:root{--moon:#edf2ef;--paper:#f7f5ec;--ink:#152a2e;--pine:#285044;--red:#9b352d;--gold:#9a8150;--line:#b8c2b8;--muted:#5c6d69;--nav-h:72px;--max:1180px}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",sans-serif;line-height:1.7}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;background-image:linear-gradient(90deg,transparent 49.8%,rgba(21,42,46,.025) 50%,transparent 50.2%);background-size:84px 100%}
img{max-width:100%}
a{color:inherit;text-decoration:none}
button,a{touch-action:manipulation}
:focus-visible{outline:3px solid #b4473d;outline-offset:4px}
.skip-link{position:fixed;left:16px;top:-100px;z-index:100;background:var(--ink);color:var(--moon);padding:10px 16px}
.skip-link:focus{top:12px}
.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}
.site-header{position:fixed;inset:0 0 auto;z-index:20;height:var(--nav-h);background:rgba(247,245,236,.94);border-bottom:1px solid rgba(21,42,46,.18);backdrop-filter:blur(12px)}
.nav-shell{max-width:var(--max);height:100%;margin:auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:inline-flex;align-items:center;gap:12px;font-family:STSong,SimSun,serif;font-size:19px;font-weight:700;white-space:nowrap}
.brand-seal{display:grid;place-items:center;width:34px;height:34px;color:var(--moon);background:var(--red);border:1px solid #79241e;box-shadow:inset 0 0 0 3px var(--red),inset 0 0 0 4px rgba(255,255,255,.38)}
.nav-links{display:flex;align-items:center;gap:28px;font-size:14px}
.nav-links a{position:relative;white-space:nowrap}
.nav-links a:not(.nav-cta)::after{content:"";position:absolute;left:50%;right:50%;bottom:-8px;height:2px;background:var(--red);transition:left .25s,right .25s}
.nav-links a:hover::after,.nav-links a.active::after{left:0;right:0}
.nav-cta,.button,.platform-download{display:inline-flex;align-items:center;justify-content:center;min-width:118px;white-space:nowrap;word-break:keep-all;writing-mode:horizontal-tb}
.nav-cta{min-height:40px;padding:0 18px;background:var(--red);color:#fff}
.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:transparent;padding:10px}
.menu-toggle span{display:block;height:2px;margin:5px 0;background:var(--ink)}
.section-shell{max-width:var(--max);margin:0 auto;padding:112px 24px}
.section-heading{max-width:700px;margin-bottom:48px}
.section-heading h2{margin:0 0 12px;font:700 clamp(30px,4vw,50px)/1.2 STSong,SimSun,serif;letter-spacing:.03em}
.section-heading p{margin:0;color:var(--muted)}
.hero{min-height:calc(100dvh - var(--nav-h));max-width:1280px;margin:var(--nav-h) auto 0;padding:54px 50px 58px;display:grid;grid-template-columns:.82fr 1.18fr;gap:64px;align-items:center}
.hero-copy{position:relative;padding-left:28px}
.hero-copy::before{content:"";position:absolute;left:0;top:0;bottom:0;width:8px;background:repeating-linear-gradient(to bottom,var(--red) 0 28px,transparent 28px 38px,var(--gold) 38px 42px,transparent 42px 52px)}
.title-slip{display:inline-block;margin:0 0 22px;padding:5px 13px;border:1px solid var(--gold);color:var(--pine);font:700 14px STSong,SimSun,serif;letter-spacing:.16em}
.hero h1{margin:0 0 22px;font:700 clamp(42px,5.5vw,76px)/1.12 STSong,SimSun,serif;letter-spacing:-.02em}
.hero-copy>p:not(.title-slip){max-width:470px;margin-bottom:28px;color:var(--muted);font-size:17px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.button{min-height:48px;padding:0 24px;border:1px solid var(--ink);font-weight:700;transition:transform .2s,background .2s,color .2s}
.button:hover{transform:translateY(-2px)}
.button:active{transform:translateY(1px)}
.button.primary{background:var(--red);border-color:var(--red);color:#fff}
.button.secondary{background:transparent;color:var(--ink)}
.button.secondary:hover{background:var(--ink);color:var(--moon)}
.lattice-frame{position:relative;background:linear-gradient(45deg,transparent 42%,rgba(40,80,68,.17) 42% 58%,transparent 58%) 0 0/32px 32px,linear-gradient(-45deg,transparent 42%,rgba(40,80,68,.17) 42% 58%,transparent 58%) 16px 0/32px 32px,var(--moon);border:14px solid var(--pine);outline:1px solid var(--gold);outline-offset:7px}
.hero-media::before,.download-hero-media::before{content:"";position:absolute;inset:-22px;z-index:-1;border:1px solid rgba(154,129,80,.5)}
.feature-section{padding-top:92px}
.feature-lattice{display:grid;grid-template-columns:1.15fr .85fr 1fr;grid-auto-rows:minmax(190px,auto);border:1px solid var(--line)}
.feature-item{display:flex;align-items:flex-end;gap:20px;padding:30px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--moon)}
.feature-item:nth-child(3n){border-right:0}
.feature-item.wide{grid-column:span 2}
.feature-item.dark{background:var(--ink);color:var(--moon)}
.feature-item.green{background:var(--pine);color:var(--moon)}
.feature-item.image-cell{padding:0;align-items:stretch;overflow:hidden}
.feature-item.image-cell img{width:100%;height:100%;object-fit:cover}
.feature-item h3{margin:0 0 6px;font:700 23px STSong,SimSun,serif}
.feature-item p{margin:0;max-width:340px;color:inherit;opacity:.78}
.glyph{flex:0 0 58px;height:58px;display:grid;place-items:center;border:1px solid currentColor;font:700 19px STSong,SimSun,serif}
.platform-section{background:var(--ink);color:var(--moon)}
.platform-layout{display:grid;grid-template-columns:.72fr 1.28fr;gap:70px;align-items:start}
.platform-intro{position:sticky;top:110px}
.platform-intro h2{margin:0 0 20px;font:700 clamp(35px,4vw,56px)/1.18 STSong,SimSun,serif}
.platform-intro p{color:#b9c7c3}
.platform-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid #62736f;border-left:1px solid #62736f}
.platform-grid article{min-height:260px;padding:30px;display:flex;flex-direction:column;align-items:flex-start;border-right:1px solid #62736f;border-bottom:1px solid #62736f}
.platform-grid strong{font:700 25px STSong,SimSun,serif}
.platform-grid span{margin:12px 0 auto;color:#b9c7c3}
.platform-download{min-height:46px;padding:0 18px;background:var(--moon);color:var(--ink);font-weight:700}
.scene-grid{display:grid;grid-template-columns:1.5fr .75fr;grid-template-rows:1fr 1fr;gap:18px}
.scene-main{grid-row:1/3;position:relative;min-height:560px;overflow:hidden;background:var(--pine)}
.scene-main img{width:100%;height:100%;object-fit:cover;display:block}
.scene-main div{position:absolute;left:0;bottom:0;width:min(420px,85%);padding:28px;background:rgba(21,42,46,.92);color:var(--moon)}
.scene-main h3,.scene-note h3{margin:0 0 8px;font:700 27px STSong,SimSun,serif}
.scene-main p,.scene-note p{margin:0}
.scene-note{padding:38px;display:flex;flex-direction:column;justify-content:flex-end;background:var(--moon);border:1px solid var(--line)}
.scene-note.red{background:var(--red);color:#fff;border:0}
.voices-section{background:#e1e8e3}
.voices{display:grid;grid-template-columns:1fr 1.15fr .9fr;align-items:start}
.voices blockquote{margin:0;padding:34px;border-left:1px solid #9aa99f;min-height:250px}
.voices blockquote:last-child{border-right:1px solid #9aa99f}
.voices p{margin:24px 0;font:600 18px/1.8 STSong,SimSun,serif}
.voices footer{display:flex;flex-direction:column;font-weight:700}
.voices small{font-weight:400;color:var(--muted)}
.avatar{display:grid;place-items:center;width:46px;height:46px;background:var(--red);color:#fff;font:700 20px STSong,SimSun,serif;border-radius:50%}
.green-avatar{background:var(--pine)}.gold-avatar{background:var(--gold)}
.plans{display:grid;grid-template-columns:1fr 1.08fr 1fr;align-items:center;gap:18px}
.plans article{position:relative;min-height:440px;padding:38px 32px;border:1px solid var(--line);display:flex;flex-direction:column}
.plans h3{margin:0;font:700 31px STSong,SimSun,serif}
.plans p{color:var(--muted)}
.plans ul{padding-left:20px;margin:22px 0 32px}
.plans li{margin:10px 0}
.plans .button{margin-top:auto}
.featured-plan{min-height:485px!important;background:var(--pine);color:var(--moon);border:0!important}
.featured-plan p{color:#d0dcd8}
.plan-ribbon{position:absolute;right:22px;top:0;padding:7px 12px;background:var(--gold);color:#fff;font-size:13px}
.featured-plan .button.primary{background:var(--moon);color:var(--ink);border-color:var(--moon)}
.faq-list{border-top:2px solid var(--ink)}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{cursor:pointer;padding:22px 50px 22px 4px;font:700 19px STSong,SimSun,serif;list-style:none;position:relative}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"＋";position:absolute;right:8px;font:400 24px sans-serif}
.faq-list details[open] summary::after{content:"－"}
.faq-list p{padding:0 50px 22px 4px;margin:0;color:var(--muted)}
.text-link{display:inline-block;margin-top:30px;color:var(--red);border-bottom:1px solid currentColor}
.site-footer{background:#102327;color:#d9e2de;padding:72px 24px 24px}
.footer-grid{max-width:var(--max);margin:auto;display:grid;grid-template-columns:1.8fr repeat(3,1fr);gap:54px}
.footer-grid>div{display:flex;flex-direction:column;align-items:flex-start;gap:9px}
.footer-grid h2{margin:0 0 8px;font:700 17px STSong,SimSun,serif;color:#fff}
.footer-grid a:not(.brand){color:#b8c7c3;font-size:14px}
.footer-grid p{color:#9fb1ac}
.copyright{max-width:var(--max);margin:55px auto 0;padding-top:22px;border-top:1px solid #385057;color:#829993;font-size:13px}

/* 下载页 */
.sub-hero{max-width:var(--max);min-height:720px;margin:var(--nav-h) auto 0;padding:68px 24px 80px;display:grid;grid-template-columns:.7fr 1.3fr;gap:70px;align-items:center}
.sub-title{align-self:center;padding:34px 0;border-top:5px solid var(--red);border-bottom:1px solid var(--gold)}
.chapter-mark{display:inline-block;margin-bottom:24px;color:var(--red);font-weight:700;letter-spacing:.2em}
.sub-title h1,.help-title h1{margin:0 0 22px;font:700 clamp(42px,5.3vw,70px)/1.14 STSong,SimSun,serif}
.sub-title p,.help-title p{color:var(--muted);font-size:17px}
.download-hero-media{position:relative;align-self:center}
.download-hero-media img{display:block;width:100%;height:auto}
.download-matrix{padding-top:78px}
.download-cards{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line)}
.download-card{min-height:350px;padding:34px;display:grid;grid-template-columns:64px 1fr;grid-template-rows:1fr auto;gap:24px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--moon)}
.download-card:nth-child(even){border-right:0}.download-card:nth-child(n+3){border-bottom:0}
.download-card.primary-card{background:var(--pine);color:var(--moon)}
.download-card h3{margin:0;font:700 29px STSong,SimSun,serif}
.download-card p{margin:8px 0 18px;color:inherit;opacity:.75}
.download-card dl{margin:0}.download-card dl div{display:grid;grid-template-columns:90px 1fr;padding:7px 0;border-top:1px solid currentColor}
.download-card dt{opacity:.62}.download-card dd{margin:0}
.platform-symbol{width:58px;height:58px;display:grid;place-items:center;border:1px solid currentColor;font:700 20px STSong,SimSun,serif}
.download-card .platform-download{grid-column:2;background:var(--red);color:#fff;justify-self:start}
.before-install{background:#dfe7e2}
.install-layout{display:grid;grid-template-columns:1.05fr .95fr;gap:70px;align-items:center}
.install-image{position:relative;padding:0 0 28px 28px}
.install-image::before{content:"";position:absolute;inset:28px 28px 0 0;border:1px solid var(--pine);background:repeating-linear-gradient(45deg,rgba(40,80,68,.12) 0 2px,transparent 2px 14px);z-index:0}
.install-image img{position:relative;display:block}
.install-content h2,.continuity h2,.download-notice h2{font:700 42px STSong,SimSun,serif;margin:0 0 25px}
.install-content ol{padding:0;margin:0;list-style:none}
.install-content li{display:grid;grid-template-columns:100px 1fr;gap:20px;padding:18px 0;border-bottom:1px solid #9baaa1}
.install-content span{color:var(--muted)}
.continuity-title{max-width:620px;margin-bottom:50px}
.continuity-path{display:grid;grid-template-columns:1fr 70px 1fr 70px 1fr;align-items:center}
.continuity-path article{min-height:220px;padding:30px;border:1px solid var(--line)}
.continuity-path article span{color:var(--red);font-weight:700}
.continuity-path h3{font:700 23px STSong,SimSun,serif}
.continuity-path i{height:1px;background:var(--gold);position:relative}
.continuity-path i::after{content:"";position:absolute;right:0;top:-4px;width:8px;height:8px;border-top:1px solid var(--gold);border-right:1px solid var(--gold);transform:rotate(45deg)}
.download-notice{padding-top:52px;padding-bottom:52px;display:flex;align-items:center;justify-content:space-between;gap:40px;border-top:1px solid var(--line)}
.download-notice h2{font-size:29px;margin-bottom:8px}.download-notice p{margin:0;max-width:720px;color:var(--muted)}

/* 帮助页 */
.help-mast{margin-top:var(--nav-h);background:var(--moon);border-bottom:1px solid var(--line)}
.help-mast-inner{max-width:var(--max);min-height:610px;margin:auto;padding:74px 24px;display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}
.help-title{padding:40px 45px 40px 0;border-right:1px solid var(--gold)}
.help-index{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.help-index a{min-height:150px;padding:26px;display:flex;flex-direction:column;justify-content:flex-end;border-right:1px solid var(--line);border-bottom:1px solid var(--line);font:700 21px STSong,SimSun,serif;transition:background .2s,color .2s}
.help-index a:hover{background:var(--pine);color:var(--moon)}
.help-index span{margin-bottom:auto;color:var(--red);font:700 13px "Microsoft YaHei",sans-serif}
.help-content{display:grid;grid-template-columns:220px 1fr;gap:82px;align-items:start}
.help-aside{position:sticky;top:105px;display:flex;flex-direction:column;border-left:4px solid var(--red);padding-left:22px}
.help-aside strong{margin-bottom:15px;font:700 21px STSong,SimSun,serif}
.help-aside a{padding:7px 0;color:var(--muted)}
.help-aside a:hover{color:var(--red)}
.help-articles>section{padding-bottom:58px;margin-bottom:58px;border-bottom:1px solid var(--line)}
.help-articles h2{margin:0 0 20px;font:700 36px STSong,SimSun,serif}
.help-articles details{background:var(--moon);margin-bottom:12px;border-left:3px solid transparent}
.help-articles details[open]{border-left-color:var(--pine)}
.help-articles summary{list-style:none;cursor:pointer;padding:20px 56px 20px 22px;font-weight:700;position:relative}
.help-articles summary::-webkit-details-marker{display:none}
.help-articles summary::after{content:"＋";position:absolute;right:22px;color:var(--red)}
.help-articles details[open] summary::after{content:"－"}
.help-articles details p{margin:0;padding:0 22px 22px;color:var(--muted)}
.help-articles details a{color:var(--red);text-decoration:underline}
.help-guide{background:var(--pine);color:var(--moon)}
.guide-layout{display:grid;grid-template-columns:.65fr 1.35fr;gap:70px}
.guide-layout h2{font:700 40px STSong,SimSun,serif;margin:0 0 12px}
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);border-left:1px solid #7b958b}
.guide-grid article{padding:28px;border-right:1px solid #7b958b}
.guide-grid strong{font:700 25px STSong,SimSun,serif;color:#e1c987}
.guide-grid p{color:#cbd8d3}
.about-contact{display:grid;grid-template-columns:1.2fr .9fr .9fr;gap:50px}
.about-contact>div{padding-top:24px;border-top:3px solid var(--ink)}
.about-contact h2{font:700 26px STSong,SimSun,serif;margin:0 0 15px}
.about-contact p{color:var(--muted)}

.reveal{animation:arrive .75s cubic-bezier(.16,1,.3,1) both}
.hero-media,.download-hero-media{animation-delay:.12s}
@keyframes arrive{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

@media(max-width:980px){
  .nav-links{gap:17px}.nav-links a:not(.nav-cta){font-size:13px}
  .hero,.sub-hero{grid-template-columns:1fr 1fr;gap:35px;padding-left:24px;padding-right:24px}
  .feature-lattice{grid-template-columns:1fr 1fr}.feature-item:nth-child(3n){border-right:1px solid var(--line)}.feature-item:nth-child(even){border-right:0}
  .platform-layout,.install-layout{gap:40px}
  .footer-grid{grid-template-columns:1.4fr repeat(3,1fr);gap:25px}
}
@media(max-width:760px){
  :root{--nav-h:64px}
  .menu-toggle{display:block}
  .nav-links{display:none;position:absolute;left:0;right:0;top:var(--nav-h);padding:18px 24px 24px;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0}.nav-links .nav-cta{margin-top:8px}
  .section-shell{padding:76px 18px}
  .hero{min-height:auto;grid-template-columns:1fr;gap:44px;padding:48px 18px 70px}
  .hero h1{font-size:clamp(38px,12vw,56px)}
  .hero-copy{padding-left:20px}
  .feature-lattice{grid-template-columns:1fr}
  .feature-item,.feature-item.wide{grid-column:auto;border-right:0!important}
  .feature-item.image-cell{min-height:260px}
  .platform-layout,.install-layout,.help-mast-inner,.guide-layout{grid-template-columns:1fr}
  .platform-intro{position:static}
  .platform-grid{grid-template-columns:1fr}
  .platform-grid article{min-height:220px}
  .scene-grid{grid-template-columns:1fr;grid-template-rows:auto}.scene-main{grid-row:auto;min-height:430px}
  .voices,.plans{grid-template-columns:1fr}.voices blockquote,.voices blockquote:last-child{border:0;border-top:1px solid #9aa99f;min-height:auto}
  .plans article,.featured-plan{min-height:auto!important}.plans .button{margin-top:20px}
  .footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/3}
  .sub-hero{min-height:auto;grid-template-columns:1fr;padding:52px 18px 76px}
  .download-cards{grid-template-columns:1fr}.download-card{border-right:0;border-bottom:1px solid var(--line)!important}
  .download-card:last-child{border-bottom:0!important}
  .continuity-path{grid-template-columns:1fr}.continuity-path i{height:45px;width:1px;justify-self:center}.continuity-path i::after{right:-4px;top:auto;bottom:0;transform:rotate(135deg)}
  .download-notice{align-items:flex-start;flex-direction:column}
  .help-mast-inner{min-height:auto;gap:35px}.help-title{border-right:0;border-bottom:1px solid var(--gold);padding-right:0}
  .help-content{grid-template-columns:1fr;gap:38px}.help-aside{position:static;display:grid;grid-template-columns:1fr 1fr}
  .help-aside strong{grid-column:1/3}
  .guide-grid,.about-contact{grid-template-columns:1fr}.guide-grid{border-left:0;border-top:1px solid #7b958b}.guide-grid article{border-right:0;border-bottom:1px solid #7b958b}
}
@media(max-width:480px){
  .hero-actions{display:grid}.button{width:100%}
  .platform-grid{grid-template-columns:1fr}
  .download-card{grid-template-columns:1fr}.download-card .platform-download{grid-column:1;width:100%}
  .help-index{grid-template-columns:1fr}.help-index a{min-height:110px}
  .footer-grid{grid-template-columns:1fr}.footer-grid>div:first-child{grid-column:auto}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}

/* Hero 最终覆盖：主图保持自然比例，窗棂仅作外层边界 */
.hero{align-items:center!important}
.hero .hero-media{align-self:center!important;height:auto!important;padding:0!important;margin-top:0!important;margin-bottom:0!important;overflow:visible!important;clip-path:none!important;transform:none!important}
.hero .hero-media .hero-image{display:block!important;width:100%!important;height:auto!important;object-fit:contain!important;object-position:center!important;min-height:0!important;max-height:none!important;margin:0!important;padding:0!important;clip-path:none!important;transform:none!important}