/* ============ 1. 设计令牌 ============ */
:root{
  --ink:#071A2B;
  --navy:#0B2740;
  --tide:#123A5A;
  --amber:#FF7A3D;
  --coral:#D9553F;
  --turf:#2FA36B;
  --flare:#E8FF57;
  --wine:#5C2145;
  --mist:#F2F7FA;
  --steel:#91A7B7;

  --line:rgba(145,167,183,.26);
  --line-strong:rgba(145,167,183,.5);
  --veil:rgba(242,247,250,.78);

  --font-display:"Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --shell:1240px;
  --gutter:4vw;
  --notch:14px;
  --cut:polygon(var(--notch) 0,100% 0,100% calc(100% - var(--notch)),calc(100% - var(--notch)) 100%,0 100%,0 var(--notch));
  --ease:cubic-bezier(.22,.61,.36,1);

  --step-display:clamp(44px,7vw,96px);
  --step-h2:clamp(30px,4vw,52px);
  --step-fee:clamp(44px,6vw,88px);
}

/* ============ 2. 重置 ============ */
*,*::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,address,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
address{font-style:normal}
table{border-collapse:collapse;width:100%}

/* ============ 3. 基础排版 ============ */
body{
  background:var(--ink);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:900;line-height:1.1;letter-spacing:-.02em}
h1{font-size:var(--step-display)}
h2{font-size:var(--step-h2)}
h3{font-size:clamp(20px,2.2vw,26px)}
strong,b{font-weight:800}
p{max-width:38em}
::selection{background:var(--flare);color:var(--ink)}
#main-content{scroll-margin-top:130px}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--flare);
  outline-offset:3px;
  border-radius:2px;
}

/* ============ 4. 容器与通用区块 ============ */
.shell{
  width:min(var(--shell),calc(100% - 2 * var(--gutter)));
  margin-inline:auto;
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(26px,4vw,48px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:12px 28px;margin-bottom:clamp(20px,3vw,36px);
}
.section-title{font-family:var(--font-display);font-size:var(--step-h2);font-weight:900;line-height:1.06;letter-spacing:-.02em}
.section-title em{font-style:normal;color:var(--amber)}
.lede{font-size:clamp(16.5px,1.8vw,20px);line-height:1.8;color:var(--veil);max-width:36em}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.03em}

/* ============ 5. 网格与分屏 ============ */
.split{display:grid;grid-template-columns:var(--split,3fr 9fr);gap:clamp(20px,3vw,40px);align-items:start}
.aside-rail{position:sticky;top:132px;display:grid;gap:12px}
.grid{display:grid;gap:clamp(14px,2vw,24px);grid-template-columns:repeat(var(--cols,12),minmax(0,1fr))}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}

/* ============ 6. 面板、标签、数字 ============ */
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,30px);
  background:linear-gradient(155deg,rgba(18,58,90,.92),rgba(11,39,64,.94));
  border:1px solid var(--line);
  clip-path:var(--cut);
}
.panel--wine{background:linear-gradient(155deg,rgba(92,33,69,.95),rgba(58,20,48,.96));border-color:rgba(217,85,63,.45)}
.panel--turf{background:linear-gradient(155deg,rgba(47,163,107,.9),rgba(11,39,64,.96));border-color:rgba(232,255,87,.34)}
.panel--flare{background:var(--flare);color:var(--ink);border-color:var(--flare)}
.panel--light{background:var(--mist);color:var(--ink);border-color:var(--mist)}

.plate{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--steel);
}
.plate::before{content:"";width:16px;height:2px;background:var(--amber)}
.plate--flare{color:var(--flare)}
.plate--flare::before{background:var(--flare)}

.tag{
  display:inline-block;padding:3px 9px;font-size:11.5px;font-weight:700;letter-spacing:.06em;
  border:1px solid currentColor;color:var(--steel);
}
.tag--turf{color:var(--turf)}
.tag--amber{color:var(--amber)}
.tag--flare{color:var(--flare)}
.tag--wine{color:#E9A9C6}

.stat{
  display:block;
  font-family:var(--font-mono);font-size:var(--step-fee);font-weight:700;
  line-height:1.03;letter-spacing:-.03em;color:var(--flare);
}
.stat__unit{font-size:.3em;letter-spacing:.02em;color:var(--steel);margin-left:.25em}
.stat--amber{color:var(--amber)}

/* ============ 7. 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;
  font-family:var(--font-body);font-size:14.5px;font-weight:800;letter-spacing:.03em;
  border:1px solid transparent;border-radius:2px;
  transition:transform .16s var(--ease),background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.btn--primary{background:linear-gradient(118deg,var(--amber),var(--coral));color:#071A2B}
.btn--primary:hover{transform:translateY(-1px);background:linear-gradient(118deg,var(--flare),var(--amber))}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--mist)}
.btn--ghost:hover{border-color:var(--flare);color:var(--flare)}

/* ============ 8. 面包屑 ============ */
.breadcrumbs{padding-block:14px;font-size:12.5px;letter-spacing:.06em;color:var(--steel)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:4px;max-width:none}
.breadcrumbs li{display:inline-flex;align-items:center}
.breadcrumbs li+li::before{content:"／";margin:0 6px;color:rgba(145,167,183,.5)}
.breadcrumbs a{color:var(--steel);border-bottom:1px solid transparent}
.breadcrumbs a:hover{color:var(--flare);border-bottom-color:rgba(232,255,87,.5)}
.breadcrumbs [aria-current="page"]{color:var(--mist);font-weight:700}

/* ============ 9. 图片容器 ============ */
.media{
  position:relative;overflow:hidden;
  aspect-ratio:16 / 9;
  background:linear-gradient(160deg,var(--tide),var(--navy) 70%,var(--ink));
  clip-path:var(--cut);
}
.media::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:repeating-linear-gradient(115deg,rgba(145,167,183,.14) 0 1px,transparent 1px 22px);
}
.media img,.media video{width:100%;height:100%;object-fit:cover}
.media__caption{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:6px 12px;background:rgba(7,26,43,.86);color:var(--steel);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}

/* ============ 10. 目录与折叠 ============ */
.toc{display:grid;gap:2px}
.toc__link{
  display:flex;align-items:baseline;gap:10px;
  padding:8px 10px;font-size:13.5px;color:var(--steel);
  border-left:2px solid transparent;
  transition:color .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease);
}
.toc__link:hover{color:var(--mist);background:rgba(18,58,90,.55)}
.toc__link.is-active{color:var(--flare);border-left-color:var(--flare);background:rgba(18,58,90,.7)}
.toc__num{font-family:var(--font-mono);font-size:11px;opacity:.72}

.fold{border:1px solid var(--line);border-left:3px solid var(--turf);background:rgba(11,39,64,.72)}
.fold+.fold{margin-top:10px}
.fold summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 16px;font-weight:800;font-size:15.5px;cursor:pointer;list-style:none;
}
.fold summary::-webkit-details-marker{display:none}
.fold summary::after{content:"+";font-family:var(--font-mono);font-size:18px;color:var(--amber);line-height:1}
.fold[open] summary::after{content:"–"}
.fold[open] summary{background:rgba(18,58,90,.55)}
.fold__body{padding:0 16px 16px;font-size:15.5px;line-height:1.8;color:var(--veil)}

/* ============ 11. 显现动效 ============ */
[data-reveal]{transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.has-js [data-reveal]{opacity:0;transform:translateY(14px)}
html.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ============ 12. 页头 ============ */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;background:var(--flare);color:var(--ink);
  font-weight:800;font-size:14px;border-radius:4px;
  transform:translateY(-200%);
  transition:transform .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink);
  border-bottom:1px solid var(--line);
  box-shadow:0 22px 44px -34px rgba(0,0,0,.95);
}

.header-rail{
  position:relative;
  background:linear-gradient(90deg,#071A2B 0%,#0B2740 46%,#123A5A 100%);
}
.header-rail::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(112deg,rgba(47,163,107,.16) 0 1px,transparent 1px 26px);
}
.header-rail__inner{
  position:relative;z-index:1;
  display:flex;align-items:center;gap:10px 20px;
  min-height:38px;padding-block:6px;
  font-size:12.5px;letter-spacing:.05em;color:var(--steel);
}
.brand-line{
  display:inline-flex;align-items:center;gap:9px;
  color:var(--mist);font-weight:800;letter-spacing:.08em;white-space:nowrap;max-width:none;
}
.brand-line__mark{
  width:8px;height:8px;flex:0 0 auto;
  background:var(--amber);transform:rotate(45deg);
  box-shadow:0 0 0 3px rgba(255,122,61,.18);
}
.brand-note{
  color:var(--steel);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:none;
}
.utility-nav{margin-left:auto;display:flex;flex-wrap:wrap;gap:6px}
.utility-nav a{
  display:inline-block;padding:3px 10px;
  border:1px solid var(--line);color:var(--mist);
  font-size:12px;letter-spacing:.02em;
  transition:color .16s var(--ease),border-color .16s var(--ease),background .16s var(--ease);
}
.utility-nav a:hover{color:var(--amber);border-color:rgba(255,122,61,.65);background:rgba(255,122,61,.1)}

.read-meter{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(145,167,183,.18);
}
.read-meter__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--turf),var(--flare) 55%,var(--amber));
  box-shadow:0 0 12px rgba(232,255,87,.4);
}

.header-deck{position:relative;background:var(--ink)}
.header-deck__inner{
  display:flex;align-items:center;gap:18px;
  min-height:70px;padding-block:10px;
}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__glyph{
  display:grid;place-items:center;width:40px;height:40px;
  background:linear-gradient(145deg,var(--amber),var(--coral));
  color:#071A2B;font-family:var(--font-display);font-weight:900;font-size:20px;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
}
.brand__text{display:flex;flex-direction:column;line-height:1.12}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:19px;letter-spacing:.02em;color:var(--mist)}
.brand__sub{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.24em;color:var(--steel);text-transform:uppercase}

.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 12px;
  border:1px solid var(--line-strong);
  background:rgba(18,58,90,.55);
  color:var(--mist);font-size:13px;font-weight:800;letter-spacing:.1em;
}
.nav-toggle:hover{border-color:var(--flare)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;background:var(--flare);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

.primary-nav{margin-left:auto;display:flex;align-items:center}
.primary-nav__list{display:flex;align-items:center;gap:2px}
.primary-nav__list a{
  position:relative;display:inline-block;
  padding:9px 12px;
  font-size:14.5px;font-weight:700;letter-spacing:.02em;
  color:rgba(242,247,250,.82);
  transition:color .16s var(--ease),background .16s var(--ease);
}
.primary-nav__list a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;
  background:var(--turf);transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.primary-nav__list a:hover{color:var(--mist);background:rgba(18,58,90,.7)}
.primary-nav__list a:hover::after{transform:scaleX(1)}
.primary-nav__list a[aria-current="page"]{
  color:#071A2B;background:var(--flare);font-weight:800;
}
.primary-nav__list a[aria-current="page"]::after{transform:scaleX(0)}
.primary-nav__cta{margin-left:10px}
.primary-nav__cta .btn{padding:11px 18px;font-size:14px}

/* ============ 13. 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:clamp(40px,6vw,80px);
  background:linear-gradient(180deg,#0B2740 0%,#071A2B 52%,#071A2B 100%);
  border-top:1px solid var(--line);
}
.footer-tide{
  height:6px;
  background:linear-gradient(90deg,var(--turf) 0 18%,var(--flare) 18% 27%,var(--amber) 27% 46%,var(--wine) 46% 100%);
}
.footer-grid{
  display:grid;grid-template-columns:1.15fr .95fr .9fr;
  gap:clamp(24px,4vw,52px);
  padding-block:clamp(34px,5vw,64px) clamp(22px,3vw,38px);
}
.footer-brand__mark{
  font-family:var(--font-display);font-size:clamp(26px,3vw,34px);font-weight:900;
  letter-spacing:-.01em;line-height:1.05;max-width:none;
}
.footer-brand__mark span{color:var(--amber)}
.footer-brand__statement{
  margin-top:14px;max-width:34ch;
  font-size:15px;line-height:1.8;color:rgba(242,247,250,.76);
}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;max-width:none}
.footer-tag{
  padding:4px 9px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--steel);border:1px solid var(--line);
}
.footer-tag--flare{color:var(--flare);border-color:rgba(232,255,87,.45)}

.footer-nav{display:grid;grid-template-columns:1fr 1fr;gap:clamp(18px,3vw,30px)}
.footer-group__title{
  margin-bottom:12px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;color:var(--steel);
}
.footer-group__list{display:grid;gap:9px;font-size:15px;max-width:none}
.footer-group__list a{
  color:rgba(242,247,250,.86);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-group__list a:hover{color:var(--flare);border-bottom-color:rgba(232,255,87,.6)}

.footer-contact{
  padding:clamp(16px,2vw,24px);
  background:linear-gradient(160deg,rgba(92,33,69,.94),rgba(58,20,48,.92));
  border:1px solid rgba(217,85,63,.4);
  clip-path:var(--cut);
}
.footer-contact__title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;
  letter-spacing:.16em;color:var(--flare);
}
.footer-contact__body{display:grid;gap:9px;font-size:14px}
.footer-contact__body p{
  display:grid;grid-template-columns:38px 1fr;gap:8px;align-items:baseline;max-width:none;
}
.footer-contact__key{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:rgba(242,247,250,.58)}
.footer-contact__val{color:var(--mist);word-break:break-word}
.footer-contact__note{margin-top:12px;font-size:12.5px;line-height:1.7;color:rgba(242,247,250,.62)}
.footer-contact__link{
  display:inline-block;margin-top:12px;
  font-size:13px;font-weight:800;color:var(--flare);
  border-bottom:1px solid rgba(232,255,87,.5);
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-contact__link:hover{color:var(--mist);border-bottom-color:var(--mist)}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  padding-block:18px 28px;
  border-top:1px solid var(--line);
  font-size:12.5px;color:var(--steel);
}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:6px 18px;max-width:none}
.footer-legal__links a{color:var(--steel);transition:color .16s var(--ease)}
.footer-legal__links a:hover{color:var(--flare)}
.footer-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 16px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;max-width:none;
}
.footer-year{color:var(--flare)}

/* ============ 14. 响应式 ============ */
@media (max-width:1180px){
  .brand-note{display:none}
}
@media (max-width:1000px){
  .utility-nav{display:none}
  .primary-nav__list a{padding:9px 9px;font-size:14px}
}
@media (max-width:920px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;z-index:70;
    display:block;margin:0;padding:0;
    max-height:0;overflow:hidden;visibility:hidden;
    background:linear-gradient(180deg,#0B2740,#071A2B);
    border-top:1px solid var(--line);border-bottom:1px solid var(--line);
    transition:max-height .3s var(--ease),visibility .3s var(--ease);
  }
  .primary-nav[data-open]{max-height:min(78vh,660px);overflow-y:auto;visibility:visible}
  .primary-nav__list{
    flex-direction:column;align-items:stretch;gap:2px;
    padding:10px var(--gutter) 20px;
  }
  .primary-nav__list a{
    display:block;padding:13px 12px;font-size:16px;
    border-bottom:1px solid rgba(145,167,183,.16);
  }
  .primary-nav__list a::after{display:none}
  .primary-nav__list a[aria-current="page"]{background:var(--flare);color:#071A2B}
  .primary-nav__cta{margin:14px 0 0}
  .primary-nav__cta .btn{width:100%;padding:14px}
  .aside-rail{position:static}
  .split{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-contact{grid-column:1 / -1}
}
@media (max-width:720px){
  body{font-size:16.5px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-contact{grid-column:auto}
  .footer-legal{justify-content:flex-start}
  #main-content{scroll-margin-top:110px}
}
@media (max-width:560px){
  .brand__sub{display:none}
  .header-deck__inner{min-height:60px;gap:12px}
  .header-rail__inner{min-height:32px;font-size:11.5px}
  .brand-line{font-size:11.5px;letter-spacing:.04em}
  .footer-nav{grid-template-columns:1fr}
  .grid--cards{grid-template-columns:1fr}
}

/* ============ 15. 动效偏好 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html.has-js [data-reveal]{opacity:1;transform:none}
  .read-meter__bar{transition:none}
}