/* ===== 3721 优势科学 · 站点样式 =====
   设计基调：深蓝 + 青绿 + 克制橙
*/
:root{
  --navy:#0E2A47;        /* 主色 深蓝 */
  --navy-2:#16365a;
  --teal:#12A594;        /* 辅色 青绿 */
  --teal-soft:rgba(18,165,148,.10);
  --orange:#F07C1F;      /* 强调 橙（仅焦点） */
  --red:#D92D20;         /* 语义 红（仅冲突/风险） */
  --white:#FFFFFF;
  --gray-bg:#F2F6FA;     /* 浅灰底 */
  --ink:#334155;         /* 正文灰 */
  --ink-2:#64748B;       /* 次要灰 */
  --line:#E2E8F0;
  --shadow:0 6px 22px rgba(14,42,71,.08);
  --r:14px;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB",sans-serif;
  color:var(--ink);background:var(--white);line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.tag{display:inline-block;font-size:13px;letter-spacing:.12em;color:var(--teal);
  border:1px solid var(--teal);border-radius:999px;padding:4px 14px;font-weight:700}
.eyebrow{font-size:13px;letter-spacing:.18em;color:var(--teal);font-weight:700;text-transform:uppercase}

/* ===== 顶部导航 ===== */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--navy);font-size:19px}
.brand img{height:40px;width:auto;display:block;border-radius:8px;flex-shrink:0}
.brand span{white-space:nowrap;line-height:1.2}
.brand .dot{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--navy),var(--teal))}
.nav-links{display:flex;gap:30px;align-items:center}
.nav-links a{color:var(--ink);font-size:15px;font-weight:600}
.nav-links a:hover{color:var(--teal)}
.nav-links a.on{color:var(--teal)}
.nav-toggle{
  display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;
  width:42px;height:42px;padding:0;border:1px solid #fff;border-radius:10px;
  background:#fff;cursor:pointer;flex-shrink:0;
}
.nav-toggle span{
  display:block;width:18px;height:2px;border-radius:1px;background:var(--navy);
  transition:transform .2s,opacity .2s;
}
.nav.is-open .nav-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav.is-open .nav-toggle span:nth-child(2){opacity:0}
.nav.is-open .nav-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.btn{display:inline-block;cursor:pointer;border:none;border-radius:999px;
  padding:11px 24px;font-size:15px;font-weight:700;font-family:inherit;transition:.2s}
.btn-primary{background:var(--orange);color:#fff}
.btn-primary:hover{background:#d96c12}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:var(--navy-2)}
.btn-ghost{background:transparent;color:var(--navy);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal)}
.btn-lg{padding:14px 34px;font-size:17px}

/* ===== Hero ===== */
.hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-2) 55%,#0b2238 100%);
  color:#fff;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-120px;top:-80px;width:480px;height:480px;
  background:radial-gradient(circle,rgba(18,165,148,.30),transparent 70%);border-radius:50%}
.hero-inner{position:relative;z-index:2;padding:88px 24px 76px;max-width:760px}
.hero h1{font-size:46px;line-height:1.22;font-weight:800;margin:18px 0 18px}
.hero h1 .accent{color:var(--teal)}
.hero p.lead{font-size:19px;color:#cdd9e6;margin-bottom:30px;max-width:620px}
.hero .cta{display:flex;gap:16px;flex-wrap:wrap}
.hero .cta .btn-ghost{color:#fff;border-color:rgba(255,255,255,.4)}
.hero .cta .btn-ghost:hover{border-color:var(--teal);color:var(--teal)}
.hero-note{margin-top:26px;font-size:13px;color:#8fa6bd;
  border-left:3px solid var(--teal);padding-left:12px}

/* ===== 信任条 ===== */
.trust{background:var(--navy);color:#fff}
.trust-inner{display:flex;gap:48px;flex-wrap:wrap;padding:22px 0;justify-content:center}
.trust .item{text-align:center;min-width:140px}
.trust .num{font-size:30px;font-weight:800;color:var(--teal)}
.trust .lbl{font-size:13px;color:#a9bcd0;margin-top:2px}

/* ===== 区块 ===== */
.section{padding:74px 0}
.section.alt{background:var(--gray-bg)}
.sec-head{text-align:center;max-width:720px;margin:0 auto 46px}
.sec-head h2{font-size:34px;color:var(--navy);font-weight:800;margin:12px 0 10px}
.sec-head p{color:var(--ink-2);font-size:16px}

/* ===== 卡片网格 ===== */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:30px;
  box-shadow:var(--shadow);transition:.2s}
.card:hover{transform:translateY(-3px);border-color:var(--teal)}
.card .ic{width:46px;height:46px;border-radius:12px;background:var(--teal-soft);
  display:flex;align-items:center;justify-content:center;color:var(--teal);font-size:22px;font-weight:800;margin-bottom:16px}
.card h3{color:var(--navy);font-size:20px;margin-bottom:10px}
.card p{color:var(--ink-2);font-size:15px}
.card .more{display:inline-block;margin-top:16px;color:var(--teal);font-weight:700;font-size:14px}

/* 大工具卡 */
.tool-card{display:flex;gap:26px;align-items:stretch;background:#fff;border:1px solid var(--line);
  border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
.tool-card .vis{flex:0 0 240px;background:linear-gradient(135deg,var(--navy),var(--teal));
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;text-align:center;padding:20px;font-weight:700}
.tool-card .body{flex:1;padding:30px}
.tool-card h3{color:var(--navy);font-size:23px;margin-bottom:8px}
.tool-card .feat{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 20px}
.tool-card .feat span{background:var(--gray-bg);border-radius:999px;padding:6px 14px;font-size:13px;color:var(--ink)}

/* 工具卡两列并排（2026-10-15 定：左右排列，一眼见两大工具） */
.tool-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;align-items:stretch}
.tool-grid .tool-card{flex-direction:column;gap:0}
.tool-grid .tool-card .vis{flex:none;height:118px;font-size:17px;letter-spacing:.04em}
.tool-grid .tool-card .body{padding:26px 30px 30px}
.tool-grid .tool-card h3{font-size:21px}

/* ===== 关于/人物 ===== */
.person{display:flex;gap:40px;align-items:center;flex-wrap:wrap}
.person .photo{flex:0 0 220px;height:260px;border-radius:18px;
  background:linear-gradient(135deg,var(--navy),var(--teal));display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;text-align:center}
.person .bio{flex:1;min-width:300px}
.person .bio h2{color:var(--navy);font-size:30px;margin-bottom:6px}
.person .bio .role{color:var(--teal);font-weight:700;margin-bottom:16px}
.person .bio p{color:var(--ink-2);margin-bottom:12px}

/* ===== 列表/明细 ===== */
.list-row{display:flex;gap:18px;padding:20px 0;border-bottom:1px solid var(--line)}
.list-row:last-child{border-bottom:none}
.list-row .idx{flex:0 0 42px;height:42px;border-radius:10px;background:var(--navy);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800}
.list-row .ct{flex:1}
.list-row .ct h4{color:var(--navy);font-size:18px;margin-bottom:4px}
.list-row .ct p{color:var(--ink-2);font-size:14px}
.flag{display:inline-block;font-size:12px;background:#fff4e8;color:var(--orange);
  border:1px solid #ffd9b0;border-radius:6px;padding:1px 8px;margin-left:8px;font-weight:700}

/* ===== 页脚 ===== */
.foot{background:var(--navy);color:#cdd9e6;padding:54px 0 26px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
.foot h4{color:#fff;font-size:16px;margin-bottom:14px}
.foot a,.foot p{color:#a9bcd0;font-size:14px;line-height:1.9}
.foot .brand{color:#fff;margin-bottom:12px}
.foot .brand img{height:36px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;
  display:flex;justify-content:space-between;font-size:13px;color:#7e93a8;flex-wrap:wrap;gap:8px}
.foot-contact{display:flex;gap:20px;align-items:flex-start}
.qr{width:96px;height:96px;background:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--navy);font-size:12px;text-align:center;margin-top:8px}

/* ===== 赠送页 ===== */
.card .sub-t{font-size:13px;color:var(--teal);font-weight:700;margin:-4px 0 10px}
.get-box{display:flex;gap:34px;align-items:center;margin-top:42px;background:#fff;
  border:1px solid var(--line);border-radius:18px;padding:36px;box-shadow:var(--shadow)}
.get-box .qr{width:150px;height:150px;margin:0;flex-shrink:0;font-size:14px;border:1px dashed var(--line)}
.get-txt h3{color:var(--navy);font-size:22px;margin-bottom:14px}
.get-txt p{color:var(--ink-2);font-size:15px;line-height:1.9}
.get-txt .get-note{font-size:13px;color:var(--ink-2);background:var(--gray-bg);
  border-radius:8px;padding:10px 14px;margin-top:16px}

/* ===== 登录/注册 ===== */
.auth{display:grid;grid-template-columns:1fr 1fr;min-height:100vh}
.auth .left{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;
  padding:60px;display:flex;flex-direction:column;justify-content:center}
.auth .left h2{font-size:34px;margin:16px 0}
.auth .left p{color:#b9c9da;margin-bottom:8px}
.auth .right{display:flex;align-items:center;justify-content:center;padding:40px}
.auth-box{width:380px;max-width:100%}
.auth-box h3{color:var(--navy);font-size:24px;margin-bottom:6px}
.auth-box .sub{color:var(--ink-2);margin-bottom:24px;font-size:14px}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;color:var(--ink);font-weight:600;margin-bottom:6px}
.field input{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit}
.field input:focus{outline:none;border-color:var(--teal)}
.tab{display:flex;gap:8px;margin-bottom:22px}
.tab button{flex:1;padding:10px;border:1px solid var(--line);background:#fff;border-radius:10px;font-weight:700;cursor:pointer;color:var(--ink-2);font-family:inherit}
.tab button.on{background:var(--navy);color:#fff;border-color:var(--navy)}
.note{background:var(--teal-soft);border-radius:10px;padding:14px 16px;font-size:13px;color:var(--navy);margin-top:14px}

/* ===== 用户中心 ===== */
.dash{display:grid;grid-template-columns:220px 1fr;min-height:100vh}
.side{background:var(--navy);color:#cdd9e6;padding:28px 18px}
.side .brand{color:#fff;margin-bottom:26px}
.side .brand img{height:36px}
.auth .left .brand{color:#fff}
.auth .left .brand img{height:42px;margin-bottom:8px}
.side a{display:block;padding:11px 14px;border-radius:10px;color:#cdd9e6;font-size:15px;margin-bottom:4px}
.side a.on,.side a:hover{background:rgba(255,255,255,.10);color:#fff}
.main{padding:34px 40px;background:var(--gray-bg)}
.main h2{color:var(--navy);margin-bottom:6px}
.main .sub{color:var(--ink-2);margin-bottom:26px}
.table{background:#fff;border-radius:12px;box-shadow:var(--shadow);overflow:hidden}
.table .row{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 90px;gap:12px;
  padding:16px 22px;border-bottom:1px solid var(--line);align-items:center;font-size:14px}
.table .row.head{background:var(--gray-bg);font-weight:700;color:var(--navy)}
.table .row .st{font-size:12px;padding:3px 10px;border-radius:999px;background:var(--teal-soft);color:var(--teal);font-weight:700;width:fit-content}
.table .row .dl{color:var(--teal);font-weight:700;cursor:pointer}
.member-wechat{display:flex;gap:18px;align-items:center}

@media(max-width:880px){
  .wrap{padding:0 28px}
  .nav-inner{
    display:flex;flex-wrap:wrap;align-items:center;height:auto;min-height:66px;
    padding:16px 28px;gap:12px 12px;
  }
  .brand{order:1;flex:1;min-width:0;padding:4px 8px 4px 0;font-size:16px;gap:8px}
  .brand img{height:32px}
  .brand span{overflow:hidden;text-overflow:ellipsis;max-width:42vw}
  .nav-inner > .btn-primary{order:2;padding:10px 16px;font-size:13px;white-space:nowrap}
  .nav-toggle{display:inline-flex;order:3}
  .nav-links{
    order:4;display:none;width:100%;flex-direction:column;align-items:stretch;gap:4px;
    padding:14px 0 10px;border-top:1px solid var(--line);margin-top:6px;
  }
  .nav.is-open .nav-links{display:flex}
  .nav-links a{
    padding:14px 16px;font-size:16px;border-radius:10px;border-bottom:none;
  }
  .nav-links a:active,.nav-links a.on{background:var(--gray-bg)}

  /* Hero / 内容区 */
  .hero{padding:0}
  .hero-inner{padding:64px 28px 56px}
  .hero h1{font-size:30px}
  .hero p.lead{font-size:16px;margin-bottom:24px}
  .hero .cta{gap:12px}
  .hero .cta .btn,.hero .cta .btn-lg{width:100%;text-align:center;padding:14px 20px;box-sizing:border-box}
  .section{padding:52px 0}
  .sec-head{margin-bottom:32px}
  .sec-head h2{font-size:26px}
  .card{padding:24px 20px}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .tool-grid{grid-template-columns:1fr}
  .tool-card{flex-direction:column}
  .tool-card .vis{flex:none;height:120px}
  .tool-card .body{padding:22px 20px 24px}
  .trust-inner{gap:22px 28px;padding:20px 0}
  .trust .item{min-width:120px}
  .person{flex-direction:column;align-items:stretch;gap:22px}
  .person .photo{flex:none;width:100%;max-width:280px;height:200px;margin:0 auto}
  .person .bio{min-width:0}
  .list-row{gap:14px;padding:16px 0}
  .list-row .ct h4{font-size:16px}

  /* 页脚 */
  .foot{padding:48px 0 32px}
  .foot-grid{grid-template-columns:1fr;gap:28px}
  .foot .brand{margin-bottom:18px;padding:4px 0}
  .foot .brand img{height:40px;margin-bottom:6px}
  .foot-grid > div > p{line-height:1.85}
  .foot-bottom{
    flex-direction:column;gap:12px;margin-top:28px;padding:20px 28px 8px;
    line-height:1.7;
  }
  .foot-contact{flex-direction:column;gap:18px;align-items:flex-start;padding-top:6px}

  /* 领取 / CTA 条 */
  .get-box{
    flex-direction:column;text-align:center;align-items:stretch;
    padding:24px 22px;gap:20px;margin-top:28px;
  }
  .get-box .btn,.get-box .btn-lg{width:100%;text-align:center;box-sizing:border-box}
  .get-txt h3{font-size:20px}

  /* 登录页：顶栏留 Logo，表单加宽留白 */
  .auth{grid-template-columns:1fr;min-height:100vh}
  .auth .left{
    display:flex;flex-direction:row;align-items:center;justify-content:flex-start;
    padding:20px 28px;min-height:auto;
  }
  .auth .left h2,
  .auth .left p,
  .auth .left img{display:none}
  .auth .left .brand{margin:0;padding:4px 0}
  .auth .left .brand img{height:36px;margin:0}
  .auth .right{padding:28px 28px 40px;align-items:flex-start}
  .auth-box{width:100%;max-width:420px;margin:0 auto}

  /* 用户中心 / 后台：侧栏改顶栏横滑 */
  .dash{grid-template-columns:1fr}
  .side{
    display:flex;flex-direction:row;align-items:center;gap:6px;
    padding:14px 20px;overflow-x:auto;-webkit-overflow-scrolling:touch;
    position:sticky;top:0;z-index:40;border-bottom:1px solid rgba(255,255,255,.08);
  }
  .side .brand{margin:0 10px 0 0;flex-shrink:0;padding:4px 0}
  .side .brand img{height:32px}
  .side .sub{display:none}
  .side a{
    margin:0;padding:9px 13px;font-size:14px;white-space:nowrap;flex-shrink:0;
  }
  .side .back{display:none}
  .main{padding:22px 28px 40px;max-width:100%}
  .table{overflow-x:auto}
  .table .row{
    grid-template-columns:1fr;gap:6px;padding:14px 16px;
  }
  .member-wechat{
    flex-direction:column;gap:16px;align-items:center;text-align:center;
    padding:18px 16px;
  }
}