/* =========================================================
   TG号购买 · 原创样式
   风格：清爽科技蓝 / 卡片错落 / 时间轴 / 手风琴
   ========================================================= */

/* -------- 1. 变量 -------- */
:root{
  --c-primary:#2AABEE;
  --c-primary-d:#1789c7;
  --c-primary-l:#E9F5FD;
  --c-primary-glow:rgba(42,171,238,.28);

  --c-ink:#14203a;
  --c-ink-2:#3b4a63;
  --c-ink-3:#6b7a91;
  --c-ink-4:#9aa7b8;

  --c-bg:#ffffff;
  --c-bg-2:#f5f9fc;
  --c-bg-3:#eef4f9;
  --c-dark:#0e1a2c;
  --c-dark-2:#152744;

  --c-line:#e6edf4;
  --c-line-2:#d3e0ec;

  --c-ok:#16a34a;

  --r-s:8px;
  --r-m:14px;
  --r-l:20px;
  --r-xl:28px;

  --sh-s:0 1px 2px rgba(15,26,43,.05);
  --sh-m:0 8px 24px rgba(15,26,43,.07);
  --sh-l:0 18px 44px rgba(15,26,43,.1);
  --sh-p:0 14px 34px rgba(42,171,238,.3);

  --max:1200px;
  --nav-h:72px;
  --ease:cubic-bezier(.4,0,.2,1);
}

/* -------- 2. 重置 -------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:96px;-webkit-text-size-adjust:100%}
body{
  font:16px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  color:var(--c-ink);background:var(--c-bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;transition:.25s var(--ease)}
ul,ol{list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;cursor:pointer;background:none;border:0;color:inherit}
::selection{background:var(--c-primary);color:#fff}

::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--c-bg-2)}
::-webkit-scrollbar-thumb{
  background:var(--c-line-2);border-radius:10px;border:2px solid var(--c-bg-2);
}
::-webkit-scrollbar-thumb:hover{background:var(--c-primary)}

/* -------- 3. 顶部信息条 -------- */
.topbar{
  position:relative;z-index:1001;
  background:linear-gradient(90deg,var(--c-dark),var(--c-dark-2));
  color:#c8d6e5;font-size:13px;
}
.topbar-inner{
  max-width:var(--max);margin:0 auto;
  padding:9px 24px;
  display:flex;align-items:center;gap:24px;flex-wrap:wrap;
  justify-content:center;
}
.topbar-item{display:inline-flex;align-items:center;gap:8px}
.topbar-item .dot{
  width:6px;height:6px;border-radius:50%;background:#3ddc84;
  box-shadow:0 0 0 3px rgba(61,220,132,.2);
  animation:blink 1.8s infinite;
}
@keyframes blink{
  0%,100%{box-shadow:0 0 0 3px rgba(61,220,132,.2)}
  50%{box-shadow:0 0 0 6px rgba(61,220,132,.06)}
}
.topbar-link{
  margin-left:auto;color:#fff;font-weight:600;
  padding:4px 12px;border-radius:999px;
  background:rgba(255,255,255,.1);
}
.topbar-link:hover{background:var(--c-primary)}

/* -------- 4. 导航 -------- */
.nav{
  position:sticky;top:0;z-index:1000;
  height:var(--nav-h);
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(16px);
  -webkit-backdrop-filter:saturate(180%) blur(16px);
  border-bottom:1px solid var(--c-line);
  transition:.3s var(--ease);
}
.nav.is-scrolled{box-shadow:0 6px 24px rgba(15,26,43,.06)}
.nav-inner{
  max-width:var(--max);height:100%;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}

.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:38px;height:38px;display:flex;align-items:center;justify-content:center;
  border-radius:11px;
  background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  box-shadow:0 6px 16px var(--c-primary-glow);
  transition:.35s var(--ease);
}
.brand:hover .brand-mark{transform:rotate(-8deg) scale(1.06)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-size:16px;font-weight:800;letter-spacing:-.3px}
.brand-text em{
  font-size:11px;font-style:normal;color:var(--c-ink-4);letter-spacing:.3px;
}

.nav-menu{display:flex;gap:2px;flex:1;justify-content:center}
.nav-menu a{
  padding:8px 14px;font-size:15px;font-weight:500;
  color:var(--c-ink-2);border-radius:var(--r-s);
}
.nav-menu a:hover{color:var(--c-primary);background:var(--c-primary-l)}

.nav-cta{
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 20px;border-radius:999px;
  font-size:15px;font-weight:600;color:#fff;
  background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  box-shadow:0 6px 18px var(--c-primary-glow);
  flex-shrink:0;
}
.nav-cta:hover{
  transform:translateY(-2px);
  box-shadow:0 12px 28px rgba(42,171,238,.42);
}

/* -------- 5. Hero -------- */
.hero{
  position:relative;
  padding:72px 24px 96px;
  background:
    radial-gradient(ellipse 70% 60% at 15% 0%,rgba(42,171,238,.14),transparent 60%),
    radial-gradient(ellipse 60% 50% at 90% 10%,rgba(92,198,245,.12),transparent 65%),
    linear-gradient(180deg,#f7fbff 0%,#fff 100%);
  overflow:hidden;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(42,171,238,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,171,238,.05) 1px,transparent 1px);
  background-size:52px 52px;
  mask-image:radial-gradient(ellipse 70% 70% at 50% 30%,#000 10%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 70% 70% at 50% 30%,#000 10%,transparent 75%);
}
.hero-grid{
  position:relative;z-index:1;
  max-width:var(--max);margin:0 auto;
  display:grid;grid-template-columns:1.15fr .85fr;
  gap:64px;align-items:center;
}

.hero-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 16px;margin-bottom:24px;
  font-size:13px;font-weight:600;letter-spacing:.3px;
  color:var(--c-primary-d);background:#fff;
  border:1px solid var(--c-line-2);border-radius:999px;
  box-shadow:var(--sh-s);
}
.hero-chip i{
  width:7px;height:7px;border-radius:50%;background:var(--c-ok);
  box-shadow:0 0 0 4px rgba(22,163,74,.15);
}

.hero-h1{
  font-size:clamp(30px,4.4vw,50px);font-weight:800;
  line-height:1.22;letter-spacing:-1px;color:var(--c-ink);
  margin-bottom:20px;
}
.hero-h1 .mark{
  color:var(--c-primary);
  background:linear-gradient(180deg,transparent 64%,rgba(42,171,238,.2) 64%);
  padding:0 4px;
}
.hero-p{
  font-size:17px;line-height:1.85;color:var(--c-ink-3);
  margin-bottom:34px;
}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:48px}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:15px 32px;font-size:16px;font-weight:600;border-radius:999px;
  transition:.3s var(--ease);border:2px solid transparent;
}
.btn-solid{
  color:#fff;background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  box-shadow:var(--sh-p);
}
.btn-solid:hover{transform:translateY(-3px);box-shadow:0 18px 42px rgba(42,171,238,.45)}
.btn-ghost{
  color:var(--c-primary-d);background:#fff;border-color:var(--c-line-2);
}
.btn-ghost:hover{
  border-color:var(--c-primary);color:var(--c-primary);
  transform:translateY(-3px);box-shadow:0 12px 28px rgba(42,171,238,.15);
}

.hero-metrics{
  display:flex;gap:40px;flex-wrap:wrap;
}
.hero-metrics>div{display:flex;flex-direction:column;gap:2px}
.hero-metrics dt{
  font-size:28px;font-weight:800;color:var(--c-primary);
  letter-spacing:-.5px;line-height:1.1;
}
.hero-metrics dd{font-size:13px;color:var(--c-ink-4)}

/* Hero 右侧信息卡 */
.hero-right{position:relative}
.info-card{
  position:relative;z-index:2;
  padding:28px;
  background:#fff;
  border:1px solid var(--c-line);
  border-radius:var(--r-xl);
  box-shadow:0 24px 60px rgba(15,26,43,.1);
}
.info-card-head{
  display:flex;align-items:center;justify-content:space-between;
  padding-bottom:18px;margin-bottom:20px;
  border-bottom:1px solid var(--c-line);
}
.info-tag{
  padding:5px 12px;font-size:12px;font-weight:700;letter-spacing:.5px;
  color:var(--c-primary-d);background:var(--c-primary-l);border-radius:999px;
}
.info-live{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;color:var(--c-ok);font-weight:600;
}
.info-live i{
  width:6px;height:6px;border-radius:50%;background:var(--c-ok);
  box-shadow:0 0 0 3px rgba(22,163,74,.18);
  animation:blink 1.8s infinite;
}
.info-list{display:flex;flex-direction:column;gap:14px;margin-bottom:22px}
.info-list li{
  display:flex;justify-content:space-between;align-items:center;
  padding:12px 16px;border-radius:var(--r-m);
  background:var(--c-bg-2);
  transition:.25s var(--ease);
}
.info-list li:hover{background:var(--c-primary-l);transform:translateX(3px)}
.info-label{font-size:14px;color:var(--c-ink-3)}
.info-value{font-size:14px;font-weight:700;color:var(--c-ink)}

.info-foot .bar{
  height:8px;border-radius:999px;background:var(--c-bg-3);
  overflow:hidden;margin-bottom:10px;
}
.bar-fill{
  display:block;height:100%;border-radius:999px;
  background:linear-gradient(90deg,var(--c-primary),#5cc6f5);
  animation:fill 1.6s var(--ease);
}
@keyframes fill{from{width:0}}
.info-foot p{font-size:13px;color:var(--c-ink-3);text-align:center}
.info-foot b{color:var(--c-primary);font-size:14px}

.float-badge{
  position:absolute;padding:8px 16px;
  font-size:13px;font-weight:700;
  background:#fff;border-radius:999px;
  box-shadow:0 12px 30px rgba(15,26,43,.12);
  z-index:3;
}
.float-1{
  top:-16px;right:-8px;color:var(--c-primary-d);
  border:1px solid var(--c-line-2);
  animation:float 3.5s ease-in-out infinite;
}
.float-2{
  bottom:-16px;left:-8px;color:#fff;
  background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  animation:float 3.5s ease-in-out infinite .8s;
}
@keyframes float{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-8px)}
}

/* -------- 6. 通用 Section -------- */
.sec{padding:88px 24px;position:relative}
.sec-head{max-width:720px;margin:0 auto 56px;text-align:center}
.sec-tag{
  display:inline-block;padding:6px 16px;margin-bottom:16px;
  font-size:12px;font-weight:800;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--c-primary);background:var(--c-primary-l);border-radius:999px;
}
.sec-title{
  font-size:clamp(24px,3.2vw,36px);font-weight:800;
  line-height:1.28;letter-spacing:-.6px;color:var(--c-ink);
  margin-bottom:12px;
}
.sec-desc{font-size:16px;color:var(--c-ink-3)}

/* -------- 7. 服务优势 -------- */
.adv-grid{
  max-width:var(--max);margin:0 auto;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:24px;
}
.adv-card{
  position:relative;padding:36px 28px 32px;
  background:#fff;border:1px solid var(--c-line);
  border-radius:var(--r-l);box-shadow:var(--sh-s);
  transition:.35s var(--ease);overflow:hidden;
}
.adv-card::after{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;
  background:linear-gradient(90deg,var(--c-primary),#5cc6f5);
  transform:scaleX(0);transform-origin:left;
  transition:transform .35s var(--ease);
}
.adv-card:hover{
  transform:translateY(-6px);border-color:var(--c-primary);
  box-shadow:0 20px 46px rgba(42,171,238,.14);
}
.adv-card:hover::after{transform:scaleX(1)}

.adv-num{
  position:absolute;top:24px;right:28px;
  font-size:32px;font-weight:900;color:var(--c-bg-3);
  letter-spacing:-2px;line-height:1;
  transition:.35s var(--ease);
}
.adv-card:hover .adv-num{color:var(--c-primary-l)}

.adv-icon{
  width:56px;height:56px;display:flex;align-items:center;justify-content:center;
  margin-bottom:22px;border-radius:16px;background:var(--c-primary-l);
  transition:.35s var(--ease);
}
.adv-card:hover .adv-icon{transform:scale(1.08) rotate(-5deg)}
.adv-card h3{font-size:19px;font-weight:700;margin-bottom:10px}
.adv-card p{font-size:14.5px;line-height:1.75;color:var(--c-ink-3)}

/* -------- 8. 账号类型 -------- */
.sec-catalog{
  background:var(--c-bg-2);
}
.sec-catalog::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--c-line-2),transparent);
}
.cat-grid{
  max-width:var(--max);margin:0 auto;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:22px;
}
.cat-card{
  position:relative;display:flex;flex-direction:column;
  padding:34px 28px;background:#fff;
  border:1.5px solid var(--c-line);border-radius:var(--r-l);
  box-shadow:var(--sh-s);transition:.35s var(--ease);
}
.cat-card:hover{
  transform:translateY(-6px);border-color:var(--c-primary);
  box-shadow:0 24px 52px rgba(42,171,238,.16);
}
.cat-hot{
  border-color:var(--c-primary);
  background:linear-gradient(180deg,#f8fcff,#fff 65%);
  box-shadow:0 16px 40px rgba(42,171,238,.14);
}
.cat-hot::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--c-primary),#5cc6f5);
  border-radius:var(--r-l) var(--r-l) 0 0;
}
.cat-flag{
  position:absolute;top:20px;right:20px;
  padding:5px 12px;font-size:12px;font-weight:700;letter-spacing:.3px;
  color:var(--c-primary-d);background:var(--c-primary-l);border-radius:999px;
}
.flag-hot{
  color:#fff;background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  box-shadow:0 6px 16px var(--c-primary-glow);
}
.cat-card h3{
  font-size:21px;font-weight:800;letter-spacing:-.3px;
  margin-bottom:10px;
}
.cat-card>p{
  font-size:14.5px;line-height:1.75;color:var(--c-ink-3);
  margin-bottom:20px;min-height:52px;
}
.cat-card ul{
  padding-top:20px;margin-bottom:26px;flex:1;
  border-top:1px dashed var(--c-line-2);
}
.cat-card ul li{
  position:relative;padding-left:26px;margin-bottom:10px;
  font-size:14.5px;color:var(--c-ink-2);
}
.cat-card ul li::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:16px;height:16px;border-radius:50%;
  background:var(--c-primary-l)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M4 8.5l3 3 5-6' stroke='%232AABEE' stroke-width='2' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E")
    center/12px no-repeat;
}
.cat-btn{
  display:block;width:100%;padding:13px;text-align:center;
  font-size:15px;font-weight:600;color:var(--c-primary-d);
  background:var(--c-primary-l);border-radius:var(--r-m);
  transition:.3s var(--ease);
}
.cat-btn:hover{
  color:#fff;background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  box-shadow:var(--sh-p);transform:translateY(-2px);
}
.cat-btn-solid{
  color:#fff;background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  box-shadow:0 8px 20px var(--c-primary-glow);
}
.cat-btn-solid:hover{box-shadow:0 14px 32px rgba(42,171,238,.45)}

/* -------- 9. 购买教程（横向时间轴） -------- */
.timeline{
  position:relative;max-width:900px;margin:0 auto;
  padding-left:38px;
}
.timeline::before{
  content:"";position:absolute;left:11px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg,var(--c-primary),var(--c-line-2));
  border-radius:2px;
}
.tl-item{position:relative;padding-bottom:28px}
.tl-item:last-child{padding-bottom:0}
.tl-dot{
  position:absolute;left:-38px;top:6px;
  width:24px;height:24px;border-radius:50%;
  background:#fff;border:3px solid var(--c-primary);
  box-shadow:0 0 0 6px rgba(42,171,238,.1);
  transition:.35s var(--ease);
}
.tl-item:hover .tl-dot{
  transform:scale(1.15);box-shadow:0 0 0 10px rgba(42,171,238,.14);
}
.tl-body{
  padding:24px 28px;background:#fff;
  border:1px solid var(--c-line);border-radius:var(--r-l);
  box-shadow:var(--sh-s);transition:.3s var(--ease);
}
.tl-item:hover .tl-body{
  border-color:var(--c-primary);
  box-shadow:0 14px 36px rgba(42,171,238,.12);
  transform:translateX(4px);
}
.tl-body h3{
  font-size:17px;font-weight:700;margin-bottom:8px;
}
.tl-body p{font-size:15px;line-height:1.8;color:var(--c-ink-3)}

/* -------- 10. 老号对比 -------- */
.sec-matrix{background:var(--c-bg-2)}
.matrix-wrap{
  max-width:960px;margin:0 auto;
  background:#fff;border:1px solid var(--c-line);
  border-radius:var(--r-l);box-shadow:var(--sh-m);
  overflow:hidden;
}
.matrix{width:100%;border-collapse:collapse;font-size:15px}
.matrix thead{
  background:linear-gradient(135deg,var(--c-dark),var(--c-dark-2));
}
.matrix thead th{
  padding:20px 16px;font-size:15px;font-weight:700;
  color:#fff;text-align:center;letter-spacing:.3px;
}
.matrix thead th:first-child{text-align:left;padding-left:28px}
.matrix thead .th-hot{
  background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  position:relative;
}
.matrix tbody td{
  padding:18px 16px;text-align:center;color:var(--c-ink-2);
  border-bottom:1px solid var(--c-line);
  transition:background .25s var(--ease);
}
.matrix tbody td:first-child{
  text-align:left;padding-left:28px;font-weight:600;color:var(--c-ink);
  background:#fafcfe;
}
.matrix tbody tr:last-child td{border-bottom:none}
.matrix tbody tr:hover td{background:var(--c-primary-l)}
.matrix tbody tr:hover td:first-child{background:#dceefb}
.matrix tbody .td-hot{color:var(--c-primary-d);font-weight:700}

/* -------- 11. 相关搜索 -------- */
.chips{
  max-width:960px;margin:0 auto;
  display:flex;flex-wrap:wrap;gap:12px;justify-content:center;
}
.chips a{
  display:inline-block;padding:10px 20px;
  font-size:14px;font-weight:500;color:var(--c-ink-2);
  background:#fff;border:1px solid var(--c-line);border-radius:999px;
  transition:.28s var(--ease);
}
.chips a:hover{
  color:#fff;border-color:transparent;
  background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  transform:translateY(-3px);
  box-shadow:0 10px 24px var(--c-primary-glow);
}

/* -------- 12. FAQ 手风琴 -------- */
.faq{
  max-width:880px;margin:0 auto;
  display:flex;flex-direction:column;gap:12px;
}
.faq-item{
  background:#fff;border:1px solid var(--c-line);
  border-radius:var(--r-l);box-shadow:var(--sh-s);
  transition:.3s var(--ease);overflow:hidden;
}
.faq-item:hover{
  border-color:var(--c-primary);
  box-shadow:0 14px 36px rgba(42,171,238,.12);
}
.faq-item[open]{border-color:var(--c-primary)}
.faq-item summary{
  display:flex;align-items:center;gap:14px;
  padding:22px 28px;list-style:none;cursor:pointer;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-q{
  flex:1;font-size:16px;font-weight:700;color:var(--c-ink);
}
.faq-icon{
  position:relative;width:22px;height:22px;flex-shrink:0;
  border-radius:50%;background:var(--c-primary-l);
  transition:.3s var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;left:50%;top:50%;
  background:var(--c-primary);border-radius:2px;
  transform:translate(-50%,-50%);
}
.faq-icon::before{width:10px;height:2px}
.faq-icon::after{width:2px;height:10px;transition:.3s var(--ease)}
.faq-item[open] .faq-icon{background:var(--c-primary)}
.faq-item[open] .faq-icon::before,
.faq-item[open] .faq-icon::after{background:#fff}
.faq-item[open] .faq-icon::after{transform:translate(-50%,-50%) rotate(90deg);opacity:0}
.faq-a{
  padding:0 28px 24px 64px;
  font-size:14.5px;line-height:1.85;color:var(--c-ink-3);
}

/* -------- 13. 退款横幅 -------- */
.cta-strip{padding:0 24px 88px;background:var(--c-bg)}
.cta-strip-inner{
  position:relative;max-width:var(--max);margin:0 auto;
  padding:48px 52px;display:flex;align-items:center;
  justify-content:space-between;gap:32px;flex-wrap:wrap;
  background:linear-gradient(135deg,var(--c-dark) 0%,var(--c-dark-2) 60%,#1d3a5c 100%);
  border-radius:var(--r-xl);
  box-shadow:0 24px 60px rgba(15,26,43,.28);
  overflow:hidden;
}
.cta-strip-inner::before{
  content:"";position:absolute;top:-50%;right:-10%;
  width:400px;height:400px;pointer-events:none;
  background:radial-gradient(circle,rgba(42,171,238,.3),transparent 70%);
}
.cta-strip-inner::after{
  content:"";position:absolute;bottom:-60%;left:-5%;
  width:320px;height:320px;pointer-events:none;
  background:radial-gradient(circle,rgba(92,198,245,.16),transparent 70%);
}
.cta-strip-text{position:relative;z-index:1}
.cta-strip-text h3{
  font-size:26px;font-weight:800;color:#fff;
  letter-spacing:-.4px;margin-bottom:8px;
}
.cta-strip-text p{font-size:15px;color:rgba(255,255,255,.72)}
.btn-light{
  position:relative;z-index:1;flex-shrink:0;
  padding:16px 40px;font-size:16px;font-weight:700;
  color:var(--c-dark);background:#fff;border-radius:999px;
  box-shadow:0 12px 32px rgba(0,0,0,.25);
}
.btn-light:hover{
  transform:translateY(-3px) scale(1.03);
  background:var(--c-primary);color:#fff;
  box-shadow:0 18px 42px rgba(42,171,238,.5);
}

/* -------- 14. Footer -------- */
.foot{
  padding:56px 24px 32px;background:var(--c-bg-2);
  border-top:1px solid var(--c-line);
}
.foot-inner{
  max-width:var(--max);margin:0 auto;
  display:flex;flex-direction:column;align-items:center;gap:22px;
  text-align:center;
}
.foot-brand b{
  display:block;font-size:18px;font-weight:800;margin-bottom:6px;
}
.foot-brand p{font-size:14px;color:var(--c-ink-4)}
.foot-nav{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:center}
.foot-nav a{
  position:relative;padding:4px 0;
  font-size:14.5px;font-weight:500;color:var(--c-ink-2);
}
.foot-nav a::after{
  content:"";position:absolute;left:0;bottom:0;
  width:0;height:2px;background:var(--c-primary);
  transition:width .3s var(--ease);
}
.foot-nav a:hover{color:var(--c-primary)}
.foot-nav a:hover::after{width:100%}
.foot-copy{
  width:100%;padding-top:20px;border-top:1px solid var(--c-line);
  font-size:13px;color:var(--c-ink-4);
}

/* -------- 15. 回到顶部 -------- */
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:900;
  width:44px;height:44px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  color:#fff;background:linear-gradient(135deg,var(--c-primary),#5cc6f5);
  box-shadow:var(--sh-p);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:.3s var(--ease);
}
.to-top.is-show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{transform:translateY(-4px);box-shadow:0 18px 42px rgba(42,171,238,.45)}

/* -------- 16. 响应式 -------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .hero-right{max-width:520px;margin:0 auto;width:100%}
  .nav-menu{display:none}
}
@media (max-width:768px){
  :root{--nav-h:64px}
  .sec{padding:64px 20px}
  .topbar-inner{padding:8px 16px;gap:12px;font-size:12px}
  .topbar-item:nth-child(2){display:none}
  .topbar-link{margin-left:0;padding:3px 10px}

  .nav-inner{padding:0 16px;gap:12px}
  .brand-text b{font-size:15px}
  .brand-text em{display:none}
  .nav-cta{padding:9px 16px;font-size:14px}

  .hero{padding:48px 20px 64px}
  .hero-cta{flex-direction:column;align-items:stretch}
  .hero-cta .btn{width:100%}
  .hero-metrics{gap:24px}

  .adv-grid,.cat-grid{grid-template-columns:1fr;gap:18px}

  .timeline{padding-left:32px}
  .tl-dot{left:-32px;width:20px;height:20px}
  .tl-body{padding:20px 22px}

  .matrix{font-size:13.5px}
  .matrix thead th,.matrix tbody td{padding:13px 10px}
  .matrix thead th:first-child,
  .matrix tbody td:first-child{padding-left:16px}

  .faq-item summary{padding:18px 20px}
  .faq-q{font-size:15px}
  .faq-a{padding:0 20px 20px;font-size:14px}

  .cta-strip{padding:0 20px 64px}
  .cta-strip-inner{padding:36px 26px;flex-direction:column;text-align:center}
  .cta-strip-text h3{font-size:22px}
  .btn-light{width:100%}

  .to-top{right:16px;bottom:16px;width:40px;height:40px}
}
@media (max-width:480px){
  .hero-h1{font-size:26px}
  .hero-metrics dt{font-size:22px}
  .chips a{padding:8px 14px;font-size:13px}
  .float-badge{display:none}
}

/* -------- 17. 无障碍与打印 -------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
}
@media print{
  .topbar,.nav,.hero-cta,.cta-strip,.foot-nav,.to-top{display:none}
  body{color:#000}
  .sec{padding:20px 0;page-break-inside:avoid}
}