/* =========================================================
   官网样式
   ========================================================= */

:root{
  --ink:#0b1220;
  --ink-2:#26324a;
  --muted:#5d6b85;
  --muted-2:#8394ad;
  --line:#e4eaf3;
  --line-2:#eef2f8;
  --bg:#ffffff;
  --bg-soft:#f5f8fd;

  --primary:#2563eb;
  --primary-d:#1a4fd0;
  --primary-l:#eaf1ff;
  --cyan:#06b6d4;
  --violet:#7c3aed;
  --green:#20b77a;

  --radius:16px;
  --radius-lg:22px;
  --shadow-sm:0 1px 2px rgba(16,32,64,.05), 0 4px 14px rgba(16,32,64,.05);
  --shadow:0 10px 30px rgba(16,32,64,.08);
  --shadow-lg:0 24px 60px rgba(9,22,54,.16);
  --ease:cubic-bezier(.22,.61,.36,1);

  --header-h:70px;
}

*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }

/* 固定顶栏会遮住锚点目标，这里留出偏移 */
section[id]{ scroll-margin-top:calc(var(--header-h) + 18px); }
#top{ scroll-margin-top:0; }

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",sans-serif;
  font-size:16px;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4{ margin:0; line-height:1.28; letter-spacing:-.01em; font-weight:700; }
p{ margin:0; }
a{ color:inherit; text-decoration:none; }
ul,ol,dl,dd,dt{ margin:0; padding:0; list-style:none; }
img,svg{ display:block; max-width:100%; }
button,input,select,textarea{ font:inherit; color:inherit; }

::selection{ background:var(--primary); color:#fff; }

.wrap{ width:100%; max-width:1200px; margin:0 auto; padding:0 24px; }

.ic{ width:1em; height:1em; flex:none; stroke:currentColor; fill:none;
     stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.5em;
  padding:.72em 1.35em; border-radius:11px; border:1px solid transparent;
  font-size:.94rem; font-weight:600; cursor:pointer; white-space:nowrap;
  transition:transform .18s var(--ease), box-shadow .22s var(--ease),
             background-color .2s, border-color .2s, color .2s;
}
.btn .ic{ font-size:1.05em; transition:transform .22s var(--ease); }
.btn:hover .ic{ transform:translateX(3px); }
.btn:active{ transform:translateY(1px) scale(.99); }

.btn-primary{ background:var(--primary); color:#fff; box-shadow:0 8px 20px rgba(37,99,235,.28); }
.btn-primary:hover{ background:var(--primary-d); box-shadow:0 12px 26px rgba(37,99,235,.34); }

.btn-lg{ padding:.9em 1.7em; font-size:1rem; border-radius:13px; }

/* ---------------- 顶栏 ---------------- */
.site-header{
  position:sticky; top:0; z-index:80;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
/* 页面不放品牌标识，导航居中作为唯一内容 */
.nav-inner{
  position:relative; display:flex; align-items:center; justify-content:center;
  height:var(--header-h);
}

.nav-links{ display:flex; align-items:center; gap:4px; }
.nav-links a{
  position:relative; padding:.5em .9em; border-radius:9px;
  font-size:.95rem; font-weight:500; color:var(--ink-2);
  transition:color .2s, background-color .2s;
}
.nav-links a:hover{ color:var(--primary); background:var(--primary-l); }
.nav-links a.is-current{ color:var(--primary); font-weight:600; }
.nav-links a.is-current::after{
  content:""; position:absolute; left:.9em; right:.9em; bottom:.1em;
  height:2px; border-radius:2px; background:var(--primary);
}

/* 桌面端没有右侧操作区；移动端才显示菜单按钮 */
.nav-actions{ display:none; align-items:center; gap:8px; }
.nav-toggle{
  display:none; width:42px; height:42px; border:1px solid var(--line);
  background:#fff; border-radius:11px; cursor:pointer;
  flex-direction:column; align-items:center; justify-content:center; gap:5px;
}
.nav-toggle span{ width:18px; height:2px; border-radius:2px; background:var(--ink-2);
  transition:transform .25s var(--ease), opacity .2s; }
.nav-toggle.is-open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2){ opacity:0; }
.nav-toggle.is-open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* ---------------- 通用区块 ---------------- */
.section{ padding:88px 0; position:relative; }
.section-first{ padding-top:64px; }
.section-soft{ background:var(--bg-soft); }
.section-soft::before,.section-soft::after{
  content:""; position:absolute; left:0; right:0; height:1px; background:var(--line-2);
}
.section-soft::before{ top:0; } .section-soft::after{ bottom:0; }

.sec-head{ max-width:720px; margin-bottom:44px; }
.sec-head h2{ font-size:clamp(1.6rem,2.9vw,2.3rem); margin-top:14px; }
.sec-head p{ margin-top:16px; color:var(--muted); font-size:1.02rem; }

.sec-label{
  display:inline-block; font-size:.72rem; font-weight:700; letter-spacing:.2em;
  color:var(--primary); background:var(--primary-l);
  padding:.36em .9em; border-radius:7px;
}

/* ---------------- 卡片网格 ---------------- */
.grid{ display:grid; gap:20px; }
.grid-4{ grid-template-columns:repeat(4,1fr); }

.card{
  position:relative; background:#fff; border:1px solid var(--line);
  border-radius:var(--radius); padding:26px 24px;
  transition:transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s;
}
.card:hover{ transform:translateY(-5px); box-shadow:var(--shadow-lg); border-color:#cfdefa; }

.badge{
  position:absolute; top:-1px; right:18px; z-index:1;
  padding:.22em .8em; border-radius:0 0 8px 8px;
  font-size:.72rem; font-weight:700; color:#fff;
  background:linear-gradient(120deg,var(--primary),var(--cyan));
  box-shadow:0 4px 12px rgba(37,99,235,.3);
}

.service{ display:flex; flex-direction:column; }
.service.hide{ display:none; }

.card-ic{
  width:46px; height:46px; border-radius:13px; display:grid; place-items:center;
  background:linear-gradient(145deg,#eef4ff,#e2edff);
  color:var(--primary); font-size:1.35rem; margin-bottom:18px;
  border:1px solid #dbe7fd;
  transition:transform .3s var(--ease), background .3s, color .3s, border-color .3s;
}
.service:hover .card-ic{
  transform:rotate(-6deg) scale(1.06);
  background:linear-gradient(145deg,var(--primary),#4f8bff); color:#fff; border-color:transparent;
}
.service h3{ font-size:1.1rem; }
.service p{ margin-top:10px; color:var(--muted); font-size:.92rem; line-height:1.72; }

.ticks{ margin-top:16px; display:grid; gap:8px; }
.ticks li{ position:relative; padding-left:22px; font-size:.88rem; color:var(--ink-2); }
.ticks li::before{
  content:""; position:absolute; left:0; top:.52em;
  width:12px; height:7px; border-left:2px solid var(--primary); border-bottom:2px solid var(--primary);
  transform:rotate(-45deg); border-radius:1px;
}

/* 筛选 */
.filter{ display:flex; flex-wrap:wrap; gap:10px; margin-bottom:32px; }
.chip{
  padding:.5em 1.15em; border-radius:999px; border:1px solid var(--line);
  background:#fff; color:var(--muted); font-size:.9rem; font-weight:500; cursor:pointer;
  transition:all .22s var(--ease);
}
.chip:hover{ border-color:#c9d8f5; color:var(--primary); }
.chip.is-active{
  background:var(--ink); border-color:var(--ink); color:#fff; font-weight:600;
  box-shadow:0 8px 18px rgba(11,18,32,.18);
}

/* ---------------- 流程 ---------------- */
.steps{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.steps li{
  position:relative; background:#fff; border:1px solid var(--line);
  border-radius:var(--radius); padding:30px 26px 26px;
  transition:transform .28s var(--ease), box-shadow .28s var(--ease);
  overflow:hidden;
}
.steps li::after{
  content:""; position:absolute; left:0; top:0; bottom:0; width:3px;
  background:linear-gradient(180deg,var(--primary),var(--cyan));
  transform:scaleY(0); transform-origin:top; transition:transform .35s var(--ease);
}
.steps li:hover{ transform:translateY(-4px); box-shadow:var(--shadow); }
.steps li:hover::after{ transform:scaleY(1); }
.step-no{
  font-size:.82rem; font-weight:800; letter-spacing:.1em; color:var(--primary);
  background:var(--primary-l); padding:.2em .6em; border-radius:6px;
}
.steps h3{ font-size:1.05rem; margin-top:14px; }
.steps p{ margin-top:9px; color:var(--muted); font-size:.9rem; line-height:1.72; }

/* ---------------- 演示案例 ---------------- */
.grid-2{ grid-template-columns:repeat(2,1fr); }
.demo-grid{ align-items:stretch; }

.demo-card{
  position:relative; display:flex; flex-direction:column;
  background:#fff; border:1px solid var(--line); border-radius:var(--radius-lg);
  padding:32px 30px 28px; overflow:hidden;
  transition:transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s;
}
/* 顶部色条：两端各用一套主色，便于一眼区分 */
.demo-card::before{
  content:""; position:absolute; inset:0 0 auto 0; height:4px;
  background:linear-gradient(90deg,var(--primary),var(--cyan));
}
.demo-card.is-app::before{ background:linear-gradient(90deg,#20b77a,#7fdcc0); }
.demo-card:hover{ transform:translateY(-5px); box-shadow:var(--shadow-lg); border-color:#cfdefa; }

.case-tag{
  display:inline-block; align-self:flex-start;
  font-size:.74rem; font-weight:700; letter-spacing:.04em;
  color:var(--violet); background:#f3edff; border:1px solid #e6dbff;
  padding:.28em .75em; border-radius:7px;
}
.case-tag.teal{ color:#0f8a5f; background:#e7f8f1; border-color:#c9eede; }

.demo-card h3{ font-size:clamp(1.15rem,1.7vw,1.35rem); margin-top:16px; }
.demo-desc{ margin-top:12px; color:var(--muted); font-size:.93rem; line-height:1.8; }

.demo-points{ margin-top:20px; display:grid; gap:10px; }
.demo-points li{
  position:relative; padding-left:26px; font-size:.9rem; color:var(--ink-2); line-height:1.68;
}
.demo-points li::before{
  content:""; position:absolute; left:0; top:.42em;
  width:14px; height:8px; border-left:2px solid var(--primary); border-bottom:2px solid var(--primary);
  transform:rotate(-45deg); border-radius:1px;
}
.demo-card.is-app .demo-points li::before{ border-color:#20b77a; }

.demo-mods{ display:flex; flex-wrap:wrap; gap:7px; margin-top:20px; }
.demo-mods span{
  font-size:.78rem; color:var(--muted);
  background:var(--bg-soft); border:1px solid var(--line);
  padding:.3em .7em; border-radius:7px;
}

.demo-actions{
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
  margin-top:auto; padding-top:26px;
}
.demo-hint{ font-size:.82rem; color:var(--muted-2); line-height:1.6; }

.demo-note{ margin-top:22px; font-size:.82rem; color:var(--muted-2); }

/* ---------------- 页脚（ICP 备案） ---------------- */
.site-footer{
  border-top:1px solid var(--line);
  background:var(--bg);
  padding:24px 0;
}
.footer-inner{ display:flex; align-items:center; justify-content:center; }
.icp{ font-size:.82rem; color:var(--muted-2); transition:color .2s; }
.icp:hover{ color:var(--primary); }

/* ---------------- 滚动动画 ----------------
   translate 与 transform 是两个独立属性，这里用 translate 做入场位移，
   避免和卡片 hover 的 transform 互相覆盖；未启用 JS 时内容默认可见。 */
.js .reveal{
  opacity:0; translate:0 22px;
  transition:opacity .7s var(--ease), translate .7s var(--ease);
}
.js .reveal.in{ opacity:1; translate:0 0; }

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *{ animation:none !important; transition-duration:.01ms !important; }
  .js .reveal{ opacity:1; translate:none; }
}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1080px){
  .grid-4{ grid-template-columns:repeat(2,1fr); }
  .grid-2{ grid-template-columns:1fr; }
}

@media (max-width:900px){
  /* 导航收进下拉面板后，把菜单按钮推到右侧 */
  .nav-inner{ justify-content:flex-end; }
  .nav-actions{ display:flex; }

  .nav-links{
    position:fixed; left:0; right:0; top:var(--header-h);
    flex-direction:column; align-items:stretch; gap:2px;
    padding:14px 20px 22px; background:#fff;
    border-bottom:1px solid var(--line); box-shadow:0 20px 40px rgba(16,32,64,.12);
    transform:translateY(-120%);
    /* 收起时彻底不渲染，否则面板阴影会压在顶栏上 */
    visibility:hidden;
    transition:transform .32s var(--ease), visibility .32s linear;
  }
  .nav-links.is-open{ transform:translateY(0); visibility:visible; }
  .nav-links a{ padding:.85em 1em; font-size:1rem; }
  .nav-links a.is-current::after{ display:none; }
  .nav-toggle{ display:flex; }

  .steps{ grid-template-columns:repeat(2,1fr); }
}

@media (max-width:720px){
  .wrap{ padding:0 18px; }
  .section{ padding:60px 0; }
  .section-first{ padding-top:44px; }
  .grid-4,.steps{ grid-template-columns:1fr; }
  .sec-head{ margin-bottom:32px; }
  .demo-card{ padding:26px 20px 22px; }
  .demo-actions{ gap:12px; }
}