:root{
  --bg:#F4F1E8; --card:#FBF8F0; --ink:#1D2A26; --muted:#6B746E;
  --brand:#2E6B5C; --brand2:#3E8A75; --accent:#C08A3E; --deep:#163029;
  --line:#E2DCCB; --line2:#D3CBb6; --white:#fff; --soft:#F0ECE0;
  --radius:14px; --shadow:0 10px 30px rgba(22,48,41,.08);
  --serif:"Georgia","Songti SC","STSong",serif; --sans:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand2)}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* ===== 顶栏/导航 ===== */
.topbar{position:sticky;top:0;z-index:50;background:rgba(244,241,232,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:28px;height:66px}
.logo{display:flex;align-items:center;gap:11px}
.logo img{width:36px;height:36px}
.logo-text{font-weight:700;font-size:21px;letter-spacing:.5px;color:var(--deep);line-height:1.05}
.logo-sub{font-size:11px;color:var(--muted);letter-spacing:1px;display:block}
.nav-links{display:flex;align-items:center;gap:26px;margin-left:auto}
.nav-links a{color:var(--ink);font-size:15px;position:relative;padding:4px 0}
.nav-links a.on{color:var(--brand);font-weight:600}
.nav-links a.on::after{content:"";position:absolute;left:0;right:0;bottom:-3px;height:2px;background:var(--brand);border-radius:2px}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;background:none;border:none;font-size:24px;color:var(--ink);cursor:pointer}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:10px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:.2s}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 6px 16px rgba(46,107,92,.28)}
.btn-primary:hover{transform:translateY(-1px);color:#fff;box-shadow:0 9px 22px rgba(46,107,92,.34)}
.btn-ghost{background:transparent;border-color:var(--brand);color:var(--brand)}
.btn-ghost:hover{background:var(--brand);color:#fff}
.btn-accent{background:linear-gradient(135deg,#C08A3E,#A9722C);color:#fff;box-shadow:0 6px 16px rgba(192,138,62,.3)}
.btn-accent:hover{transform:translateY(-1px);color:#fff}

/* ===== hero ===== */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(1200px 500px at 50% -160px,rgba(62,138,117,.16),transparent 70%),
  var(--bg)}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(22,48,41,.05) 1px,transparent 1px);background-size:22px 22px;mask-image:radial-gradient(70% 60% at 50% 0,#000 0%,transparent 75%)}
.hero-inner{position:relative;text-align:center;padding:66px 0 54px;display:flex;flex-direction:column;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:var(--deep);color:#D8C48A;font-size:13px;letter-spacing:1px;padding:7px 16px;border-radius:999px;margin-bottom:22px}
.hero-badge svg{width:15px;height:15px;flex:none}
.hero-title{font-size:clamp(30px,5vw,52px);line-height:1.14;font-weight:800;letter-spacing:.5px;color:var(--deep);max-width:760px}
.hero-title em{font-style:normal;color:var(--brand)}
.hero-lead{font-size:17px;color:var(--muted);max-width:660px;margin:18px auto 0}
.hero-actions{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap;justify-content:center}
.tick-strip{position:relative;height:18px;background:repeating-linear-gradient(90deg,var(--brand) 0 2px,transparent 2px 12px);opacity:.35;border-top:1px solid var(--line)}

/* ===== 区块通用 ===== */
.section{padding:64px 0}
.section-head{text-align:center;max-width:720px;margin:0 auto 40px}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:2px;color:var(--accent);font-weight:700;text-transform:uppercase;margin-bottom:10px}
.sec-title{font-size:clamp(24px,3.4vw,34px);font-weight:800;color:var(--deep)}
.sec-lead{color:var(--muted);margin-top:12px;font-size:16px}

/* ===== 下载参数表 ===== */
.param-table{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.param-table table{width:100%;border-collapse:collapse;font-size:15px}
.param-table th,.param-table td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line)}
.param-table th{background:var(--deep);color:#D8C48A;font-weight:600;letter-spacing:.5px}
.param-table tr:last-child td{border-bottom:none}
.param-table td:first-child{color:var(--muted);white-space:nowrap}
.param-table td b{color:var(--brand)}

/* ===== 硬数据区 ===== */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 20px;text-align:center;position:relative;overflow:hidden}
.stat::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--brand),var(--accent))}
.stat b{display:block;font-size:30px;color:var(--brand);font-weight:800}
.stat span{font-size:14px;color:var(--muted)}

/* ===== 优惠区 ===== */
.offer{background:linear-gradient(120deg,var(--deep),#1E4538);border-radius:var(--radius);padding:36px 40px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;color:#fff}
.offer h3{font-size:22px;color:#D8C48A}
.offer p{color:#c9d6d0;font-size:15px;margin-top:6px}

/* ===== 品牌区 ===== */
.brand{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center}
.brand .eyebrow{color:var(--accent)}

/* ===== bento 功能网格 ===== */
.grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.b-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:.2s}
.b-card:hover{border-color:var(--brand2);box-shadow:var(--shadow)}
.b-card svg{width:26px;height:26px;stroke:var(--brand);margin-bottom:12px}
.b-card h4{font-size:17px;color:var(--deep);margin-bottom:6px}
.b-card p{font-size:14px;color:var(--muted)}
.b1{grid-column:span 2;grid-row:span 2}
.b2{grid-column:span 2}
.b3{grid-column:span 2}
.b4{grid-column:span 2}
.b5{grid-column:span 2}
.b6{grid-column:span 3}
.b7{grid-column:span 3}

/* ===== 场景区 ===== */
.scene{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.scene-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.scene-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.scene-card .body{padding:22px}
.scene-card h3{font-size:20px;color:var(--deep);margin-bottom:10px}
.scene-card p{font-size:15px;color:var(--muted);margin-bottom:14px}
.scene-card .tag{display:inline-block;background:var(--soft);color:var(--brand);font-size:13px;padding:4px 12px;border-radius:999px;margin-right:8px;margin-bottom:8px}

/* ===== 文章feed ===== */
.feed{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.feed-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column}
.feed-card img{width:100%;aspect-ratio:16/9;object-fit:cover}
.feed-card .body{padding:18px;display:flex;flex-direction:column;flex:1}
.feed-card h4{font-size:16px;color:var(--deep);line-height:1.4;margin-bottom:8px}
.feed-card p{font-size:14px;color:var(--muted);flex:1}
.feed-card .more{margin-top:14px;font-size:14px;color:var(--accent);font-weight:600}

/* ===== 口碑区 ===== */
.voices{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.voice{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.voice p{font-size:15px;color:var(--ink);margin-bottom:14px}
.voice .who{font-size:13px;color:var(--muted)}
.voice .who b{color:var(--brand)}

/* ===== FAQ ===== */
.faq{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:18px 20px;font-size:16px;font-weight:600;color:var(--deep);cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:var(--sans)}
.faq-q::after{content:"+";font-size:22px;color:var(--accent);font-weight:400}
.faq-item.open .faq-q::after{content:"\2212"}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease}
.faq-item.open .faq-a{max-height:400px}
.faq-a p{padding:0 20px 18px;color:var(--muted);font-size:15px}

/* ===== 页脚 ===== */
.footer{background:var(--deep);color:#c9d6d0;margin-top:40px}
.footer .wrap{display:flex;flex-direction:column;align-items:center;gap:8px;padding:34px 24px}
.foot-line{color:#8aa39a;font-size:14px}

/* ===== 面包屑 ===== */
.crumb{font-size:13px;color:var(--muted);margin-bottom:6px}
.crumb a{color:var(--brand)}
.crumb span{color:var(--muted)}

/* ===== 文章 hero ===== */
.article-hero{background:radial-gradient(800px 380px at 50% -120px,rgba(62,138,117,.16),transparent 70%),var(--bg);padding:46px 0 30px;text-align:center}
.article-hero h1{font-size:clamp(26px,4vw,38px);font-weight:800;color:var(--deep);max-width:800px;margin:10px auto 0;line-height:1.3}
.article-hero p{color:var(--muted);max-width:720px;margin:14px auto 0;font-size:16px}

/* ===== 文章双栏 ===== */
.article-body{display:grid;grid-template-columns:250px 1fr;gap:40px;align-items:start;padding:40px 0}
.toc{position:sticky;top:90px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.toc h4{font-size:14px;letter-spacing:1px;color:var(--accent);margin-bottom:12px}
.toc a{display:block;font-size:14px;color:var(--muted);padding:5px 0;border-left:2px solid var(--line);padding-left:10px}
.toc a:hover{color:var(--brand);border-left-color:var(--brand)}
.prose{max-width:760px}
.prose h2{font-size:24px;color:var(--deep);margin:34px 0 14px;padding-bottom:8px;border-bottom:2px solid var(--line)}
.prose h3{font-size:18px;color:var(--brand);margin:24px 0 10px}
.prose p{margin-bottom:14px;color:#2c3631}
.prose ul,.prose ol{margin:0 0 14px 22px}
.prose li{margin-bottom:6px}
.prose img{border-radius:12px;margin:20px 0}
.prose figcaption{font-size:13px;color:var(--muted);text-align:center;margin:-12px 0 20px}
.table-wrap{overflow-x:auto;margin:18px 0}
.prose table{width:100%;border-collapse:collapse;font-size:14px;background:var(--card)}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--deep);color:#D8C48A}
.tip{background:var(--soft);border-left:3px solid var(--brand);padding:14px 18px;border-radius:8px;margin:18px 0;font-size:15px}
.callout{background:#FBF3E4;border-left:3px solid var(--accent);padding:14px 18px;border-radius:8px;margin:18px 0;font-size:15px}

/* ===== 相关卡片 ===== */
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:36px}
.related-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;font-size:14px}
.related-card b{color:var(--deep);display:block;margin-bottom:4px}

/* ===== 分享 ===== */
.share{display:flex;gap:10px;margin-top:20px;align-items:center}
.share span{font-size:14px;color:var(--muted)}
.share a{width:34px;height:34px;border-radius:50%;border:1px solid var(--line);display:flex;align-items:center;justify-content:center}
.share svg{width:16px;height:16px;stroke:var(--brand)}

/* ===== 左右图文 ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.split.rev{grid-template-columns:1fr 1fr}
.split.rev img{order:-1}
.split img{border-radius:var(--radius)}
.split h3{font-size:22px;color:var(--deep);margin-bottom:12px}
.split p{color:var(--muted);margin-bottom:10px}

/* ===== 步骤 ===== */
.steps{list-style:none;counter-reset:s;max-width:720px;margin:0 auto}
.steps li{position:relative;padding:0 0 26px 52px;counter-increment:s}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:50%;background:var(--deep);color:#D8C48A;display:flex;align-items:center;justify-content:center;font-weight:700}
.steps li::after{content:"";position:absolute;left:17px;top:36px;bottom:0;width:2px;background:var(--line)}
.steps li:last-child::after{display:none}
.steps h4{font-size:17px;color:var(--deep);margin-bottom:4px}
.steps p{color:var(--muted);font-size:15px}

/* ===== 下载平台卡 ===== */
.platforms{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.platform-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s}
.platform-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.platform-card .top{height:6px;background:linear-gradient(90deg,var(--brand),var(--accent))}
.platform-card .body{padding:20px}
.platform-card svg{width:26px;height:26px;stroke:var(--brand);margin-bottom:10px}
.platform-card h4{font-size:17px;color:var(--deep);margin-bottom:6px}
.platform-card p{font-size:14px;color:var(--muted)}

/* ===== 工具页 ===== */
.util-page{padding:70px 0;text-align:center}
.util-page h1{font-size:30px;color:var(--deep);margin-bottom:14px}
.util-page p{color:var(--muted)}

/* ===== 返回顶部 ===== */
.backtop{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;background:var(--brand);color:#fff;border:none;font-size:20px;cursor:pointer;opacity:0;pointer-events:none;transition:.25s;box-shadow:0 6px 16px rgba(46,107,92,.3)}
.backtop.show{opacity:1;pointer-events:auto}

/* ===== 响应式 ===== */
@media(max-width:920px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .grid{grid-template-columns:1fr 1fr}
  .b1,.b2,.b3,.b4,.b5,.b6,.b7{grid-column:span 2}
  .scene,.brand,.split,.split.rev{grid-template-columns:1fr}
  .split.rev img{order:0}
  .feed,.voices,.related{grid-template-columns:1fr}
  .platforms{grid-template-columns:1fr 1fr}
  .article-body{grid-template-columns:1fr}
  .toc{position:static;display:none}
  .nav-links{display:none;position:absolute;top:66px;left:0;right:0;background:var(--bg);flex-direction:column;padding:18px 24px;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block;margin-left:auto}
  .nav-cta{display:none}
}
@media(max-width:560px){.stats,.platforms{grid-template-columns:1fr}.hero-actions{flex-direction:column;width:100%}.hero-actions .btn{width:100%}}