/* aiyouxi-esg.com.cn — original stylesheet. Deep blue + cyan + white, small green/purple accents. */
:root{
  --navy-950:#060c1a;
  --navy-900:#0a1530;
  --navy-800:#0f1e40;
  --navy-700:#15295a;
  --blue-700:#123a86;
  --blue-600:#1857c9;
  --blue-500:#2f74ea;
  --cyan-500:#14b8d4;
  --cyan-400:#39d2ec;
  --cyan-100:#e3fbff;
  --green-500:#1fbf82;
  --green-100:#e3faf0;
  --purple-500:#7c5cff;
  --purple-100:#ede8ff;
  --ice-100:#eef4ff;
  --ice-200:#c9d9f5;
  --ink-900:#0a1428;
  --text-700:#28324a;
  --text-500:#54607c;
  --text-400:#7a86a3;
  --line:#e1e6f2;
  --bg:#f4f7fc;
  --card:#ffffff;
  --radius:12px;
  --radius-lg:18px;
  --shadow-card:0 4px 18px rgba(10,20,50,.07);
  --shadow-lg:0 18px 48px rgba(8,18,45,.16);
  --maxw:1200px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text-700);
  font-family:var(--font);line-height:1.75;font-size:15.5px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{color:var(--ink-900);line-height:1.32;font-weight:700;margin:0 0 14px;}
h1{font-size:34px;} h2{font-size:25px;margin-top:34px;} h3{font-size:18px;} h4{font-size:16px;}
p{margin:0 0 16px;}
a{color:var(--blue-600);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;display:block;}
ul{margin:0 0 16px;padding-left:22px;}
li{margin-bottom:6px;}
.skip-link{position:absolute;left:-999px;top:0;background:var(--blue-600);color:#fff;padding:10px 16px;z-index:999;}
.skip-link:focus{left:8px;top:8px;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.hide-mobile{display:inline-flex;}
.text-center{text-align:center;}
@media (max-width:640px){.hide-mobile{display:none;}}

/* topbar */
.topbar{background:var(--navy-950);color:var(--ice-200);font-size:12.5px;}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;padding-top:7px;padding-bottom:7px;gap:12px;flex-wrap:wrap;}
.topbar-tag{color:var(--cyan-400);font-weight:600;letter-spacing:.04em;}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50;}
.header-row{display:flex;align-items:center;gap:22px;padding:13px 20px;}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink-900);}
.brand span{display:flex;flex-direction:column;line-height:1.1;}
.brand small{font-size:10px;font-weight:600;color:var(--cyan-500);letter-spacing:.06em;}
.logo-mark{border-radius:7px;}
.main-nav{display:flex;gap:4px;flex:1;flex-wrap:wrap;}
.main-nav a{color:var(--text-500);font-weight:600;font-size:14.5px;padding:9px 12px;border-radius:8px;white-space:nowrap;}
.main-nav a:hover{background:var(--ice-100);color:var(--blue-600);text-decoration:none;}
.main-nav a[aria-current="page"]{color:var(--blue-600);background:var(--ice-100);}
.header-actions{display:flex;align-items:center;gap:10px;}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;width:38px;height:38px;position:relative;}
.nav-toggle span,.nav-toggle::before,.nav-toggle::after{content:"";display:block;position:absolute;left:9px;right:9px;height:2px;background:var(--ink-900);}
.nav-toggle::before{top:12px;} .nav-toggle span{top:18px;} .nav-toggle::after{top:24px;}
@media (max-width:1120px){
  .main-nav{position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:8px;border-bottom:1px solid var(--line);display:none;box-shadow:var(--shadow-card);}
  .main-nav.open{display:flex;}
  .header-row{position:relative;}
  .nav-toggle{display:block;}
}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:999px;font-weight:700;font-size:14.5px;cursor:pointer;border:1px solid transparent;}
.btn-primary{background:linear-gradient(135deg,var(--blue-600),var(--cyan-500));color:#fff;box-shadow:0 8px 22px rgba(24,87,201,.28);}
.btn-primary:hover{filter:brightness(1.06);text-decoration:none;}
.btn-ghost{background:#fff;border:1px solid var(--line);color:var(--text-700);}
.btn-ghost:hover{border-color:var(--blue-500);color:var(--blue-600);text-decoration:none;}
.btn-outline{background:transparent;border:1px solid var(--blue-500);color:var(--blue-600);}
.btn-outline:hover{background:var(--ice-100);text-decoration:none;}
.btn-lg{padding:13px 26px;font-size:15.5px;}

/* breadcrumb */
.breadcrumb{background:var(--ice-100);font-size:13.5px;color:var(--text-500);}
.breadcrumb .wrap{padding-top:11px;padding-bottom:11px;}
.breadcrumb a{color:var(--text-500);}
.breadcrumb .sep{margin:0 8px;color:var(--text-400);}
.breadcrumb .current{color:var(--ink-900);font-weight:600;}

/* hero */
.hero{background:radial-gradient(ellipse at 20% -10%,#173166 0%,var(--navy-900) 46%,var(--navy-950) 100%);color:#fff;padding:56px 0 0;overflow:hidden;position:relative;}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center;padding-bottom:40px;}
.eyebrow{display:inline-block;color:var(--cyan-400);font-weight:700;font-size:13px;letter-spacing:.05em;margin-bottom:14px;}
.hero h1{color:#fff;font-size:38px;}
.hero h1 em{font-style:normal;background:linear-gradient(120deg,var(--cyan-400),var(--purple-500));-webkit-background-clip:text;background-clip:text;color:transparent;}
.hero p.lead{font-size:17px;color:var(--ice-200);max-width:560px;}
.hero-actions{display:flex;gap:14px;margin-top:22px;flex-wrap:wrap;}
.hero-panel{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius-lg);padding:26px;backdrop-filter:blur(6px);}
.hero-panel .quote{font-size:17px;font-weight:700;color:#fff;margin-bottom:10px;}
.hero-flow{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.hero-flow span{background:rgba(20,184,212,.14);border:1px solid rgba(20,184,212,.3);color:var(--cyan-400);font-size:12.5px;font-weight:600;padding:6px 11px;border-radius:999px;}
.hero-strip{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid rgba(255,255,255,.14);padding:20px 0;gap:14px;}
.hero-strip div{display:flex;flex-direction:column;gap:3px;}
.hero-strip b{color:var(--cyan-400);font-size:13px;}
.hero-strip span{color:var(--ice-200);font-size:13.5px;}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr;} .hero-strip{grid-template-columns:repeat(2,1fr);}}

/* sections */
.section{padding:58px 0;}
.section-dark{background:linear-gradient(180deg,var(--navy-900),var(--navy-950));color:#fff;}
.section-dark h2,.section-dark h4{color:#fff;}
.section-dark p{color:var(--ice-200);}
.section-alt{background:var(--ice-100);}
.section-head{max-width:720px;margin:0 0 32px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-kicker{display:inline-block;color:var(--blue-600);font-weight:700;font-size:12.5px;letter-spacing:.06em;margin-bottom:8px;}
.section-dark .section-kicker{color:var(--cyan-400);}

/* grids / cards */
.grid{display:grid;gap:22px;}
.grid-2{grid-template-columns:1fr 1fr;}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-4{grid-template-columns:repeat(4,1fr);}
@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr);}}
@media (max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-card);}
.card h3{font-size:16.5px;margin-bottom:8px;}

.matrix-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.matrix-item{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius);padding:18px;}
.section:not(.section-dark) .matrix-item{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-card);}
.matrix-item h4{font-size:14.5px;margin:8px 0 6px;}
.matrix-item p{font-size:13.2px;color:var(--ice-200);margin:0;}
.section:not(.section-dark) .matrix-item p{color:var(--text-500);}
.matrix-item .ic{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--blue-600),var(--cyan-500));display:flex;align-items:center;justify-content:center;}
.matrix-item .ic svg{width:19px;height:19px;fill:none;stroke:#fff;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
@media (max-width:980px){.matrix-grid{grid-template-columns:repeat(3,1fr);}}
@media (max-width:680px){.matrix-grid{grid-template-columns:repeat(2,1fr);}}

/* feature rows */
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;padding:26px 0;border-bottom:1px solid var(--line);}
.feature-row:last-child{border-bottom:none;}
.feature-row.reverse{direction:rtl;}
.feature-row.reverse>*{direction:ltr;}
.feature-row h3{font-size:19px;}
.feature-row .fig{background:linear-gradient(135deg,var(--ice-100),#fff);border:1px solid var(--line);border-radius:var(--radius-lg);padding:20px;}
@media (max-width:820px){.feature-row,.feature-row.reverse{grid-template-columns:1fr;direction:ltr;}}

/* article cards */
.article-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-card);display:flex;flex-direction:column;}
.article-card .thumb{aspect-ratio:16/9;overflow:hidden;background:var(--ice-100);}
.article-card .thumb img{width:100%;height:100%;object-fit:cover;}
.article-card .body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1;}
.article-card h3{font-size:16.5px;margin:0;}
.article-card h3 a{color:var(--ink-900);}
.meta-row{display:flex;gap:10px;flex-wrap:wrap;font-size:12.5px;color:var(--text-400);}
.meta-row span:first-child{color:var(--blue-600);font-weight:700;}
.excerpt{font-size:13.8px;color:var(--text-500);margin:0;}
.tag-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:2px;}
.tag{background:var(--ice-100);color:var(--blue-600);font-size:11.8px;font-weight:600;padding:3px 9px;border-radius:999px;}
.read-more{font-weight:700;font-size:13.5px;color:var(--cyan-500);margin-top:auto;}

/* faq */
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{width:100%;text-align:left;background:none;border:none;padding:16px 0;font-size:15.5px;font-weight:700;color:var(--ink-900);cursor:pointer;display:flex;justify-content:space-between;align-items:center;}
.faq-q::after{content:"+";font-size:20px;color:var(--blue-600);font-weight:400;}
.faq-q[aria-expanded="true"]::after{content:"−";}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;}
.faq-a-inner{padding-bottom:16px;color:var(--text-500);font-size:14.3px;}

/* cta band */
.cta-band{background:linear-gradient(135deg,var(--blue-700),var(--navy-900) 60%,var(--purple-500));border-radius:var(--radius-lg);padding:44px;text-align:center;color:#fff;}
.cta-band h2{color:#fff;}
.cta-band p{color:var(--ice-200);max-width:560px;margin:0 auto 22px;}
.cta-actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;}

/* footer */
.site-footer{background:var(--navy-950);color:var(--ice-200);padding:48px 0 0;margin-top:20px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1fr;gap:26px;padding-bottom:32px;}
.footer-brand p{font-size:13.5px;color:var(--text-400);max-width:280px;}
.site-footer .brand{color:#fff;}
.footer-col h5{color:#fff;font-size:14px;margin-bottom:12px;}
.footer-col ul{list-style:none;padding:0;margin:0;}
.footer-col a{color:var(--ice-200);font-size:13.6px;}
.footer-col a:hover{color:var(--cyan-400);}
.footer-col li{margin-bottom:9px;}
@media (max-width:900px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.footer-grid{grid-template-columns:1fr;}}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:16px 0;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.8px;color:var(--text-400);}
.footer-bottom a{color:var(--text-400);}
.footer-bottom a:hover{color:var(--cyan-400);}
.icp-line{width:100%;text-align:center;padding-top:8px;border-top:1px solid rgba(255,255,255,.08);margin-top:8px;font-size:12.2px;color:var(--text-400);}

/* article layout */
.article-layout{display:grid;grid-template-columns:2.2fr 1fr;gap:40px;padding:34px 0 56px;align-items:start;}
@media (max-width:960px){.article-layout{grid-template-columns:1fr;}}
.article-head{margin-bottom:8px;}
.article-cat a{background:var(--ice-100);color:var(--blue-600);font-size:12.5px;font-weight:700;padding:4px 11px;border-radius:999px;}
.article-head h1{margin-top:12px;font-size:29px;}
.article-meta{display:flex;flex-wrap:wrap;gap:16px;align-items:center;font-size:13.3px;color:var(--text-400);padding-bottom:18px;margin-bottom:22px;border-bottom:1px solid var(--line);}
.article-meta .author{display:flex;align-items:center;gap:8px;font-weight:700;color:var(--text-700);}
.avatar{width:26px;height:26px;border-radius:50%;background:var(--ice-100);}
.article-body h2{font-size:21px;}
.article-body a{font-weight:600;}
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px;}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:18px;}
@media (max-width:760px){.related-grid{grid-template-columns:1fr;}}

/* sidebar */
.sidebar-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin-bottom:18px;box-shadow:var(--shadow-card);}
.sidebar-box h4{font-size:14.5px;margin-bottom:12px;}
.mini-card{display:flex;gap:10px;font-size:13.5px;padding:8px 0;border-bottom:1px solid var(--line);}
.mini-card:last-of-type{border-bottom:none;}
.mini-card .n{color:var(--cyan-500);font-weight:800;flex-shrink:0;}

/* forms / doc pages */
.form-card{max-width:440px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:34px;box-shadow:var(--shadow-card);}
.form-card label{display:block;font-size:13.5px;font-weight:700;margin-bottom:6px;color:var(--text-700);}
.form-card input,.form-card textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:9px;margin-bottom:16px;
  font-size:14.5px;font-family:var(--font);
}
.doc-page{max-width:820px;margin:0 auto;}
.search-box{display:flex;gap:10px;max-width:640px;margin:0 auto 30px;}
.search-box input{flex:1;padding:12px 15px;border:1px solid var(--line);border-radius:9px;font-size:14.5px;}
.search-result-list{max-width:760px;margin:0 auto;}
.search-result-item{padding:16px 0;border-bottom:1px solid var(--line);}
.search-result-item h3{font-size:16px;margin-bottom:4px;}
.search-result-item p{font-size:13.6px;color:var(--text-500);margin:0;}

/* back to top */
.back-to-top{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
  background:linear-gradient(135deg,var(--blue-600),var(--cyan-500));color:#fff;border:none;font-size:18px;cursor:pointer;
  box-shadow:var(--shadow-lg);opacity:0;pointer-events:none;transition:opacity .2s;z-index:60;}
.back-to-top.show{opacity:1;pointer-events:auto;}

/* accent chips reused across pages */
.chip-green{background:var(--green-100);color:var(--green-500);}
.chip-purple{background:var(--purple-100);color:var(--purple-500);}