/* =========================================================
   雷米高官网 - 设计系统
   视觉规范：主渐变 #3A82F4 -> #8C5BF4 (135deg)
   ========================================================= */
:root{
  --brand1:#3A82F4;
  --brand2:#8C5BF4;
  --grad:linear-gradient(135deg,#3A82F4,#8C5BF4);
  --grad-soft:linear-gradient(135deg,#EEF3FF,#F6F1FF);
  --ink:#1F2937;
  --ink-2:#374151;
  --muted:#6B7280;
  --line:#E5E7EB;
  --soft:#F8FAFC;
  --white:#fff;
  --ok:#0FBA82;
  --warn:#EF4444;
  --radius:14px;
  --radius-lg:20px;
  --shadow:0 4px 20px rgba(58,130,244,.08);
  --shadow-lg:0 12px 40px rgba(58,130,244,.14);
  --maxw:1200px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  color:var(--ink);
  background:var(--white);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{margin:0;padding-left:1.2em}
h1,h2,h3,h4{line-height:1.3;margin:0 0 .5em;color:var(--ink)}
p{margin:0 0 1em}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 24px;border-radius:10px;border:1px solid transparent;
  font-size:15px;font-weight:600;cursor:pointer;transition:.2s;
  font-family:inherit;
}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 4px 14px rgba(58,130,244,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 22px rgba(58,130,244,.34)}
.btn-ghost{background:#fff;color:var(--brand1);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand1);background:#F5F8FF}
.btn-sm{padding:8px 16px;font-size:14px;border-radius:8px}

/* ---------- 顶部导航 ---------- */
.nav{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);
  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;font-size:18px;letter-spacing:.2px}
.brand .logo{
  width:34px;height:34px;border-radius:9px;background:var(--grad);
  display:grid;place-items:center;color:#fff;font-weight:900;font-size:15px;
  box-shadow:0 4px 12px rgba(58,130,244,.3);
}
.brand span.sub{font-size:11px;font-weight:600;color:var(--muted);letter-spacing:1px;display:block;line-height:1}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  padding:8px 14px;border-radius:8px;font-size:15px;color:var(--ink-2);
  font-weight:500;transition:.15s;
}
.nav-links a:hover{background:var(--soft);color:var(--brand1)}
.nav-links a.active{color:var(--brand1);background:#F0F5FF;font-weight:600}
.nav-toggle{
  display:none;width:40px;height:40px;border:1px solid var(--line);background:#fff;
  border-radius:9px;cursor:pointer;align-items:center;justify-content:center;
}
.nav-toggle i{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.nav-toggle i::before,.nav-toggle i::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);
}
.nav-toggle i::before{top:-6px}
.nav-toggle i::after{top:6px}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(900px 480px at 12% -10%,rgba(58,130,244,.16),transparent 60%),
    radial-gradient(760px 420px at 88% 8%,rgba(140,91,244,.14),transparent 62%),
    var(--white);
  padding:86px 0 74px;
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:44px;line-height:1.22;margin-bottom:18px;letter-spacing:-.5px}
.hero .lead{font-size:17.5px;color:var(--muted);margin-bottom:28px;max-width:36em}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.tag{
  font-size:13px;padding:6px 13px;border-radius:999px;
  background:#fff;border:1px solid var(--line);color:var(--muted);
}
.hero-art{
  position:relative;border-radius:var(--radius-lg);padding:26px;
  background:var(--grad);color:#fff;box-shadow:var(--shadow-lg);
}
.hero-art::after{
  content:"";position:absolute;inset:0;border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(255,255,255,.18),transparent 55%);pointer-events:none;
}
.hero-art h4{color:#fff;margin:0 0 14px;font-size:16px;opacity:.95}
.qa-card{
  background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.26);
  border-radius:12px;padding:14px 16px;margin-bottom:12px;
  display:flex;align-items:flex-start;gap:12px;backdrop-filter:blur(4px);
}
.qa-card .dot{width:26px;height:26px;border-radius:8px;background:rgba(255,255,255,.28);flex:none;display:grid;place-items:center;font-size:12px;font-weight:700}
.qa-card .q{font-size:14px;font-weight:600;margin-bottom:4px}
.qa-card .a{font-size:13px;opacity:.9;line-height:1.6}

/* ---------- 数据条 ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  margin-top:52px;
}
.stat{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;text-align:center;box-shadow:var(--shadow);
}
.stat b{display:block;font-size:30px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;line-height:1.2}
.stat span{font-size:13.5px;color:var(--muted)}

/* ---------- 区块 ---------- */
.section{padding:78px 0}
.section.soft{background:var(--soft)}
.sec-head{max-width:680px;margin:0 auto 44px;text-align:center}
.sec-head .kicker{
  display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:1.4px;
  color:var(--brand1);background:#EEF3FF;padding:5px 13px;border-radius:999px;margin-bottom:14px;
}
.sec-head h2{font-size:32px;margin-bottom:12px}
.sec-head p{color:var(--muted);font-size:16px;margin:0}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow);transition:.22s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#D6E2FF}
.card .ic{
  width:46px;height:46px;border-radius:12px;background:var(--grad);
  display:grid;place-items:center;margin-bottom:16px;color:#fff;
  box-shadow:0 6px 16px rgba(58,130,244,.24);
}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px;margin:0}

/* ---------- 步骤流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.step{position:relative;padding-top:8px}
.step .n{
  width:40px;height:40px;border-radius:50%;background:var(--grad);color:#fff;
  display:grid;place-items:center;font-weight:800;margin-bottom:14px;
  box-shadow:0 6px 16px rgba(58,130,244,.26);
}
.step h4{font-size:16.5px;margin-bottom:6px}
.step p{color:var(--muted);font-size:14px;margin:0}

/* ---------- 文章 ---------- */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.post-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);transition:.22s;display:flex;flex-direction:column;
}
.post-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.post-cover{
  height:150px;background:var(--grad-soft);display:grid;place-items:center;
  border-bottom:1px solid var(--line);position:relative;overflow:hidden;
}
.post-cover::after{
  content:"";position:absolute;width:200px;height:200px;border-radius:50%;
  background:radial-gradient(circle,rgba(58,130,244,.16),transparent 70%);
}
.post-cover .glyph{
  font-size:34px;font-weight:900;color:rgba(58,130,244,.36);z-index:1;letter-spacing:1px;
}
.post-body{padding:20px;flex:1;display:flex;flex-direction:column}
.post-meta{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--muted);margin-bottom:10px;flex-wrap:wrap}
.badge{
  font-size:11.5px;padding:3px 10px;border-radius:999px;font-weight:600;
  background:#EEF3FF;color:var(--brand1);
}
.badge.alt{background:#F3EEFF;color:var(--brand2)}
.post-card h3{font-size:17px;margin-bottom:8px;line-height:1.45}
.post-card h3 a:hover{color:var(--brand1)}
.post-card p{color:var(--muted);font-size:14px;margin:0 0 14px;flex:1}
.post-more{font-size:13.5px;color:var(--brand1);font-weight:600}

/* 分类筛选 */
.filters{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:34px}
.filter{
  padding:8px 18px;border-radius:999px;border:1px solid var(--line);background:#fff;
  font-size:14px;cursor:pointer;transition:.15s;font-family:inherit;color:var(--ink-2);
}
.filter:hover{border-color:var(--brand1);color:var(--brand1)}
.filter.on{background:var(--grad);color:#fff;border-color:transparent;font-weight:600}

/* ---------- 文章详情 ---------- */
.article{max-width:820px;margin:0 auto}
.article-head{margin-bottom:32px}
.article-head h1{font-size:34px;line-height:1.35;margin-bottom:14px}
.article-body{font-size:16.5px;line-height:1.9;color:var(--ink-2)}
.article-body h2{font-size:24px;margin:38px 0 14px}
.article-body h3{font-size:19px;margin:28px 0 10px}
.article-body p{margin:0 0 18px}
.article-body ul,.article-body ol{margin:0 0 18px;padding-left:1.4em}
.article-body li{margin:8px 0}
.article-body blockquote{
  margin:22px 0;padding:14px 20px;border-left:4px solid var(--brand1);
  background:var(--soft);border-radius:0 10px 10px 0;color:var(--ink-2);
}
.article-body code{
  background:#F1F5F9;padding:2px 7px;border-radius:5px;font-size:14px;
  font-family:"Cascadia Code",Consolas,monospace;color:#334155;
}
.article-body pre{
  background:#0F1422;color:#E7ECF5;padding:16px 18px;border-radius:12px;
  overflow:auto;font-size:13.5px;margin:0 0 18px;
}
.article-body pre code{background:none;color:inherit;padding:0}
.article-body strong{color:var(--ink);font-weight:700}

/* ---------- CTA ---------- */
.cta{
  background:var(--grad);border-radius:var(--radius-lg);
  padding:52px 40px;text-align:center;color:#fff;box-shadow:var(--shadow-lg);
}
.cta h2{color:#fff;font-size:30px;margin-bottom:12px}
.cta p{opacity:.94;margin-bottom:26px;font-size:16px}
.cta .btn{background:#fff;color:var(--brand1)}
.cta .btn:hover{transform:translateY(-2px)}

/* ---------- 页脚 ---------- */
.footer{background:#0F1422;color:#A8B3C7;padding:60px 0 26px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;margin-bottom:36px}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer a{color:#A8B3C7;font-size:14px;display:block;padding:4px 0}
.footer a:hover{color:#fff}
.footer .brand span{color:#fff}
.footer .brand span.sub{color:#8894AB}
.footer p{font-size:14px;color:#8894AB}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding-top:20px;
  font-size:13px;color:#6B7789;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
}

/* ---------- 表单 ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:7px}
.field input,.field textarea,.field select{
  width:100%;padding:11px 14px;border:1px solid var(--line);border-radius:10px;
  font-size:14.5px;font-family:inherit;background:#fff;color:var(--ink);
}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--brand1);box-shadow:0 0 0 3px rgba(58,130,244,.12);
}
.field textarea{min-height:120px;resize:vertical}
.toast{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(20px);
  background:#0F1422;color:#fff;padding:13px 24px;border-radius:10px;font-size:14.5px;
  opacity:0;pointer-events:none;transition:.25s;z-index:999;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- 时间线 ---------- */
.timeline{position:relative;padding-left:30px}
.timeline::before{
  content:"";position:absolute;left:8px;top:6px;bottom:6px;width:2px;background:var(--line);
}
.tl-item{position:relative;margin-bottom:28px}
.tl-item::before{
  content:"";position:absolute;left:-26px;top:6px;width:14px;height:14px;border-radius:50%;
  background:var(--grad);border:3px solid #fff;box-shadow:0 0 0 2px rgba(58,130,244,.25);
}
.tl-item .yr{font-size:13px;font-weight:700;color:var(--brand1);margin-bottom:4px}
.tl-item h4{font-size:16px;margin-bottom:5px}
.tl-item p{font-size:14px;color:var(--muted);margin:0}

/* ---------- 响应式 ---------- */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:34px}
  .grid-3,.grid-4,.steps,.post-grid{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .container{padding:0 18px}
  .hero{padding:56px 0 48px}
  .hero h1{font-size:27px}
  .section{padding:54px 0}
  .sec-head h2{font-size:25px}
  .grid-2,.grid-3,.grid-4,.steps,.post-grid,.form-grid{grid-template-columns:1fr}
  .nav-links{
    display:none;position:absolute;top:66px;left:0;right:0;background:#fff;
    flex-direction:column;align-items:stretch;padding:12px;border-bottom:1px solid var(--line);
    box-shadow:0 10px 26px rgba(15,20,34,.08);
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 14px}
  .nav-toggle{display:flex}
  .footer-grid{grid-template-columns:1fr}
  .cta{padding:36px 22px}
  .cta h2{font-size:23px}
  .article-head h1{font-size:26px}
}

/* ---------- 建设期访问口令门 ---------- */
.gate-wrap{
  position:fixed;inset:0;z-index:9999;
  display:grid;place-items:center;padding:24px;
  background:linear-gradient(135deg,#3A82F4 0%,#8C5BF4 100%);
}
.gate-card{
  background:#fff;border-radius:18px;padding:40px 36px;
  max-width:420px;width:100%;
  box-shadow:0 24px 60px rgba(0,0,0,.22);
}
.gate-ic{
  width:64px;height:64px;border-radius:16px;
  background:linear-gradient(135deg,#3A82F4,#8C5BF4);
  color:#fff;display:grid;place-items:center;margin:0 auto 18px;
  box-shadow:0 8px 22px rgba(58,130,244,.3);
}
.gate-card h1{margin:0 0 8px;font-size:21px;text-align:center}
.gate-sub{margin:0 0 24px;color:#6B7280;font-size:14px;text-align:center;line-height:1.6}
.gate-err{color:#EF4444;font-size:13.5px;margin:8px 0 0;display:none;min-height:18px}
.gate-err.show{display:block}
.gate-tip{text-align:center;color:#9CA3AF;font-size:12px;margin:20px 0 0}