/* ==========================================================================
   百家乐官网 style.css
   上海百家乐ai大模型公司 / baijiale-h5.com.cn
   设计定位：Private Home AI + Edge Security Center + Energy Intelligence OS
   ========================================================================== */

:root{
  --graphite-900:#12161c;
  --graphite-800:#1a2028;
  --graphite-700:#242c37;
  --graphite-600:#333d4a;
  --graphite-500:#4a5567;
  --graphite-300:#8994a3;
  --graphite-100:#c9d0d9;
  --cool-white:#f5f7fa;
  --paper:#ffffff;
  --deep-blue:#1c3a6e;
  --deep-blue-700:#152c54;
  --security-cyan:#0e8f9c;
  --security-cyan-soft:#e3f5f6;
  --energy-green:#2f8f5b;
  --energy-green-soft:#e6f4ec;
  --warn-amber:#b8720f;
  --warn-amber-soft:#fbedd8;
  --risk-low:#2f8f5b;
  --risk-medium:#b8720f;
  --risk-high:#b13b3b;
  --border-soft:#e1e6ec;
  --border-mid:#d3dae2;
  --shadow-sm:0 1px 2px rgba(18,22,28,.06),0 1px 1px rgba(18,22,28,.04);
  --shadow-md:0 6px 20px rgba(18,22,28,.08);
  --shadow-lg:0 16px 40px rgba(18,22,28,.12);
  --radius-sm:6px;
  --radius-md:12px;
  --radius-lg:20px;
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-mono:"SFMono-Regular",Consolas,"Courier New",monospace;
  --maxw:1160px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  background:var(--cool-white);
  color:var(--graphite-800);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{max-width:100%;display:block;}
a{color:var(--deep-blue);text-decoration:none;}
a:hover{color:var(--security-cyan);}
ul,ol{padding-left:1.3em;}
h1,h2,h3,h4{
  font-weight:700;
  line-height:1.35;
  color:var(--graphite-900);
  margin:0 0 .6em;
}
h1{font-size:clamp(1.7rem,3.4vw,2.5rem);}
h2{font-size:clamp(1.35rem,2.4vw,1.9rem);}
h3{font-size:clamp(1.12rem,1.8vw,1.35rem);}
p{margin:0 0 1em;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px;}
.section{padding:64px 0;}
.section--tight{padding:40px 0;}
.section--alt{background:var(--paper);}
.section--dark{background:var(--graphite-900);color:var(--graphite-100);}
.section--dark h2,.section--dark h3{color:#fff;}
.section-head{max-width:760px;margin:0 0 36px;}
.section-head .eyebrow{margin-bottom:10px;}
.section-head p{color:var(--graphite-500);font-size:1.02rem;}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:-999px;top:0;background:var(--deep-blue);color:#fff;
  padding:10px 16px;z-index:200;border-radius:0 0 8px 0;
}
.skip-link:focus{left:0;}

/* ---------- Eyebrow / Badge / Tag ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:.8rem;font-weight:600;letter-spacing:.02em;
  color:var(--security-cyan);
  background:var(--security-cyan-soft);
  padding:4px 12px;border-radius:999px;
}
.eyebrow--energy{color:var(--energy-green);background:var(--energy-green-soft);}
.eyebrow--amber{color:var(--warn-amber);background:var(--warn-amber-soft);}
.eyebrow--blue{color:var(--deep-blue);background:#e7edf7;}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 14px;}
.tag{
  font-size:.76rem;color:var(--graphite-500);
  border:1px solid var(--border-mid);border-radius:999px;
  padding:3px 10px;background:var(--paper);
}
.risk-chip{
  display:inline-flex;align-items:center;gap:6px;
  font-size:.76rem;font-weight:700;padding:3px 11px;border-radius:999px;
}
.risk-chip.low{color:var(--risk-low);background:var(--energy-green-soft);}
.risk-chip.medium{color:var(--risk-medium);background:var(--warn-amber-soft);}
.risk-chip.high{color:var(--risk-high);background:#fbe4e4;}
.risk-chip::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor;}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--cool-white);
  border-bottom:1px solid var(--border-soft);
}
.header-inner{
  max-width:var(--maxw);margin:0 auto;padding:0 20px;
  display:flex;align-items:center;justify-content:space-between;
  height:66px;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--graphite-900);font-size:1.08rem;}
.brand img{width:34px;height:34px;}
.brand small{display:block;font-weight:500;font-size:.68rem;color:var(--graphite-500);}
.main-nav{display:flex;align-items:center;gap:2px;}
.main-nav a{
  padding:9px 13px;border-radius:8px;font-size:.92rem;color:var(--graphite-700);font-weight:500;
  white-space:nowrap;
}
.main-nav a:hover,.main-nav a[aria-current="page"]{background:var(--graphite-900);color:#fff;}
.nav-toggle{
  display:none;background:none;border:1px solid var(--border-mid);border-radius:8px;
  width:40px;height:40px;align-items:center;justify-content:center;cursor:pointer;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:18px;height:2px;background:var(--graphite-800);position:relative;
}
.nav-toggle span::before{position:absolute;top:-6px;}
.nav-toggle span::after{position:absolute;top:6px;}

@media (max-width:960px){
  .main-nav{
    position:fixed;inset:66px 0 0 0;background:var(--paper);
    flex-direction:column;align-items:stretch;padding:14px;gap:4px;
    transform:translateY(-8px);opacity:0;pointer-events:none;
    transition:opacity .18s ease,transform .18s ease;
    overflow-y:auto;
  }
  .main-nav.is-open{opacity:1;pointer-events:auto;transform:translateY(0);}
  .main-nav a{padding:13px 14px;border-radius:10px;border:1px solid var(--border-soft);}
  .nav-toggle{display:flex;}
}

/* ---------- Hero ---------- */
.hero{
  padding:56px 0 60px;
  background:
    radial-gradient(900px 420px at 82% -10%, rgba(14,143,156,.14), transparent 60%),
    radial-gradient(700px 380px at -10% 110%, rgba(28,58,110,.12), transparent 60%),
    var(--cool-white);
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;}
.hero h1{margin-bottom:.5em;}
.hero .lede{font-size:1.14rem;color:var(--graphite-700);margin-bottom:.7em;}
.hero .sub{color:var(--graphite-500);font-size:.98rem;}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px;}
.hero-figure{
  background:var(--graphite-900);border-radius:var(--radius-lg);
  padding:22px;box-shadow:var(--shadow-lg);
}
.hero-figure figcaption{
  color:var(--graphite-300);font-size:.78rem;text-align:center;margin-top:10px;
}
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:10px;font-weight:600;font-size:.95rem;
  border:1px solid transparent;cursor:pointer;line-height:1.2;
}
.btn-primary{background:var(--deep-blue);color:#fff;}
.btn-primary:hover{background:var(--deep-blue-700);color:#fff;}
.btn-outline{background:transparent;border-color:var(--border-mid);color:var(--graphite-800);}
.btn-outline:hover{border-color:var(--security-cyan);color:var(--security-cyan);}
.btn-cyan{background:var(--security-cyan);color:#fff;}
.btn-cyan:hover{background:#0b7681;color:#fff;}

/* ---------- Grid / 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:960px){.grid-3{grid-template-columns:repeat(2,1fr);} .grid-4{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr;}}

.card{
  background:var(--paper);border:1px solid var(--border-soft);border-radius:var(--radius-md);
  padding:22px;box-shadow:var(--shadow-sm);
}
.card h3{margin-bottom:.4em;}
.card p{color:var(--graphite-500);font-size:.95rem;margin-bottom:0;}
.card-icon{width:40px;height:40px;margin-bottom:14px;}

.pillar-card{
  background:var(--paper);border:1px solid var(--border-soft);border-radius:var(--radius-lg);
  padding:26px;display:flex;flex-direction:column;gap:10px;height:100%;
}
.pillar-card .pillar-link{margin-top:auto;font-weight:600;font-size:.92rem;}

/* ---------- Article blocks (long-form SEO copy) ---------- */
.article-block{
  background:var(--paper);border:1px solid var(--border-soft);border-radius:var(--radius-lg);
  padding:34px clamp(20px,4vw,42px);margin-bottom:28px;
}
.article-block .eyebrow{margin-bottom:14px;}
.article-block h2{margin-bottom:.5em;}
.article-block h3{margin-top:1.4em;}
.article-block p{color:var(--graphite-700);}
.article-block p+h3{margin-top:1.6em;}
.article-meta{
  display:flex;flex-wrap:wrap;gap:10px 18px;color:var(--graphite-500);
  font-size:.82rem;margin-bottom:18px;
}
.article-figure{margin:22px 0;background:var(--cool-white);border:1px solid var(--border-soft);
  border-radius:var(--radius-md);padding:18px;}
.article-figure figcaption{font-size:.78rem;color:var(--graphite-500);margin-top:10px;text-align:center;}
.callout{
  border-left:3px solid var(--security-cyan);background:var(--security-cyan-soft);
  padding:14px 18px;border-radius:0 10px 10px 0;margin:18px 0;font-size:.94rem;color:var(--graphite-800);
}
.callout--amber{border-color:var(--warn-amber);background:var(--warn-amber-soft);}
.callout--energy{border-color:var(--energy-green);background:var(--energy-green-soft);}

/* ---------- Observation strip (index only) ---------- */
.observe-card{
  background:var(--graphite-900);color:var(--graphite-100);border-radius:var(--radius-lg);
  padding:26px;
}
.observe-card h3{color:#fff;}
.observe-card p{color:var(--graphite-300);font-size:.94rem;}

/* ---------- Summary cards linking to subpages ---------- */
.summary-card{
  background:var(--paper);border:1px solid var(--border-soft);border-radius:var(--radius-md);
  padding:20px;height:100%;display:flex;flex-direction:column;
}
.summary-card h4{font-size:1.02rem;margin-bottom:.5em;color:var(--graphite-900);}
.summary-card p{color:var(--graphite-500);font-size:.9rem;flex-grow:1;}
.summary-card .more-link{font-size:.86rem;font-weight:600;margin-top:10px;}

/* ---------- Hub link row ---------- */
.hub-links{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}
@media (max-width:960px){.hub-links{grid-template-columns:repeat(2,1fr);}}
@media (max-width:640px){.hub-links{grid-template-columns:1fr;}}
.hub-link{
  display:block;background:var(--paper);border:1px solid var(--border-soft);
  border-radius:var(--radius-md);padding:16px 18px;font-size:.9rem;color:var(--graphite-700);
}
.hub-link strong{display:block;color:var(--graphite-900);margin-bottom:4px;font-size:.98rem;}
.hub-link:hover{border-color:var(--security-cyan);}

/* ---------- Timeline (energy scheduling) ---------- */
.timeline{overflow-x:auto;padding-bottom:8px;}
.timeline-track{
  display:grid;grid-auto-flow:column;grid-auto-columns:64px;gap:2px;min-width:640px;
  align-items:end;height:120px;margin-bottom:10px;
}
.timeline-bar{background:var(--border-mid);border-radius:4px 4px 0 0;position:relative;}
.timeline-bar[data-level="low"]{background:var(--energy-green);height:28%;}
.timeline-bar[data-level="mid"]{background:var(--warn-amber);height:58%;}
.timeline-bar[data-level="high"]{background:var(--risk-high);height:92%;}
.timeline-labels{display:grid;grid-auto-flow:column;grid-auto-columns:64px;gap:2px;min-width:640px;}
.timeline-labels span{font-size:.68rem;color:var(--graphite-500);text-align:center;}

/* ---------- Tabs ---------- */
.tabbar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px;}
.tabbar button{
  padding:9px 16px;border-radius:999px;border:1px solid var(--border-mid);
  background:var(--paper);font-size:.88rem;font-weight:600;color:var(--graphite-600);cursor:pointer;
}
.tabbar button[aria-selected="true"]{background:var(--graphite-900);color:#fff;border-color:var(--graphite-900);}
.tabpanel{display:none;}
.tabpanel.is-active{display:block;}

/* ---------- Table ---------- */
.table-wrap{overflow-x:auto;}
table{width:100%;border-collapse:collapse;min-width:560px;font-size:.9rem;}
th,td{padding:11px 14px;border-bottom:1px solid var(--border-soft);text-align:left;vertical-align:top;}
th{background:var(--graphite-900);color:#fff;font-weight:600;}
tr:nth-child(even) td{background:#fafbfc;}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--border-soft);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;cursor:pointer;
  padding:16px 4px;font-weight:600;font-size:.98rem;color:var(--graphite-900);
  display:flex;justify-content:space-between;gap:16px;align-items:center;
}
.faq-q::after{content:"+";font-size:1.3rem;color:var(--security-cyan);flex-shrink:0;}
.faq-item.is-open .faq-q::after{content:"−";}
.faq-a{display:none;padding:0 4px 16px;color:var(--graphite-500);font-size:.92rem;}
.faq-item.is-open .faq-a{display:block;}
.faq-columns{columns:1;}
@media(min-width:860px){.faq-columns{columns:2;column-gap:36px;} .faq-item{break-inside:avoid;}}

/* ---------- Scenario / case box ---------- */
.scenario-box{
  background:var(--graphite-900);color:var(--graphite-100);border-radius:var(--radius-md);
  padding:20px;font-size:.88rem;
}
.scenario-box dl{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:0;}
.scenario-box dt{color:var(--graphite-300);}
.scenario-box dd{margin:0;color:#fff;font-weight:600;}
.scenario-note{font-size:.78rem;color:var(--graphite-300);margin-top:12px;border-top:1px solid var(--graphite-700);padding-top:10px;}

/* ---------- App mockup ---------- */
.app-mock{
  background:var(--graphite-900);border-radius:28px;padding:16px;box-shadow:var(--shadow-lg);
  max-width:300px;margin:0 auto;
}
.app-mock-screen{background:var(--graphite-800);border-radius:18px;padding:16px;color:#fff;}
.app-mock-row{
  display:flex;justify-content:space-between;align-items:center;
  padding:10px 0;border-bottom:1px solid var(--graphite-700);font-size:.78rem;
}
.app-mock-row:last-child{border-bottom:none;}
.app-mock-row .label{color:var(--graphite-300);}
.app-mock-row .val{font-weight:700;}
.app-mock-caption{text-align:center;color:var(--graphite-500);font-size:.76rem;margin-top:10px;}

/* ---------- Breadcrumb ---------- */
.breadcrumb{font-size:.82rem;color:var(--graphite-500);padding:14px 0;}
.breadcrumb a{color:var(--graphite-500);}
.breadcrumb a:hover{color:var(--security-cyan);}

/* ---------- Footer ---------- */
.site-footer{background:var(--graphite-900);color:var(--graphite-300);padding:48px 0 24px;margin-top:40px;}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:28px;margin-bottom:32px;}
.footer-col h5{color:#fff;font-size:.88rem;margin:0 0 12px;}
.footer-col a{display:block;color:var(--graphite-300);font-size:.86rem;padding:4px 0;}
.footer-col a:hover{color:var(--security-cyan);}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:10px;}
.footer-brand strong{color:#fff;font-size:1.05rem;}
.footer-col p{font-size:.83rem;color:var(--graphite-500);line-height:1.7;}
.footer-bottom{
  border-top:1px solid var(--graphite-700);padding-top:20px;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
  font-size:.8rem;color:var(--graphite-500);
}
@media (max-width:860px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:560px){.footer-grid{grid-template-columns:1fr;}}

/* ---------- Back to top ---------- */
.back-top{
  position:fixed;right:20px;bottom:20px;width:44px;height:44px;border-radius:50%;
  background:var(--graphite-900);color:#fff;border:none;cursor:pointer;
  display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-md);
  opacity:0;pointer-events:none;transition:opacity .2s ease;z-index:90;
}
.back-top.is-visible{opacity:1;pointer-events:auto;}

/* ---------- Utility ---------- */
.mt-0{margin-top:0;}
.text-center{text-align:center;}
.divider{height:1px;background:var(--border-soft);margin:40px 0;}
.small-note{font-size:.8rem;color:var(--graphite-500);}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start;}
@media (max-width:860px){.two-col{grid-template-columns:1fr;}}
.stat-row{display:flex;flex-wrap:wrap;gap:22px;margin:18px 0;}
.stat{min-width:120px;}
.stat b{display:block;font-size:1.3rem;color:var(--graphite-900);}
.stat span{font-size:.78rem;color:var(--graphite-500);}