/* =========================================================
   协会管理系统 · 单页（观达云模板框架风格）
   主色 #165DFF / 辅色 #722ED1 / 强调 #0FC6C2
   纯手写 CSS，离线可用；图标用 Font Awesome CDN
   ========================================================= */

/* ---------- 设计变量 ---------- */
:root{
  --primary:#165DFF;
  --primary-dark:#0E42C8;
  --primary-soft:#F4F6FF;
  --secondary:#722ED1;
  --accent:#0FC6C2;
  --dark:#1D2129;
  --muted:#4E5969;
  --line:#E5E7EB;
  --bg:#F7F8FA;
  --white:#fff;
  --radius:16px;
  --radius-sm:12px;
  --shadow:0 10px 30px -5px rgba(22,93,255,.10);
  --shadow-lg:0 18px 40px -8px rgba(22,93,255,.18);
  --maxw:1200px;
  --header-h:68px;
}

/* ---------- 基础 ---------- */
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--dark);background:var(--white);line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
b,strong{font-weight:700}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* 渐变区块背景 */
.bg-soft{position:relative;background:linear-gradient(135deg,rgba(22,93,255,.05),rgba(114,46,209,.05))}


/* 板块统一间距 */
.section{padding:96px 0}
/* 小标题（观达云风格：主色 + 渐变文字） */
.sec-head{text-align:center;max-width:860px;margin:0 auto 56px}
.sec-head .eyebrow{
  display:inline-block;font-size:13px;letter-spacing:2px;font-weight:700;
  color:var(--primary);background:var(--primary-soft);
  padding:4px 14px;border-radius:999px;margin-bottom:14px;
}
.sec-head h2{
  font-size:clamp(24px,3.4vw,34px);font-weight:800;color:var(--dark);
  background:linear-gradient(90deg,var(--primary),var(--secondary));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.sec-head p{color:var(--muted);margin-top:12px;font-size:15px}

/* ---------- 卡片 ---------- */
.card{
  background:var(--white);border-radius:var(--radius);padding:28px;
  box-shadow:var(--shadow);transition:transform .25s ease,box-shadow .25s ease;
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 30px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;
  border:1px solid transparent;transition:transform .2s,box-shadow .2s,background .2s;white-space:nowrap;
}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),#4080FF);
  color:#fff;box-shadow:0 8px 20px rgba(22,93,255,.30);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(22,93,255,.42)}
.btn-ghost{background:var(--white);color:var(--primary);border-color:var(--primary)}
.btn-ghost:hover{background:var(--primary-soft);transform:translateY(-2px)}
.btn-block{width:100%}

/* =========================================================
   顶部导航
   ========================================================= */
.header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(255,255,255,.9);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);transition:box-shadow .3s;
}
.header.scrolled{box-shadow:0 6px 20px rgba(0,0,0,.06)}
.header__inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.brand img{height:40px;width:auto}
.nav{display:flex;align-items:center;gap:4px}
.nav a{
  padding:9px 14px;border-radius:10px;font-size:15px;font-weight:500;color:var(--dark);
  transition:color .2s,background .2s;
}
.nav a:hover{color:var(--primary);background:var(--primary-soft)}
.nav .nav__cta{
  background:linear-gradient(135deg,var(--primary),#4080FF);color:#fff;font-weight:600;
  box-shadow:0 6px 16px rgba(22,93,255,.28);
}
.nav .nav__cta:hover{color:#fff;background:linear-gradient(135deg,var(--primary-dark),var(--primary))}
.header__right{display:flex;align-items:center;gap:14px}
.header__tel{font-size:13px;color:var(--muted);text-align:right;line-height:1.3}
.header__tel b{display:block;color:var(--primary);font-size:18px}

.nav-toggle{display:none;background:none;border:0;font-size:22px;color:var(--dark);cursor:pointer;padding:6px}

/* 移动端菜单 */
.mobile-menu{
  position:absolute;top:var(--header-h);left:0;right:0;background:#fff;
  border-bottom:1px solid var(--line);display:none;flex-direction:column;padding:10px 20px 18px;
  box-shadow:0 10px 24px rgba(0,0,0,.06);
}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:12px 6px;border-bottom:1px solid var(--line);font-weight:500}
.mobile-menu a:last-child{border-bottom:0}

/* =========================================================
   Hero（Banner 图作背景 + 原文案）
   ========================================================= */
.hero{position:relative;padding-top:calc(var(--header-h) + 40px);padding-bottom:60px;overflow:hidden}
.hero__bg{position:absolute;inset:0;background-size:cover;background-position:center;z-index:0}
.hero__bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(13,30,66,.40),rgba(13,30,66,.14) 55%,rgba(13,30,66,.03));
}
.hero__inner{position:relative;z-index:1;color:#fff}
.hero h1{font-size:clamp(28px,5vw,46px);font-weight:800;margin-bottom:18px}
.hero h1 b{color:#FFD66B}
.hero p{font-size:clamp(14px,1.6vw,17px);line-height:1.9;max-width:760px;color:#eaf1ff}
.hero p b{color:#7FD8FF}
.hero__actions{margin-top:24px;display:flex;gap:14px;flex-wrap:wrap}
.hero__note{
  margin-top:22px;display:inline-block;font-size:14px;color:#eaf1ff;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);
  border-radius:12px;padding:12px 16px;max-width:760px;
}

/* =========================================================
   优惠套餐
   ========================================================= */
.combo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.plan{
  position:relative;display:flex;flex-direction:column;text-align:center;
  border:1px solid var(--line);
}
.plan--hot{border:2px solid var(--primary);box-shadow:var(--shadow-lg)}
.plan__badge{
  position:absolute;top:-14px;left:50%;transform:translateX(-50%);
  background:linear-gradient(135deg,var(--primary),#4080FF);color:#fff;
  font-size:12px;font-weight:700;padding:5px 16px;border-radius:999px;box-shadow:0 6px 14px rgba(22,93,255,.35);
}
.plan h3{font-size:22px;font-weight:800;color:var(--dark)}
.plan__set{font-size:13px;color:var(--muted);margin:10px 0 14px}
.plan__count{font-size:36px;font-weight:800;color:var(--primary);margin-bottom:14px}
.plan__feats{flex:1;display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.plan__feats li{
  background:var(--bg);border-radius:10px;padding:8px 10px;font-size:14px;color:#445;
}
.plan__feats .plus{background:var(--primary-soft);color:var(--primary);font-weight:700}

/* =========================================================
   Why
   ========================================================= */
.why-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}
.why-figure{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.why-figure img{width:100%;height:auto}
.why-text .label{
  display:inline-block;font-size:13px;letter-spacing:2px;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--primary),var(--secondary));
  padding:4px 14px;border-radius:999px;margin-bottom:12px;
}
.why-text h2{font-size:clamp(22px,3.4vw,32px);font-weight:800;color:var(--dark);margin-bottom:18px}
.why-cta{margin-top:22px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.why-cta .tel{font-size:17px;color:var(--muted)}
.why-cta .tel b{color:var(--primary);font-size:20px}

/* =========================================================
   六大功能
   ========================================================= */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feat{display:flex;flex-direction:column;overflow:hidden;padding:0}
.feat__img{height:200px;overflow:hidden}
.feat__img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.feat:hover .feat__img img{transform:scale(1.06)}
.feat__body{padding:22px 24px 26px}
.feat__body h3{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:10px;display:flex;align-items:center;gap:10px}
.feat__body h3 i{color:var(--primary)}
.feat__body p{font-size:14px;color:var(--muted);line-height:1.85}

/* =========================================================
   八大优势
   ========================================================= */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.adv{text-align:center}
.adv__icon{
  width:56px;height:56px;border-radius:16px;margin:0 auto 14px;
  display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;
  background:linear-gradient(135deg,var(--primary),#4080FF);box-shadow:0 8px 18px rgba(22,93,255,.25);
}
.adv h3{font-size:17px;font-weight:700;margin-bottom:8px;color:var(--dark)}
.adv p{font-size:13.5px;color:var(--muted);line-height:1.8}

/* =========================================================
   案例展示
   ========================================================= */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.case-item{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.case-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.case-item img{width:100%;height:230px;object-fit:cover}
.case-cta{text-align:center;margin-top:36px;display:flex;flex-direction:column;align-items:center;gap:14px}
.case-cta .tel{font-size:22px;font-weight:800;color:var(--primary)}

/* =========================================================
   页脚
   ========================================================= */
.footer{background:#1D2330;color:#AEB8C7;padding:40px 0 30px}
.footer__inner{display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center}
.footer__nav{display:flex;flex-wrap:wrap;gap:8px 22px;justify-content:center}
.footer__nav a{color:#AEB8C7;font-size:14px;transition:color .2s}
.footer__nav a:hover{color:#7FD8FF}
.footer__hot b{color:#fff;font-size:18px}
.footer__copy{font-size:13px;color:#7F8A9A}

/* =========================================================
   侧栏悬浮工具
   ========================================================= */
.im{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:55;display:flex;flex-direction:column;gap:12px;align-items:center}
.im__btn{
  width:60px;display:flex;flex-direction:column;align-items:center;gap:3px;
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:9px 4px;
  font-size:12px;color:var(--muted);cursor:pointer;box-shadow:var(--shadow);transition:.2s;
}
.im__btn img{width:24px;height:24px;object-fit:contain}
.im__btn:hover{color:var(--primary);border-color:var(--primary);transform:translateY(-2px)}
.im__wx-pop{
  position:absolute;right:72px;top:50%;transform:translateY(-50%);
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;text-align:center;
  box-shadow:var(--shadow-lg);width:160px;
}
.im__wx-pop p{font-size:13px;margin:3px 0}
.im__wx-pop .wx-id{color:var(--primary);font-weight:700}
.im__wx-pop img{width:120px;height:120px;object-fit:cover;margin:8px auto;border-radius:8px;border:1px solid var(--line)}
.im__wx-pop .tip{color:var(--muted);font-size:12px;line-height:1.5}
.im__top{
  width:60px;height:44px;border:1px solid var(--line);border-radius:14px;background:#fff;
  font-size:20px;color:var(--primary);cursor:pointer;box-shadow:var(--shadow);transition:.2s;
}
.im__top:hover{background:var(--primary-soft)}

/* 移动端底部条 */
.mobile-bar{display:none}
.mobile-bar a{flex:1;text-align:center;padding:13px 0;font-weight:700;font-size:15px}
.mobile-bar__tel{background:#fff;color:var(--primary);border-top:1px solid var(--line)}
.mobile-bar__qq{background:linear-gradient(135deg,var(--primary),#4080FF);color:#fff}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1024px){
  .im{display:none}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .case-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
  .nav{display:none}
  .nav-toggle{display:block}
  .header__tel{display:none}
  .why-grid{grid-template-columns:1fr}
  .combo-grid{grid-template-columns:1fr;max-width:460px;margin:0 auto}
  .hero__bg::after{background:linear-gradient(180deg,rgba(13,30,66,.46),rgba(13,30,66,.24))}
  .hero{padding-bottom:64px}
  .section{padding:64px 0}

  .mobile-bar{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:60}
  body{padding-bottom:54px}

  .sec-head{margin-bottom:34px}
}
@media (max-width:480px){
  .container{padding:0 16px}
  .brand img{height:34px}
  .feat-grid,.adv-grid,.case-grid{grid-template-columns:1fr}
  .case-item img{height:200px}
  .hero h1{font-size:26px}
}