/* ============================================================
   TAI & KHAN PARTNERSHIP — Design System
   Charcoal (曜黑) + Champagne Gold (香槟金)
   Display: Cormorant Garamond · Body: Manrope
   ============================================================ */

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
img,picture,svg,video{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none;padding:0}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}
.skip-link{position:fixed;top:12px;left:12px;z-index:400;background:var(--gold);color:var(--ink);padding:11px 18px;border-radius:3px;font-size:.78rem;font-weight:700;letter-spacing:.04em;transform:translateY(-180%);transition:transform .3s var(--ease)}
.skip-link:focus-visible{transform:none;outline-offset:2px}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- Tokens ---------- */
:root{
  --ink:#0E0E10;         /* base near-black */
  --ink-1:#111114;
  --ink-2:#16161A;       /* raised surface */
  --ink-3:#1C1C21;       /* cards */
  --ink-4:#24242B;       /* hover */
  --paper:#F4F1EA;       /* primary warm off-white */
  --paper-2:#E7E2D7;
  --paper-dim:#B4ADA1;   /* muted text */
  --paper-faint:#877F72; /* faint / captions */
  --gold:#C9A15E;        /* champagne gold accent */
  --gold-2:#E4CE9E;      /* pale champagne highlight */
  --gold-deep:#9A7A3E;
  --line:rgba(201,161,94,.26);
  --line-soft:rgba(244,241,234,.10);
  --line-faint:rgba(244,241,234,.06);
  --shadow:0 30px 70px -30px rgba(0,0,0,.7);

  --header-h:80px;
  --wrap:1280px;
  --pad:clamp(20px,5vw,72px);
  --gutter:clamp(24px,4vw,56px);

  --f-display:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --f-body:"Manrope",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;

  --ease:cubic-bezier(.22,.7,.2,1);
}

/* ---------- Base ---------- */
body{
  font-family:var(--f-body);
  font-weight:400;
  font-size:clamp(15px,.5vw + 14px,17px);
  line-height:1.72;
  color:var(--paper);
  background:var(--ink);
  overflow-x:hidden;
  position:relative;
}
/* atmospheric depth: faint gold glows + fine grain */
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(80% 55% at 82% -8%,rgba(201,161,94,.10),transparent 60%),
    radial-gradient(70% 50% at -8% 12%,rgba(201,161,94,.05),transparent 55%);
}
main{position:relative;z-index:2}

/* ---------- Typography ---------- */
h1,h2,h3,h4{font-family:var(--f-display);font-weight:500;line-height:1.04;letter-spacing:.005em}
.display{
  font-family:var(--f-display);font-weight:500;
  font-size:clamp(2.9rem,8vw,6.6rem);line-height:.98;letter-spacing:-.01em;
}
.h1{font-size:clamp(2.6rem,6vw,4.6rem);line-height:1.02}
.h2{font-size:clamp(2rem,4.4vw,3.4rem);line-height:1.05}
.h3{font-size:clamp(1.5rem,2.6vw,2.15rem);line-height:1.1}
.serif-italic{font-style:italic;font-weight:400}
.lede{font-size:clamp(1.12rem,1.6vw,1.4rem);line-height:1.6;color:var(--paper-2);font-weight:300}
.muted{color:var(--paper-dim)}
.faint{color:var(--paper-faint)}
strong{font-weight:600;color:var(--paper)}

/* eyebrow / kicker */
.eyebrow{
  display:inline-flex;align-items:center;gap:.7em;
  font-family:var(--f-body);font-size:.72rem;font-weight:600;
  letter-spacing:.28em;text-transform:uppercase;color:var(--gold);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold);opacity:.7}
.eyebrow.center{justify-content:center}
.eyebrow.no-rule::before{display:none}

.index-num{font-family:var(--f-display);color:var(--gold);font-weight:500;font-variant-numeric:lining-nums}

/* ---------- Layout ---------- */
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--pad);width:100%}
.wrap-wide{max-width:1500px;margin-inline:auto;padding-inline:var(--pad);width:100%}
section{position:relative}
.section{padding-block:clamp(84px,12vh,156px)}
.section-sm{padding-block:clamp(52px,7vh,96px)}
.bleed{width:100%}
.divider{height:1px;background:var(--line-soft);border:0}
.rule-gold{height:1px;background:linear-gradient(90deg,var(--gold),transparent);border:0}

/* ---------- Buttons & links ---------- */
.btn{
  --bg:transparent;--fg:var(--paper);--bd:rgba(244,241,234,.28);
  display:inline-flex;align-items:center;gap:.7em;
  padding:1.02em 1.7em;background:var(--bg);color:var(--fg);
  border:1px solid var(--bd);border-radius:2px;
  font-family:var(--f-body);font-size:.74rem;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;cursor:pointer;
  position:relative;overflow:hidden;transition:color .5s var(--ease),border-color .5s var(--ease);
}
.btn svg{width:16px;height:16px;position:relative;z-index:1;transition:transform .5s var(--ease)}
.btn span{position:relative;z-index:1}
.btn::after{content:"";position:absolute;inset:0;background:var(--gold);transform:translateY(101%);transition:transform .5s var(--ease);z-index:0}
.btn:hover{color:var(--ink);border-color:var(--gold)}
.btn:hover::after{transform:translateY(0)}
.btn:hover svg{transform:translate(3px,-3px)}
.btn--solid{--bg:var(--gold);--fg:var(--ink);--bd:var(--gold)}
.btn--solid::after{background:var(--gold-2)}
.btn--solid:hover{color:var(--ink);border-color:var(--gold-2)}
.btn--ghost{--bd:var(--line)}

/* arrow text link */
.link-arrow{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--f-body);font-size:.74rem;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--gold);
  padding-bottom:.35em;position:relative;width:fit-content;
}
.link-arrow svg{width:15px;height:15px;transition:transform .45s var(--ease)}
.link-arrow::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:100%;background:var(--gold);transform:scaleX(.28);transform-origin:left;transition:transform .45s var(--ease)}
.link-arrow:hover::after{transform:scaleX(1)}
.link-arrow:hover svg{transform:translate(4px,-4px)}

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header{
  position:fixed;top:0;left:0;width:100%;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  gap:24px;padding:18px var(--pad);
  transition:background .5s var(--ease),padding .5s var(--ease),border-color .5s var(--ease),backdrop-filter .5s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header::before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(10,10,12,.6),transparent);opacity:1;transition:opacity .5s var(--ease)}
.site-header.scrolled{background:rgba(12,12,14,.82);backdrop-filter:blur(14px) saturate(1.1);-webkit-backdrop-filter:blur(14px) saturate(1.1);border-bottom-color:var(--line-soft);padding-block:12px}
.site-header.scrolled::before{opacity:0}

/* logo lockup */
.brand{display:inline-flex;align-items:center;gap:14px;flex-shrink:0}
.brand__mark{width:42px;height:42px;flex-shrink:0}
.brand__mark rect,.brand__mark line,.brand__mark path{transition:stroke .5s var(--ease)}
.brand__word{display:flex;flex-direction:column;line-height:1}
.brand__name{font-family:var(--f-display);font-size:1.34rem;font-weight:600;letter-spacing:.02em;color:var(--paper)}
.brand__name em{font-style:normal;color:var(--gold)}
.brand__sub{font-family:var(--f-body);font-size:.53rem;font-weight:600;letter-spacing:.34em;text-transform:uppercase;color:var(--paper-dim);margin-top:5px}

/* desktop nav */
.nav{display:flex;align-items:center;gap:clamp(14px,1.8vw,30px)}
.nav__link{
  font-family:var(--f-body);font-size:.78rem;font-weight:500;letter-spacing:.06em;
  color:var(--paper-2);position:relative;padding:6px 0;transition:color .35s var(--ease);
}
.nav__link::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;background:var(--gold);transform:scaleX(0);transform-origin:center;transition:transform .4s var(--ease)}
.nav__link:hover{color:var(--paper)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--gold)}
.nav__link[aria-current="page"]::after{transform:scaleX(1);opacity:.9}

.header__cta{display:flex;align-items:center;gap:18px}
.header__phone{display:inline-flex;align-items:center;gap:8px;font-size:.8rem;font-weight:600;letter-spacing:.02em;color:var(--paper);white-space:nowrap}
.header__phone svg{width:15px;height:15px;color:var(--gold)}

/* burger */
.burger{display:none;width:44px;height:44px;background:none;border:1px solid var(--line-soft);border-radius:2px;cursor:pointer;position:relative;flex-shrink:0}
.burger span{position:absolute;left:11px;right:11px;height:1.5px;background:var(--paper);transition:transform .4s var(--ease),opacity .3s var(--ease)}
.burger span:nth-child(1){top:15px}
.burger span:nth-child(2){top:21px}
.burger span:nth-child(3){top:27px}
body.nav-open .burger span:nth-child(1){transform:translateY(6px) rotate(45deg)}
body.nav-open .burger span:nth-child(2){opacity:0}
body.nav-open .burger span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* mobile overlay menu */
.mobile-nav{
  position:fixed;inset:0;z-index:99;background:var(--ink-1);
  display:flex;flex-direction:column;justify-content:center;
  padding:calc(var(--header-h) + 20px) var(--pad) 40px;
  opacity:0;visibility:hidden;transform:translateY(-2%);
  transition:opacity .5s var(--ease),transform .5s var(--ease),visibility .5s;
}
.mobile-nav::before{content:"";position:absolute;inset:0;background:radial-gradient(90% 60% at 80% 0,rgba(201,161,94,.12),transparent 60%);pointer-events:none}
body.nav-open{overflow:hidden}
body.nav-open .mobile-nav{opacity:1;visibility:visible;transform:none}
.mobile-nav__list{display:flex;flex-direction:column;gap:2px;position:relative}
.mobile-nav__link{
  font-family:var(--f-display);font-size:clamp(1.9rem,7vw,2.9rem);font-weight:500;
  color:var(--paper);padding:.18em 0;display:flex;align-items:baseline;gap:.5em;
  border-bottom:1px solid var(--line-faint);transition:color .3s var(--ease),padding-left .4s var(--ease);
}
.mobile-nav__link .num{font-size:.7rem;font-family:var(--f-body);letter-spacing:.2em;color:var(--gold);opacity:.7}
.mobile-nav__link[aria-current="page"]{color:var(--gold)}
.mobile-nav__link:hover{color:var(--gold);padding-left:12px}
.mobile-nav__foot{margin-top:auto;padding-top:32px;display:flex;flex-direction:column;gap:10px;color:var(--paper-dim);font-size:.85rem}
.mobile-nav__foot a{color:var(--paper)}
.mobile-nav__foot .gold{color:var(--gold)}

/* ============================================================
   HERO (shared)
   ============================================================ */
.hero{position:relative;min-height:100svh;display:flex;isolation:isolate;overflow:hidden}
.hero__media{position:absolute;inset:0;z-index:-2}
.hero__media img{width:100%;height:100%;object-fit:cover;object-position:center}
.hero__media::after{ /* scrim */
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(10,10,12,.55) 0%,rgba(10,10,12,.35) 32%,rgba(10,10,12,.72) 78%,var(--ink) 100%),
             linear-gradient(90deg,rgba(10,10,12,.6),transparent 55%);
}
.hero__inner{position:relative;z-index:1;width:100%;align-self:flex-end;padding-bottom:clamp(40px,7vh,88px);padding-top:calc(var(--header-h) + 24px)}

/* ---------- Home hero specifics ---------- */
.hero-home .hero__inner{align-self:center;padding-top:var(--header-h)}
.hero-home__kicker{margin-bottom:26px}
.hero-home h1{font-size:clamp(3.2rem,9.4vw,8rem);font-weight:500;line-height:.94;letter-spacing:-.015em;color:var(--paper);max-width:14ch}
.hero-home h1 .amp{font-style:italic;color:var(--gold);font-weight:400}
.hero-home__slogan{font-family:var(--f-display);font-style:italic;font-size:clamp(1.3rem,2.6vw,2.1rem);color:var(--paper-2);margin-top:.5em}
.hero-home__meta{margin-top:clamp(30px,5vh,52px);max-width:44ch;color:var(--paper-dim);font-size:1.02rem}
.hero-home__actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:34px}

/* promise strip pinned to hero bottom */
.hero-promise{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,transparent,rgba(10,10,12,.5));
}
.hero-promise__grid{max-width:var(--wrap);margin-inline:auto;padding:20px var(--pad);display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.hero-promise__item{display:flex;align-items:center;gap:14px;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;color:var(--paper-2)}
.hero-promise__item svg{width:20px;height:20px;color:var(--gold);flex-shrink:0}
.hero-promise__item + .hero-promise__item{padding-left:24px;border-left:1px solid var(--line-soft)}

/* scroll cue */
.scroll-cue{position:absolute;left:50%;bottom:96px;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--paper-dim);font-size:.62rem;letter-spacing:.3em;text-transform:uppercase}
.scroll-cue .bar{width:1px;height:44px;background:linear-gradient(var(--gold),transparent);overflow:hidden;position:relative}
.scroll-cue .bar::after{content:"";position:absolute;top:-50%;left:0;width:100%;height:50%;background:var(--gold-2);animation:cue 2.4s var(--ease) infinite}
@keyframes cue{0%{top:-50%}60%,100%{top:100%}}

/* ---------- Inner page hero ---------- */
.hero-inner{min-height:100svh}
.hero-inner .hero__inner{align-self:flex-end}
.hero-inner__crumb{display:flex;gap:.6em;align-items:center;font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--paper-dim);margin-bottom:22px}
.hero-inner__crumb a:hover{color:var(--gold)}
.hero-inner__crumb .sep{color:var(--gold);opacity:.6}
.hero-inner h1{font-size:clamp(2.8rem,7vw,5.6rem);color:var(--paper);max-width:16ch}
.hero-inner__sub{margin-top:22px;max-width:52ch;color:var(--paper-2)}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{position:relative;z-index:2;background:var(--ink-1);border-top:1px solid var(--line-soft);overflow:hidden}
.site-footer::before{content:"";position:absolute;inset:0;background:radial-gradient(70% 90% at 88% 0,rgba(201,161,94,.07),transparent 60%);pointer-events:none}
.footer__top{padding-block:clamp(56px,8vh,96px);display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:var(--gutter)}
.footer__brand .brand{margin-bottom:22px}
.footer__brand p{color:var(--paper-dim);max-width:34ch;font-size:.95rem}
.footer__maps{display:flex;gap:12px;margin-top:24px}
.footer__col h3{font-family:var(--f-body);font-size:.72rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin-bottom:20px}
.footer__col ul{display:flex;flex-direction:column;gap:12px}
.footer__col a,.footer__contact a{color:var(--paper-2);font-size:.92rem;transition:color .3s var(--ease)}
.footer__col a:hover{color:var(--gold)}
.footer__contact{display:flex;flex-direction:column;gap:16px}
.footer__contact li{display:flex;gap:12px;color:var(--paper-dim);font-size:.92rem;line-height:1.5}
.footer__contact svg{width:17px;height:17px;color:var(--gold);flex-shrink:0;margin-top:3px}
.footer__bottom{border-top:1px solid var(--line-faint);padding-block:26px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;align-items:center;font-size:.8rem;color:var(--paper-faint)}
.footer__bottom a{color:var(--paper-dim)}
.footer__sign a{color:var(--gold)}
.footer__sign a:hover{text-decoration:underline}

/* ============================================================
   FLOATING WHATSAPP
   ============================================================ */
.wa-float{
  position:fixed;right:clamp(16px,3vw,30px);bottom:clamp(16px,3vw,30px);z-index:200;
  width:60px;height:60px;border-radius:50%;background:#25D366;
  display:grid;place-items:center;box-shadow:0 12px 30px -6px rgba(37,211,102,.5),0 4px 12px rgba(0,0,0,.3);
  transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.wa-float svg{width:32px;height:32px;fill:#fff}
.wa-float::before,.wa-float::after{content:"";position:absolute;inset:0;border-radius:50%;border:2px solid #25D366;animation:wa-pulse 2.6s var(--ease) infinite}
.wa-float::after{animation-delay:1.3s}
.wa-float:hover{transform:scale(1.08)}
@keyframes wa-pulse{0%{transform:scale(1);opacity:.7}100%{transform:scale(1.9);opacity:0}}
.wa-float__label{position:absolute;right:74px;top:50%;transform:translateY(-50%) translateX(8px);white-space:nowrap;background:var(--ink-3);color:var(--paper);border:1px solid var(--line-soft);padding:9px 15px;border-radius:3px;font-size:.76rem;letter-spacing:.03em;opacity:0;pointer-events:none;transition:opacity .35s var(--ease),transform .35s var(--ease)}
.wa-float:hover .wa-float__label{opacity:1;transform:translateY(-50%) translateX(0)}

/* ============================================================
   REVEAL ANIMATIONS
   ============================================================ */
html.js [data-reveal]{opacity:0;transform:translateY(22px);transition:opacity 1s var(--ease),transform 1s var(--ease);transition-delay:var(--d,0ms)}
html.js [data-reveal="fade"]{transform:none}
html.js [data-reveal="left"]{transform:translateX(-26px)}
html.js [data-reveal="scale"]{transform:scale(1.04);transition:opacity 1.2s var(--ease),transform 1.2s var(--ease)}
html.js [data-reveal].in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html.js [data-reveal]{opacity:1!important;transform:none!important;transition:none!important}
  .scroll-cue .bar::after,.wa-float::before,.wa-float::after{animation:none}
  *{scroll-behavior:auto!important}
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1200px){.header__phone{display:none}}
@media (max-width:1024px){
  :root{--header-h:70px}
  .nav,.header__phone{display:none}
  .burger{display:block}
  .footer__top{grid-template-columns:1fr 1fr}
  .footer__brand{grid-column:1/-1}
}
@media (max-width:640px){
  :root{--header-h:64px}
  .brand__sub{display:none}
  .brand__name{font-size:1.18rem}
  .hero-promise__grid{grid-template-columns:1fr;gap:10px;padding-block:16px}
  .hero-promise__item + .hero-promise__item{padding-left:0;border-left:0}
  .hero-promise__item{font-size:.74rem}
  .scroll-cue{display:none}
  .footer__top{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column;align-items:flex-start}
  .btn{width:100%;justify-content:center}
  .hero-home__actions .btn{width:auto}
}