:root{
  --bg:#ffffff;
  --bg-alt:#f5f5f7;
  --ink:#1d1d1f;
  --muted:#6e6e73;
  --line:#e3e3e6;
  --line-strong:#d2d2d7;
  --accent:#0071e3;
  --accent-ink:#0066cc;
  --radius:20px;
  --radius-lg:28px;
  --wrap:1080px;
  --nav-h:52px;
  --ease:cubic-bezier(.2,.7,.2,1);
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;background:#fff}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Inter","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Helvetica Neue",Arial,sans-serif;
  font-size:17px;
  line-height:1.5;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3{font-weight:600;letter-spacing:-.02em;margin:0}
p{margin:0}
a{color:var(--accent-ink);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 22px}
.wrap.narrow{max-width:720px}

.skip{
  position:absolute;left:-9999px;top:0;z-index:100;
  background:var(--ink);color:#fff;padding:10px 16px;border-radius:0 0 10px 0;
}
.skip:focus{left:0}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  height:var(--nav-h);
  background:rgba(255,255,255,.78);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(0,0,0,.07);
}
.nav-inner{
  max-width:var(--wrap);margin:0 auto;padding:0 22px;
  height:100%;display:flex;align-items:center;gap:28px;
}
.brand{display:flex;align-items:center;gap:8px;color:var(--ink);font-weight:600;letter-spacing:.02em}
.brand:hover{text-decoration:none}
.brand-mark{width:28px;height:28px;color:var(--ink);flex:none}
.brand-word{font-size:17px;letter-spacing:.06em;font-weight:600}
.nav-links{display:flex;gap:26px;margin-left:auto}
.nav-links a{
  color:rgba(29,29,31,.82);font-size:13px;letter-spacing:.01em;
}
.nav-links a:hover{color:var(--ink);text-decoration:none}
.lang-switch{
  font-size:12.5px;color:var(--muted);
  border:1px solid var(--line-strong);border-radius:980px;
  padding:4px 10px;letter-spacing:.02em;
}
.lang-switch:hover{color:var(--ink);text-decoration:none;border-color:var(--muted)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--accent);color:#fff;
  border:0;border-radius:980px;
  padding:12px 24px;font-size:17px;font-weight:500;letter-spacing:-.01em;
  font-family:inherit;cursor:pointer;
  transition:background .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.btn:hover{background:#0077ed;text-decoration:none;box-shadow:0 6px 18px rgba(0,113,227,.22)}
.btn:active{transform:translateY(1px)}
.btn-sm{padding:7px 15px;font-size:13px}
.link-arrow{font-size:17px;color:var(--accent-ink)}
.link-arrow span{margin-left:2px}

/* mobile menu toggle (hidden on desktop) */
.nav-toggle{
  display:none;flex-direction:column;align-items:center;justify-content:center;gap:5px;
  background:none;border:0;padding:8px 4px;cursor:pointer;
}
.nav-toggle-bar{
  display:block;width:18px;height:1.6px;border-radius:2px;background:var(--ink);
  transition:transform .25s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(3.3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-3.3px) rotate(-45deg)}

/* ---------- hero ---------- */
.hero{padding:clamp(64px,9vw,116px) 0 clamp(40px,6vw,72px);text-align:center}
.eyebrow{
  font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  color:var(--muted);margin-bottom:18px;
}
.hero h1{
  font-size:clamp(34px,4.3vw,60px);
  line-height:1.08;
  letter-spacing:-.028em;
  max-width:none;
  margin:0 auto;
}
.hero-sub{
  max-width:620px;margin:24px auto 0;
  font-size:clamp(18px,2vw,21px);
  line-height:1.5;
  color:var(--muted);
  letter-spacing:-.01em;
}
.hero-cta{
  display:flex;align-items:center;justify-content:center;gap:26px;
  flex-wrap:wrap;margin-top:34px;
}

/* ---------- product panel mock ---------- */
.panel{
  margin:clamp(48px,7vw,84px) auto 0;
  max-width:920px;
  background:var(--bg-alt);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  overflow:hidden;
  text-align:left;
  box-shadow:0 30px 60px -40px rgba(0,0,0,.28);
}
.panel-bar{
  display:flex;align-items:center;gap:7px;
  padding:13px 18px;
  background:rgba(255,255,255,.75);
  border-bottom:1px solid var(--line);
}
.dot{width:9px;height:9px;border-radius:50%;background:var(--line-strong);display:block}
.panel-title{margin-left:10px;font-size:12px;color:var(--muted);letter-spacing:.02em}
.panel-body{display:grid;grid-template-columns:190px 1fr;min-height:330px}
.panel-side{
  display:flex;flex-direction:column;gap:14px;
  padding:24px 18px;border-right:1px solid var(--line);
}
.side-line{display:block;height:9px;border-radius:6px;background:#e4e4e8}
.side-line.active{background:#c9dcf5}
.w50{width:50%}.w60{width:60%}.w70{width:70%}.w80{width:80%}.w90{width:90%}.w95{width:95%}
.panel-main{padding:24px 26px 26px}
.chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}
.chip{
  font-size:11.5px;color:var(--muted);
  background:#fff;border:1px solid var(--line);
  border-radius:980px;padding:5px 11px;letter-spacing:.01em;
}
.chip-on{background:#eef5fe;border-color:#cfe3fb;color:#0a5fbf}
.gen-line{height:10px;border-radius:6px;background:#e6e6ea;margin-bottom:12px}
.gen-card{
  background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:18px;margin-top:18px;
}
.gen-tag{display:block;font-size:11.5px;color:var(--muted);margin-bottom:14px;letter-spacing:.02em}
.gen-card .gen-line{margin-bottom:10px}
.gen-card .gen-line:last-child{margin-bottom:0}
.gen-foot{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  margin-top:20px;
}
.status{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted)}
.pulse{
  width:7px;height:7px;border-radius:50%;background:#34c759;
  box-shadow:0 0 0 4px rgba(52,199,89,.16);
}
.mini-btn{
  font-size:12.5px;color:#fff;background:var(--accent);
  border-radius:980px;padding:7px 16px;
}

/* ---------- strip ---------- */
.strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.strip-grid{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:20px;padding-top:38px;padding-bottom:38px;
  text-align:center;
}
.strip-item strong{
  display:block;font-size:clamp(26px,3.4vw,36px);font-weight:600;letter-spacing:-.02em;
}
.strip-item span{font-size:14px;color:var(--muted)}

/* ---------- sections ---------- */
section[id]{scroll-margin-top:calc(var(--nav-h) + 10px)}
.section{padding:clamp(64px,9vw,124px) 0}
.section.alt{background:var(--bg-alt)}
.section h2{
  font-size:clamp(30px,4.4vw,52px);
  line-height:1.08;
  letter-spacing:-.025em;
  max-width:24ch;
}
.section-sub{
  margin-top:18px;max-width:640px;
  font-size:clamp(17px,1.8vw,20px);
  color:var(--muted);
  letter-spacing:-.005em;
}

.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:clamp(32px,4vw,52px)}
.card{
  background:var(--bg-alt);
  border-radius:var(--radius);
  padding:32px 28px 34px;
}
.section.alt .card{background:#fff;border:1px solid var(--line)}
.card-icon{
  width:42px;height:42px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:#fff;border:1px solid var(--line);color:var(--accent);
  margin-bottom:22px;
}
.section.alt .card-icon{background:var(--bg-alt)}
.card-icon svg{width:22px;height:22px;fill:none}
.card h3{font-size:20px;letter-spacing:-.015em}
.card p{margin-top:10px;font-size:15.5px;line-height:1.55;color:var(--muted)}

.reasons{
  display:grid;grid-template-columns:repeat(3,1fr);gap:34px;
  margin-top:clamp(32px,4vw,52px);
}
.reason h3{font-size:19px;letter-spacing:-.015em}
.reason p{margin-top:10px;font-size:15.5px;line-height:1.55;color:var(--muted)}
.reason{border-top:1px solid var(--line-strong);padding-top:22px}

.steps{
  list-style:none;margin:clamp(32px,4vw,52px) 0 0;padding:0;
  display:grid;grid-template-columns:repeat(2,1fr);gap:18px;
}
.step{
  background:var(--bg-alt);border-radius:var(--radius);
  padding:30px 28px 32px;
}
.step-num{
  display:block;font-size:12.5px;font-weight:600;letter-spacing:.08em;
  color:var(--accent);margin-bottom:14px;
}
.step h3{font-size:19px}
.step p{margin-top:9px;font-size:15.5px;line-height:1.55;color:var(--muted)}
.section.alt .step{background:#fff;border:1px solid var(--line)}

.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:clamp(32px,4vw,52px)}
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px 32px}
.case h3{font-size:19px}
.case p{margin-top:10px;font-size:15.5px;line-height:1.55;color:var(--muted)}

/* ---------- platform chips ---------- */
.plat-grid{
  display:flex;flex-wrap:wrap;gap:10px;
  margin-top:clamp(26px,3.2vw,40px);
}
.plat{
  font-size:14px;letter-spacing:-.005em;
  background:#fff;border:1px solid var(--line-strong);
  border-radius:980px;padding:9px 16px;color:var(--ink);
}
.plat-store{background:#eef5fe;border-color:#cfe3fb;color:#0a5fbf;font-weight:500}
.honest{
  margin-top:clamp(26px,3.2vw,38px);
  font-size:15.5px;line-height:1.6;color:var(--muted);
  max-width:62ch;padding-left:16px;border-left:2px solid var(--line-strong);
}

/* ---------- limits ---------- */
.limits{
  display:grid;grid-template-columns:repeat(2,1fr);gap:18px;
  margin-top:clamp(32px,4vw,52px);
}
.limit{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 26px 30px;
}
.limit h3{font-size:18px;letter-spacing:-.015em}
.limit p{margin-top:9px;font-size:15.5px;line-height:1.55;color:var(--muted)}
.section:not(.alt) .limit{background:var(--bg-alt);border-color:transparent}

/* ---------- faq ---------- */
.faq{margin-top:clamp(28px,3.4vw,44px);border-top:1px solid var(--line-strong)}
.faq details{border-bottom:1px solid var(--line-strong)}
.faq summary{
  cursor:pointer;list-style:none;
  padding:22px 34px 22px 0;position:relative;
  font-size:18px;font-weight:500;letter-spacing:-.01em;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";position:absolute;right:6px;top:50%;
  width:9px;height:9px;margin-top:-6px;
  border-right:1.6px solid var(--muted);border-bottom:1.6px solid var(--muted);
  transform:rotate(45deg);transition:transform .25s var(--ease);
}
.faq details[open] summary::after{transform:rotate(-135deg)}
.faq details p{padding:0 0 24px;max-width:60ch;color:var(--muted);font-size:16px;line-height:1.6}

/* ---------- contact ---------- */
.contact{background:var(--bg-alt)}
.form{margin-top:clamp(28px,3.4vw,44px)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px;display:flex;flex-direction:column}
.field label{font-size:13.5px;color:var(--muted);margin-bottom:7px;letter-spacing:.01em}
.field .opt{color:#a1a1a6}
.field input,.field textarea{
  font-family:inherit;font-size:16px;color:var(--ink);
  background:#fff;border:1px solid var(--line-strong);border-radius:12px;
  padding:13px 15px;width:100%;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.field textarea{resize:vertical;min-height:112px;line-height:1.5}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--accent);
  box-shadow:0 0 0 4px rgba(0,113,227,.14);
}
.btn-submit{margin-top:6px;width:auto}
.form-note{margin-top:14px;font-size:13px;color:var(--muted);max-width:52ch}
.form-status{margin-top:12px;font-size:14px;min-height:1.2em}
.form-status.ok{color:#0a7d33}
.form-status.err{color:#b3261e}
.form-status.warn{color:#8a5a12}
.direct{margin-top:30px;font-size:15.5px;color:var(--muted)}

/* ---------- footer ---------- */
.footer{background:#fff;border-top:1px solid var(--line);padding:52px 0 34px}
.footer-inner{display:flex;justify-content:space-between;gap:28px;flex-wrap:wrap}
.footer-brand .brand-word{font-size:16px}
.footer-brand p{margin-top:8px;font-size:13.5px;color:var(--muted);max-width:34ch}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.footer-links a{font-size:13.5px;color:var(--muted)}
.footer-links a:hover{color:var(--ink)}
.footer-legal{margin-top:26px;padding-top:22px;border-top:1px solid var(--line)}
.footer-legal p{font-size:12.5px;color:#8e8e93}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  *{scroll-behavior:auto !important}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .cards,.reasons,.cases{grid-template-columns:1fr 1fr}
  .strip-grid{grid-template-columns:1fr 1fr 1fr;gap:12px}
  .panel-body{grid-template-columns:150px 1fr}
}
@media (max-width:720px){
  body{font-size:16px}
  .nav-toggle{display:flex;order:3;margin-left:12px}
  .nav-inner{gap:16px}
  .nav-inner > .btn-sm{order:2;margin-left:auto}
  .nav-links{
    display:none;position:absolute;left:0;right:0;top:var(--nav-h);
    flex-direction:column;gap:0;margin:0;padding:4px 22px 14px;
    background:#fff;
    -webkit-backdrop-filter:saturate(180%) blur(20px);
    backdrop-filter:saturate(180%) blur(20px);
    border-bottom:1px solid rgba(0,0,0,.07);
    box-shadow:0 12px 24px rgba(0,0,0,.06);
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 0;font-size:15px;border-top:1px solid var(--line)}
  .nav-links .lang-switch{align-self:flex-start;margin:14px 0 4px;border:1px solid var(--line-strong);padding:6px 14px;font-size:13px}
  .nav-links a:first-child{border-top:0}
  .hero{padding-top:52px;text-align:left}
  .hero h1,.hero-sub{margin-left:0}
  .hero-cta{justify-content:flex-start}
  .strip-grid{grid-template-columns:1fr;gap:24px;text-align:left}
  .cards,.reasons,.cases,.steps,.limits{grid-template-columns:1fr}
  .panel-body{grid-template-columns:1fr}
  .panel-side{display:none}
  .panel-main{padding:20px}
  .field-row{grid-template-columns:1fr}
  .footer-inner{flex-direction:column}
  .btn-submit{width:100%}
}

/* ---------- 中文排版（CJK 需要更松的行高、不能用负字距） ---------- */
html[lang="zh-CN"] body{line-height:1.75}
html[lang="zh-CN"] h1,html[lang="zh-CN"] h2,html[lang="zh-CN"] h3{letter-spacing:0}
html[lang="zh-CN"] .hero h1{line-height:1.3}
html[lang="zh-CN"] .section h2{line-height:1.32;max-width:20em}
html[lang="zh-CN"] .hero-sub,html[lang="zh-CN"] .section-sub{line-height:1.75}
html[lang="zh-CN"] .card h3,html[lang="zh-CN"] .reason h3,
html[lang="zh-CN"] .step h3,html[lang="zh-CN"] .limit h3,
html[lang="zh-CN"] .case h3{line-height:1.45}
html[lang="zh-CN"] .card p,html[lang="zh-CN"] .reason p,html[lang="zh-CN"] .step p,
html[lang="zh-CN"] .limit p,html[lang="zh-CN"] .case p,html[lang="zh-CN"] .honest{line-height:1.75}
html[lang="zh-CN"] .faq details p{line-height:1.8}
html[lang="zh-CN"] .faq summary{line-height:1.5}
html[lang="zh-CN"] .hero-sub{max-width:34em}

/* ---------- 一周示例 ---------- */
.week{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:clamp(48px,6vw,84px) 0}
.week-eyebrow{
  font-size:clamp(17px,2vw,21px);color:var(--ink);font-weight:500;
  letter-spacing:-.01em;margin-bottom:clamp(26px,3vw,38px);
}
.week-list{display:grid;gap:12px}
.week-row{
  display:grid;grid-template-columns:200px 1fr;gap:22px;
  background:var(--bg-alt);border-radius:16px;padding:18px 22px;
}
.week-when{display:flex;flex-direction:column;gap:4px}
.week-when strong{font-size:15px;letter-spacing:-.01em}
.week-when span{font-size:12.5px;color:var(--muted);letter-spacing:.01em}
.week-body h3{font-size:16.5px;letter-spacing:-.01em}
.week-body p{margin-top:6px;font-size:14.5px;line-height:1.6;color:var(--muted)}
.week-note{
  margin-top:clamp(22px,3vw,32px);font-size:15px;color:var(--muted);
  padding-left:16px;border-left:2px solid var(--line-strong);max-width:64ch;
}
.eg{
  margin-top:10px !important;padding-top:10px;border-top:1px dashed var(--line-strong);
  font-size:14px !important;line-height:1.7 !important;color:var(--ink) !important;
}
.eg-block{
  margin-top:clamp(24px,3vw,34px);font-size:15.5px;line-height:1.75;color:var(--ink);
  max-width:66ch;padding-left:16px;border-left:2px solid #cfe3fb;
}

@media (max-width:720px){
  .week-row{grid-template-columns:1fr;gap:8px;padding:16px 18px}
  .week-when{flex-direction:row;gap:10px;align-items:baseline}
  .week-when span{font-size:13px}
}

/* ---------- 下载按钮与版本信息 ---------- */
.btn-dl{padding:15px 32px;font-size:18px}
.dl-meta{
  margin-top:16px;font-size:13px;color:var(--muted);
  display:flex;flex-wrap:wrap;gap:8px 18px;justify-content:center;align-items:center;
}
.dl-meta span{position:relative}
.dl-meta span + span::before{
  content:"·";position:absolute;left:-11px;color:var(--line-strong);
}
.dl-win{margin-top:10px;font-size:13.5px;color:var(--muted)}
.dl-win strong{color:var(--ink);font-weight:500}
@media (max-width:720px){
  .btn-dl{width:100%;padding:14px 24px;font-size:17px}
  .dl-meta{gap:6px 16px;font-size:12.5px}
}

/* 中文手机端：标题里的人工换行在小屏会切词，改成自然折行 */
@media (max-width:720px){
  html[lang="zh-CN"] .hero h1 br{display:none}
  .dl-meta span + span::before{display:none}
}

/* ---------- 免费政策 / 示例引导句 / 中文小标不做大写 ---------- */
.dl-free{margin-top:10px;font-size:13.5px;color:var(--muted)}
.dl-free strong{color:var(--ink);font-weight:500}
.week-eyebrow{margin-bottom:12px}
.week-lead{
  margin:0 0 clamp(26px,3vw,38px);max-width:62ch;
  font-size:clamp(15px,1.7vw,17px);line-height:1.7;color:var(--muted);
}
html[lang="zh-CN"] .eyebrow{text-transform:none;letter-spacing:.02em}

/* ---------- 软件界面截图 ---------- */
.shot{
  margin:clamp(40px,6vw,72px) auto 0;max-width:1080px;
  background:#fff;border:1px solid var(--line);border-radius:20px;
  overflow:hidden;box-shadow:0 30px 60px -42px rgba(0,0,0,.3);
}
.shot img{display:block;width:100%;height:auto}
.shots{display:grid;gap:clamp(22px,3vw,34px);margin-top:clamp(32px,4vw,52px)}
.shots .shot{margin:0;max-width:none}
.shot figcaption{
  padding:16px 20px 18px;font-size:14.5px;line-height:1.65;color:var(--muted);
  border-top:1px solid var(--line);background:#fbfbfd;
}
.shot figcaption strong{color:var(--ink);font-weight:500}
@media (max-width:720px){
  .shot{border-radius:14px}
  .shot figcaption{font-size:13.5px;padding:14px 16px 16px}
}
.shot-link{display:block;cursor:zoom-in}
.shot-link:hover{opacity:.97}