:root{
  --bg:#f5f6f8; --card:#ffffff; --ink:#1c2330; --muted:#6b7482;
  --line:#e5e8ee; --brand:#2f5af0; --brand-deep:#1d3fa8; --brand-weak:#eaf0ff;
  --green:#0f9d6c; --green-weak:#e6f7f0; --amber:#c07c0a; --amber-weak:#fdf3e0;
  --red:#d5484a; --radius:12px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--ink);font-size:14px;line-height:1.65}
a{text-decoration:none;color:inherit}
.container{max-width:1080px;margin:0 auto;padding:0 20px}

/* ===== 导航 ===== */
.nav{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.nav-in{display:flex;align-items:center;gap:8px;height:60px}
.brand{font-size:18px;font-weight:700;color:var(--brand);margin-right:18px}
.brand small{font-weight:400;color:var(--muted);font-size:12px;margin-left:6px}
.nav a.item{padding:8px 14px;border-radius:8px;color:var(--muted);font-size:14px}
.nav a.item:hover{color:var(--ink)}
.nav a.item.active{background:var(--brand-weak);color:var(--brand);font-weight:600}
.nav .cta{margin-left:auto}

/* ===== 按钮 ===== */
.btn{display:inline-block;padding:10px 22px;border-radius:9px;border:none;background:var(--brand);color:#fff;cursor:pointer;font-size:14px;font-family:inherit}
.btn:hover{opacity:.9}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn.green{background:var(--green)}
.btn.big{padding:13px 30px;font-size:15px}
.btn:disabled{background:#c3c8d2;cursor:not-allowed}

/* ===== 首页 Hero ===== */
.hero{background:linear-gradient(180deg,#fff 0%,var(--bg) 100%);padding:72px 0 56px;text-align:center}
.hero h1{font-size:34px;line-height:1.3;margin-bottom:14px}
.hero h1 em{font-style:normal;color:var(--brand)}
.hero p{color:var(--muted);font-size:16px;max-width:560px;margin:0 auto 26px}
.hero .btns{display:flex;gap:12px;justify-content:center}

.section{padding:52px 0}
.section h2{font-size:22px;text-align:center;margin-bottom:6px}
.section .sub{color:var(--muted);text-align:center;margin-bottom:32px;font-size:14px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;transition:border-color .15s}
.card.clickable{cursor:pointer}
.card.clickable:hover{border-color:var(--brand)}
.card h3{font-size:15px;margin-bottom:8px}
.feat .ic{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px;margin-bottom:10px;background:var(--brand-weak)}
.feat p{color:var(--muted);font-size:13px}

.steps{display:flex;gap:14px;max-width:840px;margin:0 auto}
.step{flex:1;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-align:center}
.step .no{display:inline-flex;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;align-items:center;justify-content:center;font-weight:600;margin-bottom:10px}
.step b{display:block;margin-bottom:4px;font-size:14px}
.step span{color:var(--muted);font-size:12.5px}

/* ===== 角色卡 ===== */
.role{padding:26px;border-radius:var(--radius);text-align:left}
.role.client{background:var(--brand-weak);border:1px solid #cdd9ff}
.role.vendor{background:var(--green-weak);border:1px solid #bfe8d8}
.role h3{font-size:16px;margin-bottom:10px}
.role ul{list-style:none;margin:12px 0 18px}
.role li{padding:5px 0 5px 22px;position:relative;color:var(--muted);font-size:13.5px}
.role li::before{content:"";position:absolute;left:0;top:12px;width:12px;height:12px;border-radius:50%;background:var(--brand)}
.role.vendor li::before{background:var(--green)}

/* ===== 计算器 ===== */
.calc{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px;max-width:680px;margin:0 auto}
.calc .row{margin-bottom:18px}
.calc label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.calc output{font-weight:700;color:var(--brand)}
.calc input[type=range]{width:100%;accent-color:var(--brand)}
.result{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:6px}
.result .box{border-radius:10px;padding:14px;text-align:center}
.box.p{background:var(--brand-weak)}.box.g{background:var(--green-weak)}.box.a{background:var(--amber-weak)}
.box b{display:block;font-size:20px}
.box span{font-size:12px;color:var(--muted)}
.netline{margin-top:14px;color:var(--muted);font-size:13.5px;text-align:center}
.netline b{color:var(--ink)}
.compliance{background:var(--amber-weak);border:1px solid #f0dcb4;border-radius:8px;padding:10px 14px;font-size:13px;color:var(--amber);margin-top:16px}

/* ===== 页面标题 ===== */
.page-head{padding:36px 0 8px}
.page-head h1{font-size:24px;margin-bottom:4px}
.page-head p{color:var(--muted);font-size:14px}

/* ===== 需求卡片 ===== */
.demand-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px;padding:18px 0 60px}
.d-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px;cursor:pointer;transition:border-color .15s}
.d-card:hover{border-color:var(--brand)}
.d-card h3{font-size:15px;margin-bottom:8px}
.meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.tag{font-size:12px;padding:2px 10px;border-radius:20px;background:var(--brand-weak);color:var(--brand)}
.tag.gray{background:#f0f1f4;color:var(--muted)}
.tag.green{background:var(--green-weak);color:var(--green)}
.tag.amber{background:var(--amber-weak);color:var(--amber)}
.d-card .desc{color:var(--muted);font-size:13px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.d-card .foot{display:flex;justify-content:space-between;margin-top:10px;font-size:12px;color:var(--muted)}

/* ===== 表单 ===== */
.form-wrap{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;max-width:580px;margin:18px 0 60px}
.form-wrap .row{margin-bottom:16px}
label{display:block;font-size:13px;color:var(--muted);margin-bottom:5px}
input,select,textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-family:inherit;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand)}
textarea{resize:vertical;min-height:90px}
.hint{background:var(--amber-weak);border:1px solid #f0dcb4;border-radius:8px;padding:10px 14px;font-size:13px;color:var(--amber);margin:14px 0}

/* ===== 弹窗 / 提示 ===== */
.modal-mask{position:fixed;inset:0;background:rgba(20,25,35,.45);display:none;align-items:center;justify-content:center;z-index:50;padding:20px}
.modal-mask.show{display:flex}
.modal{background:#fff;border-radius:14px;max-width:640px;width:100%;max-height:85vh;overflow:auto;padding:26px}
.quote{border:1px solid var(--line);border-radius:10px;padding:14px;margin-top:10px;display:flex;align-items:center;gap:12px}
.quote .info{flex:1}
.quote .price{font-size:17px;font-weight:700;color:var(--brand)}
.quote .rebate{font-size:12px;color:var(--green)}
.star{color:var(--amber)}
.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#232a38;color:#fff;padding:12px 22px;border-radius:10px;font-size:14px;display:none;z-index:99;max-width:90vw}
.unlock{font-size:13px;color:var(--muted);background:#f6f7f9;border-radius:8px;padding:10px 12px;margin-top:8px}

/* ===== 页脚 ===== */
footer{background:#1c2330;color:#9aa3b2;padding:34px 0;font-size:13px}
footer .cols{display:flex;gap:40px;flex-wrap:wrap}
footer b{color:#fff;display:block;margin-bottom:8px;font-size:14px}
footer .copy{margin-top:26px;padding-top:16px;border-top:1px solid #2d3546;font-size:12px}

/* ===== 移动端适配 ===== */
.nav-in{position:relative}
.burger{display:none}
@media(max-width:860px){
  .burger{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;font-size:17px;cursor:pointer;margin-left:auto;color:var(--ink)}
  .menu{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:12px 20px 16px;box-shadow:0 8px 20px rgba(20,25,35,.06);z-index:30}
  .menu.open{display:flex}
  .menu .item{padding:11px 12px}
  .menu .cta{margin:8px 0 0;text-align:center}
  .hero{padding:48px 0 40px}
  .hero h1{font-size:26px}
  .steps{flex-direction:column}
  .grid[style*="grid-template-columns"]{grid-template-columns:1fr !important}
  .result{grid-template-columns:1fr;gap:8px}
  .role{margin-bottom:0}
}

/* ===== 法务页面 ===== */
.legal h2{font-size:16px;margin:22px 0 10px;padding-top:16px;border-top:1px dashed var(--line)}
.legal h2:first-of-type{border-top:none;padding-top:0;margin-top:4px}
.legal p{color:var(--muted);font-size:13.5px;margin-bottom:9px}
.legal b{color:var(--ink)}

@media(max-width:720px){
  .hero h1{font-size:24px}
  .nav a.item{padding:8px 10px;font-size:13px}
}

/* ===== 后台管理 ===== */
.admin-nav .nav-in{height:auto;min-height:60px;flex-wrap:wrap;padding-top:8px;padding-bottom:8px}
.badge{background:var(--red);color:#fff;border-radius:10px;font-size:11px;padding:1px 7px;margin-left:4px}
.badge:empty{display:none}
.admin-tabs{display:flex;gap:8px;margin:16px 0 20px;flex-wrap:wrap}
.admin-tabs .atab{padding:9px 18px;border-radius:8px;border:1px solid var(--line);background:#fff;color:var(--muted);cursor:pointer;font-size:13.5px;font-family:inherit}
.admin-tabs .atab.active{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:12px;margin-bottom:22px}
.stat{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px;text-align:center}
.stat b{display:block;font-size:20px;margin-bottom:2px}
.stat span{font-size:12px;color:var(--muted)}
.stat.ok b{color:var(--green)}
.stat.warn b{color:var(--red)}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:20px}
.panel h3{font-size:15px;margin-bottom:4px}
.panel .muted{color:var(--muted);font-size:12.5px;margin-bottom:14px}
.atable{width:100%;border-collapse:collapse;font-size:13px;margin-top:10px}
.atable th{background:#f6f7f9;text-align:left;padding:9px 10px;font-weight:600;border-bottom:1px solid var(--line);white-space:nowrap}
.atable td{padding:10px;border-bottom:1px solid var(--line);vertical-align:top}
.atable tr:last-child td{border-bottom:none}
.muted{color:var(--muted)}
.small{font-size:12px}
.tag.red{background:#fdeaea;color:var(--red)}
.ops{white-space:nowrap}
.mini{padding:4px 10px;border-radius:6px;border:1px solid var(--line);background:#fff;font-size:12px;cursor:pointer;font-family:inherit;margin:2px 0}
.mini:hover{border-color:var(--brand);color:var(--brand)}
.mini.green{background:var(--green-weak);border-color:#bfe8d8;color:var(--green)}
.mini.red{background:#fdeaea;border-color:#f2c8c9;color:var(--red)}
.setrow{display:flex;align-items:center;gap:14px;margin-bottom:12px}
.setrow label{margin:0;width:280px;flex-shrink:0}
.setrow input{width:140px}
@media(max-width:720px){
  .atable{display:block;overflow-x:auto;white-space:nowrap}
  .setrow{flex-direction:column;align-items:flex-start;gap:4px}
}