:root{
  --bg:#07040f;
  --ink:#f4f1ff;
  --muted:#b9b3cf;
  --cyan:#19e6ff;
  --magenta:#ff2fd2;
  --violet:#7a4dff;
  --font-latin:"Orbitron","Noto Sans TC",system-ui,sans-serif;
  --font-body:"Noto Sans TC","Inter",system-ui,sans-serif;
  --pad:clamp(20px,5vw,84px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}

/* ---------- loader ---------- */
.xp-loader{position:fixed;inset:0;z-index:50;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:22px;
  transition:opacity .9s ease,visibility .9s}
.xp-loader-mark{font-family:var(--font-latin);font-weight:900;font-size:2.4rem;letter-spacing:.14em;color:#fff;text-shadow:0 0 24px rgba(25,230,255,.6);
  animation:xp-pulse 1.6s ease-in-out infinite}
.xp-loader-bar{width:160px;height:1px;background:rgba(255,255,255,.12);overflow:hidden}
.xp-loader-bar span{display:block;height:100%;width:40%;background:linear-gradient(90deg,transparent,var(--cyan),transparent);animation:xp-bar 1.4s linear infinite}
@keyframes xp-bar{from{transform:translateX(-100%)}to{transform:translateX(260%)}}
@keyframes xp-pulse{0%,100%{opacity:.75}50%{opacity:1}}
.hero-ready .xp-loader{opacity:0;visibility:hidden}

/* ---------- header ---------- */
.xp-header{position:fixed;inset:0 0 auto 0;z-index:20;height:80px;display:flex;align-items:center;justify-content:space-between;padding:0 var(--pad);
  background:linear-gradient(180deg,rgba(7,4,15,.82) 0%,rgba(7,4,15,.35) 60%,rgba(7,4,15,0) 100%)}
.xp-header:after{content:"";position:absolute;left:var(--pad);right:var(--pad);bottom:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.14) 20%,rgba(255,255,255,.14) 80%,transparent)}
.xp-logo{display:flex;align-items:baseline;gap:10px}
.xp-logo-mark{font-family:var(--font-latin);font-weight:900;font-size:1.65rem;letter-spacing:.1em;color:#fff;text-shadow:0 0 18px rgba(25,230,255,.55)}
.xp-logo-tag{font-family:var(--font-latin);font-size:.56rem;letter-spacing:.34em;color:var(--cyan);opacity:.85;transform:translateY(-2px)}
.xp-nav{display:flex;gap:38px;font-size:.9rem;color:#d9d4ee;font-weight:500}
.xp-nav a{position:relative;padding:8px 0;transition:color .2s;display:inline-flex;align-items:baseline;gap:8px}
.xp-nav a i{font-style:normal;font-family:var(--font-latin);font-size:.55rem;letter-spacing:.1em;color:var(--cyan);opacity:.7}
.xp-nav a:after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:linear-gradient(90deg,var(--cyan),var(--magenta));transition:right .3s cubic-bezier(.2,.7,.2,1)}
.xp-nav a:hover{color:#fff}
.xp-nav a:hover:after{right:0}
.xp-side{display:flex;align-items:center;gap:22px;font-size:.84rem}
.xp-lang{font-family:var(--font-latin);letter-spacing:.14em;font-size:.72rem;color:#d9d4ee}
.xp-cta{position:relative;padding:11px 22px;color:#fff;letter-spacing:.08em;font-weight:700;font-size:.86rem;
  border:1px solid rgba(25,230,255,.5);overflow:hidden;transition:border-color .25s,color .25s}
.xp-cta:before{content:"";position:absolute;inset:0;background:var(--cyan);transform:translateX(-101%);transition:transform .32s cubic-bezier(.2,.7,.2,1)}
.xp-cta span{position:relative}
.xp-cta:hover{border-color:var(--cyan);color:#06111a}
.xp-cta:hover:before{transform:none}
/* corner brackets */
.xp-cta:after{content:"";position:absolute;width:6px;height:6px;right:-1px;top:-1px;border-top:2px solid var(--cyan);border-right:2px solid var(--cyan)}
.xp-burger{display:none;width:40px;height:40px;background:none;border:0;padding:8px;cursor:pointer;flex-direction:column;justify-content:center;gap:6px}
.xp-burger span{display:block;height:1.5px;background:#fff;transition:transform .3s}
.nav-open .xp-burger span:first-child{transform:translateY(3.75px) rotate(45deg)}
.nav-open .xp-burger span:last-child{transform:translateY(-3.75px) rotate(-45deg)}

/* ---------- hero ---------- */
.xp-hero{position:relative;height:100vh;min-height:680px;overflow:hidden;background:var(--bg)}
#city{position:absolute;inset:0;width:100%;height:100%;display:block}
.xp-hero:before{content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background:linear-gradient(90deg,rgba(7,4,15,.82) 0%,rgba(7,4,15,.5) 30%,rgba(7,4,15,0) 56%),
             linear-gradient(180deg,rgba(7,4,15,.35) 0%,rgba(7,4,15,0) 22%,rgba(7,4,15,0) 84%,var(--bg) 100%)}
.xp-hero-fallback{position:absolute;inset:0;display:none;
  background:radial-gradient(ellipse at 62% 58%,#ff8a3d 0,#ff2fd2 16%,#2a0846 44%,#07040f 76%)}
.no-webgl #city{display:none}
.no-webgl .xp-hero-fallback{display:block}

.xp-hero-copy{position:absolute;left:var(--pad);top:50%;transform:translateY(-52%);max-width:680px;z-index:3}
.xp-eyebrow{display:inline-flex;align-items:center;gap:14px;font-family:var(--font-latin);font-size:.66rem;letter-spacing:.34em;color:var(--cyan);margin-bottom:22px;
  text-shadow:0 0 12px rgba(25,230,255,.55)}
.xp-eyebrow i{width:34px;height:1px;background:var(--cyan);box-shadow:0 0 8px var(--cyan)}
.xp-eyebrow em{font-style:normal}
.xp-title{font-family:var(--font-latin);font-weight:900;font-size:clamp(5.2rem,12.5vw,11rem);line-height:.86;letter-spacing:-.015em;margin:0 0 22px;position:relative;
  background:linear-gradient(105deg,#fff 15%,#c9f6ff 40%,#ffd3f6 62%,#fff 90%);background-size:220% auto;-webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 0 26px rgba(25,230,255,.32)) drop-shadow(0 8px 30px rgba(0,0,0,.5));animation:xp-shine 9s linear infinite}
@keyframes xp-shine{to{background-position:220% center}}
.xp-sub{font-weight:900;font-size:clamp(1.4rem,2.9vw,2.35rem);line-height:1.28;margin:0 0 18px;letter-spacing:.01em;text-shadow:0 4px 30px rgba(0,0,0,.6)}
.xp-lead{color:var(--muted);font-size:clamp(.95rem,1.15vw,1.06rem);max-width:520px;margin:0 0 34px;text-shadow:0 2px 16px rgba(0,0,0,.7)}
.xp-actions{display:flex;gap:14px;flex-wrap:wrap}
.xp-btn{position:relative;display:inline-flex;align-items:center;gap:14px;padding:14px 28px;font-weight:700;letter-spacing:.08em;font-size:.94rem;overflow:hidden;
  transition:transform .25s cubic-bezier(.2,.7,.2,1),box-shadow .25s}
.xp-btn span,.xp-btn b{position:relative}
.xp-btn b{font-weight:400;transition:transform .25s}
.xp-btn-primary{background:var(--cyan);color:#06111a;box-shadow:0 0 28px rgba(25,230,255,.4),inset 0 0 0 1px rgba(255,255,255,.4)}
.xp-btn-primary:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.55),transparent);transform:translateX(-120%);transition:transform .6s}
.xp-btn-primary:hover{transform:translateY(-2px);box-shadow:0 0 44px rgba(25,230,255,.7),inset 0 0 0 1px rgba(255,255,255,.6)}
.xp-btn-primary:hover:before{transform:translateX(120%)}
.xp-btn-primary:hover b{transform:translateX(4px)}
.xp-btn-ghost{border:1px solid rgba(255,255,255,.38);color:#fff;backdrop-filter:blur(6px);background:rgba(7,4,15,.25)}
.xp-btn-ghost:hover{border-color:#fff;transform:translateY(-2px);background:rgba(255,255,255,.06)}

.xp-stats{position:absolute;left:var(--pad);bottom:40px;z-index:3;display:flex;gap:0;margin:0;padding:0;list-style:none}
.xp-stats li{display:flex;flex-direction:column;padding:0 34px 0 0;margin-right:34px;border-right:1px solid rgba(255,255,255,.14)}
.xp-stats li:last-child{border:0;margin:0;padding:0}
.xp-stats strong{font-family:var(--font-latin);font-weight:700;font-size:1.55rem;letter-spacing:.02em;color:#fff;line-height:1.1}
.xp-stats sup{font-size:.6em;color:var(--cyan);margin-left:2px}
.xp-stats span{font-size:.74rem;color:var(--muted);letter-spacing:.06em;margin-top:4px}

.xp-scroll{position:absolute;right:var(--pad);bottom:40px;z-index:3;writing-mode:vertical-rl;font-family:var(--font-latin);font-size:.6rem;letter-spacing:.36em;color:#bfb8dc;display:flex;align-items:center;gap:12px}
.xp-scroll span{width:1px;height:56px;background:linear-gradient(180deg,var(--cyan),transparent);animation:xp-drop 1.8s ease-in-out infinite}
@keyframes xp-drop{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* entrance: waits for the scene */
.xp-hero-copy>*,.xp-stats,.xp-scroll,.xp-header{opacity:0;transform:translateY(18px)}
.hero-ready .xp-hero-copy>*{animation:xp-up 1s cubic-bezier(.2,.7,.2,1) forwards}
/* copy lands as the camera settles (intro is 7 s) */
.hero-ready .xp-hero-copy>*:nth-child(1){animation-delay:4.2s}
.hero-ready .xp-hero-copy>*:nth-child(2){animation-delay:4.4s}
.hero-ready .xp-hero-copy>*:nth-child(3){animation-delay:4.65s}
.hero-ready .xp-hero-copy>*:nth-child(4){animation-delay:4.85s}
.hero-ready .xp-hero-copy>*:nth-child(5){animation-delay:5.05s}
.hero-ready .xp-header{animation:xp-up 1s .8s cubic-bezier(.2,.7,.2,1) forwards}
.hero-ready .xp-stats{animation:xp-up 1s 5.6s cubic-bezier(.2,.7,.2,1) forwards}
.hero-ready .xp-scroll{animation:xp-up 1s 5.8s cubic-bezier(.2,.7,.2,1) forwards}
@keyframes xp-up{to{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media (max-width:1050px){
  .xp-nav{position:fixed;inset:80px 0 0 0;flex-direction:column;gap:0;padding:20px var(--pad);background:rgba(7,4,15,.96);backdrop-filter:blur(12px);
    transform:translateY(-8px);opacity:0;pointer-events:none;transition:opacity .25s,transform .25s}
  .xp-nav a{font-size:1.4rem;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.08)}
  .nav-open .xp-nav{opacity:1;transform:none;pointer-events:auto}
  .xp-burger{display:flex}
  .xp-cta{display:none}
}
@media (max-width:700px){
  .xp-header{height:66px}
  .xp-nav{inset:66px 0 0 0}
  .xp-hero{min-height:620px}
  .xp-eyebrow em{display:none}
  .xp-hero:before{background:linear-gradient(180deg,rgba(7,4,15,.3) 0%,rgba(7,4,15,.1) 22%,rgba(7,4,15,.55) 40%,rgba(7,4,15,.6) 62%,rgba(7,4,15,.25) 78%,var(--bg) 100%)}
  .xp-eyebrow{font-size:.6rem;letter-spacing:.28em}
  .xp-hero-copy{left:20px;right:20px;transform:translateY(-56%)}
  .xp-title{font-size:5.2rem}
  .xp-lead{font-size:.92rem}
  .xp-stats{left:20px;right:20px;bottom:28px;justify-content:space-between}
  .xp-stats li{padding-right:14px;margin-right:14px}
  .xp-stats strong{font-size:1.2rem}
  .xp-stats span{font-size:.64rem}
  .xp-scroll{display:none}
}
@media (prefers-reduced-motion:reduce){
  .xp-hero-copy>*,.xp-stats,.xp-scroll,.xp-header{animation:none!important;opacity:1;transform:none}
  .xp-title{animation:none}
  .xp-loader{display:none}
}