/* ============================================================
   长庚抗衰官网 · 全局样式
   东方雅致奢华风格
   ============================================================ */

/* ---------- CSS 变量 ---------- */
:root {
  --ink: #0f1a14;
  --forest: #1a3c2e;
  --jade: #2d5a3d;
  --gold: #c9a86a;
  --gold-light: #e0c896;
  --gold-dark: #a8854a;
  --sakura: #e8b4b8;
  --cream: #faf7f0;
  --ivory: #f5f0e6;
  --text-dark: #2a2a2a;
  --text-mid: #5a5a5a;
  --text-light: rgba(250, 247, 240, 0.78);
  --text-light-dim: rgba(250, 247, 240, 0.55);

  --serif: "Noto Serif SC", "Cormorant Garamond", serif;
  --sans: "Noto Sans SC", system-ui, -apple-system, sans-serif;

  --container: 1200px;
  --radius: 10px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- 重置 ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--sans);
  font-weight: 300;
  color: var(--text-dark);
  background: var(--cream);
  line-height: 1.8;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; }
em { font-style: normal; color: var(--gold-dark); font-weight: 500; }

/* ---------- 容器 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 32px; }

/* ============================================================
   导航栏
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 0;
  transition: background 0.4s var(--ease), padding 0.4s var(--ease), border-color 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(15, 26, 20, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 12px 0;
  border-bottom-color: rgba(201, 168, 106, 0.25);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; }
.nav__logo { display: flex; align-items: center; }
.nav__logo-img { height: 72px; width: auto; display: block; }
.nav__links { display: flex; gap: 38px; position: relative; }
.nav__indicator {
  position: absolute; bottom: -8px; left: 0; height: 1.5px; width: 0;
  background: linear-gradient(90deg, var(--gold), var(--gold-light));
  border-radius: 2px; opacity: 0; pointer-events: none;
  transition: transform 0.45s var(--ease), width 0.45s var(--ease), opacity 0.3s;
}
.nav__link {
  font-size: 14px; color: rgba(250, 247, 240, 0.7); font-weight: 400;
  position: relative; padding: 4px 0; transition: color 0.4s var(--ease);
  letter-spacing: 1px;
}
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--gold); transition: width 0.3s var(--ease);
}
.nav__link:hover { color: var(--cream); }
.nav__link:hover::after { width: 100%; }
.nav__link.is-active { color: var(--gold-light); }
.nav__burger {
  display: none; flex-direction: column; gap: 5px; background: none; border: none;
  cursor: pointer; padding: 6px;
}
.nav__burger span {
  width: 24px; height: 1.5px; background: var(--cream); transition: 0.3s var(--ease);
}
.nav.is-open .nav__burger span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav.is-open .nav__burger span:nth-child(2) { opacity: 0; }
.nav.is-open .nav__burger span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ============================================================
   首屏 Hero
   ============================================================ */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  justify-content: center; overflow: hidden;
  background: var(--ink);
}
.hero__bg {
  position: absolute; inset: 0; will-change: transform;
  background:
    radial-gradient(circle at 70% 30%, rgba(201, 168, 106, 0.18), transparent 50%),
    radial-gradient(circle at 25% 75%, rgba(45, 90, 61, 0.5), transparent 55%),
    linear-gradient(160deg, #0f1a14 0%, #1a3c2e 60%, #0f1a14 100%);
}
.hero__bg::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(201, 168, 106, 0.04) 0%, transparent 1px),
    radial-gradient(circle at 80% 60%, rgba(201, 168, 106, 0.04) 0%, transparent 1px);
  background-size: 3px 3px, 4px 4px;
  opacity: 0.6;
}
.hero__petals { position: absolute; inset: 0; pointer-events: none; }
.petal {
  position: absolute; width: 28px; height: 28px; fill: var(--sakura);
  opacity: 0.18; will-change: transform;
  animation: float 14s ease-in-out infinite;
}
.petal--1 { top: 18%; left: 12%; animation-delay: 0s; }
.petal--2 { top: 65%; left: 8%; width: 20px; animation-delay: -3s; }
.petal--3 { top: 30%; right: 14%; width: 24px; fill: var(--gold); opacity: 0.12; animation-delay: -6s; }
.petal--4 { top: 75%; right: 18%; width: 18px; animation-delay: -9s; }
.petal--5 { top: 50%; left: 48%; width: 16px; fill: var(--gold-light); opacity: 0.1; animation-delay: -12s; }
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(180deg); }
}
.hero__content { position: relative; z-index: 2; text-align: center; }
.hero__eyebrow {
  font-size: 14px; letter-spacing: 6px; color: var(--gold);
  margin-bottom: 28px; font-weight: 400; text-transform: uppercase;
}
.hero__title {
  font-family: var(--serif); font-weight: 500; font-size: clamp(40px, 7vw, 84px);
  color: var(--cream); letter-spacing: 8px; line-height: 1.3; margin-bottom: 24px;
}
.hero__dot { color: var(--gold); margin: 0 16px; }
.hero__subtitle {
  font-size: clamp(14px, 1.6vw, 18px); color: var(--text-light);
  letter-spacing: 2px; margin-bottom: 48px; font-weight: 300;
}
.hero__cta { display: flex; gap: 20px; justify-content: center; }
.hero__scroll {
  position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%);
  width: 2px; height: 50px; z-index: 2;
}
.hero__scroll-line {
  display: block; width: 100%; height: 100%;
  background: linear-gradient(var(--gold), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 38px; font-size: 14px; letter-spacing: 2px; font-weight: 400;
  border-radius: 50px; transition: all 0.35s var(--ease); cursor: pointer;
  border: 1px solid transparent;
}
.btn--gold {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 100%);
  color: var(--ink); font-weight: 500;
  box-shadow: 0 4px 24px rgba(201, 168, 106, 0.35);
}
.btn--gold:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(201, 168, 106, 0.5); }
.btn--ghost {
  background: transparent; color: var(--cream); border-color: rgba(250, 247, 240, 0.3);
}
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }

/* ============================================================
   区块通用
   ============================================================ */
.section { padding: 120px 0; position: relative; }
.section--light { background: var(--cream); color: var(--text-dark); }
.section--cream { background: var(--ivory); color: var(--text-dark); }
.section--dark { background: var(--forest); color: var(--cream); }
.section--dark::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(circle at 80% 10%, rgba(201, 168, 106, 0.1), transparent 45%),
    radial-gradient(circle at 15% 85%, rgba(45, 90, 61, 0.6), transparent 50%);
}
.section--ink { background: var(--ink); color: var(--cream); }

.section__head { text-align: center; margin-bottom: 72px; }
.section__num {
  display: block; font-family: var(--serif); font-size: 13px; letter-spacing: 4px;
  color: var(--gold); margin-bottom: 16px; font-weight: 400;
}
.section__title {
  font-family: var(--serif); font-weight: 500; font-size: clamp(28px, 4vw, 40px);
  letter-spacing: 4px; margin-bottom: 24px;
}
.section__divider {
  width: 120px; height: 20px; margin: 0 auto; color: var(--gold);
}
.section--dark .section__divider { color: var(--gold-light); }
.section--ink .section__divider { color: var(--gold); }

.subhead {
  font-family: var(--serif); font-weight: 500; font-size: clamp(20px, 2.6vw, 26px);
  text-align: center; letter-spacing: 3px; margin: 80px 0 24px;
  position: relative; color: inherit;
}
.subhead::before, .subhead::after {
  content: ""; display: inline-block; width: 30px; height: 1px;
  background: var(--gold); vertical-align: middle; margin: 0 16px;
}
.section--dark .subhead::before, .section--dark .subhead::after { background: var(--gold-light); }

/* ============================================================
   公司概况
   ============================================================ */
.company { display: grid; grid-template-columns: 1.4fr 1fr; gap: 64px; align-items: center; }
.company__lead {
  font-family: var(--serif); font-size: clamp(18px, 2vw, 22px); line-height: 1.9;
  color: var(--forest); font-weight: 500; margin-bottom: 24px;
}
.company__mission {
  position: relative;
  font-family: var(--serif); font-size: clamp(19px, 2.1vw, 24px); line-height: 2;
  color: var(--forest); font-weight: 600; letter-spacing: 0.5px;
  padding: 26px 30px 26px 34px; margin-bottom: 32px;
  background: linear-gradient(135deg, rgba(201, 168, 106, 0.10) 0%, rgba(224, 200, 150, 0.04) 100%);
  border-left: 4px solid; border-image: linear-gradient(180deg, var(--gold-dark), var(--gold-light)) 1;
  border-radius: 0 10px 10px 0;
  box-shadow: 0 6px 24px rgba(26, 60, 46, 0.06);
}
.company__mission em { color: var(--gold-dark); font-weight: 700; font-style: normal; }
.company__text p { margin-bottom: 18px; color: var(--text-mid); font-size: 15px; }
.company__text p:last-child { margin-bottom: 0; }
.company__cards { display: flex; flex-direction: column; gap: 18px; }
.stat-card {
  background: #fff; border: 1px solid rgba(201, 168, 106, 0.25);
  border-radius: var(--radius); padding: 30px 36px; text-align: center;
  transition: transform 0.35s var(--ease), box-shadow 0.35s;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(15, 26, 20, 0.08); }
.stat-card__num {
  display: block; font-family: var(--serif); font-weight: 300; font-size: 40px;
  color: var(--gold-dark); line-height: 1; margin-bottom: 8px; letter-spacing: 2px;
}
.stat-card__label { font-size: 13px; color: var(--text-mid); letter-spacing: 2px; }

/* ============================================================
   科研背景
   ============================================================ */
.research__lead {
  font-family: var(--serif); font-weight: 500; text-align: center;
  font-size: clamp(20px, 2.4vw, 24px); color: var(--forest); margin-bottom: 24px; letter-spacing: 2px;
}
.research__desc {
  max-width: 820px; margin: 0 auto 64px; text-align: center;
  color: var(--text-mid); font-size: 15px; line-height: 2;
}
.research__grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.stat-block {
  text-align: center; padding: 40px 20px;
  background: #fff; border-radius: var(--radius);
  border: 1px solid rgba(201, 168, 106, 0.18);
  transition: transform 0.35s var(--ease), border-color 0.35s;
}
.stat-block:hover { transform: translateY(-4px); border-color: var(--gold); }
.stat-block__num {
  display: block; font-family: var(--serif); font-weight: 300; font-size: 44px;
  color: var(--gold-dark); line-height: 1; margin-bottom: 14px; letter-spacing: 1px;
}
.stat-block__label { font-size: 13px; color: var(--text-mid); letter-spacing: 1.5px; line-height: 1.6; }

/* ============================================================
   核心技术 NAA4.0
   ============================================================ */
.tech__intro {
  max-width: 860px; margin: 0 auto 20px; text-align: center;
  color: var(--text-light); font-size: 15px; line-height: 2;
}
.tech__sub {
  text-align: center; color: var(--text-light-dim); font-size: 14px;
  margin-bottom: 48px; letter-spacing: 1px;
}

/* 技术原理 三重机制 */
.mechanism {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
  margin-bottom: 20px;
}
.mechanism__card {
  background: rgba(250, 247, 240, 0.05); border: 1px solid rgba(201, 168, 106, 0.2);
  border-radius: var(--radius); padding: 44px 32px; text-align: center;
  transition: all 0.4s var(--ease); backdrop-filter: blur(4px);
}
.mechanism__card:hover {
  border-color: var(--gold); background: rgba(201, 168, 106, 0.08); transform: translateY(-6px);
}
.mechanism__icon {
  width: 48px; height: 48px; margin: 0 auto 24px; color: var(--gold);
}
.mechanism__name {
  font-family: var(--serif); font-weight: 500; font-size: 20px;
  color: var(--cream); margin-bottom: 14px; letter-spacing: 2px;
}
.mechanism__desc { font-size: 14px; color: var(--text-light-dim); line-height: 1.9; }

/* 技术亮点 */
.highlights {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 20px;
}
.highlight {
  background: rgba(250, 247, 240, 0.04); border: 1px solid rgba(201, 168, 106, 0.18);
  border-radius: var(--radius); padding: 36px 32px; position: relative;
  transition: all 0.4s var(--ease);
}
.highlight:hover { border-color: rgba(201, 168, 106, 0.5); transform: translateY(-4px); }
.highlight--wide { grid-column: 1 / -1; }
.highlight__no {
  font-family: var(--serif); font-size: 13px; color: var(--gold); letter-spacing: 3px;
}
.highlight__name {
  font-family: var(--serif); font-weight: 500; font-size: 18px;
  color: var(--cream); margin: 12px 0 12px; letter-spacing: 1.5px;
}
.highlight__desc { font-size: 14px; color: var(--text-light-dim); line-height: 1.9; margin-bottom: 16px; }
.highlight__desc strong { color: var(--gold-light); font-weight: 500; }
.highlight__tag {
  display: inline-block; font-size: 12px; color: var(--gold);
  border: 1px solid rgba(201, 168, 106, 0.35); border-radius: 50px;
  padding: 4px 16px; letter-spacing: 1px;
}
.zero-grid { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.zero {
  font-size: 13px; color: var(--gold-light); letter-spacing: 1.5px;
  padding: 6px 16px; border: 1px solid rgba(201, 168, 106, 0.3); border-radius: 50px;
  background: rgba(201, 168, 106, 0.05);
}

/* 核心功效 */
.effects {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.effect {
  text-align: center; padding: 36px 20px;
  border: 1px solid rgba(201, 168, 106, 0.2); border-radius: var(--radius);
  background: rgba(250, 247, 240, 0.03); transition: all 0.4s var(--ease);
}
.effect:hover { border-color: var(--gold); transform: translateY(-4px); }
.effect__icon { width: 40px; height: 40px; margin: 0 auto 18px; color: var(--gold); }
.effect__name {
  display: block; font-family: var(--serif); font-weight: 500; font-size: 17px;
  color: var(--cream); margin-bottom: 10px; letter-spacing: 1.5px;
}
.effect__desc { font-size: 13px; color: var(--text-light-dim); line-height: 1.8; }

/* ============================================================
   产品
   ============================================================ */
.product { display: grid; grid-template-columns: 1fr 1.3fr; gap: 60px; align-items: center; }

/* 产品瓶视觉（纯CSS） */
.product__visual {
  position: relative; display: flex; align-items: center; justify-content: center;
  min-height: 460px; border-radius: 16px; overflow: hidden;
  background:
    radial-gradient(circle at 50% 40%, rgba(201, 168, 106, 0.15), transparent 60%),
    linear-gradient(160deg, var(--forest) 0%, var(--ink) 100%);
}
.product__bottle {
  position: relative; width: 140px; height: 320px; z-index: 2;
}
.product__bottle-body {
  position: absolute; bottom: 0; left: 0; right: 0; height: 280px;
  background: linear-gradient(180deg, rgba(250, 247, 240, 0.95), rgba(245, 240, 230, 0.85));
  border-radius: 18px 18px 10px 10px;
  border: 1px solid rgba(201, 168, 106, 0.4);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 0 16px;
  box-shadow: inset 2px 0 12px rgba(255,255,255,0.4), 0 12px 40px rgba(0,0,0,0.35);
}
.product__bottle-cn {
  font-family: var(--serif); font-weight: 600; font-size: 26px;
  color: var(--forest); letter-spacing: 6px; margin-bottom: 10px;
}
.product__bottle-sub {
  font-size: 11px; color: var(--gold-dark); letter-spacing: 2px; margin-bottom: 8px;
}
.product__bottle-en {
  font-size: 8px; color: var(--text-mid); letter-spacing: 2px;
}
.product__bottle-cap {
  position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 56px; height: 40px;
  background: linear-gradient(180deg, var(--gold-light), var(--gold), var(--gold-dark));
  border-radius: 6px 6px 4px 4px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.product__bottle-glow {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 200px; height: 200px; border-radius: 50%; will-change: transform, opacity;
  background: radial-gradient(circle, rgba(201, 168, 106, 0.25), transparent 70%);
  z-index: 1; animation: glow 4s ease-in-out infinite;
}
@keyframes glow {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 1; transform: translate(-50%, -50%) scale(1.15); }
}
.product__petals { position: absolute; inset: 0; pointer-events: none; }
.pp { position: absolute; width: 24px; height: 24px; fill: var(--sakura); opacity: 0.25; }
.pp--1 { top: 15%; left: 18%; animation: float 12s ease-in-out infinite; }
.pp--2 { bottom: 20%; right: 16%; width: 18px; fill: var(--gold); opacity: 0.2; animation: float 15s ease-in-out infinite -5s; }
.pp--3 { top: 60%; left: 12%; width: 16px; animation: float 10s ease-in-out infinite -8s; }

/* 产品信息 */
.product__name {
  font-family: var(--serif); font-weight: 500; font-size: clamp(24px, 3vw, 32px);
  color: var(--forest); letter-spacing: 3px; margin-bottom: 12px;
}
.product__name .muted { color: var(--gold); margin: 0 8px; }
.product__pos { font-size: 14px; color: var(--text-mid); margin-bottom: 32px; letter-spacing: 1px; }

.patent {
  display: flex; align-items: flex-start; gap: 16px; padding: 24px;
  background: #fff; border: 1px solid rgba(201, 168, 106, 0.3); border-radius: var(--radius);
  margin-bottom: 16px;
}
.patent__icon { width: 36px; height: 36px; color: var(--gold-dark); flex-shrink: 0; margin-top: 2px; }
.patent__text { display: flex; flex-direction: column; gap: 4px; }
.patent__label { font-size: 12px; color: var(--gold-dark); letter-spacing: 2px; }
.patent__no { font-family: var(--serif); font-size: 20px; font-weight: 500; color: var(--forest); letter-spacing: 1px; }
.patent__desc { font-size: 13px; color: var(--text-mid); }
.patent__note { font-size: 14px; color: var(--text-dark); margin: 24px 0 20px; letter-spacing: 1px; }

/* 君臣佐使配伍表 */
.formula { margin-bottom: 36px; }
.formula__row {
  display: flex; align-items: stretch; gap: 20px; padding: 22px 0;
  border-bottom: 1px solid rgba(201, 168, 106, 0.2);
}
.formula__row:last-child { border-bottom: none; }
.formula__role {
  flex-shrink: 0; width: 48px; height: 48px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-weight: 600; font-size: 22px; color: #fff;
}
.formula__role--jun { background: linear-gradient(135deg, #d97886, var(--sakura)); }
.formula__role--chen { background: linear-gradient(135deg, var(--gold), var(--gold-light)); }
.formula__role--zuo { background: linear-gradient(135deg, var(--jade), #4a7c5a); }
.formula__role--shi { background: linear-gradient(135deg, var(--gold-dark), #8a6a38); }
.formula__body { flex: 1; display: flex; flex-direction: column; gap: 4px; padding-top: 4px; }
.formula__herb { font-family: var(--serif); font-weight: 500; font-size: 17px; color: var(--forest); letter-spacing: 1.5px; }
.formula__effect { font-size: 13px; color: var(--text-mid); line-height: 1.7; }

/* 产品特色 */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feature {
  text-align: center; padding: 24px 12px;
  background: #fff; border: 1px solid rgba(201, 168, 106, 0.2); border-radius: var(--radius);
  transition: all 0.35s var(--ease);
}
.feature:hover { border-color: var(--gold); transform: translateY(-3px); }
.feature__icon { width: 32px; height: 32px; margin: 0 auto 12px; color: var(--gold-dark); }
.feature__name { font-size: 13px; color: var(--forest); letter-spacing: 1.5px; font-weight: 500; }

/* ============================================================
   三花蕊 · 心脑血管年轻化
   ============================================================ */
.section__tagline {
  font-size: 14px; color: var(--text-light-dim); letter-spacing: 1.5px;
  margin-top: 14px;
}

.shr-intro { display: grid; grid-template-columns: 1fr 1.3fr; gap: 60px; align-items: center; }
.shr-visual { min-height: 420px; }

/* 水丸瓶视觉（纯CSS） */
.shr-jar { position: relative; width: 190px; height: 300px; z-index: 2; }
.shr-jar__body {
  position: absolute; bottom: 0; left: 0; right: 0; height: 258px;
  background: linear-gradient(180deg, rgba(250, 247, 240, 0.95), rgba(232, 225, 210, 0.9));
  border: 1px solid rgba(201, 168, 106, 0.45);
  border-radius: 24px 24px 14px 14px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 0 18px;
  box-shadow: inset 2px 0 12px rgba(255,255,255,0.4), 0 12px 40px rgba(0,0,0,0.35);
}
.shr-jar__cap {
  position: absolute; top: 8px; left: 50%; transform: translateX(-50%);
  width: 110px; height: 34px;
  background: linear-gradient(180deg, var(--gold-light), var(--gold), var(--gold-dark));
  border-radius: 8px 8px 4px 4px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.shr-jar__cn {
  font-family: var(--serif); font-weight: 600; font-size: 32px;
  color: var(--forest); letter-spacing: 8px; margin-bottom: 10px;
}
.shr-jar__sub { font-size: 12px; color: var(--gold-dark); letter-spacing: 2px; margin-bottom: 10px; }
.shr-jar__spec { font-size: 10px; color: var(--text-mid); letter-spacing: 2px; }

.shr-name {
  font-family: var(--serif); font-weight: 500; font-size: clamp(24px, 3vw, 32px);
  color: var(--cream); letter-spacing: 3px; margin-bottom: 12px;
}
.shr-pos { font-size: 14px; color: var(--text-light-dim); margin-bottom: 24px; letter-spacing: 1px; }
.shr-story {
  border-left: 2px solid var(--gold); padding: 6px 0 6px 20px;
  margin-bottom: 32px; font-size: 14px; color: var(--text-light); line-height: 2;
}
.shr-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.shr-stat {
  text-align: center; padding: 22px 12px;
  background: rgba(250, 247, 240, 0.05); border: 1px solid rgba(201, 168, 106, 0.25);
  border-radius: var(--radius); transition: all 0.4s var(--ease);
}
.shr-stat:hover { border-color: var(--gold); transform: translateY(-3px); }
.shr-stat__num {
  display: block; font-family: var(--serif); font-weight: 300; font-size: 32px;
  color: var(--gold-light); line-height: 1.2; margin-bottom: 6px;
}
.shr-stat__label { font-size: 12px; color: var(--text-light-dim); letter-spacing: 1px; }
.shr-omega {
  margin-top: 20px; text-align: center; padding: 16px 24px;
  border: 1px dashed rgba(201, 168, 106, 0.4); border-radius: var(--radius);
  font-size: 15px; color: var(--text-light); letter-spacing: 1px;
}
.shr-omega em { color: var(--gold-light); font-family: var(--serif); font-size: 20px; font-weight: 600; }

/* 组方 */
.shr-herbs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.shr-herb {
  background: rgba(250, 247, 240, 0.05); border: 1px solid rgba(201, 168, 106, 0.2);
  border-radius: var(--radius); padding: 32px 22px; text-align: center;
  transition: all 0.4s var(--ease);
}
.shr-herb:hover { border-color: var(--gold); transform: translateY(-5px); }
.shr-herb__icon { width: 42px; height: 42px; margin: 0 auto 16px; color: var(--sakura); }
.shr-herb__name {
  display: block; font-family: var(--serif); font-weight: 500; font-size: 19px;
  color: var(--cream); letter-spacing: 2px; margin-bottom: 12px;
}
.shr-herb__quote { font-size: 12.5px; color: var(--text-light-dim); line-height: 1.9; }
.shr-herb__src { display: block; margin-top: 10px; font-size: 11px; color: var(--gold); letter-spacing: 1px; }

/* 科学机制 */
.shr-mechs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.shr-mech {
  display: flex; align-items: flex-start; gap: 16px; padding: 26px 24px;
  background: rgba(250, 247, 240, 0.04); border: 1px solid rgba(201, 168, 106, 0.18);
  border-radius: var(--radius); transition: all 0.4s var(--ease);
}
.shr-mech:hover { border-color: var(--gold); transform: translateY(-4px); }
.shr-mech__icon { width: 34px; height: 34px; flex-shrink: 0; color: var(--gold); margin-top: 2px; }
.shr-mech__name {
  display: block; font-family: var(--serif); font-weight: 500; font-size: 16px;
  color: var(--cream); margin-bottom: 6px; letter-spacing: 1px;
}
.shr-mech__desc { font-size: 13px; color: var(--text-light-dim); line-height: 1.8; }

/* 期刊佐证 */
.shr-papers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 28px; }
.shr-paper {
  padding: 24px 22px; background: rgba(201, 168, 106, 0.06);
  border: 1px solid rgba(201, 168, 106, 0.2); border-radius: var(--radius);
}
.shr-paper__journal {
  display: block; font-family: var(--serif); font-size: 14px; font-style: italic;
  color: var(--gold-light); letter-spacing: 1px; margin-bottom: 10px;
}
.shr-paper p { font-size: 12.5px; color: var(--text-light-dim); line-height: 1.9; }

/* 使用周期 */
.shr-timeline { display: flex; align-items: stretch; justify-content: center; gap: 18px; }
.shr-step {
  flex: 1; max-width: 280px; text-align: center; padding: 36px 20px;
  background: rgba(250, 247, 240, 0.05); border: 1px solid rgba(201, 168, 106, 0.25);
  border-radius: var(--radius); transition: all 0.4s var(--ease);
}
.shr-step:hover { border-color: var(--gold); transform: translateY(-4px); }
.shr-step__day {
  display: block; font-family: var(--serif); font-weight: 300; font-size: 46px;
  color: var(--gold-light); line-height: 1; margin-bottom: 12px;
}
.shr-step__day small { font-size: 18px; margin-left: 2px; }
.shr-step__name { font-size: 14px; color: var(--text-light); letter-spacing: 1px; }
.shr-arrow { align-self: center; font-size: 26px; color: var(--gold); font-family: var(--serif); }

/* 适用人群 */
.shr-audience { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.shr-aud {
  padding: 28px 24px; text-align: center;
  background: rgba(250, 247, 240, 0.04); border: 1px solid rgba(201, 168, 106, 0.18);
  border-radius: var(--radius); transition: all 0.4s var(--ease);
}
.shr-aud:hover { border-color: var(--gold); transform: translateY(-4px); }
.shr-aud__name {
  display: block; font-family: var(--serif); font-weight: 500; font-size: 17px;
  color: var(--cream); letter-spacing: 1.5px; margin-bottom: 10px;
}
.shr-aud__desc { font-size: 13px; color: var(--text-light-dim); line-height: 1.8; }
.shr-aud--spec { background: rgba(201, 168, 106, 0.1); border-color: rgba(201, 168, 106, 0.45); }
.shr-note {
  margin-top: 32px; text-align: center; font-family: var(--serif);
  font-size: 16px; color: var(--gold-light); letter-spacing: 2px;
}

/* 机构合作 */
.shr-coop {
  margin-top: 56px; display: flex; align-items: center; justify-content: space-between;
  gap: 24px; flex-wrap: wrap; padding: 28px 32px;
  background: rgba(201, 168, 106, 0.08); border: 1px solid rgba(201, 168, 106, 0.35);
  border-radius: var(--radius);
}
.shr-coop__title {
  display: block; font-family: var(--serif); font-weight: 500; font-size: 18px;
  color: var(--cream); letter-spacing: 1.5px; margin-bottom: 6px;
}
.shr-coop__desc { font-size: 13px; color: var(--text-light-dim); letter-spacing: 0.5px; }
.shr-coop__tags { display: flex; gap: 10px; flex-wrap: wrap; }
.shr-coop__tags span {
  font-size: 12px; color: var(--gold-light); padding: 6px 14px;
  border: 1px solid rgba(201, 168, 106, 0.35); border-radius: 50px; letter-spacing: 1px;
}

/* ============================================================
   公司愿景
   ============================================================ */
.vision__bg {
  position: absolute; inset: 0; will-change: transform;
  background:
    radial-gradient(circle at 50% 40%, rgba(201, 168, 106, 0.12), transparent 50%),
    radial-gradient(circle at 20% 80%, rgba(26, 60, 46, 0.6), transparent 60%);
}
.vision__content { position: relative; z-index: 2; text-align: center; }
.vision__divider { width: 120px; height: 20px; margin: 0 auto 36px; color: var(--gold); }
.vision__title {
  font-family: var(--serif); font-weight: 500; font-size: clamp(26px, 3.5vw, 36px);
  color: var(--gold); letter-spacing: 6px; margin-bottom: 40px;
}
.vision__text {
  max-width: 820px; margin: 0 auto 48px; font-size: clamp(15px, 1.8vw, 18px);
  color: var(--text-light); line-height: 2.2; font-family: var(--serif); font-weight: 400;
  letter-spacing: 1px;
}
.vision__keywords { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.vision__keywords span {
  font-family: var(--serif); font-size: 15px; color: var(--gold);
  letter-spacing: 4px; padding: 8px 28px; border: 1px solid rgba(201, 168, 106, 0.35); border-radius: 50px;
}

/* ============================================================
   页脚
   ============================================================ */
.footer { background: var(--ink); color: var(--text-light); padding: 64px 0 0; }
.footer__inner {
  display: grid; grid-template-columns: 1fr 1.4fr; gap: 40px; padding-bottom: 40px;
  border-bottom: 1px solid rgba(201, 168, 106, 0.15);
}
.footer__brand { display: flex; flex-direction: column; gap: 8px; }
.footer__cn { font-family: var(--serif); font-weight: 600; font-size: 22px; color: var(--cream); letter-spacing: 4px; }
.footer__en { font-size: 11px; color: var(--gold); letter-spacing: 2px; line-height: 1.6; }
.footer__addr p { font-size: 13px; color: var(--text-light-dim); line-height: 1.9; letter-spacing: 0.5px; }
.footer__bar { text-align: center; padding: 20px 0; font-size: 12px; color: var(--text-light-dim); letter-spacing: 1px; }

/* ============================================================
   滚动渐入（CSS animation，不占用 transition 通道，与 hover 效果零冲突）
   ============================================================ */
.js-reveal { opacity: 0; }
.js-reveal.is-visible {
  animation: revealUp 0.9s var(--ease) both;
  animation-delay: var(--d, 0s);
}
@keyframes revealUp {
  from { opacity: 0; transform: translateY(36px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hero 标题分行节奏（JS 会按序覆盖 --d） */
.js-reveal.d1 { --d: 0.14s; }
.js-reveal.d2 { --d: 0.28s; }
.js-reveal.d3 { --d: 0.42s; }

/* 区块网格卡片节奏错开（纯 CSS，零 JS 成本） */
.research__grid .js-reveal:nth-child(2), .mechanism .js-reveal:nth-child(2),
.effects .js-reveal:nth-child(2),
.features .js-reveal:nth-child(2) { --d: 0.12s; }
.research__grid .js-reveal:nth-child(3), .mechanism .js-reveal:nth-child(3),
.effects .js-reveal:nth-child(3),
.features .js-reveal:nth-child(3) { --d: 0.24s; }
.research__grid .js-reveal:nth-child(4), .effects .js-reveal:nth-child(4),
.features .js-reveal:nth-child(4) { --d: 0.36s; }

/* 无JS时降级显示 */
.no-js .js-reveal { opacity: 1; }

/* 锚点跳转时为固定导航留出空间 */
section[id] { scroll-margin-top: 84px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .research__grid { grid-template-columns: repeat(2, 1fr); }
  .mechanism { grid-template-columns: 1fr; }
  .effects { grid-template-columns: repeat(2, 1fr); }
  .product { grid-template-columns: 1fr; gap: 40px; }
  .product__visual { min-height: 380px; }
  .features { grid-template-columns: repeat(2, 1fr); }
  .shr-intro { grid-template-columns: 1fr; gap: 40px; }
  .shr-visual { min-height: 380px; }
  .shr-herbs { grid-template-columns: repeat(2, 1fr); }
  .shr-mechs { grid-template-columns: repeat(2, 1fr); }
  .shr-papers { grid-template-columns: 1fr; }
  .shr-audience { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .section { padding: 80px 0; }
  .container { padding: 0 20px; }
  .section__head { margin-bottom: 48px; }
  .nav__links {
    position: fixed; top: 0; right: 0; width: 70%; height: 100vh;
    background: rgba(15, 26, 20, 0.97); backdrop-filter: blur(20px);
    flex-direction: column; justify-content: center; align-items: center; gap: 28px;
    transform: translateX(100%); transition: transform 0.4s var(--ease);
    border-left: 1px solid rgba(201, 168, 106, 0.2);
  }
  .nav.is-open .nav__links { transform: translateX(0); }
  .nav__link { font-size: 18px; }
  .nav__indicator { display: none; }
  .nav__link.is-active::after { width: 100%; }
  .nav__burger { display: flex; }
  .company { grid-template-columns: 1fr; gap: 40px; }
  .company__cards { flex-direction: row; }
  .stat-card { flex: 1; padding: 22px 16px; }
  .stat-card__num { font-size: 30px; }
  .research__grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-block { padding: 28px 14px; }
  .stat-block__num { font-size: 32px; }
  .highlights { grid-template-columns: 1fr; }
  .effects { grid-template-columns: 1fr 1fr; }
  .footer__inner { grid-template-columns: 1fr; gap: 28px; }
  .hero__title { letter-spacing: 4px; }
  .vision__keywords span { font-size: 13px; padding: 6px 20px; }
  .shr-timeline { flex-direction: column; align-items: center; }
  .shr-arrow { transform: rotate(90deg); }
  .shr-mechs { grid-template-columns: 1fr; }
  .shr-audience { grid-template-columns: 1fr; }
  .shr-coop { flex-direction: column; text-align: center; }
  .shr-coop__tags { justify-content: center; }
}

@media (max-width: 480px) {
  .company__cards { flex-direction: column; }
  .research__grid { grid-template-columns: 1fr; }
  .effects { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr 1fr; }
  .hero__cta { flex-direction: column; gap: 14px; align-items: center; }
  .btn { width: 100%; max-width: 260px; }
  .shr-herbs { grid-template-columns: 1fr; }
  .shr-stats { gap: 10px; }
  .shr-stat__num { font-size: 24px; }
  .shr-step__day { font-size: 38px; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .js-reveal { opacity: 1 !important; }
}