-height: 1.75;
}

/* ── WEEKS ─────────────────────────────────────────────── */
.weeks-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin: 44px 0 32px;
}

.week-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  padding: 28px 22px;
}

.week-ring {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  margin-bottom: 18px;
}

.week-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #666;
  margin-bottom: 6px;
}

.week-title {
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.week-desc {
  font-size: 13px;
  color: #888;
  line-height: 1.65;
}

/* ── RULES ─────────────────────────────────────────────── */
.rules-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.rule-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 24px;
}

.checkpoint-card {
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.08);
}

.checkpoint-quote {
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  line-height: 1.5;
  letter-spacing: -0.02em;
}

.rule-icon {
  font-size: 22px;
  margin-bottom: 10px;
}

.rule-title {
  font-weight: 800;
  font-size: 14px;
  color: #fff;
  margin-bottom: 6px;
}

.rule-desc {
  font-size: 13px;
  color: #888;
  line-height: 1.65;
}

/* ── SCIENCE ───────────────────────────────────────────── */
.science-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 44px;
}

.science-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}

.science-card-img {
  background: none;
  border: none;
  padding: 0;
}

.science-slot {
  width: 100%;
  height: 100%;
  min-height: 200px;
}

.science-sym {
  font-size: 22px;
  color: var(--mid);
  margin-bottom: 12px;
}

.science-title {
  font-weight: 800;
  font-size: 15px;
  margin-bottom: 8px;
}

.science-desc {
  font-size: 13px;
  color: var(--mid);
  line-height: 1.75;
}

/* ── INCLUDED ──────────────────────────────────────────── */
.included-section {
  padding: 80px 40px;
  border-top: 1px solid var(--border);
}

.included-section h2 {
  font-size: clamp(2.2rem, 4vw, 3rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 40px;
}

.included-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.included-visual {
  aspect-ratio: 4 / 3;
}

.kit-slot {
  width: 100%;
  height: 100%;
}

.included-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 8px;
}

.inc-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.5;
}

.inc-check {
  color: #4A7A6B;
  font-weight: 900;
  flex-shrink: 0;
  margin-top: 1px;
}

.buy-block {
  margin-top: 36px;
}

.buy-alt {
  margin-top: 14px;
  font-size: 13px;
  color: var(--mid);
}

.buy-alt a {
  color: var(--dark);
  font-weight: 700;
  text-decoration: underline;
}

/* ── FOOTER ────────────────────────────────────────────── */
.footer {
  background: var(--dark);
  padding: 52px 40px;
  text-align: center;
}

.footer-brand {
  font-size: 20px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 13px;
  color: #555;
  margin-bottom: 28px;
}

.footer-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  margin-bottom: 20px;
}

.footer-links a {
  font-size: 13px;
  color: #888;
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover { color: #fff; }

.footer-copy {
  font-size: 12px;
  color: #444;
}

/* ── RESPONSIVE ────────────────────────────────────────── */
@media (max-width: 900px) {
  .weeks-grid { grid-template-columns: repeat(2, 1fr); }
  .science-grid { grid-template-columns: repeat(2, 1fr); }
  .uc-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
  .nav { padding: 0 20px; }

  .hero {
    grid-template-columns: 1fr;
    padding: 48px 20px 40px;
    gap: 36px;
  }

  .hero-slot { aspect-ratio: 4 / 3; }

  .product-strip {
    grid-template-columns: 1fr;
    padding: 0 20px 56px;
  }

  .strip-slot { aspect-ratio: 4 / 3; }

  .problem-section { padding: 60px 20px; }
  .problem-inner { grid-template-columns: 1fr; gap: 36px; }

  .use-cases { padding: 48px 20px; }
  .uc-grid { grid-template-columns: repeat(2, 1fr); }

  .section { padding: 60px 20px; }

  .flow { flex-direction: column; gap: 12px; }
  .flow-arrow { transform: rotate(90deg); align-self: flex-start; margin-left: 16px; padding-top: 0; }
  .flow-step { min-width: unset; }

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

  .science-grid { grid-template-columns: 1fr; }

  .included-section { padding: 60px 20px; }
  .included-grid { grid-template-columns: 1fr; gap: 36px; }
  .included-visual { aspect-ratio: 4 / 3; }

  .footer { padding: 40px 20px; }
}

@media (max-width: 480px) {
  .uc-grid { grid-template-columns: 1fr 1fr; }
  .weeks-grid { grid-template-columns: 1fr; }
}