*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-block-start:calc(var(--topbar-h,60px) + 16px)}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,h6,p,ol,ul,dl,dd,figure,blockquote,fieldset{margin:0}
ol,ul{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse}
hr{border:0;border-block-start:1px solid var(--line);margin:0}

:root{
  --ink-900:#071A2B;
  --ink-800:#0C263B;
  --ink-700:#10314A;
  --cyan:#2FE3D0;
  --cyan-soft:#B8F3EC;
  --amber:#F2B84B;
  --sand:#F4E9D4;
  --ember:#E8654F;
  --haze:#6F8CA3;
  --line:rgba(111,140,163,.30);
  --line-soft:rgba(111,140,163,.16);
  --line-strong:rgba(111,140,163,.58);
  --rail-w:268px;
  --topbar-h:60px;
  --gutter:clamp(18px,4vw,56px);
  --font-display:"Oswald","Barlow Condensed","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --step--1:clamp(.76rem,.74rem + .1vw,.84rem);
  --step-0:clamp(1rem,.97rem + .16vw,1.06rem);
  --step-1:clamp(1.12rem,1.04rem + .38vw,1.34rem);
  --step-2:clamp(1.42rem,1.2rem + .95vw,1.95rem);
  --step-3:clamp(1.95rem,1.42rem + 2.1vw,3.05rem);
  --step-4:clamp(2.6rem,1.55rem + 4.6vw,5.4rem);
  --ease:cubic-bezier(.22,.61,.36,1);
}

body{
  min-height:100vh;
  background:var(--ink-900);
  color:var(--sand);
  font-family:var(--font-body);
  font-size:var(--step-0);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
@media (min-width:1024px){body{padding-inline-start:var(--rail-w)}}
@media (max-width:1023px){body{padding-block-start:var(--topbar-h)}}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
:focus:not(:focus-visible){outline:none}

/* ---------- 字体工具 ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  inset-inline-start:14px;
  inset-block-start:-120px;
  z-index:300;
  display:inline-block;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--ink-900);
  border:1px solid var(--ink-900);
  font-family:var(--font-mono);
  font-size:.8rem;
  letter-spacing:.08em;
  transition:inset-block-start .16s var(--ease);
}
.skip-link:focus-visible{inset-block-start:14px;color:var(--ink-900)}

/* ---------- 头部：侧边轨道 ---------- */
.site-header{
  z-index:120;
  background:var(--ink-800);
  color:var(--sand);
  border-color:var(--line);
  border-style:solid;
  border-width:0;
}
.site-header::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(to right,rgba(111,140,163,.07) 1px,transparent 1px);
  background-size:52px 100%;
}
@media (min-width:1024px){
  .site-header{
    position:fixed;
    inset-block:0;
    inset-inline-start:0;
    width:var(--rail-w);
    border-inline-end-width:1px;
  }
}
@media (max-width:1023px){
  .site-header{
    position:fixed;
    inset-block-start:0;
    inset-inline:0;
    height:var(--topbar-h);
    border-block-end-width:1px;
  }
  .site-header::after{background-size:34px 100%}
}

.rail-inner{position:relative;z-index:1;height:100%}
@media (min-width:1024px){
  .rail-inner{
    display:flex;
    flex-direction:column;
    gap:0;
    padding:24px 18px 20px;
    overflow-y:auto;
    overscroll-behavior:contain;
  }
}
@media (max-width:1023px){
  .rail-inner{display:flex;align-items:center;gap:12px;padding:0 16px}
}

.rail-top{display:flex;flex-direction:column;gap:10px}
@media (min-width:1024px){
  .rail-top{padding-block-end:16px;border-block-end:1px solid var(--line)}
}
@media (max-width:1023px){
  .rail-top{flex:1;min-width:0;padding:0;border:0}
}

.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-mark{
  flex:none;
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  background:var(--amber);
  color:var(--ink-900);
  font-family:var(--font-display);
  font-size:1.02rem;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1;
}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0;line-height:1.25}
.brand-name{
  font-family:var(--font-display);
  font-size:1.06rem;
  font-weight:700;
  letter-spacing:.07em;
  color:var(--sand);
  white-space:nowrap;
}
.brand-desc{font-size:.68rem;letter-spacing:.04em;color:var(--haze);white-space:nowrap}
@media (max-width:1023px){
  .brand-mark{width:30px;height:30px;font-size:.9rem}
  .brand-name{font-size:.98rem}
  .brand-desc{display:none}
}

.rail-meta{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--haze);
}
.rail-meta .mono{color:var(--cyan)}
@media (max-width:1023px){.rail-meta{display:none}}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 11px;
  border:1px solid var(--line-strong);
  color:var(--cyan-soft);
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.08em;
  transition:border-color .14s var(--ease),color .14s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle-bar{display:block;width:100%;height:1.5px;background:currentColor;transition:transform .16s var(--ease),opacity .16s var(--ease)}
.nav-toggle-label{white-space:nowrap}
@media (max-width:1023px){.nav-toggle{display:inline-flex;flex:none}}
.site-header[data-open="true"] .nav-toggle-bar:nth-child(1){transform:translateY(4.5px) 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(-4.5px) rotate(-45deg)}

.site-nav{position:relative;z-index:2}
@media (min-width:1024px){.site-nav{margin-block-start:18px;flex:1 1 auto}}
@media (max-width:1023px){
  .site-nav{
    position:fixed;
    inset-block-start:var(--topbar-h);
    inset-inline:0;
    max-height:calc(100vh - var(--topbar-h));
    overflow-y:auto;
    padding:10px 16px 22px;
    background:var(--ink-800);
    border-block-end:1px solid var(--line-strong);
    box-shadow:0 18px 32px rgba(3,12,20,.55);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity .16s var(--ease),transform .16s var(--ease),visibility .16s;
  }
  .site-header[data-open="true"] .site-nav{
    opacity:1;
    visibility:visible;
    transform:none;
    pointer-events:auto;
  }
}

.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-item{display:block}
.nav-link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:9px 10px;
  border-inline-start:2px solid transparent;
  color:var(--sand);
  transition:background-color .14s var(--ease),color .14s var(--ease),border-color .14s var(--ease);
}
.nav-idx{
  flex:none;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--haze);
  transition:color .14s var(--ease);
}
.nav-label{
  font-family:var(--font-display);
  font-size:.95rem;
  font-weight:500;
  letter-spacing:.05em;
}
.nav-link:hover,.nav-link:focus-visible{
  background:rgba(184,243,236,.07);
  color:var(--cyan-soft);
  border-inline-start-color:var(--cyan);
}
.nav-link[aria-current="page"]{
  background:rgba(47,227,208,.11);
  color:var(--cyan);
  border-inline-start-color:var(--cyan);
}
.nav-link[aria-current="page"] .nav-idx{color:var(--amber)}
@media (max-width:1023px){
  .nav-link{padding:13px 10px}
  .nav-label{font-size:1.02rem}
}

.rail-foot{
  display:flex;
  flex-direction:column;
  gap:6px;
  margin-block-start:auto;
  padding-block-start:16px;
  border-block-start:1px solid var(--line);
}
.login-link{
  align-self:flex-start;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.06em;
  color:var(--haze);
  border-block-end:1px solid transparent;
  transition:color .14s var(--ease),border-color .14s var(--ease);
}
.login-link:hover,.login-link:focus-visible{color:var(--cyan);border-block-end-color:var(--cyan)}
.rail-note{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.16em;
  color:rgba(111,140,163,.8);
}
@media (max-width:1023px){.rail-foot{display:none}}

.rail-progress{position:absolute;z-index:3;background:transparent}
.rail-progress-bar{
  display:block;
  width:100%;
  height:100%;
  background:var(--cyan);
  box-shadow:0 0 10px rgba(47,227,208,.55);
  transform-origin:top;
  transform:scaleY(var(--progress,0));
}
@media (min-width:1024px){.rail-progress{inset-block:0;inset-inline-end:-1px;width:2px}}
@media (max-width:1023px){
  .rail-progress{inset-block-end:-1px;inset-inline:0;height:2px}
  .rail-progress-bar{transform-origin:left;transform:scaleX(var(--progress,0))}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink-800);
  color:var(--sand);
  border-block-start:1px solid var(--line);
  padding:clamp(30px,5vw,60px) var(--gutter) 24px;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset-block-start:0;
  inset-inline:0;
  height:1px;
  background:linear-gradient(to right,var(--cyan) 0 64px,transparent 64px);
  opacity:.85;
}
.footer-inner{max-width:1400px;margin-inline:auto}
.footer-top{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(24px,3.4vw,44px);
}
@media (min-width:720px){
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{grid-column:1 / -1}
}
@media (min-width:1024px){
  .footer-top{grid-template-columns:1.05fr 1.25fr 1.55fr}
  .footer-contact{grid-column:auto}
}

.footer-brand{display:flex;flex-direction:column;gap:8px}
.footer-wordmark{
  font-family:var(--font-display);
  font-size:var(--step-2);
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.15;
  color:var(--sand);
}
.footer-tagline{font-size:.86rem;color:var(--haze);max-width:24ch}
.footer-stamp{
  margin-block-start:10px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.2em;
  color:var(--cyan);
}

.footer-heading{
  margin-block-end:14px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--haze);
}

.footer-list{display:grid;grid-template-columns:1fr;gap:0}
@media (min-width:520px){.footer-list{grid-template-columns:repeat(2,minmax(0,1fr));column-gap:22px}}
.footer-item{
  display:flex;
  align-items:baseline;
  gap:9px;
  padding-block:8px;
  border-block-end:1px solid var(--line-soft);
  font-size:.9rem;
}
.footer-idx{
  flex:none;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  color:var(--amber);
}
.footer-item a{transition:color .14s var(--ease)}
.footer-item a:hover,.footer-item a:focus-visible{color:var(--cyan)}

.contact-list{display:grid;gap:9px}
.contact-row{
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  gap:10px;
  align-items:baseline;
}
.contact-row dt{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  color:var(--haze);
}
.contact-row dd{
  margin:0;
  font-size:.88rem;
  line-height:1.65;
  color:var(--sand);
  overflow-wrap:anywhere;
}
.contact-note{
  margin-block-start:14px;
  padding-block-start:12px;
  border-block-start:1px solid var(--line-soft);
  font-size:.8rem;
  line-height:1.65;
  color:var(--haze);
  max-width:42ch;
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
  margin-block-start:clamp(26px,4vw,44px);
  padding-block-start:16px;
  border-block-start:1px solid var(--line);
}
.footer-legal{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--haze);
}

/* ---------- 通用容器与网格 ---------- */
.container{max-width:1240px;margin-inline:auto;padding-inline:var(--gutter)}
.grid-12{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(12px,2vw,24px);
}
@media (min-width:768px){.grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}}
@media (min-width:1024px){.grid-12{grid-template-columns:repeat(12,minmax(0,1fr))}}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid var(--line-strong);
  background:transparent;
  color:var(--sand);
  font-family:var(--font-display);
  font-size:.9rem;
  font-weight:500;
  letter-spacing:.09em;
  line-height:1.4;
  transition:background-color .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease);
}
.btn:hover,.btn:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:var(--ink-900)}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--amber);border-color:var(--amber);color:var(--ink-900)}
.btn--ghost{border-color:var(--line);color:var(--haze)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--sand);color:var(--sand)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:4px 10px;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.08em;
  color:var(--haze);
}
.breadcrumb li{display:flex;align-items:baseline;gap:10px}
.breadcrumb li+li::before{content:"/";color:var(--line-strong)}
.breadcrumb a{color:var(--haze);transition:color .14s var(--ease)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--sand)}

/* ---------- 标签与图例 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";flex:none;width:18px;height:1px;background:currentColor}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  line-height:1.6;
  color:var(--haze);
}
.tag--live{color:var(--cyan);border-color:rgba(47,227,208,.45);background:rgba(47,227,208,.07)}
.tag--amber{color:var(--amber);border-color:rgba(242,184,75,.45);background:rgba(242,184,75,.07)}
.tag--ember{color:var(--ember);border-color:rgba(232,101,79,.45);background:rgba(232,101,79,.07)}

/* ---------- 面板 ---------- */
.panel{
  position:relative;
  background:var(--ink-800);
  border:1px solid var(--line);
  padding:clamp(16px,2.2vw,26px);
}
.panel--sand{
  background:var(--sand);
  color:var(--ink-900);
  border-color:rgba(7,26,43,.18);
}
.panel--sand .tag{border-color:rgba(7,26,43,.24);color:#3A5A72}
.panel--sand .eyebrow{color:#0F6B63}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  width:100%;
  background:var(--ink-700);
  border:1px solid var(--line);
}
.media-frame>img,
.media-frame>svg{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.85) contrast(1.05);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(to right,rgba(7,26,43,.22) 1px,transparent 1px),
                   linear-gradient(to bottom,rgba(7,26,43,.22) 1px,transparent 1px);
  background-size:40px 40px;
  opacity:.55;
}
.media-frame--4x3{aspect-ratio:4 / 3}
.media-frame--16x9{aspect-ratio:16 / 9}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-frame--32x9{aspect-ratio:32 / 9}
@media (max-width:640px){.media-frame--4x3,.media-frame--16x9{aspect-ratio:3 / 2}}
.media-caption{
  margin-block-start:8px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--haze);
}

/* ---------- 进入视口显现 ---------- */
.reveal-init{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.reveal-init.is-revealed{opacity:1;transform:none}

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