/* =========================================================
   启博指南 · 共享样式表 /assets/site.css
   框架式导航 + 海报式分层 + 信号橙锚点
   ========================================================= */

:root{
  --ink:#101A24;
  --ink-2:#1B2A38;
  --slate:#33465A;
  --mist:#F4F7F8;
  --line:#D3DBE0;
  --orange:#FF6A2B;
  --teal:#2FBF9B;
  --amber:#F2B531;
  --red:#E5484D;
  --deep-text:#0B1219;
  --rail:14px;
  --wrap:1180px;
  --sp:clamp(16px,4vw,40px);
  --radius-lg:20px;
  --radius-md:14px;
  --radius-pill:999px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
  --shadow:0 20px 44px -30px rgba(16,26,36,.6);
}

/* ---------- 1. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:140px;
}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  color:var(--ink-2);
  background:var(--mist);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
img,svg,video{display:block;max-width:100%}
[hidden]{display:none !important}
strong,b{font-weight:800}

/* ---------- 2. 框架式侧轨（形状与材质：连续细线） ---------- */
@media (min-width:1180px){
  body{padding-left:var(--rail);padding-right:var(--rail)}
  body::before,
  body::after{
    content:"";
    position:fixed;
    top:0;
    bottom:0;
    width:var(--rail);
    z-index:40;
    background-color:var(--ink);
    background-image:repeating-linear-gradient(to bottom,rgba(244,247,248,.22) 0 1px,transparent 1px 36px);
    pointer-events:none;
  }
  body::before{left:0}
  body::after{right:0}
}

/* ---------- 3. 焦点与动效偏好 ---------- */
:focus-visible{
  outline:3px solid var(--orange);
  outline-offset:3px;
  border-radius:6px;
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

/* ---------- 4. 头部框架 ---------- */
.skip-link{
  position:absolute;
  left:10px;
  top:-72px;
  z-index:120;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  background:var(--orange);
  color:var(--deep-text);
  font-size:14px;
  font-weight:800;
  letter-spacing:.02em;
  transition:top .18s ease-out;
}
.skip-link:focus{top:10px}

.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:var(--ink);
  color:var(--mist);
  border-bottom:1px solid rgba(244,247,248,.14);
  box-shadow:0 12px 30px -26px rgba(0,0,0,.9);
}
.site-header.is-scrolled{box-shadow:0 18px 40px -24px rgba(0,0,0,.95)}

.site-header__bar{
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--sp);
  min-height:72px;
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,28px);
}

.brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto}
.brand__mark{
  width:16px;height:16px;
  border-radius:5px;
  background:var(--orange);
  box-shadow:0 0 0 5px rgba(255,106,43,.16);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-size:19px;font-weight:800;letter-spacing:.05em}
.brand__line{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;color:rgba(244,247,248,.5)}

.site-nav{flex:1 1 auto;min-width:0}
.site-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.site-nav__item{flex:0 0 auto}
.site-nav__link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 11px;
  border-radius:var(--radius-pill);
  font-size:14.5px;
  line-height:1.4;
  color:rgba(244,247,248,.76);
  white-space:nowrap;
  border-bottom:2px solid transparent;
  transition:color .18s ease-out,background-color .18s ease-out,border-color .18s ease-out;
}
.site-nav__link:hover{color:#fff;background:rgba(244,247,248,.09)}
.site-nav__link[aria-current="page"]{
  color:#fff;
  background:rgba(255,106,43,.14);
  border-bottom-color:var(--orange);
}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--orange)}
.site-nav__index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:rgba(244,247,248,.38);
}
.site-nav__foot{display:none}
.site-nav__meta{margin:0;font-size:12.5px;color:rgba(244,247,248,.5)}

.header-actions{
  display:flex;
  align-items:center;
  gap:8px;
  margin-left:auto;
  flex:0 0 auto;
}

/* ---------- 5. 按钮体系 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--mist);
  --btn-bd:transparent;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border-radius:var(--radius-pill);
  border:1px solid var(--btn-bd);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-sans);
  font-size:14.5px;
  font-weight:600;
  letter-spacing:.02em;
  text-align:center;
  cursor:pointer;
  transition:transform .18s ease-out,background-color .18s ease-out,border-color .18s ease-out,color .18s ease-out;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{
  --btn-bg:var(--orange);
  --btn-fg:var(--deep-text);
  --btn-bd:var(--orange);
  font-weight:800;
}
.btn--primary:hover{--btn-bg:#FF7C44;--btn-bd:#FF7C44}
.btn--ghost{--btn-bd:rgba(244,247,248,.34);--btn-fg:rgba(244,247,248,.86)}
.btn--ghost:hover{--btn-bd:var(--orange);--btn-fg:#fff}
.btn--sm{padding:8px 14px;font-size:13.5px}
.btn--block{width:100%}
.btn__icon{width:9px;height:9px;border-radius:2px;background:currentColor;opacity:.72}
.btn__label{white-space:nowrap}
.btn[aria-pressed="true"]{--btn-bd:var(--teal);--btn-fg:var(--teal)}

/* ---------- 6. 头部状态行与滚动进度 ---------- */
.site-header__status{
  border-top:1px solid rgba(244,247,248,.1);
  background:rgba(27,42,56,.72);
}
.status-line{
  max-width:var(--wrap);
  margin:0 auto;
  padding:7px var(--sp);
  display:flex;
  flex-wrap:wrap;
  gap:6px clamp(14px,3vw,36px);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:rgba(244,247,248,.6);
}
.status-line__seg{display:inline-flex;align-items:baseline}
.status-line__key{color:var(--orange);margin-right:7px;letter-spacing:.14em}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:rgba(244,247,248,.12);
}
.scroll-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:var(--orange);
  transition:width .12s linear;
}

/* ---------- 7. 汉堡按钮 ---------- */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 14px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(244,247,248,.34);
  background:transparent;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  cursor:pointer;
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  display:block;
  width:16px;height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .2s ease-out,background-color .2s ease-out,top .2s ease-out;
}
.nav-toggle__bars{position:relative}
.nav-toggle__bars::before{content:"";position:absolute;left:0;top:-5px}
.nav-toggle__bars::after{content:"";position:absolute;left:0;top:5px}
.nav-toggle.is-active .nav-toggle__bars{background:transparent}
.nav-toggle.is-active .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle.is-active .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle__text{white-space:nowrap}

/* ---------- 8. 移动 / 平板导航抽屉 ---------- */
@media (max-width:1100px){
  .nav-toggle{display:inline-flex}
  .header-actions__cta{display:none}
  html.nav-open,
  html.nav-open body{overflow:hidden}
  .site-nav{
    position:fixed;
    inset:0;
    z-index:45;
    display:flex;
    flex-direction:column;
    padding:118px var(--sp) 32px;
    background:var(--ink);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s ease-out,transform .24s ease-out,visibility .24s;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:none}
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    border-top:1px solid rgba(244,247,248,.12);
  }
  .site-nav__item{border-bottom:1px solid rgba(244,247,248,.12)}
  .site-nav__link{
    width:100%;
    justify-content:flex-start;
    padding:17px 4px;
    font-size:20px;
    font-weight:800;
    border-radius:0;
    border-bottom:0;
    letter-spacing:-.01em;
  }
  .site-nav__link[aria-current="page"]{background:transparent;color:var(--orange)}
  .site-nav__index{font-size:12px;letter-spacing:.14em}
  .site-nav__foot{
    display:flex;
    flex-direction:column;
    gap:12px;
    margin-top:auto;
    padding-top:30px;
  }
}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--ink);
  color:var(--mist);
}
.footer__grid{
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(40px,6vw,68px) var(--sp) clamp(26px,4vw,42px);
  display:grid;
  grid-template-columns:1.05fr 1fr 1.25fr 1fr;
  gap:clamp(24px,3vw,44px);
}
.footer__col{min-width:0}
.footer__title{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--orange);
  margin-bottom:16px;
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  font-size:14.5px;
  color:rgba(244,247,248,.74);
  border-bottom:1px solid transparent;
  transition:color .18s ease-out,border-color .18s ease-out;
}
.footer__link:hover{color:var(--orange);border-bottom-color:var(--orange)}
.footer__contact{
  font-size:14px;
  line-height:1.7;
  color:rgba(244,247,248,.74);
  word-break:break-word;
}
.footer__key{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(244,247,248,.42);
  margin-right:8px;
}
.footer__note{
  margin-top:16px;
  padding-left:11px;
  border-left:2px solid rgba(255,106,43,.65);
  font-size:12.5px;
  line-height:1.7;
  color:rgba(244,247,248,.52);
}
.footer__actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.site-footer .btn--ghost{--btn-bd:rgba(255,106,43,.6);--btn-fg:var(--orange)}
.site-footer .btn--ghost:hover{--btn-bd:var(--orange);--btn-fg:#fff;background:rgba(255,106,43,.16)}
.footer__bottom{
  max-width:var(--wrap);
  margin:0 auto;
  padding:18px var(--sp) 28px;
  border-top:1px solid rgba(244,247,248,.12);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
}
.footer__slogan{font-size:15px;font-weight:800;letter-spacing:.02em}
.footer__legal{
  display:flex;
  flex-wrap:wrap;
  gap:8px 18px;
  font-family:var(--font-mono);
  font-size:11.5px;
  color:rgba(244,247,248,.5);
}

/* ---------- 10. 页面容器与章节节奏 ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding-left:var(--sp);
  padding-right:var(--sp);
}
.wrap--narrow{max-width:820px}
.section{padding-top:clamp(40px,6vw,80px);padding-bottom:clamp(40px,6vw,80px)}
.section--tight{padding-top:clamp(22px,3.4vw,40px);padding-bottom:clamp(22px,3.4vw,40px)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px 26px;
  margin-bottom:clamp(20px,3vw,34px);
  padding-bottom:15px;
  border-bottom:1px solid var(--line);
}
.section-head__title{
  font-size:clamp(24px,3vw,34px);
  line-height:1.25;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--ink);
}
.section-head__note{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--slate);
  opacity:.85;
}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 13px;
  border-radius:var(--radius-pill);
  background:rgba(255,106,43,.1);
  color:var(--orange);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb{padding-top:20px}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
}
.breadcrumb__item{display:flex;align-items:center;color:var(--slate)}
.breadcrumb__item + .breadcrumb__item::before{content:"/";margin:0 10px;color:var(--line)}
.breadcrumb__link{color:var(--slate);border-bottom:1px solid transparent}
.breadcrumb__link:hover{color:var(--orange);border-bottom-color:currentColor}
.breadcrumb__item[aria-current="page"]{color:var(--ink);font-weight:700}

/* ---------- 12. 长阅读容器 ---------- */
.prose{max-width:62ch;font-size:17px;line-height:1.85;color:var(--ink-2)}
.prose > * + *{margin-top:1.1em}
.prose h2{
  margin-top:2em;
  font-size:clamp(22px,2.6vw,28px);
  line-height:1.35;
  letter-spacing:-.01em;
  color:var(--ink);
}
.prose h3{margin-top:1.6em;font-size:19px;color:var(--ink)}
.prose a{color:var(--ink);border-bottom:2px solid var(--orange)}
.prose strong{color:var(--ink)}
.prose ul,.prose ol{padding-left:1.3em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.5em}
.prose li::marker{color:var(--orange);font-family:var(--font-mono);font-weight:700}
.prose blockquote{
  margin:1.6em 0;
  padding:4px 0 4px 18px;
  border-left:3px solid var(--orange);
  color:var(--slate);
}

/* ---------- 13. 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width:900px){
  .grid--7-5,.grid--5-7,.grid--3,.grid--2{grid-template-columns:1fr}
}

/* ---------- 14. 卡片 ---------- */
.card{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:clamp(18px,2.4vw,26px);
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
}
.card__head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.card__title{font-size:19px;font-weight:800;letter-spacing:-.01em;color:var(--ink)}
.card__body{font-size:15.5px;line-height:1.8;color:var(--slate)}
.card__foot{margin-top:auto;padding-top:12px;border-top:1px dashed var(--line)}

/* ---------- 15. 编号步骤 ---------- */
.step{display:grid;grid-template-columns:auto 1fr;gap:clamp(14px,2vw,22px);align-items:start}
.step__num{
  font-family:var(--font-mono);
  font-size:clamp(40px,5vw,64px);
  line-height:.9;
  font-weight:700;
  letter-spacing:-.05em;
  color:var(--orange);
}
.step__body{min-width:0}

/* ---------- 16. 时间轴 ---------- */
.timeline{position:relative;display:flex;flex-direction:column;gap:clamp(18px,3vw,32px);padding-left:26px}
.timeline::before{
  content:"";
  position:absolute;
  left:6px;top:6px;bottom:6px;
  width:2px;
  background:var(--line);
}
.timeline__item{position:relative}
.timeline__dot{
  position:absolute;
  left:-26px;top:6px;
  width:14px;height:14px;
  border-radius:50%;
  background:var(--mist);
  border:3px solid var(--slate);
}
.timeline__item[data-state="active"] .timeline__dot{border-color:var(--orange)}
.timeline__item[data-state="ok"] .timeline__dot{border-color:var(--teal)}
.timeline__item[data-state="wait"] .timeline__dot{border-color:var(--amber)}
.timeline__body{padding-bottom:2px}

/* ---------- 17. 状态标签与筛选胶囊 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border-radius:var(--radius-pill);
  background:var(--slate);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
}
.tag--brand{background:var(--orange);color:var(--deep-text)}
.tag--ok{background:var(--teal);color:var(--deep-text)}
.tag--wait{background:var(--amber);color:var(--deep-text)}
.tag--alert{background:var(--red);color:#fff}

.chip{
  padding:8px 16px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:#fff;
  color:var(--slate);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  cursor:pointer;
  transition:background-color .18s ease-out,color .18s ease-out,border-color .18s ease-out;
}
.chip:hover{border-color:var(--slate);color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--mist)}

/* ---------- 18. 视觉容器（供页面阶段放置图片或占位） ---------- */
.media-frame{
  position:relative;
  display:flex;
  align-items:flex-end;
  aspect-ratio:4 / 3;
  border:1px solid var(--slate);
  border-radius:var(--radius-lg);
  overflow:hidden;
  background:var(--ink-2);
}
.media-frame--wide{aspect-ratio:16 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame__grid{
  position:absolute;
  inset:0;
  background-color:var(--ink-2);
  background-image:
    radial-gradient(circle at 32% 28%,rgba(47,191,155,.22),transparent 56%),
    radial-gradient(circle at 78% 74%,rgba(255,106,43,.18),transparent 58%),
    linear-gradient(rgba(244,247,248,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(244,247,248,.07) 1px,transparent 1px);
  background-size:auto,auto,28px 28px,28px 28px;
}
.media-frame__img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__caption{
  position:relative;
  z-index:1;
  width:100%;
  padding:14px 16px;
  background:linear-gradient(to top,rgba(16,26,36,.88),rgba(16,26,36,0));
  color:rgba(244,247,248,.76);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
}
@media (max-width:640px){
  .media-frame,.media-frame--wide,.media-frame--tall{aspect-ratio:4 / 3}
}

/* ---------- 19. 进入动画 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .24s ease-out,transform .24s ease-out;
}
[data-reveal].is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  [data-reveal]{opacity:1;transform:none;transition:none}
}

/* ---------- 20. 响应式收尾 ---------- */
@media (max-width:900px){
  body{font-size:16.5px;line-height:1.8}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__bottom{flex-direction:column;align-items:flex-start}
}
@media (max-width:640px){
  .brand__line{display:none}
  .status-line{font-size:11px}
  .status-line__seg:nth-child(3){display:none}
  .footer__grid{grid-template-columns:1fr}
  .footer__legal{gap:6px 14px}
}