:root{
  --bg:#ffffff;
  --ink:#080808;
  --gray-800:#222;
  --gray-700:#363636;
  --gray-500:#5a5a5a;
  --gray-300:#ababab;
  --border:#d8d8d8;
  --border-hover:#898989;
  --surface-soft:#f7f7f7;

  --blue:#146ef5;
  --blue-hover:#0055d4;
  --blue-tint:rgba(20,110,245,0.10);

  --r-md:4px;
  --r-lg:8px;

  --shadow-soft:
    rgba(0,0,0,0) 0px 84px 24px,
    rgba(0,0,0,0.01) 0px 54px 22px,
    rgba(0,0,0,0.04) 0px 30px 18px,
    rgba(0,0,0,0.08) 0px 13px 13px,
    rgba(0,0,0,0.09) 0px 3px 7px;

  --container:1180px;
  --gutter:32px;

  --font-sans: "Noto Sans SC", "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Inconsolata", ui-monospace, Menlo, monospace;
}
*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; }
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-sans);
  font-weight:500;
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{ color:inherit; text-decoration:none; cursor:pointer; }
button{ font-family:inherit; cursor:pointer; }
img{ display:block; max-width:100%; }

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--gutter);
}

h1,h2,h3,h4{ margin:0; font-weight:600; line-height:1.15; letter-spacing:-0.01em; text-wrap:balance; }
h1{ font-size:64px; line-height:1.08; letter-spacing:-0.02em; }
h2{ font-size:44px; }
h3{ font-size:24px; font-weight:600; }
p{ margin:0; }

.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-size:12.8px; font-weight:600; letter-spacing:0.12em;
  color:var(--blue);
  text-transform:uppercase;
  font-family:"Inter", var(--font-sans);
}
.eyebrow .dot{
  width:6px; height:6px; border-radius:50%;
  background:var(--blue);
  box-shadow:0 0 0 4px var(--blue-tint);
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-size:16px; font-weight:500;
  padding:14px 22px;
  border-radius:var(--r-md);
  border:1px solid transparent;
  transition:transform .25s ease, background .2s ease, color .2s ease, border-color .2s ease;
  white-space:nowrap;
}
.btn .arrow{ transition:transform .25s ease; display:inline-flex; }
.btn:hover .arrow{ transform:translateX(6px); }
.btn-primary{ background:var(--blue); color:#fff; }
.btn-primary:hover{ background:var(--blue-hover); }
.btn-outline{ border-color:var(--border); background:#fff; color:var(--ink); }
.btn-outline:hover{ border-color:var(--ink); }
.btn-sm{ padding:9px 14px; font-size:14px; }

/* ---------- NAV ---------- */
.nav{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,0.86);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--border);
}
.nav__inner{
  display:flex; align-items:center;
  height:64px;
}
.nav__logo{
  display:inline-flex; align-items:center; gap:10px;
  font-weight:700; font-size:18px; letter-spacing:-0.02em;
  font-family:"Inter", var(--font-sans);
}
.nav__menu{
  display:flex; align-items:center; gap:4px;
  margin-left:32px;
}
.nav__item{
  padding:8px 12px;
  font-size:14px; font-weight:500;
  color:var(--gray-700);
  border-radius:var(--r-md);
  transition:color .2s, background .2s;
}
.nav__item:hover{ color:var(--ink); background:rgba(0,0,0,0.04); }
.nav__cta{ margin-left:auto; display:flex; align-items:center; gap:10px; }
.lang-toggle{
  padding:6px 11px;
  font-size:13px; font-weight:500; font-family:inherit;
  color:var(--gray-700);
  background:transparent;
  border:1px solid var(--border);
  border-radius:var(--r-md);
  cursor:pointer;
  transition:color .2s, border-color .2s, background .2s;
}
.lang-toggle:hover{ color:var(--ink); border-color:var(--ink); background:rgba(0,0,0,0.04); }

/* ---------- HERO ---------- */
.hero{
  position:relative;
  padding:104px 0 96px;
  overflow:hidden;
}
.hero__inner{
  max-width:880px;
  margin:0 auto;
  text-align:center;
}
.hero h1{
  margin:20px 0 24px;
}
.hero h1 em{
  font-style:normal;
  color:var(--blue);
}
.hero__lede{
  font-size:20px;
  line-height:1.6;
  color:var(--gray-700);
  font-weight:450;
  max-width:62ch;
  margin:0 auto;
}
.hero__cta-row{
  display:flex; gap:12px; flex-wrap:wrap;
  justify-content:center;
  margin-top:40px;
}
.hero__meta{
  display:flex; gap:48px; flex-wrap:wrap;
  justify-content:center;
  margin-top:64px;
  padding-top:32px;
  border-top:1px solid var(--border);
  color:var(--gray-500);
  font-size:14px;
}
.hero__meta strong{ color:var(--ink); font-weight:600; }

/* faint grid bg */
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    radial-gradient(circle at 50% 0%, var(--blue-tint), transparent 50%),
    linear-gradient(to right, rgba(0,0,0,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0,0,0,0.04) 1px, transparent 1px);
  background-size: auto, 64px 64px, 64px 64px;
  mask-image:linear-gradient(to bottom, #000 0%, #000 60%, transparent 100%);
  -webkit-mask-image:linear-gradient(to bottom, #000 0%, #000 60%, transparent 100%);
  pointer-events:none;
}
.hero > .container{ position:relative; z-index:1; }

/* ---------- SECTION ---------- */
.section{ padding:112px 0; }
.section--soft{ background:var(--surface-soft); }
.section__head{
  text-align:center;
  max-width:700px;
  margin:0 auto 64px;
}
.section__head h2{ margin:16px 0 16px; }
.section__head p{ color:var(--gray-700); font-size:18px; line-height:1.6; }

/* ---------- FEATURES ---------- */
.feat-grid{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:20px;
}
.feat-card{
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:28px;
  transition:border-color .2s, transform .2s;
}
.feat-card:hover{ border-color:var(--border-hover); }
.feat-card .icon{
  width:40px; height:40px;
  border-radius:var(--r-md);
  background:var(--blue-tint);
  color:var(--blue);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:24px;
}
.feat-card h3{ font-size:18px; margin-bottom:8px; letter-spacing:0; }
.feat-card p{ color:var(--gray-700); font-size:14.5px; line-height:1.65; }

/* ---------- PRICING ---------- */
.pricing{
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:20px;
}
.plan{
  position:relative;
  display:flex; flex-direction:column;
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--r-lg);
  padding:32px 28px;
  transition:border-color .2s, transform .2s;
}
.plan:hover{ border-color:var(--border-hover); transform:translateY(-2px); }
.plan--featured{
  border-color:var(--ink);
  background:var(--ink);
  color:#fff;
  box-shadow:var(--shadow-soft);
}
.plan--featured:hover{ border-color:var(--ink); }
.plan__name{
  font-size:13px; font-weight:600;
  letter-spacing:0.08em; text-transform:uppercase;
  color:var(--gray-500);
  font-family:"Inter", var(--font-sans);
}
.plan--featured .plan__name{ color:#7ab2ff; }
.plan__cn{
  font-size:22px; font-weight:600;
  margin-top:6px;
}
.plan__price{
  margin-top:20px;
  display:flex; align-items:baseline; gap:6px;
  font-weight:600;
  letter-spacing:-0.02em;
}
.plan__price .num{ font-size:48px; line-height:1; }
.plan__price .cur{ font-size:18px; color:var(--gray-500); font-weight:500; }
.plan--featured .plan__price .cur{ color:rgba(255,255,255,0.6); }
.plan__per{
  margin-top:8px;
  font-size:13.5px;
  color:var(--gray-500);
}
.plan--featured .plan__per{ color:rgba(255,255,255,0.6); }
.plan__save{
  display:inline-block;
  margin-top:14px;
  padding:3px 8px;
  border-radius:var(--r-md);
  background:var(--blue-tint);
  color:var(--blue);
  font-size:12px; font-weight:600;
  font-family:"Inter", var(--font-sans);
  letter-spacing:0.02em;
}
.plan--featured .plan__save{
  background:rgba(122,178,255,0.18);
  color:#7ab2ff;
}
.plan__cta{
  margin-top:28px;
  width:100%;
  justify-content:center;
}
.plan--featured .plan__cta.btn-outline{
  background:#fff;
  color:var(--ink);
  border-color:#fff;
}
.plan__ribbon{
  position:absolute;
  top:-10px; left:50%;
  transform:translateX(-50%);
  background:var(--blue);
  color:#fff;
  padding:4px 10px;
  font-size:11px; font-weight:600;
  letter-spacing:0.08em; text-transform:uppercase;
  border-radius:var(--r-md);
  font-family:"Inter", var(--font-sans);
}

/* ---------- DOWNLOAD ---------- */
.download{
  background:var(--ink);
  color:#fff;
  border-radius:var(--r-lg);
  padding:64px;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px;
  align-items:center;
  position:relative;
  overflow:hidden;
}
.download::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(circle at 15% 30%, var(--blue-tint), transparent 45%),
    radial-gradient(circle at 90% 80%, rgba(122,61,255,0.18), transparent 50%);
}
.download__copy{ position:relative; z-index:1; }
.download__copy h2{ font-size:40px; margin:14px 0 16px; }
.download__copy p{ color:rgba(255,255,255,0.7); font-size:17px; line-height:1.6; max-width:42ch; }
.download__grid{
  position:relative; z-index:1;
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:12px;
}
.dl-card{
  display:flex; align-items:center; gap:14px;
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.10);
  border-radius:var(--r-md);
  padding:16px 18px;
  transition:background .2s, border-color .2s, transform .2s;
}
.dl-card:hover{
  background:rgba(255,255,255,0.10);
  border-color:rgba(255,255,255,0.22);
}
.dl-card__icon{
  width:36px; height:36px;
  display:flex; align-items:center; justify-content:center;
  color:#fff;
  flex-shrink:0;
}
.dl-card__t{ font-size:11px; line-height:1.3; color:rgba(255,255,255,0.55); letter-spacing:0.04em; font-family:"Inter", var(--font-sans); white-space:nowrap; }
.dl-card__b{ font-size:15px; line-height:1.3; font-weight:600; margin-top:3px; white-space:nowrap; }

/* ---------- FOOTER ---------- */
.footer{
  border-top:1px solid var(--border);
  padding:40px 0;
  font-size:13.5px;
  color:var(--gray-500);
}
.footer__inner{
  display:flex; align-items:center; justify-content:space-between;
  flex-wrap:wrap; gap:16px;
}
.footer__brand{
  display:inline-flex; align-items:center; gap:10px;
  font-weight:600; color:var(--ink);
  font-family:"Inter", var(--font-sans);
}
.footer__links{ display:flex; gap:24px; }
.footer__links a:hover{ color:var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 992px){
  :root{ --gutter:24px; --container:100%; }
  h1{ font-size:44px; }
  h2{ font-size:32px; }
  .hero{ padding:72px 0 64px; }
  .section{ padding:80px 0; }
  .feat-grid{ grid-template-columns:1fr 1fr; }
  .pricing{ grid-template-columns:1fr 1fr; }
  .download{ grid-template-columns:1fr; padding:48px 32px; gap:36px; }
  .download__copy h2{ font-size:32px; }
  .nav__menu{ display:none; }
}
@media (max-width: 640px){
  :root{ --gutter:20px; }
  h1{ font-size:34px; line-height:1.2; }
  h2{ font-size:26px; }
  h3{ font-size:18px; }

  body{ font-size:15px; }

  /* nav */
  .nav__inner{ height:56px; }
  .nav__logo{ font-size:16px; }
  .nav__cta{ gap:8px; }
  .nav__cta .btn-outline{ display:none; }
  .btn{ padding:11px 16px; font-size:14.5px; }
  .btn-sm{ padding:8px 12px; font-size:13px; }

  /* hero */
  .hero{ padding:48px 0 56px; }
  .hero h1{ margin:14px 0 18px; }
  .hero__lede{ font-size:15.5px; line-height:1.6; }
  .hero__cta-row{ margin-top:28px; flex-direction:column; align-items:stretch; gap:10px; }
  .hero__cta-row .btn{ width:100%; justify-content:center; }
  .hero__meta{
    margin-top:40px; padding-top:24px;
    gap:14px 24px;
    font-size:13px;
    justify-content:flex-start;
    text-align:left;
  }
  .hero__meta > div{ flex:1 1 calc(50% - 12px); }

  /* sections */
  .section{ padding:64px 0; }
  .section__head{ margin-bottom:40px; }
  .section__head p{ font-size:15.5px; }

  /* features */
  .feat-grid{ grid-template-columns:1fr; gap:14px; }
  .feat-card{ padding:24px; }
  .feat-card .icon{ width:36px; height:36px; margin-bottom:18px; }

  /* pricing */
  .pricing{ grid-template-columns:1fr; gap:14px; }
  .plan{ padding:28px 24px; }
  .plan__price .num{ font-size:40px; }
  .plan--featured{ order:-1; }  /* 把"最受欢迎"提到最上 */

  /* download */
  .download{ padding:40px 24px; gap:28px; border-radius:var(--r-md); }
  .download__copy h2{ font-size:26px; }
  .download__copy p{ font-size:15px; }
  .download__grid{ grid-template-columns:1fr; gap:10px; }
  .dl-card{ padding:14px 16px; }

  /* footer */
  .footer{ padding:32px 0; }
  .footer__inner{ flex-direction:column; align-items:flex-start; gap:14px; text-align:left; }
  .footer__links{ flex-wrap:wrap; gap:14px 18px; }
}
@media (max-width: 380px){
  h1{ font-size:30px; }
  .hero__meta{ font-size:12.5px; }
  .plan__price .num{ font-size:36px; }
}