:root{
  --color-primary:#2f8fb5;
  --color-primary-dark:#1e6683;
  --color-primary-light:#4fc3e0;
  --color-secondary:#7fbf9e;
  --color-secondary-dark:#5aa27c;
  --color-dark:#16232c;
  --color-text:#2b3a42;
  --color-gray:#4d5761;
  --color-light-gray:#f4f7f8;
  --color-border:#e3e9eb;
  --color-white:#ffffff;
  --shadow-sm:0 2px 8px rgba(22,35,44,.06);
  --shadow-md:0 8px 24px rgba(22,35,44,.10);
  --radius:12px;
  --max-width:1140px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans TC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--color-text);
  background:var(--color-white);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
h1,h2,h3{margin:0 0 .5em;color:var(--color-dark);font-weight:900;letter-spacing:.02em;}
p{margin:0 0 1em;}

.container{max-width:var(--max-width);margin:0 auto;padding:0 24px;}

.section-eyebrow{
  color:var(--color-primary);
  font-weight:700;
  letter-spacing:.12em;
  font-size:.85rem;
  margin-bottom:.5em;
}

.btn{
  display:inline-block;
  padding:14px 32px;
  border-radius:999px;
  font-weight:700;
  font-size:1rem;
  border:2px solid transparent;
  cursor:pointer;
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease,color .15s ease;
}
.btn:hover{transform:translateY(-2px);}
.btn-primary{background:var(--color-primary);color:var(--color-white);box-shadow:var(--shadow-sm);}
.btn-primary:hover{background:var(--color-primary-dark);box-shadow:var(--shadow-md);}
.btn-outline{border-color:var(--color-white);color:var(--color-white);}
.btn-outline:hover{background:rgba(255,255,255,.15);}
.btn-block{width:100%;text-align:center;border:none;}

/* Header */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--color-border);
}
.header-inner{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{
  height:42px;width:auto;flex:none;
  object-fit:contain;
}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-zh{font-weight:900;font-size:1.05rem;color:var(--color-dark);}
.brand-en{font-size:.68rem;color:var(--color-gray);letter-spacing:.03em;}

.site-nav{display:flex;align-items:center;gap:32px;}
.site-nav a{font-weight:500;color:var(--color-text);transition:color .15s ease;}
.site-nav a:hover{color:var(--color-primary);}
.nav-cta{
  padding:10px 22px;border-radius:999px;
  background:var(--color-primary);color:var(--color-white) !important;
  font-weight:700;
}
.nav-cta:hover{background:var(--color-primary-dark);}

.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:40px;height:40px;border:none;background:none;cursor:pointer;padding:0;
}
.nav-toggle span{width:100%;height:2px;background:var(--color-dark);border-radius:2px;transition:transform .2s ease,opacity .2s ease;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* Hero */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(160deg,var(--color-dark) 0%,#1c3040 100%);
  color:var(--color-white);
  padding:120px 0 100px;
}
.hero-shape{position:absolute;opacity:.9;}
.hero-shape-blue{
  top:-10%;right:-8%;width:55%;height:70%;
  background:var(--color-primary-light);
  clip-path:polygon(30% 0,100% 0,100% 100%,0 60%);
  opacity:.85;
}
.hero-shape-green{
  bottom:-25%;right:5%;width:32%;height:60%;
  background:var(--color-secondary);
  clip-path:polygon(20% 0,100% 30%,80% 100%,0 100%);
  opacity:.5;
}
.hero-inner{position:relative;z-index:1;max-width:640px;}
.hero-eyebrow{
  color:var(--color-primary-light);font-weight:700;
  letter-spacing:.08em;margin-bottom:1em;font-size:.95rem;
}
.hero h1{font-size:2.6rem;line-height:1.35;color:var(--color-white);margin-bottom:.6em;}
.hero-desc{color:#c8d6dc;font-size:1.05rem;margin-bottom:2em;}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;}

/* Scroll-reveal + hero load-in animation */
@media (prefers-reduced-motion: no-preference){
  .hero-eyebrow,.hero h1,.hero-desc,.hero-actions{
    opacity:0;
    transform:translateY(36px);
    animation:heroIn .9s cubic-bezier(.16,.84,.44,1) forwards;
  }
  .hero-eyebrow{animation-delay:.1s;}
  .hero h1{animation-delay:.25s;}
  .hero-desc{animation-delay:.45s;}
  .hero-actions{animation-delay:.65s;}

  @keyframes heroIn{
    to{opacity:1;transform:translateY(0);}
  }

  .reveal{
    opacity:0;
    transform:translateY(60px) scale(.96);
    transition:opacity .9s cubic-bezier(.16,.84,.44,1),transform .9s cubic-bezier(.16,.84,.44,1);
  }
  .reveal.is-visible{opacity:1;transform:translateY(0) scale(1);}

  .service-list .reveal:nth-child(2){transition-delay:.1s;}
  .service-list .reveal:nth-child(3){transition-delay:.2s;}
  .service-list .reveal:nth-child(4){transition-delay:.3s;}

  .contact-list .reveal:nth-child(2){transition-delay:.1s;}
  .contact-list .reveal:nth-child(3){transition-delay:.2s;}
  .contact-list .reveal:nth-child(4){transition-delay:.3s;}

  .about-card.reveal{transition-delay:.15s;}
}

/* About */
.about{padding:100px 0;}
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:64px;align-items:start;}
.about h2{font-size:2rem;}
.about-points{margin-top:1.5em;display:flex;flex-direction:column;gap:.7em;}
.about-points li{
  padding-left:1.6em;position:relative;color:var(--color-text);
}
.about-points li::before{
  content:"";position:absolute;left:0;top:.5em;
  width:8px;height:8px;border-radius:2px;background:var(--color-secondary);
}
.about-card{
  background:var(--color-light-gray);
  border-radius:var(--radius);
  padding:36px;
  border:1px solid var(--color-border);
}
.about-card h3{font-size:1.1rem;margin-bottom:1.2em;}
.about-card dl{margin:0;display:flex;flex-direction:column;gap:14px;}
.about-card dl div{display:flex;flex-direction:column;gap:2px;}
.about-card dt{font-size:.78rem;color:var(--color-gray);}
.about-card dd{margin:0;font-weight:700;color:var(--color-dark);}

/* Services */
.service{padding:100px 0;}
.service-alt{background:var(--color-light-gray);}

#service-longterm{
  background-image:linear-gradient(rgba(244,247,248,.8),rgba(244,247,248,.8)),url('../img/service-longterm-bg.jpg');
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
}
#service-power{
  background-image:linear-gradient(rgba(255,255,255,.8),rgba(255,255,255,.8)),url('../img/service-power-bg.jpg');
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
}
.service-grid{display:grid;grid-template-columns:.9fr 1.4fr;gap:56px;align-items:center;}
.service-grid-reverse{grid-template-columns:1.4fr .9fr;}
.service-grid-reverse .service-header{order:2;}
.service-grid-reverse .service-list{order:1;}
.service-header h2{font-size:1.9rem;}
.service-lead{color:var(--color-gray);}
.service-list{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.service-item{
  background:var(--color-white);
  border:1px solid var(--color-border);
  border-radius:var(--radius);
  padding:26px 24px;
  transition:box-shadow .2s ease,transform .2s ease;
}
.service-alt .service-item{background:var(--color-white);}
.service:not(.service-alt) .service-item{background:var(--color-light-gray);border-color:var(--color-border);}
.service-item:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);}
.service-item{display:flex;flex-direction:column;align-items:flex-start;}
.service-item h3{font-size:1.05rem;color:var(--color-primary-dark);margin-bottom:.5em;}
.service-item p{margin:0;font-size:.92rem;color:var(--color-text);}
.service-item .service-summary{margin-bottom:0;}
.service-detail{display:none;}

.service-more{
  display:inline-flex;align-items:center;gap:6px;
  margin-top:14px;padding:0;border:none;background:none;
  color:var(--color-primary);font-weight:700;font-size:.88rem;
  cursor:pointer;font-family:inherit;
}
.service-more span{transition:transform .15s ease;}
.service-more:hover{color:var(--color-primary-dark);}
.service-more:hover span{transform:translateX(3px);}

/* Service detail modal */
.modal-overlay{
  position:fixed;inset:0;z-index:1000;
  background:rgba(15,26,33,.6);
  display:flex;align-items:center;justify-content:center;
  padding:24px;
  opacity:0;transition:opacity .2s ease;
}
.modal-overlay[hidden]{display:none;}
.modal-overlay.is-open{opacity:1;}
.modal{
  background:var(--color-white);
  border-radius:var(--radius);
  max-width:560px;width:100%;
  max-height:80vh;overflow-y:auto;
  padding:40px;
  position:relative;
  box-shadow:var(--shadow-md);
  transform:translateY(16px) scale(.98);
  transition:transform .2s ease;
}
.modal-overlay.is-open .modal{transform:translateY(0) scale(1);}
.modal h3{font-size:1.3rem;margin-bottom:.8em;padding-right:24px;}
.modal-body p{margin:0;color:var(--color-text);line-height:1.9;}
.modal-body p + p{margin-top:1em;}
.modal-img{
  display:block;width:100%;margin-top:1em;
  border:1px solid var(--color-border);border-radius:8px;
}
.modal-img-caption{
  margin-top:.5em !important;text-align:center;
  font-size:.8rem;color:var(--color-gray);
}
.modal-close{
  position:absolute;top:16px;right:16px;
  width:32px;height:32px;border-radius:50%;
  border:none;background:var(--color-light-gray);
  font-size:1.4rem;line-height:1;color:var(--color-gray);
  cursor:pointer;display:flex;align-items:center;justify-content:center;
}
.modal-close:hover{background:var(--color-border);color:var(--color-dark);}

.modal.modal-iframe{
  max-width:820px;width:92%;
  max-height:82vh;height:82vh;
  padding:0;display:flex;flex-direction:column;overflow:hidden;
}
.modal.modal-iframe h3{
  margin:0;padding:20px 56px 16px 24px;
  border-bottom:1px solid var(--color-border);
}
.modal.modal-iframe .modal-body{flex:1;min-height:0;}
.modal.modal-iframe iframe{width:100%;height:100%;border:0;display:block;}

/* Case studies */
.cases{
  padding:100px 0;
  background-image:linear-gradient(rgba(244,247,248,.8),rgba(244,247,248,.8)),url('../img/cases-bg.jpg');
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
}
.cases-header{max-width:640px;margin:0 auto 48px;text-align:center;}
.cases-header h2{font-size:2rem;}
.cases-lead{color:var(--color-gray);margin:0;}
.cases-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:900px;margin:0 auto;}
.case-card{
  background:var(--color-white);
  border:1px solid var(--color-border);
  border-radius:var(--radius);
  padding:28px;
  box-shadow:var(--shadow-sm);
}
.case-tag{font-weight:700;color:var(--color-dark);font-size:1.05rem;margin:0 0 .3em;}
.case-period{color:var(--color-gray);font-size:.82rem;margin:0 0 1.2em;}
.case-compare{display:flex;align-items:center;gap:10px;margin-bottom:1.2em;}
.case-box{
  flex:1;min-width:0;
  display:flex;flex-direction:column;gap:3px;
  border-radius:8px;border:2px solid;padding:14px;
}
.case-box-current{border-color:#e0554a;background:#fdf1f0;}
.case-box-recommend{border-color:var(--color-secondary-dark);background:#eef7f1;}
.case-box-label{font-size:.7rem;font-weight:700;letter-spacing:.03em;}
.case-box-current .case-box-label{color:#c0392b;}
.case-box-recommend .case-box-label{color:var(--color-secondary-dark);}
.case-box-plan{font-weight:700;color:var(--color-dark);font-size:.86rem;margin:.3em 0;line-height:1.4;}
.case-box-stat{font-size:.76rem;color:var(--color-gray);}
.case-compare .case-arrow{flex:none;font-size:1.2rem;color:var(--color-primary);font-weight:700;}
.case-savings{margin:0;color:var(--color-text);font-size:.9rem;}
.case-savings strong{display:block;color:var(--color-primary-dark);font-size:1.7rem;margin-top:.2em;}
.cases-disclaimer{max-width:820px;margin:40px auto 0;text-align:center;color:var(--color-gray);font-size:.78rem;line-height:1.8;}

/* Contact */
.contact{padding:100px 0;background:var(--color-dark);color:var(--color-white);}
.contact .section-eyebrow{color:var(--color-primary-light);}
.contact h2{color:var(--color-white);font-size:2rem;}
.contact-lead{color:#c8d6dc;}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;}
.contact-list{display:flex;flex-direction:column;gap:18px;margin:2em 0;}
.contact-list li{display:flex;align-items:center;gap:14px;}
.contact-icon{
  display:flex;align-items:center;justify-content:center;flex:none;
  width:38px;height:38px;border-radius:50%;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.15);
  color:var(--color-primary-light);
}
.contact-icon svg{width:18px;height:18px;}
.contact-label{display:block;font-size:.75rem;color:#9db0ba;margin-bottom:2px;}
.contact-list a{font-weight:700;color:var(--color-white);}
.contact-list a:hover{color:var(--color-primary-light);}
.map-wrap{
  border-radius:var(--radius);overflow:hidden;
  border:1px solid rgba(255,255,255,.15);
  aspect-ratio:16/10;
}
.map-wrap iframe{width:100%;height:100%;border:0;}

.contact-form{
  background:var(--color-white);
  border-radius:var(--radius);
  padding:36px;
  color:var(--color-text);
  box-shadow:var(--shadow-md);
  align-self:start;
}
.form-row{margin-bottom:18px;}
.form-row label{display:block;font-weight:700;font-size:.88rem;margin-bottom:6px;color:var(--color-dark);}
.form-row input,.form-row select,.form-row textarea{
  width:100%;padding:12px 14px;
  border:1px solid var(--color-border);border-radius:8px;
  font-family:inherit;font-size:.95rem;color:var(--color-text);
  background:var(--color-white);
  transition:border-color .15s ease,box-shadow .15s ease;
}
.form-row input:focus,.form-row select:focus,.form-row textarea:focus{
  outline:none;border-color:var(--color-primary);
  box-shadow:0 0 0 3px rgba(47,143,181,.15);
}
.form-row textarea{resize:vertical;}

.form-honeypot{position:absolute;left:-9999px;width:1px;height:1px;opacity:0;}

.form-message{
  margin-bottom:18px;padding:12px 14px;border-radius:8px;
  font-size:.9rem;font-weight:500;
}
.form-message[hidden]{display:none;}
.form-message.success{background:#e8f5ee;color:#2f7a55;border:1px solid #b9e3cb;}
.form-message.error{background:#fdecec;color:#b3392f;border:1px solid #f3c3bf;}

.form-consent label{
  display:flex;align-items:flex-start;gap:10px;
  font-weight:400;font-size:.85rem;color:var(--color-gray);cursor:pointer;
}
.form-consent input[type="checkbox"]{
  width:auto;flex:none;margin-top:3px;accent-color:var(--color-primary);cursor:pointer;
}
.form-consent a{color:var(--color-primary);text-decoration:underline;text-underline-offset:2px;}
.form-consent a:hover{color:var(--color-primary-dark);}

/* Legal / policy pages */
.legal-page{padding:140px 0 100px;max-width:760px;}
.legal-page h1{font-size:2rem;margin-bottom:.3em;}
.legal-page .legal-updated{color:var(--color-gray);font-size:.9rem;margin-bottom:2.5em;}
.legal-page h2{font-size:1.25rem;color:var(--color-primary-dark);margin-top:2em;margin-bottom:.6em;}
.legal-page p{color:var(--color-text);margin-bottom:1em;}
.legal-page ul{margin:0 0 1em;padding-left:1.4em;list-style:disc;}
.legal-page li{margin-bottom:.5em;color:var(--color-text);}
.legal-page a{color:var(--color-primary);text-decoration:underline;text-underline-offset:2px;}
.legal-page .back-home{display:inline-block;margin-top:2.5em;font-weight:700;color:var(--color-primary);}

.is-embedded .site-header,
.is-embedded .site-footer,
.is-embedded .back-home{display:none;}
.is-embedded .legal-page{padding:32px 24px 48px;max-width:100%;}

/* Footer */
.site-footer{background:#0f1a21;color:#8fa2ac;padding:32px 0;}
.footer-inner{text-align:center;font-size:.85rem;}
.footer-inner p{margin:.3em 0;}
.footer-inner a{color:#c8d6dc;text-decoration:underline;text-underline-offset:2px;}
.footer-inner a:hover{color:var(--color-primary-light);}

/* Responsive */
@media (max-width:1024px){
  .about-grid,.service-grid,.service-grid-reverse{grid-template-columns:1fr;}
  .service-grid-reverse .service-header,.service-grid-reverse .service-list{order:initial;}
  .contact-grid{grid-template-columns:1fr;}
  .hero{padding:100px 0 80px;}
}

@media (max-width:768px){
  .nav-toggle{display:flex;}
  .site-nav{
    position:absolute;top:72px;left:0;right:0;
    background:var(--color-white);
    border-bottom:1px solid var(--color-border);
    flex-direction:column;align-items:stretch;gap:0;
    padding:8px 24px 20px;
    display:none;
  }
  .site-nav.open{display:flex;}
  .site-nav a{padding:14px 0;border-bottom:1px solid var(--color-border);}
  .site-nav a:last-child{border-bottom:none;}
  .nav-cta{text-align:center;margin-top:12px;}

  .hero h1{font-size:2rem;}
  .hero-desc{font-size:1rem;}

  .service-list{grid-template-columns:1fr;}

  .about,.service,.contact,.cases{padding:70px 0;}

  .contact-icon{width:40px;height:40px;flex-shrink:0;}

  .cases-grid{grid-template-columns:1fr;}
}

@media (max-width:480px){
  .hero{padding:90px 0 60px;}
  .hero h1{font-size:1.7rem;}
  .btn{padding:13px 26px;font-size:.95rem;}
  .contact-form{padding:26px;}

  .case-compare{flex-direction:column;}
  .case-compare .case-arrow{transform:rotate(90deg);}
}