/* ============================================================
   赫北营 HEY BURN — 官网首页
   ============================================================ */
:root{
  --ink:#0c0c0e;          /* near-black bg */
  --ink-2:#141417;        /* dark panel */
  --ink-3:#1c1c20;
  --light:#f1efe9;        /* warm off-white */
  --light-2:#e8e5dd;
  --accent:#c0301f;       /* hey-burn 砖红 (源稿取色) */
  --accent-d:#9f2618;
  --cyan:#3ec7d6;         /* 户外厨房系统板块辅助青色 (源稿取色) */
  --txt-light:#e9e7e2;
  --txt-mut:#8c8c92;      /* muted on dark */
  --txt-dark:#1a1a1c;
  --txt-dark-mut:#6b6b6e;
  --line-dark:rgba(255,255,255,.10);
  --line-light:rgba(0,0,0,.10);
  --maxw:1600px;
  --ff-disp:'Oswald',sans-serif;
  --ff-cn:'Noto Sans SC',sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--ff-cn);
  background:var(--ink);
  color:var(--txt-light);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  line-height:1.7;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.container{width:min(var(--maxw),92vw);margin-inline:auto}

/* ---------- shared type ---------- */
.eyebrow{
  font-family:var(--ff-disp);
  font-weight:500;
  letter-spacing:.32em;
  font-size:.72rem;
  text-transform:uppercase;
  color:var(--txt-dark-mut);
  margin-bottom:1.1rem;
  display:inline-flex;align-items:center;gap:.7em;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.7}
.eyebrow--accent{color:var(--accent)}
.partner__content .eyebrow::before,.principles .eyebrow::before{display:none}
.h2{
  font-family:var(--ff-cn);
  font-weight:900;
  font-size:clamp(1.9rem,3.6vw,2.9rem);
  letter-spacing:.04em;
  color:var(--txt-dark);
  line-height:1.15;
}
.h2--light{color:#fff}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--ff-cn);font-weight:700;
  font-size:.95rem;letter-spacing:.05em;
  padding:.85em 1.7em;
  border:1px solid transparent;
  cursor:pointer;
  transition:.32s cubic-bezier(.2,.7,.3,1);
}
.btn .arr{transition:transform .32s cubic-bezier(.2,.7,.3,1)}
.btn:hover .arr{transform:translateX(5px)}
.btn--accent{background:var(--accent);color:#fff;border-radius:2px}
.btn--accent:hover{background:var(--accent-d);box-shadow:0 10px 30px -10px var(--accent)}
.btn--lg{padding:1.05em 2.2em;font-size:1rem}
.btn--dark{background:var(--txt-dark);color:#fff;border-radius:2px}
.btn--dark:hover{background:#000}

/* ============================================================
   NAV
   ============================================================ */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:100;
  transition:background .4s ease,backdrop-filter .4s ease,border-color .4s;
  border-bottom:1px solid transparent;
}
.nav.is-stuck{
  background:rgba(12,12,14,.82);
  backdrop-filter:blur(14px);
  border-bottom-color:var(--line-dark);
}
.nav__inner{
  width:min(var(--maxw),92vw);margin-inline:auto;
  height:78px;display:flex;align-items:center;gap:2rem;
}
.nav__logo img{height:40px;width:auto;display:block}
.nav__links{
  display:flex;gap:2.1rem;margin-left:auto;
  font-size:.96rem;font-weight:500;color:var(--txt-light);
}
.nav__links a{position:relative;padding:.3em 0;transition:color .25s}
.nav__links a::after{
  content:"";position:absolute;left:0;bottom:-2px;
  width:0;height:2px;background:var(--accent);transition:width .3s;
}
.nav__links a:hover{color:#fff}
.nav__links a:hover::after{width:100%}
.nav__cta{margin-left:.5rem}
/* 产品目录下拉菜单 */
.nav__drop{position:relative;display:inline-flex;align-items:center}
.nav__caret{font-style:normal;font-size:.62em;margin-left:.4em;opacity:.7;transition:transform .25s;display:inline-block}
.nav__drop:hover .nav__caret{transform:rotate(180deg)}
.nav__sub{
  position:absolute;top:100%;left:50%;transform:translateX(-50%) translateY(10px);
  min-width:172px;padding:.5rem 0;
  background:rgba(12,12,14,.97);backdrop-filter:blur(14px);
  border:1px solid var(--line-dark);border-radius:4px;
  box-shadow:0 24px 48px -18px rgba(0,0,0,.7);
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transition:opacity .25s,transform .25s,visibility .25s;z-index:60;
}
.nav__sub::before{content:"";position:absolute;top:-12px;left:0;right:0;height:12px}
.nav__drop:hover .nav__sub{opacity:1;visibility:visible;transform:translateX(-50%) translateY(2px)}
.nav__sub a{padding:.62rem 1.5rem;font-size:.9rem;font-weight:400;color:var(--txt-mut);white-space:nowrap;transition:color .2s,padding .2s,background .2s}
.nav__sub a::after{display:none}
.nav__sub a:hover{color:#fff;background:rgba(192,48,31,.16);padding-left:1.8rem}
.nav__burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__burger span{width:24px;height:2px;background:#fff;transition:.3s}

/* ============================================================
   HERO
   ============================================================ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden}
.hero__bg{
  position:absolute;inset:0;
  background:url("assets/hero.png") center/cover no-repeat;
  transform:scale(1.08);
  animation:heroZoom 14s ease-out forwards;
}
@keyframes heroZoom{to{transform:scale(1)}}
.hero__scrim{display:none} /* 客户要求：首页头图不加黑色遮罩，保持图片清晰 */
.hero__content{position:relative;z-index:2;width:min(var(--maxw),92vw);margin-inline:auto;padding-top:78px}
.hero__eyebrow{
  font-family:var(--ff-disp);font-weight:600;
  letter-spacing:.42em;font-size:.85rem;color:var(--accent);
  text-transform:uppercase;margin-bottom:1.4rem;
}
.hero__title{
  font-family:var(--ff-cn);font-weight:900;
  font-size:clamp(2.8rem,7vw,5.6rem);
  line-height:1.05;letter-spacing:.03em;color:#fff;
  text-shadow:0 2px 10px rgba(0,0,0,.55),0 4px 40px rgba(0,0,0,.6);
}
.hero__title span{display:block}
.hero__title em{color:var(--accent);font-style:normal}
.hero__sub{
  margin:1.8rem 0 2.4rem;font-size:1.18rem;font-weight:400;
  color:rgba(255,255,255,.92);line-height:1.8;letter-spacing:.04em;
  text-shadow:0 2px 8px rgba(0,0,0,.6);
}
.hero__scroll{position:absolute;left:50%;bottom:34px;transform:translateX(-50%);z-index:2}
.hero__scroll span{
  display:block;width:22px;height:36px;border:2px solid rgba(255,255,255,.45);border-radius:12px;position:relative;
}
.hero__scroll span::before{
  content:"";position:absolute;left:50%;top:7px;width:3px;height:7px;border-radius:2px;
  background:#fff;transform:translateX(-50%);animation:scrollDot 1.8s ease infinite;
}
@keyframes scrollDot{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}80%{opacity:0;transform:translate(-50%,12px)}}

/* ============================================================
   sections base
   ============================================================ */
.section--light{background:var(--light);color:var(--txt-dark);position:relative}
.section--dark{background:var(--ink);position:relative}
section{padding-block:clamp(4.5rem,9vw,8rem)}

/* ============================================================
   ABOUT
   ============================================================ */
.about{overflow:hidden}
.about__mountain{
  position:absolute;right:-4%;top:8%;width:50%;height:70%;
  background:radial-gradient(120% 80% at 80% 30%,rgba(0,0,0,.05),transparent 60%);
  pointer-events:none;
}
.about__mountain::after{
  content:"";position:absolute;right:0;top:30%;width:100%;height:46%;
  background:
    linear-gradient(135deg,transparent 48%,rgba(0,0,0,.05) 49%,transparent 51%),
    linear-gradient(-135deg,transparent 60%,rgba(0,0,0,.04) 61%,transparent 63%);
  clip-path:polygon(0 100%,18% 40%,32% 70%,52% 12%,70% 55%,84% 28%,100% 75%,100% 100%);
  opacity:.5;
}
.about__grid{
  display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(2.5rem,6vw,6rem);align-items:center;
  position:relative;z-index:1;
}
.about__media{position:relative}
.about__media img{width:100%;height:auto;position:relative;z-index:2;box-shadow:0 30px 60px -25px rgba(0,0,0,.4)}
.about__text .eyebrow{color:var(--txt-dark-mut)}
.about__text .h2::after{content:"";display:block;width:62px;height:3px;background:var(--accent);margin-top:1.1rem}
.about__body{margin-top:1.6rem}
.about__body p{color:var(--txt-dark-mut);font-size:1.02rem;margin-bottom:1.1rem;max-width:46ch}

/* ============================================================
   BRAND CONCEPT
   ============================================================ */
.concept{background:linear-gradient(180deg,#0a0a0c,#141417);overflow:hidden}
/* 山峦剪影 */
.concept::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:62%;z-index:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(255,255,255,.018),rgba(255,255,255,.04));
  clip-path:polygon(0 100%,8% 64%,16% 80%,26% 50%,36% 72%,46% 40%,54% 66%,64% 36%,74% 64%,84% 48%,92% 70%,100% 56%,100% 100%);
}
.concept__noise{
  position:absolute;inset:0;opacity:.6;pointer-events:none;z-index:0;
  background:
    radial-gradient(90% 70% at 50% 110%,rgba(192,48,31,.12),transparent 60%),
    radial-gradient(55% 50% at 84% 90%,rgba(192,48,31,.08),transparent 60%);
}
/* 火星粒子 */
.concept__noise::before{
  content:"";position:absolute;left:8%;top:78%;width:3px;height:3px;border-radius:50%;
  background:#ef6a3d;opacity:.85;
  box-shadow:
    120px -50px 0 0 #e85d33, 250px -140px 0 1px #f07a4a, 380px -70px 0 0 #e85d33,
    520px -190px 0 1px #f08a5a, 670px -100px 0 0 #e85d33, 820px -210px 0 1px #ef6a3d,
    980px -60px 0 0 #e85d33, 1130px -160px 0 1px #f07a4a, 70px -230px 0 0 #ef6a3d,
    310px -270px 0 1px #e85d33, 600px -320px 0 0 #f08a5a, 900px -250px 0 1px #ef6a3d,
    1180px -300px 0 0 #e85d33, 440px -360px 0 1px #ef6a3d;
  animation:ember 6.5s ease-in-out infinite alternate;
}
@keyframes ember{from{transform:translateY(0);opacity:.45}to{transform:translateY(-20px);opacity:.9}}
.concept__grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:minmax(150px,auto) repeat(3,1fr);
  gap:clamp(1rem,2vw,2.2rem);align-items:baseline;
}
.concept__head{position:relative;top:-3.6rem}
.concept__head .eyebrow{position:absolute;left:0;bottom:calc(100% + .5rem);margin:0;white-space:nowrap;color:#fff}
.concept__head .eyebrow::before{display:none}
.concept__head .h2{line-height:1.1;white-space:nowrap;font-weight:700}
.concept__head .h2::after{content:"";display:block;width:58px;height:3px;background:var(--accent);margin-top:1rem}
.concept__col{
  display:flex;align-items:baseline;gap:clamp(.5rem,1.2vw,1.3rem);
  border-left:1px solid var(--line-dark);
  padding-left:clamp(1rem,1.8vw,1.8rem);min-width:0;
}
.concept__char{
  font-family:var(--ff-cn);font-weight:900;
  font-size:clamp(3.8rem,6.2vw,7rem);line-height:.9;
  color:var(--accent);flex:none;
  text-shadow:0 0 60px rgba(192,48,31,.35);
}
.concept__txt{min-width:0}
.concept__title{font-size:clamp(1.15rem,1.5vw,1.5rem);font-weight:700;color:#fff;letter-spacing:.08em;margin-bottom:.85rem;white-space:nowrap}
.concept__desc{color:var(--txt-mut);font-size:.92rem;line-height:1.8;letter-spacing:.02em;white-space:nowrap}

/* ============================================================
   COOKING SYSTEM
   ============================================================ */
.system{background:var(--light);position:relative;overflow:hidden}
.system__grid{
  display:grid;grid-template-columns:1fr 1.1fr;gap:clamp(2.5rem,5vw,5rem);align-items:center;
}
.system__text .eyebrow::before{display:none}
.system__text .h2{font-weight:700}
.system__text .h2::after{content:"";display:block;width:58px;height:3px;background:var(--cyan);margin-top:1rem}
.system__lead{margin:1.6rem 0 2.2rem;font-size:1.12rem;color:var(--txt-dark);font-weight:500;line-height:1.8}
.system__tags{list-style:none;display:flex;flex-wrap:wrap;gap:1.4rem 2.2rem;margin-bottom:2.4rem}
.system__tags li{display:flex;align-items:center;gap:.7em}
.system__tags .hexico{flex:none;width:38px;height:38px;display:grid;place-items:center;color:var(--txt-dark-mut)}
.system__tags .hexico svg{width:34px;height:34px;fill:none;stroke:currentColor;stroke-width:1.3;stroke-linecap:round;stroke-linejoin:round}
.system__tags .hexico svg path:last-child{stroke:currentColor;stroke-width:1.6}
.system__tags .hextxt{display:flex;flex-direction:column;line-height:1.25}
.system__tags strong{font-size:1.02rem;font-weight:700;color:var(--txt-dark)}
.system__tags i{font-family:var(--ff-disp);font-style:normal;letter-spacing:.16em;font-size:.68rem;color:var(--txt-dark-mut);text-transform:uppercase}
.system__more{display:inline-flex;align-items:center;gap:.7em;color:var(--txt-dark);font-weight:700;font-size:1rem;letter-spacing:.05em}
.system__more .arr{color:var(--cyan);font-size:1.15em;transition:transform .3s cubic-bezier(.2,.7,.3,1)}
.system__more:hover{color:#000}
.system__more:hover .arr{transform:translateX(6px)}
.system__media{position:absolute;top:0;right:0;bottom:0;width:54%}
.system__media img{
  width:100%;height:100%;object-fit:cover;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 14%);
  mask-image:linear-gradient(90deg,transparent,#000 14%);
}

/* ============================================================
   PARTNER
   ============================================================ */
.partner{position:relative;overflow:hidden;padding-block:clamp(5rem,10vw,9rem)}
.partner__bg{
  position:absolute;inset:0;background:url("assets/partner-bg.png") center/cover no-repeat;
  transform:scale(1.05);
}
.partner__scrim{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,8,10,.92) 0%,rgba(8,8,10,.72) 36%,rgba(8,8,10,.3) 68%,rgba(8,8,10,.45) 100%)}
.partner__content{position:relative;z-index:2;max-width:560px}
/* 居中变体（源稿要求：这段改到正中间来） */
.partner--center .partner__scrim{background:rgba(8,8,10,.62)}
.partner--center .partner__content{max-width:640px;margin-inline:auto;text-align:center}
.partner__title{
  font-family:var(--ff-cn);font-weight:900;color:#fff;
  font-size:clamp(2rem,4.4vw,3.2rem);letter-spacing:.05em;line-height:1.22;margin-bottom:1.3rem;
}
.partner__sub{color:rgba(255,255,255,.82);font-size:1.12rem;line-height:1.9;margin-bottom:2.4rem}

/* ============================================================
   PRINCIPLES
   ============================================================ */
.principles{background:var(--light);position:relative;overflow:hidden}
.principles__bg{
  position:absolute;left:0;right:0;bottom:0;height:55%;z-index:0;pointer-events:none;
  background:linear-gradient(180deg,transparent,rgba(0,0,0,.05));
  clip-path:polygon(0 100%,8% 64%,16% 80%,26% 50%,36% 72%,46% 40%,54% 66%,64% 36%,74% 64%,84% 48%,92% 70%,100% 56%,100% 100%);
}
.principles__grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:minmax(150px,auto) repeat(4,1fr);
  gap:clamp(1rem,2vw,2.2rem);align-items:start;
}
.principles__head{align-self:start;position:relative;top:-2rem}
.principles__head .eyebrow{color:var(--txt-dark-mut)}
.principles__head .h2{font-weight:700;color:var(--txt-dark);margin-top:.3rem}
.prin{
  padding-left:clamp(1rem,1.8vw,1.8rem);
  border-left:1px solid var(--line-light);
}
.prin__num{
  font-family:var(--ff-disp);font-weight:600;font-size:2.4rem;
  color:var(--accent);letter-spacing:.02em;margin-bottom:1.1rem;line-height:1;
}
.prin__title{font-size:1.18rem;font-weight:700;color:var(--txt-dark);margin-bottom:1rem;line-height:1.4}
.prin__desc{color:var(--txt-dark-mut);font-size:.95rem;line-height:1.9}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{background:#08080a;padding-top:clamp(3.5rem,6vw,5.5rem)}
.footer__top{
  display:grid;grid-template-columns:1.25fr 2.5fr 1.25fr;gap:clamp(2rem,4vw,3.5rem);align-items:start;
  padding-bottom:3.2rem;border-bottom:1px solid var(--line-dark);
}
.footer__logo{height:42px;width:auto;margin-bottom:1.3rem}
.footer__tagline{color:var(--txt-mut);font-size:.95rem;line-height:1.9}
.footer__social{display:flex;gap:.65rem;margin-top:1.7rem}
.footer__social a{
  width:36px;height:36px;border-radius:50%;border:1px solid var(--line-dark);
  display:grid;place-items:center;color:var(--txt-mut);transition:.3s;
}
.footer__social a:hover{border-color:var(--accent);background:var(--accent);color:#fff;transform:translateY(-2px)}
.footer__social svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.footer__cols{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.footer__col h4{font-size:1rem;font-weight:700;color:#fff;margin-bottom:1.25rem;letter-spacing:.04em}
.footer__col a{display:block;color:var(--txt-mut);font-size:.9rem;padding:.36em 0;transition:color .25s,transform .25s}
.footer__col a:hover{color:var(--accent);transform:translateX(3px)}
.footer__phones{display:none} /* 电话号码仅在手机版页脚显示，电脑端保持不变 */
.footer__phones a{color:#fff;font-weight:600;letter-spacing:.02em}
.footer__qr{display:flex;align-items:center;gap:1rem}
.footer__qrbox{
  width:100px;height:100px;flex:none;border-radius:6px;
  background:#fff;object-fit:contain;padding:4px;
}
.footer__qrtxt{display:flex;flex-direction:column;gap:.4rem}
.footer__qrtxt b{color:#fff;font-size:.92rem;font-weight:700;letter-spacing:.02em}
.footer__qrtxt span{color:var(--txt-mut);font-size:.82rem;line-height:1.5}
.footer__bar{padding:1.6rem 0}
.footer__barinner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:.6rem;color:#56565c;font-size:.82rem;letter-spacing:.03em}

/* ============================================================
   reveal animations
   ============================================================ */
.reveal,.reveal-up{opacity:0;will-change:transform,opacity}
.reveal{transform:translateY(26px)}
.reveal-up{transform:translateY(38px)}
.reveal.is-in,.reveal-up.is-in{
  opacity:1;transform:none;
  transition:opacity .9s cubic-bezier(.16,.8,.3,1) var(--d,0s),transform .9s cubic-bezier(.16,.8,.3,1) var(--d,0s);
}
@media(prefers-reduced-motion:reduce){
  .reveal,.reveal-up{opacity:1;transform:none}
  .hero__bg{animation:none;transform:none}
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media(max-width:960px){
  .nav__links,.nav__cta{display:none}
  .nav__links.is-open{
    display:flex;flex-direction:column;position:absolute;top:78px;left:0;right:0;
    background:rgba(12,12,14,.97);padding:1.5rem 6vw 2rem;gap:1.1rem;border-bottom:1px solid var(--line-dark);
  }
  .nav__burger{display:flex;margin-left:auto}
  .nav__logo img{height:46px}
  .nav__drop{flex-direction:column;align-items:flex-start;width:100%}
  .nav__caret{display:none}
  .nav__sub{position:static;transform:none;opacity:1;visibility:visible;background:none;border:0;box-shadow:none;backdrop-filter:none;min-width:0;padding:.2rem 0 .2rem 1.1rem}
  .nav__sub a{padding:.5rem 0}
  .nav__sub a:hover{background:none;padding-left:0}
  .about__grid,.system__grid{grid-template-columns:1fr;gap:2.5rem}
  .system__media{order:-1;position:static;width:auto}
  .system__media img{height:auto;object-fit:contain;border-radius:4px;-webkit-mask-image:none;mask-image:none;box-shadow:0 30px 60px -28px rgba(0,0,0,.45)}
  .concept__grid{grid-template-columns:1fr;gap:0;align-items:stretch}
  .concept__head .eyebrow{position:static;margin-bottom:1.1rem}
  .concept__col{border-left:0;border-top:1px solid var(--line-dark);padding:1.6rem 0;align-items:baseline}
  .concept__char{font-size:clamp(4.5rem,18vw,7rem)}
  .principles__grid{grid-template-columns:1fr 1fr}
  .principles__head{grid-column:1 / -1;margin-bottom:.5rem}
  .prin{border-left:0;border-top:1px solid var(--line-light);padding:1.5rem 0 0}
  .footer__top{grid-template-columns:1fr;gap:2.5rem}
  .footer__qr{justify-self:start;text-align:left}
  .footer__qrbox{margin:0 0 .8rem}
  .footer__phones{display:block} /* 手机版：电话紧接"联系方式"下方，与各项对齐、间距一致 */
  .is-mobile-hidden{display:none} /* 手机版首页页脚：整块"联系我们"栏不显示，其余页面/电脑端不受影响 */
}
@media(max-width:560px){
  .footer__cols{grid-template-columns:1fr 1fr}
  .principles__grid{grid-template-columns:1fr}
  .hero__sub{font-size:1.05rem}
  .system__tags{flex-direction:column;gap:.9rem}
}