/* ============ 上下分电玩 · 共享站点样式 /assets/site.css ============ */

:root{
  --void:#0B0A12;
  --panel:#171329;
  --edge:#4A3F73;
  --neon:#A855F7;
  --volt:#2FD2FF;
  --mint:#35E0A1;
  --amber:#FF8A3D;
  --gold:#FFCF5C;
  --haze:#A79FC7;
  --ink:#F4F1FF;
  --ink-soft:#D8D2EE;
  --rail-w:15rem;
  --header-h:8rem;
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow-hard:6px 6px 0 0 rgba(74,63,115,.92);
  --font-display:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","DM Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box;}

html{
  background:var(--void);
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 1rem);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  min-height:100%;
  background:transparent;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(168,85,247,.05) 0 1px,transparent 1px 4px),
    repeating-linear-gradient(90deg,rgba(47,210,255,.045) 0 1px,transparent 1px 64px),
    repeating-linear-gradient(0deg,rgba(47,210,255,.045) 0 1px,transparent 1px 64px),
    radial-gradient(1100px 620px at 80% -12%,rgba(168,85,247,.24),transparent 62%),
    radial-gradient(900px 520px at 4% 104%,rgba(47,210,255,.16),transparent 60%);
}

img,svg,video{max-width:100%;height:auto;}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;line-height:1.14;letter-spacing:-.01em;margin:0 0 .6rem;}
p{margin:0 0 1rem;overflow-wrap:break-word;}
ul,ol{margin:0 0 1rem;padding-left:1.1rem;}
a{color:var(--volt);text-decoration:none;}
a:hover{color:var(--ink);}
::selection{background:var(--neon);color:#0B0A12;}
:focus-visible{outline:2px solid var(--mint);outline-offset:2px;}

.arc-visually-hidden{
  position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

.arc-skip{
  position:absolute;left:-9999px;top:0;z-index:120;
  background:var(--mint);color:#04140D;font-weight:900;
  padding:.6rem 1rem;border:2px solid #04140D;border-radius:2px;
}
.arc-skip:focus{left:.6rem;top:.6rem;}

/* ============ 头部：品牌轨道 + 双层导航 ============ */
.arc-header{
  position:sticky;
  top:0;
  z-index:60;
  display:grid;
  grid-template-columns:var(--rail-w) minmax(0,1fr);
  grid-template-rows:auto auto;
  background:linear-gradient(180deg,rgba(23,19,41,.97),rgba(11,10,18,.94));
  border-bottom:2px solid var(--edge);
  backdrop-filter:blur(6px);
}

.arc-brandbar{
  grid-column:1;
  grid-row:1 / span 2;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  gap:.9rem;
  padding:1rem 1.05rem;
  border-right:2px solid var(--edge);
  background:linear-gradient(200deg,rgba(168,85,247,.2),rgba(11,10,18,.1) 62%);
}

.arc-brand{display:flex;align-items:center;gap:.65rem;color:var(--ink);text-decoration:none;}
.arc-brand__mark{
  flex:none;display:grid;place-items:center;
  width:2.6rem;height:2.6rem;border-radius:2px;
  font-family:var(--font-display);font-weight:900;font-size:.8rem;line-height:1;letter-spacing:0;
  color:#0B0A12;background:linear-gradient(140deg,var(--neon),var(--volt));
  border:2px solid var(--ink);
  box-shadow:3px 3px 0 0 rgba(255,138,61,.85);
}
.arc-brand__text{display:block;min-width:0;}
.arc-brand__name{
  display:block;font-family:var(--font-display);font-weight:900;
  font-size:1.05rem;letter-spacing:.01em;transition:color .16s var(--ease);
}
.arc-brand__tag{
  display:block;font-size:.74rem;letter-spacing:.06em;color:var(--haze);
  margin-top:.1rem;
}
.arc-brand:hover .arc-brand__name{color:var(--volt);}

.arc-brandbar__note{
  margin:0;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;
  color:var(--haze);border-left:4px solid var(--neon);padding-left:.5rem;
}

.arc-strip{
  grid-column:2;
  grid-row:1;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.6rem 1rem;
  padding:.55rem clamp(.9rem,3vw,1.6rem);
  background:linear-gradient(90deg,rgba(168,85,247,.18),rgba(47,210,255,.12) 70%,transparent);
  border-bottom:2px solid var(--edge);
}
.arc-strip__text{
  margin:0;font-size:.84rem;line-height:1.5;color:var(--ink-soft);
  letter-spacing:.01em;
}
.arc-strip__acts{display:flex;flex-wrap:wrap;gap:.45rem;}

.arc-navzone{grid-column:2;grid-row:2;display:flex;flex-direction:column;min-width:0;}

.arc-nav{display:block;border-top:2px solid var(--edge);}
.arc-nav__list{display:flex;flex-wrap:wrap;list-style:none;margin:0;padding:0;}
.arc-nav__list li{display:flex;}
.arc-nav__list a{
  position:relative;display:block;
  padding:.7rem clamp(.7rem,1.6vw,1.05rem);
  border-right:2px solid var(--edge);
  color:var(--haze);font-weight:800;font-size:.94rem;letter-spacing:.02em;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.arc-nav__list a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:3px;
  background:var(--volt);
  transition:right .18s var(--ease);
}
.arc-nav__list a:hover,
.arc-nav__list a:focus-visible{color:var(--ink);background:rgba(47,210,255,.09);}
.arc-nav__list a:hover::after,
.arc-nav__list a:focus-visible::after{right:0;}
.arc-nav__list a[aria-current="page"]{
  background:var(--neon);color:#0B0A12;
  box-shadow:inset 0 -4px 0 0 var(--amber);
}
.arc-nav__list a[aria-current="page"]::after{right:100%;}

.arc-navtoggle{
  display:none;align-items:center;gap:.6rem;
  margin:.6rem clamp(.9rem,3vw,1.6rem) 0;
  padding:.5rem .85rem;border:2px solid var(--neon);border-radius:2px;
  background:transparent;color:var(--ink);
  font-family:inherit;font-weight:800;font-size:.9rem;letter-spacing:.06em;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease),box-shadow .16s var(--ease);
}
.arc-navtoggle:hover{border-color:var(--volt);color:var(--volt);box-shadow:4px 4px 0 0 rgba(47,210,255,.35);}
.arc-navtoggle__bars{
  position:relative;display:block;width:20px;height:2px;background:currentColor;
}
.arc-navtoggle__bars::before,
.arc-navtoggle__bars::after{
  content:"";position:absolute;left:0;width:20px;height:2px;background:currentColor;
}
.arc-navtoggle__bars::before{top:-6px;}
.arc-navtoggle__bars::after{top:6px;}
.arc-navtoggle[aria-expanded="true"]{border-color:var(--amber);color:var(--amber);}

/* ============ 页面骨架：左轨道 + 右内容 ============ */
.arc-shell{
  display:grid;
  grid-template-columns:var(--rail-w) minmax(0,1fr);
  align-items:start;
  max-width:1440px;
  margin-inline:auto;
}
.arc-aside{
  position:sticky;
  top:calc(var(--header-h) + 1rem);
  min-height:1px;
  padding:1.6rem 1rem 2.4rem;
  border-right:2px solid var(--edge);
}
.arc-body{
  min-width:0;
  padding:clamp(1.6rem,4vw,3rem) clamp(1rem,3.5vw,2.8rem) clamp(3rem,6vw,5rem);
}

/* ============ 侧边索引 ============ */
.arc-rail__title{
  margin:0 0 .6rem;font-family:var(--font-mono);font-size:.72rem;
  letter-spacing:.16em;text-transform:uppercase;color:var(--haze);
}
.arc-rail__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px;}
.arc-rail__link{
  display:block;padding:.5rem .6rem;
  border-left:4px solid transparent;
  color:var(--haze);font-weight:700;font-size:.87rem;
  transition:color .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease);
}
.arc-rail__link:hover{color:var(--ink);background:rgba(47,210,255,.09);border-left-color:var(--volt);}
.arc-rail__link[aria-current]{
  color:var(--ink);
  border-left-color:var(--neon);
  background:linear-gradient(90deg,rgba(168,85,247,.26),transparent);
}

/* ============ 标题与正文 ============ */
.arc-eyebrow{
  margin:0 0 .5rem;font-family:var(--font-mono);font-size:.74rem;
  letter-spacing:.2em;text-transform:uppercase;color:var(--volt);
}
.arc-h1{
  font-size:clamp(2rem,4.4vw,3.4rem);
  padding-left:.7rem;
  border-left:6px solid var(--neon);
  text-shadow:0 0 8px rgba(168,85,247,.5);
  margin-bottom:1rem;
}
.arc-h1--hot{border-left-color:var(--amber);text-shadow:0 0 8px rgba(255,138,61,.45);}
.arc-h2{font-size:clamp(1.35rem,2.4vw,1.9rem);padding-left:.6rem;border-left:6px solid var(--volt);margin-top:2rem;}
.arc-h3{font-size:1.1rem;color:var(--ink);margin-top:1.4rem;}
.arc-lead{font-size:1.05rem;color:var(--ink-soft);max-width:36em;}
.arc-prose{max-width:36em;}
.arc-prose p{margin-bottom:1.05rem;}
.arc-prose p:last-child{margin-bottom:0;}

.arc-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em;}
.arc-figure{
  display:inline-block;font-family:var(--font-mono);font-weight:700;
  font-size:clamp(2.6rem,6vw,5.5rem);line-height:1;color:var(--amber);
  transition:transform .16s var(--ease),text-shadow .16s var(--ease);
}
.arc-figure:hover{transform:scale(1.02);text-shadow:0 0 8px rgba(255,138,61,.55);}
.arc-figure__unit{
  font-size:.28em;color:var(--haze);vertical-align:super;margin-left:.25em;
  font-weight:500;letter-spacing:.05em;
}

/* ============ 网格 ============ */
.arc-grid{display:grid;gap:clamp(1rem,2.5vw,1.8rem);}
.arc-grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));}
.arc-grid--split{grid-template-columns:minmax(0,1.62fr) minmax(0,1fr);align-items:start;}

/* ============ 卡片 ============ */
.arc-card{
  border:2px solid var(--edge);
  border-radius:2px;
  background:var(--panel);
  box-shadow:var(--shadow-hard);
  padding:1.15rem 1.25rem;
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease),transform .16s var(--ease);
}
.arc-card:hover{
  border-color:var(--neon);
  transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 0 rgba(168,85,247,.5);
}
.arc-card__title{margin:0 0 .4rem;font-size:1.05rem;font-family:var(--font-display);font-weight:900;}
.arc-card__meta{
  margin:0 0 .6rem;font-family:var(--font-mono);font-size:.72rem;
  letter-spacing:.1em;color:var(--haze);
}
.arc-card__body{margin:0;font-size:.95rem;color:var(--ink-soft);}
.arc-card--hot{border-color:var(--amber);}
.arc-card--hot:hover{border-color:var(--gold);box-shadow:8px 8px 0 0 rgba(255,138,61,.5);}

.arc-tag{
  display:inline-block;padding:.1rem .45rem;border:2px solid var(--edge);border-radius:2px;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;color:var(--haze);
}
.arc-tag--hot{border-color:var(--amber);color:var(--amber);}
.arc-tag--mint{border-color:var(--mint);color:var(--mint);}
.arc-tag--volt{border-color:var(--volt);color:var(--volt);}

/* ============ 按钮 ============ */
.arc-btn{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.42rem .85rem;border:2px solid var(--edge);border-radius:2px;
  background:var(--panel);color:var(--ink);
  font-family:inherit;font-weight:800;font-size:.85rem;letter-spacing:.03em;
  text-decoration:none;cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease),
             box-shadow .16s var(--ease),transform .16s var(--ease),background-color .16s var(--ease);
}
.arc-btn:hover{
  border-color:var(--neon);color:var(--ink);transform:translate(-2px,-2px);
  box-shadow:4px 4px 0 0 rgba(168,85,247,.45);
}
.arc-btn--ghost{background:transparent;border-color:var(--volt);color:var(--volt);}
.arc-btn--ghost:hover{background:rgba(47,210,255,.12);border-color:var(--volt);color:var(--ink);box-shadow:4px 4px 0 0 rgba(47,210,255,.4);}
.arc-btn--hot{background:var(--amber);border-color:var(--amber);color:#180C03;}
.arc-btn--hot:hover{background:var(--gold);border-color:var(--gold);color:#180C03;box-shadow:4px 4px 0 0 rgba(255,138,61,.55);}

/* ============ 面包屑 ============ */
.arc-crumb{
  margin-bottom:1.2rem;font-family:var(--font-mono);font-size:.78rem;color:var(--haze);
}
.arc-crumb ol{display:flex;flex-wrap:wrap;gap:.4rem;list-style:none;margin:0;padding:0;}
.arc-crumb li{display:flex;align-items:center;}
.arc-crumb li + li::before{content:"›";margin-right:.4rem;color:var(--neon);}
.arc-crumb a{color:var(--haze);border-bottom:2px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease);}
.arc-crumb a:hover{color:var(--volt);border-bottom-color:var(--volt);}

/* ============ 表格对照 ============ */
.arc-table{width:100%;border-collapse:collapse;font-size:.92rem;}
.arc-table caption{
  text-align:left;padding:.4rem 0 1rem;font-family:var(--font-mono);
  font-size:.74rem;letter-spacing:.14em;color:var(--haze);
}
.arc-table th,.arc-table td{border-bottom:2px solid var(--edge);padding:.6rem .7rem;text-align:left;vertical-align:top;}
.arc-table thead th{
  background:rgba(168,85,247,.12);color:var(--neon);
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.1em;font-weight:700;
}
.arc-table td.arc-num,.arc-table th.arc-num{text-align:right;}
.arc-table .arc-col-hot{background:rgba(255,207,92,.14);color:var(--gold);font-family:var(--font-mono);}
.arc-table tbody tr:hover td{background:rgba(47,210,255,.07);}

/* ============ 折叠面板 ============ */
.arc-panel{
  border:2px solid var(--edge);border-radius:2px;background:var(--panel);
  margin-bottom:.7rem;box-shadow:var(--shadow-hard);
}
.arc-panel > summary{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.8rem 1rem;cursor:pointer;font-weight:800;list-style:none;
  transition:background-color .16s var(--ease),color .16s var(--ease);
}
.arc-panel > summary::-webkit-details-marker{display:none;}
.arc-panel > summary:hover{background:rgba(47,210,255,.09);color:var(--volt);}
.arc-panel[open] > summary{background:rgba(168,85,247,.14);border-bottom:2px solid var(--edge);}
.arc-panel__arrow{
  flex:none;width:.6rem;height:.6rem;
  border-right:2px solid var(--volt);border-bottom:2px solid var(--volt);
  transform:rotate(-45deg);
  transition:transform .18s var(--ease),border-color .16s var(--ease);
}
.arc-panel[open] .arc-panel__arrow{transform:rotate(45deg);border-color:var(--amber);}
.arc-panel__body{padding:.9rem 1rem 1.1rem;font-size:.95rem;color:var(--ink-soft);}
.arc-panel__body p:last-child{margin-bottom:0;}

/* ============ 纯 CSS 标签页 ============ */
.arc-tabs{
  position:relative;border:2px solid var(--edge);border-radius:2px;
  background:var(--panel);box-shadow:var(--shadow-hard);
}
.arc-tabs__radio{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none;}
.arc-tabs__bar{display:flex;flex-wrap:wrap;border-bottom:2px solid var(--edge);}
.arc-tabs__btn{
  padding:.6rem 1rem;border-right:2px solid var(--edge);
  font-weight:800;font-size:.88rem;color:var(--haze);cursor:pointer;
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.arc-tabs__btn:hover{color:var(--ink);background:rgba(47,210,255,.09);}
.arc-tabs__panels{padding:1.1rem 1.2rem;}
.arc-tabs__panel{display:none;}
.arc-tabs__radio:nth-of-type(1):checked ~ .arc-tabs__bar .arc-tabs__btn:nth-child(1),
.arc-tabs__radio:nth-of-type(2):checked ~ .arc-tabs__bar .arc-tabs__btn:nth-child(2),
.arc-tabs__radio:nth-of-type(3):checked ~ .arc-tabs__bar .arc-tabs__btn:nth-child(3),
.arc-tabs__radio:nth-of-type(4):checked ~ .arc-tabs__bar .arc-tabs__btn:nth-child(4){
  color:#0B0A12;background:var(--volt);box-shadow:inset 0 -4px 0 0 var(--amber);
}
.arc-tabs__radio:nth-of-type(1):focus-visible ~ .arc-tabs__bar .arc-tabs__btn:nth-child(1),
.arc-tabs__radio:nth-of-type(2):focus-visible ~ .arc-tabs__bar .arc-tabs__btn:nth-child(2),
.arc-tabs__radio:nth-of-type(3):focus-visible ~ .arc-tabs__bar .arc-tabs__btn:nth-child(3),
.arc-tabs__radio:nth-of-type(4):focus-visible ~ .arc-tabs__bar .arc-tabs__btn:nth-child(4){
  outline:2px solid var(--mint);outline-offset:-2px;
}
.arc-tabs__radio:nth-of-type(1):checked ~ .arc-tabs__panels > .arc-tabs__panel:nth-child(1),
.arc-tabs__radio:nth-of-type(2):checked ~ .arc-tabs__panels > .arc-tabs__panel:nth-child(2),
.arc-tabs__radio:nth-of-type(3):checked ~ .arc-tabs__panels > .arc-tabs__panel:nth-child(3),
.arc-tabs__radio:nth-of-type(4):checked ~ .arc-tabs__panels > .arc-tabs__panel:nth-child(4){
  display:block;
}

/* ============ 图片容器（页面阶段放图） ============ */
.arc-media{
  position:relative;display:block;overflow:hidden;isolation:isolate;
  border:2px solid var(--edge);border-radius:2px;background:var(--panel);
  box-shadow:var(--shadow-hard);aspect-ratio:16/9;
  transition:border-color .16s var(--ease),box-shadow .16s var(--ease),transform .16s var(--ease);
}
.arc-media img{display:block;width:100%;height:100%;object-fit:cover;}
.arc-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(11,10,18,.3) 0 1px,transparent 1px 3px);
  opacity:.45;
}
.arc-media:hover{border-color:var(--neon);transform:translate(-2px,-2px);box-shadow:8px 8px 0 0 rgba(168,85,247,.5);}
.arc-media__tag{
  position:absolute;left:.6rem;top:.6rem;z-index:2;
  padding:.14rem .45rem;border:2px solid var(--neon);border-radius:2px;
  background:rgba(11,10,18,.86);color:var(--ink);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;
}
.arc-media--wide{aspect-ratio:21/9;}
.arc-media--tall{aspect-ratio:4/5;}
.arc-media--square{aspect-ratio:1/1;}
.arc-media--placeholder{
  background-image:linear-gradient(140deg,rgba(168,85,247,.3),rgba(47,210,255,.2) 55%,rgba(255,138,61,.24));
}
.arc-media--placeholder::before{
  content:"";position:absolute;inset:0;opacity:.55;
  background-image:
    linear-gradient(90deg,rgba(244,241,255,.16) 2px,transparent 2px),
    linear-gradient(0deg,rgba(244,241,255,.16) 2px,transparent 2px);
  background-size:36px 36px;
}

/* ============ 滚动进度与返回顶部 ============ */
.arc-progress{
  position:fixed;top:0;left:0;width:100%;height:3px;z-index:90;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--neon),var(--volt) 55%,var(--mint));
  opacity:.32;pointer-events:none;
  transition:opacity .16s var(--ease);
}
.arc-progress[data-on]{opacity:1;}

.arc-totop{
  position:fixed;right:1rem;bottom:1rem;z-index:70;
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.5rem .75rem;border:2px solid var(--volt);border-radius:2px;
  background:rgba(11,10,18,.94);color:var(--volt);
  font-family:inherit;font-weight:800;font-size:.8rem;letter-spacing:.04em;
  cursor:pointer;opacity:0;visibility:hidden;transform:translateY(6px);
  transition:opacity .18s var(--ease),transform .18s var(--ease),
             visibility .18s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.arc-totop[data-show]{opacity:1;visibility:visible;transform:none;}
.arc-totop:hover{color:var(--ink);border-color:var(--neon);}

/* ============ 页脚 ============ */
.arc-footer{
  border-top:2px solid var(--edge);
  background:linear-gradient(180deg,#110E20,var(--void));
}
.arc-footer__tape{
  display:flex;flex-wrap:wrap;gap:.45rem;
  width:min(1440px,100%);margin-inline:auto;
  padding:.6rem clamp(1rem,4vw,2.6rem);
  border-bottom:2px solid var(--edge);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
}
.arc-footer__tape span{border:2px solid var(--edge);border-radius:2px;padding:.12rem .5rem;color:var(--haze);}
.arc-footer__tape span:nth-child(1){border-color:var(--neon);color:var(--neon);}
.arc-footer__tape span:nth-child(2){border-color:var(--volt);color:var(--volt);}
.arc-footer__tape span:nth-child(3){border-color:var(--mint);color:var(--mint);}
.arc-footer__tape span:nth-child(4){border-color:var(--amber);color:var(--amber);}

.arc-footer__grid{
  display:grid;
  grid-template-columns:1.4fr repeat(3,minmax(0,1fr));
  gap:clamp(1.2rem,3vw,2.4rem);
  width:min(1440px,100%);margin-inline:auto;
  padding:clamp(1.6rem,4vw,2.8rem) clamp(1rem,4vw,2.6rem);
}
.arc-footer__brand{display:flex;flex-direction:column;gap:.9rem;}
.arc-brand--foot{padding:0;}
.arc-footer__blurb{margin:0;font-size:.9rem;color:var(--haze);max-width:30em;}

.arc-footer__col{min-width:0;}
.arc-footer__coltitle{
  margin:0 0 .7rem;padding-bottom:.4rem;
  border-bottom:2px solid var(--edge);
  font-family:var(--font-mono);font-size:.76rem;font-weight:700;
  letter-spacing:.12em;color:var(--neon);
}
.arc-footer__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.35rem;}
.arc-footer__list a{
  display:inline-block;color:var(--ink-soft);font-size:.9rem;
  border-bottom:2px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),padding-left .16s var(--ease);
}
.arc-footer__list a:hover{color:var(--volt);border-bottom-color:var(--volt);padding-left:.2rem;}

.arc-footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1.1rem;
  width:min(1440px,100%);margin-inline:auto;
  padding:1.1rem clamp(1rem,4vw,2.6rem) 2rem;
  border-top:2px solid var(--edge);
  font-size:.8rem;color:var(--haze);
}
.arc-footer__contact{width:100%;margin:0;font-family:var(--font-mono);font-size:.78rem;color:var(--ink-soft);}
.arc-footer__note{width:100%;margin:0;color:var(--haze);}
.arc-footer__legalinks{display:flex;flex-wrap:wrap;gap:.5rem 1rem;list-style:none;margin:0;padding:0;}
.arc-footer__legalinks a{
  color:var(--amber);border-bottom:2px solid var(--edge);
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.arc-footer__legalinks a:hover{color:var(--gold);border-bottom-color:var(--gold);}
.arc-footer__icp{margin:0 0 0 auto;font-family:var(--font-mono);}
.arc-footer__copy{margin:0;font-family:var(--font-mono);}

/* ============ 响应式 ============ */
@media (max-width:1200px){
  :root{--rail-w:12.5rem;}
  .arc-footer__grid{grid-template-columns:1fr repeat(3,minmax(0,1fr));}
}

@media (max-width:900px){
  .arc-header{grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto auto;}
  .arc-brandbar{
    grid-column:1;grid-row:1;
    flex-direction:row;align-items:center;justify-content:space-between;
    border-right:0;border-bottom:2px solid var(--edge);
    padding:.85rem 1rem;
  }
  .arc-brandbar__note{border-left-width:3px;text-align:right;}
  .arc-strip{grid-column:1;grid-row:2;}
  .arc-navzone{grid-column:1;grid-row:3;}
  .arc-navtoggle{display:inline-flex;}
  .arc-nav{display:none;border-top:0;padding:0 0 .9rem;}
  .arc-nav[data-open]{display:block;}
  .arc-nav__list{flex-direction:column;}
  .arc-nav__list li{display:block;border-top:2px solid var(--edge);}
  .arc-nav__list li:first-child{border-top:2px solid var(--edge);}
  .arc-nav__list a{border-right:0;padding:.75rem 1rem;font-size:.98rem;border-left:6px solid transparent;}
  .arc-nav__list a::after{display:none;}
  .arc-nav__list a:hover{border-left-color:var(--volt);}
  .arc-nav__list a[aria-current="page"]{border-left-color:var(--amber);box-shadow:none;}

  .arc-shell{grid-template-columns:minmax(0,1fr);}
  .arc-aside{position:static;border-right:0;border-bottom:2px solid var(--edge);padding:1.2rem 1rem;}
  .arc-rail__list{flex-direction:row;flex-wrap:wrap;}
  .arc-rail__link{border-left:0;border-bottom:4px solid transparent;}
  .arc-rail__link:hover,.arc-rail__link[aria-current]{border-left:0;border-bottom-color:var(--neon);background:rgba(168,85,247,.16);}
  .arc-body{padding:1.5rem 1.1rem 3.2rem;}

  .arc-grid--split{grid-template-columns:minmax(0,1fr);}
  .arc-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .arc-footer__brand{grid-column:1 / -1;}
  .arc-footer__icp{margin-left:0;}
}

@media (max-width:640px){
  body{font-size:16px;}
  .arc-strip{flex-direction:column;align-items:flex-start;}
  .arc-strip__acts{width:100%;}
  .arc-btn{flex:1 1 auto;justify-content:center;}
  .arc-media,.arc-media--wide{aspect-ratio:16/10;}
  .arc-footer__grid{grid-template-columns:minmax(0,1fr);}
  .arc-figure{font-size:clamp(2.2rem,11vw,3.4rem);}
  .arc-tabs__btn{border-bottom:2px solid var(--edge);}
}

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