/* ============================================================
   「爬一会儿」官网原型 · 共享样式表
   移动端优先 / 自然生态品牌语言 / 无外部依赖
   ============================================================ */

:root{
  /* 品牌色 */
  --green-deep:#123326;      /* 主色：深林绿 */
  --green:#24503a;           /* 次深色 */
  --green-mid:#3a6b4d;       /* 品牌绿 */
  --moss:#7ba57f;            /* 苔藓点缀 */
  --amber:#c98a2c;           /* 温度色：标本/手作 */
  --amber-soft:#e8c88a;
  --cream:#f5f2ea;           /* 纸色底 */
  --paper:#fffdf8;
  --ink:#1d1c19;
  --ink-2:#5a574e;
  --ink-3:#8f8b7e;

  /* 排版 */
  --font-cn:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Noto Sans SC",-apple-system,"Segoe UI",sans-serif;
  --font-display:"Songti SC","STSong","Noto Serif SC",serif;

  /* 尺度 */
  --radius:14px;
  --shadow-sm:0 2px 10px rgba(18,51,38,.06);
  --shadow-md:0 10px 30px rgba(18,51,38,.12);
  --shadow-lg:0 18px 50px rgba(10,30,22,.28);
  --wrap:1120px;
  --gap:clamp(16px,4vw,32px);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-cn);
  color:var(--ink);
  background:var(--cream);
  font-size:15px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(18px,5vw,32px)}
.eyebrow{
  font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--moss);font-weight:600;
}
.serif{font-family:var(--font-display)}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px clamp(18px,5vw,32px);
  transition:background .35s ease, box-shadow .35s ease, padding .35s ease;
}
.nav.solid,.body-scrolled .nav{
  background:rgba(245,242,234,.92);
  backdrop-filter:saturate(150%) blur(12px);
  box-shadow:0 1px 0 rgba(18,51,38,.08);
  padding:10px clamp(18px,5vw,32px);
}
.brandmark{display:flex;align-items:center;gap:10px}
.brandmark .mark{
  width:34px;height:34px;flex:none;
  display:block;object-fit:contain;object-position:center center;
  background:transparent;border-radius:0;padding:0;box-shadow:none;
  filter:drop-shadow(0 1px 2px rgba(0,0,0,.28));
}
/* 品牌字标（浅底印章样式，供深色背景使用） */
.logo-stamp{
  display:inline-block;background:var(--cream);border-radius:12px;
  padding:8px 14px;box-shadow:0 8px 24px rgba(0,0,0,.22);
}
.logo-stamp img{height:clamp(38px,8vw,52px);width:auto}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-size:16.5px;letter-spacing:.06em;font-weight:700}
.brand-text span{font-size:9.5px;letter-spacing:.32em;color:var(--ink-3)}
.nav.light:not(.solid):not(.over-content) .brand-text b,
.nav.on-hero:not(.solid) .brand-text b{color:#fff}
.nav.on-hero:not(.solid) .brand-text span{color:rgba(255,255,255,.6)}
.nav.on-hero:not(.solid) .navlinks a{color:rgba(255,255,255,.82)}
.navlinks{display:flex;gap:4px;align-items:center}
.navlinks a{
  font-size:14px;padding:7px 13px;border-radius:999px;color:var(--ink-2);
  transition:background .25s,color .25s;
}
.navlinks a:hover{background:rgba(36,80,58,.08);color:var(--green)}
.navlinks a.active{color:var(--green);font-weight:600}
.nav.on-hero:not(.solid) .navlinks a:hover{background:rgba(255,255,255,.14);color:#fff}
.navtoggle{display:none;color:inherit}
@media (max-width:720px){
  .navlinks{gap:0}
  .navlinks a{font-size:13px;padding:6px 9px}
  .brand-text span{display:none}
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:center;
  overflow:hidden;isolation:isolate;
}
.hero-media{position:absolute;inset:0;z-index:-2}
.hero-media img{width:100%;height:100%;object-fit:cover;transform:scale(1.04);animation:slowzoom 24s ease-out forwards}
@keyframes slowzoom{to{transform:scale(1.12)}}
.hero-media::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(105deg,rgba(12,32,23,.94) 0%,rgba(12,32,23,.72) 42%,rgba(12,32,23,.28) 100%),
    linear-gradient(to top,rgba(12,32,23,.7),rgba(12,32,23,0) 45%);
}
.hero-inner{padding:118px 0 78px;max-width:760px}
@media (max-width:860px){
  .hero-inner{padding:118px clamp(18px,5vw,32px) 78px}
}
.hero .eyebrow{color:var(--amber-soft);display:flex;align-items:center;gap:10px}
.hero .eyebrow::before{content:"";width:26px;height:1px;background:var(--amber-soft)}
.hero h1{
  font-family:var(--font-display);
  font-size:clamp(46px,11vw,96px);line-height:1.02;letter-spacing:.04em;
  color:#fff;margin:16px 0 0;font-weight:700;
}
.hero h1 em{
  display:block;font-style:normal;font-size:clamp(11px,2.4vw,14px);
  letter-spacing:.5em;color:rgba(255,255,255,.5);margin-top:14px;font-family:var(--font-cn);font-weight:400;
}
.hero .claim{
  color:#f0efe6;font-size:clamp(16px,3.4vw,21px);margin-top:22px;
  font-weight:500;letter-spacing:.02em;line-height:1.6;
}
.hero .claim b{color:var(--amber-soft);font-weight:600}
.hero .desc{color:rgba(255,255,255,.72);font-size:clamp(13.5px,2.8vw,15.5px);margin-top:14px;max-width:34em;line-height:1.85}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}
.btn{
  display:inline-flex;align-items:center;gap:9px;
  padding:13px 26px;border-radius:999px;font-size:14.5px;font-weight:600;letter-spacing:.03em;
  transition:transform .2s ease, box-shadow .25s ease, background .25s, color .25s;
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--amber);color:#2a1c07;box-shadow:0 8px 24px rgba(201,138,44,.32)}
.btn-primary:hover{box-shadow:0 12px 30px rgba(201,138,44,.42)}
.btn-ghost{border:1px solid rgba(255,255,255,.34);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.6)}
.hero-meta{
  display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:38px;padding-top:22px;
  border-top:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.66);font-size:13px;
}
.hero-meta span{display:inline-flex;align-items:center;gap:7px}
.hero-meta i{
  width:6px;height:6px;border-radius:50%;background:var(--amber);flex:none;
  box-shadow:0 0 0 4px rgba(201,138,44,.18);
}
.scrollcue{
  position:absolute;left:50%;bottom:22px;transform:translateX(-50%);
  color:rgba(255,255,255,.55);font-size:11px;letter-spacing:.24em;
  display:flex;flex-direction:column;align-items:center;gap:8px;
}
.scrollcue::after{
  content:"";width:1px;height:34px;
  background:linear-gradient(rgba(255,255,255,.5),transparent);
  animation:cue 2.2s ease-in-out infinite;
}
@keyframes cue{0%,100%{opacity:.3;transform:scaleY(.4)}50%{opacity:1;transform:scaleY(1)}}

/* ---------- 通用区块 ---------- */
.section{padding:clamp(56px,9vw,96px) 0}
.section-head{max-width:760px;margin-bottom:clamp(28px,5vw,46px)}
.section-head h2{
  font-family:var(--font-display);font-size:clamp(26px,5.4vw,42px);
  line-height:1.25;color:var(--green-deep);font-weight:700;margin-top:12px;
}
.section-head p{color:var(--ink-2);margin-top:14px;font-size:clamp(14.5px,2.6vw,16.5px)}
.lead{font-size:clamp(16px,3vw,19px);color:var(--ink);line-height:1.9}

.split-2{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,5vw,56px);align-items:center}
@media (max-width:860px){.split-2{grid-template-columns:1fr}}
.figure{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md)}
.figure img{width:100%}
.figure figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:9px 14px;
  background:linear-gradient(transparent,rgba(12,32,23,.72));color:rgba(255,255,255,.82);font-size:11.5px;letter-spacing:.04em;
}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:var(--gap)}
.card{background:var(--paper);border:1px solid #e8e3d6;border-radius:var(--radius);padding:26px 24px;box-shadow:var(--shadow-sm);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.card .num{font-family:var(--font-display);font-size:13px;color:var(--amber);letter-spacing:.2em;font-weight:700}
.card h3{font-size:17.5px;margin:8px 0 10px;color:var(--green-deep);font-weight:700}
.card p{font-size:14px;color:var(--ink-2);line-height:1.8}

.lines{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px;margin-top:26px}
.line-item{
  border-left:3px solid var(--moss);padding:12px 0 12px 16px;
  background:linear-gradient(90deg,rgba(123,165,127,.09),transparent 70%);
}
.line-item b{display:block;font-size:15px;color:var(--green-deep)}
.line-item span{font-size:12.5px;color:var(--ink-3)}

.note-box{
  border:1px dashed #cfc7b3;background:rgba(201,138,44,.06);border-radius:var(--radius);
  padding:18px 20px;font-size:13px;color:var(--ink-2);display:flex;gap:12px;align-items:flex-start;
}
.note-box .ic{color:var(--amber);font-size:15px;flex:none;line-height:1.5}

/* ---------- 页脚 ---------- */
.foot{background:var(--green-deep);color:rgba(255,255,255,.62);padding:44px 0 30px;font-size:13px}
.foot-grid{display:flex;flex-wrap:wrap;gap:26px;justify-content:space-between;align-items:flex-start}
.foot h4{color:#fff;font-size:14.5px;margin-bottom:8px;font-weight:600}
.foot .fine{margin-top:26px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;line-height:1.9}
.foot a:hover{color:var(--amber-soft)}

/* ---------- 私域入口 ---------- */
.pd-float{
  position:fixed;right:clamp(14px,3vw,26px);bottom:clamp(14px,3vw,26px);z-index:80;
  display:flex;flex-direction:column;align-items:flex-end;gap:10px;
}
.pd-btn{
  position:relative;
  width:56px;height:56px;border-radius:50%;
  background:linear-gradient(150deg,var(--green-mid),var(--green-deep));
  color:#fff;display:grid;place-items:center;box-shadow:var(--shadow-lg);
  transition:transform .25s;
}
.pd-btn:hover{transform:translateY(-3px) scale(1.03)}
.pd-btn .txt{position:absolute;right:64px;white-space:nowrap;background:var(--green-deep);color:#fff;font-size:12px;padding:5px 11px;border-radius:999px;box-shadow:var(--shadow-md);opacity:0;transition:opacity .25s;pointer-events:none}
.pd-btn .txt.show{opacity:1}
.pd-btn.pulse::after{
  content:"";position:absolute;inset:0;border-radius:50%;
  box-shadow:0 0 0 0 rgba(58,107,77,.5);animation:pulse 2.8s infinite;
}
@keyframes pulse{70%{box-shadow:0 0 0 16px rgba(58,107,77,0)}100%{box-shadow:0 0 0 0 rgba(58,107,77,0)}}
.pd-panel{
  width:min(300px,calc(100vw - 32px));background:var(--paper);border-radius:18px;
  box-shadow:var(--shadow-lg);overflow:hidden;
  transform-origin:bottom right;transition:transform .28s ease,opacity .22s ease;
  border:1px solid #e8e3d6;
}
.pd-panel[hidden]{display:block;transform:scale(.86) translateY(10px);opacity:0;pointer-events:none}
.pd-top{background:linear-gradient(140deg,var(--green),var(--green-deep));color:#fff;padding:16px 18px}
.pd-top b{font-size:15px;display:block}
.pd-top span{font-size:12px;color:rgba(255,255,255,.66)}
.pd-body{padding:16px 18px 18px}
.pd-qr{
  width:100%;aspect-ratio:1;border-radius:12px;overflow:hidden;
  background:#fff;border:1px solid #e6e0d0;display:grid;place-items:center;
}
.pd-qr img{width:100%;height:100%;object-fit:contain}
.pd-body p{font-size:12.5px;color:var(--ink-2);margin-top:12px;line-height:1.8}
.pd-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{font-size:12px;padding:5px 12px;border-radius:999px;background:rgba(58,107,77,.09);color:var(--green);border:1px solid rgba(58,107,77,.18)}
.pd-actions{display:flex;gap:8px;margin-top:14px}
.pd-actions a{
  flex:1;text-align:center;font-size:13px;padding:10px;border-radius:10px;
  background:var(--green);color:#fff;font-weight:600;
}
.pd-actions a.ghost{background:rgba(58,107,77,.1);color:var(--green)}
.pd-foot-note{font-size:11.5px;color:var(--ink-3);margin-top:10px;text-align:center}

@media (max-width:520px){
  .pd-btn{width:50px;height:50px}
  .hero-actions .btn{flex:1;justify-content:center}
  .btn{white-space:nowrap;padding:11px 18px;font-size:13.5px}
  .pd-btn .txt{right:0;left:auto;bottom:60px;top:auto;white-space:nowrap}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
}