:root {
  --brand: #12a594;
  --brand-dark: #0b7a6e;
  --brand-light: #e3f5f2;
  --accent: #f0883a;
  --ink: #1b1f24;
  --ink-sub: #5b636e;
  --ink-faint: #9aa1ac;
  --line: #ebeef1;
  --bg: #f3f5f7;
  --card: #ffffff;
  --shadow: 0 10px 30px rgba(17, 32, 39, .10);
  --shadow-sm: 0 2px 10px rgba(17, 32, 39, .07);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef2f5;
    --ink-sub: #b3bcc7;
    --ink-faint: #8b95a1;
    --line: #2a3038;
    --bg: #12161a;
    --card: #1a1f26;
    --brand-light: #14312e;
    --shadow: 0 10px 30px rgba(0, 0, 0, .45);
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 18px; }
.muted { color: var(--ink-sub); }
.faint { color: var(--ink-faint); }
.hidden { display: none !important; }

/* ---------- top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 30;
  background: var(--card);
  background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-in { display: flex; align-items: center; gap: 14px; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; color: var(--ink); }
.logo:hover { text-decoration: none; }
.logo .mark {
  width: 32px; height: 32px; border-radius: 9px; flex: none;
  background: var(--brand); color: #fff; display: grid; place-items: center;
  font-size: 15px; font-weight: 800; box-shadow: var(--shadow-sm);
}
.nav-links { display: none; gap: 22px; margin-left: 12px; }
.nav-links a { color: var(--ink-sub); font-size: 15px; }
.nav-links a:hover { color: var(--brand-dark); text-decoration: none; }
.nav .spacer { flex: 1; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 999px; font-size: 15px; font-weight: 700;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 8px 20px rgba(18, 165, 148, .32); }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-ghost { background: var(--card); color: var(--ink); border-color: var(--line); box-shadow: var(--shadow-sm); }
.btn-dark { background: var(--ink); color: var(--card); }
.btn-sm { padding: 8px 15px; font-size: 14px; }
.btn small { font-weight: 500; opacity: .8; }

/* ---------- hero ---------- */
.hero { padding: 34px 0 12px; }
.hero-grid { display: grid; gap: 30px; align-items: center; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap;
  background: var(--brand-light); color: var(--brand-dark);
  border: 1px solid color-mix(in srgb, var(--brand) 22%, transparent);
  padding: 5px 13px; border-radius: 999px; font-size: 13px; font-weight: 700; margin: 0 0 16px;
}
h1 { font-size: clamp(29px, 6.2vw, 46px); line-height: 1.22; margin: 0 0 12px; letter-spacing: -0.5px; }
h1 em { font-style: normal; color: var(--brand); }
.lead { font-size: clamp(15px, 2.4vw, 18px); color: var(--ink-sub); margin: 0 0 22px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 18px; }
.hero-note { font-size: 13px; color: var(--ink-faint); margin: 0; }
.hero-note b { color: var(--ink-sub); font-weight: 600; }
.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 26px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 8px; text-align: center; box-shadow: var(--shadow-sm); }
.stat b { display: block; font-size: clamp(18px, 4.4vw, 24px); color: var(--brand-dark); line-height: 1.3; }
.stat span { font-size: 12px; color: var(--ink-faint); }

/* ---------- phone mockup ---------- */
.phone {
  position: relative; width: min(280px, 100%); max-width: 280px; aspect-ratio: 9 / 19; margin: 0 auto;
  border-radius: 34px; padding: 10px;
  background: linear-gradient(160deg, #2b323a, #10141a);
  box-shadow: 0 26px 60px rgba(10, 20, 25, .35), inset 0 0 0 1px rgba(255, 255, 255, .08);
}
.phone .screen {
  position: relative; width: 100%; height: 100%; overflow: hidden;
  border-radius: 26px; background: #f3f5f7; display: flex; flex-direction: column;
  font-size: 11px; color: #1b1f24;
}
.p-top { background: var(--brand); color: #fff; padding: 8px 10px 6px; flex: none; }
.p-status { display: flex; justify-content: space-between; font-size: 8px; opacity: .85; letter-spacing: .3px; }
.p-cityrow { display: flex; align-items: center; gap: 6px; padding: 6px 0 2px; font-weight: 700; font-size: 12px; }
.p-search { flex: 1; background: rgba(255, 255, 255, .22); border-radius: 999px; padding: 3px 9px; font-size: 10px; opacity: .95; }
.p-tabs { display: flex; gap: 12px; padding: 6px 10px 0; font-size: 11px; color: var(--ink-sub); flex: none; background: #fff; }
.p-tabs i { font-style: normal; position: relative; padding-bottom: 5px; }
.p-tabs i.on { color: var(--brand-dark); font-weight: 800; }
.p-tabs i.on::after { content: ""; position: absolute; left: 20%; right: 20%; bottom: 0; height: 3px; border-radius: 3px; background: var(--brand); }
.p-chips { display: flex; gap: 5px; padding: 7px 10px; flex: none; }
.p-chips span { background: #fff; border: 1px solid var(--line); color: var(--ink-sub); border-radius: 999px; padding: 2px 8px; font-size: 9px; white-space: nowrap; }
.p-chips span.on { background: var(--brand-light); color: var(--brand-dark); border-color: transparent; font-weight: 700; }
.p-body { flex: 1; overflow: hidden; padding: 0 8px 8px; display: flex; flex-direction: column; gap: 7px; }
.p-card { background: #fff; border-radius: 10px; padding: 8px; box-shadow: 0 1px 4px rgba(20, 30, 40, .07); }
.p-row { display: flex; gap: 7px; align-items: flex-start; }
.p-thumb { width: 44px; height: 34px; border-radius: 6px; flex: none; background: linear-gradient(135deg, #cfe9e4, #a9d7cf); }
.p-thumb.b { background: linear-gradient(135deg, #ffe2c9, #f7c58f); }
.p-thumb.c { background: linear-gradient(135deg, #d7e3ff, #b4c8f5); }
.p-l { height: 7px; border-radius: 4px; background: #e7ebef; }
.p-l.t { height: 9px; background: #c9d1d8; width: 92%; }
.p-l.s { width: 62%; }
.p-l.xs { width: 34%; }
.p-stack { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.p-tag { display: inline-block; font-size: 8px; color: var(--brand-dark); background: var(--brand-light); border-radius: 4px; padding: 1px 5px; margin-right: 4px; }
.p-tag.hot { color: #b4551b; background: #ffe9d6; }
.p-price { color: var(--accent); font-weight: 800; font-size: 11px; }
.p-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; }
.p-cell { background: #fff; border-radius: 9px; padding: 7px 2px; text-align: center; box-shadow: 0 1px 4px rgba(20, 30, 40, .06); }
.p-dot { width: 20px; height: 20px; border-radius: 7px; margin: 0 auto 4px; background: var(--brand-light); }
.p-dot.o { background: #ffe9d6; }
.p-dot.b { background: #dde7ff; }
.p-dot.g { background: #dff3e6; }
.p-cell span { font-size: 8px; color: var(--ink-sub); }
.p-banner { height: 62px; border-radius: 10px; background: linear-gradient(120deg, var(--brand), #37c0a8); color: #fff; display: flex; align-items: center; padding: 0 10px; font-size: 10px; font-weight: 700; }
.p-nav { flex: none; display: grid; grid-template-columns: repeat(5, 1fr); background: #fff; border-top: 1px solid #eceff2; padding: 4px 0 6px; }
.p-nav i { font-style: normal; text-align: center; font-size: 9px; color: var(--ink-faint); }
.p-nav i b { display: block; width: 15px; height: 15px; margin: 0 auto 2px; border-radius: 5px; background: #d8dee4; }
.p-nav i.on { color: var(--brand-dark); font-weight: 800; }
.p-nav i.on b { background: var(--brand); }
.p-nav i.pub b { background: var(--accent); }
.p-hero { height: 58px; border-radius: 10px; background: linear-gradient(135deg, #1b1f24, #37424d); color: #fff; padding: 8px; display: flex; flex-direction: column; justify-content: flex-end; gap: 4px; }
.p-line { display: flex; justify-content: space-between; align-items: center; font-size: 9px; color: var(--ink-faint); }
.p-ava { width: 22px; height: 22px; border-radius: 50%; background: linear-gradient(135deg, #bcd8d2, #8fc2b8); flex: none; }
.p-ava.o { background: linear-gradient(135deg, #ffd7b0, #f2b077); }
.p-sec { display: flex; justify-content: space-between; align-items: center; font-size: 10px; font-weight: 800; color: #333; padding: 2px 2px 0; }
.p-sec small { font-weight: 500; color: var(--ink-faint); font-size: 8px; }

/* ---------- sections ---------- */
section { padding: 46px 0; }
.sec-head { margin-bottom: 26px; }
.kicker { color: var(--brand); font-weight: 800; font-size: 13px; letter-spacing: 1px; margin: 0 0 6px; }
h2 { font-size: clamp(22px, 4.4vw, 31px); margin: 0 0 10px; letter-spacing: -0.3px; }
h3 { font-size: 17px; margin: 0 0 6px; }
.sec-head p { color: var(--ink-sub); margin: 0; max-width: 62ch; }
.band { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.grid { display: grid; gap: 16px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 210px), 1fr)); }

.f-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm); }
.f-card .ico { width: 40px; height: 40px; border-radius: 12px; background: var(--brand-light); color: var(--brand-dark); display: grid; place-items: center; margin-bottom: 12px; }
.f-card .ico svg { width: 22px; height: 22px; }
.f-card p { margin: 0; color: var(--ink-sub); font-size: 14px; }
.f-card h3 { font-size: 16px; }
.band .f-card { background: var(--bg); }

.chip-row { display: flex; flex-wrap: wrap; gap: 9px; margin: 0 0 20px; }
.chip { background: var(--card); border: 1px solid var(--line); border-radius: 999px; padding: 7px 15px; font-size: 14px; color: var(--ink-sub); }
.chip.on { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 700; }
.chip.accent { background: #fff3e6; border-color: #ffd9b3; color: #b4551b; font-weight: 700; }

/* screens gallery */
.rail { display: grid; grid-auto-flow: column; grid-auto-columns: min(280px, 78vw); gap: 22px; overflow-x: auto; padding: 6px 4px 18px; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; }
.rail > figure { margin: 0; min-width: 0; scroll-snap-align: center; }
.rail figcaption { text-align: center; font-size: 13px; color: var(--ink-sub); margin-top: 10px; font-weight: 600; }
.rail::-webkit-scrollbar { height: 6px; }
.rail::-webkit-scrollbar-thumb { background: #c6cfd6; border-radius: 6px; }

/* download box */
.dl-grid { display: grid; gap: 22px; align-items: start; }
.dl-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.qr-box { text-align: center; padding: 18px; border: 1px dashed color-mix(in srgb, var(--brand) 40%, transparent); border-radius: var(--radius); background: #fff; }
.qr-box img { width: 168px; height: 168px; margin: 0 auto 10px; image-rendering: pixelated; }
.qr-box p { margin: 0; font-size: 13px; color: var(--ink-sub); }
.qr-box b { display: block; color: var(--ink); font-size: 14px; margin-bottom: 6px; }
.meta-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.meta-table th, .meta-table td { padding: 9px 4px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.meta-table th { color: var(--ink-faint); font-weight: 600; width: 8.5em; }
.meta-table td { word-break: break-all; color: var(--ink); }
.steps { margin: 0; padding-left: 20px; color: var(--ink-sub); font-size: 14px; }
.steps li { margin-bottom: 7px; }
.steps li b { color: var(--ink); }

/* devices */
.devices { display: grid; gap: 24px; align-items: end; justify-items: center; }
.devices > figure { min-width: 0; width: 100%; }
.tablet { width: min(420px, 100%); max-width: 420px; aspect-ratio: 4 / 3; border-radius: 24px; padding: 12px; background: linear-gradient(160deg, #2b323a, #10141a); box-shadow: 0 22px 50px rgba(10, 20, 25, .3); }
.tablet .screen { width: 100%; height: 100%; border-radius: 14px; background: #f3f5f7; overflow: hidden; display: flex; font-size: 11px; }
.t-side { width: 30%; background: #fff; border-right: 1px solid #eceff2; padding: 8px; display: flex; flex-direction: column; gap: 5px; }
.t-side i { font-style: normal; font-size: 9px; color: var(--ink-faint); text-align: center; padding: 4px 0; border-radius: 6px; }
.t-side i.on { background: var(--brand-light); color: var(--brand-dark); font-weight: 800; }
.t-main { flex: 1; padding: 8px; display: flex; flex-direction: column; gap: 6px; overflow: hidden; }
.win { width: min(560px, 100%); max-width: 560px; aspect-ratio: 16 / 10; border-radius: 14px; padding: 8px 8px 10px; background: linear-gradient(160deg, #2b323a, #10141a); box-shadow: 0 22px 50px rgba(10, 20, 25, .3); }
.win .screen { width: 100%; height: 100%; border-radius: 8px; background: #fff; overflow: hidden; display: flex; flex-direction: column; font-size: 11px; }
.win-bar { height: 16px; background: #eef1f4; display: flex; align-items: center; gap: 4px; padding: 0 6px; flex: none; }
.win-bar u { width: 6px; height: 6px; border-radius: 50%; background: #cfd6dd; text-decoration: none; }

/* faq */
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 14px 16px; margin-bottom: 10px; }
.faq summary { font-weight: 700; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+"; color: var(--brand); font-weight: 800; margin-right: 9px; }
.faq details[open] summary::before { content: "−"; }
.faq p { margin: 8px 0 0; color: var(--ink-sub); font-size: 14px; }

.note { background: var(--brand-light); border: 1px solid color-mix(in srgb, var(--brand) 20%, transparent); color: var(--brand-dark); border-radius: var(--radius-sm); padding: 14px 16px; font-size: 14px; }
.warn { background: #fff6ec; border: 1px solid #ffd9b3; color: #8a4514; }
.band .note { background: var(--card); }

/* footer */
footer { background: #12181d; color: #a9b4bf; padding: 34px 0 90px; font-size: 14px; }
footer a { color: #cfe1dc; }
.f-grid { display: grid; gap: 22px; }
.f-grid h4 { color: #fff; font-size: 15px; margin: 0 0 10px; }
.f-grid ul { margin: 0; padding-left: 18px; }
.f-grid li { margin-bottom: 6px; }
.f-bottom { border-top: 1px solid #232c33; margin-top: 22px; padding-top: 16px; font-size: 13px; color: #7d8894; }

/* sticky mobile cta */
.sticky {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  background: var(--card);
  background: color-mix(in srgb, var(--card) 94%, transparent);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  box-shadow: 0 -6px 20px rgba(10, 20, 25, .08);
}
.sticky .txt { flex: 1; min-width: 0; }
.sticky .txt b { display: block; font-size: 14px; }
.sticky .txt span { font-size: 12px; color: var(--ink-faint); }

/* ---------- breakpoints ---------- */
@media (max-width: 767px) {
  section { padding: 34px 0; }
  footer { padding-bottom: 100px; }
}

@media (max-width: 380px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .nav-in { gap: 8px; }
  section { padding: 28px 0; }
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
  .hero { padding-top: 48px; }
  .stats-row { grid-template-columns: repeat(4, 1fr); max-width: 560px; }
  .dl-grid { grid-template-columns: 300px 1fr; }
  .f-grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
}

@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: 1.05fr .95fr; gap: 40px; }
  .sticky { display: none; }
  .rail { display: grid; grid-auto-flow: initial; grid-template-columns: repeat(3, minmax(0, 1fr)); overflow: visible; gap: 26px; }
  .devices { grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: center; }
}