:root{
  --bg:#0a0a0b;
  --bg-alt:#0f0f11;
  --fg:#f2f3f5;
  --dim:#9a9ca3;
  --dim-2:#6b6d75;
  --line:rgba(255,255,255,.09);
  --line-strong:rgba(255,255,255,.18);
  --glass:rgba(255,255,255,.055);
  --accent:#e8eaed;
  --radius:18px;
  --wrap:1080px;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background:var(--bg);
  color:var(--fg);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

a{color:var(--fg);text-decoration:none}
a:hover{color:#fff}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.narrow{max-width:760px}

/* ---- nav ---- */
nav{
  position:sticky;top:0;z-index:50;
  background:rgba(10,10,11,.72);
  backdrop-filter:blur(18px) saturate(1.4);
  -webkit-backdrop-filter:blur(18px) saturate(1.4);
  border-bottom:1px solid var(--line);
}
nav .wrap{display:flex;align-items:center;gap:28px;height:60px}
nav .brand{
  display:flex;align-items:center;gap:9px;
  font-weight:650;letter-spacing:.01em;font-size:16px;
}
nav .links{display:flex;gap:22px;margin-left:auto;font-size:14px;color:var(--dim)}
nav .links a{color:var(--dim)}
nav .links a:hover{color:var(--fg)}
nav .cta{
  font-size:13.5px;padding:7px 16px;border-radius:999px;
  background:var(--fg);color:#0a0a0b;font-weight:600;
}
nav .cta:hover{background:#fff}

/* ---- hero ---- */
header{padding:84px 0 60px;text-align:center}
.eyebrow{
  display:inline-block;margin:0 0 18px;
  font-size:12.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--dim-2);
}
header h1{
  margin:0 0 20px;
  font-size:clamp(44px,8vw,84px);
  font-weight:700;letter-spacing:-.03em;line-height:1;
}
.lede{margin:0 auto;max-width:600px;font-size:17px;color:var(--dim);line-height:1.75}
.lede strong{color:var(--fg);font-weight:600}

.actions{display:flex;gap:12px;justify-content:center;margin:34px 0 0;flex-wrap:wrap}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 26px;border-radius:999px;font-size:14.5px;font-weight:600;
  border:1px solid transparent;transition:transform .18s ease,background .18s ease,border-color .18s ease;
}
.btn:active{transform:scale(.985)}
.btn.primary{background:var(--fg);color:#0a0a0b}
.btn.primary:hover{background:#fff}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--line-strong)}
.btn.ghost:hover{background:var(--glass);border-color:rgba(255,255,255,.32)}

.hero-shot{margin:64px 0 0;position:relative}
.hero-shot img{
  width:100%;height:auto;display:block;border-radius:var(--radius);
  border:1px solid var(--line);
  box-shadow:0 40px 80px -30px rgba(0,0,0,.9),0 0 0 1px rgba(255,255,255,.03);
}
.hero-shot figcaption{margin-top:14px;font-size:13px;color:var(--dim-2)}

/* ---- sections ---- */
section{padding:88px 0}
section.alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.head{max-width:640px;margin:0 0 44px}
.head h2{
  margin:0 0 14px;font-size:clamp(28px,4vw,40px);
  font-weight:650;letter-spacing:-.02em;line-height:1.2;
}
.head p{margin:0;color:var(--dim);font-size:15.5px}

/* ---- feature cards ---- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{
  padding:24px 22px;border-radius:var(--radius);
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  transition:border-color .2s ease,background .2s ease;
}
.card:hover{border-color:var(--line-strong);background:rgba(255,255,255,.08)}
.card h3{margin:0 0 8px;font-size:16px;font-weight:620;letter-spacing:-.01em}
.card p{margin:0;font-size:13.8px;color:var(--dim);line-height:1.72}

/* ---- shots ---- */
.shots{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.shots figure{margin:0}
.shots img{
  width:100%;height:auto;display:block;border-radius:14px;
  border:1px solid var(--line);
  transition:border-color .2s ease;
}
.shots figure:hover img{border-color:var(--line-strong)}
.shots figcaption{margin-top:10px;font-size:12.5px;color:var(--dim-2)}

/* ---- steps ---- */
.steps{list-style:none;counter-reset:s;padding:0;margin:0}
.steps li{counter-increment:s;position:relative;padding:0 0 34px 54px}
.steps li::before{
  content:counter(s);
  position:absolute;left:0;top:0;
  width:32px;height:32px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:650;
  background:var(--glass);border:1px solid var(--line-strong);color:var(--dim);
}
.steps li::after{
  content:"";position:absolute;left:15.5px;top:40px;bottom:8px;
  width:1px;background:var(--line);
}
.steps li:last-child::after{display:none}
.steps h3{margin:4px 0 8px;font-size:16.5px;font-weight:620}
.steps p{margin:0;color:var(--dim);font-size:14.5px}
.dl{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0 10px}
.dl .btn{padding:10px 20px;font-size:13.5px}
.hint{font-size:13px;color:var(--dim-2)}
.hint a{color:var(--dim);text-decoration:underline;text-underline-offset:3px}

.note{
  margin-top:8px;padding:18px 20px;border-radius:14px;
  background:var(--glass);border:1px solid var(--line);
  font-size:13.8px;color:var(--dim);line-height:1.75;
}
.note strong{color:var(--fg)}
.note code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:12.5px;padding:2px 6px;border-radius:5px;
  background:rgba(255,255,255,.07);color:#e8eaed;
}

/* ---- faq ---- */
details{
  border-bottom:1px solid var(--line);
  padding:18px 0;
}
details summary{
  cursor:pointer;font-size:15.5px;font-weight:600;
  list-style:none;display:flex;align-items:center;justify-content:space-between;
  gap:16px;
}
details summary::-webkit-details-marker{display:none}
details summary::after{
  content:"+";color:var(--dim-2);font-size:20px;font-weight:400;
  transition:transform .2s ease;
}
details[open] summary::after{transform:rotate(45deg)}
details p{margin:12px 0 0;color:var(--dim);font-size:14.2px}

/* ---- footer ---- */
footer{padding:56px 0 64px;border-top:1px solid var(--line)}
footer .wrap{display:flex;justify-content:space-between;gap:28px;flex-wrap:wrap}
footer .brand{display:flex;align-items:center;gap:8px;font-weight:620;font-size:15px}
footer p{margin:12px 0 0;font-size:13px;color:var(--dim-2);max-width:420px}
footer p a{color:var(--dim);text-decoration:underline;text-underline-offset:3px}
.fright{display:flex;gap:22px;font-size:13.5px;color:var(--dim-2);align-items:flex-start}
.fright a{color:var(--dim-2)}
.fright a:hover{color:var(--fg)}

/* ---- responsive ---- */
@media (max-width:860px){
  .grid{grid-template-columns:1fr 1fr}
  .shots{grid-template-columns:1fr}
  nav .links{display:none}
  header{padding:60px 0 40px}
  section{padding:66px 0}
  .hero-shot{margin-top:44px}
}
@media (max-width:560px){
  .grid{grid-template-columns:1fr}
  .wrap{padding:0 18px}
  .lede{font-size:15.5px}
  .steps li{padding-left:46px}
}

@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
  html{scroll-behavior:auto}
}

/* ---- 竖屏手机：桌面截图是 16:9，画质优先不加遮罩 ---- */
@media (max-width:560px){
  .card{padding:20px 18px}
  .note{padding:15px 16px}
}

/* 打印/极简：去掉玻璃与深色 */
@media print{
  body{background:#fff;color:#000}
  nav,footer{display:none}
}