/* H2 Pure Life — Science Hub page styles */

/* ------- Hero (two-column) ------- */
.sh-hero {
  background: #EAF7F4;
  padding: clamp(72px, 10vw, 120px) 0 clamp(56px, 8vw, 96px);
  border-bottom: 1px solid var(--line);
}
.sh-hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.sh-hero__copy { text-align: left; max-width: 580px; }
.sh-hero__h1 {
  font-size: clamp(2.2rem, 4.4vw, 3.6rem);
  font-weight: 400;
  margin: 14px 0 22px;
  letter-spacing: -0.015em;
  line-height: 1.08;
}
.sh-hero__sub {
  font-size: 1.05rem;
  color: var(--ink-soft);
  line-height: 1.65;
  margin: 0 0 28px;
}
.sh-hero__cta {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 4px;
  text-decoration: none;
  transition: color var(--tx) var(--ease), border-color var(--tx) var(--ease);
}
.sh-hero__cta:hover { color: var(--teal-readable); border-bottom-color: var(--teal-readable); }
.sh-hero__cta-arrow { display: inline-block; transition: transform var(--tx) var(--ease); }
.sh-hero__cta:hover .sh-hero__cta-arrow { transform: translateX(4px); }
.sh-hero__media {
  background: url('/assets/img/pages/research/mitochondria.jpg') center / cover no-repeat, var(--dark);
  border-radius: var(--radius-lg);
  aspect-ratio: 4 / 5;
  min-height: 360px;
  box-shadow: 0 20px 50px -20px rgba(10, 31, 31, 0.25);
}
@media (max-width: 900px) {
  .sh-hero__inner { grid-template-columns: 1fr; gap: 28px; }
  .sh-hero__media {
    aspect-ratio: 4 / 5;
    min-height: 0;
    width: min(70vw, 300px);
    max-width: none;
    margin: 0 auto;
  }
}

/* ------- Stat bar (count-up) ------- */
.sh-stats {
  padding: clamp(48px, 7vw, 80px) 0;
}
.sh-stats__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.sh-stat {
  text-align: center;
  padding: 18px 22px;
  border-right: 1px solid var(--line-dark);
}
.sh-stat:last-child { border-right: 0; }
.sh-stat__num {
  display: block;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(2.6rem, 5vw, 3.8rem);
  line-height: 1;
  color: var(--white);
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  font-variant-numeric: tabular-nums;
}
.sh-stat__label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  font-weight: 500;
}
@media (max-width: 768px) {
  .sh-stats__grid { grid-template-columns: repeat(2, 1fr); }
  .sh-stat { border-bottom: 1px solid var(--line-dark); padding: 24px 16px; }
  .sh-stat:nth-child(2) { border-right: 0; }
  .sh-stat:nth-child(3),
  .sh-stat:nth-child(4) { border-bottom: 0; }
}

/* ------- Why hydrogen is different (two-column) ------- */
.sh-why__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(36px, 5vw, 72px);
  align-items: start;
}
.sh-why__copy h2 { margin: 14px 0 22px; }
.sh-why__copy p {
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.75;
  margin: 0 0 1.2em;
}
.sh-why__cards {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
}
.sh-why-card {
  position: relative;
  margin: 0;
  min-height: 540px;
  border-radius: var(--radius-lg);
  background-size: cover;
  background-position: center;
  background-color: var(--dark);
  overflow: hidden;
  display: flex;
  align-items: flex-end;
}
.sh-why-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8, 28, 28, 0) 0%, rgba(8, 28, 28, 0.2) 45%, rgba(8, 28, 28, 0.88) 100%);
  pointer-events: none;
}
.sh-why-card__cap {
  position: relative;
  z-index: 1;
  padding: 22px 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--white);
}
.sh-why-card__label {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--teal);
}
.sh-why-card__text {
  font-size: 0.92rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.92);
}
@media (max-width: 1100px) {
  .sh-why__inner { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .sh-why__cards { grid-template-columns: 1fr; gap: 14px; }
  .sh-why-card { min-height: 360px; }
}
.sh-pullquote {
  margin: 48px 0;
  padding: 28px 32px;
  border-left: 3px solid var(--teal);
  text-align: left;
  font-size: clamp(1.3rem, 2.4vw, 1.85rem);
  background: var(--cream);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.sh-pullquote__cite {
  display: block;
  margin-top: 18px;
  font-family: var(--font-sans);
  font-style: normal;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal-readable);
}

.sh-mech__sub {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 18px auto 0;
}
.sh-mech .step h3 em,
.sh-mech .step h3 {
  font-family: var(--font-serif);
}
.sh-mech .step h3 {
  font-style: italic;
  color: var(--teal-readable);
}

/* ------- Mechanism (reuse .steps) ------- */
.sh-mech .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  counter-reset: step;
}
.sh-mech .step {
  background: var(--white);
  padding: 32px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color var(--tx) var(--ease), box-shadow var(--tx) var(--ease), transform var(--tx) var(--ease);
}
.sh-mech .step:hover {
  border-color: var(--teal);
  box-shadow: 0 12px 32px rgba(10,31,31,0.06);
  transform: translateY(-2px);
}
.sh-mech .step__num {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: 2.4rem;
  color: var(--teal-readable);
  line-height: 1;
  margin-bottom: 16px;
}
.sh-mech .step h3 {
  font-size: 1.3rem;
  color: var(--teal-ink);
  margin-bottom: 12px;
}
.sh-mech .step p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 0;
}
@media (max-width: 960px) {
  .sh-mech .steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .sh-mech .steps { grid-template-columns: 1fr; }
}

/* ------- Evidence disclaimer ------- */
.sh-disclaimer { background: #FFF8F0; border-top: 1px solid #F0E2C8; border-bottom: 1px solid #F0E2C8; }
.sh-disclaimer__h {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 18px;
}
.sh-disclaimer p {
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.75;
  margin: 0;
}

/* ------- Studies — filter ------- */
.sh-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  margin: 32px 0 36px;
}
.sh-filter__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.sh-chip {
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--white);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: border-color var(--tx) var(--ease), background-color var(--tx) var(--ease), color var(--tx) var(--ease);
}
.sh-chip:hover { border-color: var(--teal-readable); color: var(--teal-readable); }
.sh-chip.is-active {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--dark);
}
.sh-chip:focus-visible {
  outline: 2px solid var(--teal-deep);
  outline-offset: 3px;
}
.sh-filter__count {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
}

/* ------- Studies — grid + cards ------- */
.studies-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 960px) { .studies-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .studies-grid { grid-template-columns: 1fr; } }

.study-card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 28px 26px;
  transition: opacity 320ms var(--ease), transform 320ms var(--ease), border-color var(--tx) var(--ease), box-shadow var(--tx) var(--ease);
}
.study-card:hover {
  border-color: var(--teal);
  box-shadow: 0 14px 34px rgba(10,31,31,0.07);
}
.study-card[hidden] {
  display: none;
}
.study-card.is-fading {
  opacity: 0;
  transform: translateY(4px);
}
.study-card__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 14px;
  gap: 12px;
}
.study-num {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: 1.8rem;
  color: var(--line);
  line-height: 1;
}
.cat-pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.66rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--white);
}
.cat-pill[data-cat="cardio"] { background: #2A8C7A; }
.cat-pill[data-cat="neurology"] { background: #5B7FA6; }
.cat-pill[data-cat="respiratory"] { background: #C47A3A; }
.cat-pill[data-cat="metabolism"] { background: #7A6BA8; }
.cat-pill[data-cat="safety"] { background: #3A8A5C; }
.cat-pill[data-cat="inflammation"] { background: #B85C5C; }

.study-journal {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal-readable);
  margin: 0 0 10px;
}
.study-label {
  color: var(--ink-mute);
  font-weight: 500;
}
.study-title {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 1.2rem;
  line-height: 1.3;
  color: var(--ink);
  margin: 0 0 10px;
}
.study-meta {
  font-size: 0.78rem;
  color: var(--ink-mute);
  margin: 0 0 14px;
  letter-spacing: 0.02em;
}
.study-desc {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.6;
  margin: 0 0 18px;
}
.study-finding {
  font-size: 0.88rem;
  color: var(--teal-ink);
  font-weight: 500;
  line-height: 1.55;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  margin: 0 0 16px;
}
.study-finding .arrow {
  color: var(--teal-readable);
  margin-right: 6px;
  font-weight: 700;
}
.study-link {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}
.study-link:hover { color: var(--teal-readable); }

/* ------- Footer CTA ------- */
.sh-cta { text-align: center; }
.sh-cta h2 { margin-bottom: 18px; }
.sh-cta p { color: var(--ink-soft); }
.sh-cta__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  margin-top: 28px;
}

/* Reveal-on-scroll cards */
.study-card { opacity: 0; transform: translateY(18px); }
.study-card.is-visible { opacity: 1; transform: none; transition: opacity 480ms var(--ease), transform 480ms var(--ease), border-color var(--tx) var(--ease), box-shadow var(--tx) var(--ease); }
@media (prefers-reduced-motion: reduce) {
  .study-card { opacity: 1; transform: none; }
}

/* ------- Quote banner (full-width dark, image-backed) ------- */
.sh-quote-banner {
  position: relative;
  /* Bottom padding shaved ~20px (max 160 → 140; min 96 → 76) so the quote
     sits visually centred now that the attribution line is gone. */
  padding: clamp(96px, 14vw, 160px) 0 clamp(76px, 12vw, 140px);
  background: var(--dark);
  overflow: hidden;
  isolation: isolate;
}
.sh-quote-banner__bg {
  position: absolute;
  inset: 0;
  background: url('/assets/img/pages/research/quote-banner-bg.jpg') center / cover no-repeat;
  z-index: 0;
}
.sh-quote-banner__scrim {
  position: absolute;
  inset: 0;
  background: rgba(8, 28, 28, 0.78);
  z-index: 1;
}
.sh-quote-banner__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 880px;
}
.sh-quote-banner__mark {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(56px, 8vw, 84px);
  line-height: 0.6;
  color: var(--teal);
  opacity: 0.9;
  margin: 0 0 10px;
  font-style: italic;
}
.sh-quote-banner__quote {
  margin: 0 0 28px;
  padding: 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.4rem, 2.6vw, 2.25rem);
  line-height: 1.45;
  color: var(--white);
  letter-spacing: -0.005em;
}
.sh-quote-banner__cite {
  font-family: var(--font-sans);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.55);
  margin: 0;
}

/* ------- Safety profile (two-column white) ------- */
.sh-safety { background: var(--white); }
.sh-safety__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(36px, 5vw, 80px);
  align-items: start;
}
.sh-safety__h2 {
  font-family: var(--font-serif);
  font-weight: 300;
  font-style: normal;
  font-size: clamp(1.9rem, 3.4vw, 2.8rem);
  margin: 14px 0 22px;
  color: var(--ink);
  line-height: 1.15;
}
.sh-safety__copy p {
  color: var(--ink-soft);
  font-size: 1.02rem;
  line-height: 1.75;
  margin: 0 0 1.2em;
}
.sh-safety__copy p em { color: var(--ink); font-style: italic; }
.sh-safety__close {
  margin-top: 22px !important;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1.05rem;
  line-height: 1.6;
}
.sh-safety__media { display: flex; flex-direction: column; gap: 18px; }
.sh-safety__img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 6px;
  background: var(--cream-2);
  display: block;
}
.sh-safety__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.sh-safety-stat {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 16px;
  text-align: center;
}
.sh-safety-stat__num {
  display: block;
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(2rem, 3.2vw, 2.6rem);
  line-height: 1;
  color: var(--ink);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.sh-safety-stat__label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
  font-weight: 500;
}
@media (max-width: 900px) {
  .sh-safety__inner { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .sh-safety__stats { grid-template-columns: 1fr; }
}