:root {
  --ink: #0f1318;
  --ink-2: #39414c;
  --mute: #66707c;
  --line: #e2e5e9;
  --bg: #ffffff;
  --bg-2: #f3f4f6;
  --dark: #0d1015;
  --dark-2: #161a21;
  --dark-line: #262c35;
  --accent: #e8590c;
  --accent-2: #c2410c;
  --wa: #128c4a;
  --radius: 14px;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --gutter: 16px;
  color-scheme: light;
}
.lang-zh { --sans: "IBM Plex Sans", "Noto Sans SC", "PingFang SC", system-ui, sans-serif; }

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); overflow-x: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.015em; margin: 0; text-wrap: balance; }
p, li, dd { text-wrap: pretty; }
.lang-zh h1, .lang-zh h2, .lang-zh h3 { letter-spacing: 0; line-height: 1.3; }
p { margin: 0; }
ul, ol, dl, dd { margin: 0; padding: 0; }

.wrap { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 var(--gutter); }
@media (min-width: 700px) { :root { --gutter: 32px; } }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  min-height: 48px; padding: 0 22px; border: 0; border-radius: 999px;
  background: var(--accent); color: #fff; font: 600 15px/1 var(--sans); text-decoration: none;
  cursor: pointer; transition: background .15s, transform .15s; white-space: nowrap;
}
.btn:hover { background: var(--accent-2); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent); outline-offset: 2px;
}
.btn-sm { min-height: 40px; padding: 0 16px; font-size: 14px; }
.btn-ghost { background: transparent; color: #fff; box-shadow: inset 0 0 0 1.5px rgba(255,255,255,.45); }
.btn-ghost:hover { background: rgba(255,255,255,.08); }
.btn-line { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--line); }
.btn-line:hover { background: var(--bg-2); }
.btn-wa { background: var(--wa); }
.btn-wa:hover { background: #0d7a3f; }

.kicker { display: inline-block; font: 500 12px/1.2 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 12px; }
.kicker-inv { color: #ff8a4c; }
.more { display: inline-flex; gap: .4em; align-items: center; font-weight: 600; font-size: 14px; color: var(--accent-2); }
.more i { font-style: normal; transition: transform .15s; }

/* header */
.hdr { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.94); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.hdr-in { display: flex; align-items: center; gap: 24px; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; flex: none; }
.logo svg { width: 30px; height: 30px; color: var(--ink); }
.logo span { display: flex; flex-direction: column; line-height: 1; }
.logo b { font: 700 19px/1 var(--sans); letter-spacing: .14em; }
.logo small { font: 500 10.5px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--mute); margin-top: 4px; }
.lang-zh .logo small { text-transform: none; letter-spacing: .2em; }
.logo-inv svg { color: #fff; }
.logo-inv b { color: #fff; }
.logo-inv small { color: #9aa3ae; }
.nav { display: flex; gap: 26px; margin-left: 12px; }
.nav a { text-decoration: none; font-weight: 500; font-size: 15px; color: var(--ink-2); }
.nav a:hover { color: var(--ink); }
.nav .nav-quote { display: none; }
.hdr-r { display: flex; align-items: center; gap: 14px; margin-left: auto; }
.langs { display: flex; border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.langs a { font: 500 12.5px/1 var(--mono); padding: 7px 9px; border-radius: 999px; text-decoration: none; color: var(--mute); }
.langs a[aria-current] { background: var(--ink); color: #fff; }
.menu { display: none; width: 44px; height: 44px; border: 0; background: none; padding: 12px 10px; cursor: pointer; flex-direction: column; justify-content: space-between; }
.menu span { display: block; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .2s; }
.menu[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.menu[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

@media (max-width: 900px) {
  .hdr-in { gap: 12px; }
  .menu { display: flex; height: 44px; justify-content: center; gap: 6px; }
  .hdr-cta { display: none; }
  .nav { position: fixed; inset: 64px 0 auto 0; flex-direction: column; gap: 0; margin: 0; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 16px 30px rgba(15,19,24,.08); transform: translateY(-8px); opacity: 0; visibility: hidden; transition: .18s; }
  .nav.open { transform: none; opacity: 1; visibility: visible; }
  .nav a { padding: 16px var(--gutter); border-top: 1px solid var(--line); font-size: 17px; }
  .nav .nav-quote { display: block; color: var(--accent-2); font-weight: 600; }
}
@media (max-width: 420px) {
  .logo small { display: none; }
  .langs a { padding: 7px 7px; }
}

/* hero */
.hero { position: relative; background: var(--dark); color: #fff; overflow: hidden; isolation: isolate; }
.hero-img { position: absolute; inset: 0; z-index: -1; }
.hero-img img, .hero-img .ph { width: 100%; height: 100%; object-fit: cover; object-position: 100% 50%; }
.hero-img::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, var(--dark) 0%, rgba(13,16,21,.7) 22%, rgba(13,16,21,0) 48%); }
@media (min-width: 701px) { .hero-img { left: 30%; } }
.hero-in { padding-top: clamp(72px, 10vw, 128px); padding-bottom: clamp(72px, 10vw, 128px); max-width: 1200px; }
.hero h1 { font-size: clamp(2.1rem, 4.1vw, 3.4rem); font-weight: 700; max-width: 12.5em; }
.lang-zh .hero h1 { max-width: 11em; word-break: keep-all; overflow-wrap: anywhere; }
.hero .lead { margin-top: 20px; font-size: clamp(1.02rem, 1.4vw, 1.15rem); color: #c9cfd6; max-width: 31em; }
@media (min-width: 701px) and (max-width: 1100px) { .hero h1, .hero .lead { max-width: 58vw; } }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
@media (max-width: 700px) {
  .hero { display: flex; flex-direction: column-reverse; }
  .hero-img { position: relative; inset: auto; aspect-ratio: 16 / 10; }
  .hero-img img { object-position: 92% 60%; }
  .hero-img::after { background: linear-gradient(0deg, rgba(13,16,21,1) 0%, rgba(13,16,21,0) 45%); }
  .hero-in { padding-top: 40px; padding-bottom: 8px; }
  .hero-cta .btn { flex: 1 1 auto; }
}

.facts { background: var(--dark-2); color: #dfe3e8; border-top: 1px solid var(--dark-line); }
.facts ul { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); }
.facts li { padding: 18px 0 18px 18px; font-size: 14.5px; font-weight: 500; position: relative; }
.facts li::before { content: ""; position: absolute; left: 0; top: 50%; width: 8px; height: 8px; margin-top: -4px; background: var(--accent); transform: rotate(45deg); }
.facts li + li { margin-left: 24px; }
@media (max-width: 700px) {
  .facts ul { grid-template-columns: 1fr; padding-top: 12px; padding-bottom: 20px; }
  .facts li { padding: 8px 0 8px 18px; }
  .facts li + li { margin-left: 0; }
}

/* sections */
.sec { padding: clamp(64px, 9vw, 112px) 0; }
.sec-alt { background: var(--bg-2); }
.sec-dark { background: var(--dark); color: #fff; }
.sec-hd { max-width: 46em; margin-bottom: clamp(32px, 4vw, 48px); }
.sec-hd h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); }
.sec-hd p { margin-top: 14px; color: var(--mute); font-size: 1.05rem; }

.group + .group { margin-top: clamp(56px, 7vw, 88px); }
.group-hd { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 20px; padding-bottom: 16px; margin-bottom: 24px; border-bottom: 2px solid var(--ink); }
.group-hd h3 { font-size: clamp(1.3rem, 2vw, 1.6rem); }
.group-hd p { color: var(--mute); font-size: 15px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr 1fr; gap: 12px; } }

.card { display: flex; flex-direction: column; text-decoration: none; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: border-color .15s, box-shadow .2s, transform .2s; }
.card:hover { border-color: #c9ced5; box-shadow: 0 14px 34px rgba(15,19,24,.09); transform: translateY(-2px); }
.card:hover .more i { transform: translateX(3px); }
.card-img { aspect-ratio: 1; background: #fff; border-bottom: 1px solid var(--line); overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.card:hover .card-img img { transform: scale(1.035); }
.card-body { display: flex; flex-direction: column; gap: 8px; padding: 18px 18px 20px; flex: 1; }
.card h3 { font-size: 1.12rem; font-weight: 600; }
.card-body > p { color: var(--mute); font-size: 14.5px; line-height: 1.5; }
.chips { display: grid; gap: 8px; margin: 6px 0 12px; }
.chips div { display: grid; gap: 1px; padding-top: 8px; border-top: 1px dashed var(--line); }
.chips dt { color: var(--mute); font-size: 12.5px; }
.chips dd { font: 500 13.5px/1.45 var(--mono); color: var(--ink); }
.card .more { margin-top: auto; }
@media (max-width: 560px) {
  .card-body { padding: 12px 12px 14px; gap: 6px; }
  .card h3 { font-size: .98rem; }
  .card-body > p { font-size: 13px; }
  .chips { display: none; }
  .card .more { font-size: 13px; }
}

.ph { background: repeating-linear-gradient(135deg, #f1f2f4 0 12px, #e9ebee 12px 24px); width: 100%; height: 100%; aspect-ratio: 1; }

/* features */
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.feature { display: grid; grid-template-columns: 200px 1fr; text-decoration: none; background: #fff; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); transition: box-shadow .2s; }
.feature:hover { box-shadow: 0 14px 34px rgba(15,19,24,.09); }
.feature:hover .more i { transform: translateX(3px); }
.feature-img { background: #fff; align-self: center; }
.feature-body { padding: 28px 28px 28px 8px; display: flex; flex-direction: column; gap: 10px; }
.feature h3 { font-size: 1.35rem; }
.feature p { color: var(--ink-2); font-size: 15px; }
.feature .kicker { margin-bottom: 0; }
@media (max-width: 960px) { .features { grid-template-columns: 1fr; } }
@media (max-width: 560px) {
  .feature { grid-template-columns: 1fr; }
  .feature-img { max-width: 260px; margin: 8px auto 0; }
  .feature-body { padding: 4px 20px 24px; }
}

/* steps */
.steps { list-style: none; counter-reset: s; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.steps li { counter-increment: s; padding: 24px 22px 26px; border: 1px solid var(--line); border-radius: var(--radius); position: relative; }
.steps li::before { content: "0" counter(s); display: block; font: 500 13px/1 var(--mono); color: var(--accent-2); margin-bottom: 18px; }
.steps b { display: block; font-size: 1.1rem; margin-bottom: 8px; }
.steps p { color: var(--mute); font-size: 15px; }
@media (max-width: 960px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; gap: 12px; } }

/* why */
.sec-dark .sec-hd h2 { color: #fff; }
.why { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--dark-line); border: 1px solid var(--dark-line); border-radius: var(--radius); overflow: hidden; }
.why li { background: var(--dark); padding: 28px 24px 30px; }
.why b { display: block; font-size: 1.1rem; margin-bottom: 10px; color: #fff; }
.why b::before { content: ""; display: block; width: 22px; height: 3px; background: var(--accent); margin-bottom: 18px; }
.why p { color: #aab2bc; font-size: 15px; }
@media (max-width: 960px) { .why { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .why { grid-template-columns: 1fr; } }

/* quote form */
.quote { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.quote-hd h2 { font-size: clamp(1.8rem, 3.2vw, 2.6rem); }
.quote-hd p { margin-top: 14px; color: var(--mute); font-size: 1.05rem; max-width: 26em; }
@media (max-width: 860px) { .quote { grid-template-columns: 1fr; } }
.qform { display: grid; gap: 16px; background: var(--bg-2); border-radius: var(--radius); padding: clamp(20px, 3vw, 32px); }
.frow { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 560px) { .frow { grid-template-columns: 1fr; } }
.qform label { display: grid; gap: 6px; font-size: 14px; font-weight: 500; color: var(--ink-2); }
.qform input, .qform select, .qform textarea {
  width: 100%; min-height: 46px; padding: 10px 12px; border: 1px solid #d3d8de; border-radius: 10px;
  background: #fff; color: var(--ink); font: 16px/1.4 var(--sans);
}
.qform textarea { resize: vertical; min-height: 110px; }
.qform input:invalid[data-touched], .qform input[aria-invalid="true"] { border-color: #d92d20; }
.factions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 4px; }
.fnote { font-size: 13px; color: var(--mute); }
.pending, .fmsg { font-size: 14px; color: #8a4b00; background: #fff4e5; border-radius: 10px; padding: 10px 12px; }

/* product page */
.pmain { padding: 24px 0 clamp(64px, 9vw, 112px); }
.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; color: var(--mute); margin-bottom: 24px; }
.crumbs a { text-decoration: none; color: var(--ink-2); }
.crumbs a:hover { color: var(--accent-2); }
.prod { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.prod-img { position: sticky; top: 88px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; }
.prod-img img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.prod-info h1 { font-size: clamp(1.9rem, 3.4vw, 2.8rem); }
.prod-info .lead { font-size: 1.15rem; color: var(--ink-2); margin: 12px 0 18px; font-weight: 500; }
.prod-info > p { color: var(--ink-2); }
.pblock { margin-top: 36px; }
.pblock h2 { font-size: 13px; font-family: var(--mono); font-weight: 500; letter-spacing: .08em; text-transform: uppercase; color: var(--mute); margin-bottom: 14px; }
.lang-zh .pblock h2 { letter-spacing: .12em; }
.specs { border-top: 2px solid var(--ink); }
.specs div { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.specs dt { color: var(--ink-2); font-size: 15px; }
.specs dd { font: 500 15px/1.5 var(--sans); font-variant-numeric: tabular-nums; }
@media (max-width: 560px) {
  .specs div { grid-template-columns: 1fr; gap: 2px; padding: 12px 0; }
  .specs dt { font-size: 13.5px; color: var(--mute); }
}
.note { font-size: 13px; color: var(--mute); margin-top: 10px; }
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.tags li { font-size: 14px; padding: 7px 12px; border-radius: 999px; background: var(--bg-2); border: 1px solid var(--line); }
.ticks { list-style: none; display: grid; gap: 8px; }
.ticks li { position: relative; padding-left: 22px; color: var(--ink-2); }
.ticks li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 7px; height: 7px; background: var(--accent); transform: rotate(45deg); }
.pcta { margin-top: 40px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 24px; background: var(--dark); color: #fff; border-radius: var(--radius); }
.pcta b { font-size: 1.1rem; }
.pcta p { color: #aab2bc; font-size: 14px; margin-top: 4px; }
.related { margin-top: clamp(64px, 8vw, 96px); }
.related h2 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); padding-bottom: 16px; margin-bottom: 24px; border-bottom: 2px solid var(--ink); }
@media (max-width: 860px) {
  .prod { grid-template-columns: 1fr; }
  .prod-img { position: static; max-width: 560px; }
}

/* footer */
.ftr { background: var(--dark); color: #aab2bc; padding: 56px 0 32px; font-size: 14px; }
.ftr-in { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; }
.ftr-brand p { margin-top: 16px; max-width: 30em; }
.ftr-links { list-style: none; display: grid; gap: 10px; align-content: start; }
.ftr-links a { text-decoration: none; color: #dfe3e8; }
.ftr-links a:hover { color: #fff; }
.ftr-fine { grid-column: 1 / -1; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 24px; border-top: 1px solid var(--dark-line); font-size: 13px; color: #7d8793; }
@media (max-width: 700px) { .ftr-in { grid-template-columns: 1fr; } }

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