/* ============================================
   江南臻顏 Gangnam Prime — 共用樣式
   白金配色 / White & Gold Palette
   ============================================ */

:root{
  /* white & gold palette — no black */
  --bg:#fbf9f4;          /* ivory white */
  --bg-2:#f4efe5;        /* warm cream */
  --bg-3:#ede6d6;        /* deeper champagne */
  --paper:#ffffff;
  --ink:#3a3328;         /* warm dark brown ink */
  --ink-2:#5a5142;
  --muted:#8c8576;
  --muted-2:#aea797;
  --line:#e6dfce;
  --line-soft:#efe9da;
  --gold:#b8935a;
  --gold-2:#c9a876;
  --gold-3:#d9bf91;
  --gold-soft:#e8d6b1;
  --gold-tint:#f5ecd9;
  --serif:'Noto Serif TC', 'Cormorant Garamond', serif;
  --sans:'Noto Sans TC', 'Inter', system-ui, sans-serif;
  --latin:'Cormorant Garamond', serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-weight:300;-webkit-font-smoothing:antialiased;line-height:1.6}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}

.container{max-width:1280px;margin:0 auto;padding:0 48px}

/* ---------- NAV ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  padding:22px 48px;
  display:flex;align-items:center;gap:40px;
  transition:background .4s ease, padding .3s ease, border-color .3s ease;
  border-bottom:1px solid transparent;
}
.nav.scrolled{background:rgba(251,249,244,.92);backdrop-filter:blur(14px);padding:16px 48px;border-bottom:1px solid var(--line-soft)}
.brand{font-family:var(--latin);letter-spacing:.32em;font-size:13px;font-weight:500;color:var(--ink);margin-right:auto;}
.brand span{color:var(--gold)}
.nav-links{display:flex;gap:48px;list-style:none}
.nav-links a{font-size:13px;letter-spacing:.18em;color:var(--ink-2);font-weight:400;position:relative;transition:color .25s}
.nav-links a:hover,.nav-links a.active{color:var(--gold)}
.nav-links a::after{content:'';position:absolute;left:50%;bottom:-6px;width:0;height:1px;background:var(--gold);transition:all .3s ease}
.nav-links a:hover::after,.nav-links a.active::after{left:0;width:100%}
.nav-cta{
  display:inline-block;
  border:1px solid var(--gold);
  padding:10px 22px;font-size:12px;letter-spacing:.22em;color:var(--gold);
  transition:all .3s ease;background:transparent;
}
.nav-cta:hover{background:var(--gold);color:#fff}
.lang-switch{
  font-size:11px;letter-spacing:.18em;color:var(--muted);text-decoration:none;
  border:1px solid rgba(255,255,255,.15);padding:7px 14px;transition:all .3s;
}
.lang-switch:hover{color:var(--gold);border-color:var(--gold);}

/* ---------- COMMON SECTION HEADERS ---------- */
.section-eyebrow{
  font-family:var(--latin);font-size:12px;letter-spacing:.5em;
  color:var(--gold);text-transform:uppercase;text-align:center;
  margin-bottom:24px;display:flex;align-items:center;justify-content:center;gap:18px;font-weight:500;
}
.section-eyebrow::before,.section-eyebrow::after{content:'';width:28px;height:1px;background:var(--gold);opacity:.6}
.section-title{
  font-family:var(--serif);font-weight:400;
  font-size:clamp(34px,4vw,52px);
  color:var(--ink);text-align:center;letter-spacing:.1em;line-height:1.3;
  margin-bottom:24px;
}
.section-desc{
  font-size:14px;line-height:2;letter-spacing:.06em;color:var(--ink-2);
  text-align:center;max-width:540px;margin:0 auto;
}

/* ---------- BUTTONS ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:16px 38px;font-size:13px;letter-spacing:.28em;font-weight:400;
  transition:all .35s ease;cursor:pointer;
}
.btn-gold{
  background:linear-gradient(135deg,#c9a876 0%, #b8935a 100%);
  color:#fff;border:1px solid var(--gold);
}
.btn-gold:hover{background:linear-gradient(135deg,#d9bf91 0%, #c9a876 100%);transform:translateY(-2px);box-shadow:0 12px 28px rgba(184,147,90,.3)}
.btn-ghost{
  border:1px solid var(--gold);color:var(--gold);background:transparent;
}
.btn-ghost:hover{background:rgba(184,147,90,.08)}

/* ---------- FOOTER ---------- */
footer{background:var(--bg-3);padding:80px 24px 36px;color:var(--ink-2)}
.foot-grid{
  max-width:1140px;margin:0 auto;
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:60px;
  padding-bottom:48px;border-bottom:1px solid var(--line);
}
.foot-brand .brand{font-size:14px;margin-bottom:24px;display:block}
.foot-brand p{font-size:12px;line-height:2;color:var(--muted);letter-spacing:.05em}
.foot-col h5{
  font-family:var(--latin);font-size:11px;letter-spacing:.32em;
  color:var(--gold);text-transform:uppercase;font-weight:600;margin-bottom:24px;
}
.foot-col ul{list-style:none}
.foot-col li{margin-bottom:12px}
.foot-col a{font-size:13px;color:var(--ink-2);letter-spacing:.06em;transition:color .25s}
.foot-col a:hover{color:var(--gold)}
.foot-bottom{
  max-width:1140px;margin:32px auto 0;display:flex;justify-content:space-between;
  font-size:12px;color:var(--muted);letter-spacing:.1em;font-family:var(--latin);
}

/* ---------- FADE-IN ---------- */
.fade-up{opacity:0;transform:translateY(24px);transition:opacity 1s ease, transform 1s ease}
.fade-up.in{opacity:1;transform:translateY(0)}

/* ---------- RESPONSIVE COMMON ---------- */
/* 汉堡菜单按钮 */
.nav-toggle{
  display:none;
  flex-direction:column;justify-content:center;align-items:center;
  width:36px;height:36px;gap:6px;cursor:pointer;
  margin-left:auto;
  background:none;border:none;padding:4px;
}
.nav-toggle span{
  display:block;width:22px;height:1px;
  background:var(--ink);
  transition:all .3s ease;
  transform-origin:center;
}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0;transform:scaleX(0)}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* 移动端抽屉菜单 */
.nav-drawer{
  display:none;
  position:fixed;top:0;left:0;right:0;bottom:0;z-index:49;
  background:rgba(251,249,244,.97);backdrop-filter:blur(16px);
  flex-direction:column;align-items:center;justify-content:center;gap:40px;
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .3s ease, visibility .3s ease;
}
.nav-drawer.open{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
}
.nav-drawer .nav-links{
  display:flex;flex-direction:column;align-items:center;gap:32px;list-style:none;
}
.nav-drawer .nav-links a{
  font-family:var(--serif);font-size:22px;letter-spacing:.2em;color:var(--ink);
  transition:color .25s;
}
.nav-drawer .nav-links a:hover,.nav-drawer .nav-links a.active{color:var(--gold)}
.nav-drawer .nav-cta{
  border:1px solid var(--gold);padding:14px 40px;
  font-size:13px;letter-spacing:.28em;color:var(--gold);
  transition:all .3s;
}
.nav-drawer .nav-cta:hover{background:var(--gold);color:#fff}
.nav-drawer .lang-switch{
  font-size:12px;letter-spacing:.18em;color:var(--muted);
  border:1px solid var(--line);padding:8px 20px;
}

@media (max-width:760px){
  .nav{padding:18px 24px}
  .nav-links{display:none}
  .nav-cta{display:none}
  .nav-toggle{display:flex}
  .nav-drawer{display:flex}
  .container{padding:0 24px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:36px}
  .foot-bottom{flex-direction:column;gap:8px}
}