/* ============================================================
   协庆号 · 健康营养粉 — 品牌官网
   主色调：白 + 淡绿 | 科技健康食品风格
   ============================================================ */

/* --- Reset & Base --- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;color:#2d3748;line-height:1.7;background:#fff;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit;transition:color .25s}
img{max-width:100%;display:block}
ul{list-style:none}

/* --- CSS Variables --- */
:root{
  --green:#7FBF7F;        /* 主淡绿 */
  --green-d:#5da85d;      /* 深绿hover */
  --green-deep:#2F6B3D;   /* 深绿标题 */
  --green-light:#e8f4e8;  /* 极浅绿背景 */
  --green-pale:#f2f9f2;   /* 淡绿卡片背景 */
  --white:#fff;
  --bg:#f8faf8;
  --text:#2d3748;
  --text-gray:#718096;
  --text-light:#a0aec0;
  --border:#e2e8f0;
  --radius:8px;
  --radius-lg:12px;
  --shadow:0 4px 24px rgba(47,107,61,.08);
  --shadow-lg:0 12px 48px rgba(47,107,61,.10);
  --mw:1200px;
  --transition:all .3s cubic-bezier(.4,0,.2,1);
}

/* --- Typography --- */
h1,h2,h3,h4{line-height:1.3;color:var(--text)}
.serif{font-family:"Noto Serif SC","STSong",serif}

/* --- Container --- */
.container{max-width:var(--mw);margin:0 auto;padding:0 24px}
.section{padding:100px 0}
.section-tight{padding:80px 0}
.section-label{font-size:13px;text-transform:uppercase;letter-spacing:2px;color:var(--green);margin-bottom:12px;font-weight:600}
.section-title{font-size:36px;font-weight:700;margin-bottom:16px;line-height:1.3}
.section-sub{font-size:17px;color:var(--text-gray);max-width:600px;margin:0 auto 0 0;line-height:1.7}
.section-header{text-align:center;margin-bottom:60px}
.section-header .section-sub{margin:0 auto}

/* --- Buttons --- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 36px;border-radius:50px;
  font-size:15px;font-weight:600;cursor:pointer;
  transition:var(--transition);border:none;
  white-space:nowrap;letter-spacing:.5px;
}
.btn-primary{background:var(--green);color:var(--white)}
.btn-primary:hover{background:var(--green-d);transform:translateY(-2px);box-shadow:0 8px 24px rgba(127,191,127,.35)}
.btn-outline{background:transparent;border:1.5px solid var(--green);color:var(--green)}
.btn-outline:hover{background:var(--green);color:var(--white);transform:translateY(-2px)}
.btn-white{background:var(--white);color:var(--green-deep)}
.btn-white:hover{background:var(--green-light);transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,.08)}
.btn-lg{padding:18px 44px;font-size:16px}
.btn-sm{padding:10px 24px;font-size:13px}

/* --- Header / Nav --- */
.header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(127,191,127,.10);
  transition:var(--transition);
}
.header.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.06)}
.header-inner{
  max-width:var(--mw);margin:0 auto;padding:0 32px;
  height:72px;display:flex;align-items:center;justify-content:space-between;
}
.logo{display:flex;align-items:center}
.logo-img{height:42px;width:auto;display:block}
.nav{display:flex;align-items:center;gap:32px}
.nav a{
  font-size:14px;color:var(--text-gray);position:relative;
  padding:6px 0;cursor:pointer;font-weight:500;
}
.nav a::after{
  content:'';position:absolute;bottom:0;left:0;width:0;height:2px;
  background:var(--green);transition:width .3s;
}
.nav a:hover,.nav a.active{color:var(--green-deep)}
.nav a:hover::after,.nav a.active::after{width:100%}
.nav-btn{padding:9px 22px;background:var(--green);color:var(--white)!important;border-radius:50px;font-size:13px;font-weight:600}
.nav-btn::after{display:none!important}
.nav-btn:hover{background:var(--green-d)}
.menu-toggle{display:none;cursor:pointer;width:28px;height:20px;flex-direction:column;justify-content:space-between}
.menu-toggle span{display:block;width:100%;height:2px;background:var(--green-deep);border-radius:1px;transition:var(--transition)}

/* --- Hero --- */
.hero{
  min-height:100vh;display:flex;align-items:center;
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,#f2faf2 0%,#e8f0e8 30%,#fff 100%);
  padding-top:72px;
}
.hero-bg-pattern{
  position:absolute;top:0;right:0;width:60%;height:100%;
  background:radial-gradient(ellipse at 70% 30%,rgba(127,191,127,.15),transparent 70%),
             radial-gradient(ellipse at 30% 70%,rgba(47,107,61,.08),transparent 60%);
  pointer-events:none;
}
.hero-grid{
  max-width:var(--mw);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:1fr 1fr;gap:60px;
  align-items:center;width:100%;position:relative;z-index:1;
}
.hero-content{padding-right:20px}
.hero-badge{
  display:inline-block;padding:6px 16px;background:var(--green-light);
  color:var(--green-deep);border-radius:50px;
  font-size:13px;font-weight:600;margin-bottom:24px;
}
.hero-title{font-size:48px;font-weight:800;line-height:1.2;margin-bottom:20px;color:var(--text)}
.hero-title em{color:var(--green);font-style:normal}
.hero-desc{font-size:18px;color:var(--text-gray);margin-bottom:36px;line-height:1.8}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-visual{
  position:relative;display:flex;align-items:center;justify-content:center;
}
.hero-image-placeholder{
  width:100%;max-width:540px;border-radius:24px;
  overflow:hidden;
  box-shadow:var(--shadow-lg);
}
.hero-image-placeholder img{width:100%;height:auto;display:block;border-radius:24px}
.hero-float-card{
  position:absolute;background:var(--white);border-radius:var(--radius-lg);
  padding:16px 20px;box-shadow:var(--shadow);
  display:flex;align-items:center;gap:12px;
}
.hero-float-card.top-right{top:30px;right:-20px}
.hero-float-card.bottom-left{bottom:40px;left:-30px}
.hero-float-icon{
  width:42px;height:42px;border-radius:10px;
  background:var(--green-light);display:flex;align-items:center;justify-content:center;
  font-size:20px;
}
.hero-float-text strong{display:block;font-size:15px;color:var(--text)}
.hero-float-text span{font-size:12px;color:var(--text-light)}

/* --- Stats Row --- */
.stats{border-bottom:1px solid var(--border)}
.stats-grid{
  max-width:var(--mw);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.stat-item{
  text-align:center;padding:36px 16px;
  border-right:1px solid var(--border);
}
.stat-item:last-child{border-right:none}
.stat-num{font-size:36px;font-weight:800;color:var(--green-deep);margin-bottom:8px}
.stat-num span{font-size:20px;font-weight:500}
.stat-label{font-size:14px;color:var(--text-gray)}

/* --- Feature Cards --- */
.features-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:28px;
}
.feature-card{
  background:var(--white);border-radius:var(--radius-lg);
  padding:40px 32px;transition:var(--transition);
  border:1px solid var(--border);position:relative;overflow:hidden;
}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--green)}
.feature-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--green),var(--green-deep));
  opacity:0;transition:opacity .3s;
}
.feature-card:hover::before{opacity:1}
.feature-icon{
  width:56px;height:56px;border-radius:14px;
  background:var(--green-pale);margin-bottom:20px;
  display:flex;align-items:center;justify-content:center;font-size:26px;
}
.feature-card h3{font-size:19px;margin-bottom:10px;color:var(--text)}
.feature-card p{font-size:15px;color:var(--text-gray);line-height:1.8}

/* --- Product Section --- */
.product-showcase{
  background:var(--bg);padding:100px 0;
}
.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.product-visual{position:relative}
.product-img-box{
  width:100%;aspect-ratio:4/3;border-radius:var(--radius-lg);
  background:linear-gradient(135deg,rgba(127,191,127,.15),rgba(47,107,61,.08));
  display:flex;align-items:center;justify-content:center;
  font-size:60px;box-shadow:var(--shadow-lg);overflow:hidden;
}
.product-img-box img{width:100%;height:100%;object-fit:cover}
.product-info h2{font-size:34px;margin-bottom:16px}
.product-info .section-sub{margin-bottom:28px}
.product-specs{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:28px}
.spec-item{
  display:flex;align-items:center;gap:10px;padding:10px 0;
  font-size:14px;color:var(--text-gray);
}
.spec-dot{width:6px;height:6px;border-radius:50%;background:var(--green);flex-shrink:0}

/* --- Product Cards (3 products) --- */
.products-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.product-card{
  background:var(--white);border-radius:var(--radius-lg);
  overflow:hidden;border:1px solid var(--border);
  transition:var(--transition);
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--green)}
.product-card-img{
  width:100%;aspect-ratio:4/3;
  background:linear-gradient(135deg,var(--green-pale),var(--green-light));
  display:flex;align-items:center;justify-content:center;
  font-size:48px;
}
.product-card-img img{width:100%;height:100%;object-fit:cover}
.product-card-body{padding:24px}
.product-card-body h3{font-size:19px;margin-bottom:6px}
.product-card-body .spec{font-size:13px;color:var(--text-light);margin-bottom:12px}
.product-card-body .price{font-size:24px;font-weight:700;color:var(--green-deep);margin-bottom:12px}
.product-card-body .features{font-size:13px;color:var(--text-gray);line-height:2}
.product-card-body .btn{margin-top:16px;width:100%;justify-content:center}

/* --- Tech Section --- */
.tech-section{background:var(--white)}
.tech-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.tech-visual{
  aspect-ratio:4/3;border-radius:var(--radius-lg);
  background:linear-gradient(135deg,rgba(127,191,127,.15),rgba(47,107,61,.08));
  display:flex;align-items:center;justify-content:center;font-size:60px;
}
.tech-steps{display:flex;flex-direction:column;gap:20px;margin-top:32px}
.tech-step{
  display:flex;gap:16px;padding:16px;
  border-left:2px solid var(--border);
  transition:var(--transition);
}
.tech-step:hover{border-left-color:var(--green)}
.tech-step-num{
  width:36px;height:36px;border-radius:50%;
  background:var(--green-pale);display:flex;align-items:center;justify-content:center;
  font-weight:700;color:var(--green-deep);flex-shrink:0;
}
.tech-step h4{font-size:16px;margin-bottom:4px}
.tech-step p{font-size:14px;color:var(--text-gray)}

/* --- Science / Verify --- */
.verify-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:28px;
}
.verify-card{
  background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:32px 28px;
  text-align:center;transition:var(--transition);
}
.verify-card:hover{box-shadow:var(--shadow);border-color:var(--green)}
.verify-icon{
  width:60px;height:60px;border-radius:50%;
  background:var(--green-pale);margin:0 auto 20px;
  display:flex;align-items:center;justify-content:center;font-size:28px;
}
.verify-card h3{font-size:18px;margin-bottom:10px}
.verify-card p{font-size:14px;color:var(--text-gray);line-height:1.8}

/* --- Applicable People --- */
.people-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.people-card{
  text-align:center;padding:32px 20px;
  border-radius:var(--radius-lg);background:var(--white);
  border:1px solid var(--border);transition:var(--transition);
}
.people-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.people-icon{
  width:56px;height:56px;border-radius:50%;
  background:var(--green-pale);margin:0 auto 16px;
  display:flex;align-items:center;justify-content:center;font-size:24px;
}
.people-card h3{font-size:16px;margin-bottom:6px}

/* --- CTA Banner --- */
.cta-banner{
  background:linear-gradient(135deg,var(--green-deep),var(--green));
  padding:80px 0;text-align:center;color:var(--white);
}
.cta-banner h2{font-size:36px;color:var(--white);margin-bottom:16px}
.cta-banner p{font-size:17px;opacity:.9;margin-bottom:32px;max-width:500px;margin-left:auto;margin-right:auto}
.cta-banner .btn-white{background:var(--white);color:var(--green-deep);border:none}
.cta-banner .btn-outline{border-color:var(--white);color:var(--white)}
.cta-banner .btn-outline:hover{background:var(--white);color:var(--green-deep)}

/* --- Partner / Agent Tiers --- */
.tiers-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.tier-card{
  background:var(--white);border-radius:var(--radius-lg);
  padding:36px 28px;border:1px solid var(--border);
  transition:var(--transition);position:relative;
}
.tier-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.tier-card.featured{border-color:var(--green);box-shadow:var(--shadow)}
.tier-badge{
  position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  padding:4px 16px;background:var(--green);color:var(--white);
  border-radius:50px;font-size:12px;font-weight:600;
}
.tier-card h3{font-size:20px;margin-bottom:8px;text-align:center}
.tier-card .tier-desc{font-size:14px;color:var(--text-gray);text-align:center;margin-bottom:20px}
.tier-features{display:flex;flex-direction:column;gap:10px;margin-bottom:24px}
.tier-feature{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-gray)}
.tier-check{color:var(--green);font-weight:700}

/* --- Form --- */
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group.full{grid-column:1/-1}
.form-group label{font-size:14px;font-weight:600;color:var(--text)}
.form-group input,.form-group select,.form-group textarea{
  width:100%;padding:12px 16px;border:1px solid var(--border);
  border-radius:var(--radius);font-size:14px;font-family:inherit;
  transition:var(--transition);background:var(--white);
}
.form-group input:focus,.form-group textarea:focus,.form-group select:focus{
  outline:none;border-color:var(--green);box-shadow:0 0 0 3px rgba(127,191,127,.15);
}
.form-group textarea{resize:vertical;min-height:100px}

/* --- Knowledge / SEO --- */
.knowledge-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.knowledge-card{
  background:var(--white);border-radius:var(--radius-lg);
  padding:32px 28px;border:1px solid var(--border);
  transition:var(--transition);
}
.knowledge-card:hover{border-color:var(--green);box-shadow:var(--shadow)}
.knowledge-card .cat{font-size:12px;color:var(--green);text-transform:uppercase;letter-spacing:1px;margin-bottom:8px}
.knowledge-card h3{font-size:18px;margin-bottom:10px}
.knowledge-card p{font-size:14px;color:var(--text-gray);line-height:1.8}

/* --- Contact --- */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:60px}
.contact-info h2{font-size:32px;margin-bottom:16px}
.contact-info .section-sub{margin-bottom:32px}
.contact-item{
  display:flex;align-items:flex-start;gap:14px;margin-bottom:24px;
}
.contact-icon{
  width:44px;height:44px;border-radius:12px;
  background:var(--green-pale);display:flex;align-items:center;justify-content:center;
  font-size:20px;flex-shrink:0;
}
.contact-item h4{font-size:14px;color:var(--text-light);margin-bottom:2px}
.contact-item p{font-size:16px;color:var(--text);font-weight:500}

/* --- Compliance Note --- */
.compliance-note{
  background:var(--green-pale);border-radius:var(--radius-lg);
  padding:20px 24px;margin-top:28px;
  font-size:13px;color:var(--text-gray);
  display:flex;align-items:flex-start;gap:10px;line-height:1.8;
}
.compliance-note .icon{font-size:20px;flex-shrink:0}

/* --- Footer --- */
.footer{
  background:#1a2e1f;color:rgba(255,255,255,.75);
  padding:64px 0 32px;
}
.footer-grid{
  max-width:var(--mw);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;
}
.footer h3{font-size:16px;color:var(--white);margin-bottom:16px}
.footer p,.footer a{font-size:13px;color:rgba(255,255,255,.55);line-height:2}
.footer a:hover{color:var(--green)}
.footer .company{font-size:13px;line-height:2;color:rgba(255,255,255,.5)}
.footer-bottom{
  max-width:var(--mw);margin:0 auto;padding:24px 24px 0;
  border-top:1px solid rgba(255,255,255,.08);margin-top:40px;
  display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:10px;
}
.footer-bottom span{font-size:12px;color:rgba(255,255,255,.35)}

/* --- Page Hero (inner pages) --- */
.page-hero{
  padding:140px 0 80px;
  background:linear-gradient(160deg,var(--green-pale),var(--bg));
  text-align:center;
}
.page-hero h1{font-size:40px;font-weight:800;margin-bottom:14px}
.page-hero p{font-size:17px;color:var(--text-gray);max-width:500px;margin:0 auto}
.page-hero .breadcrumb{
  font-size:13px;color:var(--text-light);margin-bottom:16px;
}
.page-hero .breadcrumb a{color:var(--green)}
.page-hero .breadcrumb a:hover{color:var(--green-deep)}

/* --- Responsive --- */
@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr;text-align:center}
  .hero-content{padding-right:0}
  .hero-btns{justify-content:center}
  .hero-visual{max-width:350px;margin:0 auto}
  .section-title{font-size:30px}
  .hero-title{font-size:36px}
  .features-grid,.products-grid,.tiers-grid{grid-template-columns:repeat(2,1fr)}
  .people-grid{grid-template-columns:repeat(2,1fr)}
  .product-grid,.tech-grid,.contact-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav{display:none}
  .nav.open{display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;background:var(--white);padding:20px 24px;gap:16px;box-shadow:var(--shadow-lg)}
  .menu-toggle{display:flex}
  .hero-title{font-size:30px}
  .section-title{font-size:26px}
  .hero-desc{font-size:15px}
  .features-grid,.products-grid,.tiers-grid,.verify-grid{grid-template-columns:1fr}
  .people-grid{grid-template-columns:repeat(2,1fr)}
  .knowledge-grid{grid-template-columns:1fr}
  .form-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr}
  .section{padding:60px 0}
  .section-tight{padding:50px 0}
}
@media(max-width:480px){
  .people-grid{grid-template-columns:1fr}
  .hero-btns{flex-direction:column}
}