:root{
  --orange:#FF8A1F;
  --orange-soft:#FFB24D;
  --ink:#0E1B33;
  --cyan:#00C2C7;
  --rose:#E23E72;
  --cream:#FFF7EA;
  --stone:#6F7480;
  --moss:#5C7A5A;
  --clay:#B8673D;
  --night:#152A4A;
  --glass:rgba(255,255,255,.72);
  --shell-w:1200px;
  --radius:22px;
  --gap:18px;
  --shadow-panel:0 0 0 1px rgba(14,27,51,.07),0 14px 0 -8px rgba(255,138,31,.16),0 26px 44px -32px rgba(14,27,51,.55);
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body{
  margin:0;
  font-family:var(--font);
  font-size:17px;
  line-height:1.7;
  font-weight:400;
  color:var(--ink);
  background:
    radial-gradient(1100px 520px at 88% -8%,rgba(255,138,31,.16),transparent 62%),
    radial-gradient(900px 480px at -10% 12%,rgba(0,194,199,.12),transparent 60%),
    var(--cream);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:8px}
#main-content{display:block}
.shell{width:100%;max-width:var(--shell-w);margin-inline:auto;padding-inline:20px}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:60}
.skip-link{
  position:absolute;left:14px;top:-72px;z-index:120;
  background:var(--ink);color:var(--cream);text-decoration:none;
  font-weight:800;font-size:15px;padding:12px 18px;border-radius:12px;
  transition:top .2s ease;
}
.skip-link:focus{top:12px}
.site-header__rail{
  background:linear-gradient(100deg,#FF8A1F 0%,#FFB24D 52%,#E23E72 100%);
  color:var(--ink);
  border-bottom:1px solid rgba(14,27,51,.12);
}
.rail__inner{
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
  min-height:44px;padding-block:7px;
}
.rail__motto{
  font-size:13px;font-weight:900;letter-spacing:.06em;
  display:inline-flex;align-items:center;gap:8px;
}
.rail__motto::before{
  content:"";width:8px;height:8px;border-radius:50%;
  background:var(--ink);box-shadow:0 0 0 3px rgba(255,255,255,.55);
}
.rail__badge{
  background:var(--glass);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  border:1px solid rgba(255,255,255,.9);
  border-radius:999px;padding:3px 11px;
  font-size:12px;font-weight:800;letter-spacing:.04em;color:var(--ink);
}
.rail__mail{
  margin-left:auto;font-size:13px;font-weight:800;text-decoration:none;
  color:var(--ink);border-bottom:2px solid rgba(14,27,51,.4);
  padding-bottom:1px;min-height:32px;display:inline-flex;align-items:center;
}
.rail__mail:hover,.rail__mail:focus-visible{border-bottom-color:var(--cyan)}
.site-header__bar{background:var(--ink);color:var(--cream)}
.bar__inner{
  display:flex;align-items:center;gap:16px;
  min-height:66px;padding-block:8px;
}
.brand{
  display:inline-flex;align-items:center;gap:10px;
  text-decoration:none;color:var(--cream);flex:0 0 auto;
}
.brand__mark{
  display:grid;place-items:center;width:40px;height:40px;border-radius:13px;
  background:linear-gradient(140deg,var(--orange),var(--rose));
  color:#fff;font-size:19px;font-weight:900;line-height:1;
  box-shadow:0 10px 20px -12px rgba(255,138,31,.95);
}
.brand__text{display:flex;flex-direction:column;line-height:1.08}
.brand__name{font-size:19px;font-weight:900;letter-spacing:.02em}
.brand__sub{font-size:10px;font-weight:800;letter-spacing:.24em;color:var(--cyan)}
.site-nav{margin-left:auto;display:flex}
.site-nav__list{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.site-nav__item{list-style:none}
.site-nav__link{
  display:inline-flex;align-items:center;min-height:44px;
  padding:8px 13px;border-radius:12px;
  font-size:15px;font-weight:600;text-decoration:none;
  color:rgba(255,247,234,.86);
  border:1px solid transparent;
  transition:color .18s ease,background-color .18s ease,border-color .18s ease;
}
.site-nav__link:hover{color:#fff;border-color:rgba(0,194,199,.75)}
.site-nav__link[aria-current="page"]{
  background:var(--orange);color:var(--ink);font-weight:900;
  border-color:var(--orange);
}
.nav-toggle{
  display:none;
  align-items:center;justify-content:center;gap:10px;
  border:0;cursor:pointer;
}
.nav-toggle__bars{
  width:20px;height:14px;
  background-image:linear-gradient(var(--ink),var(--ink)),linear-gradient(var(--ink),var(--ink)),linear-gradient(var(--ink),var(--ink));
  background-size:100% 2px;background-position:0 0,0 6px,0 12px;background-repeat:no-repeat;
}
.site-header__progress{height:3px;background:rgba(255,255,255,.14);overflow:hidden}
.site-header__progress-fill{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--orange),var(--rose),var(--cyan));
  transition:transform .12s linear;
}
.to-top{
  position:fixed;right:18px;bottom:24px;z-index:65;
  width:48px;height:48px;border-radius:50%;
  display:grid;place-items:center;
  border:1px solid rgba(14,27,51,.14);
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  color:var(--ink);font-size:18px;font-weight:900;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}

/* ---------- footer ---------- */
.site-footer{
  margin-top:72px;
  background:linear-gradient(165deg,var(--night) 0%,#0E1B33 58%,#0b1425 100%);
  color:rgba(255,247,234,.86);
  border-top:4px solid var(--orange);
}
.footer__grid{
  display:grid;gap:28px;
  grid-template-columns:1fr;
  padding-block:44px 36px;
}
.footer__panel{min-width:0}
.footer__motto{
  font-size:22px;font-weight:900;color:var(--cream);
  line-height:1.3;margin-bottom:10px;
}
.footer__title{
  font-size:12px;font-weight:900;letter-spacing:.2em;text-transform:uppercase;
  color:var(--cyan);margin-bottom:14px;
}
.footer__list{display:grid;gap:6px}
.footer__link{
  display:inline-flex;align-items:center;min-height:34px;
  font-size:15px;font-weight:600;text-decoration:none;
  color:rgba(255,247,234,.86);
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color .18s ease,border-color .18s ease;
}
.footer__link:hover,.footer__link:focus-visible{color:#fff;border-bottom-color:var(--orange)}
.footer__line{
  font-size:14px;line-height:1.75;margin-bottom:7px;
  color:rgba(255,247,234,.78);word-break:break-word;
}
.footer__panel--brand .tag{margin-top:6px}
.footer__base{
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  border-top:1px solid rgba(255,255,255,.14);
  padding-block:18px 30px;
  font-size:13px;color:rgba(255,247,234,.6);
}
.footer__copy,.footer__icp{margin:0}

/* ---------- 通用版式 ---------- */
.section{padding-block:clamp(38px,6.5vw,80px)}
.section__head{display:grid;gap:10px;margin-bottom:26px;max-width:70ch}
.section__title{
  font-size:clamp(26px,4.4vw,40px);line-height:1.16;font-weight:900;
  letter-spacing:-.012em;
}
.section__lede{font-size:16px;line-height:1.75;color:#3c4356}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px;font-weight:900;letter-spacing:.2em;text-transform:uppercase;
  color:var(--clay);
}
.side-note{
  display:inline-block;font-size:13px;font-weight:800;letter-spacing:.24em;
  color:var(--stone);
  border-left:2px solid var(--cyan);padding-left:10px;
}
.stack{display:grid;gap:20px}
.stack--tight{display:grid;gap:10px}
.grid{display:grid;gap:var(--gap);grid-template-columns:1fr}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.split{display:grid;gap:26px;grid-template-columns:1fr}
.rule{
  height:3px;border:0;border-radius:3px;margin:0;
  background:linear-gradient(90deg,var(--orange),var(--rose),var(--cyan));
  opacity:.9;
}

/* ---------- 研究板面板 ---------- */
.panel{
  position:relative;background:#fff;border-radius:var(--radius);
  padding:clamp(20px,3.4vw,32px);
  box-shadow:var(--shadow-panel);
  border:1px solid rgba(14,27,51,.07);
  min-width:0;
}
.panel--glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px) saturate(1.15);
  backdrop-filter:blur(12px) saturate(1.15);
  border:1px solid rgba(255,255,255,.85);
  box-shadow:0 0 0 1px rgba(14,27,51,.06),0 26px 48px -34px rgba(14,27,51,.6);
}
.panel--night{
  background:linear-gradient(160deg,var(--night),#0b1425);
  color:var(--cream);border-color:rgba(255,255,255,.12);
  box-shadow:0 0 0 1px rgba(0,194,199,.24),0 26px 48px -32px rgba(0,0,0,.75);
}
.panel--orange{
  background:linear-gradient(140deg,var(--orange),var(--orange-soft));
  color:var(--ink);border-color:rgba(255,255,255,.5);
  box-shadow:0 0 0 1px rgba(226,62,114,.22),0 24px 44px -30px rgba(255,138,31,.95);
}
.panel__head{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.panel__index{
  font-size:13px;font-weight:900;letter-spacing:.16em;color:var(--orange);
}
.panel--orange .panel__index{color:#7a3500}
.panel__title{font-size:clamp(19px,2.4vw,23px);font-weight:900;line-height:1.3}
.panel__body{font-size:15.5px;line-height:1.78;color:#3c4356}
.panel--night .panel__body{color:rgba(255,247,234,.82)}
.panel--orange .panel__body{color:#48240a}

/* ---------- 按钮与标记 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 22px;border-radius:999px;
  font-size:16px;font-weight:900;text-decoration:none;
  border:2px solid transparent;cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,border-color .18s ease;
}
.btn--primary{
  background:linear-gradient(100deg,var(--orange),#FFB24D 58%,var(--rose));
  color:var(--ink);
  box-shadow:0 16px 28px -18px rgba(255,138,31,.95);
}
.btn--primary:hover{transform:translateY(-2px)}
.btn--ghost{background:transparent;border-color:rgba(14,27,51,.24);color:var(--ink)}
.btn--ghost:hover{border-color:var(--cyan);background:rgba(0,194,199,.1)}
.btn--quiet{background:rgba(14,27,51,.07);color:var(--ink)}
.btn--quiet:hover{background:rgba(14,27,51,.13)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;border-radius:999px;
  font-size:12px;font-weight:900;letter-spacing:.04em;
  background:rgba(14,27,51,.08);color:var(--ink);
}
.tag--cyan{background:rgba(0,194,199,.18);color:#046b6e}
.tag--rose{background:rgba(226,62,114,.15);color:#a8214b}
.tag--moss{background:rgba(92,122,90,.17);color:#3d573c}
.tag--clay{background:rgba(184,103,61,.17);color:#8a4826}
.tag--orange{background:rgba(255,138,31,.2);color:#92470a}
.link-arrow{
  display:inline-flex;align-items:center;gap:7px;min-height:44px;
  font-size:15px;font-weight:900;text-decoration:none;color:var(--ink);
  border-bottom:2px solid var(--cyan);padding-bottom:2px;
}
.link-arrow::after{content:"→";transition:transform .18s ease}
.link-arrow:hover::after{transform:translateX(4px)}

/* ---------- 面包屑与正文 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:13px;color:var(--stone);padding-block:16px;
}
.crumbs__link{
  color:var(--stone);text-decoration:none;
  border-bottom:1px solid rgba(111,116,128,.45);padding-bottom:1px;
}
.crumbs__link:hover,.crumbs__link:focus-visible{color:var(--ink);border-bottom-color:var(--cyan)}
.crumbs__sep{color:rgba(111,116,128,.6)}
.crumbs__current{font-weight:800;color:var(--ink)}
.prose{max-width:70ch;font-size:16.5px;line-height:1.8}
.prose p{margin-bottom:1.05em}
.prose h2,.prose h3{margin:1.6em 0 .55em;line-height:1.28;font-weight:900}
.prose ul,.prose ol{margin-bottom:1.1em;padding-left:1.3em;line-height:1.8}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.35em}
.prose a{color:#0b6f74;text-decoration:underline;text-decoration-color:var(--cyan);text-underline-offset:3px}

/* ---------- 数字符号与图片容器 ---------- */
.step-number{
  font-size:clamp(64px,14vw,132px);
  font-weight:900;line-height:.82;letter-spacing:-.04em;
  color:var(--orange);font-feature-settings:"tnum";
}
.media-frame{
  position:relative;display:block;overflow:hidden;
  width:100%;aspect-ratio:16/10;
  border-radius:var(--radius);
  background:linear-gradient(135deg,#FFE6C7 0%,#FFF7EA 48%,#D9F5F4 100%);
  border:1px solid rgba(14,27,51,.08);
  box-shadow:0 20px 38px -30px rgba(14,27,51,.6);
}
.media-frame--square{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__img,.media-frame>img{
  width:100%;height:100%;object-fit:cover;display:block;
}

/* ---------- 显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s ease,transform .6s ease;
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 平板 ---------- */
@media (min-width:640px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .side-note{font-size:13px}
}
@media (min-width:900px){
  .split{grid-template-columns:minmax(0,1.05fr) minmax(0,1.35fr);align-items:start}
  .footer__grid{grid-template-columns:1.3fr .85fr 1.1fr .9fr;gap:32px}
  .side-note{
    writing-mode:vertical-rl;text-orientation:mixed;
    border-left:0;border-top:2px solid var(--cyan);
    padding:12px 0 0;letter-spacing:.3em;
  }
  .step-number{font-size:clamp(112px,11vw,170px)}
}

/* ---------- 移动导航 ---------- */
@media (max-width:900px){
  body{padding-bottom:88px}
  .bar__inner{min-height:60px}
  .site-nav{
    position:fixed;left:12px;right:12px;bottom:96px;z-index:70;
    display:block;margin:0;padding:14px;
    max-height:62vh;overflow:auto;
    border-radius:22px;
    background:linear-gradient(160deg,var(--night),#0b1425);
    border:1px solid rgba(255,255,255,.14);
    box-shadow:0 34px 64px -32px rgba(0,0,0,.8);
    opacity:0;visibility:hidden;transform:translateY(18px);
    transition:opacity .24s ease,transform .24s ease,visibility .24s ease;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:none}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:6px}
  .site-nav__link{
    min-height:50px;font-size:17px;padding:12px 16px;border-radius:14px;
    background:rgba(255,255,255,.06);
  }
  .site-nav__link[aria-current="page"]{background:var(--orange);color:var(--ink)}
  .nav-toggle{
    display:inline-flex;
    position:fixed;left:12px;right:12px;bottom:16px;z-index:80;
    min-height:58px;border-radius:16px;
    background:linear-gradient(100deg,var(--orange),#FFB24D 58%,var(--rose));
    color:var(--ink);font-size:17px;font-weight:900;
    box-shadow:0 18px 36px -20px rgba(226,62,114,.95);
  }
  .to-top{bottom:96px;right:14px;width:44px;height:44px}
  .site-header__progress{height:4px}
}
@media (max-width:420px){
  .rail__motto{font-size:12px}
  .rail__mail{margin-left:0}
  .brand__name{font-size:17px}
  .brand__sub{letter-spacing:.18em}
}

/* ---------- 动效兼容 ---------- */
@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;
  }
  [data-reveal]{opacity:1;transform:none}
  .site-header__progress-fill{transition:none}
}