:root{
  --brand:#1f6feb;
  --brand-2:#ff7a45;
  --brand-3:#13c2c2;
  --brand-grad:linear-gradient(135deg,#1f6feb 0%,#3a8bff 45%,#13c2c2 100%);
  --brand-grad-2:linear-gradient(135deg,#ff7a45 0%,#ff9a6b 50%,#ffb347 100%);
  --bg:#ffffff;
  --bg-soft:#f5f8fc;
  --bg-glass:rgba(255,255,255,.72);
  --bg-glass-strong:rgba(255,255,255,.88);
  --text:#1c2430;
  --text-soft:#5a6675;
  --border:#e3e9f2;
  --border-glass:rgba(255,255,255,.55);
  --shadow:0 8px 30px rgba(31,111,235,.08);
  --shadow-hover:0 18px 44px rgba(31,111,235,.18);
  --shadow-glass:0 12px 40px rgba(20,40,80,.12);
  --radius:18px;
  --radius-sm:12px;
  --radius-pill:999px;
  --blur:16px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --header-h:66px;
}

html[data-theme="dark"]{
  --brand:#4d8dff;
  --brand-2:#ff8f5e;
  --brand-3:#2dd4d4;
  --brand-grad:linear-gradient(135deg,#2b5fd9 0%,#3d7bff 45%,#1fb8b8 100%);
  --brand-grad-2:linear-gradient(135deg,#f06a34 0%,#ff8f5e 50%,#ffb347 100%);
  --bg:#0e131a;
  --bg-soft:#151d27;
  --bg-glass:rgba(21,29,39,.72);
  --bg-glass-strong:rgba(21,29,39,.9);
  --text:#e6edf5;
  --text-soft:#9aa8b8;
  --border:#243040;
  --border-glass:rgba(120,150,190,.22);
  --shadow:0 8px 30px rgba(0,0,0,.45);
  --shadow-hover:0 18px 44px rgba(0,0,0,.6);
  --shadow-glass:0 12px 40px rgba(0,0,0,.5);
}

*{box-sizing:border-box;margin:0;padding:0}

html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}

body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
  transition:background-color .4s var(--ease),color .4s var(--ease);
}

img,svg{max-width:100%;display:block}

a{color:var(--brand);text-decoration:none;transition:color .25s var(--ease)}
a:hover{text-decoration:underline}

::selection{background:rgba(31,111,235,.22);color:var(--text)}

:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

.container{max-width:1180px;margin:0 auto;padding:0 20px}

.skip-link{
  position:absolute;left:-9999px;top:0;
  background:var(--brand);color:#fff;
  padding:10px 16px;z-index:999;border-radius:0 0 10px 0;
  transition:left .2s var(--ease);
}
.skip-link:focus{left:0;top:0;text-decoration:none}

/* ============ 顶栏 ============ */
.topbar{
  background:var(--brand-grad);
  color:#fff;font-size:13px;
  position:relative;overflow:hidden;
}
.topbar::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 20% 0%,rgba(255,255,255,.25),transparent 55%);
  pointer-events:none;
}
.topbar .container{
  display:flex;justify-content:space-between;align-items:center;
  padding:8px 20px;flex-wrap:wrap;gap:6px;position:relative;z-index:1;
}
.topbar a{color:#fff;text-decoration:underline;text-underline-offset:2px}
.topbar a:hover{opacity:.85}

/* ============ 头部导航 ============ */
header.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(var(--blur)) saturate(180%);
  backdrop-filter:blur(var(--blur)) saturate(180%);
  border-bottom:1px solid var(--border-glass);
  transition:box-shadow .35s var(--ease),background-color .35s var(--ease);
}
header.site-header.scrolled{
  box-shadow:var(--shadow-glass);
  background:var(--bg-glass-strong);
}

.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 20px;max-width:1180px;margin:0 auto;gap:16px;
}

.brand{
  display:flex;align-items:center;gap:10px;
  font-weight:700;font-size:20px;color:var(--text);
  text-decoration:none;flex-shrink:0;
}
.brand:hover{text-decoration:none}
.brand svg{
  width:38px;height:38px;
  transition:transform .6s var(--ease);
  filter:drop-shadow(0 4px 10px rgba(31,111,235,.25));
}
.brand:hover svg{transform:rotate(90deg)}
.brand span{line-height:1.15}
.brand small{
  display:block;font-size:11px;color:var(--text-soft);
  font-weight:400;letter-spacing:1.5px;
}

nav.main-nav ul{display:flex;gap:6px;list-style:none;flex-wrap:wrap}
nav.main-nav a{
  color:var(--text);font-size:15px;font-weight:500;
  padding:6px 12px;border-radius:var(--radius-pill);
  transition:background-color .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);
  display:inline-block;
}
nav.main-nav a:hover{
  color:var(--brand);background:rgba(31,111,235,.1);
  text-decoration:none;transform:translateY(-1px);
}

.nav-tools{display:flex;align-items:center;gap:10px}

.search-box{
  display:flex;align-items:center;
  border:1px solid var(--border);border-radius:var(--radius-pill);
  padding:4px 6px 4px 14px;
  background:var(--bg-soft);
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease),background-color .25s var(--ease);
}
.search-box:focus-within{
  border-color:var(--brand);
  box-shadow:0 0 0 4px rgba(31,111,235,.14);
  background:var(--bg);
}
.search-box input{
  border:none;background:transparent;outline:none;
  color:var(--text);width:130px;font-size:14px;font-family:inherit;
}
.search-box input::placeholder{color:var(--text-soft);opacity:.8}
.search-box button{
  border:none;background:var(--brand-grad);color:#fff;
  border-radius:var(--radius-pill);padding:6px 14px;
  cursor:pointer;font-size:13px;font-family:inherit;
  transition:transform .2s var(--ease),filter .2s var(--ease);
  background-size:180% 180%;
}
.search-box button:hover{transform:translateY(-1px);filter:brightness(1.08)}

.icon-btn{
  background:var(--bg-soft);border:1px solid var(--border);
  color:var(--text);border-radius:50%;
  width:38px;height:38px;cursor:pointer;font-size:16px;
  display:flex;align-items:center;justify-content:center;
  transition:transform .3s var(--ease),background-color .3s var(--ease),border-color .3s var(--ease);
}
.icon-btn:hover{
  transform:rotate(20deg) scale(1.06);
  border-color:var(--brand);
  background:rgba(31,111,235,.1);
}

.menu-toggle{
  display:none;background:var(--bg-soft);border:1px solid var(--border);
  border-radius:10px;color:var(--text);width:40px;height:40px;
  font-size:18px;cursor:pointer;align-items:center;justify-content:center;
  transition:background-color .25s var(--ease);
}
.menu-toggle:hover{background:rgba(31,111,235,.1)}

/* ============ 横幅 Banner ============ */
.banner{
  position:relative;overflow:hidden;
  background:var(--brand-grad);
  border-bottom:1px solid var(--border);
}
.banner::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(circle at 15% 20%,rgba(255,255,255,.28),transparent 45%),
    radial-gradient(circle at 85% 80%,rgba(255,255,255,.16),transparent 50%),
    radial-gradient(circle at 60% 10%,rgba(255,122,69,.35),transparent 55%);
  pointer-events:none;z-index:0;
}
.banner::after{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(255,255,255,.14) 1px,transparent 1px);
  background-size:22px 22px;
  opacity:.5;pointer-events:none;z-index:0;
}

.slides{position:relative;min-height:400px;z-index:1}

.slide{
  position:absolute;inset:0;opacity:0;
  transition:opacity .8s var(--ease),transform .8s var(--ease);
  transform:translateY(12px);
  display:flex;align-items:center;padding:56px 0;
  pointer-events:none;
}
.slide.active{
  opacity:1;position:relative;transform:none;
  pointer-events:auto;
}

.slide .container{
  display:grid;grid-template-columns:1.15fr .85fr;
  gap:36px;align-items:center;
}

.slide h1,.slide h2{
  font-size:34px;line-height:1.3;margin-bottom:16px;
  color:#fff;
  text-shadow:0 2px 18px rgba(0,20,60,.28);
  letter-spacing:.3px;
}
.slide p{
  color:rgba(255,255,255,.92);
  margin-bottom:22px;max-width:560px;font-size:15.5px;
}
.slide .tag{
  display:inline-block;
  background:rgba(255,255,255,.22);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,.35);
  color:#fff;padding:4px 14px;border-radius:var(--radius-pill);
  font-size:13px;margin-bottom:16px;letter-spacing:.5px;
}

.slide > .container > div:last-child{
  background:rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid rgba(255,255,255,.3);
  border-radius:var(--radius);
  padding:16px;
  box-shadow:0 16px 44px rgba(0,20,60,.22);
  transition:transform .5s var(--ease);
}
.slide.active > .container > div:last-child{animation:floatY 6s ease-in-out infinite}

@keyframes floatY{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-10px)}
}

.btn{
  display:inline-block;padding:11px 24px;
  border-radius:var(--radius-pill);
  font-weight:600;font-size:15px;border:none;cursor:pointer;
  font-family:inherit;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),background-color .25s var(--ease),filter .25s var(--ease);
}
.btn-primary{
  background:#fff;color:#1f6feb;
  box-shadow:0 8px 24px rgba(0,0,0,.18);
}
.btn-primary:hover{
  background:#fff;color:#1f6feb;text-decoration:none;
  transform:translateY(-2px);
  box-shadow:0 14px 34px rgba(0,0,0,.26);
}
.btn-ghost{
  background:rgba(255,255,255,.16);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,.5);
  color:#fff;margin-left:10px;
}
.btn-ghost:hover{
  background:rgba(255,255,255,.28);color:#fff;text-decoration:none;
  transform:translateY(-2px);
}

.banner-dots{
  position:absolute;bottom:20px;left:50%;transform:translateX(-50%);
  display:flex;gap:8px;z-index:5;
}
.banner-dots button{
  width:10px;height:10px;border-radius:var(--radius-pill);
  border:none;background:rgba(255,255,255,.45);cursor:pointer;
  transition:width .35s var(--ease),background-color .35s var(--ease);
}
.banner-dots button:hover{background:rgba(255,255,255,.75)}
.banner-dots button.active{background:#fff;width:26px}

/* ============ 主内容 ============ */
main{padding:0 0 40px}

section{
  padding:64px 0;
  position:relative;
  transition:background-color .4s var(--ease);
}
section:nth-child(even){background:var(--bg-soft)}

section[id]{scroll-margin-top:calc(var(--header-h) + 12px)}

.section-head{
  text-align:center;max-width:760px;margin:0 auto 40px;
}
.section-head h2{
  font-size:28px;margin-bottom:12px;
  line-height:1.35;letter-spacing:.3px;
  position:relative;display:inline-block;
}
.section-head h2::after{
  content:"";display:block;
  width:56px;height:4px;margin:12px auto 0;
  border-radius:var(--radius-pill);
  background:var(--brand-grad);
}
.section-head p{color:var(--text-soft);font-size:15px}

/* ============ 网格与卡片 ============ */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:26px;
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
  position:relative;
  overflow:hidden;
}
.card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--brand-grad);
  transform:scaleX(0);transform-origin:left;
  transition:transform .45s var(--ease);
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-hover);
  border-color:rgba(31,111,235,.35);
}
.card:hover::before{transform:scaleX(1)}

.card h3{
  font-size:18px;margin-bottom:10px;line-height:1.45;
  color:var(--text);
}
.card h3 + h3{margin-top:18px}
.card p{color:var(--text-soft);font-size:14.5px}
.card p + p{margin-top:12px}
.card ul{list-style:none;display:grid;gap:8px;font-size:14.5px}
.card ul a{color:var(--text-soft);transition:color .25s var(--ease),padding-left .25s var(--ease)}
.card ul a:hover{color:var(--brand);padding-left:4px;text-decoration:none}

.card .icon{
  width:52px;height:52px;margin-bottom:16px;
  transition:transform .4s var(--ease);
  filter:drop-shadow(0 6px 14px rgba(31,111,235,.16));
}
.card:hover .icon{transform:scale(1.08) rotate(-4deg)}

/* ============ 数据统计 ============ */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:20px;text-align:center;
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(var(--blur));
  backdrop-filter:blur(var(--blur));
  border:1px solid var(--border-glass);
  border-radius:var(--radius);
  padding:30px 20px;
  box-shadow:var(--shadow-glass);
}
.stats > div{
  padding:8px;
  border-radius:var(--radius-sm);
  transition:transform .3s var(--ease),background-color .3s var(--ease);
}
.stats > div:hover{transform:translateY(-4px);background:rgba(31,111,235,.06)}
.stat-num{
  font-size:34px;font-weight:800;
  background:var(--brand-grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
  letter-spacing:-.5px;line-height:1.2;
}
.stat-label{color:var(--text-soft);font-size:14px;margin-top:4px}

/* ============ 信任徽章 ============ */
.trust-badges{
  display:flex;gap:14px;flex-wrap:wrap;justify-content:center;
  margin-top:28px;
}
.trust-badges div{
  display:flex;align-items:center;gap:8px;
  font-size:13.5px;color:var(--text-soft);
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid var(--border-glass);
  padding:8px 18px;border-radius:var(--radius-pill);
  transition:transform .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.trust-badges div:hover{
  transform:translateY(-2px);
  border-color:rgba(31,111,235,.4);
  color:var(--brand);
}

/* ============ 文章列表 ============ */
.article-list{
  display:grid;grid-template-columns:repeat(2,1fr);gap:24px;
}
.article-card{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
  display:flex;flex-direction:column;
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.article-card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-hover);
  border-color:rgba(31,111,235,.35);
}
.article-card .thumb{
  aspect-ratio:16/9;background:var(--bg-soft);overflow:hidden;
}
.article-card .thumb svg{
  width:100%;height:100%;
  transition:transform .55s var(--ease);
}
.article-card:hover .thumb svg{transform:scale(1.06)}
.article-card .body{padding:22px;display:flex;flex-direction:column;flex:1}
.article-card h3{font-size:17px;margin-bottom:8px;line-height:1.5}
.article-card .meta{
  font-size:12.5px;color:var(--text-soft);margin-bottom:10px;
  display:flex;gap:12px;flex-wrap:wrap;align-items:center;
}
.article-card .meta time{color:var(--brand);font-weight:600}
.article-card .meta span{
  background:rgba(31,111,235,.1);color:var(--brand);
  padding:1px 10px;border-radius:var(--radius-pill);
}
.article-card p{
  font-size:14px;color:var(--text-soft);margin-bottom:16px;flex:1;
}
.article-card a.more{
  font-size:14px;font-weight:600;align-self:flex-start;
  transition:transform .25s var(--ease),color .25s var(--ease);
}
.article-card a.more:hover{transform:translateX(4px);text-decoration:none}

/* ============ FAQ ============ */
.faq-item{
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  margin-bottom:12px;
  background:var(--bg);
  overflow:hidden;
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease),background-color .3s var(--ease);
}
.faq-item:hover{border-color:rgba(31,111,235,.35);box-shadow:var(--shadow)}
.faq-item.open{
  border-color:rgba(31,111,235,.5);
  box-shadow:var(--shadow);
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.faq-q{
  width:100%;text-align:left;background:transparent;border:none;
  padding:18px 20px;font-size:16px;font-weight:600;color:var(--text);
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;
  gap:12px;font-family:inherit;line-height:1.5;
  transition:color .25s var(--ease);
}
.faq-q:hover{color:var(--brand)}
.faq-q span.arrow{
  transition:transform .35s var(--ease),color .25s var(--ease);
  color:var(--brand);flex-shrink:0;font-size:14px;
}
.faq-item.open .faq-q span.arrow{transform:rotate(180deg)}
.faq-a{
  max-height:0;overflow:hidden;
  transition:max-height .4s var(--ease),padding .4s var(--ease);
  padding:0 20px;
}
.faq-item.open .faq-a{max-height:600px;padding-bottom:18px}
.faq-a p{color:var(--text-soft);font-size:14.5px}

/* ============ 步骤 ============ */
.steps{
  counter-reset:step;display:grid;gap:16px;
}
.step{
  position:relative;
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:20px 20px 20px 68px;
  box-shadow:var(--shadow);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.step:hover{
  transform:translateX(6px);
  box-shadow:var(--shadow-hover);
  border-color:rgba(31,111,235,.35);
}
.step::before{
  counter-increment:step;content:counter(step);
  position:absolute;left:18px;top:18px;
  width:34px;height:34px;border-radius:50%;
  background:var(--brand-grad);color:#fff;
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:15px;
  box-shadow:0 6px 16px rgba(31,111,235,.32);
  transition:transform .35s var(--ease);
}
.step:hover::before{transform:scale(1.1) rotate(-8deg)}
.step h4{font-size:16px;margin-bottom:6px;color:var(--text)}
.step p{color:var(--text-soft);font-size:14.5px}

/* ============ 表格 ============ */
table.info-table{
  width:100%;border-collapse:collapse;font-size:14.5px;
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  overflow:hidden;
  box-shadow:var(--shadow);
}
table.info-table caption{
  text-align:left;padding:14px 18px;
  color:var(--text-soft);font-size:13.5px;
  background:var(--bg-soft);
  border-bottom:1px solid var(--border);
  font-weight:600;
}
table.info-table th,table.info-table td{
  padding:13px 18px;
  border-bottom:1px solid var(--border);
  text-align:left;
}
table.info-table th{
  background:var(--bg-soft);font-weight:600;color:var(--text);
  font-size:14px;letter-spacing:.3px;
}
table.info-table tbody tr{transition:background-color .25s var(--ease)}
table.info-table tbody tr:hover{background:rgba(31,111,235,.05)}
table.info-table tbody tr:last-child td{border-bottom:none}
table.info-table td:first-child{font-weight:600;color:var(--text)}

/* ============ 联系区域 ============ */
.contact-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start;
}
.contact-info li{
  list-style:none;padding:12px 0;
  border-bottom:1px dashed var(--border);
  display:flex;gap:12px;font-size:15px;flex-wrap:wrap;
  transition:background-color .25s var(--ease);
}
.contact-info li:last-child{border-bottom:none}
.contact-info li strong{min-width:80px;color:var(--text);flex-shrink:0}
.contact-info li span{color:var(--text-soft);word-break:break-word}

form.contact-form{display:grid;gap:14px}
form.contact-form input,
form.contact-form textarea{
  width:100%;padding:12px 16px;
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  background:var(--bg-soft);
  color:var(--text);font-size:14.5px;font-family:inherit;
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease),background-color .25s var(--ease);
}
form.contact-form input:focus,
form.contact-form textarea:focus{
  outline:none;border-color:var(--brand);background:var(--bg);
  box-shadow:0 0 0 4px rgba(31,111,235,.14);
}
form.contact-form textarea{min-height:130px;resize:vertical}
form.contact-form button{justify-self:start}

/* ============ 作者框 ============ */
.author-box{
  display:flex;gap:16px;align-items:center;
  background:var(--bg-glass);
  -webkit-backdrop-filter:blur(var(--blur));
  backdrop-filter:blur(var(--blur));
  border:1px solid var(--border-glass);
  border-radius:var(--radius);
  padding:22px;margin-top:28px;
  box-shadow:var(--shadow-glass);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.author-box:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.author-box svg{
  width:56px;height:56px;border-radius:50%;flex-shrink:0;
  box-shadow:0 6px 16px rgba(31,111,235,.25);
}
.author-box .info{font-size:14px;color:var(--text-soft);line-height:1.7}
.author-box .info strong{
  color:var(--text);display:block;font-size:15px;margin-bottom:4px;
}

/* ============ 面包屑 ============ */
.breadcrumb{
  font-size:13.5px;color:var(--text-soft);
  padding:18px 0;display:flex;flex-wrap:wrap;align-items:center;gap:2px;
}
.breadcrumb a{color:var(--text-soft);transition:color .25s var(--ease)}
.breadcrumb a:hover{color:var(--brand);text-decoration:none}
.breadcrumb span{margin:0 6px;opacity:.6}

/* ============ 页脚 ============ */
footer.site-footer{
  background:linear-gradient(180deg,#0b1119 0%,#080d13 100%);
  color:#c3cdd9;padding:60px 0 24px;font-size:14px;
  position:relative;overflow:hidden;
}
footer.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:var(--brand-grad);
}
footer.site-footer a{color:#c3cdd9;transition:color .25s var(--ease)}
footer.site-footer a:hover{color:#fff;text-decoration:none}

.footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;
  gap:36px;margin-bottom:40px;
}
.footer-grid h4{
  color:#fff;font-size:15px;margin-bottom:16px;
  position:relative;padding-bottom:10px;
}
.footer-grid h4::after{
  content:"";position:absolute;left:0;bottom:0;
  width:26px;height:2px;border-radius:var(--radius-pill);
  background:var(--brand-grad-2);
}
.footer-grid ul{list-style:none;display:grid;gap:9px}
.footer-grid ul a{
  display:inline-block;
  transition:color .25s var(--ease),transform .25s var(--ease);
}
.footer-grid ul a:hover{transform:translateX(4px);color:#fff}

.footer-bottom{
  border-top:1px solid #1e2a38;padding-top:22px;
  display:flex;justify-content:space-between;flex-wrap:wrap;
  gap:12px;color:#8b9aab;font-size:13px;
}

/* ============ 返回顶部 ============ */
#backTop{
  position:fixed;right:22px;bottom:22px;
  width:48px;height:48px;border-radius:50%;
  background:var(--brand-grad);color:#fff;border:none;
  font-size:18px;cursor:pointer;
  box-shadow:0 10px 28px rgba(31,111,235,.4);
  opacity:0;pointer-events:none;
  transition:opacity .35s var(--ease),transform .35s var(--ease),box-shadow .35s var(--ease);
  z-index:200;
  display:flex;align-items:center;justify-content:center;
}
#backTop.show{opacity:1;pointer-events:auto}
#backTop:hover{
  transform:translateY(-4px) scale(1.06);
  box-shadow:0 16px 36px rgba(31,111,235,.55);
}

/* ============ 滚动动画 ============ */
.reveal{
  opacity:0;transform:translateY(28px);
  transition:opacity .8s var(--ease),transform .8s var(--ease);
  will-change:opacity,transform;
}
.reveal.visible{opacity:1;transform:none}

/* ============ 响应式：平板 ============ */
@media(max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .slide h1,.slide h2{font-size:28px}
}

@media(max-width:960px){
  :root{--header-h:60px}
  .grid-3,.article-list,.grid-2,.contact-grid,.footer-grid{
    grid-template-columns:1fr 1fr;
  }
  .slide .container{grid-template-columns:1fr}
  .slide > .container > div:last-child{display:none}
  .slide{padding:44px 0}
  .slide h1,.slide h2{font-size:26px}
  .slides{min-height:340px}

  nav.main-nav{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--bg-glass-strong);
    -webkit-backdrop-filter:blur(var(--blur)) saturate(180%);
    backdrop-filter:blur(var(--blur)) saturate(180%);
    border-bottom:1px solid var(--border);
    padding:16px 20px;
    box-shadow:var(--shadow-glass);
    animation:navDrop .3s var(--ease);
  }
  @keyframes navDrop{
    from{opacity:0;transform:translateY(-8px)}
    to{opacity:1;transform:none}
  }
  nav.main-nav.open{display:block}
  nav.main-nav ul{flex-direction:column;gap:6px}
  nav.main-nav a{display:block;padding:10px 14px}
  .menu-toggle{display:flex}
  .search-box input{width:90px}
  .section-head h2{font-size:24px}
  section{padding:52px 0}
}

/* ============ 响应式：手机 ============ */
@media(max-width:640px){
  :root{--radius:16px}
  body{font-size:15.5px}
  .grid-3,.grid-4,.article-list,.grid-2,
  .contact-grid,.footer-grid,.stats{
    grid-template-columns:1fr;
  }
  .slides{min-height:320px}
  .slide h1,.slide h2{font-size:22px}
  .slide p{font-size:14.5px}
  .slide{padding:36px 0 48px}
  .btn{padding:10px 20px;font-size:14px}
  .btn-ghost{margin-left:0;margin-top:10px}
  .search-box{display:none}
  section{padding:44px 0}
  .section-head{margin-bottom:28px}
  .section-head h2{font-size:21px}
  .section-head p{font-size:14px}
  .card{padding:20px}
  .article-card .body{padding:18px}
  .step{padding:18px 18px 18px 62px}
  .step::before{left:16px;top:16px;width:30px;height:30px;font-size:14px}
  .stat-num{font-size:28px}
  .topbar .container{justify-content:center;text-align:center;font-size:12px}
  .author-box{flex-direction:column;text-align:center}
  .footer-bottom{justify-content:center;text-align:center}
  table.info-table{font-size:13.5px}
  table.info-table th,table.info-table td{padding:10px 12px}
  #backTop{right:16px;bottom:16px;width:44px;height:44px}
  .contact-info li strong{min-width:72px}
}

@media(max-width:400px){
  .container{padding:0 14px}
  .nav-wrap{padding:10px 14px}
  .brand{font-size:17px}
  .brand svg{width:32px;height:32px}
}

/* ============ 动效偏好 ============ */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none}
  .slide.active > .container > div:last-child{animation:none}
}

/* ============ 打印 ============ */
@media print{
  header.site-header,.topbar,.banner,.banner-dots,
  #backTop,footer.site-footer,.nav-tools{display:none !important}
  body{background:#fff;color:#000}
  .card,.article-card,.step,.faq-item{box-shadow:none;border:1px solid #ccc;break-inside:avoid}
  .reveal{opacity:1;transform:none}
  section{padding:20px 0}
}