:root{
  --lime:#c6f24e;
  --lime-glow:rgba(198,242,78,.55);
  --ink:#0d0f0c;
  --muted:#8b9285;
  --line:rgba(0,0,0,.08);
  --radius:18px;
  --max:1320px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter','Manrope',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  color:var(--ink);
  background:#f4f5f1;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}

/* ---------- NAV ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:18px clamp(20px,4vw,54px);
  transition:background .35s,backdrop-filter .35s,box-shadow .35s;
}
.nav.scrolled{
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(14px);
  box-shadow:0 6px 30px rgba(0,0,0,.06);
}
.brand{
  display:flex;align-items:center;gap:8px;
  background:var(--lime);color:#0d0f0c;
  padding:9px 18px 9px 14px;border-radius:999px;
  font-weight:800;font-size:18px;letter-spacing:.3px;
  box-shadow:0 6px 20px var(--lime-glow);
}
.brand__icon{width:24px;height:24px;display:block;flex:0 0 auto}
.brand__name{line-height:1}
.nav__links{display:flex;gap:36px}
.nav__links a{
  font-size:15px;font-weight:500;color:#f3f5ee;
  text-shadow:0 1px 8px rgba(0,0,0,.35);
  transition:color .2s,opacity .2s;position:relative;
}
.nav.scrolled .nav__links a{color:#3a3f36;text-shadow:none}
.nav__links a:hover{opacity:.7}
.nav__cta{
  border:1.5px solid rgba(255,255,255,.7);color:#fff;
  padding:9px 20px;border-radius:999px;font-size:14px;font-weight:600;
  backdrop-filter:blur(6px);transition:.25s;
}
.nav.scrolled .nav__cta{border-color:var(--ink);color:var(--ink)}
.nav__cta:hover{background:var(--lime);border-color:var(--lime);color:#0d0f0c}
.nav__burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__burger span{width:24px;height:2px;background:#fff;border-radius:2px;transition:.3s}
.nav.scrolled .nav__burger span{background:var(--ink)}

/* ---------- HERO ---------- */
/* 高度按 16:9 视频比例自适应：宽度撑满，视频完整显示、无裁剪、无黑边 */
.hero{position:relative;width:100%;aspect-ratio:16/9;overflow:hidden;display:flex;flex-direction:column;justify-content:center}
.hero__sky{position:absolute;inset:0;z-index:0;
  background:linear-gradient(180deg,#2c3f52 0%,#5e7387 22%,#93a2ad 45%,#c3c3bd 70%,#8a9d7e 100%);
}
.hero__video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}
.hero__scrim{position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.28) 0%,rgba(0,0,0,.12) 40%,rgba(0,0,0,.35) 100%);
}
.sky__sun{
  position:absolute;top:30%;right:12%;width:340px;height:340px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,241,200,.95) 0%,rgba(255,214,140,.4) 40%,transparent 70%);
  filter:blur(6px);
}
.sky__cloud{position:absolute;border-radius:50%;filter:blur(28px);opacity:.85}
.sky__cloud--1{width:60vw;height:280px;top:8%;left:-10%;background:radial-gradient(ellipse,#fdfdfb,transparent 70%);animation:drift 60s linear infinite}
.sky__cloud--2{width:45vw;height:220px;top:22%;right:-8%;background:radial-gradient(ellipse,#e9ede8,transparent 70%);animation:drift 80s linear infinite reverse}
.sky__cloud--3{width:70vw;height:300px;bottom:22%;left:-5%;background:radial-gradient(ellipse,#f4f2ea,transparent 72%);animation:drift 100s linear infinite}
@keyframes drift{from{transform:translateX(0)}to{transform:translateX(60px)}}
.sky__hill{
  position:absolute;left:0;right:0;bottom:0;height:34%;
  background:linear-gradient(180deg,rgba(90,110,70,.2),rgba(60,78,48,.85));
  clip-path:polygon(0 55%,22% 30%,40% 42%,62% 22%,100% 48%,100% 100%,0 100%);
}

.hero__content{position:relative;z-index:2;padding:0 clamp(20px,6vw,90px);margin-top:-4vh}
.hero__title{display:flex;flex-direction:column;line-height:.92;font-family:'Manrope',sans-serif}
.hero__title-main{
  font-size:clamp(52px,11vw,150px);font-weight:800;letter-spacing:-1px;
  color:var(--lime);text-shadow:0 0 40px var(--lime-glow);
  display:inline-flex;align-items:flex-start;gap:.1em;
}
.hero__sparkle{font-size:.4em;color:var(--lime);filter:drop-shadow(0 0 10px var(--lime-glow));animation:twinkle 2.5s ease-in-out infinite}
@keyframes twinkle{0%,100%{opacity:.5;transform:scale(.9)}50%{opacity:1;transform:scale(1.15)}}
.hero__title-sub{
  font-size:clamp(38px,8.5vw,118px);font-weight:800;letter-spacing:1px;color:#fff;
  text-shadow:0 4px 30px rgba(0,0,0,.35);display:inline-flex;align-items:flex-end;gap:.25em;
}
.hero__script{font-family:'Dancing Script',cursive;font-size:.32em;color:var(--lime);font-weight:600;margin-bottom:.6em;text-shadow:0 0 14px var(--lime-glow)}
.hero__lede{
  margin-top:26px;color:rgba(255,255,255,.92);font-size:clamp(15px,1.7vw,20px);
  font-weight:500;line-height:1.7;text-shadow:0 2px 14px rgba(0,0,0,.4);
}

.hero__play{
  position:absolute;z-index:3;top:52%;left:50%;transform:translate(-50%,-50%);
  width:78px;height:78px;border-radius:50%;border:0;cursor:pointer;color:#0d0f0c;
  background:rgba(255,255,255,.9);display:grid;place-items:center;
  box-shadow:0 10px 40px rgba(0,0,0,.3);transition:transform .25s,background .25s;
}
.hero__play::before{content:"";position:absolute;inset:-10px;border-radius:50%;border:2px solid rgba(255,255,255,.5);animation:pulse 2.2s ease-out infinite}
@keyframes pulse{0%{transform:scale(1);opacity:.7}100%{transform:scale(1.5);opacity:0}}
.hero__play:hover{transform:translate(-50%,-50%) scale(1.08);background:var(--lime)}

/* ---------- CAROUSEL ---------- */
.carousel{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:0 0 14px;-webkit-mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent)}
.carousel__track{display:flex;gap:16px;padding:0 24px;width:max-content;animation:slide 40s linear infinite}
.carousel:hover .carousel__track{animation-play-state:paused}
@keyframes slide{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.card{
  position:relative;flex:0 0 auto;width:172px;height:150px;border-radius:14px;overflow:hidden;
  box-shadow:0 12px 34px rgba(0,0,0,.35);cursor:pointer;transition:transform .3s;
}
.card:hover{transform:translateY(-8px) scale(1.02)}
.card__bg{position:absolute;inset:0;display:grid;place-items:center;font-size:44px}
.card__label{position:absolute;left:10px;bottom:8px;color:#fff;font-size:11px;font-weight:700;letter-spacing:1px;text-shadow:0 2px 6px rgba(0,0,0,.6)}
.card__num{position:absolute;right:10px;top:8px;color:rgba(255,255,255,.85);font-size:11px;font-weight:700}

/* ---------- SECTIONS ---------- */
.section{max-width:var(--max);margin:0 auto;padding:clamp(70px,10vw,130px) clamp(20px,5vw,40px)}
.section--dark{background:var(--ink);color:#f2f4ee;max-width:none}
.section--dark .section{padding-top:0;padding-bottom:0}
.section__head{margin-bottom:52px}
.section__head p{margin-top:14px;font-size:16px;color:#5c6157;max-width:560px}
.section--dark .section__head p{color:#9aa090}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;letter-spacing:2px;text-transform:uppercase;color:#7c9a3a;margin-bottom:14px}
.section--dark .eyebrow,.contact .eyebrow{color:var(--lime)}
.section__head h2,.contact h2{font-family:'Manrope',sans-serif;font-size:clamp(32px,5vw,56px);font-weight:800;letter-spacing:-1px}

/* timeline */
.timeline{list-style:none;position:relative;padding-left:26px}
.timeline::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--lime),transparent)}
.timeline li{position:relative;padding:0 0 40px 26px}
.timeline li::before{content:"";position:absolute;left:-24px;top:4px;width:14px;height:14px;border-radius:50%;background:var(--lime);box-shadow:0 0 0 4px rgba(198,242,78,.25)}
.timeline .t-date{font-size:13px;font-weight:600;color:var(--muted);letter-spacing:1px}
.timeline .t-role{font-size:21px;font-weight:700;margin:4px 0 2px}
.timeline .t-org{font-size:15px;color:#7c9a3a;font-weight:600;margin-bottom:8px}
.timeline .t-desc{font-size:15px;color:#5c6157;line-height:1.7;max-width:640px}

/* works grid */
.works-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:20px}
.work{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/5;cursor:pointer}
.work__bg{position:absolute;inset:0;display:grid;place-items:center;font-size:70px;transition:transform .5s}
.work:hover .work__bg{transform:scale(1.08)}
.work__overlay{position:absolute;inset:0;background:linear-gradient(transparent 40%,rgba(0,0,0,.8));display:flex;flex-direction:column;justify-content:flex-end;padding:20px;opacity:.9;transition:.3s}
.work__cat{font-size:12px;letter-spacing:1.5px;text-transform:uppercase;color:var(--lime);font-weight:700}
.work__name{font-size:20px;font-weight:700;color:#fff;margin-top:4px}

/* strengths */
.strengths{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:22px}
.scard{border:1px solid var(--line);border-radius:var(--radius);padding:34px 28px;background:#fff;transition:transform .3s,box-shadow .3s}
.scard:hover{transform:translateY(-6px);box-shadow:0 20px 50px rgba(0,0,0,.08)}
.scard__ico{width:54px;height:54px;border-radius:14px;background:var(--lime);display:grid;place-items:center;font-size:26px;margin-bottom:18px;box-shadow:0 8px 22px var(--lime-glow)}
.scard h3{font-size:20px;font-weight:700;margin-bottom:10px}
.scard p{font-size:15px;color:#5c6157;line-height:1.7}

/* contact */
.contact{background:var(--ink);color:#f2f4ee;text-align:center;padding:clamp(80px,12vw,150px) 20px 50px}
.contact h2{margin-top:6px}
.contact .hl{background:linear-gradient(90deg,#fff,var(--lime));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.contact>p{color:#9aa090;margin-top:16px;font-size:17px}
.contact__actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin:38px 0 50px}
.btn{padding:14px 30px;border-radius:999px;font-size:15px;font-weight:600;transition:.25s;border:1px solid transparent}
.btn--primary{background:var(--lime);color:#0d0f0c;box-shadow:0 10px 30px var(--lime-glow)}
.btn--primary:hover{transform:translateY(-3px)}
.btn--ghost{border-color:rgba(255,255,255,.22);color:#f2f4ee}
.btn--ghost:hover{background:rgba(255,255,255,.08)}
.footer{color:#5b6156;font-size:13px;letter-spacing:.5px}
.footer p{margin:4px 0}
.footer__beian a{color:inherit;text-decoration:none;opacity:.8;transition:opacity .2s}
.footer__beian a:hover{opacity:1;text-decoration:underline}

/* reveal anim */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* modal */
.modal{position:fixed;inset:0;z-index:100;background:rgba(6,8,6,.9);display:grid;place-items:center;padding:20px;backdrop-filter:blur(8px)}
.modal[hidden]{display:none}
.modal__box{width:min(900px,92vw);aspect-ratio:16/9;border-radius:16px;overflow:hidden;background:#111;display:grid;place-items:center}
.modal__placeholder{color:#c6f24e;text-align:center;font-size:40px;font-weight:700;line-height:1.5}
.modal__close{position:absolute;top:22px;right:26px;width:44px;height:44px;border-radius:50%;border:0;background:rgba(255,255,255,.12);color:#fff;font-size:18px;cursor:pointer;transition:.2s}
.modal__close:hover{background:var(--lime);color:#0d0f0c}

/* ---------- RESPONSIVE ---------- */
@media(max-width:820px){
  .nav__links,.nav__cta{display:none}
  .nav__burger{display:flex}
  .nav__links.open{
    display:flex;flex-direction:column;gap:22px;position:absolute;top:100%;left:0;right:0;
    background:rgba(13,15,12,.96);padding:28px 30px;backdrop-filter:blur(14px);
  }
  .nav__links.open a{color:#f3f5ee;text-shadow:none;font-size:18px}
  .hero__play{width:64px;height:64px;top:46%}
  .card{width:140px;height:124px}
  /* 窄屏下 16:9 太矮放不下大标题：放开比例，用最小高度兜底，视频回到填满模式 */
  .hero{aspect-ratio:auto;min-height:88vh}
  .hero__video{object-fit:cover}
}