:root{
  --bg:#0f0e0c;
  --bg-soft:#16140f;
  --panel:#1c1a14;
  --ink:#ece6d8;
  --ink-soft:#a39c8c;
  --ink-faint:#6b6555;
  --gold:#c9a86a;
  --gold-deep:#9c7f48;
  --line:rgba(201,168,106,.18);
  --serif-en:'Cormorant Garamond',serif;
  --serif-tc:'Noto Serif TC',serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--serif-tc);
  font-weight:300;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* grain overlay */
body::after{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:9999;opacity:.04;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* nav */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  display:flex;align-items:center;justify-content:space-between;
  padding:1.6rem 3rem;
  background:linear-gradient(to bottom,rgba(15,14,12,.9),rgba(15,14,12,0));
  backdrop-filter:blur(6px);
}
.logo{
  font-family:var(--serif-en);font-size:1.5rem;font-weight:600;letter-spacing:.18em;
  display:flex;align-items:baseline;gap:.5em;
}
.logo span{font-size:.6rem;letter-spacing:.35em;color:var(--gold);font-weight:500}
.nav-links{display:flex;gap:2.2rem}
.nav-links a{
  font-size:.92rem;letter-spacing:.1em;color:var(--ink-soft);
  position:relative;transition:color .4s;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-6px;width:0;height:1px;
  background:var(--gold);transition:width .4s;
}
.nav-links a:hover,.nav-links a.active{color:var(--ink)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer}
.nav-toggle span{width:26px;height:1.5px;background:var(--ink);transition:.3s}

/* hero */
.hero{
  position:relative;min-height:100vh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;
  padding:6rem 1.5rem 4rem;overflow:hidden;
}
.hero-facets{
  position:absolute;inset:0;z-index:0;opacity:.5;
  background:
    radial-gradient(ellipse 60% 50% at 50% 40%,rgba(201,168,106,.1),transparent 70%),
    conic-gradient(from 130deg at 70% 30%,transparent 0deg,rgba(201,168,106,.05) 40deg,transparent 80deg),
    conic-gradient(from -40deg at 25% 65%,transparent 0deg,rgba(236,230,216,.04) 50deg,transparent 100deg);
}
.hero-facets::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(115deg,transparent 49.6%,var(--line) 49.8%,var(--line) 50%,transparent 50.2%),
    linear-gradient(65deg,transparent 49.6%,var(--line) 49.8%,var(--line) 50%,transparent 50.2%);
  background-size:340px 340px,420px 420px;opacity:.4;
}
.hero-inner{position:relative;z-index:2;max-width:900px}
.hero-eyebrow{
  font-size:.85rem;letter-spacing:.5em;color:var(--gold);margin-bottom:2rem;
  text-transform:uppercase;
}
.hero-title{
  font-family:var(--serif-tc);font-weight:400;line-height:1.25;
  font-size:clamp(2.6rem,7vw,5.6rem);letter-spacing:.04em;
}
.hero-title span{display:block}
.hero-title em{
  font-family:var(--serif-en);font-style:italic;font-weight:500;color:var(--gold);
  letter-spacing:.02em;
}
.hero-sub{margin-top:2rem;font-size:1.05rem;letter-spacing:.25em;color:var(--ink-soft)}
.hero-cta{margin-top:3rem;display:flex;gap:1.2rem;justify-content:center;flex-wrap:wrap}
.hero-scroll{
  position:absolute;bottom:2.4rem;left:50%;transform:translateX(-50%);z-index:2;
  font-size:.72rem;letter-spacing:.3em;color:var(--ink-faint);text-transform:uppercase;
}
.hero-scroll::after{
  content:"";display:block;width:1px;height:40px;background:var(--gold);margin:.8rem auto 0;
  animation:scrolldrop 2.4s infinite;transform-origin:top;
}
@keyframes scrolldrop{0%{transform:scaleY(0)}40%{transform:scaleY(1);transform-origin:top}41%{transform-origin:bottom}80%,100%{transform:scaleY(0);transform-origin:bottom}}

/* buttons */
.btn{
  display:inline-block;padding:.95rem 2.4rem;font-family:var(--serif-tc);
  font-size:.95rem;letter-spacing:.18em;transition:.45s;cursor:pointer;border:1px solid var(--gold);
}
.btn-solid{background:var(--gold);color:#1a1710}
.btn-solid:hover{background:transparent;color:var(--gold)}
.btn-ghost{color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}

/* strip */
.strip{
  display:grid;grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.strip-item{
  padding:3.2rem 2.5rem;border-right:1px solid var(--line);
}
.strip-item:last-child{border-right:0}
.strip-item .num{font-family:var(--serif-en);font-size:1rem;color:var(--gold);letter-spacing:.2em}
.strip-item p{margin-top:1rem;font-size:1.08rem;color:var(--ink-soft);line-height:1.9}

/* feature */
.feature{
  display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:center;
  max-width:1200px;margin:0 auto;padding:7rem 3rem;
}
.section-eyebrow{font-size:.8rem;letter-spacing:.4em;color:var(--gold);text-transform:uppercase;margin-bottom:1.5rem}
.feature h2{font-weight:400;font-size:clamp(1.8rem,3.5vw,2.8rem);line-height:1.4;letter-spacing:.03em}
.feature-body{margin:1.8rem 0 2.2rem;color:var(--ink-soft);font-size:1.05rem}
.link-arrow{color:var(--gold);letter-spacing:.12em;font-size:.98rem;border-bottom:1px solid transparent;transition:.4s;padding-bottom:3px}
.link-arrow:hover{border-color:var(--gold)}
.feature-visual{display:flex;justify-content:center;align-items:center;min-height:380px;position:relative}
.gem-shape{
  width:280px;height:280px;position:relative;
  background:linear-gradient(135deg,rgba(201,168,106,.22),rgba(201,168,106,.04));
  clip-path:polygon(50% 0,85% 25%,100% 60%,75% 100%,25% 100%,0 60%,15% 25%);
  border:1px solid var(--line);
  animation:gemfloat 7s ease-in-out infinite;
}
.gem-shape::before,.gem-shape::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(60deg,transparent 48%,var(--line) 50%,transparent 52%);
}
.gem-shape::after{background:linear-gradient(-60deg,transparent 48%,var(--line) 50%,transparent 52%)}
@keyframes gemfloat{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-18px) rotate(2deg)}}

/* cta band */
.cta-band{
  text-align:center;padding:6.5rem 2rem;background:var(--bg-soft);
  border-top:1px solid var(--line);
}
.cta-band h2{font-weight:400;font-size:clamp(1.7rem,4vw,2.6rem);letter-spacing:.04em}
.cta-band p{margin:1.4rem 0 2.6rem;color:var(--ink-soft);font-size:1.05rem}

/* footer */
.footer{border-top:1px solid var(--line);padding:3.5rem 3rem}
.footer-inner{max-width:1200px;margin:0 auto;display:flex;flex-direction:column;align-items:center;gap:1.6rem;text-align:center}
.footer-brand{font-family:var(--serif-en);font-size:1.3rem;letter-spacing:.18em;display:flex;gap:.5em;align-items:baseline}
.footer-brand span{font-size:.55rem;letter-spacing:.35em;color:var(--gold)}
.footer-nav{display:flex;gap:1.8rem;flex-wrap:wrap;justify-content:center}
.footer-nav a{font-size:.88rem;color:var(--ink-soft);letter-spacing:.1em;transition:color .3s}
.footer-nav a:hover{color:var(--gold)}
.footer-copy{font-size:.8rem;color:var(--ink-faint);letter-spacing:.1em}

/* page header (inner pages) */
.page-head{padding:10rem 3rem 4rem;text-align:center;border-bottom:1px solid var(--line);position:relative;overflow:hidden}
.page-head .section-eyebrow{margin-bottom:1.2rem}
.page-head h1{font-weight:400;font-size:clamp(2.2rem,5vw,3.6rem);letter-spacing:.05em}
.page-head p{margin-top:1.2rem;color:var(--ink-soft);max-width:600px;margin-left:auto;margin-right:auto}

/* generic content wrap */
.wrap{max-width:1100px;margin:0 auto;padding:5rem 3rem}
.wrap-narrow{max-width:760px;margin:0 auto;padding:5rem 3rem}

/* reveal animation */
.reveal{opacity:0;transform:translateY(24px);animation:reveal .9s cubic-bezier(.2,.7,.2,1) forwards;animation-delay:var(--d,0s)}
@keyframes reveal{to{opacity:1;transform:none}}
.io-reveal{opacity:0;transform:translateY(30px);transition:opacity .9s,transform .9s}
.io-reveal.in{opacity:1;transform:none}

@media(max-width:860px){
  .nav{padding:1.2rem 1.5rem}
  .nav-links{
    position:fixed;inset:0;background:var(--bg);flex-direction:column;
    align-items:center;justify-content:center;gap:2.4rem;font-size:1.3rem;
    transform:translateX(100%);transition:transform .5s;
  }
  .nav-links.open{transform:none}
  .nav-toggle{display:flex;z-index:1001}
  .strip{grid-template-columns:1fr}
  .strip-item{border-right:0;border-bottom:1px solid var(--line)}
  .feature{grid-template-columns:1fr;padding:4.5rem 1.5rem;gap:2.5rem}
  .feature-visual{min-height:260px}
  .gem-shape{width:200px;height:200px}
  .wrap,.wrap-narrow{padding:3.5rem 1.5rem}
  .page-head{padding:8rem 1.5rem 3rem}
}

/* ===== about page ===== */
.about-intro{display:grid;grid-template-columns:.9fr 1.1fr;gap:4rem;align-items:center}
.portrait-placeholder{
  aspect-ratio:4/5;border:1px solid var(--line);background:var(--panel);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  color:var(--ink-faint);letter-spacing:.2em;text-align:center;gap:.5rem;
}
.portrait-placeholder small{font-size:.7rem;opacity:.6}
.about-portrait img{aspect-ratio:4/5;object-fit:cover;border:1px solid var(--line)}
.about-copy h2{font-weight:400;font-size:clamp(1.7rem,3vw,2.5rem);line-height:1.4;letter-spacing:.03em}
.about-copy p{margin-top:1.4rem;color:var(--ink-soft);font-size:1.05rem}
.values{display:grid;grid-template-columns:repeat(3,1fr);max-width:1100px;margin:0 auto 5rem;gap:0;border:1px solid var(--line)}
.value{padding:3rem 2.4rem;border-right:1px solid var(--line)}
.value:last-child{border-right:0}
.value .num{font-family:var(--serif-en);color:var(--gold);letter-spacing:.2em}
.value h3{font-weight:500;font-size:1.3rem;margin:1rem 0 .8rem;letter-spacing:.05em}
.value p{color:var(--ink-soft);font-size:1rem}

/* ===== course ===== */
.course-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line)}
.flow-step{padding:2.6rem 1.8rem;border-right:1px solid var(--line)}
.flow-step:last-child{border-right:0}
.flow-step .num{font-family:var(--serif-en);color:var(--gold);font-size:1.1rem;letter-spacing:.2em}
.flow-step h3{font-weight:500;font-size:1.25rem;margin:.9rem 0 .7rem;letter-spacing:.06em}
.flow-step p{color:var(--ink-soft);font-size:.96rem}
.course-info{display:grid;grid-template-columns:1fr 1fr;gap:2rem;max-width:1100px;margin:0 auto;padding:0 3rem 5rem}
.info-card{border:1px solid var(--line);padding:2.6rem 2.4rem;background:var(--bg-soft)}
.info-card h3{font-weight:500;font-size:1.4rem;letter-spacing:.06em;margin-bottom:1.6rem;color:var(--gold)}
.info-list{list-style:none}
.info-list li{display:flex;justify-content:space-between;padding:.9rem 0;border-bottom:1px solid var(--line)}
.info-list li:last-child{border-bottom:0}
.info-list span{color:var(--ink-faint);letter-spacing:.15em}
.info-list b{font-weight:400}
.note-list{list-style:none}
.note-list li{position:relative;padding:.6rem 0 .6rem 1.6rem;color:var(--ink-soft);font-size:1rem}
.note-list li::before{content:"◆";position:absolute;left:0;color:var(--gold);font-size:.6rem;top:1rem}

/* ===== works grid ===== */
.works-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem}
.work-card{cursor:pointer;overflow:hidden;position:relative;border:1px solid var(--line);background:var(--panel)}
.work-card img{aspect-ratio:1;object-fit:cover;width:100%;transition:transform .8s cubic-bezier(.2,.7,.2,1)}
.work-card:hover img{transform:scale(1.06)}
.work-card figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:1rem 1.2rem;
  background:linear-gradient(to top,rgba(15,14,12,.92),transparent);
  font-size:.92rem;letter-spacing:.08em;color:var(--ink);
  opacity:0;transform:translateY(8px);transition:.45s;
}
.work-card:hover figcaption{opacity:1;transform:none}
/* placeholder when image missing */
.work-card.ph{aspect-ratio:1;display:flex;align-items:center;justify-content:center}
.work-card.ph img{display:none}
.work-card.ph::before{content:"作品照片";color:var(--ink-faint);letter-spacing:.2em;font-size:.85rem}
.work-card.ph figcaption{position:static;opacity:1;transform:none;background:none;text-align:center;color:var(--ink-faint);padding-top:0}

/* lightbox */
.lightbox{
  position:fixed;inset:0;z-index:5000;background:rgba(10,9,7,.95);
  display:flex;align-items:center;justify-content:center;padding:3rem;
  opacity:0;pointer-events:none;transition:opacity .4s;
}
.lightbox.open{opacity:1;pointer-events:auto}
.lightbox figure{max-width:760px;text-align:center}
.lightbox img{max-height:78vh;width:auto;margin:0 auto;border:1px solid var(--line)}
.lightbox figcaption{margin-top:1.2rem;color:var(--ink-soft);letter-spacing:.1em}
.lb-close{position:absolute;top:1.6rem;right:2rem;background:none;border:0;color:var(--ink);font-size:2.4rem;cursor:pointer;line-height:1}

/* ===== book ===== */
.book-steps{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin-bottom:3rem}
.bstep{display:flex;align-items:center;gap:.7rem;color:var(--ink-soft);font-size:.95rem;letter-spacing:.06em}
.bstep span{
  width:30px;height:30px;border:1px solid var(--gold);color:var(--gold);border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-family:var(--serif-en);font-size:.95rem;
}
.form-embed{border:1px solid var(--line);background:var(--panel);min-height:400px}
.form-embed iframe{display:block;background:transparent}
.book-note{margin-top:1.6rem;text-align:center;color:var(--ink-faint);font-size:.95rem}

/* ===== contact ===== */
.contact-list{border-top:1px solid var(--line)}
.contact-row{
  display:flex;align-items:center;gap:1.5rem;padding:1.8rem .5rem;
  border-bottom:1px solid var(--line);transition:.4s;
}
.contact-row:hover{padding-left:1.5rem;background:var(--bg-soft)}
.c-label{width:120px;color:var(--gold);letter-spacing:.15em;font-size:.9rem}
.c-value{flex:1;font-size:1.15rem;letter-spacing:.04em}
.c-arrow{color:var(--ink-faint);transition:.4s}
.contact-row:hover .c-arrow{color:var(--gold);transform:translateX(6px)}
.contact-foot{margin-top:2rem;color:var(--ink-faint);font-size:.88rem}

@media(max-width:860px){
  .about-intro{grid-template-columns:1fr;gap:2.5rem}
  .values{grid-template-columns:1fr}
  .value{border-right:0;border-bottom:1px solid var(--line)}
  .value:last-child{border-bottom:0}
  .course-flow{grid-template-columns:1fr 1fr}
  .flow-step:nth-child(2){border-right:0}
  .flow-step:nth-child(1),.flow-step:nth-child(2){border-bottom:1px solid var(--line)}
  .course-info{grid-template-columns:1fr;padding:0 1.5rem 4rem}
  .works-grid{grid-template-columns:1fr 1fr;gap:1rem}
  .c-label{width:auto}
  .contact-row{flex-wrap:wrap;gap:.4rem}
}
@media(max-width:520px){
  .works-grid{grid-template-columns:1fr}
}

/* ===== FAQ ===== */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{
  list-style:none;cursor:pointer;padding:1.4rem .3rem;font-size:1.08rem;letter-spacing:.04em;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;transition:color .3s;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--gold);font-size:1.4rem;font-family:var(--serif-en);transition:transform .3s;flex-shrink:0}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item summary:hover{color:var(--gold)}
.faq-item p{padding:0 .3rem 1.5rem;color:var(--ink-soft);font-size:1rem;line-height:1.85}

/* ===== privacy ===== */
.legal-body{color:var(--ink-soft);font-size:1rem;line-height:1.95}
.legal-body h3{color:var(--ink);font-weight:500;font-size:1.15rem;letter-spacing:.05em;margin:2rem 0 .6rem}
.legal-body p{margin-bottom:1rem}
.legal-date{margin-top:2.5rem;color:var(--ink-faint);font-size:.88rem;letter-spacing:.08em}

/* ===== homepage expanded sections ===== */
.home-section{padding:6rem 0;border-top:1px solid var(--line)}
.home-section.alt-bg{background:var(--bg-soft)}
.section-intro{text-align:center;margin-bottom:3.5rem}
.section-intro h2{font-weight:400;font-size:clamp(1.8rem,3.5vw,2.8rem);letter-spacing:.03em;margin-top:1rem}
.section-lead{
  margin-top:1.4rem;color:var(--ink-soft);font-size:1.05rem;line-height:1.95;
  max-width:620px;margin-left:auto;margin-right:auto;
}
.course-chips{display:flex;gap:.9rem;flex-wrap:wrap;justify-content:center;margin-top:2.5rem}
.chip{
  padding:.55rem 1.4rem;border:1px solid var(--line);
  font-size:.88rem;letter-spacing:.12em;color:var(--ink-soft);
  transition:border-color .3s,color .3s;
}
.chip:hover{border-color:var(--gold);color:var(--ink)}
.section-cta{text-align:center;margin-top:2.8rem}
.home-faq-inner{max-width:760px;margin:0 auto;padding:0 3rem}
.about-split{display:grid;grid-template-columns:1fr 1fr;gap:4.5rem;align-items:center}
.about-split-visual .portrait-placeholder{max-width:380px;margin:0 auto;min-height:440px}
.about-split-copy h2{font-weight:400;font-size:clamp(1.8rem,3.5vw,2.8rem);letter-spacing:.03em;margin-top:1rem}

/* works preview placeholder cards on homepage */
.work-card.ph{
  aspect-ratio:1;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:.8rem;cursor:default;
}
.work-card.ph::before{
  content:"作品照片";color:var(--ink-faint);letter-spacing:.2em;font-size:.85rem;
}
.work-card.ph figcaption{
  position:static;opacity:.5;transform:none;background:none;
  text-align:center;color:var(--ink-faint);padding:0;font-size:.82rem;
}

@media(max-width:860px){
  .home-section{padding:4rem 0}
  .about-split{grid-template-columns:1fr;gap:2.5rem}
  .about-split-visual .portrait-placeholder{min-height:320px}
  .home-faq-inner{padding:0 1.5rem}
}