/* ===================================================
   甘牧食品官网 — 现代化样式
   主色：橙 #E8862D / 绿 #4E8B4A / 米 #FAF6EF
   =================================================== */
:root{
  --orange:#E8862D;
  --orange-deep:#C96A15;
  --green:#4E8B4A;
  --green-light:#6BA84F;
  --ink:#3A3226;
  --ink-soft:#7A6F5D;
  --cream:#FAF6EF;
  --card:#FFFFFF;
  --line:#EAE0D0;
  --radius:14px;
  --shadow:0 10px 30px rgba(90,64,30,.08);
  --font:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Noto Sans SC",system-ui,sans-serif;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{font-family:var(--font);color:var(--ink);background:var(--cream);line-height:1.7;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:min(1120px,92%);margin:0 auto}

/* ---------- 顶部导航 ---------- */
.site-header{position:fixed;left:0;top:0;width:100%;z-index:50;background:rgba(250,246,239,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px}
.logo img{height:44px;width:auto}
.main-nav{display:flex;gap:6px}
.main-nav a{padding:8px 14px;border-radius:8px;font-size:15px;color:var(--ink-soft);transition:.25s}
.main-nav a:hover{color:var(--orange-deep);background:rgba(232,134,45,.1)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;padding:8px;cursor:pointer}
.nav-toggle span{width:24px;height:2.5px;background:var(--ink);border-radius:2px;transition:.3s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;padding-top:72px}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-mask{position:absolute;inset:0;background:linear-gradient(100deg,rgba(38,26,12,.72) 0%,rgba(38,26,12,.42) 46%,rgba(38,26,12,.12) 100%)}
.hero-content{position:relative;z-index:2;color:#FFF8EE;padding:0}
.hero-sub{display:inline-block;font-size:14px;letter-spacing:.35em;padding:6px 14px;border:1px solid rgba(255,232,200,.5);border-radius:999px;margin-bottom:22px;color:#FFE3BE}
.hero h1{font-family:var(--serif);font-size:clamp(30px,5vw,56px);font-weight:700;letter-spacing:.06em;line-height:1.35;text-shadow:0 4px 24px rgba(0,0,0,.35)}
.hero-title-desc{margin-top:14px;font-size:17px;color:rgba(255,240,220,.9)}
.hero-actions{margin-top:36px;display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 34px;border-radius:999px;font-size:16px;cursor:pointer;transition:.25s;border:1.5px solid transparent}
.btn-primary{background:linear-gradient(135deg,var(--orange),var(--orange-deep));color:#fff;box-shadow:0 8px 20px rgba(201,106,21,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(201,106,21,.45)}
.btn-ghost{border-color:rgba(255,232,200,.7);color:#FFE3BE}
.btn-ghost:hover{background:rgba(255,232,200,.14)}
.btn-block{width:100%;margin-top:20px}
.scroll-hint{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);width:26px;height:44px;border:2px solid rgba(255,240,220,.75);border-radius:14px;z-index:2}
.scroll-hint::before{content:"";position:absolute;left:50%;top:8px;width:4px;height:9px;margin-left:-2px;border-radius:2px;background:rgba(255,240,220,.85);animation:drop 1.6s infinite}
@keyframes drop{0%{transform:translateY(0);opacity:1}70%{transform:translateY(16px);opacity:0}100%{opacity:0}}

/* ---------- 区块通用 ---------- */
.section{padding:88px 0}
.section-alt{background:#FFFDF9;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{margin-bottom:44px}
.section-head h2{font-family:var(--serif);font-size:clamp(26px,3vw,36px);letter-spacing:.08em;position:relative;display:inline-block;padding-bottom:14px}
.section-head h2::after{content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:0;width:44px;height:3px;border-radius:2px;background:linear-gradient(90deg,var(--orange),var(--green))}
.section-head p{margin-top:10px;color:var(--ink-soft);font-size:15px}
.about-grid .section-head h2::after,.about-text .section-head h2::after{left:0;transform:none}

/* ---------- 品牌 ---------- */
.brand-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:22px}
.brand-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px 22px;text-align:center;box-shadow:var(--shadow);transition:.3s}
.brand-card:hover{transform:translateY(-6px);border-color:rgba(232,134,45,.45)}
.brand-mark{width:64px;height:64px;margin:0 auto 16px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:30px;color:#fff;background:linear-gradient(135deg,var(--green-light),var(--green))}
.brand-card:nth-child(even) .brand-mark{background:linear-gradient(135deg,var(--orange),var(--orange-deep))}
.brand-card h3{font-family:var(--serif);font-size:21px;letter-spacing:.06em}
.brand-card p{margin-top:8px;font-size:13.5px;color:var(--ink-soft)}

/* ---------- 产品 ---------- */
.product-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px}
.product-card{position:relative;background:var(--card);border-radius:var(--radius);padding:30px 26px 26px;box-shadow:var(--shadow);border-top:3px solid transparent;transition:.3s}
.product-card::before{content:"";position:absolute;inset:0;border-radius:var(--radius);background:linear-gradient(135deg,rgba(232,134,45,.06),rgba(78,139,74,.06));opacity:0;transition:.3s}
.product-card:hover{transform:translateY(-5px);border-top-color:var(--orange)}
.product-card:hover::before{opacity:1}
.product-card h3{font-family:var(--serif);font-size:20px;margin-bottom:8px;position:relative}
.product-card h3::after{content:"·";color:var(--orange);margin-left:6px;font-weight:700}
.product-card p{font-size:14.5px;color:var(--ink-soft);position:relative}

/* ---------- 关于 ---------- */
.about-grid{display:grid;grid-template-columns:1.7fr 1fr;gap:48px;align-items:start}
.intro-line{font-size:16px;margin-bottom:14px;padding-left:16px;border-left:3px solid rgba(232,134,45,.35)}
.about-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;box-shadow:var(--shadow);position:sticky;top:96px}
.about-card h3{font-family:var(--serif);font-size:20px;margin-bottom:18px;letter-spacing:.05em}
.about-card dl div{display:flex;gap:14px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:14.5px}
.about-card dl div:last-of-type{border-bottom:0}
.about-card dt{color:var(--ink-soft);flex:0 0 64px}
.about-card dd{font-weight:600}

/* ---------- 页脚 ---------- */
.site-footer{background:#2E2618;color:#D8CCB4;padding:56px 0 34px;margin-top:20px}
.vision{display:flex;align-items:center;gap:18px;justify-content:center;flex-wrap:wrap;padding-bottom:26px;border-bottom:1px solid rgba(216,204,180,.18)}
.vision img{max-height:70px;width:auto;object-fit:contain}
.vision p{font-family:var(--serif);font-size:18px;letter-spacing:.14em;color:#F3E7CE}
.footer-info{text-align:center;margin-top:24px;font-size:13px;color:#A99C82}
.footer-info p{margin:6px 0}
.footer-info a:hover{color:var(--orange)}

/* ---------- 返回顶部 ---------- */
.back-top{position:fixed;right:26px;bottom:30px;width:46px;height:46px;border-radius:50%;border:0;cursor:pointer;color:#fff;background:linear-gradient(135deg,var(--orange),var(--orange-deep));box-shadow:0 8px 22px rgba(201,106,21,.4);display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transform:translateY(12px);transition:.3s;z-index:60}
.back-top.show{opacity:1;visibility:visible;transform:none}
.back-top:hover{transform:translateY(-3px)}

/* ---------- 入场动画 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---------- 响应式 ---------- */

/* 平板：关于区上下堆叠 */
@media (max-width:960px){
  .about-grid{grid-template-columns:1fr;gap:36px}
  .about-card{position:static}
  .section{padding:72px 0}
}

/* 小平板 / 大屏手机：汉堡菜单 */
@media (max-width:820px){
  .nav-toggle{display:flex}
  .header-inner{height:60px;gap:14px}
  .logo img{height:36px}
  .main-nav{
    position:fixed;left:0;right:0;top:60px;z-index:40;
    display:flex;flex-direction:column;gap:2px;
    background:rgba(250,246,239,.98);
    backdrop-filter:blur(12px);
    padding:12px 5% 18px;
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 40px rgba(90,64,30,.14);
    max-height:calc(100dvh - 60px);
    overflow-y:auto;
    transform:translateY(-130%);
    transition:transform .35s ease;
  }
  .main-nav.open{transform:none}
  .main-nav a{padding:14px 16px;font-size:16px;border-radius:10px}
  .main-nav a:active{background:rgba(232,134,45,.12)}
  .hero{min-height:100dvh;padding-top:60px}
  .hero-mask{background:linear-gradient(180deg,rgba(38,26,12,.55) 0%,rgba(38,26,12,.35) 45%,rgba(38,26,12,.62) 100%)}
  .section{padding:58px 0}
  .section-head{margin-bottom:32px}
  .scroll-hint{bottom:16px}
}

/* 手机：双栏品牌 / 单栏内容 */
@media (max-width:640px){
  .wrap{width:min(1120px,90%)}

  /* hero */
  .hero{align-items:flex-end;padding-top:60px;padding-bottom:52px}
  .hero-content{padding:0 0 4px}
  .hero-sub{font-size:11px;letter-spacing:.2em;padding:4px 10px;margin-bottom:14px}
  .hero h1{font-size:clamp(26px,8vw,38px);letter-spacing:.03em;line-height:1.3}
  .hero-title-desc{font-size:14px;margin-top:8px}
  .hero-actions{margin-top:22px;display:grid;grid-template-columns:1fr;gap:10px}
  .btn{width:100%;padding:12px 20px;font-size:15px}
  .scroll-hint{display:none}

  /* 区块标题 */
  .section-head h2{font-size:clamp(22px,6vw,28px);padding-bottom:10px}
  .section-head h2::after{width:36px;height:2.5px}
  .section-head p{font-size:13px;margin-top:6px}
  .section{padding:44px 0}

  /* 品牌卡片：强制两列，紧凑间距 */
  .brand-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .brand-card{padding:18px 10px 16px;border-radius:12px}
  .brand-mark{width:46px;height:46px;font-size:22px;margin-bottom:10px}
  .brand-card h3{font-size:16px;letter-spacing:.04em}
  .brand-card p{font-size:11.5px;line-height:1.5;margin-top:5px}

  /* 产品卡片：单列 */
  .product-grid{grid-template-columns:1fr;gap:12px}
  .product-card{padding:20px 18px}
  .product-card h3{font-size:17px}
  .product-card p{font-size:13.5px}

  /* 关于 */
  .about-grid{gap:28px}
  .intro-line{font-size:15px;padding-left:12px;margin-bottom:12px}
  .about-card{padding:24px 20px}
  .about-card h3{font-size:18px;margin-bottom:14px}
  .about-card dl div{font-size:13.5px;gap:10px;padding:9px 0}
  .about-card dt{flex-basis:60px}
  .about-card dd{word-break:break-all}

  /* 页脚 */
  .site-footer{padding:44px 0 calc(30px + env(safe-area-inset-bottom))}
  .vision{gap:14px;padding-bottom:20px}
  .vision img{max-height:56px}
  .vision p{font-size:15px;letter-spacing:.1em}
  .footer-info{font-size:12.5px;margin-top:20px;line-height:1.8}
  .footer-info p{word-break:break-all}

  /* 返回顶部 */
  .back-top{right:16px;bottom:calc(18px + env(safe-area-inset-bottom));width:42px;height:42px}
}

/* 超小屏微调（两列保持不变，只缩小细节） */
@media (max-width:360px){
  .logo img{height:32px}
  .brand-card{padding:14px 8px 12px}
  .brand-card h3{font-size:15px}
  .brand-card p{font-size:11px}
}