/* ============ 01. 设计令牌 ============ */
:root{
  --ink:#070B14;
  --indigo:#0E1730;
  --slate:#1B2540;
  --cyan:#2BE3E0;
  --orange:#FF7A2F;
  --lime:#C6F24E;
  --paper:#F2E9DA;
  --chalk:#E8EDF5;
  --steel:#8A98B5;
  --muted:#9EACC6;
  --lane:#3A4A6B;

  --font-display:"Songti SC","Noto Serif CJK SC","Source Han Serif SC",Georgia,"Times New Roman",serif;
  --font-narrow:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --maxw:1320px;
  --gutter:clamp(16px,4vw,48px);
  --radius:2px;
}

/* ============ 02. Reset ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:150px}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button,input{font:inherit;color:inherit}
table{border-collapse:collapse}

/* ============ 03. 基础排版 ============ */
body{
  background:var(--ink);
  color:var(--chalk);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
@media (max-width:640px){body{font-size:16px}}

a{color:var(--cyan);text-decoration-color:rgba(43,227,224,.45);text-underline-offset:3px}
a:hover{color:var(--orange);text-decoration-color:currentColor}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

[id]{scroll-margin-top:150px}

.skip-link{
  position:absolute;left:14px;top:-70px;z-index:99;
  background:var(--paper);color:var(--ink);
  padding:10px 18px;font-size:13px;letter-spacing:.12em;
  border-radius:var(--radius);text-decoration:none;
  transition:top .12s ease;
}
.skip-link:focus{top:12px;color:var(--ink)}

/* ============ 04. 顶部刊头 ============ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,11,20,.92);
  -webkit-backdrop-filter:blur(12px) saturate(1.2);
  backdrop-filter:blur(12px) saturate(1.2);
  border-bottom:1px solid var(--lane);
  transition:border-color .12s ease,box-shadow .12s ease;
}
.site-header.is-stuck{
  border-bottom-color:rgba(43,227,224,.42);
  box-shadow:0 16px 40px rgba(0,0,0,.55);
}
.scroll-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--lime) 55%,var(--orange));
  will-change:transform;
}
.site-header__inner{
  width:min(100% - var(--gutter)*2,var(--maxw));
  margin-inline:auto;
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(12px,2.4vw,36px);
  padding-block:14px 10px;
}

/* 左侧竖排品牌轨道 */
.brand-rail{
  display:flex;flex-direction:column;align-items:center;gap:12px;
  padding-block:6px;
}
.brand-rail__text{
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:11.5px;letter-spacing:.44em;
  color:var(--steel);white-space:nowrap;
}
.brand-rail__line{
  width:1px;height:46px;
  background:linear-gradient(var(--cyan),rgba(43,227,224,0));
}

/* 中央报头 */
.masthead{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center}
.masthead__issue{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  color:var(--steel);
}
.masthead__issue b{color:var(--lime);font-weight:600}
.masthead__brand{
  display:inline-flex;align-items:baseline;gap:10px;
  text-decoration:none;color:var(--chalk);
}
.masthead__mark{
  font-family:var(--font-display);font-weight:500;
  font-size:clamp(20px,2.4vw,28px);letter-spacing:.1em;color:var(--paper);
}
.masthead__word{
  font-family:var(--font-narrow);font-weight:800;
  font-size:clamp(18px,2.2vw,26px);letter-spacing:.14em;color:var(--cyan);
}
.masthead__brand:hover .masthead__word{color:var(--orange)}
.masthead__brand:hover .masthead__mark{color:var(--chalk)}

/* 栏目表 */
.mainnav{margin-top:6px;width:100%}
.mainnav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:2px}
.mainnav__link{
  display:flex;align-items:baseline;gap:7px;
  padding:7px 12px;font-size:13.5px;letter-spacing:.06em;
  color:var(--chalk);text-decoration:none;
  border:1px solid transparent;border-radius:var(--radius);
  transition:background .12s ease,border-color .12s ease,color .12s ease;
}
.mainnav__num{font-family:var(--font-mono);font-size:10px;color:var(--steel);transition:color .12s ease}
.mainnav__link:hover{background:rgba(43,227,224,.1);border-color:var(--lane);color:var(--paper)}
.mainnav__link:hover .mainnav__num{color:var(--orange)}
.mainnav__link[aria-current="page"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.mainnav__link[aria-current="page"] .mainnav__num{color:rgba(7,11,20,.7)}

/* 工具区 */
.header-tools{display:flex;align-items:center;gap:12px}
.util-link{
  font-size:12.5px;letter-spacing:.1em;color:var(--steel);
  text-decoration:none;padding:5px 2px;
  border-bottom:1px solid transparent;
  transition:color .12s ease,border-color .12s ease;
}
.util-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  background:transparent;border:1px solid var(--lane);border-radius:var(--radius);
  color:var(--chalk);font-size:12px;letter-spacing:.16em;
  padding:9px 12px;cursor:pointer;
  transition:border-color .12s ease,color .12s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:block;position:relative;width:16px;height:9px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1px;background:var(--cyan);
  transition:transform .12s ease,top .12s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* ============ 05. 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  background:linear-gradient(180deg,var(--ink),var(--indigo));
  border-top:1px solid var(--lane);
  color:var(--chalk);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--cyan) 0 20%,var(--lime) 20% 32%,var(--orange) 32% 42%,transparent 42%);
}
.site-footer__inner{
  width:min(100% - var(--gutter)*2,var(--maxw));
  margin-inline:auto;
  padding:clamp(36px,6vw,76px) 0 30px;
  display:grid;
  grid-template-columns:minmax(0,1.1fr) minmax(0,1.5fr);
  gap:clamp(28px,5vw,80px);
}
.site-footer__brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.site-footer__logo{
  font-family:var(--font-narrow);font-weight:800;
  font-size:clamp(22px,3vw,34px);letter-spacing:.1em;
  color:var(--paper);text-decoration:none;
}
.site-footer__logo:hover{color:var(--orange)}
.site-footer__tag{margin:0;color:var(--steel);font-size:15px;max-width:32ch}

.site-footer__cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(20px,3vw,44px)}
.footer-col__title{
  font-family:var(--font-display);font-weight:500;
  font-size:13.5px;letter-spacing:.3em;color:var(--cyan);
  margin-bottom:16px;
}
.footer-col ul{display:grid;gap:11px}
.footer-col a{
  color:var(--chalk);font-size:15px;text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .12s ease,border-color .12s ease;
}
.footer-col a:hover{color:var(--orange);border-bottom-color:var(--orange)}

.site-footer__meta{
  grid-column:1 / -1;
  border-top:1px solid var(--lane);
  padding-top:22px;
  display:grid;gap:10px;
  font-size:13px;color:var(--steel);
}
.service-line{margin:0;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.02em;color:var(--steel)}
.footer-note{margin:0;max-width:74ch;color:var(--muted)}
.legal-line{margin:0;font-size:12.5px;letter-spacing:.04em;color:var(--steel);word-break:break-word}
.legal-line .mono{color:var(--cyan)}

.to-top{
  justify-self:start;
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--steel);background:transparent;
  border:1px solid var(--lane);border-radius:var(--radius);
  padding:8px 13px;cursor:pointer;
  opacity:0;visibility:hidden;
  transition:opacity .12s ease,color .12s ease,border-color .12s ease;
}
.to-top.is-shown{opacity:1;visibility:visible}
.to-top:hover{color:var(--orange);border-color:var(--orange)}

/* ============ 06. 通用容器与栅格 ============ */
.wrap{width:min(100% - var(--gutter)*2,var(--maxw));margin-inline:auto}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--rail{grid-template-columns:minmax(0,1fr) minmax(0,2.1fr);align-items:start}

@media (max-width:900px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .grid--rail{grid-template-columns:minmax(0,1fr)}
}

.rule{height:1px;border:0;background:var(--lane);margin-block:clamp(28px,5vw,64px)}

.runway{position:relative}
.runway::before,
.runway::after{
  content:"";position:absolute;top:0;bottom:0;width:1px;
  background:repeating-linear-gradient(180deg,var(--lane) 0 14px,transparent 14px 30px);
  pointer-events:none;
}
.runway::before{left:calc(var(--gutter) / 2)}
.runway::after{right:calc(var(--gutter) / 2)}
@media (max-width:760px){.runway::before,.runway::after{display:none}}

/* ============ 07. 按钮 ============ */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--chalk);
  --btn-bd:var(--lane);
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;
  font-size:13px;font-weight:600;letter-spacing:.1em;
  color:var(--btn-fg);background:var(--btn-bg);
  border:1px solid var(--btn-bd);border-radius:var(--radius);
  text-decoration:none;cursor:pointer;
  transition:transform .12s ease,background .12s ease,color .12s ease,border-color .12s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--signal{--btn-bg:var(--orange);--btn-fg:#160A02;--btn-bd:var(--orange)}
.btn--signal:hover{--btn-bg:#FF8E4D;--btn-bd:#FF8E4D;color:#160A02}
.btn--ghost{--btn-fg:var(--cyan);--btn-bd:rgba(43,227,224,.5);background:rgba(43,227,224,.06)}
.btn--ghost:hover{--btn-fg:var(--paper);--btn-bd:var(--cyan);color:var(--paper)}
.btn--paper{--btn-bg:var(--paper);--btn-fg:var(--ink);--btn-bd:var(--paper)}
.btn--paper:hover{--btn-bg:var(--chalk);color:var(--ink)}

/* ============ 08. 章节与标题 ============ */
.display{
  font-family:var(--font-narrow);font-weight:800;
  font-size:clamp(40px,8vw,116px);line-height:.96;letter-spacing:-.01em;
  color:var(--chalk);
}

.section{padding-block:clamp(40px,7vw,96px)}
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,3vw,30px);align-items:start;
  margin-bottom:clamp(26px,4vw,48px);
}
.section-num{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.2em;
  color:var(--cyan);padding-top:.55em;
}
.section-title{
  font-family:var(--font-display);font-weight:500;
  font-size:clamp(26px,4vw,46px);line-height:1.24;letter-spacing:.02em;
  color:var(--paper);
}
.section-lead{margin-top:14px;max-width:62ch;color:var(--muted);font-size:16px}

.prose{max-width:68ch;font-size:17px;line-height:1.85;color:var(--chalk)}
.prose p + p{margin-top:1em}
.prose h3{
  font-family:var(--font-display);font-weight:500;
  font-size:clamp(20px,2.4vw,26px);color:var(--paper);
  margin-top:1.6em;margin-bottom:.5em;
}
.prose ul{display:grid;gap:.5em;margin-top:.8em}
.prose li{padding-left:1.2em;position:relative;color:var(--muted)}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--cyan)}
.prose strong{color:var(--paper)}

/* ============ 09. 卡片与标签 ============ */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--lane);border-radius:var(--radius);
  background:var(--slate);color:var(--chalk);
  transition:border-color .12s ease,background .12s ease,transform .12s ease;
}
.card__meta{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:var(--steel);margin-bottom:10px;
}
.card__title{
  font-family:var(--font-narrow);font-weight:700;
  font-size:19px;letter-spacing:.02em;color:var(--paper);line-height:1.4;
}
.card__body{margin-top:10px;color:var(--muted);font-size:15px}
.card--solid{background:var(--indigo);border-color:var(--lane)}
.card--glass{
  background:rgba(27,37,64,.55);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-color:rgba(43,227,224,.35);
}
.card--glass:hover{
  background:rgba(27,37,64,.82);
  border-color:var(--orange);
  transform:translateY(-2px);
}
.card--paper{background:var(--paper);border-color:var(--paper);color:var(--ink)}
.card--paper .card__title{color:var(--ink)}
.card--paper .card__body{color:#4A463C}
.card--paper .card__meta{color:#7A7364}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border-radius:var(--radius);
  border:1px solid var(--lane);background:rgba(255,255,255,.02);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;
  color:var(--steel);
}
.tag--cyan{color:var(--cyan);border-color:rgba(43,227,224,.55)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,47,.6)}
.tag--lime{color:var(--lime);border-color:rgba(198,242,78,.55)}
.tag--steel{color:var(--steel)}

.callout{
  border-left:2px solid var(--cyan);
  padding:14px 18px;
  background:linear-gradient(90deg,rgba(43,227,224,.08),transparent);
  color:var(--muted);font-size:15px;
}

/* ============ 10. 数据组件 ============ */
.stat-row{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));
  gap:1px;background:var(--lane);border:1px solid var(--lane);
}
.stat{background:var(--indigo);padding:16px 18px}
.stat__value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(24px,3.4vw,38px);line-height:1.05;letter-spacing:-.01em;
  color:var(--lime);
}
.stat__label{margin-top:6px;font-size:12px;letter-spacing:.16em;color:var(--steel)}

.data-table{width:100%;font-size:15px}
.data-table caption{
  text-align:left;padding-bottom:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--cyan);
}
.data-table th,
.data-table td{padding:10px 12px;border-bottom:1px solid var(--lane);text-align:left}
.data-table thead th{
  background:var(--indigo);color:var(--steel);
  font-size:12px;font-weight:500;letter-spacing:.16em;
}
.data-table tbody tr:nth-child(even){background:var(--slate)}
.data-table tbody tr{transition:background .12s ease}
.data-table tbody tr:hover{background:rgba(43,227,224,.08)}
.data-table__num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  color:var(--lime);text-align:right;
}

/* ============ 11. 面包屑 ============ */
.breadcrumb{margin:clamp(18px,3vw,34px) 0}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.08em}
.breadcrumb__item{color:var(--steel)}
.breadcrumb__item a{color:var(--steel);text-decoration:none}
.breadcrumb__item a:hover{color:var(--cyan)}
.breadcrumb__item[aria-current="page"]{color:var(--chalk)}
.breadcrumb__sep{color:var(--lane)}

/* ============ 12. 图片容器 ============ */
.media-frame{
  position:relative;overflow:hidden;border-radius:var(--radius);
  border:1px solid var(--lane);
  background:linear-gradient(135deg,var(--indigo),var(--ink));
  aspect-ratio:4 / 3;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.45;
  background:repeating-linear-gradient(90deg,rgba(43,227,224,.18) 0 1px,transparent 1px 64px);
}
.media-frame--wide{aspect-ratio:16 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--cut{
  clip-path:polygon(0 0,100% 0,100% calc(100% - 30px),calc(100% - 30px) 100%,0 100%);
}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:10px 14px;
  background:linear-gradient(180deg,rgba(7,11,20,0),rgba(7,11,20,.92));
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;color:var(--chalk);
}

/* ============ 13. 筛选 ============ */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px;
  padding:14px 16px;border:1px solid var(--lane);border-radius:var(--radius);
  background:rgba(27,37,64,.6);
}
.filter-bar__input{
  flex:1 1 220px;min-width:0;
  padding:10px 12px;border-radius:var(--radius);
  background:var(--ink);border:1px solid var(--lane);color:var(--chalk);
  font-size:15px;
}
.filter-bar__input::placeholder{color:var(--steel)}
.filter-bar__input:focus-visible{border-color:var(--cyan)}
.chip{
  cursor:pointer;border-radius:var(--radius);
  padding:7px 12px;border:1px solid var(--lane);background:transparent;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--steel);
  transition:color .12s ease,border-color .12s ease,background .12s ease;
}
.chip:hover{color:var(--cyan);border-color:var(--cyan)}
.chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.filter-status{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--steel)}
[data-filter-item][hidden]{display:none}

/* ============ 14. 动效 ============ */
.reveal{opacity:0;transform:translateY(8px);transition:opacity .5s ease,transform .5s ease}
.reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* ============ 15. 响应式 ============ */
@media (max-width:900px){
  .site-header__inner{
    grid-template-columns:minmax(0,1fr) auto;
    gap:12px;
    padding-block:12px 10px;
  }
  .brand-rail{display:none}
  .masthead{align-items:flex-start;text-align:left;gap:2px}
  .masthead__issue{font-size:10px;letter-spacing:.18em}
  .header-tools{gap:10px}
  .header-tools .util-link{display:none}
  .nav-toggle{display:inline-flex}

  .mainnav{
    position:absolute;left:0;right:0;top:100%;
    margin-top:0;
    padding-inline:var(--gutter);
    background:rgba(14,23,48,.98);
    border-bottom:1px solid var(--cyan);
    max-height:0;overflow:hidden;
    transition:max-height .24s ease;
  }
  .mainnav[data-open]{
    max-height:min(76vh,560px);
    overflow-y:auto;
    padding-block:10px 18px;
  }
  .mainnav__list{flex-direction:column;align-items:stretch;gap:0}
  .mainnav__link{
    justify-content:flex-start;
    padding:14px 2px;font-size:15px;
    border-bottom:1px solid var(--lane);
    border-radius:0;
  }
  .mainnav__link:hover{background:transparent;border-color:var(--lane)}
  .mainnav__link[aria-current="page"]{
    background:rgba(43,227,224,.14);
    color:var(--cyan);
    border-left:3px solid var(--cyan);
  }
  .mainnav__link[aria-current="page"] .mainnav__num{color:var(--orange)}

  .site-footer__inner{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:600px){
  .header-tools .btn{display:none}
  .site-footer__cols{grid-template-columns:minmax(0,1fr)}
  .section-head{grid-template-columns:minmax(0,1fr);gap:8px}
  .section-num{padding-top:0}
  .stat-row{grid-template-columns:repeat(auto-fit,minmax(104px,1fr))}
}