/* ================= 基础重置 ================= */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  /* 明亮大气风：白底 + 海军蓝主色 + 暖金辅色 */
  --bg:#ffffff;
  --bg-2:#f7f5f0;        /* 米白区块 */
  --bg-3:#f1ede4;        /* 更深一档浅米 */
  --panel:#ffffff;
  --panel-line:#e6e1d6;
  --line:#ebe6dc;
  --txt:#0d1b2a;         /* 深海军蓝，主文字 */
  --txt-dim:#54617a;
  --txt-mut:#8a93a8;
  --ink:#0a2540;         /* 标题深蓝 */
  --navy:#0a3d62;        /* 主品牌海军蓝 */
  --navy-2:#1a5485;
  --gold:#b08740;        /* 暖金辅色 */
  --gold-soft:#d4af37;
  --radius:14px;
  --radius-sm:10px;
  --shadow-sm:0 4px 16px -4px rgba(13,27,42,.06);
  --shadow:0 18px 50px -20px rgba(13,27,42,.12);
  --shadow-lg:0 30px 80px -30px rgba(13,27,42,.18);
  --ease:cubic-bezier(.16,.84,.44,1);
}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:"Noto Sans SC","PingFang SC","Microsoft Yahei",sans-serif;
  font-weight:400;
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  position:relative;
}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
img{max-width:100%;display:block}
::selection{background:var(--navy);color:#fff}

/* ================= 背景层（明亮风：细线网格 + 暖色晕染） ================= */
.bg-grid{
  position:fixed;inset:0;z-index:-3;
  background-image:
    linear-gradient(rgba(10,61,98,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(10,61,98,.04) 1px,transparent 1px);
  background-size:80px 80px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 20%,#000 30%,transparent 100%);
}
.bg-glow{
  position:fixed;z-index:-2;border-radius:50%;filter:blur(140px);opacity:.35;
  pointer-events:none;
}
.bg-glow--1{width:620px;height:620px;background:radial-gradient(circle,rgba(10,61,98,.18) 0%,transparent 70%);top:-220px;left:-160px}
.bg-glow--2{width:520px;height:520px;background:radial-gradient(circle,rgba(176,135,64,.14) 0%,transparent 70%);top:38%;right:-160px}

/* ================= 通用容器 ================= */
.section{padding:120px 6vw;position:relative}
.section--tint{background:var(--bg-2)}
.section__head{max-width:900px;margin:0 auto 64px;text-align:center}
.section__head--center{margin-bottom:56px}
.section__tag{
  display:inline-block;font-family:"Orbitron",monospace;font-size:11px;letter-spacing:.32em;
  color:var(--navy);padding:6px 16px;border:1px solid var(--panel-line);border-radius:30px;
  background:#fff;margin-bottom:24px;text-transform:uppercase;
}
.section__title{
  font-weight:700;font-size:clamp(28px,4.2vw,48px);line-height:1.2;letter-spacing:-.01em;
  color:var(--ink);
}
.section__title .accent{
  color:var(--navy);
  position:relative;
}
.section__title .accent::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:8px;
  background:rgba(176,135,64,.18);z-index:-1;border-radius:4px;
}
.section__lead{color:var(--txt-dim);margin-top:18px;font-size:16px;max-width:680px;margin-left:auto;margin-right:auto}

.glass{
  background:var(--panel);
  border:1px solid var(--panel-line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  position:relative;overflow:hidden;
}

/* ================= 按钮 ================= */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:15px 30px;border-radius:4px;font-weight:500;
  transition:all .35s var(--ease);cursor:pointer;position:relative;overflow:hidden;
  font-size:15px;letter-spacing:.02em;
}
.btn--primary{
  background:var(--navy);
  color:#fff;font-weight:600;
  box-shadow:0 8px 24px -10px rgba(10,61,98,.5);
}
.btn--primary:hover{transform:translateY(-2px);background:var(--navy-2);box-shadow:0 14px 32px -10px rgba(10,61,98,.6)}
.btn--primary svg{transition:transform .35s var(--ease)}
.btn--primary:hover svg{transform:translateX(4px)}
.btn--ghost{
  border:1px solid var(--navy);color:var(--navy);background:transparent;
}
.btn--ghost:hover{background:var(--navy);color:#fff}
.btn--gold{
  background:var(--gold);color:#fff;font-weight:600;
  box-shadow:0 8px 24px -10px rgba(176,135,64,.5);
}
.btn--gold:hover{transform:translateY(-2px);background:#9c7438;box-shadow:0 14px 32px -10px rgba(176,135,64,.6)}
.btn--block{width:100%;justify-content:center;margin-top:6px}

/* ================= 导航 ================= */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:all .35s var(--ease);
  border-bottom:1px solid transparent;
  background:rgba(255,255,255,.6);backdrop-filter:blur(12px);
}
.nav.is-scrolled{
  background:rgba(255,255,255,.92);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--panel-line);
  box-shadow:0 4px 20px -8px rgba(13,27,42,.06);
}
.nav__inner{
  max-width:1400px;margin:0 auto;padding:18px 6vw;
  display:flex;align-items:center;gap:36px;
}
.logo{display:flex;align-items:center;gap:12px}
.logo__mark{display:grid;place-items:center;width:42px;height:42px;border-radius:8px;
  background:var(--navy);border:1px solid var(--navy)}
.logo__text{display:flex;flex-direction:column;line-height:1.15}
.logo__cn{font-weight:700;font-size:18px;color:var(--ink)}
.logo__en{font-family:"Orbitron",monospace;font-size:10px;letter-spacing:.25em;color:var(--txt-dim)}
.nav__links{display:flex;gap:32px;margin-left:auto}
.nav__link{font-size:14px;color:var(--txt-dim);font-weight:500;transition:color .3s;position:relative}
.nav__link::after{
  content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;
  background:var(--navy);transition:width .3s var(--ease);
}
.nav__link:hover{color:var(--ink)}
.nav__link:hover::after,.nav__link.is-active::after{width:100%}
.nav__cta{
  display:inline-flex;align-items:center;gap:8px;padding:9px 18px;
  border:1px solid var(--navy);border-radius:30px;
  font-family:"Orbitron",monospace;font-size:13px;color:var(--navy);
  background:#fff;transition:all .3s var(--ease);
}
.nav__cta:hover{background:var(--navy);color:#fff}
.nav__cta-dot{width:7px;height:7px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px rgba(176,135,64,.7);animation:pulse 2s infinite}
.nav__burger{display:none;flex-direction:column;gap:5px;padding:8px;margin-left:auto}
.nav__burger span{width:24px;height:2px;background:var(--ink);transition:all .3s}
.nav__burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav__burger.is-open span:nth-child(2){opacity:0}
.nav__burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@keyframes pulse{
  0%,100%{transform:scale(1);opacity:1}
  50%{transform:scale(1.5);opacity:.6}
}

/* ================= 移动抽屉 ================= */
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(80vw,320px);z-index:99;
  background:rgba(255,255,255,.98);backdrop-filter:blur(20px);
  border-left:1px solid var(--panel-line);
  box-shadow:-20px 0 60px -30px rgba(13,27,42,.18);
  display:flex;flex-direction:column;gap:8px;padding:90px 24px 24px;
  transform:translateX(100%);transition:transform .35s var(--ease);
}
.drawer.is-open{transform:translateX(0)}
.drawer__link{padding:14px 0;border-bottom:1px solid var(--line);color:var(--txt-dim);font-weight:500}
.drawer__link:hover{color:var(--navy)}
.drawer__cta{margin-top:auto;padding:14px;text-align:center;border-radius:30px;
  background:var(--navy);color:#fff;font-weight:600}

/* ================= HERO ================= */
.hero{
  min-height:88vh;display:flex;align-items:center;position:relative;
  padding:140px 6vw 80px;overflow:hidden;
  background:linear-gradient(180deg,#fff 0%,var(--bg-2) 100%);
}
.hero__bg-img{
  position:absolute;inset:0;z-index:0;
  background-size:cover;background-position:center;background-repeat:no-repeat;
  filter:saturate(1) brightness(1.02) contrast(1);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.0) 0%,rgba(255,255,255,.0) 60%,#fff 100%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.5) 0%,rgba(255,255,255,.2) 55%,#fff 100%);
  opacity:.32;transition:transform 12s linear;
}
.hero:hover .hero__bg-img{transform:scale(1.04)}
.hero__bg-text{
  position:absolute;top:6%;left:50%;transform:translateX(-50%);
  font-family:"Orbitron",monospace;font-weight:900;font-size:clamp(80px,22vw,360px);
  letter-spacing:.05em;
  background:linear-gradient(180deg,rgba(10,61,98,.05),transparent 70%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  white-space:nowrap;line-height:1;pointer-events:none;z-index:0;
}
.hero__inner{position:relative;z-index:2;max-width:1180px;margin:0 auto;text-align:center;width:100%}
.hero__eyebrow{
  display:inline-flex;align-items:center;gap:14px;
  font-family:"Orbitron",monospace;font-size:11px;letter-spacing:.3em;
  color:var(--navy);margin-bottom:28px;text-transform:uppercase;
}
.hero__eyebrow-line{width:36px;height:1px;background:var(--navy)}
.hero__title{
  font-weight:700;font-size:clamp(40px,7vw,92px);line-height:1.1;letter-spacing:-.02em;
  margin-bottom:28px;color:var(--ink);
}
.hero__title-line{display:block}
.hero__title-line--accent{
  color:var(--navy);
  font-style:normal;
}
.hero__title-line--gold{color:var(--gold)}
.hero__desc{
  max-width:760px;margin:0 auto 44px;color:var(--txt-dim);
  font-size:clamp(15px,1.4vw,17px);
}
.hero__actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-bottom:72px}

.hero__stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  border-top:1px solid var(--panel-line);border-bottom:1px solid var(--panel-line);
  padding:34px 0;background:#fff;
  border-radius:var(--radius);box-shadow:var(--shadow-sm);
}
.stat{position:relative;padding:0 22px}
.stat:not(:last-child)::after{
  content:"";position:absolute;right:0;top:12%;bottom:12%;width:1px;background:var(--line);
}
.stat__num{
  font-family:"Orbitron",monospace;font-weight:700;font-size:clamp(32px,3.8vw,52px);
  color:var(--navy);display:inline-block;
}
.stat__plus{font-family:"Orbitron",monospace;font-size:22px;color:var(--gold);vertical-align:top;margin-left:2px}
.stat__label{font-size:13px;color:var(--txt-dim);margin-top:6px;letter-spacing:.05em}

.hero__scroll{
  position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-family:"Orbitron",monospace;font-size:10px;letter-spacing:.3em;color:var(--txt-mut);
}
.hero__scroll-line{width:1px;height:54px;background:linear-gradient(180deg,var(--navy),transparent);
  animation:scrollDown 2s infinite}
@keyframes scrollDown{
  0%{transform:scaleY(0);transform-origin:top}
  50%{transform:scaleY(1);transform-origin:top}
  51%{transform:scaleY(1);transform-origin:bottom}
  100%{transform:scaleY(0);transform-origin:bottom}
}

/* ================= 业务核心条带（写字楼出租焦点） ================= */
.focus-band{
  background:var(--ink);color:#fff;
  padding:18px 6vw;
}
.focus-band__inner{
  max-width:1300px;margin:0 auto;
  display:flex;align-items:center;gap:32px;flex-wrap:wrap;justify-content:space-between;
}
.focus-band__txt{display:flex;align-items:center;gap:14px;font-size:14px;color:rgba(255,255,255,.85)}
.focus-band__txt b{color:var(--gold-soft);font-weight:600}
.focus-band__pill{
  display:inline-flex;align-items:center;gap:8px;padding:8px 18px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:30px;
  font-size:12px;letter-spacing:.08em;color:#fff;
}
.focus-band__pill .dot{width:6px;height:6px;border-radius:50%;background:var(--gold-soft);animation:pulse 2s infinite}

/* ================= 关于 ================= */
.about__grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:1300px;margin:0 auto;
}
.about__card{
  padding:34px 26px;transition:all .4s var(--ease);
  background:#fff;border:1px solid var(--panel-line);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);
}
.about__card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--navy)}
.about__icon{
  width:52px;height:52px;display:grid;place-items:center;margin-bottom:22px;
  background:var(--bg-2);border:1px solid var(--panel-line);border-radius:10px;color:var(--navy);
}
.about__card h3{font-size:18px;font-weight:700;margin-bottom:10px;color:var(--ink)}
.about__card p{font-size:14px;color:var(--txt-dim);line-height:1.7}

/* ================= 服务 ================= */
.services__list{max-width:1100px;margin:0 auto;display:grid;gap:14px}
.service{
  display:grid;grid-template-columns:80px 1fr 30px;align-items:center;gap:24px;
  padding:30px 34px;border-radius:var(--radius);
  background:#fff;border:1px solid var(--panel-line);
  box-shadow:var(--shadow-sm);
  transition:all .35s var(--ease);position:relative;overflow:hidden;
}
.service::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:var(--navy);
  transform:scaleY(0);transform-origin:top;transition:transform .35s var(--ease);
}
.service:hover{border-color:var(--navy);transform:translateX(6px);box-shadow:var(--shadow)}
.service:hover::before{transform:scaleY(1)}
.service__no{font-family:"Orbitron",monospace;font-size:18px;color:var(--gold);font-weight:700}
.service__body h3{font-size:19px;font-weight:700;margin-bottom:6px;color:var(--ink)}
.service__body p{font-size:14px;color:var(--txt-dim)}
.service__arrow{color:var(--navy);font-size:22px;transition:transform .35s var(--ease)}
.service:hover .service__arrow{transform:translateX(8px)}

/* ================= 楼宇（写字楼出租核心区块） ================= */
.props{
  display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1300px;margin:0 auto;
}
.prop{
  position:relative;border-radius:var(--radius);overflow:hidden;
  aspect-ratio:4/5;
  background:#fff;
  border:1px solid var(--panel-line);
  box-shadow:var(--shadow-sm);
  display:flex;flex-direction:column;justify-content:flex-end;
  padding:0;cursor:pointer;
  transition:all .45s var(--ease);
}
.prop::before{
  content:"";position:absolute;inset:0;z-index:2;
  background:linear-gradient(180deg,transparent 40%,rgba(13,27,42,.0) 60%,rgba(13,27,42,.5) 100%);
  opacity:1;transition:opacity .45s var(--ease);
  pointer-events:none;
}
.prop:hover{transform:translateY(-6px);border-color:var(--navy);box-shadow:var(--shadow-lg)}
.prop__img{
  position:absolute;inset:0;z-index:0;
  background-size:cover;background-position:center;background-repeat:no-repeat;
  background-color:var(--bg-2);
  filter:saturate(1) contrast(1);
  transition:transform .8s var(--ease),filter .5s var(--ease);
}
.prop:hover .prop__img{transform:scale(1.06);filter:saturate(1.1) brightness(1.02)}
.prop__overlay{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(255,255,255,0) 0%,rgba(255,255,255,0) 35%,rgba(13,27,42,.55) 75%,rgba(13,27,42,.9) 100%);
  transition:background .45s var(--ease);
}
.prop:hover .prop__overlay{
  background:linear-gradient(180deg,rgba(255,255,255,0) 0%,rgba(255,255,255,0) 35%,rgba(13,27,42,.65) 75%,rgba(13,27,42,.95) 100%);
}
.prop__no{
  position:absolute;top:20px;left:22px;z-index:3;
  font-family:"Orbitron",monospace;font-size:11px;color:#fff;letter-spacing:.2em;
  background:rgba(13,27,42,.6);padding:4px 10px;border-radius:3px;backdrop-filter:blur(6px);
}
.prop__id{
  position:absolute;top:20px;right:22px;z-index:3;
  font-family:"Orbitron",monospace;font-size:11px;color:rgba(255,255,255,.85);letter-spacing:.1em;
  background:rgba(13,27,42,.5);padding:4px 10px;border-radius:3px;backdrop-filter:blur(6px);
}
.prop__status{
  position:absolute;top:64px;left:22px;z-index:3;
  display:inline-flex;align-items:center;gap:6px;
  font-size:11px;letter-spacing:.08em;color:#fff;
  background:var(--gold);padding:4px 10px;border-radius:3px;font-weight:600;
}
.prop__status .dot{width:6px;height:6px;border-radius:50%;background:#fff;animation:pulse 2s infinite}
.prop__body{position:relative;z-index:3;padding:24px 22px 22px;color:#fff}
.prop__tag{
  display:inline-block;font-size:10px;letter-spacing:.15em;color:var(--gold-soft);
  padding:3px 10px;border:1px solid rgba(212,175,55,.5);border-radius:20px;
  background:rgba(13,27,42,.3);margin-bottom:10px;backdrop-filter:blur(6px);
}
.prop__name{font-size:21px;font-weight:700;margin-bottom:4px;letter-spacing:.02em;color:#fff}
.prop__loc{font-size:13px;color:rgba(255,255,255,.78);display:flex;align-items:center;gap:6px}
.prop__loc::before{content:"⌖";color:var(--gold-soft)}
.prop__line{
  height:1px;background:linear-gradient(90deg,var(--gold-soft),transparent);
  margin:14px 0;transform:scaleX(.6);transform-origin:left;transition:transform .5s var(--ease);
}
.prop:hover .prop__line{transform:scaleX(1)}
.prop__meta{
  display:flex;justify-content:space-between;font-size:12px;color:rgba(255,255,255,.7);
  margin-bottom:14px;
}
.prop__meta b{color:var(--gold-soft);font-family:"Orbitron",monospace;font-weight:600}
.prop__cta{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;color:#fff;font-weight:600;letter-spacing:.04em;
  padding:8px 0;border-bottom:1px solid rgba(255,255,255,.4);
  transition:all .3s var(--ease);
}
.prop__cta svg{transition:transform .3s var(--ease)}
.prop:hover .prop__cta{border-color:var(--gold-soft)}
.prop:hover .prop__cta svg{transform:translateX(4px)}

/* ================= 筛选 ================= */
.filter{
  display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:48px;
}
.filter__btn{
  padding:9px 22px;border-radius:30px;font-size:13px;color:var(--txt-dim);
  border:1px solid var(--panel-line);background:#fff;
  transition:all .3s var(--ease);font-weight:500;
}
.filter__btn:hover{color:var(--navy);border-color:var(--navy)}
.filter__btn.is-active{
  color:#fff;background:var(--navy);
  border-color:var(--navy);font-weight:600;
}

/* ================= 数据面板 ================= */
.panel__grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:0;
  max-width:1200px;margin:0 auto;padding:0;
  background:#fff;border:1px solid var(--panel-line);border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.panel__item{
  padding:34px 30px;text-align:center;position:relative;
}
.panel__item:not(:last-child)::after{
  content:"";position:absolute;right:0;top:20%;bottom:20%;width:1px;background:var(--line);
}
.panel__label{font-size:13px;color:var(--txt-dim);margin-bottom:14px}
.panel__value{
  font-family:"Orbitron",monospace;font-weight:700;font-size:clamp(30px,3.2vw,44px);
  color:var(--navy);
}
.panel__value span{font-size:14px;color:var(--txt-dim);margin-left:4px;font-weight:400}
.panel__trend{font-size:12px;margin-top:10px;font-family:"Orbitron",monospace}
.panel__trend--up{color:#1a7a4a}
.panel__trend--down{color:#c0392b}

/* ================= 联系 ================= */
.contact__wrap{
  max-width:1180px;margin:0 auto;padding:60px;
  display:grid;grid-template-columns:1.1fr 1fr;gap:60px;align-items:center;
  background:#fff;border:1px solid var(--panel-line);border-radius:var(--radius);box-shadow:var(--shadow);
}
.contact__title{margin-bottom:18px;text-align:left}
.contact__desc{color:var(--txt-dim);margin-bottom:36px}
.contact__list{list-style:none;display:flex;flex-direction:column;gap:22px}
.contact__list li{display:flex;gap:18px;align-items:center}
.contact__ico{
  width:48px;height:48px;display:grid;place-items:center;flex-shrink:0;
  border:1px solid var(--panel-line);border-radius:10px;
  background:var(--bg-2);color:var(--navy);font-size:18px;
}
.contact__k{font-size:12px;color:var(--txt-mut);letter-spacing:.1em;margin-bottom:2px}
.contact__v{font-size:18px;font-weight:500;color:var(--ink);font-family:"Orbitron",monospace}
.contact__v:hover{color:var(--navy)}

.contact__form{display:flex;flex-direction:column;gap:18px}
.field{display:flex;flex-direction:column;gap:8px}
.field label{font-size:12px;color:var(--txt-dim);letter-spacing:.1em}
.field input{
  padding:14px 16px;border-radius:8px;background:var(--bg-2);
  border:1px solid var(--panel-line);color:var(--txt);font-size:14px;
  transition:all .3s var(--ease);
}
.field input::placeholder{color:var(--txt-mut)}
.field input:focus{outline:none;border-color:var(--navy);background:#fff;
  box-shadow:0 0 0 3px rgba(10,61,98,.08)}
.contact__hint{font-size:13px;color:var(--navy);min-height:18px;text-align:center}

/* ================= 页脚 ================= */
.footer{border-top:1px solid var(--panel-line);margin-top:80px;padding:60px 6vw 0;
  background:var(--bg-2)}
.footer__inner{
  max-width:1300px;margin:0 auto;display:flex;justify-content:space-between;
  align-items:center;gap:30px;flex-wrap:wrap;padding-bottom:40px;
}
.footer__logo{font-family:"Orbitron",monospace;font-size:14px;color:var(--navy);letter-spacing:.15em;font-weight:700}
.footer__slogan{font-size:13px;color:var(--txt-dim);margin-top:6px}
.footer__nav{display:flex;gap:24px}
.footer__nav a{font-size:13px;color:var(--txt-dim)}
.footer__nav a:hover{color:var(--navy)}
.footer__contact{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--txt-dim)}
.footer__contact span{font-family:"Orbitron",monospace}
.footer__copy{
  text-align:center;padding:22px 0;font-size:12px;color:var(--txt-mut);
  border-top:1px solid var(--line);letter-spacing:.05em;
}

/* ================= 返回顶部 ================= */
.totop{
  position:fixed;right:24px;bottom:24px;z-index:80;
  width:48px;height:48px;border-radius:50%;
  background:var(--navy);
  color:#fff;display:grid;place-items:center;font-size:20px;font-weight:700;
  box-shadow:0 10px 30px -10px rgba(10,61,98,.6);
  opacity:0;visibility:hidden;transform:translateY(20px);
  transition:all .35s var(--ease);
}
.totop.is-show{opacity:1;visibility:visible;transform:translateY(0)}
.totop:hover{transform:translateY(-3px);background:var(--navy-2)}

/* ================= 滚动入场动画 ================= */
.reveal{opacity:0;transform:translateY(36px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ================= 响应式 ================= */
@media(max-width:1024px){
  .nav__links{display:none}
  .nav__burger{display:flex}
  .nav__cta{display:none}
  .about__grid,.props{grid-template-columns:repeat(2,1fr)}
  .panel__grid{grid-template-columns:repeat(2,1fr)}
  .panel__item:nth-child(2)::after{display:none}
  .contact__wrap{grid-template-columns:1fr;padding:44px 30px;gap:40px}
  .focus-band__inner{justify-content:center;text-align:center}
}
@media(max-width:640px){
  .section{padding:80px 5vw}
  .hero{padding:120px 5vw 80px;min-height:auto}
  .hero__stats{grid-template-columns:repeat(2,1fr);gap:30px 0}
  .stat:not(:last-child)::after{display:none}
  .stat:nth-child(odd)::after{display:block;right:0;top:12%;bottom:12%;width:1px;background:var(--line)}
  .about__grid,.props{grid-template-columns:1fr}
  .panel__grid{grid-template-columns:1fr}
  .panel__item::after{display:none !important}
  .panel__item{border-bottom:1px solid var(--line)}
  .service{grid-template-columns:50px 1fr 20px;padding:22px;gap:16px}
  .contact__wrap{padding:34px 20px}
  .footer__inner{flex-direction:column;text-align:center}
  .focus-band__txt{font-size:13px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
}