:root {
  --bg: #070311;
  --bg-2: #0d0619;
  --plum: #130923;
  --panel: #1a0d2d;
  --ink: #f7f2ff;
  --muted: #a99bbd;
  --dim: #6f6380;
  --lav: #c3a5ff;
  --lav-2: #8d6be8;
  --rose: #ff87be;
  --mint: #84e4d3;
  --line: rgba(255,255,255,.12);
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;
  --sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--sans); font-size: 18px; line-height: 1.7; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; border: 0; background: none; cursor: pointer; }
::selection { background: var(--lav); color: var(--bg); }
:focus-visible { outline: 3px solid var(--rose); outline-offset: 3px; }

.container { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.section { padding: 64px 0; background: var(--bg); }
.section-plum { background: var(--bg-2); }

.age-bar { height: 32px; display: flex; align-items: center; justify-content: center; background: #030108; color: rgba(255,255,255,.38); font-size: 10px; letter-spacing: .05em; }

/* header */
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(7,3,17,.88); border-bottom: 1px solid var(--line); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); }
.header-inner { display: flex; align-items: center; gap: 20px; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 9px; flex: 0 0 auto; }
.brand img { width: 36px; height: 36px; border-radius: 9px; object-fit: cover; box-shadow: 0 0 20px rgba(195,165,255,.25); }
.brand b { font-family: var(--serif); font-size: 20px; letter-spacing: .02em; }
.nav { display: flex; gap: 19px; margin-left: auto; }
.nav a { color: var(--muted); font-size: 13px; }
.nav a:hover { color: var(--lav); }
.header-cta { padding: 9px 18px; border-radius: 999px; background: linear-gradient(135deg, var(--lav), var(--rose)); color: #160a26; font-size: 12px; font-weight: 800; white-space: nowrap; }
.header-cta:hover { filter: brightness(1.08); }
.menu-btn { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 10px; }
.menu-btn i { position: relative; display: block; width: 17px; height: 1.5px; background: #fff; }
.menu-btn i::before, .menu-btn i::after { content: ""; position: absolute; left: 0; width: 17px; height: 1.5px; background: #fff; transition: transform .2s ease; }
.menu-btn i::before { top: -6px; }
.menu-btn i::after { top: 6px; }
.menu-btn[aria-expanded="true"] i { background: transparent; }
.menu-btn[aria-expanded="true"] i::before { transform: translateY(6px) rotate(45deg); }
.menu-btn[aria-expanded="true"] i::after { transform: translateY(-6px) rotate(-45deg); }
.mobile-nav { display: none; padding: 8px 20px 18px; background: var(--bg-2); border-top: 1px solid var(--line); }
.mobile-nav.is-open { display: block; }
.mobile-nav a { display: block; padding: 11px 2px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.mobile-nav .header-cta { margin-top: 12px; color: #160a26; }

/* hero */
.hero { position: relative; overflow: hidden; padding: 64px 0 58px; background: radial-gradient(circle at 82% 20%, rgba(141,107,232,.26), transparent 38%), radial-gradient(circle at 60% 100%, rgba(255,135,190,.09), transparent 45%), var(--bg); }
.hero-orb { position: absolute; border-radius: 50%; filter: blur(2px); pointer-events: none; }
.orb-a { width: 420px; height: 420px; right: -140px; top: 20px; background: radial-gradient(circle, rgba(195,165,255,.18), transparent 65%); }
.orb-b { width: 300px; height: 300px; left: -120px; bottom: -80px; background: radial-gradient(circle, rgba(255,135,190,.12), transparent 65%); }
.hero-grid { position: relative; z-index: 2; display: grid; grid-template-columns: 1.02fr .98fr; gap: 30px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 7px; margin: 0 0 10px; color: var(--lav); font-family: var(--mono); font-size: 9px; letter-spacing: .11em; }
.eyebrow span { width: 6px; height: 6px; border-radius: 50%; background: var(--rose); box-shadow: 0 0 12px var(--rose); }
.hero h1 { margin: 0 0 4px; font-family: var(--serif); font-size: clamp(62px, 7vw, 96px); line-height: .98; letter-spacing: -.02em; font-weight: 700; }
.hero-sub { margin: 0 0 15px; font-family: var(--serif); font-size: clamp(25px, 3vw, 36px); line-height: 1.42; letter-spacing: -.02em; color: rgba(255,255,255,.9); }
.hero-sub br { display: none; }
.hero-desc { max-width: 520px; margin: 0 0 19px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.actions { display: flex; flex-wrap: wrap; gap: 9px; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 21px; border: 1.5px solid transparent; border-radius: 999px; font-size: 13px; font-weight: 800; transition: transform .18s ease, filter .18s ease; }
.btn:hover { transform: translateY(-2px); }
.btn-glow { background: linear-gradient(135deg, var(--lav), var(--rose)); color: #170a26; }
.btn-glow:hover { filter: brightness(1.08); }
.btn-line { border-color: rgba(255,255,255,.22); color: var(--ink); }
.btn-line:hover { border-color: var(--lav); color: var(--lav); }
.hero-note { margin: 12px 0 0; color: var(--dim); font-size: 10px; }

.hero-stage { position: relative; justify-self: center; width: min(360px, 100%); }
.phone { position: relative; width: 100%; padding: 10px; border: 1px solid rgba(255,255,255,.18); border-radius: 34px; background: linear-gradient(160deg, #211237, #0b0617); box-shadow: 0 36px 80px -30px rgba(0,0,0,.9), 0 0 0 1px rgba(195,165,255,.08) inset; }
.phone::before { content: ""; position: absolute; top: 7px; left: 50%; transform: translateX(-50%); width: 76px; height: 4px; border-radius: 999px; background: rgba(255,255,255,.16); }
.phone-top { display: flex; align-items: center; gap: 9px; padding: 17px 10px 11px; border-bottom: 1px solid var(--line); }
.phone-top img { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.phone-top b { display: block; font-size: 12px; line-height: 1.2; }
.phone-top span { display: block; color: var(--mint); font-size: 8px; }
.phone-top i { margin-left: auto; color: var(--dim); font-style: normal; letter-spacing: 2px; }
.chat { min-height: 330px; padding: 14px 10px; background: radial-gradient(circle at 50% 0, rgba(141,107,232,.1), transparent 60%); }
.msg { display: flex; margin-bottom: 10px; }
.msg .bubble { max-width: 84%; padding: 10px 12px; border-radius: 13px; font-size: 10.5px; line-height: 1.7; }
.msg.ai .bubble { background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.1); border-bottom-left-radius: 3px; color: rgba(255,255,255,.82); }
.msg.user { justify-content: flex-end; }
.msg.user .bubble { background: linear-gradient(135deg, rgba(195,165,255,.85), rgba(255,135,190,.78)); border-bottom-right-radius: 3px; color: #1a0b29; }
.typing { display: flex; align-items: center; gap: 3px; padding: 3px 0 0; color: var(--dim); font-size: 7px; }
.typing i { width: 4px; height: 4px; border-radius: 50%; background: var(--lav); opacity: .6; }
.typing span { margin-left: 5px; }
.chat-input { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 4px 8px 8px; padding: 10px 11px; border: 1px solid var(--line); border-radius: 999px; color: var(--dim); font-size: 9px; }
.chat-input b { display: inline-flex; width: 22px; height: 22px; align-items: center; justify-content: center; border-radius: 50%; background: var(--lav); color: #160a26; font-size: 12px; }
.float-tag { position: absolute; padding: 5px 9px; border: 1px solid rgba(195,165,255,.28); border-radius: 999px; background: rgba(19,9,35,.85); color: var(--lav); font-family: var(--mono); font-size: 8px; }
.t1 { right: -56px; top: 84px; }
.t2 { left: -46px; top: 238px; }
.float-note { position: absolute; right: -28px; bottom: 10px; color: var(--dim); font-family: var(--mono); font-size: 7px; }

/* stats */
.stats { background: linear-gradient(90deg, #170b28, #0b0616 55%, #170b28); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); }
.stats-grid div { padding: 22px 16px; border-left: 1px solid var(--line); }
.stats-grid div:first-child { border-left: 0; padding-left: 0; }
.stats-grid b { display: block; font-family: var(--serif); font-size: 32px; line-height: 1; }
.stats-grid b em { color: var(--rose); font-family: var(--sans); font-size: 13px; font-style: normal; }
.stats-grid span { display: block; margin-top: 3px; color: var(--dim); font-size: 9px; }

/* heads */
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 22px; margin-bottom: 26px; }
.kicker { margin: 0 0 7px; color: var(--lav); font-family: var(--mono); font-size: 9px; letter-spacing: .09em; }
.section-head h2 { margin: 0 0 6px; font-family: var(--serif); font-size: clamp(30px, 3.5vw, 46px); font-weight: 700; line-height: 1.18; letter-spacing: -.02em; }
.section-head h2 em { color: var(--rose); font-style: normal; }
.section-head p:not(.kicker) { max-width: 700px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.text-link { flex: 0 0 auto; color: var(--lav); font-family: var(--mono); font-size: 10px; }

/* why */
.why-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.why-card { padding: 24px; border: 1px solid var(--line); border-radius: 10px; background: linear-gradient(160deg, rgba(255,255,255,.045), rgba(255,255,255,.015)); }
.why-card > span { color: var(--rose); font-family: var(--mono); font-size: 9px; }
.why-card h3 { margin: 6px 0 5px; font-family: var(--serif); font-size: 24px; font-weight: 700; }
.why-card p { margin: 0; color: var(--muted); font-size: 11.5px; line-height: 1.85; }

/* characters */
.char-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.char-card { padding: 18px; border: 1px solid var(--line); border-radius: 10px; background: linear-gradient(150deg, rgba(255,255,255,.05), rgba(255,255,255,.01)); transition: transform .18s ease, border-color .18s ease; }
.char-card:hover { transform: translateY(-3px); border-color: rgba(195,165,255,.4); }
.orb { position: relative; display: flex; align-items: center; justify-content: center; width: 54px; height: 54px; margin-bottom: 12px; border-radius: 50%; font-family: var(--serif); font-size: 23px; color: #fff; background: radial-gradient(circle at 34% 30%, var(--a), var(--b) 72%); box-shadow: 0 0 30px -4px var(--a); }
.orb::after { content: ""; position: absolute; inset: 3px; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; }
.char-card > span { color: var(--lav); font-family: var(--mono); font-size: 8px; }
.char-card h3 { margin: 3px 0 3px; font-family: var(--serif); font-size: 22px; font-weight: 700; }
.char-card p { margin: 0 0 7px; color: var(--muted); font-size: 11px; line-height: 1.7; }
.char-card em { color: var(--dim); font-size: 8px; font-style: normal; }

/* features */
.feature-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; }
.feature-grid article { padding: 20px; border-top: 1px solid rgba(195,165,255,.35); background: rgba(255,255,255,.025); }
.feature-grid b { color: var(--rose); font-family: var(--mono); font-size: 10px; }
.feature-grid h3 { margin: 5px 0 4px; font-family: var(--serif); font-size: 22px; font-weight: 700; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 10.5px; line-height: 1.75; }

/* screens */
.rail-actions { display: flex; gap: 6px; flex: 0 0 auto; }
.rail-btn { width: 35px; height: 35px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink); font-size: 14px; }
.rail-btn:hover { background: var(--lav); border-color: var(--lav); color: var(--bg); }
.screen-rail { display: flex; gap: 13px; overflow-x: auto; scroll-snap-type: x mandatory; padding: 2px 1px 14px; scrollbar-width: thin; scrollbar-color: var(--lav) transparent; }
.screen-card { flex: 0 0 205px; margin: 0; scroll-snap-align: start; }
.screen { overflow: hidden; height: 410px; padding: 6px; border: 1px solid rgba(255,255,255,.17); border-radius: 24px; background: #0d0619; box-shadow: 0 18px 40px -22px #000; }
.screen img { width: 100%; height: 100%; object-fit: cover; object-position: top; border-radius: 18px; }
.screen-card figcaption { margin-top: 7px; color: var(--muted); font-size: 10px; }

/* scenes */
.scene-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.scene-card { padding: 24px; border: 1px solid var(--line); border-radius: 9px; background: radial-gradient(circle at 100% 0, rgba(195,165,255,.1), transparent 52%), rgba(255,255,255,.02); }
.scene-card > span { color: var(--rose); font-family: var(--mono); font-size: 9px; }
.scene-card h3 { margin: 11px 0 7px; font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--lav); }
.scene-card p { margin: 0 0 10px; color: var(--muted); font-size: 11px; line-height: 1.8; }
.scene-card em { color: var(--dim); font-size: 8px; font-style: normal; }

/* reviews */
.review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.review { padding: 17px; border: 1px solid var(--line); border-radius: 7px; background: rgba(255,255,255,.025); }
.review > div { color: var(--rose); font-size: 11px; letter-spacing: 2px; }
.review p { margin: 7px 0 9px; color: var(--muted); font-size: 11px; line-height: 1.8; }
.review span { color: var(--lav); font-family: var(--mono); font-size: 8px; }

/* download */
.down-grid { display: grid; grid-template-columns: .55fr 1.45fr; gap: 34px; align-items: start; margin-bottom: 30px; }
.down-phone { justify-self: center; text-align: center; }
.phone.small { width: 205px; padding: 7px; border-radius: 26px; }
.phone.small .screen { height: 370px; padding: 5px; border-radius: 20px; }
.phone.small .screen img { border-radius: 15px; }
.down-phone > small { display: inline-block; margin-top: 9px; color: var(--dim); font-family: var(--mono); font-size: 8px; }
.down-copy h3 { margin: 0 0 8px; font-family: var(--serif); font-size: 34px; font-weight: 700; }
.down-copy h3 em { color: var(--rose); font-style: normal; }
.down-copy > p:not(.kicker) { max-width: 590px; margin: 0 0 15px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.version-list { margin-bottom: 16px; border-top: 1px solid var(--line); }
.version-list div { display: flex; justify-content: space-between; gap: 14px; padding: 7px 0; border-bottom: 1px solid var(--line); font-size: 11px; }
.version-list span { color: var(--muted); font-family: var(--mono); font-size: 9px; }
.qr-inline { display: flex; align-items: center; gap: 12px; margin-top: 17px; padding-top: 14px; border-top: 1px solid var(--line); }
.qr-inline img { width: 88px; height: 88px; border-radius: 4px; background: #fff; padding: 4px; }
.qr-inline b { display: block; font-size: 12px; }
.qr-inline span { display: block; color: var(--muted); font-size: 9px; line-height: 1.6; }
.steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 10px; padding-top: 18px; border-top: 1px solid var(--line); }
.steps div { padding-right: 12px; border-right: 1px solid var(--line); }
.steps div:last-child { border-right: 0; }
.steps b { color: var(--rose); font-family: var(--mono); font-size: 9px; }
.steps h4 { margin: 3px 0 2px; font-family: var(--serif); font-size: 16px; }
.steps p { margin: 0; color: var(--muted); font-size: 9.5px; }

/* faq */
.faq-list { border-top: 1px solid rgba(195,165,255,.35); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 2px; cursor: pointer; list-style: none; font-size: 13.5px; font-weight: 600; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::marker { content: ""; }
.faq summary span { color: var(--rose); font-family: var(--mono); font-size: 15px; }
.faq details p { margin: 0; padding: 0 24px 15px 2px; color: var(--muted); font-size: 11px; line-height: 1.9; }

/* footer */
.footer { padding: 38px 0 18px; background: #04020a; color: var(--dim); }
.footer-top { display: grid; grid-template-columns: 1.4fr .7fr .7fr .8fr; gap: 26px; padding-bottom: 27px; border-bottom: 1px solid var(--line); }
.footer-brand a { display: inline-flex; align-items: center; gap: 9px; }
.footer-brand img { width: 36px; height: 36px; border-radius: 9px; }
.footer-brand b { color: var(--ink); font-family: var(--serif); font-size: 19px; }
.footer-brand p { margin: 9px 0 4px; color: var(--dim); font-size: 10px; }
.footer-brand small { color: #4c415a; font-size: 8px; }
.footer-col b { display: block; margin-bottom: 8px; color: var(--ink); font-size: 10px; }
.footer-col a { display: block; padding: 2px 0; color: var(--dim); font-size: 9.5px; }
.footer-col a:hover { color: var(--lav); }
.footer-col p { margin: 0 0 4px; color: var(--dim); font-size: 9.5px; }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding-top: 13px; color: #443b50; font-family: var(--mono); font-size: 8px; }

.mobile-download { display: none; }

/* PC readability */
@media (min-width: 1024px) {
  .hero-desc { font-size: 15px; }
  .hero-note { font-size: 10.5px; }
  .section-head p:not(.kicker) { font-size: 14px; }
  .why-card p { font-size: 12.5px; }
  .char-card p { font-size: 12px; }
  .feature-grid p { font-size: 11.5px; }
  .scene-card p { font-size: 12px; }
  .review p { font-size: 12px; }
  .faq summary { font-size: 14.5px; }
  .faq details p { font-size: 12px; }
  .steps p { font-size: 10.5px; }
}

/* responsive */
@media (max-width: 1023px) {
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-stage { justify-self: start; width: 330px; max-width: 100%; }
  .why-grid, .char-grid, .scene-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .down-grid { grid-template-columns: 1fr; }
  .down-phone { justify-self: start; }
  .screen-card { flex-basis: 190px; }
  .screen { height: 380px; }
}
@media (max-width: 820px) {
  .nav { display: none; }
  .menu-btn { display: inline-flex; margin-left: auto; }
  .header-cta { display: none; }
  .section { padding: 42px 0; }
  .section-head { display: block; }
  .rail-actions { margin-top: 10px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid div { padding: 15px 12px; }
  .stats-grid div:nth-child(3) { border-left: 0; padding-left: 0; }
  .review-grid { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .steps div:nth-child(2n) { border-right: 0; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .float-tag.t1 { right: -10px; }
  .float-tag.t2 { left: -10px; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .container { width: calc(100% - 28px); }
  .age-bar { font-size: 9px; }
  .header-inner { height: 60px; }
  .brand img { width: 32px; height: 32px; }
  .brand b { font-size: 17px; }
  .hero { padding: 36px 0 36px; }
  .hero h1 { font-size: 4.3rem; }
  .hero-sub { font-size: 22px; }
  .hero-sub br { display: block; }
  .hero-desc { font-size: 12.5px; }
  .hero-stage { width: 300px; }
  .float-tag { display: none; }
  .float-note { display: none; }
  .stats-grid b { font-size: 25px; }
  .feature-grid { grid-template-columns: 1fr; }
  .screen-card { flex-basis: 165px; }
  .screen { height: 330px; }
  .down-phone { justify-self: center; }
  .phone.small { width: 180px; }
  .phone.small .screen { height: 325px; }
  .steps { grid-template-columns: 1fr; }
  .steps div { border-right: 0; border-bottom: 1px solid var(--line); padding: 0 0 12px; }
  .steps div:last-child { border-bottom: 0; }
  .review-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 18px; }
  .footer-bottom { display: block; }
  .footer-bottom span { display: block; margin-top: 4px; }
  body { padding-bottom: 68px; }
  .mobile-download { display: flex; position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 120; align-items: center; justify-content: center; gap: 7px; padding: 13px 16px; border-radius: 999px; background: linear-gradient(135deg, var(--lav), var(--rose)); color: #160a26; font-size: 15px; font-weight: 900; box-shadow: 0 12px 30px -8px rgba(195,165,255,.4); }
  .mobile-download span { font-size: 8.5px; font-weight: 500; opacity: .7; }
}
@media (max-width: 390px) {
  .hero h1 { font-size: 3.8rem; }
  .screen-card { flex-basis: 150px; }
  .screen { height: 300px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

.faq summary { list-style: none; }
.faq summary::-webkit-details-marker { display: none !important; }
.faq summary::marker { content: "" !important; font-size: 0; color: transparent; }
.faq details > summary:first-of-type { list-style-type: none; }

.faq summary { display: grid; grid-template-columns: minmax(0,1fr) auto; align-items: center; list-style: none; }
.faq summary::before, .faq summary::marker { content: none !important; display: none !important; }


/* ==========================================================================
   PC 端字体基准：1024px 以上统一放大，移动端保持现有断点
   ========================================================================== */
@media (min-width: 1024px) {
  body { font-size: 19px; }
  .nav a { font-size: 15px; }
  .header-cta { font-size: 14px; padding: 10px 20px; }
  .eyebrow { font-size: 10.5px; }
  .hero-desc { font-size: 16.5px; line-height: 1.85; }
  .hero-note { font-size: 11.5px; }
  .btn { font-size: 14.5px; padding: 13px 23px; }
  .hero-sub { font-size: clamp(29px, 3vw, 38px); }

  .stats-grid b { font-size: 36px; }
  .stats-grid b em { font-size: 15px; }
  .stats-grid span { font-size: 11px; }

  .kicker { font-size: 10.5px; }
  .section-head h2 { font-size: clamp(38px, 3.7vw, 49px); }
  .section-head p:not(.kicker) { font-size: 15px; }
  .text-link { font-size: 12px; }

  .why-card > span { font-size: 10px; }
  .why-card h3 { font-size: 26px; }
  .why-card p { font-size: 14px; line-height: 1.8; }

  .char-card > span { font-size: 10px; }
  .char-card h3 { font-size: 24px; }
  .char-card p { font-size: 13.5px; }
  .char-card em { font-size: 10px; }

  .feature-grid b { font-size: 11px; }
  .feature-grid h3 { font-size: 24px; }
  .feature-grid p { font-size: 13px; line-height: 1.75; }

  .screen-card figcaption { font-size: 12px; }
  .scene-card > span { font-size: 10px; }
  .scene-card h3 { font-size: 24px; }
  .scene-card p { font-size: 13.5px; }
  .scene-card em { font-size: 10px; }

  .review > div { font-size: 13px; }
  .review p { font-size: 13.5px; }
  .review span { font-size: 10px; }

  .down-copy h3 { font-size: 38px; }
  .down-copy > p:not(.kicker) { font-size: 14px; }
  .version-list { font-size: 13px; }
  .version-list span { font-size: 11px; }
  .qr-inline b { font-size: 14px; }
  .qr-inline span { font-size: 11px; }
  .steps h4 { font-size: 18px; }
  .steps p { font-size: 12px; }

  .faq summary { font-size: 16px; padding: 17px 2px; }
  .faq details p { font-size: 13.5px; }

  .footer-brand p { font-size: 11.5px; }
  .footer-brand small { font-size: 10px; }
  .footer-col b { font-size: 12px; }
  .footer-col a, .footer-col p { font-size: 11.5px; }
  .footer-bottom { font-size: 9px; }

  .phone-top b { font-size: 14px; }
  .phone-top span { font-size: 9px; }
  .msg .bubble { font-size: 12px; }
  .typing { font-size: 8px; }
  .chat-input { font-size: 10px; }
  .float-tag { font-size: 9px; }
  .float-note { font-size: 8px; }
}


/* PC 端再提一档：以 20px 正文为基准 */
@media (min-width: 1024px) {
  body { font-size: 20px; }
  .nav a { font-size: 16px; }
  .header-cta { font-size: 15px; }
  .hero-desc { font-size: 18px; }
  .hero-note { font-size: 12px; }
  .btn { font-size: 15.5px; }
  .stats-grid b { font-size: 38px; }
  .stats-grid span { font-size: 12px; }
  .kicker { font-size: 11px; }
  .section-head p:not(.kicker) { font-size: 16px; }
  .why-card h3 { font-size: 28px; }
  .why-card p { font-size: 15.5px; }
  .char-card > span { font-size: 11px; }
  .char-card h3 { font-size: 26px; }
  .char-card p { font-size: 15px; }
  .char-card em { font-size: 11px; }
  .feature-grid h3 { font-size: 26px; }
  .feature-grid p { font-size: 14.5px; }
  .screen-card figcaption { font-size: 13px; }
  .scene-card h3 { font-size: 26px; }
  .scene-card p { font-size: 15px; }
  .review p { font-size: 15px; }
  .review span { font-size: 11px; }
  .down-copy > p:not(.kicker) { font-size: 15px; }
  .version-list { font-size: 14px; }
  .version-list span { font-size: 12px; }
  .qr-inline span { font-size: 12px; }
  .steps p { font-size: 13px; }
  .faq summary { font-size: 17px; }
  .faq details p { font-size: 15px; }
  .footer-brand p { font-size: 12.5px; }
  .footer-brand small { font-size: 11px; }
  .footer-col b { font-size: 13px; }
  .footer-col a, .footer-col p { font-size: 12.5px; }
  .msg .bubble { font-size: 13px; }
  .typing { font-size: 9px; }
  .chat-input { font-size: 11px; }
}


/* FAQ：一条问题一行，拉开间距 */
.faq-list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; border-top: 0; }
.faq-item { padding: 17px 20px; border: 1px solid var(--line); border-radius: 9px; background: rgba(255,255,255,.025); }
.faq-q { display: grid; grid-template-columns: 34px minmax(0,1fr); gap: 9px; align-items: start; }
.faq-q b { padding-top: 2px; color: var(--rose); font-family: var(--mono); font-size: 9px; }
.faq-q h3 { margin: 0; font-size: 16px; line-height: 1.55; font-weight: 600; }
.faq-item p { margin: 7px 0 0 43px; color: var(--muted); font-size: 13.5px; line-height: 1.9; }
@media (min-width: 1024px) {
  .faq-item { padding: 20px 22px; }
  .faq-q { grid-template-columns: 40px minmax(0,1fr); gap: 10px; }
  .faq-q b { font-size: 10px; }
  .faq-q h3 { font-size: 18px; }
  .faq-item p { margin-left: 50px; font-size: 15px; }
}
@media (max-width: 560px) {
  .faq-item { padding: 14px; }
  .faq-q { grid-template-columns: 28px minmax(0,1fr); }
  .faq-q h3 { font-size: 14px; }
  .faq-item p { margin-left: 0; font-size: 12.5px; }
}