/* ==========================================================
   Real Scaffolding — Shared Stylesheet
   結構：1.Variables 2.Reset 3.Layout 4.Components 5.Sections 6.Utilities 7.Responsive
   ========================================================== */

/* 1. CSS Variables ------------------------------------------ */
:root{
  --color-primary:#f5a623;        /* 工程橙（安全色） */
  --color-primary-dark:#d98c0f;
  --color-dark:#0f1720;
  --color-dark-2:#1c2733;
  --color-text:#2b3440;
  --color-muted:#6b7684;
  --color-light:#f6f7f9;
  --color-white:#ffffff;
  --color-border:#e3e7ec;
  --font-base:"Noto Sans TC","PingFang HK","Microsoft JhengHei",system-ui,-apple-system,sans-serif;
  --font-heading:"Noto Sans TC","PingFang HK",system-ui,sans-serif;
  --fs-xs:.8rem; --fs-sm:.9rem; --fs-base:1rem; --fs-lg:1.15rem; --fs-xl:1.5rem; --fs-2xl:2rem; --fs-3xl:2.75rem; --fs-hero:clamp(2rem,5vw,3.75rem);
  --space-1:.5rem; --space-2:1rem; --space-3:1.5rem; --space-4:2rem; --space-5:3rem; --space-6:5rem;
  --radius:12px; --radius-sm:6px;
  --shadow:0 10px 30px rgba(15,23,32,.08);
  --shadow-lg:0 20px 50px rgba(15,23,32,.15);
  --container:1200px;
  --header-h:76px;
  --transition:.3s ease;
}

/* 2. Reset ---------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-base);color:var(--color-text);line-height:1.7;background:var(--color-white);padding-top:var(--header-h)}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{font-family:var(--font-heading);line-height:1.25;color:var(--color-dark);font-weight:700}
h1{font-size:var(--fs-hero)}h2{font-size:var(--fs-2xl)}h3{font-size:var(--fs-xl)}h4{font-size:var(--fs-lg)}
p{margin-bottom:var(--space-2)}
.skip-link{position:absolute;left:-999px;top:0;background:var(--color-primary);color:var(--color-dark);padding:.5rem 1rem;z-index:2000}
.skip-link:focus{left:0}

/* 3. Layout --------------------------------------------------- */
.container{width:min(100% - 2.5rem,var(--container));margin-inline:auto}
.section{padding:var(--space-6) 0}
.section--light{background:var(--color-light)}
.section--dark{background:var(--color-dark);color:#cfd6de}
.section--dark h2,.section--dark h3{color:var(--color-white)}
.section__head{max-width:720px;margin:0 auto var(--space-5);text-align:center}
.section__eyebrow{display:inline-block;color:var(--color-primary);font-weight:700;letter-spacing:.15em;text-transform:uppercase;font-size:var(--fs-xs);margin-bottom:var(--space-1)}
.section__head p{color:var(--color-muted)}
.section--dark .section__head p{color:#aeb7c2}
.grid{display:grid;gap:var(--space-4)}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--4{grid-template-columns:repeat(4,1fr)}

/* 4. Components ----------------------------------------------- */
/* 4.1 Header */
.header{position:fixed;inset:0 0 auto 0;height:var(--header-h);background:rgba(15,23,32,.92);backdrop-filter:blur(10px);z-index:1000;transition:box-shadow var(--transition),background var(--transition)}
.header.is-scrolled{background:rgba(15,23,32,.98);box-shadow:0 4px 20px rgba(0,0,0,.25)}
.header__inner{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:flex;align-items:center;gap:.6rem;color:var(--color-white);font-weight:800;font-size:1.2rem;letter-spacing:.02em}
.logo__mark{width:38px;height:38px;border-radius:8px;background:var(--color-primary);display:grid;place-items:center;color:var(--color-dark);font-weight:900}
.logo small{display:block;font-size:.7rem;font-weight:500;color:#aeb7c2;letter-spacing:.1em}
.nav__list{display:flex;align-items:center;gap:var(--space-3)}
.nav__link{color:#e6ebf0;font-weight:500;padding:.5rem 0;position:relative}
.nav__link::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--color-primary);transition:width var(--transition)}
.nav__link:hover::after,.nav__link.is-active::after{width:100%}
.nav__link.is-active{color:var(--color-primary)}
.nav__cta{margin-left:var(--space-2)}
.nav-toggle{display:none;background:none;border:0;width:44px;height:44px;cursor:pointer;position:relative;z-index:1100}
.nav-toggle span{display:block;width:26px;height:2px;background:#fff;margin:6px auto;transition:var(--transition)}
.nav-toggle.is-open span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* 4.2 Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem 1.75rem;border-radius:999px;font-weight:700;border:2px solid transparent;cursor:pointer;transition:var(--transition);line-height:1.2}
.btn--primary{background:var(--color-primary);color:var(--color-dark)}
.btn--primary:hover{background:var(--color-primary-dark);transform:translateY(-2px);box-shadow:0 8px 20px rgba(245,166,35,.35)}
.btn--outline{border-color:rgba(255,255,255,.6);color:var(--color-white)}
.btn--outline:hover{background:var(--color-white);color:var(--color-dark)}
.btn--dark{background:var(--color-dark);color:var(--color-white)}
.btn--dark:hover{background:var(--color-dark-2)}
.btn--whatsapp{background:#25d366;color:#fff}
.btn--whatsapp:hover{background:#1ebe5b}
.btn--sm{padding:.55rem 1.1rem;font-size:var(--fs-sm)}

/* 4.3 Cards */
.card{background:var(--color-white);border-radius:var(--radius);padding:var(--space-4);box-shadow:var(--shadow);transition:transform var(--transition),box-shadow var(--transition);height:100%}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.card__icon{width:56px;height:56px;border-radius:14px;background:rgba(245,166,35,.15);color:var(--color-primary-dark);display:grid;place-items:center;font-size:1.6rem;margin-bottom:var(--space-2)}
.card h3{font-size:var(--fs-lg);margin-bottom:.6rem}
.card p{color:var(--color-muted);font-size:var(--fs-sm);margin-bottom:0}
.card__link{display:inline-block;margin-top:var(--space-2);color:var(--color-primary-dark);font-weight:700;font-size:var(--fs-sm)}
.card--img{padding:0;overflow:hidden}
.card--img img{aspect-ratio:4/3;object-fit:cover;width:100%}
.card--img .card__body{padding:var(--space-3)}

/* 4.4 Hero */
.hero{position:relative;min-height:calc(100vh - var(--header-h));display:flex;align-items:center;color:var(--color-white);background:var(--color-dark) center/cover no-repeat;isolation:isolate}
.hero--sub{min-height:46vh;text-align:center}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(15,23,32,.92) 20%,rgba(15,23,32,.55) 70%,rgba(15,23,32,.3));z-index:-1}
.hero--sub::before{background:rgba(15,23,32,.72)}
.hero__content{max-width:680px;padding:var(--space-6) 0}
.hero--sub .hero__content{margin-inline:auto;padding:var(--space-5) 0}
.hero h1{color:var(--color-white);margin-bottom:var(--space-3)}
.hero h1 span{color:var(--color-primary)}
.hero__lead{font-size:var(--fs-lg);color:#d6dde5;margin-bottom:var(--space-4)}
.hero__actions{display:flex;flex-wrap:wrap;gap:var(--space-2)}
.hero__badges{display:flex;flex-wrap:wrap;gap:var(--space-3);margin-top:var(--space-5);font-size:var(--fs-sm);color:#cfd6de}
.hero__badges li::before{content:"✔";color:var(--color-primary);margin-right:.4rem}
.breadcrumb{display:flex;justify-content:center;gap:.5rem;font-size:var(--fs-sm);color:#aeb7c2;margin-bottom:var(--space-2)}
.breadcrumb a:hover{color:var(--color-primary)}

/* 4.5 Stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--space-3);text-align:center}
.stat__num{font-size:var(--fs-3xl);font-weight:800;color:var(--color-primary);line-height:1}
.stat__label{color:var(--color-muted);font-size:var(--fs-sm);margin-top:.4rem}
.section--dark .stat__label{color:#aeb7c2}

/* 4.6 Feature split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-5);align-items:center}
.split__img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg)}
.split__img img{aspect-ratio:4/3;object-fit:cover;width:100%}
.checklist li{padding-left:1.8rem;position:relative;margin-bottom:.6rem}
.checklist li::before{content:"✔";position:absolute;left:0;color:var(--color-primary-dark);font-weight:700}

/* 4.7 Steps */
.steps{counter-reset:step}
.step{position:relative;padding:var(--space-4) var(--space-3) var(--space-3);background:var(--color-white);border-radius:var(--radius);border:1px solid var(--color-border);height:100%}
.step::before{counter-increment:step;content:"0" counter(step);position:absolute;top:-1rem;left:var(--space-3);background:var(--color-primary);color:var(--color-dark);font-weight:800;padding:.2rem .7rem;border-radius:var(--radius-sm)}
.step h3{font-size:var(--fs-lg);margin-bottom:.5rem}
.step p{color:var(--color-muted);font-size:var(--fs-sm);margin:0}

/* 4.8 Testimonials */
.quote{background:var(--color-white);border-radius:var(--radius);padding:var(--space-4);box-shadow:var(--shadow);height:100%}
.quote p{font-style:italic}
.quote footer{font-weight:700;color:var(--color-dark);font-size:var(--fs-sm)}
.quote footer span{display:block;color:var(--color-muted);font-weight:400}

/* 4.9 CTA band */
.cta-band{background:linear-gradient(120deg,var(--color-primary),#ffc766);color:var(--color-dark);padding:var(--space-5) 0}
.cta-band__inner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);flex-wrap:wrap}
.cta-band h2{color:var(--color-dark);margin-bottom:.3rem}
.cta-band p{margin:0;font-weight:500}

/* 4.10 Accordion (FAQ) */
.accordion__item{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-white);margin-bottom:var(--space-2);overflow:hidden}
.accordion__btn{width:100%;text-align:left;background:none;border:0;padding:var(--space-3);display:flex;justify-content:space-between;align-items:center;gap:1rem;font-weight:700;cursor:pointer;color:var(--color-dark)}
.accordion__btn::after{content:"+";font-size:1.5rem;color:var(--color-primary-dark);transition:transform var(--transition)}
.accordion__btn[aria-expanded="true"]::after{transform:rotate(45deg)}
.accordion__panel{max-height:0;overflow:hidden;transition:max-height .35s ease}
.accordion__panel > div{padding:0 var(--space-3) var(--space-3);color:var(--color-muted)}

/* 4.11 Forms */
.form{display:grid;gap:var(--space-2)}
.form__row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-2)}
.form label{display:block;font-weight:600;font-size:var(--fs-sm);margin-bottom:.35rem}
.form input,.form select,.form textarea{width:100%;padding:.8rem 1rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-white);transition:border var(--transition),box-shadow var(--transition)}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px rgba(245,166,35,.25)}
.form textarea{min-height:140px;resize:vertical}
.form__error{color:#c0392b;font-size:var(--fs-xs);margin-top:.3rem;display:none}
.form .is-invalid input,.form .is-invalid textarea,.form .is-invalid select{border-color:#c0392b}
.form .is-invalid .form__error{display:block}
.form__status{display:none;padding:1rem;border-radius:var(--radius-sm);font-weight:600}
.form__status.is-success{display:block;background:#e8f8ee;color:#1e7e45}
.form__status.is-error{display:block;background:#fdecea;color:#c0392b}
.contact-info{display:grid;gap:var(--space-3)}
.contact-info__item{display:flex;gap:1rem}
.contact-info__icon{width:46px;height:46px;flex:0 0 46px;border-radius:12px;background:rgba(245,166,35,.15);display:grid;place-items:center;font-size:1.3rem}
.contact-info__item h4{margin-bottom:.2rem}
.contact-info__item p{margin:0;color:var(--color-muted)}

/* 4.12 Map placeholder */
.map{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);background:#dfe5ec;min-height:380px;display:grid;place-items:center;position:relative}
.map__placeholder{text-align:center;color:var(--color-muted);padding:var(--space-4)}
.map__placeholder strong{display:block;color:var(--color-dark);font-size:var(--fs-lg)}
.map iframe{width:100%;height:100%;min-height:380px;border:0;position:absolute;inset:0}

/* 4.13 Footer */
.footer{background:var(--color-dark);color:#aeb7c2;padding:var(--space-6) 0 var(--space-3);font-size:var(--fs-sm)}
.footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:var(--space-4);margin-bottom:var(--space-5)}
.footer h4{color:var(--color-white);margin-bottom:var(--space-2)}
.footer a:hover{color:var(--color-primary)}
.footer li{margin-bottom:.5rem}
.footer__social{display:flex;gap:.6rem;margin-top:var(--space-2)}
.footer__social a{width:38px;height:38px;border-radius:50%;border:1px solid rgba(255,255,255,.2);display:grid;place-items:center;font-weight:700;font-size:.8rem}
.footer__social a:hover{border-color:var(--color-primary);color:var(--color-primary)}
.footer__bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:var(--space-3);display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem}

/* 4.14 Floating buttons */
.back-to-top{position:fixed;right:1.25rem;bottom:1.25rem;width:46px;height:46px;border-radius:50%;background:var(--color-dark);color:#fff;border:0;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(12px);transition:var(--transition);z-index:900;font-size:1.1rem}
.back-to-top.is-visible{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{background:var(--color-primary);color:var(--color-dark)}
.whatsapp-float{position:fixed;right:1.25rem;bottom:5rem;width:52px;height:52px;border-radius:50%;background:#25d366;color:#fff;display:grid;place-items:center;font-weight:800;box-shadow:var(--shadow-lg);z-index:900}

/* 5. Sections ------------------------------------------------- */
.prose{max-width:820px;margin-inline:auto}
.prose h2{margin:var(--space-4) 0 var(--space-2)}
.prose h3{margin:var(--space-3) 0 var(--space-1);font-size:var(--fs-lg)}
.prose ul{list-style:disc;padding-left:1.4rem;margin-bottom:var(--space-2)}
.prose ol{padding-left:1.4rem;margin-bottom:var(--space-2);list-style:decimal}
.table{width:100%;border-collapse:collapse;margin:var(--space-3) 0;font-size:var(--fs-sm)}
.table th,.table td{border:1px solid var(--color-border);padding:.75rem 1rem;text-align:left}
.table th{background:var(--color-light)}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-2)}
.gallery figure{border-radius:var(--radius);overflow:hidden;position:relative}
.gallery img{aspect-ratio:4/3;object-fit:cover;width:100%;transition:transform .5s ease}
.gallery figure:hover img{transform:scale(1.06)}
.gallery figcaption{position:absolute;inset:auto 0 0 0;background:linear-gradient(transparent,rgba(15,23,32,.9));color:#fff;padding:1.5rem 1rem .8rem;font-size:var(--fs-sm)}
.filter{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem;margin-bottom:var(--space-4)}
.filter__btn{padding:.5rem 1.1rem;border-radius:999px;border:1px solid var(--color-border);background:#fff;cursor:pointer;font-size:var(--fs-sm)}
.filter__btn.is-active,.filter__btn:hover{background:var(--color-dark);color:#fff;border-color:var(--color-dark)}
.gallery figure[hidden]{display:none}
.gallery--lightbox .gallery__trigger{display:block;width:100%;margin:0;padding:0;border:0;background:transparent;cursor:zoom-in;font:inherit;color:inherit;text-align:inherit}
.gallery--lightbox .gallery__trigger:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
.gallery--lightbox .gallery__trigger img{display:block;width:100%}
.gallery__figure--zoom{cursor:zoom-in}
.gallery__figure--zoom .gallery__trigger:focus-visible{outline:none}
body.lightbox-open{overflow:hidden}
.lightbox{position:fixed;inset:0;z-index:10000;display:flex;align-items:center;justify-content:center;padding:var(--space-3);background:rgba(8,12,18,.92);opacity:0;visibility:hidden;transition:opacity .25s ease,visibility .25s ease}
.lightbox.is-open{opacity:1;visibility:visible}
.lightbox[hidden]{display:none!important}
.lightbox.is-open{display:flex!important}
.lightbox__stage{max-width:min(1200px,96vw);max-height:90vh;text-align:center}
.lightbox__img{max-width:100%;max-height:calc(90vh - 3rem);width:auto;height:auto;object-fit:contain;border-radius:var(--radius);box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox__caption{margin-top:var(--space-2);color:#fff;font-size:var(--fs-sm);opacity:.9}
.lightbox__close,.lightbox__nav{position:absolute;z-index:1;display:grid;place-items:center;border:0;background:rgba(255,255,255,.12);color:#fff;cursor:pointer;transition:background .2s ease}
.lightbox__close:hover,.lightbox__nav:hover{background:rgba(255,255,255,.22)}
.lightbox__close{top:var(--space-2);right:var(--space-2);width:2.75rem;height:2.75rem;border-radius:999px;font-size:1.75rem;line-height:1}
.lightbox__nav{top:50%;transform:translateY(-50%);width:2.75rem;height:2.75rem;border-radius:999px;font-size:2rem;line-height:1}
.lightbox__prev{left:var(--space-2)}
.lightbox__next{right:var(--space-2)}
.lightbox__nav[hidden],.lightbox__close[hidden]{display:none}

/* 6. Utilities / Animation ------------------------------------ */
.text-center{text-align:center}
.mt-4{margin-top:var(--space-4)}
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.is-visible{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.12s}.reveal[data-delay="2"]{transition-delay:.24s}.reveal[data-delay="3"]{transition-delay:.36s}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* 7. Responsive ----------------------------------------------- */
@media (max-width:1024px){
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(2,1fr)}
  .footer__grid{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:860px){
  .nav-toggle{display:block}
  .nav{position:fixed;top:var(--header-h);right:0;bottom:0;width:min(320px,85vw);background:var(--color-dark-2);transform:translateX(100%);transition:transform var(--transition);padding:var(--space-4);overflow-y:auto}
  .nav.is-open{transform:none;box-shadow:-10px 0 40px rgba(0,0,0,.4)}
  .nav__list{flex-direction:column;align-items:flex-start;gap:var(--space-2)}
  .nav__link{font-size:var(--fs-lg);display:block;width:100%}
  .nav__cta{margin:var(--space-2) 0 0}
  .split{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .section{padding:var(--space-5) 0}
}
@media (max-width:600px){
  :root{--header-h:66px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .form__row{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr}
  .gallery{grid-template-columns:1fr}
  .hero{min-height:auto}
  .cta-band__inner{flex-direction:column;text-align:center}
  .stats{grid-template-columns:1fr 1fr}
}