/* ============ 1. 重置 ============ */
*,
*::before,
*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:24px}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
::selection{background:var(--orange);color:#0A0C0D}

/* ============ 2. 变量 ============ */
:root{
  --ink:#0A0C0D;
  --panel:#111516;
  --card:#191F21;
  --fog:#F4F6F5;
  --mist:#B7C0C2;
  --steel:#738084;
  --orange:#FF5A1F;
  --signal:#FFC53D;
  --green:#2F4A3F;
  --red:#C8493F;
  --yellow:#D9A62E;
  --glass:rgba(255,255,255,.08);
  --line:rgba(183,192,194,.16);
  --line-strong:rgba(183,192,194,.30);

  --font-display:"Barlow Condensed","Arial Narrow","Noto Sans SC","PingFang SC",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-data:"JetBrains Mono","Roboto Mono",ui-monospace,"SFMono-Regular",monospace;

  --shell:1280px;
  --gutter:48px;
  --r-sm:4px;
  --r-md:10px;
  --r-lg:16px;

  --dur-micro:120ms;
  --dur-panel:220ms;
  --dur-page:320ms;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ============ 3. 页面基底 ============ */
body{
  min-height:100vh;
  background-color:var(--ink);
  color:var(--fog);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.7;
  letter-spacing:.01em;
  background-image:
    radial-gradient(circle at 84% -8%, rgba(255,90,31,.16), transparent 46%),
    radial-gradient(circle at 4% 6%, rgba(47,74,63,.42), transparent 40%),
    repeating-linear-gradient(0deg, rgba(183,192,194,.045) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(90deg, rgba(183,192,194,.045) 0 1px, transparent 1px 72px);
  background-attachment:fixed;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(180deg, rgba(255,255,255,.028) 0, rgba(255,255,255,.028) 1px, transparent 1px, transparent 4px);
  opacity:.75;
}
#main-content{display:block;position:relative;z-index:1;outline:none}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:-.02em;
  line-height:1.08;
  color:var(--fog);
}

/* ============ 4. 布局基元 ============ */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
  position:relative;
}
.grid{display:grid;gap:24px}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--3-6-3{grid-template-columns:3fr 6fr 3fr}
.grid--4-8{grid-template-columns:4fr 8fr}

/* ============ 5. 跳转链接 ============ */
.skip-link{
  position:fixed;
  left:16px;
  top:-90px;
  z-index:200;
  padding:10px 18px;
  background:var(--signal);
  color:#0A0C0D;
  font-weight:700;
  font-size:13px;
  letter-spacing:.08em;
  border-radius:0 0 var(--r-sm) var(--r-sm);
  transition:top var(--dur-micro) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{top:0;outline:2px solid var(--fog);outline-offset:2px}

/* ============ 6. 焦点 ============ */
:focus-visible{
  outline:2px solid var(--signal);
  outline-offset:3px;
  border-radius:2px;
}

/* ============ 7. 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:.72em 1.4em;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  line-height:1.2;
  border:1px solid transparent;
  border-radius:999px;
  white-space:nowrap;
  transition:filter var(--dur-micro) var(--ease),
             background-color var(--dur-micro) var(--ease),
             border-color var(--dur-micro) var(--ease),
             color var(--dur-micro) var(--ease);
}
.btn--primary{
  background:linear-gradient(100deg,var(--orange),var(--signal));
  color:#0A0C0D;
  box-shadow:0 8px 24px -10px rgba(255,90,31,.75);
}
.btn--primary:hover{filter:brightness(1.08)}
.btn--ghost{
  background:var(--glass);
  border-color:var(--line-strong);
  color:var(--fog);
  backdrop-filter:blur(10px);
}
.btn--ghost:hover{border-color:var(--orange);color:var(--orange)}
.btn--block{width:100%}

/* ============ 8. 头部 ============ */
.site-header{
  position:relative;
  z-index:50;
  background:linear-gradient(180deg, rgba(17,21,22,.98), rgba(10,12,13,.94));
  border-bottom:1px solid var(--line);
}
.header-rail{
  border-bottom:1px solid var(--line);
  background:rgba(10,12,13,.72);
}
.header-rail__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  min-height:36px;
  font-family:var(--font-data);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--steel);
}
.header-rail__note{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--mist);
}
.pulse-dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 0 rgba(255,90,31,.65);
  animation:pulse 2.6s var(--ease) infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(255,90,31,.55)}
  70%{box-shadow:0 0 0 8px rgba(255,90,31,0)}
  100%{box-shadow:0 0 0 0 rgba(255,90,31,0)}
}
.header-rail__right{
  display:flex;
  align-items:center;
  gap:20px;
}
.header-rail__quick{
  color:var(--signal);
  border-bottom:1px solid rgba(255,197,61,.35);
  padding-bottom:1px;
  transition:color var(--dur-micro) var(--ease),border-color var(--dur-micro) var(--ease);
}
.header-rail__quick:hover{color:var(--fog);border-color:var(--fog)}
.utility-nav{
  display:flex;
  align-items:center;
  gap:16px;
}
.utility-nav a{
  color:var(--mist);
  transition:color var(--dur-micro) var(--ease);
}
.utility-nav a:hover{color:var(--signal)}

/* --- 刊头 --- */
.masthead__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:24px;
  padding-block:20px 18px;
}
.masthead__coord{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding-left:14px;
  border-left:1px solid var(--line);
  font-family:var(--font-data);
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--steel);
  line-height:1.5;
}
.masthead__core{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:7px;
  text-align:center;
}
.masthead__kicker{
  font-family:var(--font-data);
  font-size:10.5px;
  letter-spacing:.28em;
  color:var(--steel);
}
.masthead__brand{
  display:inline-flex;
  align-items:baseline;
  gap:12px;
  font-family:var(--font-display);
  font-size:clamp(30px,4.4vw,48px);
  font-weight:600;
  letter-spacing:.08em;
  line-height:.95;
  color:var(--fog);
  transition:color var(--dur-micro) var(--ease);
}
.masthead__brand:hover{color:var(--orange)}
.masthead__mark{
  font-family:var(--font-data);
  font-size:.4em;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--orange);
  border:1px solid rgba(255,90,31,.55);
  border-radius:2px;
  padding:.28em .5em .22em;
  transform:translateY(-.22em);
}
.masthead__quick a{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--signal);
  border-bottom:1px solid rgba(255,197,61,.3);
  padding-bottom:2px;
  transition:color var(--dur-micro) var(--ease),border-color var(--dur-micro) var(--ease);
}
.masthead__quick a:hover{color:var(--fog);border-color:var(--fog)}
.masthead__actions{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:12px;
}

/* --- 菜单按钮 --- */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:10px 15px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  background:var(--glass);
  color:var(--fog);
  font-size:12px;
  letter-spacing:.12em;
  transition:border-color var(--dur-micro) var(--ease),color var(--dur-micro) var(--ease);
}
.nav-toggle:hover{border-color:var(--orange);color:var(--orange)}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  width:14px;
}
.nav-toggle__bars i{
  display:block;
  height:2px;
  background:currentColor;
  border-radius:1px;
  transition:transform var(--dur-micro) var(--ease),opacity var(--dur-micro) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* --- 主导航 --- */
.primary-nav{
  border-top:1px solid var(--line);
  background:rgba(10,12,13,.78);
  backdrop-filter:blur(10px);
}
.primary-nav__list{
  display:flex;
  justify-content:center;
  flex-wrap:wrap;
  gap:clamp(16px,2.8vw,44px);
  padding-block:12px;
}
.primary-nav__link{
  position:relative;
  display:inline-block;
  padding:6px 2px;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--mist);
  transition:color var(--dur-micro) var(--ease);
}
.primary-nav__link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--dur-panel) var(--ease),background-color var(--dur-micro) var(--ease);
}
.primary-nav__link:hover{color:var(--fog)}
.primary-nav__link:hover::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--fog)}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--signal)}

/* ============ 9. 页脚 ============ */
.site-footer{
  position:relative;
  z-index:2;
  margin-top:80px;
  background:linear-gradient(180deg, rgba(17,21,22,.72), rgba(10,12,13,1));
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  right:0;
  height:2px;
  background:linear-gradient(90deg,var(--orange),var(--signal) 26%,rgba(183,192,194,.15) 72%,transparent);
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);
  gap:clamp(32px,5vw,72px);
  padding-block:clamp(40px,6vw,64px) 40px;
}
.footer-brand__mark{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-family:var(--font-display);
  font-size:clamp(26px,3vw,34px);
  font-weight:600;
  letter-spacing:.08em;
  line-height:1;
  color:var(--fog);
}
.footer-brand__mark span{
  font-family:var(--font-data);
  font-size:.38em;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--orange);
  border:1px solid rgba(255,90,31,.5);
  border-radius:2px;
  padding:.28em .5em .22em;
  transform:translateY(-.2em);
}
.footer-brand__summary{
  margin-top:16px;
  max-width:34ch;
  color:var(--mist);
  font-size:14.5px;
  line-height:1.75;
}
.footer-brand__region{
  margin-top:14px;
  font-family:var(--font-data);
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--steel);
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:28px;
}
.footer-col__title{
  font-family:var(--font-data);
  font-size:10.5px;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--signal);
  margin-bottom:16px;
}
.footer-links li + li{margin-top:10px}
.footer-links a{
  display:inline-block;
  font-size:14px;
  color:var(--mist);
  padding-block:2px;
  transition:color var(--dur-micro) var(--ease);
}
.footer-links a:hover{color:var(--orange)}
.footer-contact-block{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:16px 28px;
  padding-block:24px;
  border-top:1px dashed var(--line-strong);
  border-bottom:1px dashed var(--line-strong);
}
.footer-contact-block__item{
  display:flex;
  flex-direction:column;
  gap:5px;
  font-family:var(--font-data);
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--mist);
  word-break:break-word;
}
.footer-contact-block__item span{
  font-size:10px;
  letter-spacing:.2em;
  color:var(--steel);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-block:20px 30px;
  font-family:var(--font-data);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--steel);
}

/* ============ 10. 通用内容组件 ============ */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  padding-block:20px;
  font-family:var(--font-data);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--steel);
}
.breadcrumbs li{display:flex;align-items:center;gap:10px}
.breadcrumbs li + li::before{content:"›";color:var(--steel);opacity:.7}
.breadcrumbs a{color:var(--mist);transition:color var(--dur-micro) var(--ease)}
.breadcrumbs a:hover{color:var(--orange)}
.breadcrumbs [aria-current="page"]{color:var(--fog)}

.prose{
  max-width:68ch;
  color:var(--mist);
  font-size:16.5px;
  line-height:1.8;
}
.prose > * + *{margin-top:1.05em}
.prose h2,
.prose h3{
  color:var(--fog);
  margin-top:1.9em;
  letter-spacing:-.01em;
}
.prose h2{font-size:clamp(24px,3vw,32px)}
.prose h3{font-size:clamp(19px,2.2vw,23px)}
.prose strong{color:var(--fog);font-weight:600}
.prose a{
  color:var(--signal);
  border-bottom:1px solid rgba(255,197,61,.35);
  transition:color var(--dur-micro) var(--ease),border-color var(--dur-micro) var(--ease);
}
.prose a:hover{color:var(--orange);border-color:var(--orange)}
.prose ul,
.prose ol{padding-left:1.25em;line-height:1.8}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.45em}
.prose blockquote{
  border-left:2px solid var(--orange);
  padding-left:18px;
  color:var(--fog);
}

/* --- 媒体容器 --- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  isolation:isolate;
  aspect-ratio:16 / 9;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background-color:var(--card);
  background-image:
    linear-gradient(135deg, rgba(47,74,63,.6), rgba(10,12,13,.94) 62%),
    repeating-linear-gradient(90deg, rgba(183,192,194,.08) 0 1px, transparent 1px 42px);
}
.media > img,
.media > picture,
.media > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.85) brightness(.82) contrast(1.05);
}
.media::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:
    repeating-linear-gradient(180deg, rgba(255,255,255,.045) 0 1px, transparent 1px 4px),
    radial-gradient(circle at 80% 8%, rgba(255,90,31,.3), transparent 58%);
  mix-blend-mode:screen;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:linear-gradient(115deg, transparent 44%, rgba(255,197,61,.14) 45%, transparent 62%);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}
.media--angle{clip-path:polygon(0 0,100% 0,100% 91%,0 100%)}
.media__label{
  position:absolute;
  left:12px;
  bottom:12px;
  z-index:2;
  padding:4px 9px;
  background:rgba(10,12,13,.78);
  border-left:2px solid var(--signal);
  font-family:var(--font-data);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--signal);
}
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:22px;
}
.card--glass{
  background:var(--glass);
  border-color:rgba(255,255,255,.14);
  backdrop-filter:blur(14px);
}
.eyebrow{
  display:inline-block;
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--signal);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(183,192,194,.1);
  font-family:var(--font-data);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--mist);
}
.tag--signal{
  background:var(--signal);
  border-color:transparent;
  color:#1A1204;
  font-weight:700;
}
.tag--live{
  background:rgba(255,90,31,.14);
  border-color:rgba(255,90,31,.45);
  color:var(--orange);
}
.index{
  font-family:var(--font-data);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--steel);
}
.figure{
  display:inline-block;
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums;
  font-weight:700;
  font-size:clamp(28px,4vw,44px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--fog);
}
.figure--orange{color:var(--orange)}
.figure--signal{color:var(--signal)}
.figure--red{color:var(--red)}
.figure--yellow{color:var(--yellow)}

/* --- 分段切换 --- */
.tabs{position:relative}
.tabs__list{
  display:flex;
  gap:4px;
  overflow-x:auto;
  border-bottom:1px solid var(--line);
  scrollbar-width:thin;
  scrollbar-color:var(--steel) transparent;
}
.tabs__list::-webkit-scrollbar{height:4px}
.tabs__list::-webkit-scrollbar-thumb{background:var(--steel);border-radius:2px}
.tabs__tab{
  flex:0 0 auto;
  padding:12px 18px;
  margin-bottom:-1px;
  font-size:13px;
  letter-spacing:.06em;
  color:var(--mist);
  border-left:2px solid transparent;
  border-bottom:2px solid transparent;
  transition:color var(--dur-micro) var(--ease),
             background-color var(--dur-micro) var(--ease),
             border-color var(--dur-micro) var(--ease);
}
.tabs__tab:hover{color:var(--fog);background:rgba(255,255,255,.04)}
.tabs__tab[aria-selected="true"]{
  color:var(--fog);
  border-left-color:var(--orange);
  border-bottom-color:var(--signal);
  background:linear-gradient(90deg, rgba(255,90,31,.14), transparent 82%);
}
.tabs__panel{padding-top:24px}
.tabs__panel[hidden]{display:none}

/* --- 阅读进度条 --- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:150;
  pointer-events:none;
  opacity:0;
  transition:opacity var(--dur-panel) var(--ease);
}
.scroll-progress[data-active]{opacity:1}
.scroll-progress__bar{
  height:100%;
  width:100%;
  background:linear-gradient(90deg,var(--orange),var(--signal));
  transform:scaleX(0);
  transform-origin:0 50%;
  will-change:transform;
}

/* ============ 11. 响应式 ============ */
@media (max-width:1080px){
  :root{--gutter:32px}
  .masthead__coord{display:none}
}
@media (max-width:960px){
  .grid--7-5,
  .grid--3-6-3,
  .grid--4-8{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:900px){
  .masthead__inner{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:12px;
    padding-block:18px 16px;
  }
  .masthead__actions{width:100%;justify-content:center;gap:10px}
  .masthead__cta{flex:1 1 auto;max-width:280px}
  .nav-toggle{display:inline-flex}

  .primary-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    max-height:0;
    overflow:hidden;
    opacity:0;
    border-block:1px solid var(--line);
    background:rgba(17,21,22,.98);
    backdrop-filter:blur(16px);
    transition:max-height var(--dur-panel) var(--ease),opacity var(--dur-panel) var(--ease);
  }
  .primary-nav[data-open]{
    max-height:min(64vh,460px);
    overflow-y:auto;
    opacity:1;
  }
  .primary-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding-block:8px;
  }
  .primary-nav__link{
    display:block;
    padding:15px 4px;
    font-size:14.5px;
    border-bottom:1px solid var(--line);
  }
  .primary-nav__link::after{display:none}
  .primary-nav__link[aria-current="page"]{
    color:var(--orange);
    box-shadow:inset 3px 0 0 var(--orange);
    padding-left:14px;
  }
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  :root{--gutter:18px}
  body{font-size:16px}
  .header-rail__inner{font-size:10px;letter-spacing:.1em;min-height:32px}
  .utility-nav{display:none}
  .masthead__kicker{letter-spacing:.2em}
  .footer-cols{grid-template-columns:1fr;gap:24px}
  .footer-contact-block{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:6px}
  .tabs__tab{padding:11px 14px;font-size:12.5px}
}

/* ============ 12. 降低动态 ============ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  body::before{display:none}
  .pulse-dot{animation:none}
}