:root{
  --red:#C8102E;
  --red-deep:#A20D25;
  --red-soft:#F6D6DB;
  --navy:#0E2A47;
  --navy-mid:#1D4E79;
  --mist:#DCE7F2;
  --cream:#F6F1E7;
  --green:#17B890;
  --ink:#2B2F36;
  --gray:#6B7280;
  --white:#FFFFFF;
  --line:rgba(14,42,71,.12);
  --rail-w:88px;
  --maxw:1240px;
  --r-xl:32px;
  --r-lg:26px;
  --r-md:20px;
  --r-pill:999px;
  --ease:cubic-bezier(.22,.9,.28,1);
  --dur:240ms;
  --shadow-panel:0 18px 44px -30px rgba(14,42,71,.5);
  --font-display:"Noto Sans SC","PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,Menlo,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:separate;border-spacing:0}
:focus-visible{outline:3px solid var(--red);outline-offset:3px;border-radius:8px}
.rail :focus-visible{outline-color:var(--green)}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background:var(--cream);
  letter-spacing:.01em;
  min-height:100vh;
  padding-left:0;
}
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  color:var(--navy);
  font-weight:800;
  line-height:1.28;
  letter-spacing:-.02em;
}
h1{font-size:clamp(36px,7vw,72px);line-height:1.06}
h2{font-size:clamp(26px,4vw,44px);line-height:1.12}
h3{font-size:clamp(20px,2.4vw,28px);letter-spacing:-.01em}
h4{font-size:18px;font-weight:700}
p{max-width:38em}
strong{font-weight:700;color:var(--navy)}
a:hover{color:var(--red)}

.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

.skip-link{
  position:fixed;left:16px;top:-96px;z-index:200;
  display:inline-flex;align-items:center;
  padding:12px 22px;border-radius:var(--r-pill);
  background:var(--navy);color:#fff;font-size:14px;font-weight:700;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:16px;color:#fff}

/* ---------- 品牌条 ---------- */
.masthead{position:relative;z-index:60}
.masthead__bar{
  position:sticky;top:0;z-index:60;
  display:flex;align-items:center;gap:14px;
  min-height:68px;
  padding:12px clamp(16px,3vw,40px);
  background:rgba(246,241,231,.92);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:11px;margin-right:auto;min-width:0}
.brand__mark{
  position:relative;flex:none;
  width:42px;height:42px;border-radius:14px;
  background:var(--navy);color:#fff;
  display:grid;place-items:center;
  font-family:var(--font-mono);font-size:14px;font-weight:700;letter-spacing:.02em;
}
.brand__mark::after{
  content:"";position:absolute;right:-3px;top:-3px;
  width:10px;height:10px;border-radius:50%;
  background:var(--green);border:2px solid var(--cream);
}
.brand__text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.brand__name{
  font-family:var(--font-display);font-size:19px;font-weight:800;
  color:var(--navy);letter-spacing:-.02em;white-space:nowrap;
}
.brand__tagline{font-size:12px;color:var(--gray);white-space:nowrap}
@media (max-width:639px){.brand__tagline{display:none}}

.masthead__actions{display:flex;align-items:center;gap:10px;flex:none}

.version-chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:6px 12px;border-radius:var(--r-pill);
  background:var(--red-soft);color:var(--red);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.02em;
}
.version-chip__label{font-family:var(--font-body);font-size:11px;opacity:.75}
.version-chip__num{display:inline-flex;align-items:center}
.version-chip__sep{opacity:.55}
.version-chip__part{position:relative;display:inline-block}
.version-chip__part::after{
  content:attr(data-part);
  position:absolute;left:50%;bottom:calc(100% + 10px);
  transform:translate(-50%,6px);
  padding:5px 10px;border-radius:10px;
  background:var(--navy);color:#fff;
  font-family:var(--font-body);font-size:11px;white-space:nowrap;
  opacity:0;pointer-events:none;
  transition:opacity 200ms var(--ease),transform 200ms var(--ease);
  z-index:5;
}
.version-chip__part:hover::after,
.version-chip__part:focus-visible::after{opacity:1;transform:translate(-50%,0)}
@media (max-width:620px){.version-chip{display:none}}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;border-radius:var(--r-pill);
  font-size:14px;font-weight:600;line-height:1.2;white-space:nowrap;
  border:1.5px solid transparent;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn--primary{background:var(--red);color:#fff}
.btn--primary:hover{background:var(--red-deep);color:#fff}
.btn--ghost{border-color:var(--navy-mid);color:var(--navy-mid);background:rgba(255,255,255,.6)}
.btn--ghost:hover{background:var(--mist);color:var(--navy)}
@media (max-width:900px){.masthead__actions .btn--ghost{display:none}}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 15px;border-radius:var(--r-pill);
  border:1.5px solid rgba(14,42,71,.18);
  color:var(--navy);font-size:13px;font-weight:600;
}
.nav-toggle:hover{background:var(--mist)}
.nav-toggle__bars{
  position:relative;display:block;width:16px;height:2px;border-radius:2px;
  background:currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:currentColor;transition:transform var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
@media (max-width:620px){
  .nav-toggle__text{display:none}
  .nav-toggle{padding:10px 12px}
}

.progress{
  position:absolute;left:0;right:0;bottom:-1px;height:3px;
  background:rgba(14,42,71,.08);overflow:hidden;
}
.progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--red) 0%,var(--red) 62%,var(--green) 100%);
  transition:transform 140ms linear;
}

/* ---------- 侧边轨道 / 抽屉 ---------- */
.rail{
  position:fixed;top:0;bottom:0;left:0;z-index:80;
  width:min(84vw,320px);
  display:flex;flex-direction:column;gap:10px;
  padding:22px 18px 26px;
  background:var(--navy);
  color:rgba(255,255,255,.82);
  transform:translateX(-102%);
  transition:transform 280ms var(--ease);
  overflow-y:auto;
  overscroll-behavior:contain;
}
.rail[data-open]{transform:translateX(0)}
.rail__head{
  display:flex;align-items:center;gap:12px;
  padding:2px 6px 16px;
  border-bottom:1px solid rgba(255,255,255,.14);
}
.rail__mark{
  flex:none;width:40px;height:40px;border-radius:14px;
  background:rgba(255,255,255,.12);color:#fff;
  display:grid;place-items:center;
  font-family:var(--font-mono);font-size:14px;font-weight:700;
}
.rail__head-text{display:flex;flex-direction:column;line-height:1.3}
.rail__head-name{font-family:var(--font-display);font-size:16px;font-weight:800;color:#fff}
.rail__head-note{font-size:12px;color:rgba(255,255,255,.6)}
.rail__list{display:flex;flex-direction:column;gap:4px;margin-top:6px;flex:1 1 auto}
.rail__link{
  display:flex;align-items:center;gap:14px;
  padding:12px 14px;border-radius:18px;
  color:rgba(255,255,255,.78);
  font-size:15px;font-weight:600;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.rail__num{
  flex:none;min-width:24px;
  font-family:var(--font-mono);font-size:12px;
  color:rgba(255,255,255,.45);letter-spacing:.06em;
}
.rail__label{color:inherit}
.rail__link:hover{background:rgba(255,255,255,.1);color:#fff}
.rail__link.is-active{box-shadow:inset 0 0 0 1.5px rgba(23,184,144,.75)}
.rail__link[aria-current="page"]{background:var(--red);color:#fff}
.rail__link[aria-current="page"] .rail__num{color:rgba(255,255,255,.85)}
.rail__foot{
  margin-top:auto;padding-top:16px;
  border-top:1px solid rgba(255,255,255,.14);
  display:flex;flex-direction:column;gap:12px;align-items:stretch;
}
.rail__version{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:rgba(255,255,255,.5);text-align:center;
}
.rail__cta{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 16px;border-radius:var(--r-pill);
  background:var(--red);color:#fff;font-size:14px;font-weight:700;
  transition:background var(--dur) var(--ease);
}
.rail__cta:hover{background:var(--red-deep);color:#fff}

.nav-scrim{
  position:fixed;inset:0;z-index:75;
  background:rgba(14,42,71,.55);
  opacity:0;visibility:hidden;
  transition:opacity 280ms var(--ease),visibility 280ms var(--ease);
}
.rail[data-open] ~ .nav-scrim{opacity:1;visibility:visible}

@media (min-width:1024px){
  .rail{
    width:var(--rail-w);
    transform:none;
    transition:none;
    align-items:center;
    gap:14px;
    padding:20px 0;
    overflow:visible;
  }
  .rail__head{padding:0 0 14px;border-bottom:0;justify-content:center}
  .rail__head-text{display:none}
  .rail__list{width:100%;align-items:center;gap:6px}
  .rail__link{
    position:relative;
    flex-direction:column;justify-content:center;gap:2px;
    width:60px;height:60px;padding:0;border-radius:20px;
  }
  .rail__num{min-width:0;font-size:11px;line-height:1;letter-spacing:.06em}
  .rail__label{
    position:absolute;left:68px;top:50%;
    transform:translate(-8px,-50%);
    padding:7px 13px;border-radius:var(--r-pill);
    background:#fff;color:var(--navy);
    font-size:13px;font-weight:700;white-space:nowrap;
    opacity:0;pointer-events:none;z-index:5;
    box-shadow:0 12px 30px -16px rgba(14,42,71,.7);
    transition:opacity 200ms var(--ease),transform 200ms var(--ease);
  }
  .rail__link:hover .rail__label,
  .rail__link:focus-visible .rail__label{opacity:1;transform:translate(0,-50%)}
  .rail__link:hover{background:rgba(255,255,255,.12);color:#fff}
  .rail__foot{width:100%;align-items:center;padding-top:14px}
  .rail__cta{display:none}
  .nav-scrim{display:none}
}

/* ---------- 通用布局 ---------- */
.wrap{
  width:100%;max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,44px);
}
.stack{display:flex;flex-direction:column;gap:clamp(24px,3.5vw,44px)}
.grid{display:grid;gap:clamp(18px,2.4vw,30px);grid-template-columns:1fr}
@media (min-width:768px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}
.split{display:grid;gap:clamp(22px,3vw,40px);grid-template-columns:1fr}
@media (min-width:1024px){
  .split{grid-template-columns:minmax(0,8fr) minmax(0,3fr);align-items:start}
}
.divider{height:1px;border:0;background:var(--line);margin:clamp(24px,3vw,40px) 0}

/* ---------- 面板与文本 ---------- */
.panel{
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--r-xl);
  padding:clamp(22px,3.4vw,44px);
  box-shadow:var(--shadow-panel);
}
.panel--mist{background:var(--mist);border-color:transparent}
.panel--red{background:var(--red-soft);border-color:transparent}
.panel--navy{background:var(--navy);border-color:transparent;color:rgba(255,255,255,.86)}
.panel--navy h2,.panel--navy h3,.panel--navy h4{color:#fff}
.panel--navy .eyebrow{background:rgba(255,255,255,.14);color:#fff}

.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 12px;border-radius:var(--r-pill);
  background:var(--red-soft);color:var(--red);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
}
.lead{font-size:clamp(17px,1.4vw,20px);line-height:1.75;color:var(--navy-mid);max-width:34em}
.prose{max-width:34em}
.prose p+p{margin-top:1em}
.prose h3{margin-bottom:10px}
.prose ul{margin-top:10px;display:flex;flex-direction:column;gap:8px}
.prose li{padding-left:18px;position:relative}
.prose li::before{
  content:"";position:absolute;left:0;top:.75em;
  width:8px;height:2px;background:var(--red);border-radius:2px;
}
.side-note{
  background:var(--mist);border-radius:var(--r-lg);
  padding:20px 22px;font-size:14px;line-height:1.75;color:var(--navy-mid);
}
.index-chip{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:34px;height:26px;padding:0 10px;border-radius:9px;
  background:var(--mist);color:var(--navy-mid);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
}
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:13px;color:var(--gray);
}
.breadcrumbs a{color:var(--navy-mid)}
.breadcrumbs a:hover{color:var(--red)}
.breadcrumbs__sep{opacity:.5}

/* ---------- 标签与状态 ---------- */
.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 14px;border-radius:var(--r-pill);
  background:var(--mist);color:var(--navy-mid);
  font-size:14px;font-weight:600;border:1px solid transparent;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.tag:hover{background:var(--red);color:#fff}
.tag--soft{background:var(--red-soft);color:var(--red)}
.tag.is-on,.tag[aria-pressed="true"]{background:var(--red);color:#fff}
.status{
  display:inline-flex;align-items:center;gap:7px;
  font-family:var(--font-mono);font-size:13px;font-weight:600;color:var(--gray);
}
.status::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--gray);flex:none}
.status--live{color:#0E7D63}
.status--live::before{background:var(--green)}
.status--review{color:#A86A00}
.status--review::before{background:#F0A62E}
.status--todo{color:var(--gray)}
.status--todo::before{background:#B9C2CE}

/* ---------- 对照表 ---------- */
.table-scroll{overflow-x:auto;border-radius:24px;-webkit-overflow-scrolling:touch}
.compare-table{
  width:100%;min-width:560px;font-size:15px;
  background:var(--white);
  border:1px solid var(--line);
  border-radius:24px;overflow:hidden;
}
.compare-table th{
  background:var(--navy);color:#fff;
  text-align:left;font-size:14px;font-weight:600;
  padding:14px 18px;white-space:nowrap;
}
.compare-table td{
  padding:14px 18px;border-top:1px solid var(--line);
  vertical-align:top;color:var(--ink);
}
.compare-table tbody tr:nth-child(even) td{background:rgba(220,231,242,.42)}
.compare-table tbody tr:hover td{background:var(--mist)}
.compare-table .is-mono{font-family:var(--font-mono);font-size:13px;color:var(--navy-mid)}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;display:block;width:100%;
  aspect-ratio:16/9;border-radius:var(--r-lg);
  overflow:hidden;background:var(--mist);
}
.media__img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--map{
  aspect-ratio:3/2;
  background:linear-gradient(150deg,var(--mist) 0%,var(--cream) 58%,var(--red-soft) 100%);
}
.media--map::after{
  content:"";position:absolute;inset:12%;
  border-radius:var(--r-md);
  border:2px dashed rgba(29,78,121,.35);
}
.media__caption{
  margin-top:10px;font-family:var(--font-mono);font-size:12px;color:var(--gray);
}

/* ---------- 行动元素 ---------- */
.pill-link{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border-radius:var(--r-pill);
  border:1.5px solid var(--navy-mid);color:var(--navy-mid);
  font-size:14px;font-weight:600;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.pill-link::after{content:"→";font-family:var(--font-mono)}
.pill-link:hover{background:var(--navy);border-color:var(--navy);color:#fff}

/* ---------- 页脚 ---------- */
.site-foot{
  margin-top:clamp(48px,7vw,96px);
  background:var(--navy);
  color:rgba(255,255,255,.78);
  padding-top:clamp(40px,6vw,72px);
}
.site-foot__inner{
  max-width:var(--maxw);margin:0 auto;
  padding:0 clamp(18px,4vw,44px) clamp(32px,4vw,48px);
  display:grid;gap:clamp(28px,3vw,44px);
  grid-template-columns:1fr;
}
@media (min-width:768px){
  .site-foot__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1100px){
  .site-foot__inner{grid-template-columns:1.1fr 2fr 1.35fr}
}
.foot-intro__brand{
  font-family:var(--font-display);font-size:20px;font-weight:800;
  color:#fff;letter-spacing:-.01em;
}
.foot-intro__line{margin-top:8px;font-size:14px;color:rgba(255,255,255,.72);max-width:24em}
.foot-intro__meta{margin-top:6px;font-size:12px;font-family:var(--font-mono);color:rgba(255,255,255,.5)}
.foot-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
@media (min-width:768px){.foot-nav{grid-template-columns:repeat(3,minmax(0,1fr))}}
.foot-col__title{
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;
  color:rgba(255,255,255,.55);margin-bottom:12px;
}
.foot-col__list{display:flex;flex-direction:column;gap:6px}
.foot-link{
  display:inline-block;padding:3px 0;font-size:15px;
  color:rgba(255,255,255,.86);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.foot-link:hover{color:#fff;border-bottom-color:var(--red)}
.foot-contact__note{margin-top:12px;font-size:12px;color:rgba(255,255,255,.5);max-width:26em}
.contact-list{display:flex;flex-direction:column;gap:12px}
.contact-list__item{display:flex;flex-direction:column;gap:6px}
.contact-list__key{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:rgba(255,255,255,.45);
}
.contact-list__value{font-size:14px;color:rgba(255,255,255,.82)}
.copy-btn{
  display:inline-flex;align-items:center;gap:10px;
  align-self:flex-start;max-width:100%;
  padding:7px 13px;border-radius:var(--r-pill);
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.16);
  color:#fff;font-family:var(--font-mono);font-size:13px;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.copy-btn:hover{background:rgba(23,184,144,.18);border-color:rgba(23,184,144,.5)}
.copy-btn__value{overflow-wrap:anywhere}
.copy-btn__hint{
  flex:none;font-family:var(--font-body);font-size:12px;
  color:rgba(255,255,255,.55);
}
.copy-btn.is-copied{border-color:rgba(23,184,144,.7)}
.copy-btn.is-copied .copy-btn__hint{color:var(--green)}
.site-foot__legal{
  max-width:var(--maxw);margin:0 auto;
  padding:18px clamp(18px,4vw,44px);
  border-top:1px solid rgba(255,255,255,.14);
  display:flex;flex-wrap:wrap;gap:8px 22px;
  font-size:13px;color:rgba(255,255,255,.6);
}
.legal__item{max-width:none}
.legal__item--mono{font-family:var(--font-mono);font-size:12px}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference){
  .js [data-reveal]{
    opacity:0;transform:translateY(12px);
    transition:opacity 480ms var(--ease),transform 480ms var(--ease);
  }
  .js [data-reveal].is-visible{opacity:1;transform:translateY(0)}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  html{scroll-behavior:auto}
  .rail{transition:none}
  .progress__bar{transition:none}
}