/* 朱彦文品牌官网 · 纯静态
   品牌色：蓝 #2f86ad / 深蓝 #1e4055 / 朱红 #d96c3f / 米白 #faf6ef */
:root{
  --blue:#2f86ad; --navy:#1e4055; --red:#d96c3f;
  --cream:#faf6ef; --cream2:#f3ecdf; --ink:#2b3a44; --muted:#6b7a85;
  --serif:"Songti SC","STSong","Noto Serif SC",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:var(--sans);color:var(--ink);background:var(--cream);line-height:1.75;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}

/* 导航 */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(250,246,239,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(30,64,85,.08)}
.nav-inner{max-width:1080px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between}
.nav-brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-size:20px;font-weight:700;color:var(--navy)}
.nav-brand img{width:38px;height:38px;border-radius:50%}
.nav-brand i{font-style:normal;font-size:13px;color:var(--blue);margin-left:2px;letter-spacing:2px}
.nav-links{display:flex;gap:28px}
.nav-links a{font-size:15px;color:var(--navy);position:relative;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;background:var(--red);transition:right .25s}
.nav-links a:hover::after,.nav-links a.on::after{right:0}
.nav-toggle{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--navy);margin:5px auto;transition:.25s}

/* 首屏 */
.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;position:relative;padding:96px 24px 64px;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(ellipse 60% 45% at 50% 0%,rgba(47,134,173,.10),transparent),
  radial-gradient(ellipse 45% 35% at 85% 90%,rgba(217,108,63,.08),transparent),
  var(--cream)}
.hero-inner{position:relative;max-width:760px}
.hero-logo{width:min(400px,72vw);margin:0 auto 8px;mix-blend-mode:multiply;filter:drop-shadow(0 12px 30px rgba(30,64,85,.10))}
.hero h1{font-family:var(--serif);font-size:clamp(34px,6vw,58px);color:var(--navy);letter-spacing:4px;margin:8px 0 14px}
.hero h1 em{font-style:normal;color:var(--red)}
.hero h1 .nw{white-space:nowrap}
.hero-sub{font-size:clamp(16px,2.4vw,20px);color:var(--blue);letter-spacing:1px;font-weight:600}
.hero-note{color:var(--muted);margin-top:8px;font-size:15px}
.hero-cta{margin-top:32px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 34px;border-radius:999px;font-size:16px;letter-spacing:1px;transition:.25s}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 6px 18px rgba(47,134,173,.35)}
.btn-primary:hover{background:#25708f;transform:translateY(-2px)}
.btn-ghost{border:1.5px solid var(--navy);color:var(--navy)}
.btn-ghost:hover{background:var(--navy);color:#fff}
.hero-scroll{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);font-size:26px;color:var(--blue);animation:bob 1.8s infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}

/* 章节通用 */
.section{padding:88px 0}
.section-alt{background:#fff}
.section-warm{background:var(--cream2)}
.sec-head{text-align:center;margin-bottom:52px}
.sec-tag{display:inline-block;font-size:13px;letter-spacing:4px;color:var(--red);border:1px solid rgba(217,108,63,.4);border-radius:999px;padding:4px 16px;margin-bottom:14px}
.sec-head h2{font-family:var(--serif);font-size:clamp(26px,4.2vw,38px);color:var(--navy);letter-spacing:2px}
.sec-sub{color:var(--muted);margin-top:10px;font-size:15px}
.m-only{display:none}

/* 品牌介绍 */
.intro-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:48px;align-items:start}
.intro-text p{margin-bottom:16px}
.intro-text b{color:var(--blue)}
.intro-quote{font-family:var(--serif);font-size:19px;color:var(--navy);border-left:4px solid var(--red);padding-left:16px;margin-top:22px}
.intro-points{list-style:none;display:grid;gap:16px}
.intro-points li{background:#fff;border-radius:14px;padding:18px 22px;box-shadow:0 4px 16px rgba(30,64,85,.06)}
.intro-points b{display:block;font-family:var(--serif);font-size:20px;color:var(--red);margin-bottom:2px}
.intro-points span{color:var(--muted);font-size:14px}

/* 时间线 */
.timeline{max-width:720px;margin:0 auto;position:relative;padding-left:30px}
.timeline::before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:2px;background:linear-gradient(var(--blue),rgba(47,134,173,.15))}
.tl-item{position:relative;margin-bottom:38px}
.tl-item::before{content:"";position:absolute;left:-29px;top:8px;width:12px;height:12px;border-radius:50%;background:var(--red);box-shadow:0 0 0 4px rgba(217,108,63,.18)}
.tl-year{font-family:var(--serif);font-size:18px;font-weight:700;color:var(--blue);margin-bottom:4px}
.tl-body h3{font-size:18px;color:var(--navy);margin-bottom:6px}
.tl-body p{color:#4a5a64;font-size:15px}

/* 产品 */
.prod-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.prod-card{position:relative;background:#fff;border-radius:18px;padding:34px 28px;box-shadow:0 6px 22px rgba(30,64,85,.07);transition:.28s;border-top:4px solid transparent}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 14px 34px rgba(30,64,85,.13);border-top-color:var(--blue)}
.prod-main{border-top-color:var(--red)}
.prod-icon{width:74px;height:74px;color:var(--blue);margin-bottom:16px}
.prod-main .prod-icon{color:var(--red)}
.prod-card h3{font-family:var(--serif);font-size:21px;color:var(--navy);margin-bottom:8px}
.prod-card p{font-size:14.5px;color:#4a5a64}
.prod-tag{position:absolute;top:18px;right:18px;background:var(--red);color:#fff;font-size:12px;padding:3px 12px;border-radius:999px;letter-spacing:2px}
.prod-note{text-align:center;color:var(--muted);font-size:13px;margin-top:26px}

/* 品质坚持（深蓝底） */
.section-blue{background:linear-gradient(160deg,var(--navy),#16324a)}
.sec-head-light h2{color:#fff}
.sec-head-light .sec-tag{color:#f2b28f;border-color:rgba(242,178,143,.45)}
.str-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.str-item{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:28px 22px;text-align:center;color:#dce8ef;transition:.25s}
.str-item:hover{background:rgba(255,255,255,.1);transform:translateY(-4px)}
.str-item i{font-style:normal;font-family:var(--serif);display:inline-flex;width:54px;height:54px;align-items:center;justify-content:center;border-radius:50%;background:var(--red);color:#fff;font-size:24px;margin-bottom:14px}
.str-item h3{color:#fff;font-size:17px;margin-bottom:8px}
.str-item p{font-size:13.5px;color:#b8cdd9}

/* 品牌文化 */
.cul-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:56px}
.cul-card{background:#fff;border-radius:16px;padding:30px;box-shadow:0 5px 18px rgba(30,64,85,.06);border-left:4px solid var(--blue)}
.cul-card h3{font-family:var(--serif);color:var(--navy);font-size:19px;margin-bottom:10px}
.cul-card p{font-size:15px;color:#4a5a64}
.vision{background:#fff;border-radius:18px;padding:36px 32px;box-shadow:0 5px 18px rgba(30,64,85,.06)}
.vision h3{font-family:var(--serif);font-size:21px;color:var(--navy);text-align:center;margin-bottom:26px}
.vision h3 span{font-size:13px;color:var(--red);font-family:var(--sans);margin-left:6px}
.vision-line{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:10px;counter-reset:v}
.vision-line li{text-align:center;padding:14px 8px;border-radius:12px;background:var(--cream)}
.vision-line b{display:block;font-family:var(--serif);font-size:19px;color:var(--blue)}
.vision-line span{font-size:12.5px;color:var(--muted);display:block;margin-top:4px}

/* 加盟 */
.join-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.join-card{background:#fff;border-radius:16px;padding:26px 22px;box-shadow:0 5px 16px rgba(30,64,85,.06);transition:.25s}
.join-card:hover{transform:translateY(-4px)}
.join-card h3{color:var(--red);font-family:var(--serif);font-size:18px;margin-bottom:8px}
.join-card p{font-size:14px;color:#4a5a64}
.join-cta{text-align:center;margin-top:46px;background:#fff;border:1.5px dashed rgba(217,108,63,.5);border-radius:16px;padding:30px}
.join-cta p{font-family:var(--serif);font-size:19px;color:var(--navy)}
.join-cta .join-sub{font-family:var(--sans);font-size:14px;color:var(--muted);margin-top:6px}

/* 页脚 */
.footer{background:var(--navy);padding:56px 0 40px;text-align:center;color:#9fb9c9}
.footer-logo{width:190px;margin:0 auto 18px;border-radius:10px}
.footer-slogan{font-family:var(--serif);font-size:19px;color:#fff;letter-spacing:3px;margin-bottom:14px}
.footer-meta{font-size:14px}
.footer-copy{color:#6f8999}

/* 滚动入场 */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s,transform .6s}
.reveal.in{opacity:1;transform:none}

/* 响应式 */
@media (max-width:900px){
  .prod-grid,.cul-grid{grid-template-columns:1fr 1fr}
  .str-grid,.join-grid{grid-template-columns:1fr 1fr}
  .vision-line{grid-template-columns:1fr;gap:8px}
  .vision-line li{display:flex;align-items:baseline;gap:14px;text-align:left;padding:12px 18px}
}
@media (max-width:640px){
  .m-only{display:inline}
  .nav-links{position:fixed;top:64px;left:0;right:0;background:var(--cream);flex-direction:column;gap:0;max-height:0;overflow:hidden;transition:max-height .3s;box-shadow:0 12px 24px rgba(30,64,85,.12)}
  .nav-links.open{max-height:420px}
  .nav-links a{padding:14px 28px;border-bottom:1px solid rgba(30,64,85,.06)}
  .nav-toggle{display:block}
  .nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .section{padding:60px 0}
  .intro-grid{grid-template-columns:1fr;gap:28px}
  .prod-grid,.cul-grid,.str-grid,.join-grid{grid-template-columns:1fr}
  .hero{min-height:92vh}
}