/* ============================================================
   闪光物联管理系统 · 全站样式（浅色科技蓝）
   主色 #2563EB  辅青 #14B8A6  背景 #F8FAFC  文字 #0F172A
   ============================================================ */
:root{
  --blue:#2563EB; --blue-deep:#1D4ED8; --blue-soft:#EFF6FF;
  --teal:#14B8A6; --teal-soft:#ECFDF9;
  --bg:#F8FAFC; --card:#FFFFFF; --line:#E2E8F0;
  --text:#0F172A; --text2:#64748B; --text3:#94A3B8;
  --grad:linear-gradient(135deg,#2563EB 0%,#14B8A6 100%);
  --radius:16px; --shadow:0 4px 20px rgba(15,23,42,.06);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'PingFang SC','Microsoft YaHei','Segoe UI',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* ---------- 顶部导航 ---------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px}
.brand img{width:36px;height:36px}
.brand .b-sub{font-size:11px;color:var(--text2);font-weight:400;display:block;line-height:1.2}
.nav-links{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--text2)}
.nav-links a:hover{color:var(--blue)}
.nav-btn{padding:7px 18px;border-radius:8px;font-size:13px;font-weight:600}
.nav-btn.solid{background:var(--grad);color:#fff}
.nav-btn.ghost{border:1px solid var(--line);color:var(--text)}
.nav-btn.ghost:hover{border-color:var(--blue);color:var(--blue)}
.nav-toggle{display:none;margin-left:auto;background:none;border:none;font-size:22px;color:var(--text);cursor:pointer}
@media(max-width:820px){
  .nav-links{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:14px 20px;gap:14px;border-bottom:1px solid var(--line)}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .nav-btn-login{margin-left:auto}
}

/* ---------- 通用区块 ---------- */
.section{padding:72px 0}
.section.tight{padding:48px 0}
.sec-tag{display:inline-block;font-size:12px;font-weight:600;color:var(--blue);background:var(--blue-soft);border-radius:20px;padding:4px 14px;margin-bottom:14px}
.sec-title{font-size:30px;font-weight:800;letter-spacing:.5px}
.sec-desc{font-size:15px;color:var(--text2);margin-top:10px;max-width:640px}
.sec-head{text-align:center;margin-bottom:44px}
.sec-head .sec-desc{margin-left:auto;margin-right:auto}
@media(max-width:640px){.sec-title{font-size:24px}.section{padding:48px 0}}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:linear-gradient(160deg,#0B1E4B 0%,#123A8C 45%,#0E7490 100%);color:#fff;padding:96px 0 84px}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 80% 20%,rgba(45,212,191,.25),transparent 60%),radial-gradient(500px 260px at 15% 85%,rgba(59,130,246,.3),transparent 60%)}
.hero .container{position:relative;z-index:1;text-align:center}
.hero-logo{width:96px;height:96px;margin:0 auto 20px;filter:drop-shadow(0 8px 24px rgba(45,212,191,.35))}
.hero h1{font-size:44px;font-weight:800;letter-spacing:2px}
.hero .slogan{margin-top:14px;font-size:20px;color:#BFDBFE;letter-spacing:3px}
.hero .intro{margin:26px auto 0;max-width:640px;font-size:15px;color:#DBEAFE;line-height:1.9}
.hero-cta{display:flex;gap:14px;justify-content:center;margin-top:34px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 30px;border-radius:10px;font-size:15px;font-weight:600;cursor:pointer;transition:.2s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 6px 20px rgba(37,99,235,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(37,99,235,.45)}
.btn-light{background:rgba(255,255,255,.12);color:#fff;border:1px solid rgba(255,255,255,.35)}
.btn-light:hover{background:rgba(255,255,255,.2)}
@media(max-width:640px){.hero{padding:64px 0 56px}.hero h1{font-size:30px}.hero .slogan{font-size:16px}}

/* ---------- 信任数字条 ---------- */
.stats{background:#fff;border-bottom:1px solid var(--line)}
.stats-in{display:flex;justify-content:space-around;flex-wrap:wrap;gap:20px;padding:34px 0}
.stat{text-align:center;flex:1 1 140px}
.stat .num{font-size:32px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lab{font-size:13px;color:var(--text2);margin-top:4px}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.card .ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.card h3{font-size:17px;font-weight:700;margin-bottom:8px}
.card p{font-size:14px;color:var(--text2)}
.ico-blue{background:var(--blue-soft)}
.ico-teal{background:var(--teal-soft)}

/* ---------- 案例 ---------- */
.case-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:32px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.case-flow{display:flex;flex-direction:column;gap:0}
.cf-step{display:flex;gap:14px;position:relative;padding-bottom:22px}
.cf-step:last-child{padding-bottom:0}
.cf-step::before{content:"";position:absolute;left:15px;top:34px;bottom:0;width:2px;background:var(--line)}
.cf-step:last-child::before{display:none}
.cf-dot{width:32px;height:32px;flex:0 0 32px;border-radius:50%;background:var(--grad);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center;position:relative;z-index:1}
.cf-body h4{font-size:15px;font-weight:700}
.cf-body p{font-size:13.5px;color:var(--text2);margin-top:4px}
.case-side{background:linear-gradient(160deg,var(--blue-soft),var(--teal-soft));border-radius:14px;padding:28px}
.case-side .k{font-size:12px;color:var(--blue);font-weight:700;letter-spacing:1px}
.case-side h3{font-size:21px;font-weight:800;margin:8px 0 14px;line-height:1.5}
.case-side p{font-size:14px;color:var(--text2)}
.case-side .tagline{margin-top:18px;font-size:14px;font-weight:600;color:var(--blue-deep)}
@media(max-width:820px){.case-wrap{grid-template-columns:1fr;padding:24px}}

/* ---------- 社群愿景 ---------- */
.vision{background:linear-gradient(160deg,#0B1E4B,#123A8C 60%,#0E7490);color:#fff;text-align:center}
.vision .v-quote{font-size:24px;font-weight:700;letter-spacing:2px;line-height:1.8}
.vision .v-sub{margin-top:16px;font-size:14px;color:#BFDBFE}
.vision .v-cta{margin-top:30px}

/* ---------- 动态文章卡 ---------- */
.post{display:flex;gap:20px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;align-items:center;transition:.25s}
.post:hover{box-shadow:var(--shadow)}
.post .p-tag{flex:0 0 auto;font-size:12px;font-weight:700;color:#fff;background:var(--grad);border-radius:6px;padding:3px 10px}
.post h3{font-size:16px;font-weight:700}
.post p{font-size:13.5px;color:var(--text2);margin-top:4px}
.post .p-date{font-size:12px;color:var(--text3);margin-top:6px}

/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.contact-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;text-align:center;transition:.25s}
.contact-card:hover{box-shadow:var(--shadow)}
.contact-card .c-ico{font-size:30px;margin-bottom:12px}
.contact-card h3{font-size:16px;font-weight:700}
.contact-card .c-val{font-size:15px;color:var(--blue);font-weight:600;margin-top:8px}
.contact-card .c-sub{font-size:12.5px;color:var(--text2);margin-top:4px}
.qr-box{margin:12px auto 0;width:180px;height:180px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:12px}
.qr-box img{width:100%;height:100%;object-fit:contain}

/* ---------- 页脚 ---------- */
.footer{background:#0F172A;color:#94A3B8;padding:40px 0 30px;font-size:13px}
.footer .f-in{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;align-items:center}
.footer .brand{color:#fff}
.footer .f-slogan{letter-spacing:1px;color:#64748B}

/* ---------- 子页面通用 ---------- */
.page-hero{background:linear-gradient(160deg,#0B1E4B,#123A8C 60%,#0E7490);color:#fff;padding:60px 0;text-align:center}
.page-hero h1{font-size:32px;font-weight:800;letter-spacing:1px}
.page-hero p{margin-top:10px;color:#BFDBFE;font-size:15px;max-width:640px;margin-left:auto;margin-right:auto}
.crumb{font-size:12px;color:var(--text3);margin-top:14px}
.crumb a{color:var(--blue)}

/* ---------- 登录页 ---------- */
.login-body{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(160deg,#0B1E4B,#123A8C 55%,#0E7490);padding:20px}
.login-card{width:100%;max-width:400px;background:#fff;border-radius:20px;padding:40px 36px;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.login-card .l-logo{width:64px;height:64px;margin:0 auto 14px}
.login-card h1{text-align:center;font-size:20px;font-weight:800}
.login-card .l-sub{text-align:center;font-size:12.5px;color:var(--text2);margin-top:6px}
.field{margin-top:18px}
.field label{display:block;font-size:13px;font-weight:600;color:var(--text);margin-bottom:6px}
.field input{width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:10px;font-size:14px;outline:none;transition:.2s}
.field input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.login-btn{width:100%;margin-top:24px;padding:12px;border:none;border-radius:10px;background:var(--grad);color:#fff;font-size:15px;font-weight:700;cursor:pointer;transition:.2s}
.login-btn:hover{opacity:.9;transform:translateY(-1px)}
.login-err{display:none;margin-top:14px;padding:10px 12px;background:#FEF2F2;border:1px solid #FECACA;color:#B91C1C;font-size:13px;border-radius:8px}
.login-err.show{display:block}
.login-back{display:block;text-align:center;margin-top:18px;font-size:13px;color:var(--text2)}
.login-back a{color:var(--blue)}

/* ---------- 后台页 ---------- */
.console-head{background:#0F172A;color:#fff}
.console-head .c-in{display:flex;align-items:center;gap:12px;height:60px;font-size:14px}
.console-head .c-brand{display:flex;align-items:center;gap:8px;font-weight:700}
.console-head img{width:30px;height:30px}
.console-head .c-right{margin-left:auto;display:flex;align-items:center;gap:14px;font-size:13px;color:#94A3B8}
.console-head .c-right a{color:#BFDBFE}
.kpi{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin:24px 0}
.kpi .card{padding:20px}
.kpi .k-lab{font-size:12.5px;color:var(--text2)}
.kpi .k-val{font-size:26px;font-weight:800;margin-top:6px}
.kpi .k-st{font-size:12px;margin-top:4px}
.ok{color:#059669}.bad{color:#DC2626}.warn{color:#D97706}
.log-box{background:#0F172A;color:#A5F3FC;border-radius:12px;padding:16px;font-family:Consolas,Menlo,monospace;font-size:12.5px;max-height:360px;overflow:auto;line-height:1.8;white-space:pre-wrap;word-break:break-all}
.log-empty{color:#475569}
.ledger-table{width:100%;border-collapse:collapse;font-size:14px}
.ledger-table th,.ledger-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
.ledger-table th{color:var(--text2);font-weight:600;font-size:13px;background:#F8FAFC}
.tbl-actions{margin-top:14px;display:flex;gap:10px;flex-wrap:wrap}
.tbtn{padding:8px 16px;border-radius:8px;font-size:13px;font-weight:600;cursor:pointer;border:none;background:var(--blue-soft);color:var(--blue)}
.tbtn:hover{background:#DBEAFE}