/* ═══════════════════════════════════════════════════
   ZTJ 智同杰检测 — Tesla-Inspired Design System
   Colors: #171a20 (dark bg) · #22262c (card dark) · #f4f4f4 (light bg)
           #e8e8e8 (gray section) · #3e6ae1 (accent) · #fff
   Font:   "Noto Sans SC", system-ui, sans-serif
   ═══════════════════════════════════════════════════ */

/* ── RESET ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:"Noto Sans SC",system-ui,-apple-system,sans-serif;
  color:#171a20;background:#fff;
  line-height:1.7;letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* ── UTILITIES ── */
.container{max-width:1200px;margin:0 auto;padding:0 40px}
@media(max-width:768px){.container{padding:0 20px}}

/* ── BUTTONS ── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 32px;border-radius:4px;font-size:14px;font-weight:500;
  letter-spacing:.04em;cursor:pointer;border:none;
  transition:all .3s cubic-bezier(.4,0,.2,1);
  white-space:nowrap;
}
.btn--dark{background:#171a20;color:#fff}
.btn--dark:hover{background:#2a2e36}
.btn--white{background:#fff;color:#171a20}
.btn--white:hover{background:rgba(255,255,255,.9)}
.btn--outline{border:1.5px solid rgba(255,255,255,.6);color:#fff;background:transparent}
.btn--outline:hover{background:rgba(255,255,255,.1)}
.btn--outline-white{border:1.5px solid rgba(255,255,255,.6);color:#fff;background:transparent}
.btn--outline-white:hover{background:rgba(255,255,255,.12)}
.btn--outline-dark{border:1.5px solid #171a20;color:#171a20;background:transparent}
.btn--outline-dark:hover{background:#171a20;color:#fff}
.btn--sm{padding:8px 24px;font-size:13px}
.btn--full{width:100%}

/* ═══════════════════ NAV ═══════════════════ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(23,26,32,.85);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  transition:background .4s;
}
.nav.scrolled{background:rgba(23,26,32,.96)}
.nav__inner{
  max-width:1200px;margin:0 auto;padding:0 40px;
  display:flex;align-items:center;justify-content:space-between;
  height:60px;
}
.nav__logo{display:flex;align-items:center;gap:8px}
.nav__logo-en{font-size:18px;font-weight:700;color:#fff;letter-spacing:.06em}
.nav__logo-zh{font-size:12px;font-weight:300;color:rgba(255,255,255,.6);margin-left:2px}
.nav__menu{display:flex;gap:32px}
.nav__menu a{
  font-size:13px;font-weight:400;color:rgba(255,255,255,.75);
  letter-spacing:.04em;transition:color .25s;position:relative;
}
.nav__menu a::after{
  content:'';position:absolute;bottom:-4px;left:0;width:0;height:1px;
  background:#fff;transition:width .3s;
}
.nav__menu a.nav__link--active{color:#fff;font-weight:500}
.nav__menu a.nav__link--active::after{width:100%}
.nav__menu a:hover{color:#fff}
.nav__menu a:hover::after{width:100%}
.nav__actions{display:flex;align-items:center;gap:16px}
.nav__hamburger{
  display:none;flex-direction:column;gap:5px;
  background:none;border:none;cursor:pointer;padding:4px;
}
.nav__hamburger span{display:block;width:20px;height:1.5px;background:#fff;transition:.3s}

@media(max-width:900px){
  .nav__menu{
    position:fixed;top:60px;left:0;right:0;bottom:0;
    background:rgba(23,26,32,.98);flex-direction:column;
    align-items:center;justify-content:center;gap:28px;
    transform:translateX(100%);transition:transform .4s cubic-bezier(.4,0,.2,1);
  }
  .nav__menu.open{transform:translateX(0)}
  .nav__menu a{font-size:18px;color:rgba(255,255,255,.85)}
  .nav__hamburger{display:flex}
}

/* ═══════════════════ HERO ═══════════════════ */
.hero{
  position:relative;height:100vh;min-height:600px;
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.hero__slides{position:absolute;inset:0}
.hero__slide{
  position:absolute;inset:0;
  background-size:cover;background-position:center;
  opacity:0;transition:opacity 1.2s cubic-bezier(.4,0,.2,1);
}
.hero__slide--active{opacity:1}
.hero__overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.45) 0%,rgba(0,0,0,.6) 100%)}
.hero__content{
  position:relative;z-index:2;text-align:center;
  padding:0 24px;max-width:800px;
}
.hero__tag{
  font-size:12px;font-weight:400;letter-spacing:.2em;
  color:rgba(255,255,255,.65);text-transform:uppercase;
  margin-bottom:20px;
}
.hero__title{
  font-size:clamp(32px,5.5vw,56px);font-weight:600;
  color:#fff;line-height:1.2;letter-spacing:.08em;
  margin-bottom:16px;white-space:nowrap;
}
@media(max-width:600px){.hero__title{white-space:normal;font-size:clamp(24px,7vw,36px)}}
.hero__sub{
  font-size:clamp(14px,1.6vw,18px);font-weight:300;
  color:rgba(255,255,255,.7);line-height:1.6;
  margin-bottom:40px;
}
.hero__cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero__indicators{
  position:absolute;bottom:100px;left:50%;transform:translateX(-50%);
  z-index:2;display:flex;gap:10px;
}
.hero__dot{
  width:8px;height:8px;border-radius:50%;border:1.5px solid rgba(255,255,255,.5);
  background:transparent;cursor:pointer;transition:.3s;padding:0;
}
.hero__dot--active{background:#fff;border-color:#fff}
.hero__scroll{
  position:absolute;bottom:36px;left:50%;transform:translateX(-50%);
  z-index:2;display:flex;flex-direction:column;align-items:center;gap:4px;
  color:rgba(255,255,255,.5);font-size:11px;letter-spacing:.1em;
  animation:float 2.5s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateX(-50%) translateY(0)}50%{transform:translateX(-50%) translateY(8px)}}

/* ═══════════════════ SECTIONS ═══════════════════ */
.section{padding:120px 0}
.section--dark{background:#171a20;color:#fff}
.section--light{background:#f4f4f4;color:#171a20}
.section--gray{background:#e8e8e8;color:#171a20}

.section__header{margin-bottom:64px}
.section__header--split{display:flex;align-items:flex-start;justify-content:space-between;flex-wrap:wrap;gap:20px}
.section__header--split .section__title{margin-bottom:0}
.section__tag{
  display:inline-block;font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;
  opacity:.45;margin-bottom:12px;
}
.section--dark .section__tag{color:rgba(255,255,255,.5)}
.section__title{
  font-size:clamp(28px,3.5vw,42px);font-weight:600;
  line-height:1.25;letter-spacing:.02em;
}
.section__desc{
  font-size:15px;font-weight:300;opacity:.6;
  margin-top:12px;max-width:480px;line-height:1.7;
}

@media(max-width:768px){.section{padding:80px 0}.section__header{margin-bottom:40px}}

/* ═══════════════════ ABOUT ═══════════════════ */
.about__grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
.about__lead{
  font-size:17px;font-weight:400;line-height:1.9;
  color:rgba(255,255,255,.85);margin-bottom:20px;
}
.about__text p{font-size:15px;color:rgba(255,255,255,.55);line-height:1.9}
.about__stats{display:flex;gap:40px;margin-top:40px;padding-top:32px;border-top:1px solid rgba(255,255,255,.1)}
.stat__num{display:block;font-size:28px;font-weight:600;color:#fff;letter-spacing:.04em}
.stat__label{font-size:12px;color:rgba(255,255,255,.45);letter-spacing:.06em}
.about__visual{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.about__card{
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);
  border-radius:12px;padding:28px 24px;
  transition:all .35s cubic-bezier(.4,0,.2,1);
}
.about__card:hover{background:rgba(255,255,255,.1);transform:translateY(-4px)}
.about__card-icon{color:rgba(255,255,255,.5);margin-bottom:16px}
.about__card h4{font-size:15px;font-weight:500;color:#fff;margin-bottom:8px}
.about__card p{font-size:13px;color:rgba(255,255,255,.45);line-height:1.7}

@media(max-width:900px){
  .about__grid{grid-template-columns:1fr;gap:48px}
  .about__visual{grid-template-columns:1fr 1fr}
}

/* ═══════════════════ SERVICES ═══════════════════ */
.services__hero-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
  margin-bottom:20px;
}
.service-card{border-radius:16px;overflow:hidden;position:relative}
.service-card--featured{
  height:480px;display:flex;align-items:flex-end;
  cursor:pointer;
}
.service-card--featured .service-card__bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  transition:transform .8s cubic-bezier(.4,0,.2,1);
}
.service-card--featured:hover .service-card__bg{transform:scale(1.06)}
.service-card--featured::before{
  content:'';position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,transparent 30%,rgba(0,0,0,.75) 100%);
}
.service-card--featured .service-card__content{
  position:relative;z-index:2;padding:36px;color:#fff;
}
.service-card__tag{
  font-size:11px;font-weight:500;letter-spacing:.15em;
  text-transform:uppercase;opacity:.6;margin-bottom:8px;display:block;
}
.service-card__content h3{
  font-size:22px;font-weight:600;margin-bottom:4px;line-height:1.3;
}
.service-card__std{
  font-size:13px;opacity:.55;font-weight:400;margin-bottom:12px;
}
.service-card__content p{font-size:13px;opacity:.7;line-height:1.7;margin-bottom:20px}

.services__grid{
  display:grid;grid-template-columns:repeat(6,1fr);gap:16px;
}
.service-card--compact{
  background:#fff;border-radius:12px;padding:28px 20px;
  text-align:center;border:1px solid rgba(0,0,0,.06);
  transition:all .3s;cursor:pointer;
}
.service-card--compact:hover{
  transform:translateY(-4px);box-shadow:0 12px 40px rgba(0,0,0,.08);
}
.service-card__icon{
  display:flex;justify-content:center;
  color:#171a20;opacity:.5;margin-bottom:16px;
}
.service-card--compact h4{font-size:14px;font-weight:500;margin-bottom:4px}
.service-card--compact p{font-size:12px;color:#999}

@media(max-width:900px){
  .services__hero-grid{grid-template-columns:1fr}
  .service-card--featured{height:360px}
  .services__grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:600px){
  .services__grid{grid-template-columns:repeat(2,1fr)}
}

/* ═══════════════════ NEWS ═══════════════════ */
.tab-group{display:flex;gap:4px;background:rgba(255,255,255,.08);border-radius:8px;padding:4px}
.tab{
  padding:8px 20px;border:none;background:transparent;
  color:rgba(255,255,255,.5);font-size:13px;font-weight:500;
  border-radius:6px;cursor:pointer;transition:.25s;
  font-family:inherit;letter-spacing:.02em;
}
.tab--active{background:rgba(255,255,255,.12);color:#fff}
.tab:hover:not(.tab--active){color:rgba(255,255,255,.7)}

.news__list{display:flex;flex-direction:column}
.news-item{
  display:flex;align-items:center;gap:24px;
  padding:28px 0;border-bottom:1px solid rgba(255,255,255,.08);
  transition:all .3s;cursor:pointer;
}
.section--dark .news-item{border-color:rgba(255,255,255,.08)}
.news-item:hover{padding-left:12px}
.news-item__date{
  flex-shrink:0;width:64px;font-size:12px;font-weight:500;
  color:rgba(255,255,255,.35);letter-spacing:.04em;
}
.news-item__body{flex:1}
.news-item__body h4{font-size:16px;font-weight:500;color:#fff;margin-bottom:6px;line-height:1.4}
.news-item__body p{font-size:13px;color:rgba(255,255,255,.4);line-height:1.6}
.news-item__arrow{
  flex-shrink:0;font-size:20px;color:rgba(255,255,255,.25);
  transition:all .3s;
}
.news-item:hover .news-item__arrow{color:#fff;transform:translateX(4px)}

/* ═══════════════════ NOTICE ═══════════════════ */
.notice__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.notice-card{
  background:#fff;border-radius:12px;padding:32px;
  border:1px solid rgba(0,0,0,.05);
  transition:all .35s;cursor:pointer;
  display:block;text-decoration:none;color:inherit;
}
.notice-card:hover{transform:translateY(-4px);box-shadow:0 16px 48px rgba(0,0,0,.08)}
.notice-card__badge{
  display:inline-block;font-size:11px;font-weight:600;
  letter-spacing:.08em;padding:4px 12px;border-radius:4px;
  background:#171a20;color:#fff;margin-bottom:16px;
}
.notice-card__badge--warn{background:#c0392b}
.notice-card h4{font-size:16px;font-weight:500;line-height:1.5;margin-bottom:8px}
.notice-card p{font-size:13px;color:#888;line-height:1.7;margin-bottom:16px}
.notice-card__date{font-size:12px;color:#bbb;letter-spacing:.04em}

@media(max-width:768px){.notice__grid{grid-template-columns:1fr}}

/* ═══════════════════ QUERY ═══════════════════ */
.query__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:32px}
.query-card{
  background:#fff;border-radius:16px;padding:48px 40px;
  border:1px solid rgba(0,0,0,.06);
  text-align:center;
  transition:all .35s;
}
.query-card:hover{box-shadow:0 20px 60px rgba(0,0,0,.08)}
.query-card__icon{
  display:flex;justify-content:center;margin-bottom:24px;color:#171a20;opacity:.6;
}
.query-card h3{font-size:20px;font-weight:600;margin-bottom:32px}
.query-form{text-align:left}
.form-group{margin-bottom:20px}
.form-group label{
  display:block;font-size:12px;font-weight:500;
  letter-spacing:.06em;color:#999;margin-bottom:8px;
}
.form-group input{
  width:100%;padding:14px 16px;border:1px solid #e0e0e0;
  border-radius:8px;font-size:14px;font-family:inherit;
  background:#fafafa;transition:all .25s;
  outline:none;
}
.form-group input:focus{border-color:#171a20;background:#fff}
.form-group input::placeholder{color:#ccc}

@media(max-width:768px){
  .query__grid{grid-template-columns:1fr}
  .query-card{padding:36px 28px}
}

/* ═══════════════════ OFFICE ═══════════════════ */
.office__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.office-card{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);
  border-radius:16px;padding:48px 32px;text-align:center;
  transition:all .35s;display:block;cursor:pointer;
  color:#fff;
}
.office-card:hover{background:rgba(255,255,255,.1);transform:translateY(-4px)}
.office-card svg{margin:0 auto 20px;opacity:.5}
.office-card h4{font-size:18px;font-weight:500;margin-bottom:8px}
.office-card p{font-size:13px;opacity:.45}

@media(max-width:768px){.office__grid{grid-template-columns:1fr}}

/* ═══════════════════ CAREERS (hidden) ═══════════════════ */
#careers{display:none!important}
.careers__list{display:flex;flex-direction:column}
.career-item{
  display:flex;align-items:center;justify-content:space-between;
  padding:28px 0;border-bottom:1px solid rgba(0,0,0,.08);
  transition:all .3s;
}
.career-item:hover{padding-left:8px}
.career-item__info h4{font-size:16px;font-weight:500;margin-bottom:4px}
.career-item__info span{font-size:13px;color:#999}

/* ═══════════════════ FOOTER ═══════════════════ */
.footer{
  background:#171a20;color:rgba(255,255,255,.5);
  padding:80px 0 40px;
}
.footer__grid{
  display:grid;grid-template-columns:2fr 1fr 1fr;gap:48px;
  margin-bottom:48px;padding-bottom:48px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.footer__logo{
  font-size:20px;font-weight:700;color:#fff;
  letter-spacing:.06em;display:block;margin-bottom:16px;
}
.footer__brand p{font-size:13px;line-height:1.8}
.footer__contact{margin-top:16px}
.footer__links h5{
  font-size:12px;font-weight:600;color:rgba(255,255,255,.3);
  letter-spacing:.12em;text-transform:uppercase;margin-bottom:20px;
}
.footer__links a{
  display:block;font-size:13px;color:rgba(255,255,255,.5);
  padding:6px 0;transition:color .25s;
}
.footer__links a:hover{color:#fff}
.footer__bottom{
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;
  font-size:12px;
}

@media(max-width:768px){
  .footer__grid{grid-template-columns:1fr;gap:36px}
  .footer__bottom{flex-direction:column;text-align:center}
}

/* ═══════════════════ ANIMATIONS ═══════════════════ */
.fade-up{opacity:0;transform:translateY(30px);transition:all .7s cubic-bezier(.4,0,.2,1)}
.fade-up.visible{opacity:1;transform:translateY(0)}