/* ============================================================
   Vortexai LLC — company website
   Single stylesheet shared by index.html (EN) and zh.html (中文)
   ============================================================ */

:root{
  --ink:#080d18;
  --line:rgba(255,255,255,.09);
  --text:#e9eef7;
  --muted:#9aa8bf;
  --accent:#5ce1c4;
  --accent-2:#7c8cff;
  --radius:18px;
  --max:1080px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(900px 520px at 84% -12%, rgba(124,140,255,.20), transparent 62%),
    radial-gradient(760px 480px at 4% 4%, rgba(92,225,196,.13), transparent 60%),
    var(--ink);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC","Hiragino Sans TC","Microsoft JhengHei","Segoe UI",system-ui,sans-serif;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{line-height:1.26;margin:0;font-weight:700;letter-spacing:-.015em}
p{margin:0}
a{color:inherit;text-decoration:none}
ul{margin:0;padding:0;list-style:none}

.wrap{width:min(100% - 44px,var(--max));margin-inline:auto}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent);font-weight:600;
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.7}
.tick{color:var(--accent)}
.note{font-size:13.5px;color:var(--muted);margin-top:18px}

/* ---------- header ---------- */
header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(14px);
  background:rgba(8,13,24,.74);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:24px;height:70px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.02em}
.mark{
  width:28px;height:28px;border-radius:9px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));
  box-shadow:0 6px 18px rgba(124,140,255,.35);
}
.nav nav{display:flex;align-items:center;gap:24px;font-size:14.5px;color:var(--muted)}
.nav nav a:hover{color:var(--text)}
.nav .btn{padding:9px 18px;font-size:14px}
.lang{border:1px solid var(--line);border-radius:999px;padding:4px 12px;font-size:13px}
@media (max-width:1000px){.nav nav{display:none}}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;border-radius:999px;font-weight:600;font-size:15px;
  border:1px solid transparent;cursor:pointer;transition:.2s;
}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),#4fc8ff);
  color:#04121a;
  box-shadow:0 10px 30px rgba(92,225,196,.22);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 14px 36px rgba(92,225,196,.3)}
.btn-ghost{border-color:var(--line);color:var(--text);background:rgba(255,255,255,.03)}
.btn-ghost:hover{background:rgba(255,255,255,.07)}

/* ---------- hero ---------- */
.hero{padding:92px 0 76px}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(32px,4.4vw,52px);margin:22px 0 20px}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(110deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero p.lead{font-size:17.5px;color:var(--muted);max-width:54ch}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:32px}
@media (max-width:900px){
  .hero{padding:64px 0 56px}
  .hero-grid{grid-template-columns:1fr;gap:40px}
}

.panel{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px;
}
.panel h3{font-size:13px;color:var(--muted);font-weight:600;letter-spacing:.1em;text-transform:uppercase}
.steps{margin-top:16px;display:grid;gap:10px}
.steps li{
  display:flex;align-items:center;gap:12px;
  background:rgba(255,255,255,.035);
  border:1px solid var(--line);
  border-radius:12px;padding:12px 14px;font-size:14.5px;
}
.dot{
  width:22px;height:22px;border-radius:50%;flex:none;display:grid;place-items:center;
  font-size:11px;font-weight:700;background:rgba(92,225,196,.16);color:var(--accent);
}
.steps li.done .dot{background:rgba(92,225,196,.9);color:#04121a}
.steps li.active{border-color:rgba(124,140,255,.5);background:rgba(124,140,255,.10)}

/* ---------- strip ---------- */
.strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:rgba(255,255,255,.02)}
.strip ul{
  display:flex;flex-wrap:wrap;gap:12px 32px;justify-content:space-between;
  padding:20px 0;font-size:14.5px;color:var(--muted);
}
.strip li{display:flex;align-items:center;gap:9px}

/* ---------- sections ---------- */
section{padding:84px 0}
section.tight{padding:64px 0}
.head{max-width:64ch;margin-bottom:44px}
.head h2{font-size:clamp(26px,3.1vw,36px);margin:16px 0 14px}
.head p{color:var(--muted);font-size:16.5px}
.head p + p{margin-top:12px}

.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(2,1fr)}
@media (max-width:900px){.g3,.g4{grid-template-columns:1fr}.g2{grid-template-columns:1fr}}

.card{
  background:linear-gradient(180deg,rgba(255,255,255,.055),rgba(255,255,255,.018));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;transition:.22s;
}
.card:hover{transform:translateY(-3px);border-color:rgba(255,255,255,.2)}
.card h3{font-size:18.5px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.num{font-size:12.5px;font-weight:700;color:var(--accent);letter-spacing:.12em;display:block;margin-bottom:14px}
.card ul.plain{margin-top:14px;color:var(--muted);font-size:14.5px}
.card ul.plain li{display:flex;gap:10px;margin:6px 0}

/* ---------- about ---------- */
.about{
  border:1px solid var(--line);border-radius:22px;padding:38px;
  background:
    radial-gradient(620px 260px at 88% -20%, rgba(124,140,255,.16), transparent 70%),
    linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
}
.about blockquote{
  margin:0;font-size:clamp(18px,2.2vw,22px);line-height:1.7;font-weight:500;
}
.about blockquote strong{
  font-weight:700;
  background:linear-gradient(110deg,var(--accent),var(--accent-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.about p{margin-top:22px;color:var(--muted);font-size:15.5px;max-width:78ch}

/* ---------- pain ---------- */
.pain{display:grid;gap:16px}
.pain li{
  border-left:2px solid rgba(124,140,255,.55);
  padding:2px 0 2px 18px;color:var(--muted);font-size:15.5px;
}
.pain strong{display:block;color:var(--text);font-weight:600;margin-bottom:4px}

/* ---------- chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  border:1px solid var(--line);border-radius:999px;padding:8px 16px;
  font-size:14px;color:var(--muted);background:rgba(255,255,255,.03);
}

/* ---------- engagements ---------- */
.engage{
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,rgba(255,255,255,.055),rgba(255,255,255,.018));
  border:1px solid var(--line);border-radius:var(--radius);padding:28px;
}
.engage.featured{
  border-color:rgba(92,225,196,.45);
  background:
    radial-gradient(520px 240px at 50% -20%, rgba(92,225,196,.16), transparent 70%),
    linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
}
.tag{
  align-self:flex-start;font-size:11.5px;font-weight:700;letter-spacing:.1em;
  padding:5px 11px;border-radius:999px;margin-bottom:16px;text-transform:uppercase;
  background:rgba(92,225,196,.16);color:var(--accent);
}
.engage h3{font-size:19px}
.engage > p{color:var(--muted);font-size:14.5px;margin-top:12px;min-height:66px}
.engage ul{margin-top:20px;font-size:14.5px;color:var(--muted);display:grid;gap:9px}
.engage ul li{display:flex;gap:10px}
.engage .scope{
  margin-top:22px;padding-top:16px;border-top:1px solid var(--line);
  font-size:13.5px;color:var(--muted);
}

/* ---------- faq ---------- */
details{border-bottom:1px solid var(--line);padding:20px 0}
details summary{
  cursor:pointer;font-weight:600;font-size:16.5px;list-style:none;
  display:flex;justify-content:space-between;gap:20px;align-items:center;
}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--accent);font-size:20px;font-weight:400}
details[open] summary::after{content:"–"}
details p{color:var(--muted);font-size:15.5px;margin-top:12px;max-width:82ch}
details p + p{margin-top:10px}

/* ---------- contact ---------- */
.contact{
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  border:1px solid var(--line);border-radius:24px;padding:44px;
  display:grid;grid-template-columns:1fr 1fr;gap:44px;
}
@media (max-width:900px){.contact{grid-template-columns:1fr;padding:30px}}
.contact h2{font-size:clamp(24px,3vw,32px);margin:16px 0 14px}
.contact p{color:var(--muted);font-size:16px}
.rows{margin-top:28px;display:grid;gap:14px;font-size:15.5px}
.rows div{display:flex;gap:10px;color:var(--muted);flex-wrap:wrap}
.rows b{color:var(--text);font-weight:600;min-width:104px}
form{display:grid;gap:14px}
label{font-size:13.5px;color:var(--muted);display:block;margin-bottom:6px}
input,textarea,select{
  width:100%;padding:12px 14px;border-radius:12px;
  background:rgba(0,0,0,.28);border:1px solid var(--line);color:var(--text);
  font:inherit;font-size:15px;
}
input:focus,textarea:focus,select:focus{outline:none;border-color:rgba(92,225,196,.6)}
textarea{min-height:104px;resize:vertical}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:34px 0;color:var(--muted);font-size:14px}
.foot{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
.foot a:hover{color:var(--text)}