:root{
  --bg:#0c0c0e;
  --bg-2:#101013;
  --ink:#ededed;
  --muted:#8b8b90;
  --line:#222226;
  --line-2:#2e2e34;
  --accent:#d8ff3e;      /* 克制的高亮色：酸柠檬绿 */
  --accent-ink:#0c0c0e;
  --maxw:1120px;
  --font:"Space Grotesk","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.01em;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.rule{border-top:1px solid var(--line);margin-top:48px}

/* ---------- NAV ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(12,12,14,.82);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand-mark{
  display:inline-grid;place-items:center;
  width:30px;height:30px;
  background:var(--accent);color:var(--accent-ink);
  font-family:var(--mono);font-weight:700;font-size:14px;
  border-radius:4px;
}
.brand-name{font-size:16px;letter-spacing:.02em}
.brand-name em{font-style:normal;color:var(--muted);font-weight:400;margin-left:2px}
.nav-links{display:flex;gap:28px}
.nav-links a{color:var(--muted);font-size:14px;transition:color .15s}
.nav-links a:hover{color:var(--ink)}
.nav-cta{margin-left:8px}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);transition:.2s}

/* ---------- BUTTONS ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--font);font-size:14px;font-weight:500;
  padding:11px 20px;border-radius:4px;cursor:pointer;
  border:1px solid transparent;transition:.15s ease;white-space:nowrap;
}
.btn-solid{background:var(--accent);color:var(--accent-ink);font-weight:700}
.btn-solid:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn-line{border-color:var(--line-2);color:var(--ink)}
.btn-line:hover{border-color:var(--ink)}
.btn-ghost{border:1px solid var(--line-2);color:var(--ink);padding:9px 16px}
.btn-ghost:hover{border-color:var(--ink)}
.btn-block{width:100%}

/* ---------- HERO ---------- */
.hero{padding:72px 0 0}
.hero-inner{display:grid;grid-template-columns:1.6fr .9fr;gap:48px;align-items:start}
.eyebrow{
  display:inline-block;font-family:var(--mono);font-size:12px;
  color:var(--accent);letter-spacing:.08em;text-transform:uppercase;
  border:1px solid var(--line-2);padding:4px 10px;border-radius:3px;margin-bottom:22px;
}
.hero h1{
  font-size:clamp(34px,5.4vw,60px);line-height:1.04;font-weight:700;
  letter-spacing:-.01em;margin-bottom:22px;
}
.lede{color:var(--muted);font-size:17px;max-width:46ch;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-note{margin-top:22px;font-size:13px;color:var(--muted);font-family:var(--mono)}
.hero-note a{color:var(--accent);border-bottom:1px solid transparent}
.hero-note a:hover{border-color:var(--accent)}

.hero-side{border:1px solid var(--line);border-radius:6px;overflow:hidden}
.side-row{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;border-bottom:1px solid var(--line);font-size:14px;
}
.side-row:last-child{border-bottom:0}
.side-row b{font-family:var(--mono);color:var(--accent);font-weight:500}
.side-row.dim{color:var(--muted)}
.side-row.dim b{color:var(--muted)}

/* ---------- STATS ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);
  border:1px solid var(--line);border-radius:6px;margin-top:56px;overflow:hidden;
}
.stat{padding:26px 22px;border-right:1px solid var(--line)}
.stat:last-child{border-right:0}
.stat .num{font-size:40px;font-weight:700;font-family:var(--mono);line-height:1}
.stat .unit{font-size:22px;color:var(--accent);font-family:var(--mono);margin-left:2px}
.stat p{color:var(--muted);font-size:13px;margin-top:10px}

/* ---------- SECTION ---------- */
.section{padding:84px 0}
.section-alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{margin-bottom:44px;max-width:62ch}
.sec-no{font-family:var(--mono);font-size:13px;color:var(--accent);letter-spacing:.1em}
.sec-head h2{font-size:clamp(26px,3.4vw,38px);font-weight:700;margin:10px 0 12px;letter-spacing:-.01em}
.sec-head p{color:var(--muted)}

/* ---------- CARDS ---------- */
.grid{display:grid;gap:16px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{
  border:1px solid var(--line);border-radius:6px;padding:24px;
  background:var(--bg);transition:border-color .15s,transform .15s;
}
.card:hover{border-color:var(--line-2);transform:translateY(-2px)}
.card h3{font-size:18px;font-weight:700;margin-bottom:10px}
.card p{color:var(--muted);font-size:14.5px}
.card-accent{border-color:var(--accent)}
.card-accent h3{color:var(--accent)}

/* ---------- TECH LIST ---------- */
.tech-list{list-style:none;border-top:1px solid var(--line)}
.tech-list li{
  display:flex;align-items:baseline;gap:24px;
  padding:18px 4px;border-bottom:1px solid var(--line);
}
.tech-list li span{font-size:18px;font-weight:700;min-width:140px}
.tech-list li em{font-style:normal;color:var(--muted);font-family:var(--mono);font-size:13.5px}

/* ---------- CASE ---------- */
.case{
  display:grid;grid-template-columns:1.1fr .9fr;gap:32px;
  border:1px solid var(--line);border-radius:8px;overflow:hidden;
  background:var(--bg);
}
.case + .case{margin-top:20px}
.case-text{padding:34px}
.case-tag{
  font-family:var(--mono);font-size:12px;color:var(--accent);
  border:1px solid var(--line-2);padding:3px 9px;border-radius:3px;
}
.case-text h3{font-size:22px;font-weight:700;margin:16px 0 14px;line-height:1.25}
.case-text p{color:var(--muted);font-size:15px;margin-bottom:18px}
.case-points{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px 18px;margin-bottom:24px}
.case-points li{position:relative;padding-left:16px;font-size:14px;color:var(--ink)}
.case-points li::before{content:"▸";position:absolute;left:0;color:var(--accent)}

.case-shot{border-left:1px solid var(--line);background:var(--bg-2);padding:22px;display:flex;flex-direction:column}
.shot-bar{display:flex;align-items:center;gap:6px;padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:16px}
.shot-bar i{width:9px;height:9px;border-radius:50%;background:var(--line-2)}
.shot-bar span{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--muted)}
.shot-body{display:flex;flex-direction:column;gap:12px}
.shot-line{height:10px;background:var(--line-2);border-radius:2px}
.shot-line.w40{width:40%}.shot-line.w55{width:55%}.shot-line.w70{width:70%}.shot-line.w90{width:90%}
.shot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:4px 0}
.shot-grid span{height:42px;background:var(--line);border-radius:3px}
.shot-grid span:nth-child(2){background:var(--accent);opacity:.85}
.shot-grid span:nth-child(5){background:var(--accent);opacity:.5}
.shot-row{display:flex;gap:10px}
.shot-row b{font-family:var(--mono);font-size:12px;padding:6px 10px;border:1px solid var(--line-2);border-radius:3px}
.shot-row .up{color:var(--accent)}
.shot-row .dn{color:var(--muted)}

/* ---------- STEPS ---------- */
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:s}
.steps li{border:1px solid var(--line);border-radius:6px;padding:22px;background:var(--bg)}
.step-no{font-family:var(--mono);font-size:13px;color:var(--accent)}
.steps h3{font-size:17px;font-weight:700;margin:10px 0 8px}
.steps p{color:var(--muted);font-size:14px}

/* ---------- CONTACT ---------- */
.contact-inner{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact-lead h2{font-size:clamp(28px,3.6vw,40px);font-weight:700;margin:12px 0 14px;letter-spacing:-.01em}
.contact-lead p{color:var(--muted);max-width:42ch;margin-bottom:24px}
.contact-ch{list-style:none;display:flex;flex-direction:column;gap:10px}
.contact-ch li{display:flex;gap:14px;align-items:baseline;border-top:1px solid var(--line);padding-top:10px}
.contact-ch span{font-family:var(--mono);font-size:12px;color:var(--muted);min-width:84px;text-transform:uppercase;letter-spacing:.06em}
.contact-ch em{font-style:normal;font-family:var(--mono);font-size:15px;color:var(--accent)}

.contact-form{display:flex;flex-direction:column;gap:14px;border:1px solid var(--line);border-radius:8px;padding:26px;background:var(--bg)}
.contact-form label{display:flex;flex-direction:column;gap:7px;font-size:13px;color:var(--muted)}
.contact-form input,.contact-form textarea{
  background:var(--bg-2);border:1px solid var(--line-2);border-radius:4px;
  color:var(--ink);font-family:var(--font);font-size:15px;padding:11px 12px;resize:vertical;
}
.contact-form input:focus,.contact-form textarea:focus{outline:0;border-color:var(--accent)}
.form-tip{font-size:13px;color:var(--accent);font-family:var(--mono)}

/* ---------- FOOTER ---------- */
.foot{border-top:1px solid var(--line);padding:32px 0}
.foot-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}
.foot-brand{display:flex;align-items:center;gap:10px;font-weight:700}
.foot-links{display:flex;gap:22px}
.foot-links a{color:var(--muted);font-size:14px}
.foot-links a:hover{color:var(--ink)}
.foot-copy{color:var(--muted);font-size:13px;font-family:var(--mono);width:100%;border-top:1px solid var(--line);padding-top:18px;margin-top:6px}

/* ---------- TOAST ---------- */
.toast{
  position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(20px);
  background:var(--accent);color:var(--accent-ink);font-weight:600;font-size:14px;
  padding:12px 20px;border-radius:5px;opacity:0;pointer-events:none;transition:.25s;z-index:80;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- REVEAL ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- RESPONSIVE ---------- */
@media(max-width:900px){
  .hero-inner{grid-template-columns:1fr;gap:32px}
  .hero-side{max-width:420px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stat:nth-child(2){border-right:0}
  .stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--line)}
  .grid-3{grid-template-columns:1fr 1fr}
  .case{grid-template-columns:1fr}
  .case-shot{border-left:0;border-top:1px solid var(--line)}
  .steps{grid-template-columns:1fr 1fr}
  .contact-inner{grid-template-columns:1fr;gap:32px}
  .tech-list li{flex-direction:column;gap:6px}
  .tech-list li span{min-width:0}
}
@media(max-width:640px){
  .nav-links,.nav-cta{display:none}
  .nav-links.open{
    display:flex;flex-direction:column;gap:0;position:absolute;top:64px;left:0;right:0;
    background:var(--bg);border-bottom:1px solid var(--line);padding:8px 24px 16px;
  }
  .nav-links.open a{padding:12px 0;border-bottom:1px solid var(--line)}
  .nav-toggle{display:flex}
  .grid-3,.steps{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr}
  .stat{border-right:0;border-bottom:1px solid var(--line)}
  .stat:last-child{border-bottom:0}
  .case-points{grid-template-columns:1fr}
  .section{padding:64px 0}
}