/* ==========================================================================
   固城湖大闸蟹 · 高淳 — 样式表
   字体：思源宋体 / 马善政 / 霞鹜文楷（均 SIL OFL，免费商用）
   ========================================================================== */

:root{
  color-scheme:light;
  --bg:#faf9f5;
  --bg-2:#f2efe7;
  --ink:#211d16;
  --ink-soft:#5c5647;
  --muted:#6f695c;
  --line:rgba(33,29,22,.14);
  --red:#9c3a26;
  --row-hover:rgba(33,29,22,.04);
  --nav-solid:rgba(250,249,245,.9);
  --finale-bg:#16120d;
  --finale-line:rgba(246,242,232,.16);
}
[data-theme="dark"]{
  color-scheme:dark;
  --bg:#16130f;
  --bg-2:#1d1812;
  --ink:#ece7d9;
  --ink-soft:#b3aa97;
  --muted:#8a8371;
  --line:rgba(236,231,217,.15);
  --red:#cd6248;
  --row-hover:rgba(236,231,217,.05);
  --nav-solid:rgba(22,19,15,.9);
  --finale-bg:#0f0c08;
  --finale-line:rgba(246,242,232,.16);
}
:root{
  --cream:#f3ecdc;
  --serif:"Noto Serif SC","Source Han Serif SC","STSong","SimSun",serif;
  --cali:"Ma Shan Zheng","Noto Serif SC","KaiTi","STKaiti",serif;
  --kai:"LXGW WenKai","KaiTi","STKaiti","Noto Serif SC",serif;
}
*{margin:0;padding:0;box-sizing:border-box}
body{
  font-family:var(--serif);
  background:var(--bg);
  color:var(--ink);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  transition:background-color .5s ease,color .5s ease;
}
::selection{background:var(--red);color:var(--cream)}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
:focus-visible{outline:2px solid var(--red);outline-offset:3px;border-radius:2px}
section[id],header[id]{scroll-margin-top:76px}

.wrap{max-width:1220px;margin:0 auto;padding:0 clamp(22px,5vw,64px)}

/* 小节标号 */
.label{display:flex;align-items:baseline;gap:14px;font-size:13px;letter-spacing:.34em;color:var(--muted)}
.label .no{font-size:13px;color:var(--red);letter-spacing:.2em}
.label::after{content:"";flex:1;height:1px;background:var(--line)}
@media(max-width:520px){.label{letter-spacing:.2em}}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:20px clamp(22px,5vw,64px);
  color:var(--cream);
  transition:background .45s ease,color .45s ease,padding .45s ease,border-color .45s ease;
  border-bottom:1px solid transparent;
}
.nav.solid{
  background:var(--nav-solid);backdrop-filter:blur(14px);
  color:var(--ink);padding:14px clamp(22px,5vw,64px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:11px;font-size:17px;letter-spacing:.3em;font-weight:700}
.brand .seal{
  width:32px;height:32px;background:var(--red);color:var(--cream);border-radius:6px;
  display:grid;place-items:center;font-size:18px;font-weight:900;letter-spacing:0;
  transform:rotate(-4deg);transition:transform .35s ease;
}
.brand:hover .seal{transform:rotate(0)}
.nav-right{display:flex;align-items:center;gap:clamp(14px,2vw,28px)}
.nav-links{display:flex;gap:clamp(18px,2.6vw,40px);font-size:13.5px;letter-spacing:.24em;opacity:.85}
.nav-links a{position:relative;padding:6px 2px}
.nav-links a::after{content:"";position:absolute;left:2px;right:2px;bottom:0;height:1px;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform .35s}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-cta{
  font-size:12.5px;letter-spacing:.26em;text-indent:.26em;
  border:1px solid currentColor;padding:12px 22px;border-radius:2px;opacity:.9;
  transition:background .35s,color .35s;
}
.nav:not(.solid) .nav-cta:hover{background:var(--cream);color:#211d16}
.nav.solid .nav-cta:hover{background:var(--ink);color:var(--bg)}
.theme-btn{
  width:44px;height:44px;border-radius:50%;border:1px solid currentColor;
  background:transparent;color:inherit;cursor:pointer;opacity:.85;
  display:grid;place-items:center;transition:opacity .3s,transform .3s;
}
.theme-btn:hover{opacity:1;transform:rotate(15deg)}
.theme-btn svg{width:17px;height:17px}
.theme-btn .moon{display:none}
[data-theme="dark"] .theme-btn .sun{display:none}
[data-theme="dark"] .theme-btn .moon{display:block}
@media(max-width:860px){.nav-links{display:none}}

/* ---------- 首屏（摄影大图，昼夜一致） ---------- */
.hero{position:relative;height:100vh;height:100svh;min-height:620px;color:var(--cream);overflow:hidden}
.hero img.bg{
  position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 38%;
  filter:brightness(.84) saturate(1.05);
}
.hero::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(22,18,13,.5) 0%,rgba(22,18,13,0) 26%),
    linear-gradient(102deg,rgba(22,18,13,.62) 0%,rgba(22,18,13,.28) 42%,rgba(22,18,13,0) 62%),
    linear-gradient(180deg,rgba(22,18,13,0) 45%,rgba(22,18,13,.72) 100%);
}
.hero-inner{position:absolute;z-index:2;left:clamp(22px,5vw,64px);right:clamp(22px,5vw,64px);bottom:clamp(88px,14vh,140px)}
.hero-eyebrow{font-size:13px;letter-spacing:.5em;color:rgba(243,236,220,.85)}
.hero h1{margin-top:22px;font-size:clamp(38px,6vw,76px);font-weight:900;letter-spacing:.1em;line-height:1.4;color:#f7f1e3}
.hero-sub{margin-top:20px;font-family:var(--kai);font-size:17px;letter-spacing:.22em;color:rgba(243,236,220,.88)}
.hero-cta{
  display:inline-block;margin-top:38px;
  font-size:13.5px;letter-spacing:.34em;text-indent:.34em;
  border:1px solid rgba(243,236,220,.75);padding:15px 34px;border-radius:2px;
  transition:background .4s,color .4s;
}
.hero-cta:hover{background:var(--cream);color:#211d16}
.hero-foot{
  position:absolute;z-index:2;left:clamp(22px,5vw,64px);right:clamp(22px,5vw,64px);bottom:34px;
  display:flex;justify-content:space-between;align-items:center;
  font-size:12px;letter-spacing:.26em;color:rgba(243,236,220,.6);
  border-top:1px solid rgba(243,236,220,.2);padding-top:20px;
}
.hero-foot .scr{display:flex;align-items:center;gap:14px}
.hero-foot .scr::after{
  content:"";width:1px;height:34px;background:linear-gradient(180deg,rgba(243,236,220,.8),transparent);
}
@media(max-width:760px){.hero-foot .season{display:none}}

/* ---------- 章节公共 ---------- */
section.block{padding:clamp(84px,11vw,140px) 0}
.block-head{display:grid;grid-template-columns:220px 1fr;gap:clamp(24px,4vw,60px);align-items:start}
.block-head .label{padding-top:10px}
.block-head h2{font-size:clamp(28px,3.6vw,44px);font-weight:900;letter-spacing:.1em;line-height:1.4}
.block-head .lead{
  margin-top:22px;font-family:var(--kai);font-size:clamp(16px,1.5vw,19px);
  line-height:2.15;letter-spacing:.04em;color:var(--ink-soft);max-width:56ch;
}
@media(max-width:860px){.block-head{grid-template-columns:1fr}}

/* ---------- 溯源 ---------- */
.origin-body{
  margin-top:clamp(48px,6vw,80px);
  display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(36px,5vw,80px);align-items:start;
}
.origin-text p{font-size:15.5px;line-height:2.3;letter-spacing:.06em;color:var(--ink-soft);text-align:justify}
.origin-text p + p{margin-top:22px}
.origin-text p.lede::first-letter{
  font-family:var(--cali);font-size:2.9em;float:left;line-height:.92;margin:6px 14px 0 0;color:var(--red);
}
.honors{
  margin-top:38px;padding-top:22px;border-top:1px solid var(--line);
  font-size:12.5px;letter-spacing:.2em;color:var(--muted);line-height:2;
  transition:border-color .5s ease;
}
.origin-visual .ph{overflow:hidden}
.origin-visual img{width:100%;aspect-ratio:4/4.6;object-fit:cover}
.origin-visual figcaption{
  display:flex;justify-content:space-between;gap:16px;margin-top:14px;
  font-size:12px;letter-spacing:.2em;color:var(--muted);
}
.water-list{margin-top:26px;border-top:1px solid var(--line);transition:border-color .5s ease}
.water-list .row{
  display:flex;justify-content:space-between;gap:16px;
  padding:13px 0;border-bottom:1px solid var(--line);
  font-size:13.5px;letter-spacing:.12em;transition:border-color .5s ease;
}
.water-list .row em{font-style:normal;color:var(--muted)}
.water-list .row strong{font-weight:600}
@media(max-width:900px){.origin-body{grid-template-columns:1fr}}

/* ---------- 四绝 ---------- */
.quad-sec{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);transition:background-color .5s ease,border-color .5s ease}
.quad-body{
  margin-top:clamp(48px,6vw,80px);
  display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(36px,5vw,72px);align-items:stretch;
}
.quad-photo{position:relative;overflow:hidden;min-height:400px}
.quad-photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.quad-photo figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:20px 24px;
  background:linear-gradient(0deg,rgba(22,18,13,.82),transparent);
  color:rgba(243,236,220,.9);font-size:12.5px;letter-spacing:.26em;
}
.marks{display:grid;grid-template-columns:1fr 1fr;align-content:stretch}
.mark{padding:clamp(26px,3vw,44px) clamp(20px,2.4vw,36px);border-top:1px solid var(--line);transition:border-color .5s ease}
.mark:nth-child(even){border-left:1px solid var(--line)}
.mark .glyph{font-size:clamp(36px,3.6vw,52px);font-weight:900;letter-spacing:.06em}
.mark h4{margin-top:16px;font-size:13px;letter-spacing:.32em;color:var(--red);font-weight:700}
.mark p{margin-top:12px;font-size:13px;line-height:2.05;letter-spacing:.04em;color:var(--ink-soft)}
@media(max-width:900px){
  .quad-body{grid-template-columns:1fr}
  .quad-photo{min-height:0}
  .quad-photo img{position:static;width:100%;height:auto}
}
@media(max-width:520px){.marks{grid-template-columns:1fr}.mark:nth-child(even){border-left:none}}

/* ---------- 蟹黄横幅（摄影，昼夜一致） ---------- */
.roe-band{
  position:relative;min-height:68vh;display:grid;place-items:center;
  background:url("../assets/roe-hand.jpg") center 40%/cover no-repeat fixed;
}
.roe-band::after{content:"";position:absolute;inset:0;background:rgba(22,18,13,.42)}
.roe-band .cali{
  position:relative;z-index:1;
  font-family:var(--cali);font-size:clamp(44px,7.4vw,100px);letter-spacing:.14em;
  color:#f7f1e3;text-shadow:0 6px 44px rgba(0,0,0,.55);
}
@media (hover:none), (max-width:900px){.roe-band{background-attachment:scroll}}
@media (max-width:520px){.roe-band .cali{font-size:34px;letter-spacing:.1em}}

/* ---------- 蟹单 ---------- */
.menu-note{margin-top:18px;font-size:13px;letter-spacing:.2em;color:var(--muted)}
.menu{margin-top:clamp(48px,6vw,80px);border-top:1px solid var(--ink);transition:border-color .5s ease}
.menu-row{
  display:grid;grid-template-columns:1.2fr 1.5fr .6fr .5fr;gap:clamp(16px,3vw,48px);
  align-items:baseline;padding:clamp(26px,3.4vw,40px) clamp(8px,1vw,16px);
  border-bottom:1px solid var(--line);
  transition:background .35s,border-color .5s ease;
  position:relative;
}
.menu-row:hover{background:var(--row-hover)}
.menu-row .m-name{font-size:clamp(19px,1.8vw,24px);font-weight:900;letter-spacing:.14em}
.menu-row .m-name small{display:block;margin-top:8px;font-size:12px;font-weight:400;letter-spacing:.3em;color:var(--muted)}
.menu-row .m-spec{font-size:14px;letter-spacing:.08em;line-height:2;color:var(--ink-soft)}
.menu-row .m-price{font-size:clamp(20px,1.9vw,26px);font-weight:900;font-variant-numeric:tabular-nums;letter-spacing:.04em}
.menu-row .m-price::before{content:"¥";font-size:.55em;margin-right:4px;color:var(--muted);font-weight:400}
.menu-row .m-price.custom{font-size:clamp(17px,1.6vw,22px);letter-spacing:.2em}
.menu-row .m-price.custom::before{content:"";margin:0}
.menu-row .m-go{
  font-size:13px;letter-spacing:.24em;white-space:nowrap;
  border-bottom:1px solid var(--ink);padding:8px 2px 7px;justify-self:end;
  transition:color .3s,border-color .3s;
}
.menu-row .m-go:hover{color:var(--red);border-color:var(--red)}
.menu-row .m-tag{position:absolute;top:-1px;right:0;transform:translateY(-100%);font-size:11px;letter-spacing:.3em;color:var(--red)}
.menu-fine{margin-top:26px;font-size:12.5px;letter-spacing:.16em;color:var(--muted);line-height:2.1}
@media(max-width:820px){
  .menu-row{
    grid-template-columns:1fr auto;row-gap:14px;
    grid-template-areas:"name price" "spec spec" "go go";
  }
  .menu-row .m-name{grid-area:name}
  .menu-row .m-price{grid-area:price;justify-self:end;align-self:start}
  .menu-row .m-spec{grid-area:spec}
  .menu-row .m-go{
    grid-area:go;justify-self:stretch;text-align:center;
    border:1px solid var(--ink);border-radius:2px;padding:14px;margin-top:6px;
  }
}

/* ---------- 呈鲜 ---------- */
.flow-list{
  margin-top:clamp(48px,6vw,80px);
  display:grid;grid-template-columns:repeat(5,1fr);gap:clamp(18px,2.4vw,32px);
  border-top:1px solid var(--line);transition:border-color .5s ease;
}
.f-step{padding-top:24px;border-top:2px solid var(--ink);margin-top:-1px;transition:border-color .5s ease}
.f-step .no{font-size:12px;letter-spacing:.26em;color:var(--red)}
.f-step h4{margin-top:14px;font-size:16px;letter-spacing:.22em;font-weight:700}
.f-step p{margin-top:10px;font-size:12.5px;line-height:2;letter-spacing:.04em;color:var(--ink-soft)}
.flow-photos{margin-top:clamp(48px,6vw,72px);display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,26px)}
.flow-photos figure{overflow:hidden}
.flow-photos img{width:100%;aspect-ratio:4/3.4;object-fit:cover;transition:transform .9s ease}
.flow-photos figure:hover img{transform:scale(1.05)}
.flow-photos figcaption{
  display:flex;justify-content:space-between;
  padding-top:13px;font-size:12px;letter-spacing:.22em;color:var(--muted);
}
@media(max-width:900px){.flow-list{grid-template-columns:repeat(2,1fr);row-gap:36px}}
@media(max-width:600px){.flow-list{grid-template-columns:1fr}.flow-photos{grid-template-columns:1fr}}

/* ---------- 收尾（昼夜均为深色） ---------- */
.finale{background:var(--finale-bg);color:var(--cream);text-align:center;padding:clamp(110px,15vw,180px) 22px;transition:background-color .5s ease}
.finale .eyebrow{font-size:12.5px;letter-spacing:.5em;text-indent:.5em;color:rgba(243,236,220,.55)}
.finale .cali{
  margin-top:34px;font-family:var(--cali);
  font-size:clamp(38px,6vw,76px);letter-spacing:.14em;line-height:1.6;color:#f3ecdc;
}
.finale .phone{margin-top:44px;font-size:clamp(24px,3vw,36px);font-weight:900;letter-spacing:.12em}
.finale .phone small{display:block;font-size:12px;font-weight:400;letter-spacing:.34em;color:rgba(243,236,220,.5);margin-bottom:12px}
.finale .phone a{transition:opacity .3s}
.finale .phone a:hover{opacity:.72}
.finale .phone .slash{color:rgba(243,236,220,.4);font-weight:400}
@media(max-width:480px){
  .finale .phone a{display:block}
  .finale .phone a + .slash{display:none}
  .finale .phone a + .slash + a{margin-top:10px}
}
.finale .f-cta{
  display:inline-block;margin-top:44px;
  font-size:13px;letter-spacing:.34em;text-indent:.34em;
  border:1px solid rgba(243,236,220,.6);padding:15px 36px;border-radius:2px;
  transition:background .4s,color .4s;
}
.finale .f-cta:hover{background:var(--cream);color:#211d16}
footer{
  background:var(--finale-bg);color:rgba(243,236,220,.45);
  border-top:1px solid var(--finale-line);
  padding:30px clamp(22px,5vw,64px);
  display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-size:12px;letter-spacing:.14em;line-height:2;
  transition:background-color .5s ease;
}
footer a{transition:color .3s}
footer a:hover{color:rgba(243,236,220,.8)}
footer .f-note{
  flex-basis:100%;margin-top:16px;padding-top:16px;
  border-top:1px solid var(--finale-line);
  font-size:12px;letter-spacing:.12em;color:rgba(243,236,220,.35);line-height:2;
}
@media(max-width:760px){footer{justify-content:center;text-align:center}}

/* ---------- 动效（含 reduced-motion 回退） ---------- */
@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth}
  .hero img.bg{transform:scale(1.06);animation:heroZoom 9s ease-out forwards}
  @keyframes heroZoom{to{transform:scale(1)}}
  .hero-foot .scr::after{animation:drip 2.4s ease-in-out infinite}
  @keyframes drip{0%{transform:scaleY(0);transform-origin:top}55%{transform:scaleY(1);transform-origin:top}56%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

  @keyframes revealIn{from{opacity:0;transform:translateY(38px)}to{opacity:1;transform:none}}
  @supports ((animation-timeline: view()) and (animation-range: entry)){
    .reveal{animation:revealIn auto ease both;animation-timeline:view();animation-range:entry 0% entry 50%}
  }
  @supports not ((animation-timeline: view()) and (animation-range: entry)){
    .js .reveal{opacity:0;transform:translateY(38px);transition:opacity .9s ease,transform .9s cubic-bezier(.22,.61,.36,1)}
    .js .reveal.in{opacity:1;transform:none}
  }
  .hero-inner > *{animation:fadeUp 1.1s ease backwards}
  .hero-inner > *:nth-child(2){animation-delay:.15s}
  .hero-inner > *:nth-child(3){animation-delay:.3s}
  .hero-inner > *:nth-child(4){animation-delay:.45s}
  .hero-foot{animation:fadeUp 1.1s ease backwards .6s}
  @keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
}