/* ============================================================
   新智 AI 官网 · 全站样式（浅色商务简洁主题）
   ============================================================ */
:root{
  --blue:#1B4DE4;
  --blue-d:#1540C0;
  --ink:#0A2540;
  --orange:#FF7A1A;
  --bg:#F5F7FA;
  --white:#FFFFFF;
  --line:#E6EAF1;
  --text:#27313F;
  --muted:#6B7585;
  --radius:14px;
  --shadow:0 8px 30px rgba(16,38,76,.08);
  --shadow-sm:0 4px 16px rgba(16,38,76,.06);
  --maxw:1200px;
  --header-h:68px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",
    "Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--text);
  background:var(--white);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink);letter-spacing:.5px}
.logo .mark{
  width:30px;height:30px;border-radius:8px;
  background:linear-gradient(135deg,var(--blue),#5B8CFF);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;
  box-shadow:0 4px 12px rgba(27,77,228,.35);
}
.logo small{font-weight:500;color:var(--muted);font-size:12px;letter-spacing:1px}
.main-nav{display:flex;gap:4px;flex-wrap:wrap}
.main-nav a{
  padding:8px 13px;border-radius:8px;font-size:14.5px;color:var(--text);
  font-weight:500;transition:.18s;white-space:nowrap;
}
.main-nav a:hover{color:var(--blue);background:var(--bg)}
.main-nav a.active{color:#fff;background:var(--blue)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;
  width:42px;height:38px;cursor:pointer;font-size:18px;color:var(--ink)}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(1200px 500px at 80% -10%,rgba(27,77,228,.10),transparent 60%),
    radial-gradient(900px 500px at 0% 110%,rgba(255,122,26,.08),transparent 55%),
    linear-gradient(180deg,#F7F9FF,#FFFFFF);
  padding:96px 0 84px;
}
.hero-inner{max-width:820px}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1.5px;
  color:var(--blue);background:rgba(27,77,228,.10);padding:6px 14px;border-radius:999px;margin-bottom:22px}
.hero h1{font-size:46px;line-height:1.18;color:var(--ink);font-weight:800;letter-spacing:-.5px}
.hero h1 .ac{color:var(--blue)}
.hero p.lead{font-size:19px;color:var(--muted);margin-top:22px;max-width:700px}
.hero-btns{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:10px;
  font-weight:700;font-size:15px;transition:.18s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 8px 20px rgba(27,77,228,.28)}
.btn-primary:hover{background:var(--blue-d);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}

/* ---------- Section ---------- */
.section{padding:78px 0}
.section.alt{background:var(--bg)}
.section-head{max-width:760px;margin:0 auto 46px;text-align:center}
.section-head .eyebrow{margin-bottom:14px}
.section-head h2{font-size:32px;color:var(--ink);font-weight:800;letter-spacing:-.3px}
.section-head p{color:var(--muted);margin-top:14px;font-size:16.5px}
.section-head.left{margin-left:0;text-align:left}

/* ---------- Grid ---------- */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ---------- Card ---------- */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-sm);transition:.2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.card .ico{width:48px;height:48px;border-radius:12px;background:rgba(27,77,228,.10);
  color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:16px}
.card h3{font-size:19px;color:var(--ink);margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.card .tag{display:inline-block;margin-top:14px;font-size:12.5px;font-weight:700;color:var(--blue);background:rgba(27,77,228,.08);padding:4px 10px;border-radius:6px}

/* ---------- Stat ---------- */
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center;box-shadow:var(--shadow-sm)}
.stat .num{font-size:40px;font-weight:800;color:var(--blue);line-height:1}
.stat .num .u{font-size:18px;margin-left:3px}
.stat .label{color:var(--muted);margin-top:10px;font-size:14.5px}
.stat.alt .num{color:var(--orange)}

/* ---------- Flywheel ---------- */
.flywheel{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative}
.fw-step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);position:relative}
.fw-step .n{width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;margin-bottom:12px}
.fw-step h4{color:var(--ink);font-size:17px;margin-bottom:6px}
.fw-step p{color:var(--muted);font-size:14px}
.fw-step .kw{margin-top:12px;font-size:13px;font-weight:700;color:var(--orange)}

/* ---------- Split ---------- */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.split h2{font-size:30px;color:var(--ink);font-weight:800;margin-bottom:18px}
.split p{color:var(--muted);margin-bottom:14px}
.split ul.ticks li{position:relative;padding-left:28px;margin-bottom:10px;color:var(--text)}
.split ul.ticks li::before{content:"";position:absolute;left:0;top:9px;width:18px;height:18px;
  border-radius:50%;background:rgba(27,77,228,.12) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%231B4DE4' stroke-width='3'%3E%3Cpath d='M5 13l4 4L19 7'/%3E%3C/svg%3E") center/12px no-repeat}

/* ---------- Timeline ---------- */
.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tl-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);border-top:4px solid var(--blue)}
.tl-item .yr{display:inline-block;font-size:13px;font-weight:800;color:var(--blue);background:rgba(27,77,228,.08);padding:4px 12px;border-radius:6px}
.tl-item h4{color:var(--ink);font-size:18px;margin:14px 0 8px}
.tl-item p{color:var(--muted);font-size:14.5px}
.tl-item .acts{margin-top:14px;border-top:1px dashed var(--line);padding-top:12px;font-size:14px;color:var(--text)}
.tl-item.alt{border-top-color:var(--orange)}
.tl-item.alt .yr{color:var(--orange);background:rgba(255,122,26,.10)}

/* ---------- Table ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm)}
.tbl{width:100%;border-collapse:collapse;font-size:14.5px;min-width:640px}
.tbl th,..tbl td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line)}
.tbl thead th{background:var(--ink);color:#fff;font-weight:700;font-size:14px}
.tbl tbody tr:nth-child(even){background:var(--bg)}
.tbl tbody tr:hover{background:rgba(27,77,228,.04)}
.tbl td b{color:var(--ink)}

/* ---------- Case grid ---------- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.case{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:.2s}
.case:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.case .ph{height:150px;background:linear-gradient(135deg,#EAF0FF,#F6F9FF);display:flex;align-items:center;justify-content:center;color:var(--blue);font-size:13px;font-weight:600;border-bottom:1px solid var(--line);text-align:center;padding:0 14px}
.case .thumb{width:100%;height:170px;object-fit:cover;display:block;border-bottom:1px solid var(--line);background:#EAF0FF}
.case .body{padding:18px 20px}
.case .body h4{color:var(--ink);font-size:16.5px;margin-bottom:6px}
.case .body p{color:var(--muted);font-size:14px}
.case .tag{display:inline-block;margin-top:10px;font-size:12px;font-weight:700;color:var(--orange);background:rgba(255,122,26,.10);padding:3px 9px;border-radius:6px}

/* ---------- Placeholder visual ---------- */
.placeholder{background:linear-gradient(135deg,#EAF0FF,#F6F9FF);border:1px dashed #C4D2F5;
  border-radius:var(--radius);display:flex;align-items:center;justify-content:center;
  color:var(--blue);font-size:14px;font-weight:600;text-align:center;padding:24px}
.ph-16x9{aspect-ratio:16/9}
.ph-4x3{aspect-ratio:4/3}
.ph-1x1{aspect-ratio:1/1}

/* ---------- Pills ---------- */
.pills{display:flex;flex-wrap:wrap;gap:10px}
.pill{font-size:13.5px;font-weight:600;color:var(--blue);background:rgba(27,77,228,.08);
  padding:7px 14px;border-radius:999px;border:1px solid rgba(27,77,228,.12)}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(120deg,var(--ink),#10356B);color:#fff;border-radius:20px;
  padding:54px 48px;text-align:center;margin:0 0}
.cta-band h2{font-size:30px;margin-bottom:12px}
.cta-band p{color:rgba(255,255,255,.78);margin-bottom:26px;font-size:16.5px}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72);padding:56px 0 28px;margin-top:0}
.footer-cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px}
.footer-cols .logo{color:#fff;margin-bottom:14px}
.footer-cols p{font-size:14.5px;line-height:1.8}
.footer-cols h5{color:#fff;font-size:15px;margin-bottom:14px;font-weight:700}
.footer-cols ul li{margin-bottom:9px;font-size:14px}
.footer-cols ul li a:hover{color:#fff}
.footer-cols a{color:rgba(255,255,255,.72)}
.footer-cols a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:20px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:rgba(255,255,255,.55)}
.footer-bottom .icp-link{color:rgba(255,255,255,.72);text-decoration:none}
.footer-bottom .icp-link:hover{color:#fff;text-decoration:underline}

/* ---------- Generic helpers ---------- */
.mt-s{margin-top:14px}.mt-m{margin-top:26px}.mt-l{margin-top:40px}
.lead-t{font-size:18px;color:var(--muted);max-width:760px}
.center{text-align:center}
.note{font-size:13px;color:var(--muted);margin-top:10px}
.hl{color:var(--blue);font-weight:700}
.hl-o{color:var(--orange);font-weight:700}
h3.block-title{font-size:22px;color:var(--ink);margin:38px 0 18px;font-weight:800;
  padding-left:14px;border-left:4px solid var(--blue)}

/* ============================================================
   统一高端简约组件（新增）
   ============================================================ */

/* ---------- Premium Table（高端简约表格，全站统一） ---------- */
.table-premium{font-size:14.5px}
.table-premium thead th{
  background:linear-gradient(180deg,#1B4DE4 0%,#1740C8 100%);
  color:#fff;font-weight:700;font-size:14px;text-align:left;
  padding:16px 18px;border:none;letter-spacing:.3px;white-space:nowrap}
.table-premium td{padding:16px 18px;border-bottom:1px solid var(--line);color:var(--text);vertical-align:top;line-height:1.6}
.table-premium tbody tr:nth-child(even){background:transparent}
.table-premium tbody tr:hover{background:rgba(27,77,228,.045)}
.table-premium tbody tr:last-child td{border-bottom:none}
.table-premium td:first-child{font-weight:700;color:var(--ink)}
.table-premium td b,.table-premium td strong{color:var(--ink)}
.table-premium .star{color:var(--orange);font-weight:800;margin-left:2px}

/* ---------- Tier Cards（三类班型高端卡片） ---------- */
.tier{position:relative;background:#fff;border:1px solid var(--line);border-radius:16px;
  padding:30px 26px 26px;box-shadow:var(--shadow-sm);transition:.2s;overflow:hidden;display:flex;flex-direction:column}
.tier:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.tier.featured{border-color:var(--blue);box-shadow:0 14px 38px rgba(27,77,228,.16)}
.tier.featured::before{content:"";position:absolute;inset:0 0 auto 0;height:4px;background:linear-gradient(90deg,var(--blue),var(--orange))}
.tier .badge{display:inline-block;align-self:flex-start;font-size:12.5px;font-weight:800;color:#fff;
  background:linear-gradient(135deg,var(--blue),#5B8CFF);padding:6px 14px;border-radius:999px;margin-bottom:16px}
.tier h3{font-size:21px;color:var(--ink);margin-bottom:4px}
.tier .dur{font-size:14px;color:var(--blue);font-weight:700;margin-bottom:16px}
.tier ul{margin-top:auto}
.tier ul li{position:relative;padding-left:22px;margin-bottom:11px;font-size:14.5px;color:var(--text);line-height:1.5}
.tier ul li::before{content:"▸";position:absolute;left:0;top:0;color:var(--blue);font-weight:800}
.tier .out{margin-top:16px;padding-top:14px;border-top:1px dashed var(--line);font-size:14px;color:var(--muted)}
.tier .out b{color:var(--ink)}

/* ---------- Coop Cards（三大合作体系高端卡片） ---------- */
.coop{background:#fff;border:1px solid var(--line);border-radius:16px;padding:30px;
  box-shadow:var(--shadow-sm);transition:.2s;border-top:4px solid var(--blue);position:relative}
.coop:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.coop .ci{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,var(--blue),#5B8CFF);
  color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;margin-bottom:16px}
.coop h3{font-size:20px;color:var(--ink);margin-bottom:8px}
.coop .gov{display:inline-block;font-size:12px;font-weight:700;color:var(--orange);
  background:rgba(255,122,26,.10);padding:3px 10px;border-radius:6px;margin-bottom:12px}
.coop p{color:var(--muted);font-size:14.5px;margin-bottom:10px;line-height:1.6}
.coop .val{margin-top:12px;padding-top:12px;border-top:1px dashed var(--line);font-size:14px;color:var(--text)}
.coop .val b{color:var(--ink)}
.coop p b{color:var(--ink);font-weight:700}

/* ---------- Media Figure（配图 + 说明，统一） ---------- */
.media-figure{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow-sm);background:#fff}
.media-figure img{width:100%;display:block}
.media-figure figcaption{padding:12px 16px;font-size:13.5px;color:var(--muted);background:var(--bg);
  border-top:1px solid var(--line);text-align:center}

/* ---------- Video Poster（视频案例海报 + 播放按钮） ---------- */
.video-poster{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow);aspect-ratio:16/9;cursor:pointer;background:#0A2540}
.video-poster img{width:100%;height:100%;object-fit:cover;display:block}
.video-poster .ov{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(180deg,rgba(10,37,64,.12),rgba(10,37,64,.48))}
.video-poster .play{width:74px;height:74px;border-radius:50%;background:rgba(255,255,255,.94);
  display:flex;align-items:center;justify-content:center;box-shadow:0 10px 30px rgba(0,0,0,.32);transition:.2s}
.video-poster:hover .play{transform:scale(1.06)}
.video-poster .play::after{content:"";border-style:solid;border-width:13px 0 13px 23px;
  border-color:transparent transparent transparent var(--blue);margin-left:6px}
.video-poster .cap{position:absolute;left:20px;bottom:16px;color:#fff;font-size:15px;font-weight:700;
  text-shadow:0 2px 8px rgba(0,0,0,.55)}
.video-poster .dur{position:absolute;right:16px;top:14px;background:rgba(10,37,64,.72);color:#fff;
  font-size:13px;font-weight:700;padding:4px 10px;border-radius:6px}

/* ---------- Loop Strip（产业闭环 5 步条） ---------- */
.loop-strip{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:30px}
.loop-strip .ls{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 14px;text-align:center;
  box-shadow:var(--shadow-sm);position:relative}
.loop-strip .ls .n{width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;font-weight:800;
  font-size:14px;margin:0 auto 10px;display:flex;align-items:center;justify-content:center}
.loop-strip .ls h4{font-size:15px;color:var(--ink);margin-bottom:4px}
.loop-strip .ls p{font-size:12.5px;color:var(--muted);line-height:1.5}
.loop-strip .ls:not(:last-child)::after{content:"→";position:absolute;right:-12px;top:50%;
  transform:translateY(-50%);color:var(--blue);font-weight:800;font-size:18px}

@media(max-width:900px){
  .loop-strip{grid-template-columns:repeat(2,1fr)}
  .loop-strip .ls:not(:last-child)::after{display:none}
}
@media(max-width:560px){.loop-strip{grid-template-columns:1fr}}

/* ---------- Mobile drawer ---------- */
@media(max-width:1024px){
  .main-nav{position:fixed;top:var(--header-h);left:0;right:0;bottom:0;
    background:#fff;flex-direction:column;padding:18px 24px;gap:6px;
    transform:translateX(100%);transition:.25s;z-index:99;overflow-y:auto}
  .main-nav.open{transform:translateX(0)}
  .main-nav a{padding:14px 12px;font-size:16px;border-bottom:1px solid var(--line)}
  .nav-toggle{display:block}
}
@media(max-width:900px){
  .grid-4,.flywheel{grid-template-columns:repeat(2,1fr)}
  .stat-row{grid-template-columns:repeat(2,1fr)}
  .case-grid,.timeline{grid-template-columns:1fr}
  .split{grid-template-columns:1fr;gap:28px}
  .footer-cols{grid-template-columns:1fr 1fr}
  .hero h1{font-size:36px}
}
@media(max-width:560px){
  .grid-2,.grid-3,.grid-4,.flywheel,.stat-row{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr}
  .section{padding:56px 0}
  .hero{padding:64px 0 56px}
}