/* ============================================================
   三点灵 3dianling.com — 官网视觉体系
   风格：工业橙 · 活力风 · 现代制造业 SaaS
   ============================================================ */
:root{
  --orange:#F4581C;
  --orange-deep:#D8430F;
  --orange-light:#FF8A50;
  --orange-tint:#FFF1EA;
  --ink:#16181D;
  --ink-2:#2A2E37;
  --steel:#5C6470;
  --line:#E8E2DA;
  --paper:#FAF7F2;
  --white:#FFFFFF;
  --yellow:#FFC531;
  --radius:14px;
  --shadow:0 8px 30px rgba(22,24,29,.08);
  --shadow-lg:0 20px 60px rgba(22,24,29,.14);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  color:var(--ink);background:var(--paper);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:1180px;margin:0 auto;padding:0 24px}

/* ---------- 工业风装饰 ---------- */
.hazard{
  height:8px;
  background:repeating-linear-gradient(-45deg,var(--orange) 0 16px,var(--ink) 16px 32px);
}
.tag{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:700;letter-spacing:.12em;
  color:var(--orange);text-transform:uppercase;
  padding:6px 14px;border:1.5px solid var(--orange);border-radius:999px;
  background:var(--orange-tint);margin-bottom:18px;
}
.tag::before{content:"";width:8px;height:8px;background:var(--orange);border-radius:2px}
.num{
  font-family:"DIN Alternate","Arial Black",sans-serif;
  font-size:44px;font-weight:900;color:transparent;
  -webkit-text-stroke:1.5px var(--orange);line-height:1;
}

/* ---------- 导航 ---------- */
header{
  position:sticky;top:0;z-index:100;
  background:rgba(250,247,242,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:800}
.logo-mark{
  width:34px;height:34px;border-radius:9px;background:var(--orange);
  display:grid;place-items:center;color:#fff;font-size:15px;font-weight:900;
  box-shadow:0 4px 12px rgba(244,88,28,.4);
}
.logo-img{
  width:46px;height:46px;display:block;flex:none;
  transition:.25s;
}
.logo:hover .logo-img{transform:rotate(-8deg) scale(1.06)}
.logo-name{font-size:21px;font-weight:800;letter-spacing:.04em;line-height:1}
.logo small{font-size:12px;font-weight:500;color:var(--steel);letter-spacing:.05em}
.nav-links{display:flex;gap:34px;font-size:15px;font-weight:500}
.nav-links a{color:var(--ink-2);padding:6px 0;border-bottom:2px solid transparent;transition:.2s}
.nav-links a:hover,.nav-links a.active{color:var(--orange);border-bottom-color:var(--orange)}
.nav-cta{display:flex;gap:12px;align-items:center}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 28px;border-radius:10px;font-size:15px;font-weight:700;
  transition:.2s;cursor:pointer;border:none;
}
.btn-primary{
  background:var(--orange);color:#fff;
  box-shadow:0 6px 20px rgba(244,88,28,.35);
}
.btn-primary:hover{background:var(--orange-deep);transform:translateY(-2px)}
.btn-ghost{border:1.5px solid var(--ink);color:var(--ink);background:transparent}
.btn-ghost:hover{background:var(--ink);color:#fff}
.btn-white{background:#fff;color:var(--ink)}
.btn-white:hover{transform:translateY(-2px)}
.btn-sm{padding:9px 20px;font-size:14px}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  padding:88px 0 96px;
  background:
    radial-gradient(900px 500px at 85% -10%,rgba(244,88,28,.14),transparent 60%),
    linear-gradient(180deg,#FFFDFA,var(--paper));
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(22,24,29,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(22,24,29,.045) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:linear-gradient(180deg,#000 30%,transparent 90%);
  -webkit-mask-image:linear-gradient(180deg,#000 30%,transparent 90%);
}
.hero-grid{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
h1{font-size:52px;line-height:1.22;font-weight:900;letter-spacing:-.01em}
h1 .hl{color:var(--orange);position:relative}
h1 .hl::after{
  content:"";position:absolute;left:0;right:0;bottom:6px;height:12px;
  background:rgba(255,197,49,.55);z-index:-1;border-radius:3px;
}
.hero p.lead{font-size:19px;color:var(--steel);margin:22px 0 34px;max-width:540px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:44px;margin-top:44px;padding-top:28px;border-top:1px solid var(--line)}
.hero-stats b{display:block;font-size:30px;font-weight:900;color:var(--ink)}
.hero-stats b i{font-style:normal;color:var(--orange);font-size:20px}
.hero-stats span{font-size:13px;color:var(--steel)}

/* Hero 视觉卡片（模拟产品界面） */
.hero-visual{position:relative}
.mock{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  box-shadow:var(--shadow-lg);overflow:hidden;
}
.mock-bar{
  display:flex;align-items:center;gap:8px;padding:12px 16px;
  background:var(--ink);color:#B8BDC7;font-size:12.5px;
}
.mock-bar .dots{display:flex;gap:6px}
.mock-bar .dots i{width:10px;height:10px;border-radius:50%;background:#3A404B}
.mock-bar .dots i:first-child{background:var(--orange)}
.mock-body{padding:20px}
.mock-row{
  display:flex;align-items:center;gap:12px;
  padding:13px 14px;border:1px solid var(--line);border-radius:11px;margin-bottom:10px;
  background:#FFFDFB;font-size:14px;font-weight:600;
}
.mock-row .app-ico{
  width:36px;height:36px;border-radius:9px;display:grid;place-items:center;
  font-size:17px;flex:none;color:#fff;
}
.mock-row .st{margin-left:auto;font-size:12px;font-weight:700;padding:4px 10px;border-radius:999px}
.st-ok{background:#E8F6EC;color:#1B8A3E}
.st-run{background:var(--orange-tint);color:var(--orange)}
.mock-agent{
  margin-top:14px;padding:14px 16px;border-radius:12px;
  background:linear-gradient(120deg,var(--ink),#2E333D);color:#EDEFF3;font-size:13.5px;
}
.mock-agent b{color:var(--yellow)}
.float-chip{
  position:absolute;background:#fff;border:1px solid var(--line);border-radius:12px;
  box-shadow:var(--shadow);padding:12px 16px;font-size:13px;font-weight:700;
}
.float-chip.tl{top:-18px;left:-26px}
.float-chip.br{bottom:-20px;right:-14px}
.float-chip span{color:var(--orange)}

/* ---------- 通用 Section ---------- */
section{padding:88px 0}
.sec-head{max-width:640px;margin-bottom:52px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
h2{font-size:36px;font-weight:900;line-height:1.3;letter-spacing:-.01em}
.sec-head p{color:var(--steel);font-size:17px;margin-top:14px}
.sec-alt{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-dark{background:var(--ink);color:#fff}
.sec-dark h2{color:#fff}
.sec-dark .sec-head p{color:#A6ACB8}

/* ---------- 卡片网格 ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;transition:.25s;position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(244,88,28,.4)}
.card .ico{
  width:52px;height:52px;border-radius:13px;background:var(--orange-tint);
  display:grid;place-items:center;font-size:25px;margin-bottom:18px;
}
.card h3{font-size:19px;font-weight:800;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--steel)}
.card .more{display:inline-block;margin-top:14px;font-size:14px;font-weight:700;color:var(--orange)}
.card.dark{background:var(--ink-2);border-color:#3A404B}
.card.dark h3{color:#fff}
.card.dark p{color:#A6ACB8}

/* ---------- 应用市场瓷贴 ---------- */
.app-tile{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;display:flex;flex-direction:column;gap:10px;transition:.25s;
}
.app-tile:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:rgba(244,88,28,.45)}
.app-tile .top{display:flex;align-items:center;gap:12px}
.app-tile .app-ico{
  width:44px;height:44px;border-radius:11px;display:grid;place-items:center;
  font-size:21px;color:#fff;flex:none;
}
.app-tile h4{font-size:16px;font-weight:800}
.app-tile .cat{font-size:12px;color:var(--steel)}
.app-tile p{font-size:13.5px;color:var(--steel)}
.app-tile .foot{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:8px}
.app-tile .install{
  font-size:13px;font-weight:700;color:var(--orange);
  border:1.5px solid var(--orange);padding:5px 14px;border-radius:999px;transition:.2s;
}
.app-tile:hover .install{background:var(--orange);color:#fff}
.app-tile .meta{font-size:12px;color:#9AA1AC}
.ico-c1{background:var(--orange)} .ico-c2{background:#2C6BED} .ico-c3{background:#12A150}
.ico-c4{background:#8B5CF6} .ico-c5{background:#E0483E} .ico-c6{background:#0EA5B7}
.ico-c7{background:#D97706} .ico-c8{background:#475569}

/* ---------- 步骤 ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:step}
.step{position:relative;padding:30px 26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.step h3{font-size:18px;font-weight:800;margin:14px 0 8px}
.step p{font-size:14.5px;color:var(--steel)}

/* ---------- 对比表 ---------- */
.vs{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:15px}
.vs th,.vs td{padding:16px 20px;text-align:left;border-bottom:1px solid var(--line)}
.vs thead th{background:var(--ink);color:#fff;font-size:15px}
.vs thead th.hl-col{background:var(--orange)}
.vs tbody tr:last-child td{border-bottom:none}
.vs td.yes{color:#1B8A3E;font-weight:700}
.vs td.no{color:#B0B6BF}
.vs td.hl-cell{background:var(--orange-tint);font-weight:700}

/* ---------- 功能双栏 ---------- */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;padding:44px 0}
.feature.rev .fig{order:2}
.feature h3{font-size:26px;font-weight:900;margin-bottom:14px}
.feature p{color:var(--steel);font-size:15.5px;margin-bottom:18px}
.feature ul{list-style:none}
.feature li{
  padding:9px 0 9px 32px;position:relative;font-size:15px;font-weight:500;
}
.feature li::before{
  content:"✓";position:absolute;left:0;top:9px;
  width:22px;height:22px;border-radius:7px;background:var(--orange-tint);
  color:var(--orange);font-weight:900;font-size:13px;
  display:grid;place-items:center;
}
.fig{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  box-shadow:var(--shadow);padding:26px;min-height:280px;
  display:flex;flex-direction:column;gap:12px;justify-content:center;
}

/* ---------- Agent 对话演示 ---------- */
.chat{display:flex;flex-direction:column;gap:12px}
.msg{max-width:88%;padding:12px 16px;border-radius:14px;font-size:14px;line-height:1.6}
.msg.user{align-self:flex-end;background:var(--orange);color:#fff;border-bottom-right-radius:4px}
.msg.bot{align-self:flex-start;background:var(--paper);border:1px solid var(--line);border-bottom-left-radius:4px}
.msg.bot b{color:var(--orange)}
.msg .sys{display:block;margin-top:6px;font-size:12px;color:#1B8A3E;font-weight:700}

/* ---------- CTA ---------- */
.cta{
  position:relative;overflow:hidden;text-align:center;
  background:linear-gradient(120deg,var(--orange-deep),var(--orange) 55%,#FF7A3D);
  color:#fff;border-radius:24px;padding:72px 40px;
}
.cta::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.09) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.09) 1px,transparent 1px);
  background-size:44px 44px;
}
.cta>*{position:relative}
.cta h2{color:#fff;font-size:34px}
.cta p{margin:14px auto 30px;max-width:520px;color:rgba(255,255,255,.9);font-size:16.5px}

/* ---------- Footer ---------- */
footer{background:var(--ink);color:#9AA1AC;padding:64px 0 32px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid #2E333D}
.foot-grid h5{color:#fff;font-size:15px;margin-bottom:16px}
.foot-grid a{display:block;padding:5px 0;transition:.2s}
.foot-grid a:hover{color:var(--orange-light)}
.foot-brand p{margin-top:14px;max-width:280px;font-size:13.5px}
.copyright{display:flex;flex-direction:column;justify-content:center;align-items:center;padding-top:26px;font-size:12px;color:#888;gap:10px;text-align:center}
.copyright a{color:#888;transition:.2s}
.copyright a:hover{color:#aaa}
.beian-link{display:inline-flex;align-items:center;gap:6px;color:#888!important;font-size:12px;font-weight:400;line-height:1}
.beian-link img{width:15px;height:16px;flex-shrink:0;display:block}
.beian-link:hover{color:#aaa!important}

/* ---------- 微信二维码 & 留资表单 ---------- */
.qr-img{width:170px;height:auto;display:block;margin:0 auto 10px;border:1px solid var(--line);border-radius:12px}
.lead-wrap{
  max-width:640px;margin:48px auto 0;background:#fff;border:1px solid var(--line);
  border-radius:18px;padding:36px 34px;box-shadow:var(--shadow);
}
.lead-wrap h3{font-size:21px;font-weight:900;text-align:center;margin-bottom:6px}
.lead-wrap .sub{font-size:13.5px;color:var(--steel);text-align:center;margin-bottom:24px}
.lead-form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.lead-form .full{grid-column:1/-1}
.lead-form input,.lead-form select,.lead-form textarea{
  width:100%;padding:13px 14px;border:1.5px solid var(--line);border-radius:10px;
  font-size:15px;font-family:inherit;background:#FFFDFB;transition:.2s;
}
.lead-form input:focus,.lead-form select:focus,.lead-form textarea:focus{
  outline:none;border-color:var(--orange);box-shadow:0 0 0 3px rgba(244,88,28,.12);
}
.lead-form textarea{resize:vertical;min-height:88px}
.lead-form button{
  grid-column:1/-1;padding:15px;border:none;border-radius:10px;cursor:pointer;
  background:var(--orange);color:#fff;font-size:16px;font-weight:800;
  box-shadow:0 6px 20px rgba(244,88,28,.35);transition:.2s;
}
.lead-form button:hover{background:var(--orange-deep)}
.lead-form button:disabled{opacity:.6;cursor:wait}
.lead-ok{text-align:center;font-size:16px;font-weight:700;color:#1B8A3E;padding:30px 0}
.lead-privacy{grid-column:1/-1;font-size:12px;color:#9AA1AC;text-align:center}
.hp{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden}
@media(max-width:640px){.lead-form{grid-template-columns:1fr}}

/* ---------- 移动端汉堡菜单 ---------- */
.menu-btn{
  display:none;width:40px;height:40px;border:1.5px solid var(--line);border-radius:10px;
  background:#fff;font-size:19px;color:var(--ink);cursor:pointer;flex:none;
  align-items:center;justify-content:center;
}
header{position:relative}

/* ---------- 响应式 ---------- */
@media(max-width:960px){
  .hero-grid,.feature,.grid-3,.grid-4,.steps,.foot-grid{grid-template-columns:1fr}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-2{grid-template-columns:1fr}
  .feature.rev .fig{order:0}
  h1{font-size:36px}
  h2{font-size:28px}
  .menu-btn{display:flex}
  .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;z-index:99;
    flex-direction:column;gap:0;background:#fff;
    border-bottom:1px solid var(--line);box-shadow:var(--shadow-lg);
    padding:8px 24px 14px;
  }
  .nav-links a{padding:13px 4px;border-bottom:1px solid var(--line);font-size:16px}
  .nav-links a:last-child{border-bottom:none}
  .nav-links a.active{border-bottom-color:var(--line)}
  header.menu-open .nav-links{display:flex}
  table.vs{display:block;overflow-x:auto;white-space:nowrap}
  .float-chip{display:none}
  .nav{height:60px}
  .logo-img{width:36px;height:36px}
  .logo-name{font-size:19px}
  .nav-cta{gap:8px}
  .nav-cta .btn-ghost{display:none}
  .nav-cta .btn-sm{padding:8px 16px;font-size:13px}
  .hero{padding:56px 0}
  section{padding:60px 0}
  .hero-stats{gap:24px;flex-wrap:wrap}
}