/* =========================================================
   龙心健康官网 · 设计系统
   医药健康品牌调性：中国红主色 + 金点缀 + 暖白底
   ========================================================= */

:root{
  --red-900:#7f1d1d;
  --red-800:#991b1b;
  --red-700:#b91c1c;
  --red-600:#dc2626;
  --red-500:#ef4444;
  --red-400:#f87171;
  --gold:#c2a24a;
  --gold-deep:#8f6e1c;
  --gold-soft:#efe4c2;

  --ink:#1f1616;
  --ink-soft:#5a5151;
  --ink-faint:#6f6464;

  --bg:#fbf8f6;
  --bg-alt:#f5edea;
  --white:#ffffff;
  --line:#e9deda;
  --line-strong:#d8cbc6;

  --shadow-sm:0 1px 2px rgba(31,22,22,.06),0 2px 8px rgba(31,22,22,.05);
  --shadow-md:0 6px 18px rgba(31,22,22,.08),0 2px 6px rgba(31,22,22,.06);
  --shadow-lg:0 18px 48px rgba(127,29,29,.16),0 8px 20px rgba(127,29,29,.10);

  --r-sm:10px;
  --r-md:16px;
  --r-lg:24px;
  --r-pill:999px;

  --font:"PingFang SC","Microsoft YaHei","Source Han Sans SC","Noto Sans SC","Hiragino Sans GB",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;

  --container:1200px;
  --nav-h:72px;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

/* ---------- layout ---------- */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section--tight{padding:72px 0}
.section--alt{background:var(--bg-alt)}
.section--red{background:linear-gradient(160deg,var(--red-800),var(--red-900));color:#fdefef}

/* ---------- typography ---------- */
.eyebrow{
  display:inline-block;
  font-size:13px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--gold-deep);font-weight:700;margin-bottom:14px;
  position:relative;padding-left:34px;
}
.eyebrow::before{
  content:"";position:absolute;left:0;top:50%;width:24px;height:1.5px;
  background:var(--gold);transform:translateY(-50%);
}
.section--red .eyebrow{color:var(--gold-soft)}

.h-title{font-size:clamp(26px,3.4vw,40px);line-height:1.25;font-weight:800;letter-spacing:-.01em;color:var(--ink)}
.section--red .h-title{color:#fff}
.lead{font-size:17px;color:var(--ink-soft);max-width:680px;margin-top:16px}
.section--red .lead{color:#f3d4d4}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:14px 28px;border-radius:var(--r-pill);
  font-size:15px;font-weight:700;letter-spacing:.01em;
  transition:transform .25s ease,box-shadow .25s ease,background .25s ease,color .25s ease;
  will-change:transform;
}
.btn svg{width:16px;height:16px}
.btn--primary{background:var(--gold);color:#1c1402;box-shadow:0 8px 20px rgba(194,162,74,.32)}
.btn--primary:hover{transform:translateY(-3px);box-shadow:0 14px 28px rgba(194,162,74,.42)}
.btn--ghost{border:1.5px solid rgba(255,255,255,.5);color:#fff}
.btn--ghost:hover{background:rgba(255,255,255,.1);transform:translateY(-3px)}
.btn--dark{background:var(--red-700);color:#fff;box-shadow:0 8px 20px rgba(185,28,28,.28)}
.btn--dark:hover{transform:translateY(-3px);background:var(--red-600);box-shadow:0 14px 28px rgba(185,28,28,.36)}
.btn--line{background:transparent;border:1.5px solid var(--red-700);color:var(--red-700)}
.btn--line:hover{background:var(--red-700);color:#fff;transform:translateY(-3px)}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  height:var(--nav-h);
  background:rgba(251,248,246,.82);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .3s ease,background .3s ease,box-shadow .3s ease;
}
.nav.scrolled{border-color:var(--line);box-shadow:var(--shadow-sm);background:rgba(251,248,246,.94)}
.nav__inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center}
.brand__logo{height:40px;width:auto;flex:none}
.footer__brand .brand__logo{display:inline-block;background:#fff;padding:8px 14px;border-radius:10px;height:44px;box-shadow:0 4px 14px rgba(0,0,0,.18)}
.nav__links{display:flex;align-items:center;gap:4px}
.nav__links a{
  position:relative;padding:10px 16px;font-size:15px;font-weight:600;color:var(--ink-soft);
  border-radius:var(--r-pill);transition:color .2s ease,background .2s ease;
}
.nav__links a:hover{color:var(--red-700);background:rgba(185,28,28,.06)}
.nav__links a.active{color:var(--red-700)}
.nav__links a.active::after{
  content:"";position:absolute;left:16px;right:16px;bottom:4px;height:2px;
  background:var(--gold);border-radius:2px;
}
.nav__cta{display:flex;align-items:center;gap:12px}
.nav__toggle{display:none;width:44px;height:44px;border-radius:12px;align-items:center;justify-content:center}
.nav__toggle span{display:block;width:22px;height:2px;background:var(--ink);position:relative}
.nav__toggle span::before,.nav__toggle span::after{content:"";position:absolute;left:0;width:22px;height:2px;background:var(--ink);transition:.25s}
.nav__toggle span::before{top:-7px}
.nav__toggle span::after{top:7px}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;background:linear-gradient(155deg,#7f1d1d 0%,#991b1b 55%,#7f1d1d 100%);color:#fdefef;padding:120px 0 96px}
.hero__bg{position:absolute;inset:0;opacity:.5;pointer-events:none}
.hero__bg::before{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(circle at 18% 30%,rgba(239,68,68,.35),transparent 42%),
                    radial-gradient(circle at 85% 20%,rgba(194,162,74,.22),transparent 40%);
}
.hero__bg::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:46px 46px;
  mask-image:radial-gradient(circle at 70% 40%,#000,transparent 75%);
  -webkit-mask-image:radial-gradient(circle at 70% 40%,#000,transparent 75%);
}
.hero__inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.hero__tag{display:inline-flex;align-items:center;gap:10px;padding:8px 18px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);font-size:13px;font-weight:600;letter-spacing:.04em;color:#f8d4d4;margin-bottom:26px}
.hero__tag .dot{width:8px;height:8px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 4px rgba(194,162,74,.25)}
.hero h1{font-size:clamp(34px,5vw,56px);line-height:1.12;font-weight:800;letter-spacing:-.02em;color:#fff}
.hero h1 .accent{color:var(--gold-soft)}
.hero__sub{margin-top:22px;font-size:18px;color:#f3caca;max-width:560px;line-height:1.75}
.hero__actions{margin-top:38px;display:flex;gap:16px;flex-wrap:wrap}
.hero__panel{
  position:relative;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);
  border-radius:var(--r-lg);padding:30px;backdrop-filter:blur(6px);box-shadow:var(--shadow-lg);
}
.hero__panel h3{font-size:15px;color:var(--gold-soft);letter-spacing:.08em;text-transform:uppercase;margin-bottom:18px;font-weight:700}
.hero__panel .row{display:flex;align-items:center;gap:14px;padding:14px 0;border-top:1px solid rgba(255,255,255,.1)}
.hero__panel .row:first-of-type{border-top:none}
.hero__panel .ic{width:42px;height:42px;border-radius:12px;background:rgba(239,68,68,.22);display:flex;align-items:center;justify-content:center;flex:none;color:var(--gold-soft)}
.hero__panel .ic svg{width:22px;height:22px}
.hero__panel .row b{display:block;font-size:15px;color:#fff;font-weight:700}
.hero__panel .row span{font-size:13px;color:#eabfbf}

/* ---------- stats band ---------- */
.stats{position:relative;z-index:2;margin-top:-44px}
.stats__grid{
  background:var(--white);border-radius:var(--r-lg);box-shadow:var(--shadow-lg);
  display:grid;grid-template-columns:repeat(4,1fr);overflow:hidden;border:1px solid var(--line);
}
.stat{padding:34px 28px;text-align:center;position:relative}
.stat:not(:last-child)::after{content:"";position:absolute;right:0;top:22%;bottom:22%;width:1px;background:var(--line)}
.stat__num{font-size:clamp(30px,3.6vw,42px);font-weight:800;color:var(--red-700);line-height:1;letter-spacing:-.02em}
.stat__num .u{color:var(--gold-deep);font-size:.62em;margin-left:2px}
.stat__label{margin-top:10px;font-size:14px;color:var(--ink-soft);font-weight:600}

/* ---------- cards ---------- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-md);
  padding:30px;transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease;
  position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.card__ic{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(150deg,var(--red-600),var(--red-700));color:#fff;margin-bottom:20px}
.card__ic svg{width:26px;height:26px}
.card__ic--gold{background:linear-gradient(150deg,var(--gold),var(--gold-deep))}
.card h3{font-size:19px;font-weight:800;color:var(--ink);margin-bottom:10px;letter-spacing:-.01em}
.card p{font-size:14.5px;color:var(--ink-soft);line-height:1.7}
.card .more{display:inline-flex;align-items:center;gap:6px;margin-top:18px;font-size:14px;font-weight:700;color:var(--red-700)}
.card .more svg{width:15px;height:15px;transition:transform .25s ease}
.card:hover .more svg{transform:translateX(4px)}

/* feature card (cooperation) */
.feat{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.feat__card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;
  display:flex;flex-direction:column;transition:transform .3s ease,box-shadow .3s ease;
}
.feat__card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.feat__head{padding:32px 32px 26px;background:linear-gradient(150deg,var(--red-700),var(--red-800));color:#fff;position:relative}
.feat__head .kicker{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-soft);font-weight:700}
.feat__head h3{font-size:24px;font-weight:800;margin-top:8px}
.feat__head .desc{margin-top:12px;font-size:14.5px;color:#f3d4d4}
.feat__body{padding:28px 32px 32px;flex:1;display:flex;flex-direction:column}
.feat__body ul{display:flex;flex-direction:column;gap:14px;margin-bottom:auto}
.feat__body li{display:flex;gap:12px;font-size:14.5px;color:var(--ink-soft);line-height:1.6}
.feat__body li svg{width:18px;height:18px;flex:none;color:var(--red-600);margin-top:3px}
.feat__body .prod{margin-top:24px;padding-top:20px;border-top:1px solid var(--line);font-size:13.5px;color:var(--ink-faint)}
.feat__body .prod b{color:var(--ink)}

/* element grid (龙心6要素) */
.elem{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden}
.elem__cell{background:var(--white);padding:26px 24px;transition:background .25s ease}
.elem__cell:hover{background:var(--bg-alt)}
.elem__cell .n{font-size:13px;font-weight:800;color:var(--gold-deep);letter-spacing:.1em}
.elem__cell h4{font-size:17px;font-weight:800;color:var(--ink);margin:8px 0 6px}
.elem__cell p{font-size:13.5px;color:var(--ink-soft)}

/* product card */
.prod-card{background:var(--white);border:1px solid var(--line);border-radius:var(--r-md);padding:26px;display:flex;flex-direction:column;gap:12px;transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease}
.prod-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.prod-card .top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.prod-card .cat{font-size:12px;font-weight:700;color:var(--red-700);background:rgba(185,28,28,.08);padding:5px 12px;border-radius:var(--r-pill)}
.prod-card .exclusive{font-size:12px;font-weight:700;color:var(--gold-deep);background:var(--gold-soft);padding:5px 12px;border-radius:var(--r-pill)}
.prod-card h4{font-size:18px;font-weight:800;color:var(--ink)}
.prod-card .fn{font-size:14px;color:var(--ink-soft);line-height:1.65}
.prod-card .note{font-size:12.5px;color:var(--ink-faint);margin-top:auto;padding-top:12px;border-top:1px dashed var(--line)}
.prod-card__img{height:170px;display:flex;align-items:center;justify-content:center;background:#f8f8f8;margin:-26px -26px 4px;padding:18px;border-bottom:1px solid var(--line);border-radius:var(--r-md) var(--r-md) 0 0}
.prod-card__img img{max-height:100%;max-width:100%;object-fit:contain}

/* business list */
.biz{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.biz__card{background:var(--white);border:1px solid var(--line);border-radius:var(--r-md);padding:28px;position:relative;overflow:hidden;transition:transform .3s ease,box-shadow .3s ease}
.biz__card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(var(--red-600),var(--red-800))}
.biz__card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.biz__card h4{font-size:20px;font-weight:800;color:var(--ink);margin-bottom:6px}
.biz__card .sys{font-size:13px;font-weight:700;color:var(--gold-deep);margin-bottom:14px}
.biz__card .prods{display:flex;flex-wrap:wrap;gap:8px}
.biz__card .prods span{font-size:13px;color:var(--ink-soft);background:var(--bg-alt);border:1px solid var(--line);padding:5px 12px;border-radius:var(--r-pill)}

/* why section (red) */
.why{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.why__item{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:var(--r-md);padding:28px;transition:background .3s ease,transform .3s ease}
.why__item:hover{background:rgba(255,255,255,.1);transform:translateY(-5px)}
.why__item .ic{width:48px;height:48px;border-radius:12px;background:rgba(194,162,74,.2);color:var(--gold-soft);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.why__item .ic svg{width:24px;height:24px}
.why__item h4{font-size:18px;font-weight:800;color:#fff;margin-bottom:8px}
.why__item p{font-size:14px;color:#f3caca}

/* CTA band */
.cta{background:linear-gradient(135deg,var(--red-700),var(--red-900));border-radius:var(--r-lg);padding:64px 56px;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}
.cta::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;background:radial-gradient(circle,rgba(194,162,74,.3),transparent 70%)}
.cta__text{position:relative;max-width:620px}
.cta__text h2{font-size:clamp(24px,3vw,34px);font-weight:800;line-height:1.25}
.cta__text p{margin-top:14px;color:#f3d4d4;font-size:16px}
.cta__actions{position:relative;display:flex;gap:14px;flex-wrap:wrap}

/* news */
.news{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news__card{background:var(--white);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;display:flex;flex-direction:column;transition:transform .3s ease,box-shadow .3s ease}
.news__card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}
.news__thumb{height:170px;background:linear-gradient(150deg,var(--red-600),var(--red-800));position:relative;display:flex;align-items:center;justify-content:center;color:rgba(255,255,255,.85)}
.news__thumb.video{background:linear-gradient(150deg,var(--gold),var(--gold-deep))}
.news__thumb svg{width:42px;height:42px;opacity:.9}
.news__thumb .tag{position:absolute;left:16px;top:16px;font-size:12px;font-weight:700;color:#fff;background:rgba(0,0,0,.28);padding:5px 12px;border-radius:var(--r-pill)}
.news__body{padding:24px;display:flex;flex-direction:column;gap:10px;flex:1}
.news__body .date{font-size:13px;color:var(--ink-faint)}
.news__body h4{font-size:17px;font-weight:800;color:var(--ink);line-height:1.4}
.news__body p{font-size:14px;color:var(--ink-soft);line-height:1.65}

/* ---------- page hero (inner pages) ---------- */
.page-hero{background:linear-gradient(155deg,#7f1d1d,#991b1b);color:#fdefef;padding:104px 0 76px;position:relative;overflow:hidden}
.page-hero::after{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 80% 10%,rgba(194,162,74,.2),transparent 45%),radial-gradient(circle at 10% 90%,rgba(239,68,68,.28),transparent 45%)}
.page-hero .container{position:relative}
.page-hero .crumb{font-size:13px;color:#f3caca;margin-bottom:16px}
.page-hero .crumb a:hover{color:#fff}
.page-hero h1{font-size:clamp(30px,4.4vw,46px);font-weight:800;color:#fff;line-height:1.15;letter-spacing:-.02em}
.page-hero p{margin-top:16px;font-size:17px;color:#f3caca;max-width:640px}

/* ---------- footer ---------- */
.footer{background:var(--red-900);color:#f3d4d4;padding:72px 0 0}
.footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px}
.footer__brand p{margin-top:18px;font-size:14px;color:#d6a9a9;max-width:300px;line-height:1.7}
.footer h5{font-size:15px;font-weight:800;color:#fff;margin-bottom:18px;letter-spacing:.02em}
.footer__links li{margin-bottom:12px}
.footer__links a{font-size:14px;color:#e6b4b4;transition:color .2s ease}
.footer__links a:hover{color:var(--gold-soft)}
.footer__contact li{display:flex;gap:12px;font-size:14px;color:#e6b4b4;margin-bottom:14px;line-height:1.6}
.footer__contact svg{width:18px;height:18px;flex:none;color:var(--gold-soft);margin-top:2px}
.footer__bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:56px;padding:24px 0;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;font-size:13px;color:#c78e8e}
.footer__bottom a{color:#e6b4b4}
.footer__bottom a:hover{color:#fff}

/* ---------- form ---------- */
.form{background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);padding:38px;box-shadow:var(--shadow-sm)}
.form__grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field{display:flex;flex-direction:column;gap:8px}
.field.full{grid-column:1/-1}
.field label{font-size:14px;font-weight:700;color:var(--ink)}
.field input,.field select,.field textarea{
  font-family:inherit;font-size:15px;color:var(--ink);background:var(--bg);
  border:1.5px solid var(--line);border-radius:var(--r-sm);padding:13px 15px;
  transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--red-600);background:#fff;box-shadow:0 0 0 4px rgba(220,38,38,.12);
}
.field textarea{resize:vertical;min-height:120px}
.form__note{font-size:13px;color:var(--ink-faint);margin-top:14px}

/* ---------- reveal animation (only hidden when JS enabled, prevents blank page if JS fails) ---------- */
html.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
html.js .reveal.in{opacity:1;transform:none}
html.js .reveal.d1{transition-delay:.08s}
html.js .reveal.d2{transition-delay:.16s}
html.js .reveal.d3{transition-delay:.24s}
html.js .reveal.d4{transition-delay:.32s}
@media (prefers-reduced-motion:reduce){html.js .reveal{opacity:1;transform:none;transition:none}}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .hero__inner{grid-template-columns:1fr;gap:40px}
  .hero__panel{max-width:520px}
  .stats__grid{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(2)::after{display:none}
  .stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--line)}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .why{grid-template-columns:repeat(2,1fr)}
  .footer__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .section{padding:64px 0}
  .nav__links{display:none}
  .nav__toggle{display:flex}
  .nav.open .nav__links{
    display:flex;flex-direction:column;position:absolute;top:var(--nav-h);left:0;right:0;
    background:var(--white);border-bottom:1px solid var(--line);box-shadow:var(--shadow-md);
    padding:14px;gap:2px;align-items:stretch;
  }
  .nav.open .nav__links a{padding:14px 16px;border-radius:12px}
  .nav.open .nav__links a.active::after{display:none}
  .grid-2,.grid-3,.grid-4,.feat,.elem,.biz,.news,.why{grid-template-columns:1fr}
  .form__grid{grid-template-columns:1fr}
  .stats__grid{grid-template-columns:1fr 1fr}
  .cta{padding:44px 28px}
  .footer__grid{grid-template-columns:1fr}
  .hero{padding:88px 0 76px}
}
@media (max-width:480px){
  .container{padding:0 18px}
  .stats__grid{grid-template-columns:1fr}
  .stat::after{display:none!important}
  .stat{border-bottom:1px solid var(--line)}
  .stat:last-child{border-bottom:none}
}