/* ============================================================
   医者AI路 · 国风设计 Token 库 v2（美化升级版）
   ------------------------------------------------------------
   用途：全站统一的视觉变量与通用组件类。
   v2 升级点：
     · 色彩微调更沉稳（纸色更暖、朱红更雅、墨绿更深）
     · 卡片增加回纹角饰、双层投影、更细腻的水墨扩散
     · 分区标题增加篆刻印章点缀
     · 新增 .reveal 滚动入场动画
     · 导航/页脚质感升级
   兼容：保留 v1 全部类名，旧页面引用本文件即可自动升级。
   ============================================================ */

:root{
  --paper:#f2e9d5;          /* 暖纸底（主） */
  --paper-2:#f9f3e4;        /* 暖纸底（次） */
  --card:#fffdf7;           /* 卡片底 */
  --ink:#2a2620;            /* 墨字（主） */
  --ink-soft:#6d6153;       /* 墨字（次） */
  --vermilion:#a83a2c;      /* 朱红（主强调） */
  --vermilion-d:#7e2a20;    /* 朱红（深） */
  --moss:#3a5648;           /* 墨绿（次强调） */
  --moss-soft:#5a7a68;
  --gold:#96652e;           /* 赭石金 */
  --qing:#45697a;           /* 青 */
  --line:rgba(140,110,60,.20);
  --shadow:0 6px 24px rgba(90,60,20,.10);
  --shadow-lg:0 18px 44px rgba(90,60,20,.16);
  --radius:16px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Serif SC","Songti SC","STSong",serif;
  color:var(--ink);
  background:
    linear-gradient(180deg, rgba(242,233,213,.88) 0%, rgba(249,243,228,.92) 45%, rgba(249,243,228,.95) 100%),
    url('/assets/bg-shanshui.jpg') center top / cover no-repeat fixed;
  min-height:100vh;
  line-height:1.7;
  padding:0 0 40px;
  position:relative;
}
/* 极淡宣纸纹理 */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:radial-gradient(circle at 1px 1px, rgba(140,110,60,.05) 1px, transparent 0);
  background-size:22px 22px;
  opacity:.7;
}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px;position:relative;z-index:1}

/* ===== 顶部品牌首屏 ===== */
.hero{
  text-align:center;
  padding:54px 20px 22px;
  position:relative;
}
.seal{
  width:56px;height:56px;margin:0 auto 16px;
  background:linear-gradient(145deg,var(--vermilion),var(--vermilion-d));
  color:var(--paper-2);
  border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-size:30px;font-weight:700;
  box-shadow:0 6px 18px rgba(168,58,44,.38), inset 0 1px 0 rgba(255,255,255,.18);
  transform:rotate(-4deg);
  position:relative;
  transition:transform .3s ease;
}
.seal:hover{transform:rotate(-4deg) scale(1.06)}
.seal::after{content:"";position:absolute;inset:4px;border:1px solid rgba(255,253,246,.45);border-radius:8px}
.brand{
  font-size:42px;font-weight:900;letter-spacing:4px;
  color:var(--ink);
  font-family:"Noto Serif SC","Songti SC",serif;
}
.brand .hl{color:var(--vermilion);position:relative}
.brand .hl::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:6px;
  background:linear-gradient(90deg,transparent,rgba(168,58,44,.22),transparent);
  border-radius:3px;
}
.tagline{
  margin-top:14px;font-size:16px;color:var(--moss);
  letter-spacing:2px;font-weight:600;
}
.subline{
  margin-top:8px;font-size:13px;color:var(--ink-soft);
}
.rule{
  width:150px;height:16px;margin:20px auto 0;
  background:
    radial-gradient(circle at 10px 8px,var(--vermilion) 0 3px,transparent 3px),
    radial-gradient(circle at 40px 8px,var(--moss) 0 3px,transparent 3px),
    radial-gradient(circle at 70px 8px,var(--gold) 0 3px,transparent 3px),
    radial-gradient(circle at 100px 8px,var(--vermilion) 0 3px,transparent 3px),
    radial-gradient(circle at 130px 8px,var(--moss) 0 3px,transparent 3px);
  opacity:.85;
}

/* 主视觉插画 */
.hero-img{
  max-width:560px;width:100%;border-radius:18px;
  border:1px solid var(--line);
  box-shadow:0 12px 40px rgba(90,60,20,.16);
  margin-top:20px;transition:transform .3s ease, box-shadow .3s ease;
}
.hero-img:hover{transform:scale(1.015);box-shadow:0 18px 52px rgba(90,60,20,.22)}

/* ===== 搜索 + 筛选 ===== */
.filterbar{margin:28px auto 6px;max-width:640px}
.searchbar{position:relative;max-width:460px;margin:0 auto}
.searchbar .si{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--ink-soft);font-size:16px}
.searchbar input{
  width:100%;padding:13px 16px 13px 44px;
  border:1px solid var(--line);border-radius:30px;
  background:var(--card);font-family:inherit;font-size:14px;color:var(--ink);
  box-shadow:var(--shadow);
  transition:border-color .2s, box-shadow .2s;
}
.searchbar input:focus{outline:none;border-color:var(--vermilion);box-shadow:0 0 0 3px rgba(168,58,44,.12)}
.searchbar input::placeholder{color:#a99c84}
.chips{display:flex;gap:9px;justify-content:center;flex-wrap:wrap;margin-top:14px}
.chip{
  padding:6px 16px;border:1px solid var(--line);border-radius:20px;
  background:var(--card);font-size:13px;color:var(--ink-soft);
  cursor:pointer;transition:.2s;font-family:inherit;user-select:none;
}
.chip:hover{border-color:var(--vermilion);color:var(--vermilion);transform:translateY(-1px)}
.chip.active{background:var(--vermilion);color:var(--paper-2);border-color:var(--vermilion);box-shadow:0 3px 10px rgba(168,58,44,.25)}

/* ===== 分区标题（带篆刻印章点缀） ===== */
.sec-title{
  display:flex;align-items:center;gap:12px;
  margin:44px 0 20px;
  font-size:22px;font-weight:700;color:var(--ink);
}
.sec-title .bar{
  width:6px;height:26px;border-radius:3px;
  background:linear-gradient(var(--vermilion),var(--vermilion-d));
  box-shadow:0 2px 6px rgba(168,58,44,.3);
}
.sec-title .en{font-size:12px;color:var(--ink-soft);font-weight:400;letter-spacing:1px;margin-left:2px}
/* 篆刻小印章 */
.sec-title .stamp{
  margin-left:auto;
  font-size:11px;color:var(--vermilion);
  border:1.5px solid var(--vermilion);
  border-radius:4px;padding:2px 8px;
  letter-spacing:2px;font-weight:600;
  transform:rotate(-2deg);
  opacity:.85;
  box-shadow:inset 0 0 0 1px rgba(168,58,44,.08);
}

/* ===== 网格 ===== */
.grid{display:grid;gap:18px}
.grid.hot{grid-template-columns:repeat(4,1fr)}
.grid.tools{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px 20px 18px;
  text-decoration:none;color:inherit;
  display:flex;flex-direction:column;
  box-shadow:var(--shadow);
  transition:transform .24s ease, box-shadow .24s ease, border-color .24s ease;
  position:relative;overflow:hidden;
  animation:fadeUp .5s both;
}
/* 回纹角饰（左上） */
.card .corner{
  position:absolute;top:0;left:0;width:26px;height:26px;
  border-top:2px solid var(--vermilion);
  border-left:2px solid var(--vermilion);
  border-radius:var(--radius) 0 0 0;
  opacity:0;transition:opacity .3s ease;
}
.card:hover .corner{opacity:.7}
/* 红条从底部滑出 */
.card::before{
  content:"";position:absolute;left:0;bottom:0;width:4px;height:0;
  background:linear-gradient(var(--vermilion),var(--vermilion-d));
  transition:height .24s ease;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(168,58,44,.38)}
.card:hover::before{height:100%}

/* 水墨扩散 hover 层 */
.card{ --mx:50%; --my:50%; isolation:isolate; }
.card::after{
  content:""; position:absolute; inset:0; z-index:-1;
  background:
    radial-gradient(circle at var(--mx) var(--my),
      rgba(42,38,32,.20) 0%,
      rgba(168,58,44,.13) 20%,
      rgba(58,86,72,.09) 42%,
      transparent 62%);
  opacity:0; transform:scale(.35);
  transition:opacity .5s ease, transform .6s cubic-bezier(.2,.8,.2,1);
  pointer-events:none; mix-blend-mode:multiply;
  filter:blur(1.5px);
}
.card:hover::after{opacity:1; transform:scale(1.12)}
.card.ghost::after{display:none}
@media (prefers-reduced-motion: reduce){ .card::after{transition:none} }

.card .ic{
  width:48px;height:48px;border-radius:13px;
  display:flex;align-items:center;justify-content:center;
  font-size:24px;margin-bottom:12px;
  position:relative;
  transition:transform .3s ease;
}
.card:hover .ic{transform:scale(1.08) rotate(-3deg)}
.card .ic svg{width:26px;height:26px}
.ic.c-zhiye{background:linear-gradient(145deg,rgba(168,58,44,.14),rgba(168,58,44,.06))}
.ic.c-fang{background:linear-gradient(145deg,rgba(58,86,72,.16),rgba(58,86,72,.06))}
.ic.c-yang{background:linear-gradient(145deg,rgba(150,101,46,.16),rgba(150,101,46,.06))}
.ic.c-wen{background:linear-gradient(145deg,rgba(69,105,122,.16),rgba(69,105,122,.06))}
.ic.c-demo{background:linear-gradient(145deg,rgba(90,122,104,.18),rgba(90,122,104,.06))}
.card .name{font-size:17px;font-weight:700;color:var(--ink);letter-spacing:.5px}
.card.hot .name{font-size:19px}
.card .desc{
  font-size:12.5px;color:var(--ink-soft);margin-top:6px;flex:1;line-height:1.75;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
}
.card .divider{height:1px;background:linear-gradient(90deg,var(--line),transparent);margin:12px 0 10px}
.card .meta{
  font-size:11.5px;color:var(--vermilion-d);
  font-weight:600;letter-spacing:.3px;
}
.card .go{
  margin-top:8px;font-size:12.5px;color:var(--moss);font-weight:700;
  display:inline-flex;align-items:center;gap:4px;
  transition:gap .2s ease;
}
.card:hover .go{gap:8px}
.card.hot{
  background:linear-gradient(180deg,#fffdf7,#fbf3e2);
  border-color:rgba(168,58,44,.26);
}
.card.hot .meta{color:var(--gold)}
.card .badge{
  position:absolute;top:14px;right:14px;
  background:linear-gradient(145deg,var(--vermilion),var(--vermilion-d));
  color:#fff;
  font-size:11px;padding:2px 10px;border-radius:11px;font-weight:700;
  box-shadow:0 3px 10px rgba(168,58,44,.32);
  z-index:2;
}

/* 占位卡 */
.card.ghost{
  border:1.5px dashed var(--line);
  background:transparent;box-shadow:none;
  align-items:center;justify-content:center;text-align:center;
  color:var(--ink-soft);cursor:default;
}
.card.ghost:hover{transform:none;box-shadow:none;border-color:var(--line)}
.card.ghost:hover::before{height:0}
.card.ghost .plus{font-size:30px;line-height:1;color:var(--moss-soft)}
.card.ghost .t{margin-top:8px;font-size:14px;font-weight:600}

/* 入场依次淡入 */
@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}
.grid.hot .card:nth-child(1){animation-delay:.05s}
.grid.hot .card:nth-child(2){animation-delay:.10s}
.grid.hot .card:nth-child(3){animation-delay:.15s}
.grid.hot .card:nth-child(4){animation-delay:.20s}
.grid.tools .card:nth-child(1){animation-delay:.06s}
.grid.tools .card:nth-child(2){animation-delay:.11s}
.grid.tools .card:nth-child(3){animation-delay:.16s}
.grid.tools .card:nth-child(4){animation-delay:.21s}
.grid.tools .card:nth-child(5){animation-delay:.26s}
.grid.tools .card:nth-child(6){animation-delay:.31s}
.grid.tools .card:nth-child(7){animation-delay:.36s}
.grid.tools .card:nth-child(8){animation-delay:.41s}

/* ===== 滚动入场动画 ===== */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease, transform .7s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* ===== 底部 ===== */
.foot{
  text-align:center;font-size:11.5px;color:var(--ink-soft);
  margin-top:48px;line-height:1.9;padding:0 16px;
}
.foot a{color:var(--ink-soft);text-decoration:none;border-bottom:1px dotted var(--line)}
.foot a:hover{color:var(--vermilion)}

@media(max-width:900px){
  .grid.hot,.grid.tools{grid-template-columns:repeat(2,1fr)}
  .brand{font-size:34px}
  body{background-attachment:scroll;background-size:cover}
}
@media(max-width:560px){
  .grid.hot,.grid.tools{grid-template-columns:1fr;gap:12px}
  .hero{padding-top:40px}
  .tagline{font-size:14px}
  .brand{font-size:28px;letter-spacing:2px}
}

/* ===== 全站统一顶栏 / 页脚（产品感外壳） ===== */
.site-nav{
  position:sticky;top:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:11px 24px;
  background:rgba(242,233,213,.9);
  backdrop-filter:saturate(150%) blur(10px);
  -webkit-backdrop-filter:saturate(150%) blur(10px);
  border-bottom:1px solid var(--line);
  font-size:14px;
  box-shadow:0 1px 0 rgba(255,255,255,.4) inset;
}
.site-nav .sn-brand{
  font-weight:900;letter-spacing:2px;color:var(--ink);text-decoration:none;
  font-size:18px;white-space:nowrap;
  display:flex;align-items:center;gap:8px;
}
.site-nav .sn-brand .sn-seal{
  width:26px;height:26px;border-radius:6px;
  background:linear-gradient(145deg,var(--vermilion),var(--vermilion-d));
  color:#fff;font-size:14px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 2px 6px rgba(168,58,44,.3);
  transform:rotate(-4deg);
}
.site-nav .sn-brand span{color:var(--vermilion)}
.site-nav .sn-links{display:flex;gap:20px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.site-nav .sn-links a{
  color:var(--ink-soft);text-decoration:none;transition:.2s;
  position:relative;padding:2px 0;
}
.site-nav .sn-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;
  background:var(--vermilion);border-radius:2px;transition:width .25s ease;
}
.site-nav .sn-links a:hover{color:var(--vermilion)}
.site-nav .sn-links a:hover::after{width:100%}
.site-nav .sn-gzh{
  background:linear-gradient(145deg,var(--vermilion),var(--vermilion-d));
  color:#fff!important;padding:7px 16px;border-radius:999px;font-weight:600;
  box-shadow:0 4px 14px rgba(168,58,44,.28);
  transition:transform .2s ease, box-shadow .2s ease;
}
.site-nav .sn-gzh::after{display:none}
.site-nav .sn-gzh:hover{background:var(--vermilion-d);color:#fff!important;transform:translateY(-1px);box-shadow:0 6px 18px rgba(168,58,44,.36)}
@media(max-width:560px){
  .site-nav{padding:9px 14px;gap:8px}
  .site-nav .sn-links{gap:14px;font-size:13px}
  .site-nav .sn-brand{font-size:16px}
  .site-nav .sn-brand .sn-seal{width:22px;height:22px;font-size:12px}
}
.site-foot{
  margin-top:50px;border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(249,243,228,.4),rgba(242,233,213,.7));
  padding:30px 18px;
  position:relative;
}
.site-foot::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,transparent,var(--vermilion),var(--gold),var(--moss),transparent);
  opacity:.35;
}
.site-foot .sf-inner{max-width:900px;margin:0 auto;display:flex;gap:24px;align-items:center;flex-wrap:wrap;justify-content:center;text-align:left}
.site-foot .sf-qr img{width:96px;height:96px;border:4px solid #fff;border-radius:10px;box-shadow:0 6px 18px rgba(0,0,0,.14)}
.site-foot .sf-qr{display:flex;flex-direction:column;align-items:center;gap:6px}
.site-foot .sf-qr-label{font-size:11px;color:var(--ink-soft);letter-spacing:1px}
.site-foot .sf-txt{flex:1;min-width:240px}
.site-foot .sf-claim{font-size:12.5px;color:var(--ink-soft);line-height:1.85}
.site-foot .sf-meta{margin-top:10px;font-size:12px;color:var(--ink-soft);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.site-foot .sf-meta a{color:var(--vermilion-d);text-decoration:none}
.site-foot .sf-meta a:hover{text-decoration:underline}
@media(max-width:560px){.site-foot .sf-inner{flex-direction:column;text-align:center}.site-foot .sf-txt{text-align:center}}