/* ==========================================================================
   南京音音值信息科技有限公司 — 官网样式
   纯原生 CSS，无外部依赖；PC / H5 自适应
   ========================================================================== */

/* ---------- 设计变量 ---------- */
:root{
  --brand:#2E6BFF;
  --brand-deep:#1B4BE0;
  --brand-2:#00C2B8;
  --ink:#0B1220;
  --text:#16203A;
  --muted:#66738C;
  --line:#E7ECF4;
  --soft:#F6F9FD;
  --white:#fff;

  --grad:linear-gradient(120deg,#2E6BFF 0%,#4E8CFF 45%,#00C2B8 100%);
  --grad-soft:linear-gradient(120deg,rgba(46,107,255,.10),rgba(0,194,184,.10));

  --radius:16px;
  --radius-lg:22px;
  --shadow-sm:0 2px 10px rgba(11,18,32,.05);
  --shadow:0 14px 40px -14px rgba(11,18,32,.16);
  --shadow-lg:0 30px 70px -30px rgba(11,18,32,.30);

  --container:1180px;
  --header-h:68px;
  --ease:cubic-bezier(.22,.61,.36,1);

  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",
         "Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",
         "WenQuanYi Micro Hei",Arial,sans-serif;
}

/* ---------- 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  background:var(--white);
}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}
body.is-locked{overflow:hidden}
img,svg{display:block;max-width:100%}
a{color:var(--brand);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--brand-deep)}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0}
ul,ol{padding:0;list-style:none}
strong{font-weight:600;color:var(--ink)}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.skip-link{
  position:fixed;top:-60px;left:16px;z-index:200;
  padding:10px 16px;border-radius:0 0 10px 10px;
  background:var(--ink);color:#fff;font-size:14px;transition:top .2s var(--ease);
}
.skip-link:focus{top:0;color:#fff}

/* ---------- 通用容器 ---------- */
.container{
  width:100%;max-width:var(--container);
  margin-inline:auto;
  padding-inline:20px;
}
.muted{color:var(--muted)}

/* ---------- 按钮 ---------- */
.btn{
  --btn-bg:var(--brand);
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.01em;line-height:1.4;
  white-space:nowrap;cursor:pointer;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),
             background-color .25s var(--ease),color .25s var(--ease);
}
.btn--primary{
  background:var(--grad);color:#fff;
  background-size:160% 100%;
  box-shadow:0 12px 26px -12px rgba(46,107,255,.75);
}
.btn--primary:hover{
  color:#fff;transform:translateY(-2px);
  background-position:100% 0;
  box-shadow:0 18px 34px -14px rgba(46,107,255,.85);
}
.btn--ghost{
  background:#fff;color:var(--ink);
  box-shadow:inset 0 0 0 1px var(--line),var(--shadow-sm);
}
.btn--ghost:hover{color:var(--brand);box-shadow:inset 0 0 0 1px rgba(46,107,255,.35),var(--shadow)}
.btn--sm{padding:9px 18px;font-size:14px}
.btn--block{display:flex;width:100%}
.btn:active{transform:translateY(0)}

/* ---------- 头部导航 ---------- */
.header{
  position:fixed;inset:0 0 auto 0;z-index:100;
  height:var(--header-h);
  display:flex;align-items:center;
  background:rgba(255,255,255,0);
  transition:background-color .3s var(--ease),box-shadow .3s var(--ease),
             backdrop-filter .3s var(--ease);
}
.header.is-scrolled{
  background:rgba(255,255,255,.82);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  backdrop-filter:saturate(180%) blur(14px);
  box-shadow:0 1px 0 rgba(11,18,32,.06),0 10px 30px -22px rgba(11,18,32,.4);
}
.header__inner{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}

.brand{display:inline-flex;align-items:center;gap:11px;color:var(--ink)}
.brand:hover{color:var(--ink)}
.brand__mark{display:block;flex:none;filter:drop-shadow(0 6px 14px rgba(46,107,255,.32))}
.brand__text{display:flex;flex-direction:column;line-height:1.12}
.brand__text strong{font-size:18px;font-weight:700;letter-spacing:.06em;color:var(--ink)}
.brand__text small{font-size:10px;letter-spacing:.26em;color:var(--muted);font-weight:600}

.nav{display:flex;align-items:center;gap:28px}
.nav__list{display:flex;align-items:center;gap:4px}
.nav__link{
  position:relative;display:block;
  padding:8px 13px;border-radius:10px;
  font-size:15px;font-weight:500;color:var(--text);
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:50%;bottom:2px;
  width:0;height:2px;border-radius:2px;background:var(--grad);
  transform:translateX(-50%);transition:width .28s var(--ease);
}
.nav__link:hover{color:var(--brand);background:rgba(46,107,255,.06)}
.nav__link.is-active{color:var(--brand);font-weight:600}
.nav__link.is-active::after{width:20px}

.burger{
  display:none;width:42px;height:42px;flex:none;
  border-radius:12px;position:relative;
  box-shadow:inset 0 0 0 1px var(--line);
  background:rgba(255,255,255,.7);
}
.burger span{
  position:absolute;left:11px;right:11px;height:2px;border-radius:2px;
  background:var(--ink);transition:transform .3s var(--ease),opacity .2s var(--ease),top .3s var(--ease);
}
.burger span:nth-child(1){top:14px}
.burger span:nth-child(2){top:20px}
.burger span:nth-child(3){top:26px}
.burger.is-open span:nth-child(1){top:20px;transform:rotate(45deg)}
.burger.is-open span:nth-child(2){opacity:0}
.burger.is-open span:nth-child(3){top:20px;transform:rotate(-45deg)}

.nav-mask{
  position:fixed;inset:0;z-index:90;
  background:rgba(11,18,32,.42);
  -webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);
  opacity:0;transition:opacity .28s var(--ease);
}
.nav-mask.is-open{opacity:1}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;overflow:hidden;
  padding:calc(var(--header-h) + 92px) 0 108px;
  background:
    radial-gradient(1200px 600px at 78% -12%,rgba(0,194,184,.13),transparent 62%),
    radial-gradient(900px 520px at 12% 4%,rgba(46,107,255,.14),transparent 60%),
    linear-gradient(180deg,#FBFDFF 0%,#F4F8FF 62%,#FFFFFF 100%);
  isolation:isolate;
}
.hero__bg{position:absolute;inset:0;z-index:-1;pointer-events:none}
.hero__grid{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(11,18,32,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(11,18,32,.045) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(circle at 50% 24%,#000 0%,transparent 72%);
  mask-image:radial-gradient(circle at 50% 24%,#000 0%,transparent 72%);
}
.orb{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5}
.orb--a{width:420px;height:420px;top:-140px;right:-80px;background:rgba(46,107,255,.45);animation:float 16s var(--ease) infinite}
.orb--b{width:340px;height:340px;top:180px;left:-120px;background:rgba(0,194,184,.42);animation:float 20s var(--ease) infinite reverse}
.orb--c{width:220px;height:220px;bottom:-60px;left:42%;background:rgba(126,168,255,.4);animation:float 24s var(--ease) infinite}
@keyframes float{
  0%,100%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(22px,-26px,0) scale(1.08)}
}

.hero__inner{position:relative;max-width:900px}
.pill{
  display:inline-flex;align-items:center;gap:9px;
  padding:7px 15px 7px 12px;margin-bottom:26px;
  border-radius:999px;background:rgba(255,255,255,.86);
  box-shadow:inset 0 0 0 1px rgba(46,107,255,.18),var(--shadow-sm);
  font-size:13.5px;font-weight:600;color:#31405C;letter-spacing:.02em;
}
.pill__dot{
  width:7px;height:7px;border-radius:50%;background:var(--brand-2);
  box-shadow:0 0 0 0 rgba(0,194,184,.55);animation:pulse 2.4s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(0,194,184,.5)}
  70%{box-shadow:0 0 0 9px rgba(0,194,184,0)}
  100%{box-shadow:0 0 0 0 rgba(0,194,184,0)}
}

.hero__title{
  font-size:clamp(34px,6.4vw,64px);
  line-height:1.14;font-weight:800;letter-spacing:-.02em;
  color:var(--ink);
}
.hero__title .grad{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;
  color:transparent;-webkit-text-fill-color:transparent;
}
.hero__lead{
  margin-top:24px;max-width:660px;
  font-size:clamp(15px,1.6vw,17.5px);line-height:1.85;color:#3C4A66;
}
.hero__lead strong{color:var(--ink);font-weight:600}
.hero__actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}

.hero__stats{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:18px;margin-top:64px;padding-top:30px;
  border-top:1px solid rgba(11,18,32,.08);
}
.hero__stats li{display:flex;flex-direction:column;gap:2px}
.hero__stats b{
  font-size:clamp(20px,2.4vw,27px);font-weight:800;letter-spacing:-.01em;
  color:var(--ink);line-height:1.25;
}
.hero__stats b em{font-style:normal;font-size:.56em;font-weight:700;color:var(--muted);margin-left:3px}
.hero__stats span{font-size:13.5px;color:var(--muted)}

.wave{
  position:absolute;left:0;right:0;bottom:0;height:74px;
  display:flex;align-items:flex-end;justify-content:center;gap:7px;
  padding:0 20px;opacity:.5;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 22%,#000 78%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 22%,#000 78%,transparent);
}
.wave i{
  flex:1 1 0;max-width:16px;height:var(--h);border-radius:6px 6px 0 0;
  background:linear-gradient(180deg,rgba(0,194,184,.85),rgba(46,107,255,.28));
  transform-origin:bottom;
  animation:eq 2.6s var(--ease) infinite alternate;
  animation-delay:var(--d);
}
@keyframes eq{from{transform:scaleY(.32)}to{transform:scaleY(1)}}

/* ---------- 区块骨架 ---------- */
.section{
  position:relative;
  padding:clamp(66px,9vw,112px) 0;
  scroll-margin-top:var(--header-h);
}
.section--soft{
  background:linear-gradient(180deg,#F7FAFF 0%,#FBFDFF 100%);
  border-block:1px solid var(--line);
}
.sec-head{max-width:720px;margin-bottom:clamp(34px,4.5vw,56px)}
.sec-head__eyebrow{
  font-size:12.5px;font-weight:700;letter-spacing:.22em;
  color:var(--brand);margin-bottom:10px;
}
.sec-head__title{
  font-size:clamp(25px,3.4vw,38px);font-weight:800;letter-spacing:-.015em;
  color:var(--ink);line-height:1.25;
  position:relative;padding-bottom:16px;
}
.sec-head__title::after{
  content:"";position:absolute;left:0;bottom:0;
  width:52px;height:3px;border-radius:3px;background:var(--grad);
}
.sec-head__desc{margin-top:16px;font-size:16px;color:var(--muted)}

/* ---------- 关于我们 ---------- */
.about{
  display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);
  gap:clamp(24px,4vw,54px);align-items:start;
}
.about__text p{color:#3C4A66;margin-bottom:16px;font-size:16px}
.about__text p:last-of-type{margin-bottom:0}
.about__points{margin-top:26px;display:grid;gap:12px}
.about__points li{
  display:flex;align-items:flex-start;gap:11px;
  font-size:15.5px;color:var(--ink);font-weight:500;
}
.tick{
  flex:none;width:20px;height:20px;margin-top:4px;border-radius:50%;
  background:var(--grad-soft);position:relative;
}
.tick::after{
  content:"";position:absolute;left:6.5px;top:6px;
  width:6px;height:3px;border-left:1.8px solid var(--brand);
  border-bottom:1.8px solid var(--brand);transform:rotate(-45deg);
}

.about__card{
  background:#fff;border-radius:var(--radius-lg);
  padding:28px 26px;
  box-shadow:var(--shadow);border:1px solid var(--line);
  position:relative;overflow:hidden;
}
.about__card::before{
  content:"";position:absolute;inset:0 0 auto 0;height:4px;background:var(--grad);
}
.about__card-title{
  font-size:17px;font-weight:700;color:var(--ink);margin-bottom:18px;
  display:flex;align-items:center;gap:9px;
}
.about__card-title::before{
  content:"";width:4px;height:16px;border-radius:3px;background:var(--grad);
}
.kv{display:grid;gap:0}
.kv > div{
  display:grid;grid-template-columns:96px minmax(0,1fr);gap:12px;
  padding:11px 0;border-bottom:1px dashed var(--line);
}
.kv > div:last-child{border-bottom:0;padding-bottom:0}
.kv dt{font-size:13.5px;color:var(--muted);white-space:nowrap}
.kv dd{font-size:14.5px;color:var(--ink);font-weight:500;line-height:1.6;word-break:break-word}
.kv--mono{font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;letter-spacing:.01em;font-size:13.5px !important}

/* ---------- 业务卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.card{
  position:relative;display:flex;flex-direction:column;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:30px 26px 26px;
  box-shadow:var(--shadow-sm);
  transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease);
}
.card:hover{
  transform:translateY(-6px);
  border-color:rgba(46,107,255,.28);
  box-shadow:var(--shadow-lg);
}
.card__icon{
  display:inline-flex;align-items:center;justify-content:center;
  width:50px;height:50px;margin-bottom:18px;border-radius:15px;
  background:var(--grad-soft);color:var(--brand-deep);
  box-shadow:inset 0 0 0 1px rgba(46,107,255,.12);
}
.card__icon svg{width:24px;height:24px}
.card__title{font-size:18.5px;font-weight:700;color:var(--ink);margin-bottom:10px;letter-spacing:-.01em}
.card__desc{font-size:14.5px;color:var(--muted);margin-bottom:18px}

.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto}
.chips li{
  padding:5px 12px;border-radius:8px;
  background:var(--soft);border:1px solid var(--line);
  font-size:13px;color:#41506E;line-height:1.6;
}

/* 特色（许可项目）卡片 */
.card--feature{
  grid-column:span 3;
  background:linear-gradient(125deg,#0B1220 0%,#152A55 52%,#0E3F63 100%);
  border-color:transparent;color:#D8E2F5;overflow:hidden;
}
.card--feature::after{
  content:"";position:absolute;right:-90px;top:-90px;width:300px;height:300px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,194,184,.34),transparent 68%);
}
.card--feature:hover{border-color:transparent;box-shadow:0 34px 70px -34px rgba(11,18,32,.6)}
.card--feature .card__title{color:#fff;font-size:20px}
.card--feature .card__desc{color:#A9B9D6;max-width:640px}
.card--feature .chips li{
  background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16);
  color:#E6EEFF;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);
}
.card__tag{
  position:absolute;right:24px;top:24px;
  padding:5px 13px;border-radius:999px;
  background:rgba(0,194,184,.16);border:1px solid rgba(0,194,184,.4);
  color:#7FF0E6;font-size:12.5px;font-weight:700;letter-spacing:.08em;
}
.card__note{margin-top:16px;font-size:12.5px;color:#8FA3C6}

/* ---------- 服务优势 ---------- */
.features{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:20px;margin-bottom:clamp(30px,4vw,50px);
}
.feature{
  position:relative;padding:28px 24px 26px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.feature:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.feature__no{
  display:block;font-size:13px;font-weight:800;letter-spacing:.14em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;
  color:transparent;-webkit-text-fill-color:transparent;margin-bottom:12px;
}
.feature h3{font-size:17.5px;font-weight:700;color:var(--ink);margin-bottom:10px}
.feature p{font-size:14.5px;color:var(--muted);line-height:1.8}

.principles{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
}
.principles__item{background:#fff;padding:26px 28px}
.principles__item h3{
  font-size:15px;font-weight:700;color:var(--brand);margin-bottom:8px;letter-spacing:.02em;
}
.principles__item p{font-size:15px;color:var(--ink);font-weight:500}

/* ---------- 工商信息 ---------- */
.profile{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:var(--shadow-sm);
}
.profile__table{width:100%;border-collapse:collapse}
.profile__table th,
.profile__table td{
  padding:16px 24px;text-align:left;vertical-align:top;
  font-size:14.5px;line-height:1.85;
  border-bottom:1px solid var(--line);
}
.profile__table tr:last-child th,
.profile__table tr:last-child td{border-bottom:0}
.profile__table th{
  width:170px;font-weight:600;color:var(--muted);
  background:linear-gradient(90deg,#F8FBFF,#FBFDFF);
  white-space:nowrap;
}
.profile__table td{color:var(--ink)}
.profile__table tbody tr{transition:background-color .2s var(--ease)}
.profile__table tbody tr:hover{background:rgba(46,107,255,.028)}
.profile__note{
  padding:14px 24px;background:#F8FBFF;border-top:1px solid var(--line);
  font-size:13px;color:var(--muted);
}

/* ---------- 联系我们 ---------- */
.contact{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:clamp(24px,4vw,54px)}
.contact__lead{margin-top:16px;font-size:16px;color:#3C4A66;max-width:560px}
.contact__list{display:grid;gap:14px;margin-top:30px}
.contact__list li{
  display:flex;align-items:flex-start;gap:14px;
  padding:16px 18px;border-radius:var(--radius);
  background:var(--soft);border:1px solid var(--line);
  transition:border-color .25s var(--ease),background-color .25s var(--ease);
}
.contact__list li:hover{border-color:rgba(46,107,255,.28);background:#fff}
.contact__ico{
  flex:none;display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:11px;background:#fff;color:var(--brand);
  box-shadow:inset 0 0 0 1px rgba(46,107,255,.16);
}
.contact__ico svg{width:19px;height:19px}
.contact__list b{display:block;font-size:13.5px;color:var(--muted);font-weight:600;margin-bottom:2px}
.contact__list span{font-size:15.5px;color:var(--ink);font-weight:500;line-height:1.7}

.contact__card{
  background:linear-gradient(160deg,#0B1220,#132A52 60%,#0D3A5C);
  border-radius:var(--radius-lg);padding:34px 30px;
  color:#C9D6EE;box-shadow:var(--shadow-lg);
  position:relative;overflow:hidden;
}
.contact__card::after{
  content:"";position:absolute;right:-70px;bottom:-90px;width:240px;height:240px;border-radius:50%;
  background:radial-gradient(circle,rgba(46,107,255,.42),transparent 70%);
}
.contact__card h3{font-size:20px;color:#fff;margin-bottom:12px;position:relative}
.contact__card > p{font-size:14.5px;color:#A6B6D4;position:relative}
.contact__steps{
  counter-reset:s;margin:20px 0 26px;display:grid;gap:10px;position:relative;
}
.contact__steps li{
  counter-increment:s;position:relative;padding-left:30px;
  font-size:14.5px;color:#DCE6F8;
}
.contact__steps li::before{
  content:counter(s);position:absolute;left:0;top:3px;
  width:20px;height:20px;border-radius:50%;
  display:grid;place-items:center;
  background:rgba(46,107,255,.24);border:1px solid rgba(120,170,255,.4);
  font-size:11px;font-weight:700;color:#BBD1FF;
}
.contact__card .btn{position:relative;margin-bottom:14px}
.contact__tip{font-size:12.5px !important;color:#7E90B4 !important;position:relative;text-align:center}

/* ---------- 页脚 ---------- */
.footer{
  background:var(--ink);color:#93A3C0;
  padding:52px 0 40px;font-size:14px;
}
.footer__inner{
  display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,auto) minmax(0,auto);
  gap:32px;align-items:start;
}
.footer__brand{display:flex;align-items:flex-start;gap:13px}
.footer__brand strong{display:block;color:#fff;font-size:15.5px;font-weight:700;letter-spacing:.01em}
.footer__brand p{margin-top:5px;font-size:13.5px;color:#7E90B4}
.footer__nav{display:flex;flex-wrap:wrap;gap:8px 22px}
.footer__nav a{color:#A9B9D6;font-size:14px}
.footer__nav a:hover{color:#fff}
.footer__legal{text-align:right;display:grid;gap:6px}
.footer__legal p{font-size:13px;color:#8194B4}
.footer__legal a{color:#A9B9D6;border-bottom:1px solid rgba(169,185,214,.32);padding-bottom:1px}
.footer__legal a:hover{color:#fff;border-color:#fff}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:80;
  width:46px;height:46px;border-radius:14px;
  display:grid;place-items:center;
  background:#fff;color:var(--ink);
  box-shadow:inset 0 0 0 1px var(--line),var(--shadow);
  opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .3s var(--ease),transform .3s var(--ease),
             visibility .3s var(--ease),color .2s var(--ease);
}
.to-top svg{width:20px;height:20px}
.to-top.is-show{opacity:1;visibility:visible;transform:none}
.to-top:hover{color:var(--brand)}

/* ---------- 进场动画 ---------- */
.reveal{opacity:0;transform:translateY(22px)}
.reveal.is-in{
  opacity:1;transform:none;
  transition:opacity .7s var(--ease),transform .7s var(--ease);
  transition-delay:var(--delay,0ms);
}

/* ==========================================================================
   响应式
   ========================================================================== */

/* 平板 */
@media (max-width:1024px){
  .nav{gap:14px}
  .nav__link{padding:8px 10px;font-size:14.5px}
  .nav__cta{display:none}
  .cards{grid-template-columns:repeat(2,minmax(0,1fr))}
  .card--feature{grid-column:span 2}
  .features{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__inner{grid-template-columns:1fr 1fr;gap:26px}
  .footer__legal{grid-column:span 2;text-align:left}
}

/* 移动端：抽屉式导航 */
@media (max-width:900px){
  :root{--header-h:62px}
  .burger{display:block}
  .nav{
    position:fixed;top:0;right:0;z-index:95;
    width:min(84vw,340px);height:100dvh;
    flex-direction:column;align-items:stretch;gap:0;
    padding:calc(var(--header-h) + 18px) 22px 30px;
    background:#fff;
    box-shadow:-24px 0 60px -30px rgba(11,18,32,.5);
    transform:translateX(102%);
    transition:transform .34s var(--ease);
    overflow-y:auto;
    overscroll-behavior:contain;
  }
  .nav.is-open{transform:none}
  .nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .nav__link{
    padding:14px 14px;font-size:16.5px;border-radius:12px;
  }
  .nav__link::after{display:none}
  .nav__link.is-active{background:var(--grad-soft)}
  .nav__cta{display:inline-flex;margin-top:20px;padding:14px 26px;font-size:15.5px}

  .hero{padding:calc(var(--header-h) + 62px) 0 86px}
  .hero__stats{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 16px;margin-top:48px}
  .wave{height:56px;gap:5px}

  .about{grid-template-columns:minmax(0,1fr)}
  .contact{grid-template-columns:minmax(0,1fr)}
  .principles{grid-template-columns:minmax(0,1fr)}
}

/* 手机 */
@media (max-width:640px){
  body{font-size:15.5px}
  .container{padding-inline:18px}
  .section{padding:60px 0}
  .sec-head{margin-bottom:30px}

  .hero{padding:calc(var(--header-h) + 46px) 0 74px}
  .pill{font-size:12.5px;padding:6px 13px 6px 10px;margin-bottom:20px}
  .hero__lead{font-size:15.5px;margin-top:20px}
  .hero__actions{gap:11px;margin-top:28px}
  .hero__actions .btn{flex:1 1 150px;padding:13px 20px}
  .hero__stats{margin-top:40px;padding-top:24px}
  .hero__stats b{font-size:21px}
  .hero__stats span{font-size:12.5px}

  .cards{grid-template-columns:minmax(0,1fr);gap:16px}
  .card--feature{grid-column:span 1;padding:26px 22px}
  .card__tag{position:static;display:inline-block;margin-bottom:14px}
  .card{padding:26px 22px 22px}
  .features{grid-template-columns:minmax(0,1fr);gap:14px}
  .feature{padding:24px 22px}
  .principles__item{padding:22px}

  .about__card{padding:24px 20px}
  .kv > div{grid-template-columns:minmax(0,1fr);gap:2px;padding:12px 0}

  .profile__table th,
  .profile__table td{display:block;width:100%;padding:12px 18px}
  .profile__table th{
    background:#F8FBFF;border-bottom:0;font-size:13px;
    padding-bottom:4px;
  }
  .profile__table td{padding-top:2px;border-bottom:1px solid var(--line);font-size:14.5px}
  .profile__note{padding:12px 18px}

  .contact__list li{padding:14px 16px;gap:12px}
  .contact__card{padding:28px 22px}

  .footer{padding:44px 0 34px}
  .footer__inner{grid-template-columns:minmax(0,1fr);gap:24px}
  .footer__legal{grid-column:span 1}
  .footer__nav{gap:8px 18px}
  .to-top{right:14px;bottom:16px;width:42px;height:42px}
}

/* 超小屏 */
@media (max-width:380px){
  .brand__text small{display:none}
  .hero__stats{grid-template-columns:minmax(0,1fr)}
}

/* 无障碍：减少动效 */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none}
}

/* 打印 */
@media print{
  .header,.to-top,.wave,.orb,.hero__grid,.nav-mask{display:none !important}
  .hero{padding-top:24px;background:#fff}
  .reveal{opacity:1;transform:none}
  .section{padding:22px 0;break-inside:avoid}
}