/* ============ 十九山 Mont XIX ============ */
:root{
  --ink:#1a1917;
  --ink-soft:#3a3733;
  --paper:#f6f3ee;
  --paper-2:#ece7de;
  --line:#ddd6c9;
  --gold:#b08d57;
  --gold-soft:#c9a86a;
  --white:#ffffff;
  --serif:"Songti SC","STSong","SimSun-ExtB","Noto Serif SC",Georgia,"Times New Roman",serif;
  --sans:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",Arial,sans-serif;
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(20px,5vw,48px)}

/* headings */
h1,h2,h3{font-family:var(--serif);font-weight:500;letter-spacing:.02em;line-height:1.25}
h2{font-size:clamp(1.6rem,3.6vw,2.6rem)}
h3{font-size:1.2rem}
.eyebrow{
  font-size:.78rem;letter-spacing:.32em;text-transform:uppercase;
  color:var(--gold);margin-bottom:1rem;font-weight:600;
}
.eyebrow--light{color:var(--gold-soft)}

/* ============ NAV ============ */
.nav{position:fixed;top:0;left:0;width:100%;z-index:50;transition:.4s ease}
.nav__inner{
  max-width:var(--maxw);margin:0 auto;
  padding:22px clamp(20px,5vw,48px);
  display:flex;align-items:center;justify-content:space-between;
}
.nav__brand{
  font-family:var(--serif);font-size:1.5rem;color:var(--white);
  display:flex;align-items:baseline;gap:.6rem;letter-spacing:.05em;
  transition:color .4s;
}
.nav__brand span{font-size:.7rem;letter-spacing:.28em;opacity:.85;font-family:var(--sans)}
.nav__links{display:flex;gap:2.2rem}
.nav__links a{
  color:var(--white);font-size:.92rem;letter-spacing:.06em;position:relative;
  transition:color .3s;
}
.nav__links a::after{
  content:"";position:absolute;left:0;bottom:-6px;width:0;height:1px;
  background:var(--gold-soft);transition:width .3s;
}
.nav__links a:hover::after{width:100%}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__toggle span{width:26px;height:2px;background:var(--white);transition:.3s}

/* scrolled state */
.nav.scrolled{background:rgba(246,243,238,.94);backdrop-filter:blur(10px);box-shadow:0 1px 0 var(--line)}
.nav.scrolled .nav__brand,.nav.scrolled .nav__links a{color:var(--ink)}
.nav.scrolled .nav__toggle span{background:var(--ink)}

/* ============ HERO ============ */
.hero{position:relative;height:100vh;min-height:560px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.hero__media{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.hero__overlay{position:absolute;inset:0;z-index:1;
  background:linear-gradient(180deg,rgba(20,18,16,.42) 0%,rgba(20,18,16,.18) 40%,rgba(20,18,16,.55) 100%)}
.hero__content{position:relative;z-index:2;text-align:center;color:var(--white);padding:0 20px}
.hero__eyebrow{font-size:.85rem;letter-spacing:.4em;text-transform:uppercase;margin-bottom:1.4rem;opacity:.92}
.hero__title{font-family:var(--serif);font-size:clamp(3.2rem,11vw,7rem);letter-spacing:.14em;font-weight:500;line-height:1}
.hero__sub{margin-top:1.4rem;font-size:clamp(.95rem,2vw,1.15rem);letter-spacing:.08em;opacity:.95}
.hero__cta{
  display:inline-block;margin-top:2.6rem;padding:14px 40px;
  border:1px solid rgba(255,255,255,.6);color:var(--white);
  font-size:.9rem;letter-spacing:.18em;transition:.35s;
}
.hero__cta:hover{background:var(--white);color:var(--ink);border-color:var(--white)}
.hero__scroll{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);z-index:2}
.hero__scroll span{display:block;width:22px;height:36px;border:1.5px solid rgba(255,255,255,.65);border-radius:12px;position:relative}
.hero__scroll span::after{content:"";position:absolute;top:7px;left:50%;transform:translateX(-50%);width:3px;height:7px;border-radius:2px;background:var(--white);animation:scroll 1.8s infinite}
@keyframes scroll{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}80%{opacity:0;transform:translate(-50%,12px)}}

/* ============ SECTIONS ============ */
.section{padding:clamp(64px,10vw,120px) 0}
.section__head{text-align:center;max-width:640px;margin:0 auto clamp(40px,6vw,64px)}
.about{background:var(--paper)}
.about__grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,6vw,72px);align-items:center}
.about__text p{color:var(--ink-soft);margin-top:1.2rem;max-width:44ch}
.about__text h2{margin-top:.4rem}
.about__figure img{width:100%;height:100%;object-fit:cover;box-shadow:0 30px 60px -30px rgba(0,0,0,.4)}

/* masonry */
.gallery{background:var(--paper-2)}
.masonry{columns:3;column-gap:16px}
.masonry__item{break-inside:avoid;margin-bottom:16px;overflow:hidden;cursor:zoom-in;background:var(--ink)}
.masonry__item img{width:100%;transition:transform .7s cubic-bezier(.2,.8,.2,1),opacity .3s}
.masonry__item:hover img{transform:scale(1.05)}

/* features */
.features{background:var(--ink);color:var(--paper)}
.features .eyebrow{color:var(--gold-soft)}
.features h2{color:var(--paper)}
.features__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(28px,4vw,48px)}
.feature{border-top:1px solid rgba(255,255,255,.16);padding-top:22px}
.feature__no{font-family:var(--serif);font-size:1.1rem;color:var(--gold-soft);letter-spacing:.1em}
.feature h3{margin:.8rem 0 .6rem;color:var(--paper)}
.feature p{color:rgba(246,243,238,.66);font-size:.95rem}

/* contact */
.contact{background:var(--paper);text-align:center}
.contact__inner{max-width:680px;margin:0 auto}
.contact__lead{color:var(--ink-soft);margin:1.2rem auto 2.4rem;max-width:46ch}
.contact__methods{display:flex;justify-content:center;gap:clamp(30px,8vw,80px);flex-wrap:wrap;margin-bottom:1.6rem}
.contact__item{display:flex;flex-direction:column;gap:.4rem}
.contact__item span{font-size:.78rem;letter-spacing:.24em;text-transform:uppercase;color:var(--gold)}
.contact__item strong{font-family:var(--serif);font-size:1.15rem;font-weight:500}
.contact__note{font-size:.8rem;color:#a49c8d}

/* ============ FOOTER ============ */
.footer{background:var(--ink);color:var(--paper);text-align:center;padding:52px 20px 40px}
.footer__brand{font-family:var(--serif);font-size:1.3rem;letter-spacing:.1em;margin-bottom:1rem}
.footer__copy{font-size:.82rem;color:rgba(246,243,238,.5);margin-bottom:.6rem}
.footer__beian{font-size:.82rem}
.footer__beian a{color:rgba(246,243,238,.7);letter-spacing:.04em;transition:color .3s}
.footer__beian a:hover{color:var(--gold-soft)}

/* ============ LIGHTBOX ============ */
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(15,14,12,.94);
  display:flex;align-items:center;justify-content:center;padding:5vw;
  opacity:0;visibility:hidden;transition:.35s}
.lightbox.open{opacity:1;visibility:visible}
.lightbox img{max-width:92vw;max-height:88vh;object-fit:contain;box-shadow:0 20px 60px rgba(0,0,0,.6)}
.lightbox__close{position:absolute;top:24px;right:32px;background:none;border:0;color:#fff;font-size:2.4rem;line-height:1;cursor:pointer;opacity:.8}
.lightbox__close:hover{opacity:1}

/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s ease,transform .9s cubic-bezier(.2,.8,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ============ RESPONSIVE ============ */
@media(max-width:900px){
  .masonry{columns:2}
  .features__grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:680px){
  .nav__links{
    position:fixed;top:0;right:0;height:100vh;width:72%;max-width:320px;
    background:rgba(20,18,16,.97);backdrop-filter:blur(8px);
    flex-direction:column;justify-content:center;align-items:center;gap:2rem;
    transform:translateX(100%);transition:transform .4s ease;
  }
  .nav__links.open{transform:translateX(0)}
  .nav__links a{color:#fff !important;font-size:1.1rem}
  .nav__toggle{display:flex;z-index:60}
  .nav__toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav__toggle.active span:nth-child(2){opacity:0}
  .nav__toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .about__grid{grid-template-columns:1fr}
  .masonry{columns:1}
  .features__grid{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none !important;scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
}