/* ==========================================================================
   kaiyun.com 开云 — 全站样式表（原创）
   ========================================================================== */

:root{
  --navy-950:#060b16;
  --navy-900:#0a1224;
  --navy-800:#101c34;
  --navy-700:#16274a;
  --blue-600:#2f6fed;
  --blue-500:#4c8bff;
  --cyan-400:#22d3ee;
  --cyan-300:#67e8f9;
  --ice-50:#f4f8fd;
  --ice-100:#e9f1fb;
  --ice-200:#d9e7f7;
  --white:#ffffff;
  --text-900:#101826;
  --text-700:#33425c;
  --text-500:#5b6b85;
  --text-400:#7c8aa3;
  --line:#e1e8f4;
  --line-soft:#edf2fa;
  --success:#1fae74;
  --warn:#e8912b;
  --green-600:#16a34a;
  --green-500:#22c55e;
  --teal-500:#0d9488;
  --teal-100:#e3f5f1;
  --radius-lg:18px;
  --radius-md:12px;
  --radius-sm:8px;
  --shadow-card:0 4px 24px rgba(16,28,52,.06);
  --shadow-pop:0 12px 40px rgba(16,28,52,.14);
  --maxw:1240px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  color:var(--text-700);
  background:var(--white);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--blue-600);text-decoration:none;}
a:hover{text-decoration:underline;}
h1,h2,h3,h4{color:var(--text-900);line-height:1.35;margin:0 0 .6em;font-weight:700;}
p{margin:0 0 1em;}
ul,ol{margin:0 0 1em;padding-left:1.4em;}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.skip-link{position:absolute;left:-999px;top:0;background:var(--blue-600);color:#fff;padding:10px 16px;z-index:999;border-radius:0 0 8px 0;}
.skip-link:focus{left:0;}

/* ---------- Top utility bar ---------- */
.topbar{background:var(--navy-950);color:var(--ice-200);font-size:13px;}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;min-height:36px;gap:12px;flex-wrap:nowrap;overflow:hidden;white-space:nowrap;}
.topbar span{opacity:.85;overflow:hidden;text-overflow:ellipsis;}
.topbar .topbar-tag{color:var(--cyan-300);letter-spacing:.04em;font-weight:600;flex:none;}
@media (max-width:640px){
  .topbar .wrap>span:not(.topbar-tag){display:none;}
}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--navy-900);
  border-bottom:1px solid rgba(255,255,255,.06);
}
.header-row{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px;}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px;flex:0 0 auto;}
.brand:hover{text-decoration:none;}
.brand .logo-mark{width:32px;height:32px;flex:none;}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--cyan-300);letter-spacing:.06em;}

.main-nav{display:flex;align-items:center;gap:0;flex:1 1 auto;justify-content:center;min-width:0;}
.main-nav a{
  color:var(--ice-100);
  font-size:13.5px;
  font-weight:500;
  padding:8px 8px;
  border-radius:8px;
  white-space:nowrap;
}
.main-nav a:hover,.main-nav a:focus-visible{background:rgba(255,255,255,.08);text-decoration:none;}
.main-nav a[aria-current="page"]{color:#fff;background:rgba(79,141,255,.22);}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  padding:9px 18px;border-radius:999px;font-size:14px;font-weight:600;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
}
.btn:hover{text-decoration:none;}
.btn-primary{background:linear-gradient(135deg,var(--blue-600),var(--cyan-400));color:#fff;}
.btn-primary:hover{filter:brightness(1.06);}
.btn-ghost{background:transparent;color:var(--ice-100);border-color:rgba(255,255,255,.28);}
.btn-ghost:hover{background:rgba(255,255,255,.08);}
.btn-outline{background:transparent;color:var(--blue-600);border-color:var(--blue-600);}
.btn-outline:hover{background:var(--ice-50);}
.btn-block{width:100%;}
.btn-lg{padding:13px 26px;font-size:15.5px;}

.nav-toggle{
  display:none;background:transparent;border:1px solid rgba(255,255,255,.3);
  border-radius:8px;width:40px;height:40px;flex:none;cursor:pointer;position:relative;
}
.nav-toggle span,.nav-toggle::before,.nav-toggle::after{
  content:"";position:absolute;left:9px;right:9px;height:2px;background:#fff;border-radius:2px;
}
.nav-toggle span{top:19px;}
.nav-toggle::before{top:13px;}
.nav-toggle::after{top:25px;}

.mobile-panel{display:none;}

@media (max-width:1120px){
  .main-nav{
    position:absolute;left:0;right:0;top:64px;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--navy-900);
    border-top:1px solid rgba(255,255,255,.08);
    max-height:0;overflow:hidden;
    transition:max-height .25s ease;
  }
  .site-header.is-open .main-nav{max-height:520px;}
  .main-nav a{padding:14px 20px;border-radius:0;border-bottom:1px solid rgba(255,255,255,.06);}
  .hide-mobile{display:none;}
  .nav-toggle{display:block;}
}

/* ---------- Breadcrumb ---------- */
.breadcrumb{font-size:13.5px;color:var(--text-500);padding:16px 0;}
.breadcrumb a{color:var(--text-500);}
.breadcrumb a:hover{color:var(--blue-600);}
.breadcrumb .sep{margin:0 6px;color:var(--text-400);}
.breadcrumb .current{color:var(--text-700);}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(1100px 520px at 82% -10%,rgba(34,211,238,.18),transparent 60%),
    radial-gradient(900px 500px at -10% 10%,rgba(47,111,237,.28),transparent 55%),
    linear-gradient(160deg,var(--navy-950),var(--navy-900) 60%,var(--navy-800));
  color:var(--ice-100);
  padding:56px 0 64px;
}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--cyan-300);margin-bottom:14px;
}
.hero h1{color:#fff;font-size:clamp(28px,4vw,44px);margin-bottom:18px;}
.hero h1 em{font-style:normal;color:var(--cyan-300);}
.hero p.lead{font-size:17px;color:var(--ice-200);max-width:560px;}
.hero-actions{display:flex;gap:12px;margin-top:26px;flex-wrap:wrap;}
.hero-panel{
  background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius-lg);
  padding:26px;
  backdrop-filter:none;
}
.hero-panel .quote{font-size:16px;color:#fff;font-weight:600;margin-bottom:10px;}
.hero-flow{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;}
.hero-flow span{
  font-size:12.5px;padding:6px 10px;border-radius:999px;
  background:rgba(255,255,255,.08);color:var(--ice-100);border:1px solid rgba(255,255,255,.14);
}
.hero-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:36px;}
.hero-strip div{
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-md);padding:14px 16px;
}
.hero-strip b{display:block;color:var(--cyan-300);font-size:12.5px;margin-bottom:4px;}
.hero-strip span{color:var(--ice-100);font-size:13.5px;}

@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;}
  .hero-strip{grid-template-columns:repeat(2,1fr);}
}

/* ---------- Section scaffolding ---------- */
.section{padding:60px 0;}
.section-tight{padding:40px 0;}
.section-alt{background:var(--ice-50);}
.section-dark{background:var(--navy-900);color:var(--ice-100);}
.section-dark h2,.section-dark h3{color:#fff;}
.section-head{max-width:720px;margin:0 0 32px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.section-head h2{font-size:clamp(22px,3vw,30px);}
.section-head p{color:var(--text-500);font-size:15.5px;}
.section-kicker{font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue-600);margin-bottom:10px;display:block;}
.section-dark .section-kicker{color:var(--cyan-300);}

/* ---------- Grids & Cards ---------- */
.grid{display:grid;gap:20px;}
.grid-2{grid-template-columns:repeat(2,1fr);}
.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:#fff;border:1px solid var(--line);border-radius:var(--radius-md);
  padding:22px;box-shadow:var(--shadow-card);
}
.card h3{font-size:17px;}
.tech-card{padding:20px 20px 18px;}
.tech-card .ic{
  width:42px;height:42px;border-radius:11px;
  background:linear-gradient(135deg,var(--blue-600),var(--cyan-400));
  display:flex;align-items:center;justify-content:center;margin-bottom:12px;
}
.tech-card .ic svg{width:22px;height:22px;stroke:#fff;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.tech-card h3{font-size:15.5px;margin-bottom:6px;}
.tech-card p{font-size:13.8px;color:var(--text-500);margin:0;}

/* ---------- Article cards ---------- */
.article-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);
  overflow:hidden;box-shadow:var(--shadow-card);display:flex;flex-direction:column;height:100%;
}
.article-card .thumb{aspect-ratio:16/9;background:var(--ice-100);overflow:hidden;}
.article-card .thumb img{width:100%;height:100%;object-fit:cover;}
.article-card .body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1;}
.article-card .meta-row{font-size:12.5px;color:var(--text-400);display:flex;gap:10px;flex-wrap:wrap;margin-bottom:8px;}
.article-card h3{font-size:16.5px;margin-bottom:8px;}
.article-card h3 a{color:var(--text-900);}
.article-card h3 a:hover{color:var(--blue-600);text-decoration:none;}
.article-card p.excerpt{font-size:13.8px;color:var(--text-500);flex:1;}
.tag-row{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0;}
.tag{
  font-size:12px;color:var(--blue-600);background:var(--ice-100);
  padding:3px 9px;border-radius:999px;font-weight:600;
}
.tag-esg{color:var(--teal-500);background:var(--teal-100);}
.esg-badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;color:var(--teal-500);}
.esg-badge::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--green-500);}
.esg-score-row{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0;}
.esg-score-item{flex:1;min-width:140px;background:var(--ice-50);border:1px solid var(--line);border-radius:var(--radius-md);padding:14px 16px;}
.esg-score-item b{display:block;font-size:22px;color:var(--text-900);}
.esg-score-item span{font-size:12.5px;color:var(--text-500);}
.read-more{font-size:13.5px;font-weight:700;color:var(--blue-600);display:inline-flex;align-items:center;gap:4px;margin-top:auto;}
.read-more:hover{text-decoration:none;gap:8px;transition:gap .15s;}

.article-card.featured{flex-direction:row;align-items:stretch;}
.article-card.featured .thumb{width:42%;aspect-ratio:auto;flex:none;}
.article-card.featured .body{width:58%;}
@media (max-width:760px){
  .article-card.featured{flex-direction:column;}
  .article-card.featured .thumb,.article-card.featured .body{width:100%;}
}

/* ---------- Feature list rows ---------- */
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center;padding:44px 0;border-top:1px solid var(--line-soft);}
.feature-row:first-of-type{border-top:none;}
.feature-row.reverse{direction:rtl;}
.feature-row.reverse>*{direction:ltr;}
.feature-row h3{font-size:21px;}
.feature-row .fig{
  background:var(--ice-50);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:24px;display:flex;align-items:center;justify-content:center;
}
@media (max-width:820px){.feature-row,.feature-row.reverse{grid-template-columns:1fr;direction:ltr;}}

.checklist{list-style:none;padding:0;margin:14px 0 0;}
.checklist li{display:flex;gap:10px;font-size:14.5px;color:var(--text-700);margin-bottom:9px;}
.checklist li::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--blue-600);margin-top:9px;}

/* ---------- Matrix ---------- */
.matrix-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
@media (max-width:980px){.matrix-grid{grid-template-columns:repeat(3,1fr);}}
@media (max-width:680px){.matrix-grid{grid-template-columns:repeat(2,1fr);}}
.matrix-item{
  background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.12);
  border-radius:var(--radius-md);padding:18px;
}
.matrix-item .ic{width:36px;height:36px;border-radius:10px;background:rgba(34,211,238,.16);display:flex;align-items:center;justify-content:center;margin-bottom:10px;}
.matrix-item .ic svg{width:19px;height:19px;stroke:var(--cyan-300);fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.matrix-item h4{color:#fff;font-size:14.5px;margin-bottom:5px;}
.matrix-item p{color:var(--ice-200);font-size:12.8px;margin:0;}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:18px 4px;font-size:15.5px;font-weight:600;color:var(--text-900);
  display:flex;justify-content:space-between;align-items:center;gap:16px;
}
.faq-q::after{content:"+";font-size:20px;color:var(--blue-600);flex:none;transition:transform .2s;}
.faq-item.open .faq-q::after{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;font-size:14.5px;color:var(--text-500);}
.faq-item.open .faq-a{max-height:600px;}
.faq-a-inner{padding:0 4px 18px;}

/* ---------- CTA band ---------- */
.cta-band{
  background:linear-gradient(120deg,var(--navy-950),var(--navy-800));
  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;gap:12px;justify-content:center;flex-wrap:wrap;}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-950);color:var(--text-400);padding:52px 0 24px;}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:28px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.08);}
.footer-brand{color:var(--ice-100);}
.footer-brand .brand{color:#fff;margin-bottom:10px;}
.footer-brand p{font-size:13.5px;color:var(--text-400);max-width:280px;}
.footer-col h5{color:var(--ice-100);font-size:13.5px;letter-spacing:.03em;margin-bottom:14px;}
.footer-col ul{list-style:none;padding:0;margin:0;}
.footer-col li{margin-bottom:9px;}
.footer-col a{color:var(--text-400);font-size:13.8px;}
.footer-col a:hover{color:var(--cyan-300);text-decoration:none;}
.footer-bottom{padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12.8px;}
@media (max-width:900px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.footer-grid{grid-template-columns:1fr;}}

/* ---------- Article page ---------- */
.article-layout{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:44px;align-items:start;}
@media (max-width:960px){.article-layout{grid-template-columns:1fr;}}
.article-head{margin-bottom:8px;}
.article-cat{color:var(--blue-600);font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.04em;}
.article-head h1{font-size:clamp(24px,3.4vw,34px);margin:10px 0 16px;}
.article-meta{display:flex;flex-wrap:wrap;gap:16px;font-size:13.5px;color:var(--text-500);padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:28px;}
.article-meta .author{display:flex;align-items:center;gap:8px;color:var(--text-700);font-weight:600;}
.article-meta .avatar{width:28px;height:28px;border-radius:50%;background:var(--ice-200);flex:none;}
.article-body{font-size:16.5px;color:var(--text-700);}
.article-body h2{font-size:21px;margin-top:1.6em;}
.article-body p{margin-bottom:1.15em;}
.article-body ul,.article-body ol{margin-bottom:1.15em;}
.article-body li{margin-bottom:.4em;}
.article-body figure{margin:1.6em 0;}
.article-body figcaption{font-size:13px;color:var(--text-400);margin-top:8px;text-align:center;}
.article-body a{border-bottom:1px solid rgba(47,111,237,.35);}
.article-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:34px;}
.share-row{display:flex;gap:10px;margin-top:20px;align-items:center;font-size:13.5px;color:var(--text-500);}

.sidebar-box{background:var(--ice-50);border:1px solid var(--line);border-radius:var(--radius-md);padding:20px;margin-bottom:20px;}
.sidebar-box h4{font-size:14.5px;margin-bottom:12px;}
.sidebar-box .mini-card{display:flex;gap:10px;margin-bottom:14px;}
.sidebar-box .mini-card:last-child{margin-bottom:0;}
.sidebar-box .mini-card .n{flex:none;width:26px;height:26px;border-radius:50%;background:var(--blue-600);color:#fff;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center;}
.sidebar-box .mini-card a{color:var(--text-900);font-size:13.8px;font-weight:600;line-height:1.5;}
.sidebar-box .mini-card a:hover{color:var(--blue-600);}

.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:22px;}
@media (max-width:760px){.related-grid{grid-template-columns:1fr;}}

/* ---------- Author page ---------- */
.author-hero{display:flex;gap:24px;align-items:center;padding:36px 0;}
.author-hero .avatar-lg{width:88px;height:88px;border-radius:22px;flex:none;background:linear-gradient(135deg,var(--blue-600),var(--cyan-400));}
.author-focus{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px;}

/* ---------- Forms ---------- */
.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-field{margin-bottom:16px;}
.form-field label{display:block;font-size:13.8px;font-weight:600;color:var(--text-700);margin-bottom:6px;}
.form-field input{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:var(--radius-sm);
  font-size:14.5px;font-family:var(--font);
}
.form-field input:focus{outline:2px solid var(--blue-500);outline-offset:1px;border-color:var(--blue-500);}
.form-note{font-size:12.8px;color:var(--text-500);text-align:center;margin-top:16px;}
.form-note a{font-weight:600;}
.notice-box{background:var(--ice-50);border:1px solid var(--line);border-radius:var(--radius-md);padding:16px 18px;font-size:13.8px;color:var(--text-500);margin-bottom:20px;}
.notice-box strong{color:var(--text-900);}

/* ---------- Table ---------- */
.table-wrap{overflow-x:auto;margin:1.4em 0;}
table.plain{border-collapse:collapse;width:100%;font-size:14.5px;}
table.plain th,table.plain td{border:1px solid var(--line);padding:10px 12px;text-align:left;}
table.plain th{background:var(--ice-50);font-weight:700;color:var(--text-900);}

/* ---------- Static content pages (about/privacy/terms) ---------- */
.doc-page{max-width:820px;margin:0 auto;}
.doc-page h2{margin-top:1.8em;}
.doc-page .updated{color:var(--text-400);font-size:13.5px;margin-bottom:30px;}

/* ---------- Search page ---------- */
.search-box{display:flex;gap:10px;max-width:640px;margin:0 auto 30px;}
.search-box input{flex:1;padding:13px 16px;border:1px solid var(--line);border-radius:999px;font-size:15px;}
.search-result{padding:18px 0;border-bottom:1px solid var(--line-soft);}
.search-result .url{color:var(--success);font-size:12.8px;margin-bottom:4px;}
.search-result h3{font-size:17px;margin-bottom:6px;}
.search-result p{color:var(--text-500);font-size:14px;margin:0;}

/* ---------- Utilities ---------- */
.mt-0{margin-top:0;}
.text-center{text-align:center;}
.badge-dot{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--success);font-weight:600;}
.badge-dot::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--success);}
.back-to-top{position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:50%;background:var(--navy-900);color:#fff;display:none;align-items:center;justify-content:center;box-shadow:var(--shadow-pop);border:none;cursor:pointer;z-index:50;}
.back-to-top.show{display:flex;}