/* ── ARU · SHARED STYLES ── */
:root{
  --bg:#000;--bg2:#0a0a0a;--bg3:#111;--bg4:#161616;
  --surface:rgba(255,255,255,.04);--border:rgba(255,255,255,.07);
  --text:#f0ece6;--text2:#8a8880;--text3:#4a4a46;
  --r:16px;
  --en:'DM Sans',-apple-system,sans-serif;
  --serif:'Cormorant Garamond',Georgia,serif;
  --zh:'Noto Serif SC','PingFang SC',sans-serif;
}
[data-theme="light"]{
  --bg:#fafaf8;--bg2:#f2f0eb;--bg3:#e8e4da;--bg4:#dedad0;
  --surface:rgba(0,0,0,.03);--border:rgba(0,0,0,.08);
  --text:#1a1a17;--text2:#5a5a52;--text3:#9a9a8e;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--en);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;transition:background .4s,color .4s;overflow-x:hidden}

/* NAV */
nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 52px;height:54px;background:rgba(0,0,0,.75);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border);transition:background .4s}
[data-theme="light"] nav{background:rgba(250,250,248,.8)}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.brand-name{font-family:var(--serif);font-size:20px;font-weight:500;letter-spacing:4px;color:var(--text)}
.nav-links{display:flex;gap:32px;list-style:none}
.nav-links a{font-size:13px;color:var(--text2);text-decoration:none;transition:color .2s;letter-spacing:.3px}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-right{display:flex;align-items:center;gap:12px}
.lang-btn{padding:6px 14px;background:var(--surface);border:1px solid var(--border);border-radius:980px;font-size:12px;font-weight:500;color:var(--text2);cursor:pointer;transition:all .2s;font-family:var(--en);letter-spacing:.5px}
.lang-btn:hover{color:var(--text);border-color:var(--text3)}
.theme-btn{width:34px;height:18px;background:var(--border);border-radius:9px;border:none;cursor:pointer;position:relative;transition:background .3s;flex-shrink:0}
.theme-btn::after{content:'';position:absolute;left:2px;top:2px;width:14px;height:14px;border-radius:50%;background:var(--text2);transition:transform .3s,background .3s}
[data-theme="light"] .theme-btn::after{transform:translateX(16px);background:var(--text)}
.nav-cta{padding:8px 20px;background:var(--text);color:var(--bg);border:none;border-radius:980px;font-family:var(--en);font-size:13px;font-weight:500;cursor:pointer;text-decoration:none;transition:opacity .2s;white-space:nowrap}
.nav-cta:hover{opacity:.8}

/* BUTTONS */
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:980px;font-family:var(--en);font-size:15px;font-weight:500;text-decoration:none;transition:all .25s;cursor:pointer;border:none}
.btn-primary{background:var(--text);color:var(--bg)}
.btn-primary:hover{opacity:.85;transform:scale(1.02)}
.btn-ghost{background:var(--surface);color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{background:var(--bg3);transform:scale(1.02)}

/* LAYOUT */
.container{max-width:1080px;margin:0 auto;padding:0 52px}
.section-eyebrow{font-size:11px;font-weight:600;letter-spacing:3px;text-transform:uppercase;color:var(--text3);margin-bottom:0}
.section-title{font-family:var(--serif);font-size:clamp(32px,5vw,52px);font-weight:400;letter-spacing:-1px;line-height:1.1;margin-bottom:20px}

/* FOOTER */
footer{padding:44px 52px;border-top:1px solid var(--border)}
.footer-inner{display:flex;justify-content:space-between;align-items:center}
.footer-brand{display:flex;align-items:center;gap:8px;color:var(--text)}
.footer-name{font-family:var(--serif);font-size:17px;font-weight:500;letter-spacing:4px;color:var(--text2)}
.footer-copy{font-size:13px;color:var(--text3)}
.footer-links{display:flex;gap:24px}
.footer-links a{font-size:13px;color:var(--text3);text-decoration:none;transition:color .2s}
.footer-links a:hover{color:var(--text2)}

/* PAGE HERO (inner pages) */
.page-hero{padding:140px 0 80px;border-bottom:1px solid var(--border)}
.page-eyebrow{font-size:11px;letter-spacing:3px;text-transform:uppercase;color:var(--text3);margin-bottom:20px}
.page-title{font-family:var(--serif);font-size:clamp(40px,7vw,80px);font-weight:400;letter-spacing:-2px;line-height:1.0}
.page-title em{font-style:italic;color:var(--text2)}
.page-sub{font-size:17px;color:var(--text2);font-weight:300;max-width:520px;line-height:1.7;margin-top:20px}

/* REVEAL ANIMATION */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .9s ease,transform .9s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-d1{transition-delay:.1s}
.reveal-d2{transition-delay:.2s}

@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

/* MOBILE */
@media(max-width:860px){
  nav{padding:0 20px}
  .nav-links{display:none}
  .container{padding:0 20px}
  footer{padding:32px 20px}
  .footer-inner{flex-direction:column;gap:16px;text-align:center}
  .footer-links{justify-content:center}
}