/* ============ 十九山 Mont XIX · v3 ============ */
:root{
  --ink:#1a1917;
  --ink-soft:#3a3733;
  --paper:#f6f3ee;
  --paper-2:#ece7de;
  --line:#ddd6c9;
  --gold:#b08d57;        /* 深色底上的金 */
  --gold-deep:#7d5f33;   /* 浅色底上的金（AA 对比度） */
  --gold-soft:#c9a86a;
  --white:#fdfdfc;
  --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;
  --ease-out:cubic-bezier(.23,1,.32,1);
}
*{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}
:focus-visible{outline:2px solid var(--gold-deep);outline-offset:3px}
.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;text-wrap:balance}
h2{font-size:clamp(1.7rem,3.8vw,2.7rem)}
h3{font-size:1.2rem}

/* ============ NAV ============ */
.nav{position:fixed;top:0;left:0;width:100%;z-index:50;
  transition:background-color .3s ease,box-shadow .3s ease,backdrop-filter .3s 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 .3s ease;
}
.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 ease;
}
.nav__links a::after{
  content:"";position:absolute;left:0;bottom:-6px;width:100%;height:1px;
  background:var(--gold-soft);transform:scaleX(0);transform-origin:left;
  transition:transform .25s var(--ease-out);
}
@media (hover:hover) and (pointer:fine){
  .nav__links a:hover::after{transform:scaleX(1)}
}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:10px}
.nav__toggle span{width:26px;height:2px;background:var(--white);transition:transform .3s var(--ease-out),opacity .3s ease}

/* 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;min-height:100dvh;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;margin-bottom:1.6rem;opacity:.92}
.hero__title{font-size:clamp(3.2rem,10vw,6rem);letter-spacing:.18em;font-weight:500;line-height:1;text-indent:.18em}
.hero__sub{margin-top:1.5rem;font-size:clamp(.95rem,2vw,1.12rem);letter-spacing:.14em;opacity:.95}
.hero__cta{
  display:inline-block;margin-top:2.8rem;padding:15px 44px;
  border:1px solid rgba(253,253,252,.65);color:var(--white);
  font-size:.9rem;letter-spacing:.22em;text-indent:.22em;
  transition:background-color .25s ease,color .25s ease,border-color .25s ease,transform .15s var(--ease-out);
}
@media (hover:hover) and (pointer:fine){
  .hero__cta:hover{background:var(--white);color:var(--ink);border-color:var(--white)}
}
.hero__cta:active{transform:scale(.97)}

/* ============ SECTIONS ============ */
.section{padding:clamp(72px,11vw,132px) 0}

/* 关于：竖排标题 + 非对称三栏 */
.about{background:var(--paper)}
.about__grid{
  display:grid;
  grid-template-columns:auto minmax(0,.9fr) minmax(0,1.1fr);
  gap:clamp(32px,5vw,64px);
  align-items:center;
}
.about__title{
  writing-mode:vertical-rl;
  font-size:clamp(1.8rem,3.2vw,2.5rem);
  letter-spacing:.28em;line-height:1.9;
  color:var(--ink);white-space:nowrap;
  border-inline-start:1px solid var(--line);
  padding-inline-start:clamp(16px,2vw,28px);
}
.about__title span{display:block;font-size:.62em;color:var(--gold-deep);letter-spacing:.34em}
.about__text p{color:var(--ink-soft);max-width:38ch;text-wrap:pretty}
.about__text p+p{margin-top:1.2rem}
.about__figure{margin:0}
.about__figure img{width:100%;height:100%;object-fit:cover;box-shadow:0 30px 60px -30px rgba(0,0,0,.4)}

/* 设计理念：竖排概念词 + 交替行 */
.design{background:#fbfaf6;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.design__head{text-align:center;max-width:640px;margin:0 auto clamp(48px,7vw,88px)}
.design__lead{color:var(--ink-soft);margin-top:1rem;text-wrap:pretty}
.design__row{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(28px,5vw,72px);align-items:start;
  max-width:920px;margin:0 auto;
}
.design__row+.design__row{margin-top:clamp(56px,8vw,96px)}
.design__row--flip{grid-template-columns:minmax(0,1fr) auto}
.design__row--flip .design__mark{order:2}
.design__mark{
  font-family:var(--serif);writing-mode:vertical-rl;
  font-size:clamp(2rem,3.6vw,2.8rem);letter-spacing:.5em;
  color:var(--ink);border-inline-start:1px solid var(--line);
  padding-inline-start:clamp(14px,1.6vw,22px);
  margin-top:.3em;
}
.design__body h3{margin-bottom:1rem}
.design__body>p{color:var(--ink-soft);max-width:60ch;text-wrap:pretty}
.design__body>p+p{margin-top:1rem}
.design__quote{
  font-family:var(--serif);font-size:1.08rem;line-height:2;
  color:var(--ink);margin:0 0 1.4rem;text-wrap:pretty;
}
.design__quote span{
  display:block;font-family:var(--sans);font-size:.8rem;
  letter-spacing:.2em;color:var(--gold-deep);margin-top:.5rem;
}
.design__pairs{margin-top:1.8rem;display:grid;gap:1.5rem}
.pair{border-top:1px solid var(--line);padding-top:1.1rem}
.pair h4{font-family:var(--serif);font-weight:500;font-size:1.05rem;margin-bottom:.4rem}
.pair p{color:var(--ink-soft);font-size:.95rem;max-width:60ch;text-wrap:pretty}

/* 空间：左对齐标题 + 瀑布流 */
.gallery{background:var(--paper-2)}
.gallery__head{max-width:640px;margin-bottom:clamp(40px,6vw,64px)}
.gallery__lead{color:var(--ink-soft);margin-top:.9rem}
.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 .5s var(--ease-out)}
@media (hover:hover) and (pointer:fine){
  .masonry__item:hover img{transform:scale(1.03)}
}

/* 客房：窗宽规格清单 */
.rooms{background:var(--paper)}
.rooms__head{max-width:640px;margin-bottom:clamp(40px,6vw,64px)}
.rooms__lead{color:var(--ink-soft);margin-top:.9rem}
.rooms__list{max-width:920px}
.room{
  display:grid;grid-template-columns:minmax(150px,auto) minmax(0,1fr);
  gap:clamp(24px,4vw,64px);align-items:start;
  border-top:1px solid var(--line);
  padding:clamp(28px,4vw,40px) 0;
}
.room__spec{display:flex;flex-direction:column;gap:.2rem}
.room__spec strong{
  font-family:var(--serif);font-weight:500;font-size:clamp(2.4rem,4.5vw,3.4rem);
  line-height:1;color:var(--ink);
}
.room__spec i{font-style:normal;font-size:.45em;margin-left:.15em}
.room__spec span{font-size:.8rem;letter-spacing:.2em;color:var(--gold-deep)}
.room__info h3{margin-bottom:.55rem}
.room__info p{color:var(--ink-soft);max-width:58ch;text-wrap:pretty}
.room__meta{font-size:.85rem;color:var(--gold-deep);margin-top:.7rem;letter-spacing:.06em}
.rooms__note{
  max-width:920px;margin-top:clamp(28px,4vw,40px);
  border-top:1px solid var(--line);padding-top:clamp(28px,4vw,40px);
  font-family:var(--serif);color:var(--ink);text-wrap:pretty;
}

/* 体验：深色底，左侧引言 + 右侧清单 */
.features{background:var(--ink);color:var(--paper)}
.features__layout{
  display:grid;
  grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);
  gap:clamp(40px,7vw,96px);
  align-items:start;
}
.features__intro{position:sticky;top:120px}
.features__intro h2{color:var(--paper)}
.features__intro p{color:rgba(246,243,238,.72);margin-top:1.2rem;max-width:30ch}
.features__list{
  display:grid;grid-template-columns:1fr 1fr;
  gap:clamp(28px,4vw,44px) clamp(28px,4vw,52px);
}
.feature{border-top:1px solid rgba(246,243,238,.18);padding-top:20px}
.feature h3{color:var(--paper);margin-bottom:.55rem}
.feature p{color:rgba(246,243,238,.72);font-size:.95rem}

/* 预订 */
.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 2.6rem;text-wrap:pretty}
.contact__methods{display:flex;justify-content:center;gap:clamp(30px,8vw,80px);flex-wrap:wrap}
.contact__item{display:flex;flex-direction:column;gap:.4rem}
.contact__item span{font-size:.8rem;letter-spacing:.22em;color:var(--gold-deep)}
.contact__item strong{font-family:var(--serif);font-size:1.2rem;font-weight:500}

/* ============ FOOTER ============ */
.footer{background:var(--ink);color:var(--paper);text-align:center;padding:52px 20px 40px;border-top:1px solid rgba(246,243,238,.1)}
.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,.62);margin-bottom:.6rem}
.footer__beian{font-size:.82rem;display:flex;justify-content:center;align-items:center;gap:6px 22px;flex-wrap:wrap}
.footer__beian a{color:rgba(246,243,238,.72);letter-spacing:.04em;transition:color .25s ease;display:inline-flex;align-items:center;gap:6px}
.footer__beian a:hover{color:var(--gold-soft)}
.footer__badge{width:15px;height:15px;flex:none;opacity:.85;vertical-align:middle}

/* ============ 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:opacity .25s ease,visibility .25s ease}
.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);
  transform:scale(.96);transition:transform .25s var(--ease-out)}
.lightbox.open img{transform:scale(1)}
.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;padding:6px 10px}
.lightbox__close:hover{opacity:1}
.lightbox__close:active{transform:scale(.94)}

/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(22px);
  transition:opacity .55s ease-out,transform .55s var(--ease-out)}
.reveal.in{opacity:1;transform:none}
.stagger>*{opacity:0;transform:translateY(16px);
  transition:opacity .5s ease-out,transform .5s var(--ease-out)}
.reveal.in.stagger>*,.reveal.in .stagger>*{opacity:1;transform:none}
.stagger>*:nth-child(1){transition-delay:.03s}
.stagger>*:nth-child(2){transition-delay:.08s}
.stagger>*:nth-child(3){transition-delay:.13s}
.stagger>*:nth-child(4){transition-delay:.18s}
.stagger>*:nth-child(5){transition-delay:.23s}
.stagger>*:nth-child(6){transition-delay:.28s}
.stagger>*:nth-child(7){transition-delay:.33s}
.stagger>*:nth-child(8){transition-delay:.38s}
.stagger>*:nth-child(9){transition-delay:.43s}

/* ============ RESPONSIVE ============ */
@media(max-width:980px){
  .masonry{columns:2}
  .about__grid{grid-template-columns:1fr;gap:32px}
  .about__title{
    writing-mode:horizontal-tb;white-space:normal;
    border-inline-start:0;padding-inline-start:0;
    border-top:1px solid var(--line);padding-top:20px;
    letter-spacing:.08em;line-height:1.4;
  }
  .about__title span{display:inline;margin-left:.6em;font-size:.6em;letter-spacing:.2em}
  .features__layout{grid-template-columns:1fr}
  .features__intro{position:static}
  .design__row,.design__row--flip{grid-template-columns:1fr;gap:20px}
  .design__row--flip .design__mark{order:0}
  .design__mark{
    writing-mode:horizontal-tb;
    border-inline-start:0;padding-inline-start:0;
    border-top:1px solid var(--line);padding-top:16px;
    margin-top:0;letter-spacing:.3em;
  }
  .room{grid-template-columns:1fr;gap:14px}
}
@media(max-width:680px){
  .nav__links{
    position:fixed;top:0;right:0;height:100dvh;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 .35s var(--ease-out);
  }
  .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)}
  .masonry{columns:1}
  .features__list{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none !important;transition-duration:.01ms !important;scroll-behavior:auto}
  .reveal,.stagger>*{opacity:1;transform:none;transition:none}
}