:root{
  --ink:#131829;
  --paper:#F5F6F8;
  --white:#fff;
  --live:#E8344E;
  --ok:#0B7D6C;
  --slate:#5C6478;
  --slate-2:#8A93A6;
  --line:#E2E5EA;
  --line-2:#EDEFF3;

  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",
         "PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --shell:52em;   /* 外层容器：表格、规格栏可用满 */
  --prose:38em;   /* 正文行长 */

  /* 字阶：只保留 5 级，避免出现一堆相近字号 */
  --t-xs:.8125rem;
  --t-sm:.9375rem;
  --t-md:1rem;
  --t-h2:1.375rem;
  --t-h1:clamp(2rem,6vw,2.875rem);

  /* 中文不加负字距；负字距只给拉丁标题 */
  --track-cjk:0;
  --track-latin:-.022em;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:var(--track-cjk);
  font-feature-settings:"kern" 1;
  font-synthesis-weight:none;     /* 禁止合成粗体，中文假粗最毁整齐感 */
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
html[lang="en"] body{line-height:1.65}
html[lang="en"]{--prose:36em}
::selection{background:rgba(232,52,78,.16)}

.wrap{max-width:var(--shell);margin-inline:auto;padding-inline:24px}
.prose{max-width:var(--prose)}

a{color:var(--ink);text-decoration-thickness:1px;text-decoration-color:rgba(232,52,78,.55);
  text-underline-offset:3px;transition:text-decoration-color .15s}
a:hover{text-decoration-color:var(--live)}
:focus-visible{outline:2px solid var(--live);outline-offset:3px;border-radius:2px}

/* ══════════ 头部 ══════════ */
.hero{
  position:relative;
  background:var(--ink);
  color:#fff;
  padding-bottom:72px;
  overflow:hidden;
}
.hero::before{                       /* 极淡的网格，给暗场一点质感 */
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:38px 38px;
  mask-image:radial-gradient(80% 60% at 50% 0%,#000,transparent 75%);
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(52% 58% at 50% -6%,rgba(232,52,78,.30),transparent 68%);
}
.hero > .wrap{position:relative;z-index:1}

.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:20px 0}
.brand{font-weight:800;letter-spacing:var(--track-latin);font-size:1.06rem;color:#fff;text-decoration:none}
.brand b{color:var(--live)}
.brand:hover{text-decoration:none}
.langs{display:flex;gap:2px;background:rgba(255,255,255,.08);border-radius:999px;padding:3px;
  border:1px solid rgba(255,255,255,.08)}
.langs a{font-size:var(--t-xs);font-weight:600;line-height:1.2;color:rgba(255,255,255,.66);
  text-decoration:none;padding:5px 12px;border-radius:999px;transition:color .15s,background .15s}
.langs a:hover{color:#fff}
.langs a[aria-current]{background:#fff;color:var(--ink)}

.kicker{
  display:inline-flex;align-items:center;gap:9px;
  margin:44px 0 20px;font-size:var(--t-xs);font-weight:600;line-height:1.5;
  color:rgba(255,255,255,.62);
}
.dot{width:7px;height:7px;border-radius:50%;background:var(--live);animation:pulse 2.6s ease-out infinite}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(232,52,78,.5)}
  70%{box-shadow:0 0 0 8px rgba(232,52,78,0)}
  100%{box-shadow:0 0 0 0 rgba(232,52,78,0)}
}

/* ── 全页唯一的主角：地址栏与自动补全 ── */
.omni{
  max-width:30em;
  color:var(--ink);            /* hero 的白色字不能继承进这个白底组件 */
  background:var(--white);
  border-radius:15px;
  box-shadow:0 1px 0 rgba(255,255,255,.5) inset,
             0 18px 44px -14px rgba(0,0,0,.6),
             0 2px 6px rgba(0,0,0,.25);
}
.bar{
  display:flex;align-items:center;gap:11px;
  padding:14px 17px;
  border-bottom:1px solid var(--line-2);
}
.lock{flex:none;width:14px;height:14px;color:var(--ok)}
.url{
  font-family:var(--mono);font-size:clamp(1.02rem,3.9vw,1.2rem);
  color:var(--ink);white-space:nowrap;overflow:hidden;
}
.url .dim{color:var(--slate-2)}
.tld{
  display:inline-block;overflow:hidden;vertical-align:bottom;white-space:nowrap;
  width:3ch;border-right:1.5px solid var(--live);
  animation:type .9s steps(3,end) .4s both, caret .8s step-end 5 1.3s;
}
@keyframes type{from{width:0}to{width:3ch}}
@keyframes caret{50%{border-right-color:transparent}}

.suggest{list-style:none;margin:0;padding:6px;font-size:var(--t-sm);line-height:1.5}
.suggest li{
  display:flex;align-items:center;gap:10px;
  padding:9px 11px;border-radius:9px;
  opacity:0;animation:drop .45s ease-out both;
}
.suggest li:nth-child(1){animation-delay:1.35s;background:rgba(232,52,78,.07)}
.suggest li:nth-child(2){animation-delay:1.5s}
@keyframes drop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.suggest .glyph{flex:none;width:15px;height:15px;color:var(--slate-2)}
.suggest li:nth-child(1) .glyph{color:var(--live)}
.suggest .d{font-family:var(--mono);font-weight:600;color:var(--ink)}
.suggest .tag{
  margin-left:auto;font-size:var(--t-xs);font-weight:600;line-height:1.5;
  padding:2px 8px;border-radius:999px;
  background:var(--line-2);color:var(--slate);
}
.suggest li:nth-child(1) .tag{background:var(--live);color:#fff}

h1{
  font-size:var(--t-h1);
  line-height:1.3;font-weight:800;
  margin:40px 0 0;text-wrap:balance;
}
html[lang="en"] h1{line-height:1.12;letter-spacing:var(--track-latin)}
.dek{
  max-width:var(--prose);
  margin:20px 0 0;color:rgba(255,255,255,.72);text-wrap:pretty;
}

/* ══════════ 正文 ══════════ */
main{padding-block:14px 56px}
section{padding-block:40px;border-top:1px solid var(--line)}
section:first-child{border-top:0}
h2{
  font-size:var(--t-h2);line-height:1.45;font-weight:700;
  margin:0 0 20px;text-wrap:balance;
}
html[lang="en"] h2{line-height:1.25;letter-spacing:var(--track-latin)}
p{margin:0 0 16px;text-wrap:pretty;max-width:var(--prose)}
p:last-child{margin-bottom:0}
strong{font-weight:700}

.u{font-family:var(--mono);font-size:.88em;line-height:1;
  background:#EDEFF4;color:#6E7789;border-radius:5px;
  padding:.16em .42em;white-space:nowrap;vertical-align:baseline}
.u.next{background:rgba(232,52,78,.1);color:#AF1329;font-weight:600;
  box-shadow:inset 0 0 0 1px rgba(232,52,78,.16)}
a.u{text-decoration:none}
a.u:hover{text-decoration:underline;text-decoration-color:currentColor}
.map .to a{text-decoration:none;color:inherit}
.map .to a:hover{text-decoration:underline;text-decoration-color:var(--live)}
.hero .u{background:rgba(255,255,255,.07);color:rgba(255,255,255,.5);box-shadow:none}
.hero .u.next{background:rgba(232,52,78,.28);color:#FFD2D9;
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.14)}

/* 地址映射 */
.map{margin:4px 0 0}
.map div{
  display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;
  padding:14px 0;border-bottom:1px solid var(--line-2);
}
.map div:first-child{border-top:1px solid var(--line-2)}
.map .what{flex:none;width:7em;font-size:var(--t-xs);color:var(--slate);line-height:1.7}
/* 旧域名：浅色退到背景；新域名：本页重点 */
.map .from{font-family:var(--mono);font-size:var(--t-sm);font-weight:400;color:#7F8899}
.map .plus{color:#C3C9D4;font-size:var(--t-sm);font-weight:400}
.map .to{font-family:var(--mono);font-size:var(--t-md);font-weight:700;
  color:var(--ink);background:rgba(232,52,78,.09);border-radius:6px;padding:2px 8px;
  box-shadow:inset 0 0 0 1px rgba(232,52,78,.16)}
.map .to a{color:inherit}

.note{
  margin-top:14px;padding-left:14px;border-left:2px solid var(--line);
  font-size:var(--t-xs);color:var(--slate);max-width:var(--prose);
}

/* 理由：左栏标题 + 右栏说明 */
.why{display:grid;gap:0}
.why > div{
  display:grid;grid-template-columns:12.5em 1fr;gap:0 28px;
  padding:20px 0;border-bottom:1px solid var(--line-2);
}
.why > div:first-child{border-top:1px solid var(--line-2)}
.why h3{
  font-size:var(--t-md);font-weight:700;margin:0;line-height:1.6;
  text-wrap:balance;
}
.why > div > :not(h3){grid-column:2}   /* 说明与注释都留在右栏，不回到标题列 */
.why p{margin:0;font-size:var(--t-sm);max-width:none;color:#2B3247}
.why .note{margin-top:12px}

/* 对照表 */
.tablewrap{overflow-x:auto;margin-top:6px;
  -webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;min-width:30em;font-size:var(--t-sm);line-height:1.7;
  font-variant-numeric:tabular-nums}
caption{text-align:left;color:var(--slate);font-size:var(--t-sm);
  padding-bottom:18px;max-width:var(--prose)}
th,td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--line-2);vertical-align:top}
th:first-child,td:first-child{padding-left:0}
thead th{font-family:var(--mono);font-size:var(--t-sm);font-weight:700;
  border-bottom:1px solid var(--ink);white-space:nowrap;padding-bottom:10px}
tbody th{font-weight:600;color:var(--slate);font-size:var(--t-xs);white-space:nowrap}
.same{color:#7F8899}
tbody td:nth-child(2){color:#7F8899}
/* 新域名整列轻微提亮，表头压一条红线 */
thead th:nth-child(2){color:#7F8899;font-weight:400}
thead th:last-child{box-shadow:inset 0 -3px 0 var(--live);color:var(--live)}
td:last-child{background:rgba(232,52,78,.045);color:var(--ink)}
td:last-child.same{color:var(--slate)}
tbody tr:last-child td{border-bottom:0}
.win{font-weight:600}

/* 问答 */
.faq > div{padding:18px 0;border-bottom:1px solid var(--line-2)}
.faq > div:first-child{border-top:1px solid var(--line-2)}
.faq > div:last-child{border-bottom:0}
.faq .q{font-weight:700;margin:0 0 7px}
.faq .a{font-size:var(--t-sm);margin:0;color:#2B3247}

  display:block;margin-bottom:10px}
.sig b{color:var(--live)}

@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding-inline:20px}
  .why > div{grid-template-columns:1fr;gap:9px}
  .why > div > :not(h3){grid-column:1}
  .map .what{width:100%}
  .omni{max-width:none}

  /* 窄屏不横向滚动：每一行拆成「项目 + 两条对照」的纵向条目 */
  .tablewrap{overflow-x:visible}
  table{min-width:0;display:block}
  caption{display:block;width:auto;max-width:none}   /* display:block 的表里 caption 会塌成一字宽 */
  thead{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}
  tbody{display:block}
  tbody tr{display:block;padding:16px 0;border-bottom:1px solid var(--line-2)}
  tbody tr:last-child{border-bottom:0}
  tbody th{display:block;padding:0 0 9px;font-size:var(--t-xs);color:var(--slate);white-space:normal}
  tbody td{
    display:grid;grid-template-columns:6.2em 1fr;align-items:baseline;gap:12px;
    padding:4px 0;border:0;background:none;
  }
  tbody td::before{
    content:attr(data-col);
    font-family:var(--mono);font-size:var(--t-xs);color:#7F8899;
  }
  tbody td:last-child{color:var(--ink);font-weight:600}
  tbody td:last-child::before{color:var(--live)}
  tbody td.same,tbody td:nth-child(2){color:#7F8899}
  tbody td:last-child.same{color:var(--slate);font-weight:400}
}
@media (prefers-reduced-motion:reduce){
  .tld{animation:none;border-right-color:transparent}
  .suggest li{animation:none;opacity:1}
  .dot{animation:none}
}