/* ============ 01 · 设计令牌 ============ */
:root{
  --ink:#12100F;
  --ink-soft:#1C1917;
  --paper:#F4EDE0;
  --paper-2:#E7DCC8;
  --paper-3:#D9C9AE;
  --red:#D5233B;
  --red-deep:#7E1224;
  --blue:#1F4BFF;
  --orange:#FF7A18;
  --green:#12B76A;
  --line:#3A342F;
  --white:#FFFDF8;
  --on-ink:rgba(244,237,224,.74);
  --on-ink-dim:rgba(244,237,224,.46);
  --on-ink-line:rgba(244,237,224,.16);
  --hair:rgba(58,52,47,.18);
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-num:"SF Mono",ui-monospace,"Roboto Mono","DIN Alternate","Courier New",monospace;
  --pad-x:5vw;
  --maxw:1440px;
  --header-h:76px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --d:0.18s;
}

/* ============ 02 · 基础重置 ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
[hidden]{display:none !important}
h1,h2,h3,h4{font-weight:900;line-height:1.1;letter-spacing:-.02em}
h1{font-size:clamp(38px,5.4vw,76px)}
h2{font-size:clamp(26px,3.2vw,40px)}
h3{font-size:clamp(19px,1.8vw,25px)}
strong,b{font-weight:900}
#main-content{scroll-margin-top:96px}

:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
.site-header :focus-visible,
.site-footer :focus-visible,
.dark :focus-visible,
.nav-map :focus-visible{outline-color:var(--orange)}

.skip-link{
  position:fixed;left:16px;top:-80px;z-index:200;
  display:inline-block;padding:10px 18px;
  background:var(--red);color:var(--white);
  font-size:14px;font-weight:700;letter-spacing:.06em;
  transition:top var(--d) var(--ease);
}
.skip-link:focus{top:12px}

/* ============ 03 · 排版与容器 ============ */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad-x)}
.section{position:relative;padding-block:clamp(40px,6vw,88px)}
.prose{max-width:34em}
.prose p+p{margin-top:1em}
.prose a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.eyebrow{
  display:inline-block;font-family:var(--font-num);
  font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--red);
}
.index-num{
  display:block;font-family:var(--font-num);font-weight:200;
  font-size:1.6em;line-height:1;letter-spacing:.02em;color:var(--line);
}
.rule{height:1px;border:0;margin:0;background:var(--hair)}
.dark{background:var(--ink);color:var(--paper)}

/* ============ 04 · 网格 ============ */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.grid-12>*{grid-column:span 12}
@media (min-width:900px){
  .grid-12>.col-2{grid-column:span 2}
  .grid-12>.col-3{grid-column:span 3}
  .grid-12>.col-4{grid-column:span 4}
  .grid-12>.col-5{grid-column:span 5}
  .grid-12>.col-6{grid-column:span 6}
  .grid-12>.col-7{grid-column:span 7}
  .grid-12>.col-8{grid-column:span 8}
}

/* ============ 05 · 按钮 / 标签 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border:1px solid var(--line);
  font-size:14px;font-weight:700;letter-spacing:.06em;line-height:1.2;
  color:var(--ink);background:transparent;
  transition:background-color var(--d) var(--ease),color var(--d) var(--ease),border-color var(--d) var(--ease),transform var(--d) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--red);border-color:var(--red);color:var(--white)}
.btn-primary:hover{background:var(--red-deep);border-color:var(--red-deep)}
.btn-line{border-color:var(--line);color:var(--ink)}
.btn-line:hover{background:var(--ink);color:var(--paper)}
.btn-ghost{border-color:rgba(244,237,224,.42);color:var(--white)}
.btn-ghost:hover{background:var(--white);color:var(--ink);border-color:var(--white)}
.btn-sm{padding:9px 15px;font-size:12.5px;letter-spacing:.08em}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--line);
  background:var(--paper-2);color:var(--ink);
  font-family:var(--font-num);font-size:11.5px;letter-spacing:.12em;
  line-height:1.5;text-transform:uppercase;
}
.tag--red{background:var(--red);border-color:var(--red);color:var(--white)}
.tag--blue{background:var(--blue);border-color:var(--blue);color:var(--white)}
.tag--orange{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.tag--ghost{background:transparent;border-color:var(--on-ink-line);color:var(--on-ink)}

/* ============ 06 · 纸张卡与媒体容器 ============ */
.paper-card{
  position:relative;background:var(--paper);border:1px solid var(--line);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:6px 6px 0 0 var(--paper-2),6px 6px 0 1px rgba(58,52,47,.42);
}
.paper-card--fold::after{
  content:"";position:absolute;right:-1px;bottom:-1px;width:20px;height:20px;
  background:linear-gradient(225deg,var(--paper) 0 50%,var(--paper-3) 50% 100%);
  border-left:1px solid var(--line);border-top:1px solid var(--line);
}
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/9;background:var(--paper-2);border:1px solid var(--line);
}
.media-frame>img,
.media-frame>picture,
.media-frame>svg{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--slope{clip-path:polygon(0 0,100% 0,100% 88%,0 100%)}
.media-frame__badge{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:5px 12px;background:var(--red);color:var(--white);
  font-family:var(--font-num);font-size:11px;letter-spacing:.12em;
}

/* ============ 07 · 面包屑 ============ */
.breadcrumb{font-size:12.5px;letter-spacing:.06em;line-height:1.6}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.breadcrumb-item{display:flex;align-items:center;gap:10px;color:var(--line);opacity:.8}
.breadcrumb-item+.breadcrumb-item::before{content:"/";font-family:var(--font-num);opacity:.5}
.breadcrumb-link{text-decoration:none}
.breadcrumb-link:hover{color:var(--red)}
.breadcrumb-current{color:var(--ink);font-weight:700;opacity:1}

/* ============ 08 · 页头 ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  color:var(--white);
  background-image:linear-gradient(180deg,rgba(18,16,15,.80) 0%,rgba(18,16,15,.36) 58%,rgba(18,16,15,0) 100%);
  transition:background-color var(--d) var(--ease),box-shadow var(--d) var(--ease);
}
.site-header[data-scrolled="true"]{
  background-color:var(--ink);background-image:none;
  box-shadow:0 1px 0 var(--line),0 18px 40px rgba(18,16,15,.30);
}
.header-inner{
  position:relative;display:flex;align-items:center;gap:24px;
  height:var(--header-h);max-width:var(--maxw);
  margin-inline:auto;padding-inline:var(--pad-x);
  transition:height var(--d) var(--ease);
}
.site-header[data-scrolled="true"] .header-inner{height:60px}

.brand{display:flex;align-items:center;gap:12px;flex:none;min-width:0;color:inherit}
.brand-mark{
  flex:none;width:38px;height:38px;display:grid;place-items:center;
  background:var(--red);color:var(--white);
  font-size:18px;font-weight:900;letter-spacing:.02em;line-height:1;
  clip-path:polygon(0 0,100% 0,100% 64%,64% 100%,0 100%);
  transition:background-color var(--d) var(--ease);
}
.brand:hover .brand-mark{background:var(--red-deep)}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-name{font-size:17px;font-weight:900;letter-spacing:.04em;white-space:nowrap}
.brand-sub{
  font-family:var(--font-num);font-size:9.5px;letter-spacing:.2em;
  color:var(--on-ink-dim);white-space:nowrap;
}
.brand-live{
  display:inline-flex;align-items:center;gap:6px;margin-left:6px;
  padding:3px 9px;border:1px solid var(--on-ink-line);
  font-size:11px;letter-spacing:.1em;color:var(--on-ink);white-space:nowrap;
}
.dot-breath,.dot-live{
  display:inline-block;flex:none;width:7px;height:7px;border-radius:50%;
  background:var(--green);animation:breathe 1.6s ease-in-out infinite;
}
.dot-live{background:var(--orange)}
@keyframes breathe{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.42;transform:scale(.78)}
}

.nav-index{display:flex;align-items:center;margin-inline:auto;min-width:0}
.nav-list{display:flex;align-items:center;gap:clamp(10px,1.6vw,26px)}
.nav-item{display:flex;align-items:center}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:5px;
  padding:9px 2px;font-size:13px;letter-spacing:.08em;
  color:var(--on-ink);white-space:nowrap;
  transition:color var(--d) var(--ease);
}
.nav-link:hover,.nav-link[aria-current="page"]{color:var(--white)}
.nav-num{
  font-family:var(--font-num);font-size:9.5px;letter-spacing:.12em;
  color:var(--on-ink-dim);transition:color var(--d) var(--ease);
}
.nav-link:hover .nav-num,
.nav-link[aria-current="page"] .nav-num{color:var(--orange)}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--red);transform:scaleX(0);transform-origin:0 50%;
  transition:transform var(--d) var(--ease);
}
.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.header-side{display:flex;align-items:center;gap:16px;flex:none;margin-left:auto}
.header-section{
  font-family:var(--font-num);font-size:11px;letter-spacing:.14em;
  color:var(--orange);min-width:2ch;opacity:0;
  transition:opacity var(--d) var(--ease);
}
.site-header[data-scrolled="true"] .header-section{opacity:1}
.header-status{
  display:inline-flex;align-items:center;gap:6px;
  font-size:11.5px;letter-spacing:.06em;color:var(--on-ink-dim);white-space:nowrap;
}
.header-cta{flex:none}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid var(--on-ink-line);
  color:var(--white);font-size:12px;letter-spacing:.14em;
  transition:background-color var(--d) var(--ease),border-color var(--d) var(--ease);
}
.nav-toggle:hover{background:rgba(244,237,224,.12)}
.nav-toggle-box{display:grid;gap:3px;width:16px}
.nav-toggle-bar{
  display:block;height:2px;width:100%;background:currentColor;
  transition:transform var(--d) var(--ease),opacity var(--d) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.header-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(244,237,224,.12)}
.header-progress-bar{
  display:block;height:100%;width:0;background:var(--red);
  transition:width .1s linear;
}

/* ---- 移动索引地图 ---- */
.nav-map{
  position:fixed;inset:0;z-index:85;
  background:var(--ink);color:var(--white);
  padding:calc(var(--header-h) + 20px) var(--pad-x) 96px;
  overflow-y:auto;overscroll-behavior:contain;
}
.nav-map-inner{max-width:720px;margin-inline:auto}
.nav-map-eyebrow{
  font-family:var(--font-num);font-size:11px;letter-spacing:.22em;
  color:var(--orange);text-transform:uppercase;
  padding-bottom:14px;border-bottom:1px solid var(--on-ink-line);
}
.nav-map-list{margin-top:8px}
.nav-map-item{border-bottom:1px solid var(--on-ink-line)}
.nav-map-link{
  display:flex;align-items:baseline;gap:14px;padding:15px 0;
  font-size:clamp(20px,5.6vw,26px);font-weight:900;letter-spacing:-.01em;
  color:var(--white);
  transition:color var(--d) var(--ease),padding-left var(--d) var(--ease);
}
.nav-map-link:hover,
.nav-map-link:focus-visible{color:var(--orange);padding-left:8px}
.nav-map-num{
  font-family:var(--font-num);font-size:11px;font-weight:400;letter-spacing:.18em;
  color:var(--red);min-width:26px;
}
.nav-map-name{flex:1;min-width:0}
.nav-map-note{
  margin-top:24px;font-size:12px;letter-spacing:.06em;color:var(--on-ink-dim);
  word-break:break-word;
}
body.nav-open{overflow:hidden}

/* ============ 09 · 页脚 ============ */
.site-footer{
  position:relative;background:var(--ink);color:var(--on-ink);font-size:14px;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--red) 0 34%,var(--orange) 34% 47%,var(--blue) 47% 63%,var(--line) 63% 100%);
}
.footer-inner{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad-x)}
.footer-head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:16px 40px;flex-wrap:wrap;
  padding:clamp(40px,5vw,64px) 0 26px;
  border-bottom:1px solid var(--on-ink-line);
}
.footer-logo{font-size:clamp(28px,4.4vw,46px);font-weight:900;letter-spacing:-.02em;line-height:1;color:var(--white)}
.footer-tagline{font-size:13px;letter-spacing:.06em;color:var(--on-ink-dim);max-width:32em}
.footer-cols{
  display:grid;grid-template-columns:1.05fr 1.25fr 1fr;
  gap:32px 48px;padding:36px 0 32px;
}
.footer-col{min-width:0}
.footer-col-title{
  font-family:var(--font-num);font-size:11px;font-weight:400;
  letter-spacing:.2em;text-transform:uppercase;
  color:var(--orange);margin-bottom:14px;line-height:1.4;
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-item{display:block}
.footer-link{
  display:inline-block;padding:4px 0;font-size:14px;color:var(--on-ink);
  border-bottom:1px solid transparent;
  transition:color var(--d) var(--ease),border-color var(--d) var(--ease);
}
.footer-link:hover{color:var(--white);border-bottom-color:var(--red)}
.footer-contact{display:flex;flex-direction:column;gap:12px}
.footer-contact-item{display:flex;flex-direction:column;gap:2px}
.footer-contact-label{
  font-family:var(--font-num);font-size:10.5px;letter-spacing:.16em;
  color:var(--on-ink-dim);text-transform:uppercase;
}
.footer-contact-value{font-size:14px;line-height:1.6;color:var(--paper);word-break:break-word}
.footer-note{
  margin-top:16px;padding-left:12px;border-left:2px solid var(--red);
  font-size:12px;line-height:1.7;color:var(--on-ink-dim);
}
.footer-meta{margin-top:10px;font-size:12.5px;line-height:1.7;color:var(--on-ink);word-break:break-word}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:flex-end;
  gap:12px 32px;flex-wrap:wrap;
  padding:18px 0 30px;border-top:1px solid var(--on-ink-line);
  font-size:12px;letter-spacing:.04em;color:var(--on-ink-dim);
}
.footer-copy{max-width:36em;line-height:1.7}
.footer-copy:first-child{color:var(--paper)}

/* ============ 10 · 筛选 / 索引 / 显现 ============ */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  padding:7px 14px;border:1px solid var(--line);background:transparent;
  font-size:12.5px;letter-spacing:.1em;color:var(--ink);
  transition:background-color var(--d) var(--ease),color var(--d) var(--ease),border-color var(--d) var(--ease);
}
.filter-btn:hover{border-color:var(--blue);color:var(--blue)}
.filter-btn[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:var(--white)}
.dark .filter-btn{border-color:var(--on-ink-line);color:var(--on-ink)}
.dark .filter-btn[aria-pressed="true"]{color:var(--white)}
[data-filter-item].is-filtered{display:none}
[data-sec-link]{
  display:flex;align-items:center;gap:10px;
  transition:color var(--d) var(--ease);
}
[data-sec-link].is-active{color:var(--red);font-weight:700}

.js [data-reveal]{opacity:0;transform:translateY(24px)}
[data-reveal]{
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ============ 11 · 响应式 ============ */
@media (max-width:1180px){
  .header-status{display:none}
  .nav-list{gap:12px}
  .nav-link{font-size:12.5px}
}
@media (max-width:899px){
  :root{--header-h:64px}
  .site-header[data-scrolled="true"] .header-inner{height:56px}
  .nav-index{display:none}
  .header-inner{justify-content:space-between;gap:12px}
  .header-side{margin-left:auto;gap:0}
  .header-cta{display:none}
  .brand-live{display:none}
  .nav-toggle{
    display:inline-flex;position:fixed;right:16px;bottom:18px;z-index:95;
    padding:12px 16px;background:var(--red);border-color:var(--red);color:var(--white);
    box-shadow:0 12px 26px rgba(18,16,15,.35);
  }
  .nav-toggle:hover{background:var(--red-deep);border-color:var(--red-deep)}
  .nav-toggle-label{font-size:11px}
  .footer-cols{grid-template-columns:1fr 1fr}
  .site-footer::before{height:3px}
}
@media (max-width:640px){
  .brand-sub{display:none}
  .footer-head{padding-top:36px}
  .footer-cols{grid-template-columns:1fr;gap:26px;padding:28px 0}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .grid-12{gap:16px}
}

/* ============ 12 · 动效降级 ============ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .dot-breath,.dot-live{animation:none;opacity:1;transform:none}
  .js [data-reveal],
  [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
}