/* ==========================================================================
   Xinsai 营销站共享样式 · site-v1.css
   --------------------------------------------------------------------------
   铁律 1:改样式必须改文件名(site-v2.css…)。/site/assets/* 走 1y immutable
           缓存,原名覆盖会被旧缓存吃掉,老访客看到的还是旧样式。
   铁律 2:深色主题由本文件钉死,不读 prefers-color-scheme(官网视觉需可控)。
   铁律 3:凡按钮相关规则覆盖 background,必须同时显式声明 color
           (全局 button 默认白字,只改背景会白字隐身——已两次生产事故)。
   铁律 4:渐入动画只在 html.js 下生效,脚本挂了内容必须直接可见(fail-open)。
   ========================================================================== */

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

:root{
  color-scheme:dark;

  /* 底色与分隔 */
  --bg:#0b0b14;
  --bg-soft:#101020;
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.16);
  --glass:rgba(255,255,255,.045);
  --glass-2:rgba(255,255,255,.075);

  /* 文字 */
  --tx:#f2f2f8;
  --tx-2:#b9b9cc;
  --tx-3:#8f8fa8;

  /* 品牌强调 */
  --vio:#a78bfa;
  --cyn:#22d3ee;
  --pnk:#e879f9;
  --grad:linear-gradient(96deg,#a78bfa 0%,#22d3ee 100%);
  --grad-deep:linear-gradient(96deg,#7c3aed 0%,#0e7490 100%);

  /* 字体与圆角 */
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --serif:"Songti SC","STSong","SimSun",Georgia,serif;
  --r:18px;
  --r-lg:26px;
  --head-h:64px;
}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--tx);
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
:focus-visible{outline:2px solid var(--cyn);outline-offset:3px;border-radius:6px}

/* 页面底光(固定,不随滚动重绘) */
.stage-light{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(900px 620px at 80% -10%, rgba(139,92,246,.20), transparent 62%),
    radial-gradient(760px 540px at -12% 20%, rgba(34,211,238,.12), transparent 60%),
    radial-gradient(680px 520px at 55% 110%, rgba(232,121,249,.08), transparent 62%);
}

/* 跳转到主内容(键盘/读屏) */
.skip{
  position:absolute;left:-9999px;top:0;z-index:99;
  padding:10px 18px;border-radius:0 0 12px 0;
  background:#12121e;color:var(--tx);font-size:.9rem;
}
.skip:focus{left:0}

/* ==========================================================================
   布局骨架
   ========================================================================== */
.wrap{width:min(1160px,92vw);margin:0 auto}
.wrap-narrow{width:min(880px,92vw);margin:0 auto}
section{padding:clamp(56px,8vw,108px) 0;position:relative}
section[id]{scroll-margin-top:calc(var(--head-h) + 12px)}
.section-tint{background:radial-gradient(760px 430px at 50% 0, rgba(139,92,246,.09), transparent 66%)}
.section-tint-c{background:radial-gradient(700px 420px at 18% 45%, rgba(34,211,238,.07), transparent 62%)}

.sec-head{max-width:780px;margin-bottom:clamp(32px,4.6vw,52px)}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{
  font-family:var(--serif);letter-spacing:.36em;font-size:.82rem;
  color:var(--cyn);margin-bottom:12px;
}
.sec-sub{color:var(--tx-2);margin-top:14px;font-size:1rem}
.sec-more{display:inline-flex;align-items:center;gap:8px;margin-top:20px;color:var(--vio);font-weight:700;font-size:.94rem}
.sec-more:hover{color:var(--cyn)}
.sec-more::after{content:"→";transition:transform .25s}
.sec-more:hover::after{transform:translateX(4px)}

h1{font-size:clamp(2.1rem,5vw,3.7rem);line-height:1.24;font-weight:900;letter-spacing:.01em}
h2{font-size:clamp(1.6rem,3.4vw,2.5rem);font-weight:900;line-height:1.32}
h3{font-size:clamp(1.1rem,1.9vw,1.35rem);font-weight:800;line-height:1.45}
.hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.num{font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ==========================================================================
   顶栏
   ========================================================================== */
.site-head{
  position:sticky;top:0;z-index:60;
  background:rgba(11,11,20,.78);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.head-inner{display:flex;align-items:center;gap:22px;min-height:var(--head-h)}
.logo{display:flex;align-items:baseline;gap:9px;font-weight:900;font-size:1.28rem;letter-spacing:.02em;flex:0 0 auto}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.logo small{font-size:.7rem;font-weight:500;color:var(--tx-3);letter-spacing:.12em}

.sitenav{display:flex;align-items:center;gap:24px;margin-left:auto;font-size:.92rem;color:var(--tx-2)}
.sitenav a{transition:color .25s;white-space:nowrap}
.sitenav a:hover{color:var(--tx)}
.sitenav a[aria-current="page"]{color:var(--tx);font-weight:700}
.nav-lang{
  color:var(--tx-3);font-size:.82rem;letter-spacing:.08em;font-weight:700;
  padding:4px 11px;border:1px solid var(--line-2);border-radius:999px;
}
.nav-lang:hover{border-color:rgba(167,139,250,.55)}

/* 汉堡:只在 html.js + 窄屏出现,无 JS 时导航直接铺开(fail-open) */
.navtoggle{
  display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;
  width:42px;height:38px;margin-left:auto;flex:0 0 auto;
  background:transparent;color:var(--tx);
  border:1px solid var(--line-2);border-radius:11px;cursor:pointer;
}
.navtoggle span{display:block;width:18px;height:2px;background:var(--tx);border-radius:2px;transition:transform .28s,opacity .2s}
.site-head.nav-open .navtoggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.site-head.nav-open .navtoggle span:nth-child(2){opacity:0}
.site-head.nav-open .navtoggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ==========================================================================
   按钮 / 徽标
   ========================================================================== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:0;cursor:pointer;font-family:inherit;text-align:center;
  border-radius:999px;font-weight:700;letter-spacing:.02em;
  transition:transform .25s,box-shadow .25s,border-color .25s;
}
.btn-p{
  background:var(--grad-deep);color:#fff;
  box-shadow:0 6px 26px rgba(124,58,237,.42),inset 0 1px 0 rgba(255,255,255,.22);
}
.btn-p:hover{transform:translateY(-2px);box-shadow:0 10px 34px rgba(124,58,237,.55),inset 0 1px 0 rgba(255,255,255,.22)}
.btn-o{background:transparent;color:var(--tx);border:1px solid rgba(167,139,250,.45)}
.btn-o:hover{transform:translateY(-2px);border-color:var(--cyn)}
.btn-sm{padding:9px 20px;font-size:.87rem}
.btn-lg{padding:15px 34px;font-size:1.04rem}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}
.btn-row.center-x{justify-content:center}

/* 正文内嵌链接(不带箭头,区别于 .sec-more) */
.link{color:var(--vio);font-weight:700;border-bottom:1px solid rgba(167,139,250,.4)}
.link:hover{color:var(--cyn);border-bottom-color:var(--cyn)}

/* 小工具类(避免行内 style,便于统一改版) */
.center{text-align:center}
.more-row{text-align:center;margin-top:26px}
.mt-lg{margin-top:clamp(28px,4vw,44px)}

.pill{
  display:inline-flex;align-items:center;gap:7px;
  font-size:.8rem;color:var(--tx-2);
  padding:6px 13px;border-radius:999px;
  background:var(--glass);border:1px solid var(--line);
}
.pill svg{width:14px;height:14px;flex:0 0 auto}
.pill-row{display:flex;flex-wrap:wrap;gap:10px}

/* ==========================================================================
   卡片
   ========================================================================== */
.card{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r);
  transition:transform .35s,border-color .35s;
}
.card:hover{transform:translateY(-6px);border-color:rgba(167,139,250,.45)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}

/* 能力卡(首页) */
.mcard{overflow:hidden;display:flex;flex-direction:column}
.mmedia{height:186px;overflow:hidden;position:relative;background:#15152233}
.mmedia::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(11,11,20,.55))}
.mmedia img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease}
.mcard:hover .mmedia img{transform:scale(1.06)}
.mmedia.trio{display:grid;grid-template-columns:1fr 1fr 1fr;gap:3px}
.mmedia.trio img{height:186px}
.mbody{padding:20px 22px 24px;flex:1}
.mbody h3{margin-bottom:8px}
.mbody p{font-size:.9rem;color:var(--tx-2)}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{padding:clamp(44px,6vw,84px) 0 clamp(48px,6vw,80px)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:46px;align-items:center}
.kicker{font-family:var(--serif);font-size:.9rem;letter-spacing:.38em;color:var(--tx-3);margin-bottom:16px}
.kicker i{font-style:normal;color:var(--cyn)}
.hero h1{margin-bottom:18px}
.hero-sub{color:var(--tx-2);font-size:clamp(.98rem,1.35vw,1.1rem);max-width:34em;margin-bottom:28px}
.hero .btn-row{margin-bottom:30px}

/* 错位悬浮拼贴 */
.collage{position:relative;height:clamp(340px,34vw,500px)}
.collage figure{
  position:absolute;border-radius:16px;overflow:hidden;
  border:1px solid rgba(255,255,255,.14);
  box-shadow:0 24px 60px rgba(0,0,0,.6),0 0 44px rgba(139,92,246,.14);
  transition:transform .45s ease;will-change:transform;
}
.collage img{width:100%;height:100%;object-fit:cover}
.collage figure:hover{transform:rotate(0deg) translateY(-8px) scale(1.03);z-index:5}
.cg1{width:46%;aspect-ratio:3/4;left:2%;top:6%;transform:rotate(-6deg);z-index:2}
.cg2{width:40%;aspect-ratio:3/4;right:4%;top:0;transform:rotate(5deg);z-index:1}
.cg3{width:38%;aspect-ratio:3/4;left:22%;bottom:0;transform:rotate(3deg);z-index:3}
.cg4{width:34%;aspect-ratio:3/4;right:8%;bottom:6%;transform:rotate(-4deg);z-index:4}

/* 页内小 hero(定价/能力/FAQ 页) */
.page-hero{padding:clamp(40px,5.4vw,72px) 0 clamp(28px,3.6vw,44px);text-align:center}
.page-hero h1{margin-bottom:16px}
.page-hero p{color:var(--tx-2);max-width:44em;margin:0 auto;font-size:clamp(.96rem,1.3vw,1.06rem)}
.page-hero .btn-row{justify-content:center;margin-top:28px}

/* ==========================================================================
   输入 → 输出 案例
   ========================================================================== */
.case{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(22px,3.2vw,42px);
  display:grid;grid-template-columns:.9fr 1.35fr;gap:clamp(22px,3.4vw,46px);align-items:center;
}
.case + .case{margin-top:34px}
.case.rev{grid-template-columns:1.35fr .9fr}
.case.rev .case-txt{order:2}
.case.rev .flow{order:1}
.case-no{font-family:var(--serif);font-size:.82rem;letter-spacing:.3em;color:var(--tx-3);margin-bottom:12px}
.case-txt h3{font-size:clamp(1.2rem,2.1vw,1.55rem);margin-bottom:12px}
.case-txt h3 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.case-txt p{color:var(--tx-2);font-size:.96rem}

.flow{display:flex;align-items:center;justify-content:center;gap:clamp(12px,1.8vw,24px)}
.flow-in{display:flex;gap:14px;align-items:flex-start}
.incard{
  position:relative;width:clamp(112px,12vw,158px);border-radius:14px;overflow:hidden;
  border:1px solid rgba(34,211,238,.4);box-shadow:0 14px 36px rgba(0,0,0,.5);background:#15152233;
}
/* height:auto 必写:HTML 的 height="…" 是表现性提示,不清掉会把 aspect-ratio 顶掉,
   图片按属性像素值撑到几百 px 高(已咬一次) */
.incard img{width:100%;height:auto;aspect-ratio:3/4;object-fit:cover}
.incard.sq img{aspect-ratio:1/1}
/* 竖版输入(9:16 全身模特图):框比图矮会被 cover 裁掉头脚,故单列比例 */
.incard.tall img{aspect-ratio:9/16}
.incap{font-size:.72rem;color:var(--tx-2);text-align:center;padding:8px 4px;line-height:1.5}
.plus{font-size:1.4rem;font-weight:300;color:var(--tx-3);align-self:center}
.tag{
  position:absolute;top:10px;left:10px;z-index:2;
  font-size:.66rem;font-weight:700;letter-spacing:.06em;
  padding:4px 10px;border-radius:999px;line-height:1.5;
}
.tag-in{background:rgba(11,11,20,.78);color:#7ee7f7;border:1px solid rgba(34,211,238,.55)}
.tag-out{background:var(--grad-deep);color:#fff;box-shadow:0 4px 16px rgba(124,58,237,.5)}
.flow-arrow{width:clamp(52px,6.4vw,104px);height:38px}
.flow-arrow path{stroke-width:2.5;fill:none;stroke-linecap:round;stroke-linejoin:round}
.flow-label{font-size:.7rem;color:var(--tx-3);letter-spacing:.16em;text-align:center;margin-top:6px}
.phone{
  position:relative;flex:0 0 auto;width:clamp(196px,20vw,252px);
  border-radius:36px;padding:10px;
  background:linear-gradient(165deg,#2b2b40,#12121e);
  border:1px solid rgba(255,255,255,.14);
  box-shadow:0 34px 80px rgba(0,0,0,.65),0 0 64px rgba(139,92,246,.16);
}
.phone::before{
  content:"";position:absolute;top:18px;left:50%;transform:translateX(-50%);
  width:78px;height:14px;background:#0a0a12;border-radius:10px;z-index:3;
}
.phone video{width:100%;aspect-ratio:9/16;object-fit:cover;border-radius:26px;display:block;background:#000}
.phone .tag{top:42px;left:20px}
.snd{
  position:absolute;right:20px;bottom:22px;z-index:3;
  width:40px;height:40px;border-radius:50%;
  border:1px solid rgba(255,255,255,.3);
  background:rgba(11,11,20,.66);color:#fff;
  font-size:1rem;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
  transition:transform .2s;
}
.snd:hover{transform:scale(1.1)}

/* ==========================================================================
   差异化
   ========================================================================== */
.diff-list{display:flex;flex-direction:column;gap:16px}
.diff-item{
  display:grid;grid-template-columns:96px 1fr;gap:24px;align-items:start;
  background:var(--glass);border:1px solid var(--line);border-radius:22px;
  padding:clamp(22px,2.8vw,34px) clamp(20px,2.8vw,38px);
  transition:transform .35s,border-color .35s;
}
.diff-item:hover{transform:translateY(-4px);border-color:rgba(34,211,238,.4)}
.diff-no{
  font-family:var(--serif);font-size:clamp(2.4rem,4.2vw,3.4rem);font-weight:700;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;opacity:.9;
}
.diff-item h3{font-size:clamp(1.16rem,2.1vw,1.5rem);font-weight:900;margin-bottom:8px}
.diff-item p{color:var(--tx-2);max-width:46em;font-size:.96rem}

/* ==========================================================================
   能力页:分栏板块
   ========================================================================== */
.feat{
  display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,3.6vw,54px);align-items:center;
  padding:clamp(30px,4vw,52px) 0;border-top:1px solid var(--line);
}
.feat:first-of-type{border-top:0}
.feat.rev .feat-txt{order:2}
.feat.rev .feat-media{order:1}
.feat-no{font-family:var(--serif);font-size:.8rem;letter-spacing:.3em;color:var(--tx-3);margin-bottom:10px}
.feat-txt h2{font-size:clamp(1.4rem,2.8vw,2rem);margin-bottom:14px}
.feat-txt p{color:var(--tx-2);margin-bottom:20px}
.feat-media{border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line-2);
  box-shadow:0 26px 64px rgba(0,0,0,.55),0 0 50px rgba(139,92,246,.12)}
.feat-media img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover}
.use-list{display:flex;flex-wrap:wrap;gap:9px}
.use-list li{
  font-size:.8rem;color:var(--tx-2);padding:6px 13px;border-radius:999px;
  background:var(--glass-2);border:1px solid var(--line);
}

/* ==========================================================================
   样片画廊 marquee
   ========================================================================== */
.gallery{padding-left:0;padding-right:0;overflow:hidden}
.gallery .sec-head{padding:0 4vw}
.marquee{
  overflow:hidden;padding:10px 0;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 7%,#000 93%,transparent);
}
.marquee + .marquee{margin-top:16px}
.track{display:flex;width:max-content;animation:slide 58s linear infinite}
.marquee.rev .track{animation-direction:reverse;animation-duration:70s}
.marquee:hover .track{animation-play-state:paused}
@keyframes slide{to{transform:translateX(-50%)}}
.gset{display:flex}
.gitem{
  flex:0 0 auto;width:clamp(160px,19vw,232px);margin-right:16px;
  border-radius:14px;overflow:hidden;border:1px solid var(--line);transition:transform .35s;
}
.gitem:hover{transform:translateY(-6px)}
.gitem img{width:100%;height:auto;aspect-ratio:3/4;object-fit:cover}
.gal-note{padding:0 4vw;text-align:center;color:var(--tx-3);font-size:.8rem;margin-top:22px}

/* ==========================================================================
   定价
   ========================================================================== */
.price-panel{
  position:relative;max-width:840px;margin:0 auto;text-align:center;
  background:var(--glass);border:1px solid rgba(167,139,250,.32);border-radius:30px;
  padding:clamp(32px,4.6vw,58px) clamp(20px,3.6vw,52px);
  box-shadow:0 0 90px rgba(139,92,246,.12) inset,0 30px 80px rgba(0,0,0,.4);
}
.price-big{
  font-size:clamp(2.2rem,5.2vw,3.6rem);font-weight:900;line-height:1.2;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 0 50px rgba(139,92,246,.3);margin-bottom:8px;
}
.price-sub{color:var(--tx-2);margin-bottom:30px}
.price-chips{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-bottom:30px}
.pchip{background:rgba(255,255,255,.035);border:1px solid var(--line);border-radius:16px;padding:20px 12px}
.pchip b{
  display:block;font-size:clamp(1.05rem,2vw,1.4rem);font-weight:900;margin-bottom:5px;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.pchip span{font-size:.8rem;color:var(--tx-2);line-height:1.55;display:block}
.price-note{font-size:.84rem;color:var(--tx-3);margin-top:18px}

/* 积分换算表 */
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--glass)}
table.credits{width:100%;border-collapse:collapse;min-width:520px;font-size:.94rem}
table.credits caption{text-align:left;padding:18px 20px 0;color:var(--tx-3);font-size:.84rem;caption-side:bottom;padding-bottom:16px}
table.credits th,table.credits td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line)}
table.credits thead th{
  font-size:.8rem;letter-spacing:.08em;color:var(--tx-3);font-weight:700;
  background:rgba(255,255,255,.03);white-space:nowrap;
}
table.credits tbody tr:last-child td{border-bottom:0}
table.credits tbody tr:hover{background:rgba(255,255,255,.025)}
table.credits td:first-child{font-weight:800;color:var(--tx);white-space:nowrap}
table.credits td em{font-style:normal;color:var(--tx-3);font-weight:500;font-size:.84rem;display:block}
table.credits .out{color:var(--tx-2)}
table.credits .out b{font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* 计费机制步骤 */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.step{background:var(--glass);border:1px solid var(--line);border-radius:var(--r);padding:26px 24px}
.step b{
  display:block;font-family:var(--serif);font-size:.78rem;letter-spacing:.28em;
  color:var(--cyn);margin-bottom:12px;
}
.step h3{margin-bottom:8px;font-size:1.06rem}
.step p{color:var(--tx-2);font-size:.9rem}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq{max-width:860px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:16px;
  padding:20px 4px;font-weight:700;font-size:1.02rem;transition:color .25s;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary:hover{color:#c4b5fd}
.faq summary .ind{
  margin-left:auto;flex:0 0 auto;width:26px;height:26px;border-radius:50%;
  border:1px solid rgba(167,139,250,.5);color:#c4b5fd;
  display:flex;align-items:center;justify-content:center;
  font-size:1rem;font-weight:400;line-height:1;transition:transform .3s;
}
.faq details[open] summary .ind{transform:rotate(45deg)}
.faq .ans{padding:0 4px 22px;color:var(--tx-2);font-size:.95rem;max-width:54em}

/* ==========================================================================
   尾部 CTA 与页脚
   ========================================================================== */
.final-cta{text-align:center}
.final-cta h2{margin-bottom:14px}
.final-cta p{color:var(--tx-2);margin-bottom:26px}
.final-cta .btn-row{justify-content:center}

.site-foot{border-top:1px solid var(--line);padding:44px 0 34px;color:var(--tx-3);font-size:.87rem}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px}
.foot-brand{font-weight:900;font-size:1.08rem;color:var(--tx);margin-bottom:6px}
.foot-brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.foot-slogan{font-family:var(--serif);letter-spacing:.08em;color:var(--tx-2);margin-bottom:12px}
.foot-mail a{color:var(--tx-2)}
.foot-mail a:hover{color:var(--cyn)}
.foot-col{display:flex;flex-direction:column;gap:9px}
.foot-h{color:var(--tx);font-weight:800;font-size:.9rem;margin-bottom:2px}
.foot-col a:hover{color:var(--tx)}
.foot-bottom{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  margin-top:32px;padding-top:20px;border-top:1px solid var(--line);font-size:.8rem;
}

/* ==========================================================================
   滚动渐入(fail-open:只有 html.js 才隐藏)
   ========================================================================== */
html.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
html.js .reveal.in{opacity:1;transform:none}
.reveal.in{opacity:1;transform:none}
.d1{transition-delay:.08s}.d2{transition-delay:.16s}.d3{transition-delay:.24s}
.d4{transition-delay:.32s}.d5{transition-delay:.4s}.d6{transition-delay:.48s}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}
.hero .fu{opacity:0;animation:fadeUp .8s ease forwards}
.fu1{animation-delay:.05s}.fu2{animation-delay:.16s}.fu3{animation-delay:.28s}
.fu4{animation-delay:.4s}.fu5{animation-delay:.5s}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}
  .reveal,.hero .fu{opacity:1!important;transform:none!important}
}

/* ==========================================================================
   响应式:1440 → 375
   ========================================================================== */
@media (max-width:1023px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .collage{height:clamp(300px,52vw,420px);max-width:560px}
  .grid-3,.steps{grid-template-columns:1fr 1fr}
  .case,.case.rev{grid-template-columns:1fr}
  .case.rev .case-txt{order:1}
  .case.rev .flow{order:2}
  .feat,.feat.rev{grid-template-columns:1fr;gap:24px}
  .feat.rev .feat-txt{order:1}
  .feat.rev .feat-media{order:2}
  .price-chips{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
}

@media (max-width:900px){
  html.js .navtoggle{display:inline-flex}
  html.js .sitenav{
    position:absolute;left:0;right:0;top:100%;
    flex-direction:column;align-items:stretch;gap:4px;
    margin:0;padding:14px 4vw calc(18px + env(safe-area-inset-bottom));
    background:var(--bg); /* 必须全不透明:半透明会漏出下方案例图,读起来像糊了 */
    -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
    box-shadow:0 22px 50px rgba(0,0,0,.55);
    border-bottom:1px solid var(--line);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .25s,transform .25s,visibility .25s;
  }
  html.js .site-head.nav-open .sitenav{opacity:1;visibility:visible;transform:none}
  html.js .sitenav a{padding:11px 6px;font-size:1rem;border-bottom:1px solid var(--line)}
  html.js .sitenav .nav-lang{border:1px solid var(--line-2);width:max-content;margin-top:10px;padding:6px 14px;font-size:.82rem}
  html.js .sitenav .nav-cta{margin-top:12px;padding:13px 20px;font-size:1rem;border-bottom:0}
  /* 无 JS 兜底:导航折行铺开,依然可点 */
  .sitenav{flex-wrap:wrap;gap:14px 18px;font-size:.86rem}
}

@media (max-width:767px){
  :root{--head-h:58px}
  .kicker{letter-spacing:.2em;font-size:.76rem}
  .grid-3,.grid-2,.steps{grid-template-columns:1fr}
  .price-chips{grid-template-columns:1fr 1fr}
  .diff-item{grid-template-columns:1fr;gap:6px;padding:22px 20px}
  .diff-no{font-size:2.1rem}
  .flow{flex-direction:column}
  /* 只转箭头,别转整块:整体 rotate(90deg) 会把「多模型智能调度」标签也转成竖排(20px宽×91px高) */
  .flow-mid{transform:none;display:flex;flex-direction:column;align-items:center}
  .flow-mid .flow-arrow{transform:rotate(90deg)}
  .flow-label{margin-top:6px}
  .foot-grid{grid-template-columns:1fr;gap:24px}
  .foot-bottom{flex-direction:column;gap:6px}
  .btn-lg{padding:14px 26px;font-size:1rem}
  .hero{padding-top:32px}
}

@media (max-width:400px){
  .logo small{display:none}
  .btn-row .btn{width:100%}
  .price-chips{grid-template-columns:1fr}
  .incard{width:126px}
}