/* ===== 半程咖影 · 原型共享样式 ===== */
:root{
  --paper:#F8F6F1;
  --paper-2:#F1ECE3;
  --ink:#1A1A1A;
  --muted:#7A766E;
  --line:#DED8CD;
  --brand:#2F5D50;

  --c-sport:#2E5D46;
  --c-photo:#3A3A3A;
  --c-coffee:#B85C49;
  --c-coffee-bg:#F5F0E8;
  --c-tech:#1E1E24;
  --c-tech-accent:#22D3EE;

  --serif:"Noto Serif SC",Songti SC,SimSun,serif;
  --sans:"Noto Sans SC",system-ui,-apple-system,"PingFang SC",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SF Mono,Menlo,monospace;

  --radius:22px;
  --radius-sm:14px;
  --shadow:0 24px 60px -20px rgba(0,0,0,.18);
  --shadow-sm:0 8px 24px -10px rgba(0,0,0,.12);
}

*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:var(--sans);background:var(--paper);color:var(--ink);line-height:1.7;-webkit-font-smoothing:antialiased;}
a{color:inherit;text-decoration:none;}
img{display:block;max-width:100%;}

/* 字体 */
.serif{font-family:var(--serif);}
.mono{font-family:var(--mono);}

/* 导航 */
.proto-nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:18px 28px;display:flex;align-items:center;justify-content:space-between;mix-blend-mode:difference;color:#fff;}
.proto-nav .brand{font-family:var(--serif);font-weight:900;font-size:20px;letter-spacing:.04em;}
.proto-nav .brand small{font-family:var(--mono);font-size:10px;font-weight:400;opacity:.7;display:block;margin-top:2px;}
.proto-nav .nav-links{display:flex;gap:6px;}
.proto-nav .nav-links a{font-size:13px;padding:8px 14px;border-radius:99px;color:rgba(255,255,255,.85);transition:.2s;}
.proto-nav .nav-links a:hover{background:rgba(255,255,255,.15);color:#fff;}
.proto-nav .nav-links a.active{background:#fff;color:#000;}

/* 统一按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:99px;font-size:14px;font-weight:500;transition:.2s;cursor:pointer;border:0;}
.btn-primary{background:var(--ink);color:var(--paper);}
.btn-primary:hover{opacity:.85;}
.btn-ghost{background:transparent;border:1px solid currentColor;color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:var(--paper);}

/* 页脚 */
.proto-footer{border-top:1px solid var(--line);padding:40px 28px;font-size:13px;color:var(--muted);}
.proto-footer .inner{max-width:1280px;margin:0 auto;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;}

/* 通用卡片 */
.card{border-radius:var(--radius);overflow:hidden;transition:.3s;}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);}

/* 页面顶部小导航（浅色背景用） */
.page-topbar{position:fixed;top:0;left:0;right:0;z-index:100;padding:18px 28px;display:flex;justify-content:space-between;align-items:center;background:var(--paper);border-bottom:1px solid var(--line);}
.page-topbar .brand{font-family:var(--serif);font-weight:900;font-size:18px;letter-spacing:.04em;color:var(--ink);}
.page-topbar .back{font-size:13px;color:var(--muted);transition:.2s;}
.page-topbar .back:hover{color:var(--brand);}

/* 图片兜底占位 */
.img-fallback{background:var(--line);display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:14px;min-height:220px;}

/* 回到顶部 */
.back-to-top{position:fixed;right:22px;bottom:22px;z-index:90;width:44px;height:44px;border-radius:50%;background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .25s,visibility .25s,transform .25s;box-shadow:var(--shadow-sm);border:1px solid var(--line);}
.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0);}
.back-to-top:hover{opacity:.85;}
.back-to-top svg{width:18px;height:18px;}

/* 小红书底部区块 */
.xhs-band{border-top:1px solid var(--line);background:#fff;padding:60px 28px;}
.xhs-inner{max-width:1200px;margin:0 auto;}
.xhs-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:28px;flex-wrap:wrap;}
.xhs-title{font-family:var(--serif);font-weight:900;font-size:clamp(26px,3vw,34px);display:flex;align-items:center;gap:10px;}
.xhs-title .dot{width:10px;height:10px;border-radius:50%;background:#FF2442;}
.xhs-lead{font-size:14px;color:var(--muted);max-width:420px;line-height:1.6;}
.xhs-link{font-size:13px;color:#FF2442;font-weight:500;transition:.2s;white-space:nowrap;}
.xhs-link:hover{opacity:.75;}
.xhs-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.xhs-card{border:1px solid var(--line);border-radius:18px;overflow:hidden;background:var(--paper);transition:.25s;cursor:pointer;}
.xhs-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm);}
.xhs-card img{width:100%;height:160px;object-fit:cover;background:var(--line);}
.xhs-card .xc-body{padding:16px;}
.xhs-card .xc-tag{font-family:var(--mono);font-size:10px;color:#FF2442;letter-spacing:.04em;margin-bottom:6px;}
.xhs-card .xc-title{font-family:var(--serif);font-weight:700;font-size:16px;margin-bottom:6px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.xhs-card .xc-desc{font-size:12.5px;color:var(--muted);line-height:1.55;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}

/* 移动端 */
@media(max-width:760px){
  .proto-nav{padding:14px 18px;}
  .proto-nav .nav-links{display:none;}
  .proto-nav .brand{font-size:18px;}
  .page-topbar{padding:14px 18px;}
  .xhs-grid{grid-template-columns:repeat(2,1fr);}
  .xhs-head{flex-direction:column;align-items:flex-start;}
}
@media(max-width:560px){
  .xhs-grid{grid-template-columns:1fr;}
  .back-to-top{right:14px;bottom:14px;width:40px;height:40px;}
}