/* ============================================================
   途邦 TUBANG · 全站样式
   米白印刷画册风 · 手机优先（320–430px），≥768px 顶部导航
   ============================================================ */

:root{
  --paper:#FBFAF7;
  --ink:#33322E;
  --ink-2:#6E6A5F;
  --ink-3:#9A9484;
  --hair:#D9D3C6;
  --brown:#6A5A44;
  --gold:#B9A780;
  --tabbar-h:56px;
}

*{box-sizing:border-box;margin:0;padding:0;}
html{-webkit-text-size-adjust:100%;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
  /* 给固定底栏留出空间（含 iPhone 底部安全区） */
  padding-bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom));
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer;}

/* ---------- 版式基建 ---------- */
.container{max-width:640px;margin:0 auto;padding:0 20px;}
.hairline{height:1px;background:var(--hair);border:none;}
.tick{width:52px;height:2px;background:var(--gold);}
.section-title{
  font-size:22px;font-weight:600;letter-spacing:4px;color:var(--ink);
}
.section-sub{
  font-size:13px;letter-spacing:2px;color:var(--ink-3);margin-top:6px;
}
.section-head{padding:34px 0 18px;}
.section-head .tick{margin-top:14px;}

/* ---------- 页头品牌条 ---------- */
.page-head{padding:26px 0 0;}
.brand-row{display:flex;align-items:center;gap:11px;}
.brand-row .logo-mark{flex:0 0 auto;}
.brand-row .cn{font-size:20px;font-weight:600;letter-spacing:3px;line-height:1;}
.brand-row .en{font-size:9px;letter-spacing:5px;color:var(--ink-3);margin-top:4px;line-height:1;}
.page-head .hairline{margin:16px 0 0;}

/* ---------- 通用卡片 ---------- */
.card{
  background:#fff;
  border:1px solid var(--hair);
  overflow:hidden;
}

/* ============================================================
   以下为组件样式（导航 / 占位卡 / lightbox / reveal / 轮播 / 页面组件）
   ============================================================ */

/* ---------- 底部导航（手机） ---------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  height:calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);
  display:flex;
  background:rgba(251,250,247,.96);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  border-top:1px solid var(--hair);
}
.tab{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:3px;color:var(--ink-3);font-size:11px;letter-spacing:1px;
}
.tab svg{width:22px;height:22px;}
.tab-on{color:var(--brown);font-weight:600;}

/* ---------- 占位卡 / 图片容器 ---------- */
.img-wrap{aspect-ratio:4/3;background:#F1EEE6;}
.img-wrap img{width:100%;height:100%;object-fit:cover;}
.ph-card{
  aspect-ratio:4/3;background:#F4F1EA;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
}
.ph-mark{opacity:.55;line-height:0;}
.ph-text{font-size:11px;letter-spacing:3px;color:var(--ink-3);}

/* ---------- 产品 ---------- */
.cat-tabs{display:flex;gap:8px;padding:18px 0 16px;}
.cat-tab{
  flex:1;padding:9px 0;text-align:center;
  font-size:14px;letter-spacing:2px;color:var(--ink-2);
  border:1px solid var(--hair);background:#fff;
  transition:color .25s,border-color .25s;
}
.cat-tab-on{color:var(--brown);font-weight:600;border-color:var(--brown);}
.p-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding-bottom:34px;}
.p-info{padding:10px 12px 12px;}
.p-name{font-size:15px;font-weight:600;letter-spacing:1.5px;}
.p-tag{font-size:12px;color:var(--ink-2);margin-top:3px;line-height:1.5;min-height:36px;}
.p-price{font-size:14px;font-weight:600;color:var(--brown);margin-top:7px;letter-spacing:.5px;}

/* ---------- 案例 ---------- */
.case-list{display:flex;flex-direction:column;gap:16px;padding-bottom:34px;}
.case-card .img-wrap,.case-card .ph-card{aspect-ratio:3/2;}
.case-title{padding:10px 14px 12px;font-size:13px;letter-spacing:2px;color:var(--ink-2);}

/* ---------- Lightbox ---------- */
.lightbox{
  position:fixed;inset:0;z-index:100;display:none;
  align-items:center;justify-content:center;
  background:rgba(24,22,18,.92);
}
.lightbox-on{display:flex;}
.lightbox img{max-width:96vw;max-height:88vh;object-fit:contain;}

/* ---------- 滚动渐入 ---------- */
.reveal{opacity:0;transform:translateY(18px);
  transition:opacity .6s ease,transform .6s ease;}
.reveal-in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none;}
}

/* ---------- 轮播 ---------- */
.carousel{position:relative;}
.carousel-track{
  display:flex;overflow-x:auto;
  scroll-snap-type:x mandatory;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:none;
}
.carousel-track::-webkit-scrollbar{display:none;}
.carousel-slide{
  flex:0 0 100%;scroll-snap-align:start;
  position:relative;aspect-ratio:4/3;overflow:hidden;
}
.carousel-slide img{width:100%;height:100%;object-fit:cover;}
.carousel-slide .ph-card{aspect-ratio:auto;height:100%;}
.carousel-dots{
  position:absolute;left:0;right:0;bottom:12px;z-index:6;
  display:flex;justify-content:center;gap:7px;
}
.dot{width:6px;height:6px;border-radius:50%;background:rgba(255,255,255,.55);
  box-shadow:0 0 3px rgba(0,0,0,.25);transition:background .3s;}
.dot-on{background:#fff;}

/* ---------- 品牌页 ---------- */
.brand-hero{text-align:center;padding:56px 0 10px;}
.brand-hero .logo-mark{display:inline-block;}
.brand-hero-cn{font-size:30px;font-weight:600;letter-spacing:8px;margin-top:14px;}
.brand-hero-en{font-size:11px;letter-spacing:7px;color:var(--ink-3);margin-top:6px;}
.brand-slogan{font-size:17px;letter-spacing:4px;color:var(--ink-2);margin-top:22px;}
.brand-intro{
  font-size:14px;color:var(--ink-2);line-height:1.9;
  text-align:left;margin:26px 0 8px;
}
.point-item{
  display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--hair);
}
.point-num{
  font-size:24px;font-weight:600;color:var(--gold);
  font-family:Georgia,"Times New Roman",serif;line-height:1.1;flex:0 0 38px;
}
.point-title{font-size:16px;font-weight:600;letter-spacing:2px;}
.point-desc{font-size:13px;color:var(--ink-2);margin-top:4px;line-height:1.7;}
.craft-step{display:flex;gap:14px;padding:14px 0;}
.craft-dot{
  flex:0 0 9px;height:9px;border-radius:50%;background:var(--brown);
  margin-top:7px;position:relative;
}
.craft-step:not(:last-of-type) .craft-dot::after{
  content:"";position:absolute;left:4px;top:13px;width:1px;height:52px;background:var(--hair);
}
.craft-name{font-size:15px;font-weight:600;letter-spacing:2px;}
.craft-desc{font-size:13px;color:var(--ink-2);margin-top:2px;}
.site-foot{padding:40px 0 30px;text-align:center;}
.site-foot .foot-text{
  font-size:11px;letter-spacing:3px;color:var(--ink-3);margin-top:18px;
}

/* ---------- 首页 ---------- */
.home-hero{position:relative;}
.hero-ph{height:100%;background:linear-gradient(150deg,#B4AC9C 0%,#8E8878 55%,#6E6858 100%);}
.hero-overlay{
  position:absolute;inset:0;z-index:5;pointer-events:none;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
  background:linear-gradient(to bottom,rgba(30,27,22,.18),rgba(30,27,22,.38));
  color:#FBFAF7;text-shadow:0 1px 8px rgba(0,0,0,.35);
}
.hero-overlay .hero-cn{font-size:28px;font-weight:600;letter-spacing:7px;}
.hero-overlay .hero-en{font-size:10px;letter-spacing:6px;opacity:.85;}
.hero-overlay .hero-slogan{font-size:14px;letter-spacing:3px;margin-top:8px;}
.points-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:22px 0 6px;}
.points-row .pt{border-left:2px solid var(--gold);padding-left:10px;}
.points-row .pt-t{font-size:13px;font-weight:600;letter-spacing:1px;}
.points-row .pt-d{font-size:11px;color:var(--ink-3);margin-top:3px;line-height:1.5;}
.entry-list{display:flex;flex-direction:column;gap:12px;}
.entry-card{display:flex;align-items:stretch;}
.entry-card .img-wrap,.entry-card .ph-card{flex:0 0 128px;aspect-ratio:4/3;}
.entry-info{flex:1;padding:12px 14px;display:flex;flex-direction:column;justify-content:center;}
.entry-name{font-size:16px;font-weight:600;letter-spacing:2.5px;}
.entry-desc{font-size:12px;color:var(--ink-2);margin-top:4px;}
.entry-go{font-size:12px;color:var(--brown);margin-top:8px;letter-spacing:1px;}
.more-link{
  display:block;text-align:center;font-size:13px;letter-spacing:2px;
  color:var(--brown);padding:14px 0 34px;
}

/* ---------- 桌面端（≥768px）：底栏变顶栏，仅保证不乱 ---------- */
@media (min-width:768px){
  body{
    padding-bottom:0;
    padding-top:64px;
  }
  .tabbar{
    top:0;bottom:auto;height:56px;padding-bottom:0;
    justify-content:center;gap:44px;
    border-top:none;border-bottom:1px solid var(--hair);
  }
  .tab{flex:0 0 auto;flex-direction:row;gap:7px;font-size:14px;}
  .tab svg{width:18px;height:18px;}
  .container{max-width:720px;}
}