/* ===== WhalTide Deep-Sea Tech Visual System ===== */
:root{
  --bg:#0A1929; --bg-2:#0D1F35;
  --surface:rgba(255,255,255,.04); --surface-2:rgba(255,255,255,.06);
  --border:rgba(255,255,255,.08); --border-2:rgba(255,255,255,.14);
  --text:#E8F4F8; --text-2:#9DB2C7; --text-3:#5A7A99;
  --cyan:#06B6D4; --cyan-2:#0EA5E9; --mint:#2DD4BF; --mint-2:#14B8A6;
  --accent:#F59E0B; --glow:rgba(6,182,212,.35);
  --r-sm:8px; --r:16px; --r-lg:24px; --r-xl:32px;
  --shadow:0 8px 32px rgba(0,0,0,.4);
  --fw-head:'Space Grotesk',sans-serif; --fw-body:'DM Sans','Noto Sans SC',sans-serif;
  --max:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:var(--fw-body);background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:var(--fw-head);line-height:1.2;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 24px}
.grad-text{background:linear-gradient(135deg,var(--cyan),var(--mint));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--mint);margin-right:8px;box-shadow:0 0 8px var(--mint)}

.bg-layer{position:fixed;inset:0;z-index:-1;overflow:hidden}
.bg-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(6,182,212,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(6,182,212,.03) 1px,transparent 1px);background-size:60px 60px;mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 0%,transparent 70%)}
.bg-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5}
.bg-orb--1{width:600px;height:600px;background:radial-gradient(circle,rgba(6,182,212,.25),transparent 70%);top:-200px;right:-100px;animation:float 20s ease-in-out infinite}
.bg-orb--2{width:500px;height:500px;background:radial-gradient(circle,rgba(45,212,191,.18),transparent 70%);bottom:-150px;left:-100px;animation:float 25s ease-in-out infinite reverse}
@keyframes float{0%,100%{transform:translate(0,0)}50%{transform:translate(40px,30px)}}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:all .3s}
.nav.scrolled{background:rgba(10,25,41,.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}
.nav__inner{max-width:var(--max);margin:0 auto;padding:0 24px;height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.nav__logo{display:flex;align-items:center;gap:10px;font-family:var(--fw-head);font-weight:700;font-size:1.1rem}
.nav__logo-mark{flex-shrink:0}
.nav__logo-text{display:flex;flex-direction:column;line-height:1.1}
.nav__logo-en{font-size:.7rem;color:var(--text-3);font-weight:500;letter-spacing:.1em}
.nav__links{display:flex;align-items:center;gap:8px}
.nav__link{padding:8px 14px;border-radius:var(--r-sm);color:var(--text-2);font-size:.92rem;font-weight:500;transition:all .2s}
.nav__link:hover{color:var(--text);background:var(--surface)}
.nav__cta{margin-left:8px}
.nav__burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav__burger span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:all .3s}
.nav__burger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav__burger.active span:nth-child(2){opacity:0}
.nav__burger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 22px;border-radius:var(--r-sm);font-family:var(--fw-head);font-weight:600;font-size:.95rem;cursor:pointer;border:none;transition:all .25s;white-space:nowrap}
.btn--primary{background:linear-gradient(135deg,var(--cyan),var(--mint));color:#0A1929;box-shadow:0 4px 20px var(--glow)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--glow)}
.btn--ghost{background:var(--surface);color:var(--text);border:1px solid var(--border-2)}
.btn--ghost:hover{background:var(--surface-2);border-color:var(--cyan)}
.btn--lg{padding:14px 32px;font-size:1.05rem}

.hero{position:relative;min-height:100vh;display:flex;align-items:center;padding:130px 0 100px;overflow:hidden}
.hero__inner{flex:1;width:100%;max-width:var(--max);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:40px}
.hero__copy{max-width:620px}
.hero__eyebrow{display:inline-flex;align-items:center;padding:6px 16px;background:var(--surface);border:1px solid var(--border-2);border-radius:100px;font-size:.85rem;color:var(--text-2);margin-bottom:24px;font-family:var(--fw-head)}
.hero__title{font-size:clamp(2.2rem,5vw,3.9rem);font-weight:700;margin-bottom:24px}
.hero__sub{font-size:1.1rem;color:var(--text-2);max-width:560px;margin-bottom:36px;line-height:1.7}
.hero__cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:60px}
.hero__stats{display:flex;gap:36px;flex-wrap:wrap}
.hero__stat{display:flex;flex-direction:column}
.hero__stat-num{font-family:var(--fw-head);font-size:2.2rem;font-weight:700;color:var(--mint);line-height:1}
.hero__stat-num span{font-size:1.4rem}
.hero__stat-unit{font-size:.85rem;color:var(--text-3);margin-top:4px}
.hero__visual{position:relative;width:100%;max-width:440px;aspect-ratio:1/1;margin-left:auto;pointer-events:none}
.hero__wave{position:absolute;bottom:0;left:0;right:0;line-height:0}
.hero__wave svg{width:100%;height:80px}

.twin-viz{position:relative;width:100%;height:100%;display:flex;align-items:center;justify-content:center}
.twin-viz__core{width:260px;height:260px;animation:pulse 4s ease-in-out infinite}
.twin-viz__core svg{width:100%;height:100%}
.twin-viz__core circle:nth-child(2){animation:spin 30s linear infinite;transform-origin:center}
.twin-viz__core circle:nth-child(3){animation:spin 20s linear infinite reverse;transform-origin:center}
@keyframes pulse{0%,100%{opacity:.9}50%{opacity:1}}
@keyframes spin{from{transform:rotate(0)}to{transform:rotate(360deg)}}
.twin-viz__ring{position:absolute;border-radius:50%;border:1px dashed rgba(6,182,212,.2)}
.twin-viz__ring--1{width:340px;height:340px;animation:spin 40s linear infinite}
.twin-viz__ring--2{width:420px;height:420px;border-color:rgba(45,212,191,.12);animation:spin 60s linear infinite reverse}
.twin-viz__node{position:absolute;padding:6px 14px;background:rgba(10,25,41,.9);border:1px solid var(--border-2);border-radius:100px;font-size:.8rem;font-family:var(--fw-head);color:var(--cyan);backdrop-filter:blur(10px)}
.twin-viz__node--1{top:18%;right:10%}
.twin-viz__node--2{bottom:20%;right:5%}
.twin-viz__node--3{bottom:10%;left:15%}

.section{padding:100px 0;position:relative}
.section--twin{background:linear-gradient(180deg,transparent,rgba(6,182,212,.03),transparent)}
.section--why{background:rgba(255,255,255,.01)}
.section--cta{padding:80px 0}
.section__head{text-align:center;max-width:720px;margin:0 auto 64px}
.section__eyebrow{display:inline-flex;align-items:center;padding:6px 16px;background:var(--surface);border:1px solid var(--border-2);border-radius:100px;font-size:.85rem;color:var(--text-2);margin-bottom:20px;font-family:var(--fw-head)}
.section__title{font-size:clamp(2rem,4vw,3rem);font-weight:700;margin-bottom:16px}
.section__desc{font-size:1.05rem;color:var(--text-2)}

.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.bento__card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:32px;transition:all .3s;position:relative;overflow:hidden}
.bento__card::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(6,182,212,.06),transparent 60%);opacity:0;transition:opacity .3s}
.bento__card:hover{border-color:var(--cyan);transform:translateY(-4px);box-shadow:var(--shadow)}
.bento__card:hover::before{opacity:1}
.bento__card--lg{grid-column:span 1;grid-row:span 2;display:flex;flex-direction:column}
.bento__card--accent{border-color:rgba(45,212,191,.3);background:linear-gradient(135deg,rgba(45,212,191,.06),var(--surface))}
.bento__icon{margin-bottom:20px;position:relative;z-index:1}
.bento__title{font-size:1.3rem;margin-bottom:12px;position:relative;z-index:1}
.bento__desc{color:var(--text-2);font-size:.95rem;position:relative;z-index:1;flex:1}
.bento__tags{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;position:relative;z-index:1}
.bento__tags li{padding:4px 12px;background:rgba(6,182,212,.1);border:1px solid rgba(6,182,212,.2);border-radius:100px;font-size:.78rem;color:var(--cyan)}
.bento__more{display:inline-block;margin-top:16px;color:var(--mint);font-family:var(--fw-head);font-weight:600;font-size:.9rem;position:relative;z-index:1}
.bento__more:hover{color:var(--cyan)}
.bento__badge{position:absolute;top:20px;right:20px;padding:4px 12px;background:var(--accent);color:#0A1929;border-radius:100px;font-size:.72rem;font-weight:700;font-family:var(--fw-head);z-index:2}

.tabs__bar{display:flex;gap:8px;justify-content:center;margin-bottom:40px;flex-wrap:wrap}
.tabs__btn{padding:12px 28px;background:var(--surface);border:1px solid var(--border-2);border-radius:100px;color:var(--text-2);font-family:var(--fw-head);font-weight:600;font-size:.95rem;cursor:pointer;transition:all .25s}
.tabs__btn:hover{color:var(--text);border-color:var(--cyan)}
.tabs__btn.is-active{background:linear-gradient(135deg,var(--cyan),var(--mint));color:#0A1929;border-color:transparent}
.tabs__panel{display:none}
.tabs__panel.is-active{display:block;animation:fadeIn .4s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.twin-detail{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-xl);padding:48px}
.twin-detail__visual{display:flex;justify-content:center}
.twin-detail__text h3{font-size:1.6rem;margin-bottom:16px}
.twin-detail__text p{color:var(--text-2);margin-bottom:20px}
.check-list{list-style:none;display:flex;flex-direction:column;gap:12px}
.check-list li{position:relative;padding-left:28px;color:var(--text)}
.check-list li::before{content:'';position:absolute;left:0;top:6px;width:16px;height:16px;border-radius:50%;background:linear-gradient(135deg,var(--cyan),var(--mint))}
.check-list li::after{content:'';position:absolute;left:5px;top:10px;width:6px;height:3px;border-left:2px solid #0A1929;border-bottom:2px solid #0A1929;transform:rotate(-45deg)}

.twin-diagram{display:flex;align-items:center;gap:20px;flex-wrap:wrap;justify-content:center}
.twin-diagram__real,.twin-diagram__twin{display:flex;flex-direction:column;align-items:center;gap:12px;flex:1 1 150px;min-width:0}
.twin-diagram__label{font-size:.78rem;color:var(--text-3);font-family:var(--fw-head);letter-spacing:.04em}
.twin-diagram__box{width:100%;max-width:170px;height:150px;border:2px solid var(--border-2);border-radius:var(--r);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:var(--surface)}
.twin-diagram__icon{font-size:2.4rem;line-height:1}
.twin-diagram__name{font-family:var(--fw-head);font-weight:600;font-size:.95rem;color:var(--text);letter-spacing:.02em}
.twin-diagram__box--glow{border-color:var(--cyan);box-shadow:0 0 30px rgba(6,182,212,.2);background:rgba(6,182,212,.05)}
.twin-diagram__box--glow .twin-diagram__name{color:var(--cyan)}
.twin-diagram__arrow{font-size:2rem;color:var(--mint);animation:pulse 2s ease-in-out infinite}

.process{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative}
.process::before{content:'';position:absolute;top:32px;left:12%;right:12%;height:2px;background:linear-gradient(90deg,transparent,var(--cyan),var(--mint),transparent)}
.process__step{text-align:center;position:relative}
.process__num{width:64px;height:64px;margin:0 auto 24px;border-radius:50%;background:var(--bg);border:2px solid var(--cyan);display:flex;align-items:center;justify-content:center;font-family:var(--fw-head);font-weight:700;font-size:1.3rem;color:var(--mint);position:relative;z-index:1;box-shadow:0 0 20px rgba(6,182,212,.2)}
.process__title{font-size:1.2rem;margin-bottom:12px}
.process__desc{color:var(--text-2);font-size:.92rem;padding:0 8px}

.why{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.why__card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:32px;text-align:center;transition:all .3s}
.why__card:hover{border-color:var(--mint);transform:translateY(-4px)}
.why__icon{font-size:2.5rem;margin-bottom:16px}
.why__card h3{font-size:1.2rem;margin-bottom:12px}
.why__card p{color:var(--text-2);font-size:.92rem}

/* 案例展示 */
.section--cases{background:linear-gradient(180deg,transparent,rgba(6,182,212,.025),transparent)}
.cases{display:flex;flex-direction:column;gap:24px}
.cases__row{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.case{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:32px;transition:all .3s;position:relative;overflow:hidden}
.case:hover{border-color:var(--cyan);transform:translateY(-4px);box-shadow:var(--shadow)}
.case--feature{display:grid;grid-template-columns:1.15fr .85fr;gap:0;padding:0;overflow:hidden}
.case__media{position:relative;overflow:hidden;background:linear-gradient(135deg,rgba(6,182,212,.08),rgba(10,25,41,.4))}
.case__media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .6s ease}
.case--feature:hover .case__media img{transform:scale(1.03)}
.case__tag{position:absolute;top:20px;left:20px;padding:6px 14px;background:rgba(10,25,41,.88);border:1px solid rgba(45,212,191,.4);border-radius:100px;font-size:.78rem;color:var(--mint);font-family:var(--fw-head);font-weight:600;backdrop-filter:blur(10px)}
.case__body{padding:36px;display:flex;flex-direction:column}
.case--feature .case__body{padding:44px;justify-content:center}
.case__icon{margin-bottom:20px}
.case__index{font-family:var(--fw-head);font-size:2.4rem;font-weight:700;color:rgba(6,182,212,.28);line-height:1;margin-bottom:8px}
.case__title{font-size:1.35rem;margin-bottom:14px}
.case--feature .case__title{font-size:1.6rem}
.case__desc{color:var(--text-2);font-size:.96rem;margin-bottom:20px;line-height:1.75}
.case__points{list-style:none;display:flex;flex-direction:column;gap:10px;margin-bottom:22px}
.case__points li{position:relative;padding-left:24px;color:var(--text-2);font-size:.92rem}
.case__points li::before{content:'';position:absolute;left:2px;top:9px;width:8px;height:8px;border-radius:2px;background:linear-gradient(135deg,var(--cyan),var(--mint));transform:rotate(45deg)}
.case__stack{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto}
.case__stack span{padding:4px 12px;background:rgba(255,255,255,.04);border:1px solid var(--border-2);border-radius:100px;font-size:.76rem;color:var(--text-3);font-family:var(--fw-head)}

.cta{background:linear-gradient(135deg,rgba(6,182,212,.08),rgba(45,212,191,.04));border:1px solid var(--border-2);border-radius:var(--r-xl);padding:64px;display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap;position:relative;overflow:hidden}
.cta::before{content:'';position:absolute;top:-50%;right:-10%;width:400px;height:400px;background:radial-gradient(circle,rgba(6,182,212,.12),transparent 70%);border-radius:50%}
.cta__title{font-size:clamp(1.6rem,3vw,2.4rem);margin-bottom:12px;position:relative;z-index:1}
.cta__desc{color:var(--text-2);max-width:480px;position:relative;z-index:1}
.cta__action{display:flex;flex-direction:column;gap:12px;align-items:flex-start;position:relative;z-index:1}
.cta__email{color:var(--text-3);font-size:.9rem;font-family:var(--fw-head)}
.cta__email:hover{color:var(--cyan)}

.footer{border-top:1px solid var(--border);padding:60px 0 0;background:rgba(255,255,255,.01)}
.footer__inner{display:flex;justify-content:space-between;gap:60px;flex-wrap:wrap;padding-bottom:40px}
.footer__logo{display:flex;align-items:center;gap:8px;font-family:var(--fw-head);font-weight:700;margin-bottom:12px}
.footer__tagline{color:var(--text-3);font-size:.9rem}
.footer__links{display:flex;gap:48px;flex-wrap:wrap}
.footer__col h4{font-size:.85rem;color:var(--text-3);margin-bottom:16px;font-family:var(--fw-head);letter-spacing:.05em}
.footer__col a{display:block;color:var(--text-2);font-size:.9rem;margin-bottom:10px;transition:color .2s}
.footer__col a:hover{color:var(--cyan)}
.footer__bottom{border-top:1px solid var(--border);padding:20px 0}
.footer__bottom-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;font-size:.85rem;color:var(--text-3)}

.reveal{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s ease}
.reveal.is-visible{opacity:1;transform:translateY(0)}

@media(max-width:1024px){
  .hero__visual{display:none}
  .hero__inner{grid-template-columns:1fr}
  .hero__copy{max-width:none}
  .bento{grid-template-columns:repeat(2,1fr)}
  .bento__card--lg{grid-row:span 1}
  .process{grid-template-columns:repeat(2,1fr)}
  .process::before{display:none}
  .why{grid-template-columns:repeat(2,1fr)}
  .twin-detail{grid-template-columns:1fr;gap:32px}
  .case--feature{grid-template-columns:1fr}
  .case--feature .case__body{padding:36px}
}
@media(max-width:680px){
  .nav__links{position:fixed;top:72px;left:0;right:0;flex-direction:column;background:rgba(10,25,41,.97);backdrop-filter:blur(20px);padding:24px;gap:4px;border-bottom:1px solid var(--border);transform:translateY(-150%);transition:transform .3s;align-items:stretch}
  .nav__links.open{transform:translateY(0)}
  .nav__link{padding:12px 16px}
  .nav__cta{margin:8px 0 0;text-align:center}
  .nav__burger{display:flex}
  .hero{padding:100px 0 72px;min-height:auto}
  .hero__inner{grid-template-columns:1fr;gap:0}
  .hero__title{font-size:2.3rem;line-height:1.25}
  .hero__sub{font-size:1rem}
  .hero__cta{gap:12px;margin-bottom:40px}
  .btn--lg{padding:13px 26px;font-size:1rem}
  .hero__stats{gap:24px}
  .hero__stat-num{font-size:1.6rem}
  .bento{grid-template-columns:1fr}
  .process,.why{grid-template-columns:1fr}
  .cases__row{grid-template-columns:1fr}
  .case{padding:24px}
  .case--feature .case__body{padding:28px}
  .case__title{font-size:1.2rem}
  .case--feature .case__title{font-size:1.3rem}
  .cta{padding:32px;flex-direction:column;text-align:center}
  .cta__action{align-items:center}
  .twin-detail{padding:24px}
  .footer__inner{flex-direction:column;gap:32px}
  .footer__links{gap:32px}
  .section{padding:60px 0}
}