/* =============================================================
   domain-name.css —— 域名注册服务
   左文右卡首屏 + 后缀三栏对比 + 五步纵向时间线 + DNS 图解
   ============================================================= */

/* 1. 首屏：左文右卡 */
.dn-hero{
  padding:calc(var(--header-h) + var(--topbar-h) + 60px) 0 90px;
  background:
    linear-gradient(135deg, var(--paper) 0%, var(--paper-deep) 100%);
  position:relative;overflow:hidden;
}
.dn-hero::before{
  content:"";position:absolute;left:-120px;bottom:-120px;
  width:380px;height:380px;border-radius:50%;
  background:radial-gradient(circle, rgba(174,135,73,.18), transparent 70%);
}
.dn-hero-inner{
  display:grid;grid-template-columns:1.3fr 1fr;gap:60px;align-items:center;
  position:relative;z-index:2;
}
.dn-hero-kicker{
  font-size:12.5px;letter-spacing:.34em;color:var(--earth-deep);margin-bottom:22px;
}
.dn-hero-title{
  font-size:clamp(32px,4.6vw,52px);line-height:1.3;margin-bottom:24px;
}
.dn-hero-title em{
  font-style:normal;color:var(--earth-deep);
  border-bottom:3px solid var(--earth);
}
.dn-hero-sub{
  font-size:15.5px;color:var(--ink-soft);line-height:1.95;margin-bottom:30px;max-width:560px;
}
.dn-hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.dn-hero-contact{font-size:13px;color:var(--ink-faint)}
.dn-hero-contact a{color:var(--ink);border-bottom:1px dashed var(--line-strong)}
.dn-hero-contact a:hover{color:var(--earth-deep)}

.dn-hero-card{
  background:var(--paper);border:1px solid var(--line-strong);
  padding:34px 30px;box-shadow:var(--shadow);
  border-radius:var(--radius);
}
.dn-card-title{
  font-family:var(--font-serif);font-size:18px;margin-bottom:18px;
  padding-bottom:12px;border-bottom:1px solid var(--line);
}
.dn-card-list{display:flex;flex-direction:column;gap:14px}
.dn-card-list li{
  display:grid;grid-template-columns:60px 1fr;gap:6px 14px;
  align-items:baseline;font-size:13.5px;
}
.dn-card-list li span{
  font-family:var(--font-serif);font-size:16px;color:var(--earth-deep);
  font-weight:700;
}
.dn-card-list li b{font-size:13.5px;color:var(--ink)}
.dn-card-list li em{
  grid-column:2;font-style:normal;color:var(--ink-faint);font-size:12.5px;
}
.dn-card-note{
  margin-top:18px;padding-top:14px;border-top:1px dashed var(--line);
  font-size:12.5px;color:var(--ink-faint);line-height:1.7;
}

/* 2. TLD 三栏 */
.dn-tld-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.dn-tld{
  background:var(--paper);padding:36px 28px;
  border:1px solid var(--line);border-radius:var(--radius);
  transition:all .32s ease;position:relative;
}
.dn-tld:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--earth)}
.dn-tld-ext{
  display:inline-block;font-family:var(--font-serif);
  font-size:38px;color:var(--earth-deep);margin-bottom:14px;
}
.dn-tld h3{font-size:19px;margin-bottom:12px}
.dn-tld p{font-size:13.8px;color:var(--ink-soft);line-height:1.85;margin-bottom:18px}
.dn-tld ul{
  display:flex;flex-direction:column;gap:8px;
  border-top:1px dashed var(--line);padding-top:14px;
}
.dn-tld ul li{
  font-size:13px;color:var(--ink-soft);padding-left:14px;position:relative;
}
.dn-tld ul li::before{
  content:"";position:absolute;left:0;top:10px;
  width:6px;height:6px;background:var(--earth);border-radius:50%;
}

/* 3. 五步纵向时间线 */
.dn-step-section{background:var(--paper-deep)}
.dn-steps{
  display:grid;grid-template-columns:repeat(5,1fr);gap:20px;
  counter-reset:step;
}
.dn-step{
  background:var(--paper);padding:28px 22px;
  border-top:3px solid var(--earth);
  position:relative;
}
.dn-step-no{
  font-family:var(--font-serif);font-size:38px;color:var(--brown-light);
  line-height:1;margin-bottom:14px;display:block;
}
.dn-step h3{font-size:16.5px;margin-bottom:10px}
.dn-step p{font-size:13px;color:var(--ink-soft);line-height:1.8}

/* 4. DNS 图解 */
.dn-dns-wrap{
  display:grid;grid-template-columns:1.1fr 1fr;gap:60px;align-items:center;
}
.dn-dns-copy h2{margin-bottom:18px}
.dn-dns-copy .lead{margin-bottom:22px}
.dn-dns-list{
  display:flex;flex-direction:column;gap:10px;margin-bottom:18px;
}
.dn-dns-list li{
  font-size:14px;color:var(--ink-soft);line-height:1.8;
  padding:10px 14px;background:var(--paper-deep);
  border-left:3px solid var(--earth);
}
.dn-dns-list b{color:var(--ink);font-family:var(--font-serif)}
.dn-dns-tip{
  font-size:13px;color:var(--ink-faint);line-height:1.8;
}
.dn-dns-tip a{color:var(--earth-deep);border-bottom:1px solid var(--line)}
.dn-dns-tip a:hover{color:var(--earth)}

.dn-dns-diagram{
  background:var(--paper-dark);padding:36px 28px;
  border-radius:var(--radius);display:flex;flex-direction:column;gap:18px;
}
.dns-row{
  display:flex;align-items:center;gap:14px;justify-content:center;
}
.dns-node{
  background:var(--paper);border:1px solid var(--line-strong);
  padding:14px 18px;text-align:center;
  font-size:13.5px;color:var(--ink);line-height:1.5;
  flex:1;
}
.dns-node em{
  display:block;font-style:normal;font-size:11.5px;color:var(--ink-faint);
  margin-top:4px;letter-spacing:.04em;
}
.dns-node--end{
  background:var(--dark);color:#EDE7DA;border-color:var(--dark);
}
.dns-node--end em{color:#A49C8C}
.dns-arrow{color:var(--earth);font-size:22px;flex:none}

/* 5. 防丢失深色区 */
.dn-loss-section{background:var(--dark)}
.dn-loss-section .section-title{color:#EFE9DC}
.dn-loss-cases{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:36px;
}
.dn-loss-case{
  background:var(--dark-soft);padding:28px 24px;
  border-left:3px solid var(--brown-light);
}
.dn-loss-case h3{
  color:#EDE7DA;font-size:16.5px;margin-bottom:12px;
}
.dn-loss-case p{
  color:#B9B1A2;font-size:13.5px;line-height:1.85;
}
.dn-loss-rule{
  background:rgba(174,135,73,.12);border:1px solid rgba(174,135,73,.3);
  padding:30px 34px;border-radius:var(--radius);
}
.dn-loss-rule h3{color:var(--earth-light);font-size:18px;margin-bottom:14px}
.dn-loss-rule ul{display:flex;flex-direction:column;gap:10px}
.dn-loss-rule li{
  color:#D8D2C6;font-size:14px;line-height:1.8;
  padding-left:20px;position:relative;
}
.dn-loss-rule li::before{
  content:"";position:absolute;left:0;top:11px;
  width:8px;height:2px;background:var(--earth);
}

/* 6. 转入 */
.dn-transfer-wrap{
  display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:center;
}
.dn-transfer-copy .lead{margin-bottom:22px}
.dn-transfer-list{
  display:flex;flex-direction:column;gap:12px;margin-bottom:26px;
}
.dn-transfer-list li{
  display:flex;gap:10px;align-items:flex-start;
  font-size:14px;color:var(--ink-soft);line-height:1.8;
}
.dn-transfer-list svg{width:18px;height:18px;fill:var(--earth);flex:none;margin-top:5px}
.dn-transfer-photo img{
  width:100%;border-radius:var(--radius);filter:saturate(.9);
}

/* 7. FAQ */
.dn-faq-section{background:var(--paper-deep)}
.dn-faq-list{max-width:880px;margin:0 auto}

/* 8. 相关 */
.dn-related-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
}
.dn-related{
  background:var(--paper);border:1px solid var(--line);
  padding:26px 22px;transition:all .3s ease;
}
.dn-related:hover{transform:translateY(-4px);border-color:var(--earth);box-shadow:var(--shadow)}
.dn-related-no{
  display:inline-block;font-family:var(--font-serif);
  font-size:14px;color:var(--earth-deep);margin-bottom:10px;
  border:1px solid var(--earth);padding:2px 10px;
}
.dn-related h3{font-size:16.5px;margin-bottom:8px}
.dn-related p{font-size:13px;color:var(--ink-soft);line-height:1.8}

/* 9. CTA */
.dn-cta-section{
  background:
    linear-gradient(135deg, rgba(42,38,32,.93), rgba(58,53,44,.93)),
    url("../images/banner-server.jpg") center/cover no-repeat;
  color:#EDE7DA;
}
.dn-cta-wrap{
  display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center;
}
.dn-cta-title{
  font-size:clamp(24px,3.2vw,36px);color:#EFE9DC;line-height:1.45;margin-bottom:14px;
}
.dn-cta-sub{font-size:14.5px;color:#C9C1B2;margin-bottom:24px}
.dn-cta-contacts{display:flex;gap:12px;flex-wrap:wrap}
.dn-cta-contact{
  display:inline-flex;align-items:center;gap:10px;
  background:rgba(255,255,255,.08);border:1px solid rgba(201,193,178,.25);
  padding:11px 16px;border-radius:var(--radius);
}
.dn-cta-contact:hover{background:var(--earth);border-color:var(--earth)}
.dn-cta-contact svg{width:16px;height:16px;fill:var(--earth-light)}
.dn-cta-contact:hover svg{fill:#fff}
.dn-cta-contact span{display:flex;flex-direction:column;font-size:13.5px;color:#EDE7DA}
.dn-cta-contact small{font-size:10.5px;color:#A49C8C;letter-spacing:.18em}
.dn-cta-btn{justify-self:end}

/* 响应式 */
@media (max-width:991px){
  .dn-hero-inner,.dn-dns-wrap,.dn-transfer-wrap,.dn-cta-wrap{grid-template-columns:1fr;gap:36px}
  .dn-tld-grid,.dn-loss-cases{grid-template-columns:1fr}
  .dn-steps{grid-template-columns:1fr 1fr}
  .dn-related-grid{grid-template-columns:1fr 1fr}
  .dn-cta-btn{justify-self:stretch;text-align:center}
}
@media (max-width:640px){
  .dn-steps,.dn-related-grid{grid-template-columns:1fr}
}

/* 正文内联链接 */
.dark-link{color:var(--earth-light);border-bottom:1px solid rgba(201,168,105,.4)}
.dark-link:hover{color:#fff;border-bottom-color:#fff}
.inline-link{color:var(--earth-deep);border-bottom:1px solid var(--line)}
.inline-link:hover{color:var(--earth);border-bottom-color:var(--earth)}