:root{
  --bg:#f7f8fc;
  --panel:#ffffff;
  --panel2:#fbfbfe;
  --text:#0f172a;
  --muted:#516079;
  /* ??????? + ???????? */
  --brand:#ff5a6a;
  --brand2:#60a5fa;
  --ok:#22c55e;
  --warn:#f59e0b;
  --danger:#fb7185;
  --border:rgba(2,6,23,.12);
  --shadow: 0 20px 60px rgba(2,6,23,.08);
  --radius:18px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", Arial, "Noto Sans", "Helvetica Neue", sans-serif;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 18% 10%, rgba(255,90,106,.18), transparent 55%),
    radial-gradient(900px 500px at 85% 5%, rgba(96,165,250,.20), transparent 55%),
    radial-gradient(900px 500px at 55% 100%, rgba(34,197,94,.10), transparent 60%),
    linear-gradient(180deg, #ffffff, var(--bg));
  line-height:1.6;
}

a{color:inherit}
img{max-width:100%;display:block}
code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: .95em;
  color:#334155;
}

.container{width:min(1120px, calc(100% - 40px)); margin:0 auto}
.muted{color:var(--muted)}
.small{font-size:.92rem}

.skip-link{
  position:absolute;
  left:-9999px;
  top:10px;
  padding:10px 12px;
  border:1px solid var(--border);
  background:rgba(255,255,255,.98);
  color:var(--text);
  border-radius:12px;
}
.skip-link:focus{left:12px; z-index:9999}

.site-header{
  position:sticky;
  top:0;
  z-index:50;
  backdrop-filter: blur(10px);
  background:rgba(255,255,255,.82);
  border-bottom:1px solid rgba(2,6,23,.08);
}
.header-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 0;
  gap:16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  font-weight:700;
  letter-spacing:.2px;
}
.brand-img{
  width:30px;
  height:30px;
  border-radius:10px;
  border:1px solid rgba(2,6,23,.10);
  background:rgba(2,6,23,.04);
  object-fit:cover;
  box-shadow: 0 10px 25px rgba(2,6,23,.10);
}
.brand-name{opacity:.98}

.nav{display:flex; align-items:center; gap:10px; flex-wrap:wrap; justify-content:flex-end; max-width:min(760px, 100%)}
.nav a{
  text-decoration:none;
  color:rgba(15,23,42,.88);
  padding:10px 10px;
  border-radius:12px;
  min-height:44px; /* ?????????? */
  display:inline-flex;
  align-items:center;
}
.nav a:hover{background:rgba(2,6,23,.06)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 14px;
  border-radius:14px;
  border:1px solid var(--border);
  text-decoration:none;
  white-space:nowrap;
  user-select:none;
  min-height:44px; /* ??????????/?? */
}
.btn[aria-disabled="true"]{
  opacity:.55;
  cursor:not-allowed;
  pointer-events:none;
}
.btn-primary{
  border-color:rgba(110,231,255,.25);
  border-color:rgba(255,90,106,.30);
  background:linear-gradient(135deg, rgba(255,90,106,.20), rgba(96,165,250,.14));
}
.btn-primary:hover{filter:brightness(1.06)}
.btn-download{
  border-color: rgba(34,197,94,.38);
  background: linear-gradient(135deg, rgba(34,197,94,.26), rgba(96,165,250,.14));
  box-shadow: 0 10px 28px rgba(52,211,153,.10);
}
.btn-download:hover{filter: brightness(1.07)}
.btn-soft{
  background:rgba(2,6,23,.04);
}
.btn-soft:hover{background:rgba(2,6,23,.06)}
.btn-ghost{
  background:transparent;
}
.btn-ghost:hover{background:rgba(2,6,23,.06)}

.download-actions .btn{
  border-color: rgba(52,211,153,.35);
  background: linear-gradient(135deg, rgba(52,211,153,.22), rgba(16,185,129,.14));
  box-shadow: 0 10px 28px rgba(52,211,153,.10);
}
.download-actions .btn:hover{
  filter: brightness(1.07);
}

.hero{
  position:relative;
  background: url('banner2.jpg') center center / cover no-repeat;
  min-height:320px;
  display:flex;
  align-items:flex-end;
  justify-content:center;
  padding:0 20px 32px;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg, transparent 40%, rgba(0,0,0,.45) 100%);
  z-index:0;
}
.hero-buttons{
  position:relative;
  z-index:1;
  display:flex;
  gap:16px;
  flex-wrap:wrap;
  justify-content:center;
}
.btn-hero{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:14px 32px;
  border-radius:12px;
  border:none;
  background:linear-gradient(135deg, #ff5a6a, #e04555);
  color:#fff;
  font-size:1.05rem;
  font-weight:700;
  text-decoration:none;
  white-space:nowrap;
  min-height:48px;
  box-shadow:0 8px 24px rgba(255,90,106,.35);
  transition:transform .15s, box-shadow .15s;
}
.btn-hero:hover{
  transform:translateY(-2px);
  box-shadow:0 12px 32px rgba(255,90,106,.45);
}
@media (max-width:480px){
  .hero{min-height:220px; padding-bottom:24px}
  .btn-hero{padding:12px 24px; font-size:.95rem}
}

h1{
  margin:0 0 14px;
  line-height:1.08;
  font-size: clamp(2.1rem, 4.6vw, 3.2rem);
  letter-spacing:-.6px;
}

.bar{
  height:10px;border-radius:999px;margin:10px 2px 12px;
  background:rgba(255,255,255,.10);
  border:1px solid rgba(255,255,255,.12);
  position:relative;
  overflow:hidden;
}
.bar:after{
  content:"";
  position:absolute; inset:0;
  width:62%;
  background:linear-gradient(90deg, rgba(110,231,255,.55), rgba(167,139,250,.45));
}
.chips{display:flex; gap:8px; flex-wrap:wrap}
.chip{
  padding:8px 10px;
  border-radius:999px;
  border:1px solid rgba(255,255,255,.18);
  background:rgba(255,255,255,.10);
  color:rgba(255,255,255,.88);
  font-size:.9rem;
}
.mini-grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:10px;
  margin-top:12px;
}
.mini-cover{
  width:100%;
  height:auto;
  aspect-ratio:1/1;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.15);
  object-fit:cover;
  background:rgba(0,0,0,.10);
}

/* ???????????????????????????? */
@media (max-width: 720px){
  .mini-grid{grid-template-columns: repeat(2, 1fr)}
}
@media (max-width: 420px){
  .mini-grid{grid-template-columns: 1fr}
}

/* ?????? */
.product-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:20px;
}
@media(max-width:920px){
  .product-grid{grid-template-columns:1fr}
}
.product-card{
  border:1px solid var(--border);
  background:var(--panel);
  border-radius:var(--radius);
  padding:0 0 20px;
  text-align:center;
  overflow:hidden;
  box-shadow:0 12px 36px rgba(2,6,23,.06);
  transition:transform .2s,box-shadow .2s;
}
.product-card:hover{
  transform:translateY(-4px);
  box-shadow:0 18px 48px rgba(2,6,23,.10);
}
.product-logo{
  width:100%;
  height:auto;
  aspect-ratio:16/10;
  object-fit:cover;
  display:block;
  background:linear-gradient(135deg,#f0f4ff,#e8ecf8);
}
.product-card h3{
  margin:16px 20px 6px;
  font-size:1.2rem;
}
.product-card p{
  margin:0 20px 16px;
  font-size:.92rem;
  line-height:1.5;
}
.product-actions{
  display:flex;
  gap:10px;
  justify-content:center;
  padding:0 20px;
}
.product-actions .btn{
  flex:1;
  max-width:140px;
}

.section{padding:44px 0}
.section-alt{
  background:linear-gradient(180deg, rgba(255,255,255,.02), rgba(255,255,255,.00));
  border-top:1px solid rgba(2,6,23,.06);
  border-bottom:1px solid rgba(2,6,23,.06);
}
.section-head{margin-bottom:18px}
.section-head h1{margin:0 0 10px; font-size:clamp(1.75rem, 3.5vw, 2.2rem); letter-spacing:-.3px}
.section-head h2{margin:0 0 8px; font-size:1.6rem; letter-spacing:-.2px}
.section-head p{margin:0}

.cards{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap:14px;
}
@media (max-width: 1100px){
  .cards{grid-template-columns: repeat(2, 1fr)}
}
@media (max-width: 720px){
  .cards{grid-template-columns:1fr}
}
.card{
  border:1px solid rgba(2,6,23,.10);
  background:rgba(255,255,255,.82);
  border-radius:var(--radius);
  padding:16px 16px 14px;
  box-shadow: 0 18px 50px rgba(2,6,23,.06);
}
.card h3{margin:0 0 8px; font-size:1.12rem}
.card p{margin:0 0 10px; color:rgba(15,23,42,.82)}
.ticks{margin:0; padding:0 0 0 18px; color:var(--muted)}

.split{
  display:grid;
  grid-template-columns: .9fr 1.1fr;
  gap:18px;
  align-items:start;
}
@media (max-width: 920px){
  .split{grid-template-columns:1fr}
}

.dl-grid{
  display:grid;
  grid-template-columns:repeat(2, 1fr);
  gap:12px;
}
@media (max-width: 720px){
  .dl-grid{grid-template-columns:1fr}
}
.dl-item{
  border:1px solid rgba(2,6,23,.10);
  background:rgba(255,255,255,.80);
  border-radius:16px;
  padding:14px 14px;
  display:flex;
  gap:12px;
  text-decoration:none;
}
.dl-item:hover{background:rgba(255,255,255,.95)}
.dl-ic{
  width:36px;height:36px;border-radius:12px;
  display:grid; place-items:center;
  border:1px solid rgba(2,6,23,.10);
  background:rgba(2,6,23,.03);
  color:rgba(15,23,42,.88);
  font-weight:700;
}
.dl-name{display:block; font-weight:700}
.dl-sub{display:block; color:var(--muted); font-size:.92rem}

.faq details{
  border:1px solid rgba(2,6,23,.10);
  background:rgba(255,255,255,.86);
  border-radius:16px;
  padding:12px 14px;
  margin-bottom:12px;
}
.faq summary{
  cursor:pointer;
  font-weight:700;
  outline:none;
}
.faq-body{color:rgba(15,23,42,.84); padding-top:8px}
.faq-body p{margin:0}

.download-panel{margin-top:10px}
.download-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:14px;
}
@media (max-width: 980px){
  .download-grid{grid-template-columns:1fr}
}
.download-card{
  border:1px solid rgba(2,6,23,.10);
  background:rgba(255,255,255,.88);
  border-radius:var(--radius);
  padding:16px;
}
.download-card-head h2,
.download-card-head h3{margin:0 0 6px; font-size:1.15rem}
.download-card-head p{margin:0}
.download-actions{display:flex; gap:10px; flex-wrap:wrap; margin:12px 0 12px}
.kv{
  margin:0;
  display:grid;
  grid-template-columns: 1fr;
  gap:8px;
}
.kv > div{
  display:flex;
  justify-content:space-between;
  gap:12px;
  padding:10px 12px;
  border:1px solid rgba(2,6,23,.08);
  border-radius:14px;
  background:rgba(2,6,23,.02);
}
.kv dt{color:var(--muted)}
.kv dd{margin:0; color:rgba(15,23,42,.92)}

.steps{margin:0; padding-left:18px; color:rgba(15,23,42,.88)}

.back-row{margin-top:10px}

.site-footer{
  padding:26px 0 34px;
  border-top:1px solid rgba(2,6,23,.08);
  background:rgba(255,255,255,.75);
}
.footer-row{
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  align-items:flex-start;
}
.footer-brand{display:flex; align-items:center; gap:10px}
.footer-links{display:flex; gap:12px; flex-wrap:wrap}
.footer-links a{
  color:rgba(15,23,42,.78);
  text-decoration:none;
  padding:8px 10px;
  border-radius:12px;
}
.footer-links a:hover{background:rgba(2,6,23,.06)}

@media (prefers-reduced-motion: reduce){
  *{scroll-behavior:auto !important}
}

.reviews{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:14px;
}
@media (max-width: 980px){
  .reviews{grid-template-columns:1fr}
}
.review{
  margin:0;
  border:1px solid rgba(2,6,23,.10);
  background:rgba(255,255,255,.86);
  border-radius:var(--radius);
  padding:14px 14px 12px;
}
.review-top{
  display:flex;
  align-items:center;
  gap:10px;
}
.avatar{
  width:40px;
  height:40px;
  border-radius:14px;
  border:1px solid rgba(2,6,23,.10);
  object-fit:cover;
}
.review blockquote{
  margin:10px 0 0;
  color:rgba(15,23,42,.80);
}

.sr-only{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0,0,0,0);
  white-space:nowrap;
  border:0;
}

.prose-block h2{
  margin:0 0 12px;
  font-size:1.6rem;
  letter-spacing:-.2px;
}
.prose-block h3{
  margin:22px 0 10px;
  font-size:1.12rem;
}
.prose-block p{
  margin:0 0 12px;
  color:rgba(15,23,42,.84);
}
.section-lead{margin:0 0 18px; max-width:78ch}

.spec-wrap{
  overflow-x:auto;
  margin:14px 0 18px;
  border:1px solid rgba(2,6,23,.10);
  border-radius:16px;
}
.spec-table{
  width:100%;
  border-collapse:collapse;
  font-size:.92rem;
}
.spec-table th,
.spec-table td{
  padding:12px 14px;
  border-bottom:1px solid rgba(2,6,23,.08);
  text-align:left;
  vertical-align:top;
}
.spec-table thead th{
  background:rgba(2,6,23,.03);
  color:rgba(15,23,42,.92);
}
.spec-table tbody th[scope="row"]{
  color:rgba(15,23,42,.92);
  font-weight:700;
  width:22%;
}
.spec-table tbody tr:last-child th,
.spec-table tbody tr:last-child td{border-bottom:none}

.faq-articles{display:flex; flex-direction:column; gap:16px}
.faq-item{
  border:1px solid rgba(2,6,23,.10);
  background:rgba(255,255,255,.82);
  border-radius:16px;
  padding:16px 16px 14px;
}
.faq-item h3{margin:0 0 10px; font-size:1.12rem}
.faq-item p{margin:0 0 10px; color:rgba(15,23,42,.84)}
.faq-item p:last-child{margin-bottom:0}

.review-heading{
  margin:0 0 10px;
  font-size:1.05rem;
  font-weight:700;
}
.review .review-name{margin:0; font-weight:700}
.review .review-meta{margin:0; color:var(--muted); font-size:.92rem}
.review .stars{margin:0 0 0 auto; color:rgba(15,23,42,.82); letter-spacing:.8px}

.footer-stack{padding-bottom:8px}
.footer-trust{
  margin-top:16px;
  padding-top:16px;
  border-top:1px solid rgba(2,6,23,.08);
}
.footer-trust p{margin:0 0 10px}
.footer-trust a{text-decoration:underline; text-underline-offset:3px}

/* iTunes ???????? */
.itunes-wrap{
  margin-top:14px;
  overflow-x:auto;
  border:1px solid rgba(2,6,23,.10);
  border-radius:16px;
  background:rgba(2,6,23,.02);
  padding:14px;
}
.itunes-table{
  width:100%;
  border-collapse:collapse;
  font-size:.92rem;
  min-width:680px; /* ?????? */
}
.itunes-table th,
.itunes-table td{
  text-align:left;
  vertical-align:top;
  padding:12px 12px;
  border-bottom:1px solid rgba(2,6,23,.08);
}
.itunes-table th{
  color:rgba(15,23,42,.92);
  font-weight:700;
}
.itunes-table tbody tr:last-child td{border-bottom:none}