/* ==========================================================================
   易倍赛场 · emc-velocity.com.cn
   共享样式 /assets/site.css
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-900:#06131F;
  --ink-800:#0A1F30;
  --ink-700:#102B41;
  --line:#1E3B52;
  --neon:#31F0C0;
  --neon-soft:rgba(49,240,192,.12);
  --teal:#12B58C;
  --amber:#FFC24B;
  --paper:#EAF3F7;
  --mist:#9AB0BF;
  --violet:#7C8CFF;

  --rail:88px;
  --rail-md:72px;
  --bar-h:56px;
  --maxw:1400px;
  --gutter:clamp(20px,4vw,64px);
  --gap:clamp(16px,2vw,24px);

  --font-display:"Oswald","Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --ease:cubic-bezier(.2,.7,.3,1);
  --t-fast:160ms;
  --t-base:220ms;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    linear-gradient(to right,rgba(30,59,82,.42) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,59,82,.42) 1px,transparent 1px);
  background-size:88px 88px;
  background-position:0 0;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

img,
picture,
svg,
video{max-width:100%;display:block;}

a{color:var(--neon);text-decoration:none;transition:color var(--t-fast) var(--ease);}
a:hover{color:#7DFAD9;}

button,
input,
select,
textarea{font:inherit;color:inherit;}

ul,
ol{margin:0 0 1em;padding-left:1.25em;}

::selection{background:var(--neon);color:var(--ink-900);}

/* ---------- 3. 基础排版 ---------- */
h1,h2,h3,h4,h5{
  margin:0 0 .55em;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.01em;
  color:var(--paper);
  text-wrap:balance;
}

h1{font-size:clamp(34px,5.4vw,72px);}
h2{font-size:clamp(24px,3vw,40px);}
h3{font-size:clamp(19px,2vw,24px);}
h4{font-size:17px;letter-spacing:.02em;}

p{margin:0 0 1em;max-width:72ch;}
p:last-child{margin-bottom:0;}

strong{font-weight:700;color:var(--paper);}

small{font-size:13px;color:var(--mist);}

hr{border:0;border-top:1px solid var(--line);margin:32px 0;}

blockquote{
  margin:24px 0;
  padding:4px 0 4px 20px;
  border-left:2px solid var(--neon);
  color:var(--mist);
  font-size:18px;
}

code,
kbd,
samp{font-family:var(--font-mono);font-size:.9em;color:var(--neon);}

.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.01em;
}

/* ---------- 4. 无障碍与焦点 ---------- */
:focus-visible{
  outline:2px solid var(--neon);
  outline-offset:3px;
  border-radius:0;
}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
}

.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:1000;
  display:inline-block;
  padding:10px 18px;
  background:var(--neon);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  transform:translateY(-180%);
  transition:transform var(--t-base) var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--ink-900);}

/* ---------- 5. 布局工具 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.grid{
  display:grid;
  gap:var(--gap);
}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}

.prose{max-width:72ch;}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--neon);
}
.eyebrow::before{
  content:"";
  display:block;
  width:18px;height:1px;
  background:var(--neon);
}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding:28px 0 8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}
.breadcrumb a{color:var(--mist);}
.breadcrumb a:hover{color:var(--neon);}
.breadcrumb__sep{color:var(--line);}

/* ---------- 6. 按钮与标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:44px;
  padding:10px 22px;
  border:1px solid var(--line);
  border-radius:0;
  background:transparent;
  color:var(--paper);
  font-family:var(--font-display);
  font-size:14px;
  font-weight:800;
  letter-spacing:.06em;
  line-height:1;
  text-align:center;
  cursor:pointer;
  transition:background-color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease),
             color var(--t-fast) var(--ease);
}
.btn:hover{color:var(--paper);border-color:var(--neon);background:rgba(49,240,192,.08);}

.btn--primary{
  background:var(--amber);
  border-color:var(--amber);
  color:var(--ink-900);
}
.btn--primary:hover{
  background:#FFD37A;
  border-color:#FFD37A;
  color:var(--ink-900);
}

.btn--ghost{
  border-color:var(--teal);
  color:var(--neon);
}
.btn--ghost:hover{
  border-color:var(--neon);
  background:rgba(49,240,192,.1);
  color:var(--neon);
}

.btn--block{width:100%;}

.chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:8px 16px;
  border:1px solid var(--line);
  background:var(--ink-800);
  color:var(--mist);
  font-size:14px;
  line-height:1.2;
  cursor:pointer;
  transition:border-color var(--t-fast) var(--ease),
             color var(--t-fast) var(--ease),
             background-color var(--t-fast) var(--ease);
}
.chip:hover{border-color:var(--neon);color:var(--paper);}
.chip[aria-pressed="true"]{
  border-color:var(--neon);
  background:rgba(49,240,192,.1);
  color:var(--neon);
}
.chip[aria-pressed="true"]::before{
  content:"✓";
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--neon);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
  white-space:nowrap;
}
.tag--amber{border-color:rgba(255,194,75,.5);color:var(--amber);}
.tag--violet{border-color:rgba(124,140,255,.5);color:var(--violet);}
.tag--neon{border-color:rgba(49,240,192,.5);color:var(--neon);}

/* ---------- 7. 分段标签页 ---------- */
.segment{
  display:flex;
  flex-wrap:nowrap;
  gap:0;
  overflow-x:auto;
  border-bottom:1px solid var(--line);
  scrollbar-width:thin;
}
.segment__btn{
  position:relative;
  flex:0 0 auto;
  min-height:48px;
  padding:12px 20px;
  border:0;
  border-bottom:2px solid transparent;
  background:transparent;
  color:var(--mist);
  font-family:var(--font-display);
  font-size:14px;
  font-weight:800;
  letter-spacing:.1em;
  white-space:nowrap;
  cursor:pointer;
  transition:color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease);
}
.segment__btn:hover{color:var(--paper);}
.segment__btn[aria-selected="true"]{
  color:var(--paper);
  border-bottom-color:var(--neon);
}

[data-panel][hidden]{display:none !important;}
[data-panel].is-active{display:block;}

/* ---------- 8. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 9;
  background:var(--ink-700);
  border:1px solid var(--line);
}
.media-frame img,
.media-frame picture{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.7) contrast(1.05);
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame__caption{
  position:absolute;
  inset:auto 0 0 0;
  padding:10px 14px;
  border-top:1px solid var(--line);
  background:rgba(6,19,31,.82);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}

/* ---------- 9. 显现动效 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  will-change:opacity,transform;
}
[data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 10. 页头 · 左侧赛道轨道 ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  z-index:120;
  display:flex;
  flex-direction:column;
  width:var(--rail);
  background:var(--ink-800);
  border-right:1px solid var(--line);
}

.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:12px;
  padding:18px 8px 16px;
  border-bottom:1px solid var(--line);
  color:var(--paper);
  text-decoration:none;
}
.brand:hover{color:var(--paper);}

.brand__mark{
  display:inline-block;
  padding:6px 7px;
  background:var(--neon);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  line-height:1;
  letter-spacing:.04em;
}

.brand__name{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-display);
  font-size:14px;
  font-weight:800;
  letter-spacing:.24em;
  line-height:1.4;
  color:var(--paper);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:0 12px;
  border:1px solid var(--line);
  background:transparent;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.nav-toggle:hover{border-color:var(--neon);color:var(--neon);}

.nav-toggle__box{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:18px;
  height:14px;
}
.nav-toggle__bar{
  display:block;
  width:100%;
  height:2px;
  background:currentColor;
  transition:transform var(--t-fast) var(--ease),opacity var(--t-fast) var(--ease);
}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(1){transform:translateY(6px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(2){opacity:0;}
.site-header[data-open="true"] .nav-toggle__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.rail-nav{
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding:16px 0;
  overflow-y:auto;
  overscroll-behavior:contain;
}
.rail-nav__list{
  display:flex;
  flex-direction:column;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.rail-nav__item{position:relative;}
.rail-nav__link{
  position:relative;
  display:grid;
  place-items:center;
  width:100%;
  min-height:64px;
  padding:14px 0;
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:500;
  line-height:1.5;
  letter-spacing:.14em;
  color:var(--mist);
  text-decoration:none;
  transition:color var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease);
}
.rail-nav__link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:3px;
  height:0;
  background:var(--neon);
  transform:translateY(-50%);
  transition:height var(--t-base) var(--ease);
}
.rail-nav__link::after{
  content:attr(data-index);
  position:absolute;
  top:10px;
  right:10px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:0;
  color:var(--line);
  transition:color var(--t-fast) var(--ease);
}
.rail-nav__link:hover{
  color:var(--paper);
  background:rgba(49,240,192,.07);
}
.rail-nav__link:hover::after{color:var(--teal);}
.rail-nav__link[aria-current="page"]{
  color:var(--neon);
  background:rgba(49,240,192,.1);
}
.rail-nav__link[aria-current="page"]::before{height:32px;}
.rail-nav__link[aria-current="page"]::after{color:var(--amber);}

.rail-foot{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
  margin-top:auto;
  padding:16px 0 20px;
  border-top:1px solid var(--line);
}
.rail-foot__dot{
  width:8px;
  height:8px;
  background:var(--neon);
  box-shadow:0 0 0 4px rgba(49,240,192,.14);
  animation:rail-pulse 2.4s var(--ease) infinite;
}
.rail-foot__text{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--mist);
}
@keyframes rail-pulse{
  0%,100%{opacity:1;}
  50%{opacity:.4;}
}

.rail-progress{
  position:absolute;
  top:0;
  right:0;
  bottom:0;
  width:2px;
  background:var(--neon);
  transform-origin:top center;
  transform:scaleY(var(--progress,0));
  opacity:.9;
  pointer-events:none;
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,128px);
  padding:clamp(40px,6vw,72px) 0 24px;
  background:var(--ink-800);
  border-top:1px solid var(--line);
  color:var(--paper);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:var(--gutter);
  width:clamp(64px,12vw,160px);
  height:2px;
  background:var(--neon);
}

.footer__inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.footer__grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(28px,4vw,48px);
}

.footer__eyebrow{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.26em;
  color:var(--teal);
}

.footer__wordmark{
  margin:0 0 12px;
  font-family:var(--font-display);
  font-size:clamp(28px,4vw,44px);
  font-weight:900;
  line-height:1;
  letter-spacing:.04em;
  color:var(--paper);
}

.footer__summary{
  margin:0;
  max-width:34ch;
  color:var(--mist);
  font-size:14px;
  line-height:1.8;
}

.footer__title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--mist);
}

.footer__list{
  display:grid;
  gap:4px;
  margin:0;
  padding:0;
  list-style:none;
}

.footer__link{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  color:var(--paper);
  font-size:14px;
  text-decoration:none;
}
.footer__link:hover{color:var(--neon);}

.contact-list{
  margin:0;
  display:grid;
  gap:0;
}
.contact-list__row{
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  gap:10px;
  align-items:baseline;
  padding-bottom:10px;
  margin-bottom:10px;
  border-bottom:1px solid rgba(30,59,82,.75);
}
.contact-list__row:last-child{
  margin-bottom:0;
  padding-bottom:0;
  border-bottom:0;
}
.contact-list__label{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
}
.contact-list__value{
  margin:0;
  font-size:14px;
  line-height:1.65;
  color:var(--paper);
  word-break:break-word;
}
.contact-list__value--num{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
}

.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(32px,5vw,56px);
  padding-top:18px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}
.footer__legal,
.footer__record{margin:0;color:var(--mist);}

/* ---------- 12. 断点：平板 ---------- */
@media (min-width:768px) and (max-width:1023.98px){
  body{padding-left:var(--rail-md);}

  .site-header{width:var(--rail-md);}
  .brand{padding:14px 6px 12px;gap:10px;}
  .brand__name{font-size:12px;letter-spacing:.2em;}
  .rail-nav__link{
    min-height:58px;
    padding:10px 0;
    font-size:12.5px;
    letter-spacing:.1em;
  }
  .rail-nav__link::after{right:6px;font-size:9px;}
  .rail-foot__text{font-size:9px;}

  .footer__grid{grid-template-columns:1.4fr .7fr .7fr 1fr;}
}

/* ---------- 13. 断点：桌面 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail);}
  .footer__grid{grid-template-columns:1.6fr .6fr .6fr 1.1fr;}
}

/* ---------- 14. 断点：手机 ---------- */
@media (max-width:767.98px){
  body{
    padding-top:var(--bar-h);
    background-size:44px 44px;
  }

  .site-header{
    top:0;
    right:0;
    bottom:auto;
    left:0;
    width:100%;
    height:var(--bar-h);
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    padding:0 12px 0 14px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }

  .brand{
    flex-direction:row;
    align-items:center;
    gap:10px;
    padding:0;
    border-bottom:0;
  }
  .brand__name{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.12em;
  }

  .nav-toggle{display:inline-flex;}

  .rail-nav{
    position:fixed;
    top:var(--bar-h);
    left:0;
    bottom:0;
    z-index:130;
    width:min(84vw,320px);
    justify-content:flex-start;
    padding:24px 0;
    background:var(--ink-800);
    border-right:1px solid var(--line);
    box-shadow:24px 0 48px rgba(6,19,31,.55);
    transform:translateX(-100%);
    transition:transform var(--t-base) var(--ease);
  }
  .site-header[data-open="true"] .rail-nav{transform:translateX(0);}

  .rail-nav__link{
    min-height:52px;
    padding:12px 24px;
    place-items:center start;
    writing-mode:horizontal-tb;
    font-size:16px;
    letter-spacing:.08em;
    border-left:2px solid transparent;
  }
  .rail-nav__link::before{
    top:0;
    left:0;
    width:2px;
    height:100%;
    transform:scaleY(0);
    transform-origin:center top;
    transition:transform var(--t-base) var(--ease);
  }
  .rail-nav__link[aria-current="page"]::before{
    height:100%;
    transform:scaleY(1);
  }
  .rail-nav__link::after{
    top:50%;
    right:18px;
    transform:translateY(-50%);
    font-size:11px;
  }

  .rail-foot{display:none;}
  .rail-progress{display:none;}

  .skip-link{
    top:auto;
    bottom:16px;
    left:16px;
  }
  .skip-link:focus{transform:none;}

  .footer__grid{grid-template-columns:1fr;}
  .footer__bottom{font-size:11px;}
  .footer__summary{max-width:none;}
}

/* ---------- 15. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  [data-reveal]{
    opacity:1 !important;
    transform:none !important;
  }
  .rail-progress{transition:none;}
}