/* ============================================================
   肽活力健康科普平台 - 主样式文件
   设计风格：温暖现代、自然健康
   主色：珊瑚橙 #F97B64 / 薄荷绿 #4ECDC4 / 深靛蓝 #1A2B4A
   ============================================================ */

/* ---------- CSS Variables ---------- */
:root {
  --coral:       #F97B64;
  --coral-light: #FDE8E4;
  --coral-dark:  #E86050;
  --mint:        #4ECDC4;
  --mint-light:  #E0F7F6;
  --navy:        #1A2B4A;
  --navy-mid:    #2C3E5B;
  --text-dark:   #1E2A3A;
  --text-mid:    #4A5568;
  --text-light:  #718096;
  --bg-white:    #FFFFFF;
  --bg-soft:     #FBF7F4;
  --bg-cream:    #FEF9F6;
  --border:      #EEE8E3;
  --shadow-sm:   0 2px 8px rgba(0,0,0,.06);
  --shadow-md:   0 8px 30px rgba(0,0,0,.10);
  --shadow-lg:   0 20px 60px rgba(0,0,0,.14);
  --radius-sm:   8px;
  --radius-md:   16px;
  --radius-lg:   24px;
  --radius-xl:   36px;
  --font:        'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition:  all .3s cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  overflow-x: hidden;
}
img { display: block; width: 100%; height: 100%; object-fit: cover; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: var(--font); }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Section Base ---------- */
.section { padding: 96px 0; }
.section--white { background: var(--bg-white); }
.section--soft { background: var(--bg-soft); }
.section--dark {
  background: var(--navy);
  position: relative;
  overflow: hidden;
}
.section--dark::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(78,205,196,.12) 0%, transparent 65%),
              radial-gradient(ellipse at 20% 80%, rgba(249,123,100,.08) 0%, transparent 50%);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}
.section-header--light { color: #fff; }
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-dark);
  margin-bottom: 16px;
}
.section-title--light { color: #fff; }
.section-subtitle {
  font-size: 1rem;
  color: var(--text-mid);
  max-width: 540px;
  margin: 0 auto;
}
.section-subtitle--light { color: rgba(255,255,255,.72); }
.section-desc { font-size: 1rem; color: var(--text-mid); margin-bottom: 28px; }
.highlight { color: var(--coral); }

/* ---------- Label Tag ---------- */
.label-tag {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--coral);
  background: var(--coral-light);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.label-tag--light {
  color: #fff;
  background: rgba(255,255,255,.18);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 100px;
  font-size: .95rem;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.btn--primary {
  background: var(--coral);
  color: #fff;
  box-shadow: 0 4px 18px rgba(249,123,100,.38);
}
.btn--primary:hover {
  background: var(--coral-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(249,123,100,.46);
}
.btn--hero {
  background: var(--coral);
  color: #fff;
  font-size: 1.05rem;
  padding: 15px 36px;
  box-shadow: 0 6px 24px rgba(249,123,100,.42);
}
.btn--hero:hover {
  background: var(--coral-dark);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(249,123,100,.5);
}
.btn--ghost {
  background: rgba(255,255,255,.18);
  color: #fff;
  border: 2px solid rgba(255,255,255,.5);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover {
  background: rgba(255,255,255,.28);
  border-color: #fff;
  transform: translateY(-2px);
}
.btn--outline {
  background: transparent;
  color: var(--coral);
  border: 2px solid var(--coral);
}
.btn--outline:hover {
  background: var(--coral);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(249,123,100,.3);
}
.btn--white {
  background: #fff;
  color: var(--coral);
  font-weight: 700;
}
.btn--white:hover {
  background: var(--coral-light);
  transform: translateY(-2px);
}
.btn--sm { padding: 9px 20px; font-size: .875rem; }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: var(--transition);
  background: transparent;
}
.navbar.scrolled {
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(16px);
  box-shadow: 0 2px 20px rgba(0,0,0,.08);
}
.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: 32px;
}
.navbar__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.4rem;
  font-weight: 900;
  color: #fff;
  transition: var(--transition);
}
.navbar.scrolled .navbar__logo { color: var(--navy); }
.logo-icon { color: var(--coral); font-size: 1.1rem; }

.navbar__menu {
  display: flex;
  gap: 36px;
  flex: 1;
  justify-content: center;
}
.navbar__menu a {
  font-size: .92rem;
  font-weight: 500;
  color: rgba(255,255,255,.88);
  position: relative;
  transition: var(--transition);
}
.navbar__menu a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 2px;
  background: var(--coral);
  border-radius: 2px;
  transition: width .3s ease;
}
.navbar__menu a:hover { color: #fff; }
.navbar__menu a:hover::after { width: 100%; }
.navbar.scrolled .navbar__menu a { color: var(--text-mid); }
.navbar.scrolled .navbar__menu a:hover { color: var(--coral); }

.navbar__cta { padding: 10px 22px; font-size: .88rem; }
.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.navbar__hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
}
.navbar.scrolled .navbar__hamburger span { background: var(--navy); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
}
.hero__bg img { object-position: center top; }
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26,43,74,.78) 0%,
    rgba(26,43,74,.55) 50%,
    rgba(249,123,100,.25) 100%
  );
}
.hero__content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  padding: 140px 24px 80px;
  color: #fff;
}
.hero__tag {
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--coral);
  background: rgba(249,123,100,.18);
  border: 1px solid rgba(249,123,100,.4);
  padding: 6px 16px;
  border-radius: 100px;
  display: inline-block;
  margin-bottom: 24px;
}
.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  color: #fff;
}
.hero__title em {
  font-style: normal;
  color: var(--coral);
}
.hero__desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,.82);
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 56px;
}
.hero__stats {
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.hero__stat {
  display: flex;
  flex-direction: column;
}
.hero__stat strong {
  font-size: 2rem;
  font-weight: 900;
  color: #fff;
  line-height: 1;
}
.hero__stat span {
  font-size: .82rem;
  color: rgba(255,255,255,.65);
  margin-top: 4px;
}
.hero__stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,.25);
}
.hero__scroll-hint {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: rgba(255,255,255,.6);
  font-size: .78rem;
  letter-spacing: .08em;
  animation: bounceDown 2s infinite;
  z-index: 2;
}
@keyframes bounceDown {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   WHAT SPECIAL
   ============================================================ */
.what-special {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.what-special__text .section-title { text-align: left; margin-bottom: 16px; }
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0 32px;
}
.feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .95rem;
  color: var(--text-mid);
}
.feature-list li i {
  color: var(--mint);
  font-size: 1rem;
  flex-shrink: 0;
}

/* Molecule Animation */
.what-special__visual { display: flex; justify-content: center; align-items: center; }
.molecule-card {
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle at center, var(--coral-light) 0%, rgba(78,205,196,.1) 60%, transparent 80%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.molecule-animation { position: relative; width: 280px; height: 280px; }
.mol-ring {
  position: absolute;
  border: 2px dashed rgba(249,123,100,.25);
  border-radius: 50%;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  animation: rotateSlow linear infinite;
}
.mol-ring--1 { width: 80px; height: 80px; animation-duration: 8s; border-color: rgba(249,123,100,.4); }
.mol-ring--2 { width: 160px; height: 160px; animation-duration: 14s; animation-direction: reverse; }
.mol-ring--3 { width: 240px; height: 240px; animation-duration: 20s; border-color: rgba(78,205,196,.3); }
@keyframes rotateSlow { to { transform: translate(-50%, -50%) rotate(360deg); } }

.mol-center {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 60px; height: 60px;
  background: linear-gradient(135deg, var(--coral), #FF9A8B);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
  box-shadow: 0 8px 24px rgba(249,123,100,.4);
  z-index: 3;
  animation: pulse 3s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 8px 24px rgba(249,123,100,.4), 0 0 0 0 rgba(249,123,100,.3); }
  50% { box-shadow: 0 8px 24px rgba(249,123,100,.4), 0 0 0 14px rgba(249,123,100,0); }
}
.mol-node {
  position: absolute;
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 100px;
  padding: 5px 12px;
  font-size: .73rem;
  font-weight: 600;
  color: var(--text-mid);
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  z-index: 2;
}
.mol-node--1 { top: 0; left: 50%; transform: translateX(-50%); }
.mol-node--2 { top: 50%; right: 0; transform: translateY(-50%); }
.mol-node--3 { bottom: 0; left: 50%; transform: translateX(-50%); }
.mol-node--4 { top: 50%; left: 0; transform: translateY(-50%); }

/* ============================================================
   BENEFITS
   ============================================================ */
.benefits-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 24px;
}
.benefit-card--large {
  grid-column: 1;
  grid-row: 1 / 3;
}
.benefit-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.benefit-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.benefit-card__img {
  overflow: hidden;
  position: relative;
}
.benefit-card--large .benefit-card__img { height: 240px; }
.benefit-card:not(.benefit-card--large) .benefit-card__img { height: 160px; }
.benefit-card__img img { transition: transform .5s ease; }
.benefit-card:hover .benefit-card__img img { transform: scale(1.05); }
.benefit-card__body {
  padding: 24px;
}
.benefit-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px; height: 42px;
  background: var(--coral-light);
  border-radius: 50%;
  color: var(--coral);
  font-size: 1rem;
  margin-bottom: 12px;
}
.benefit-card__body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-dark);
}
.benefit-card__body p {
  font-size: .875rem;
  color: var(--text-mid);
  line-height: 1.7;
}

/* ============================================================
   LIFESTYLE
   ============================================================ */
.lifestyle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.lifestyle-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.lifestyle-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-md);
}
.lifestyle-card__img {
  position: relative;
  height: 220px;
  overflow: hidden;
}
.lifestyle-card__img img { transition: transform .5s ease; }
.lifestyle-card:hover .lifestyle-card__img img { transform: scale(1.06); }
.lifestyle-card__badge {
  position: absolute;
  top: 16px; left: 16px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-radius: 100px;
  padding: 5px 12px;
  font-size: .78rem;
  font-weight: 600;
  color: var(--text-dark);
  box-shadow: var(--shadow-sm);
}
.lifestyle-card h3 {
  padding: 20px 20px 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-dark);
}
.lifestyle-card p {
  padding: 0 20px 24px;
  font-size: .875rem;
  color: var(--text-mid);
  line-height: 1.7;
}

/* ============================================================
   SCIENCE
   ============================================================ */
.science-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.science-steps { display: flex; flex-direction: column; gap: 0; }
.science-step {
  display: flex;
  gap: 20px;
  padding: 28px;
  background: rgba(255,255,255,.06);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,.1);
  transition: var(--transition);
}
.science-step:hover {
  background: rgba(255,255,255,.1);
  border-color: rgba(249,123,100,.4);
  transform: translateX(6px);
}
.science-connector {
  width: 2px;
  height: 24px;
  background: linear-gradient(to bottom, rgba(249,123,100,.5), rgba(78,205,196,.5));
  margin-left: 48px;
}
.science-step__icon {
  flex-shrink: 0;
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--coral), #FF9A8B);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: #fff;
  box-shadow: 0 4px 16px rgba(249,123,100,.4);
}
.science-step__content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}
.science-step__content p {
  font-size: .875rem;
  color: rgba(255,255,255,.7);
  line-height: 1.7;
}
.science-step__content strong { color: var(--coral); }

/* Science Infographic */
.science-visual { display: flex; justify-content: center; align-items: center; }
.science-infographic {
  position: relative;
  width: 380px;
  height: 380px;
}
.sci-center {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 100px; height: 100px;
  background: linear-gradient(135deg, var(--coral), #FF9A8B);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 16px rgba(249,123,100,.12), 0 0 0 32px rgba(249,123,100,.06);
  z-index: 3;
}
.sci-center span {
  font-size: 1.6rem;
  font-weight: 900;
  color: #fff;
}
.sci-center small {
  font-size: .65rem;
  color: rgba(255,255,255,.8);
  margin-top: 2px;
}
.sci-orbit { position: absolute; inset: 0; }
.sci-item {
  position: absolute;
  top: 50%; left: 50%;
  --r: 150px;
  transform:
    translate(-50%, -50%)
    rotate(var(--angle))
    translateY(calc(-1 * var(--r)))
    rotate(calc(-1 * var(--angle)));
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  animation: orbitFloat 6s ease-in-out infinite;
}
.sci-item:nth-child(2) { animation-delay: -1s; }
.sci-item:nth-child(3) { animation-delay: -2s; }
.sci-item:nth-child(4) { animation-delay: -3s; }
.sci-item:nth-child(5) { animation-delay: -4s; }
@keyframes orbitFloat {
  0%, 100% { transform:
    translate(-50%, -50%)
    rotate(var(--angle))
    translateY(calc(-1 * var(--r)))
    rotate(calc(-1 * var(--angle)))
    translateY(0); }
  50% { transform:
    translate(-50%, -50%)
    rotate(var(--angle))
    translateY(calc(-1 * var(--r) - 6px))
    rotate(calc(-1 * var(--angle)))
    translateY(0); }
}
.sci-item i {
  width: 44px; height: 44px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  color: var(--mint);
  backdrop-filter: blur(8px);
}
.sci-item span {
  font-size: .68rem;
  color: rgba(255,255,255,.75);
  font-weight: 500;
  white-space: nowrap;
}

/* ============================================================
   TESTIMONIALS
   ============================================================ */
.testimonials-slider {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
}
.testimonials-track {
  display: flex;
  transition: transform .5s cubic-bezier(.4,0,.2,1);
}
.testimonial-card {
  flex: 0 0 calc(33.333% - 16px);
  margin-right: 24px;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.testimonial-card__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}
.testimonial-avatar {
  width: 56px; height: 56px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 2px solid var(--coral-light);
}
.testimonial-card__header h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-dark);
}
.testimonial-card__header p {
  font-size: .8rem;
  color: var(--text-light);
  margin-top: 2px;
}
.testimonial-stars {
  color: #F6B73C;
  font-size: 1rem;
  letter-spacing: 2px;
  margin-bottom: 12px;
}
.testimonial-text {
  font-size: .9rem;
  color: var(--text-mid);
  line-height: 1.8;
  font-style: italic;
}
.testimonial-text::before { content: '"'; color: var(--coral); font-size: 1.5rem; }

.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px; height: 44px;
  background: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-mid);
  font-size: .9rem;
  z-index: 10;
  transition: var(--transition);
}
.slider-btn:hover { background: var(--coral); color: #fff; transform: translateY(-50%) scale(1.1); }
.slider-btn--prev { left: -20px; }
.slider-btn--next { right: -20px; }

.slider-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding-top: 28px;
}
.slider-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: var(--transition);
}
.slider-dot.active {
  background: var(--coral);
  width: 24px;
  border-radius: 4px;
}

/* ============================================================
   POPULAR READS
   ============================================================ */
.reads-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 24px;
}
.read-card--featured {
  grid-column: 1;
  grid-row: 1 / 3;
}
.read-card {
  background: #fff;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}
.read-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}
.read-card__img {
  position: relative;
  overflow: hidden;
}
.read-card--featured .read-card__img { height: 260px; }
.read-card:not(.read-card--featured) .read-card__img { height: 160px; }
.read-card__img img { transition: transform .5s ease; }
.read-card:hover .read-card__img img { transform: scale(1.05); }
.read-card__tag {
  position: absolute;
  top: 14px; left: 14px;
  background: var(--coral);
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 100px;
  letter-spacing: .05em;
}
.read-card__body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.read-card--featured .read-card__body h3 { font-size: 1.25rem; }
.read-card__body h3 {
  font-size: .95rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 10px;
  line-height: 1.5;
}
.read-card__body p {
  font-size: .85rem;
  color: var(--text-mid);
  line-height: 1.7;
  flex: 1;
}
.read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--coral);
  margin-top: 16px;
  transition: var(--transition);
}
.read-more:hover { gap: 10px; color: var(--coral-dark); }
.reads-more {
  text-align: center;
  margin-top: 48px;
}

/* ============================================================
   FAQ
   ============================================================ */
.faq-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 80px;
  align-items: start;
}
.faq-header .section-title { text-align: left; font-size: 2rem; }
.faq-header .btn { margin-top: 32px; }

.faq-item {
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  overflow: hidden;
  margin-bottom: 12px;
  transition: var(--transition);
}
.faq-item.active { border-color: var(--coral); box-shadow: 0 4px 16px rgba(249,123,100,.12); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: .95rem;
  font-weight: 600;
  color: var(--text-dark);
  text-align: left;
  gap: 16px;
}
.faq-icon {
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: var(--bg-soft);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  color: var(--coral);
  transition: var(--transition);
}
.faq-item.active .faq-icon {
  background: var(--coral);
  color: #fff;
  transform: rotate(45deg);
}
.faq-answer {
  display: none;
  padding: 0 24px 20px;
}
.faq-item.active .faq-answer { display: block; }
.faq-answer p {
  font-size: .9rem;
  color: var(--text-mid);
  line-height: 1.8;
}

/* ============================================================
   NEWSLETTER
   ============================================================ */
.newsletter {
  padding: 0;
  position: relative;
  overflow: hidden;
}
.newsletter__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--coral) 0%, #FF9A8B 40%, #FFB347 100%);
}
.newsletter__bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(255,255,255,.15) 0%, transparent 40%),
    radial-gradient(circle at 20% 80%, rgba(255,255,255,.1) 0%, transparent 40%);
}
.newsletter__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: center;
  padding-top: 80px;
  padding-bottom: 80px;
}
.newsletter__content h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 14px;
}
.newsletter__content > p {
  font-size: 1rem;
  color: rgba(255,255,255,.85);
  margin-bottom: 32px;
}
.newsletter__form { max-width: 540px; }
.newsletter__input-group {
  display: flex;
  gap: 12px;
  background: rgba(255,255,255,.2);
  border-radius: 100px;
  padding: 6px 6px 6px 20px;
  border: 1.5px solid rgba(255,255,255,.35);
  backdrop-filter: blur(10px);
}
.newsletter__input-group input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: .95rem;
  color: #fff;
  font-family: var(--font);
}
.newsletter__input-group input::placeholder { color: rgba(255,255,255,.65); }
.newsletter__tips {
  font-size: .78rem;
  color: rgba(255,255,255,.65);
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.newsletter__success {
  display: none;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,.2);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: #fff;
  font-weight: 600;
  margin-top: 16px;
  border: 1.5px solid rgba(255,255,255,.35);
}
.newsletter__success i { font-size: 1.2rem; }
.newsletter__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  min-width: 260px;
}
.nl-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,.15);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  color: #fff;
  font-size: .88rem;
  font-weight: 500;
  border: 1px solid rgba(255,255,255,.2);
  backdrop-filter: blur(8px);
}
.nl-feature i { font-size: 1rem; color: rgba(255,255,255,.9); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--navy);
  color: rgba(255,255,255,.75);
}
.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-top: 72px;
  padding-bottom: 56px;
}
.footer__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.4rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 16px;
}
.footer__brand p {
  font-size: .875rem;
  line-height: 1.8;
  margin-bottom: 24px;
  color: rgba(255,255,255,.6);
}
.footer__social {
  display: flex;
  gap: 12px;
}
.footer__social a {
  width: 38px; height: 38px;
  background: rgba(255,255,255,.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .95rem;
  color: rgba(255,255,255,.7);
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,.1);
}
.footer__social a:hover { background: var(--coral); color: #fff; border-color: var(--coral); }

.footer__links h4 {
  font-size: .95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}
.footer__links ul { display: flex; flex-direction: column; gap: 10px; }
.footer__links ul li a {
  font-size: .875rem;
  color: rgba(255,255,255,.6);
  transition: var(--transition);
}
.footer__links ul li a:hover { color: var(--coral); padding-left: 4px; }

.footer__contact h4 {
  font-size: .95rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}
.footer__form {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer__form input,
.footer__form textarea {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: .875rem;
  color: #fff;
  font-family: var(--font);
  outline: none;
  transition: var(--transition);
}
.footer__form input:focus,
.footer__form textarea:focus { border-color: var(--coral); background: rgba(255,255,255,.12); }
.footer__form input::placeholder,
.footer__form textarea::placeholder { color: rgba(255,255,255,.35); }
.footer__form textarea { resize: none; height: 80px; }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.1);
}
.footer__bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.footer__bottom p { font-size: .82rem; color: rgba(255,255,255,.45); }
.footer__bottom-links {
  display: flex;
  gap: 20px;
}
.footer__bottom-links a {
  font-size: .82rem;
  color: rgba(255,255,255,.45);
  transition: var(--transition);
}
.footer__bottom-links a:hover { color: var(--coral); }

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px; height: 48px;
  background: var(--coral);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: .9rem;
  box-shadow: 0 6px 20px rgba(249,123,100,.4);
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}
.back-to-top:hover { transform: translateY(-4px); background: var(--coral-dark); }

/* ============================================================
   ANIMATIONS / REVEAL
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }

/* ============================================================
   RESPONSIVE - Tablet
   ============================================================ */
@media (max-width: 1024px) {
  .what-special { grid-template-columns: 1fr; gap: 40px; }
  .what-special__visual { order: -1; }
  .molecule-card { width: 300px; height: 300px; }
  .benefits-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
  }
  .benefit-card--large { grid-column: 1; grid-row: 1; }
  .lifestyle-grid { grid-template-columns: 1fr 1fr; }
  .lifestyle-card:last-child { grid-column: 1 / -1; }
  .science-layout { grid-template-columns: 1fr; gap: 48px; }
  .science-visual { order: -1; }
  .reads-grid { grid-template-columns: 1fr; }
  .read-card--featured { grid-column: 1; grid-row: 1; }
  .faq-layout { grid-template-columns: 1fr; gap: 40px; }
  .newsletter__inner { grid-template-columns: 1fr; gap: 40px; }
  .newsletter__features { grid-template-columns: repeat(4, 1fr); }
  .footer__inner { grid-template-columns: 1fr 1fr; gap: 36px; }
}

/* ============================================================
   RESPONSIVE - Mobile
   ============================================================ */
@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .navbar__menu { display: none; }
  .navbar__menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(16px);
    padding: 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }
  .navbar__menu.open a {
    color: var(--text-dark);
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
  }
  .navbar__menu.open a:hover { background: var(--bg-soft); color: var(--coral); }
  .navbar__hamburger { display: flex; }
  .navbar__cta { display: none; }
  .hero__content { padding: 120px 24px 60px; }
  .hero__actions { flex-direction: column; }
  .hero__stats { gap: 16px; }
  .hero__stat strong { font-size: 1.5rem; }
  .what-special__text .section-title { font-size: 1.8rem; }
  .molecule-card { width: 240px; height: 240px; }
  .mol-ring--3 { width: 200px; height: 200px; }
  .benefits-grid { grid-template-columns: 1fr; }
  .benefit-card--large { grid-column: 1; grid-row: 1; }
  .lifestyle-grid { grid-template-columns: 1fr; }
  .lifestyle-card:last-child { grid-column: 1; }
  .science-infographic { width: 280px; height: 280px; }
  .sci-item { --r: 110px; }
  .reads-grid { grid-template-columns: 1fr; }
  .testimonial-card { flex: 0 0 100%; margin-right: 0; }
  .slider-btn--prev { left: 8px; }
  .slider-btn--next { right: 8px; }
  .faq-layout { grid-template-columns: 1fr; }
  .faq-header .section-title { font-size: 1.7rem; }
  .newsletter__inner { grid-template-columns: 1fr; padding-top: 56px; padding-bottom: 56px; }
  .newsletter__input-group { flex-direction: column; border-radius: var(--radius-md); padding: 12px; gap: 8px; }
  .newsletter__input-group input { padding: 8px 8px; }
  .newsletter__features { grid-template-columns: 1fr 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom-inner { flex-direction: column; align-items: center; text-align: center; }
  .back-to-top { bottom: 20px; right: 20px; width: 42px; height: 42px; }
}

@media (max-width: 480px) {
  .section-title { font-size: 1.6rem; }
  .hero__title { font-size: 2rem; }
  .molecule-card { width: 200px; height: 200px; }
  .mol-ring--2 { width: 130px; height: 130px; }
  .mol-ring--3 { display: none; }
  .nl-feature span { font-size: .78rem; }
  .newsletter__features { grid-template-columns: 1fr 1fr; gap: 10px; }
}