/* ==========================================================================
   球友汇服务 — 共享站点样式 /assets/site.css
   视觉母题：被重新划线的社区球场（细白标线 / 记分牌数字 / 排期方格）
   ========================================================================== */

/* ---------- reset ---------- */
*,
*::before,
*::after{box-sizing:border-box}

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

body,
h1,h2,h3,h4,h5,h6,
p,figure,blockquote,dl,dd,pre{
  margin:0;
}

ul,ol{margin:0;padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
input,select,textarea{font:inherit}
hr{border:0;margin:0}

/* ---------- 设计变量 ---------- */
:root{
  /* 色彩 */
  --ink-900:#0C1A22;
  --ink-700:#172C38;
  --court-600:#2C6B4E;
  --court-500:#347C5B;
  --court-300:#7FA98F;
  --clay-500:#C85E2C;
  --clay-700:#8E3D18;
  --clay-200:#E8A87C;
  --volt-400:#C6F04B;
  --volt-500:#D7FF63;
  --rock-500:#7C837C;
  --paper-50:#F5F2E9;
  --paper-200:#E7E2D4;
  --line-300:#CFC9B8;
  --text-900:#14201C;

  /* 字体 */
  --font-display:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  /* 尺寸与节奏 */
  --header-h:92px;
  --shell-max:1360px;
  --measure:68ch;
  --shadow-1:0 1px 0 rgba(12,26,34,.08);
  --shadow-2:0 8px 24px rgba(12,26,34,.14);
  --ease:cubic-bezier(.4,0,.2,1);
}

@media (max-width:1000px){
  :root{--header-h:72px}
}

/* ---------- 中文基础排版 ---------- */
body{
  background:var(--paper-50);
  color:var(--text-900);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

::selection{background:var(--volt-400);color:var(--ink-900)}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.18;
  color:var(--text-900);
}

p{line-height:1.85}

/* ---------- 无障碍 ---------- */
:focus-visible{
  outline:2px solid var(--clay-500);
  outline-offset:3px;
  border-radius:2px;
}

.site-footer :focus-visible,
.site-header :focus-visible{
  outline-color:var(--volt-400);
}

.skip-link{
  position:fixed;
  top:-140px;
  left:16px;
  z-index:300;
  display:inline-block;
  padding:12px 20px;
  background:var(--volt-400);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  border-radius:2px;
  box-shadow:var(--shadow-2);
  transition:top .2s var(--ease);
}

.skip-link:focus{
  top:16px;
  outline:2px solid var(--ink-900);
  outline-offset:2px;
}

/* ---------- 布局容器 ---------- */
.container{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:32px;
}

.site-main{
  display:block;
  padding-top:var(--header-h);
}

body[data-hero] .site-main{
  padding-top:0;
}

.section{padding-block:clamp(56px,7vw,104px)}
.section--tight{padding-block:clamp(36px,4.5vw,60px)}

/* ---------- 网格 ---------- */
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:36px 32px;
}

.col-8{grid-column:span 8}
.col-6{grid-column:span 6}
.col-4{grid-column:span 4}
.col-full{grid-column:1 / -1}

@media (max-width:900px){
  .grid-12{
    grid-template-columns:minmax(0,1fr);
    gap:28px;
  }
  .col-8,
  .col-6,
  .col-4,
  .col-full{grid-column:1 / -1}
}

@media (max-width:640px){
  .container{padding-inline:20px}
}

/* ---------- 标题与文本层级 ---------- */
.display{
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.1;
  color:var(--text-900);
}

.display-xl{font-size:clamp(40px,6vw,76px);line-height:1.03}
.display-lg{font-size:clamp(34px,4.6vw,52px);line-height:1.08}
.display-md{font-size:clamp(26px,3vw,34px);line-height:1.15}
.display-sm{font-size:clamp(20px,2.1vw,24px);line-height:1.3}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.6;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--court-600);
}

.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:currentColor;
  flex:0 0 auto;
}

.lede{
  font-size:clamp(17px,1.55vw,20px);
  line-height:1.8;
  color:var(--ink-700);
  max-width:60ch;
}

.prose{max-width:var(--measure)}
.prose p + p{margin-top:.9em}
.prose h2{margin-top:1.6em;margin-bottom:.5em;font-size:clamp(24px,2.4vw,30px)}
.prose h3{margin-top:1.4em;margin-bottom:.4em;font-size:clamp(19px,1.9vw,22px);font-weight:700}
.prose ul,
.prose ol{margin-top:.9em;padding-left:1.4em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{line-height:1.85}
.prose li + li{margin-top:.35em}
.prose a{color:var(--court-600);border-bottom:1px solid var(--line-300);transition:border-color .18s var(--ease),color .18s var(--ease)}
.prose a:hover{border-bottom-color:var(--court-600)}

.rule{
  height:1px;
  width:100%;
  background:var(--line-300);
}
.rule--dark{background:rgba(245,242,233,.16)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 24px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.01em;
  text-align:center;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}

.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}

.btn--volt{background:var(--volt-400);color:var(--ink-900)}
.btn--volt:hover{background:var(--volt-500)}

.btn--court{background:var(--court-600);color:var(--paper-50)}
.btn--court:hover{background:var(--court-500)}

.btn--clay{background:var(--clay-500);color:#FFF8F2}
.btn--clay:hover{background:var(--clay-700)}

.btn--line{border-color:var(--line-300);color:var(--text-900);background:transparent}
.btn--line:hover{border-color:var(--court-600);color:var(--court-600)}

.btn--line-light{border-color:rgba(245,242,233,.32);color:var(--paper-50);background:transparent}
.btn--line-light:hover{border-color:var(--volt-400);color:var(--volt-400)}

.btn--sm{padding:9px 16px;font-size:13px}
.btn--block{width:100%}

/* ---------- 标签、筛选、面包屑 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 13px;
  border:1px solid var(--line-300);
  border-radius:999px;
  background:transparent;
  color:var(--text-900);
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.5;
  letter-spacing:.04em;
  cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease);
}

.chip:hover{border-color:var(--court-600);color:var(--court-600)}

.chip[aria-pressed="true"]{
  background:var(--ink-900);
  border-color:var(--ink-900);
  color:var(--volt-400);
}

.tag{
  display:inline-block;
  padding:3px 8px;
  border-radius:2px;
  background:var(--paper-200);
  color:var(--clay-700);
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.6;
  letter-spacing:.06em;
}

.tag--court{background:rgba(44,107,78,.13);color:var(--court-600)}
.tag--volt{background:var(--volt-400);color:var(--ink-900)}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.6;
  letter-spacing:.04em;
  color:rgba(23,44,56,.7);
}

.breadcrumb a{
  color:rgba(23,44,56,.7);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}

.breadcrumb a:hover{color:var(--court-600);border-bottom-color:currentColor}
.breadcrumb [aria-current="page"]{color:var(--text-900)}
.breadcrumb-sep{color:var(--line-300)}

/* ---------- 编辑部索引目录 ---------- */
.index-list{
  border-top:1px solid var(--line-300);
  margin-top:8px;
}

.index-row{
  display:grid;
  grid-template-columns:58px minmax(0,1fr) auto;
  align-items:baseline;
  gap:2px 20px;
  padding:20px 6px;
  border-bottom:1px solid var(--line-300);
  transition:background-color .18s var(--ease);
}

.index-row:hover{background:rgba(44,107,78,.05)}

.index-num{
  font-family:var(--font-mono);
  font-size:14px;
  line-height:1.7;
  letter-spacing:.06em;
  color:rgba(23,44,56,.76);
  transition:color .18s var(--ease);
}

.index-row:hover .index-num{color:var(--clay-500)}

.index-title{
  position:relative;
  display:inline-block;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:700;
  line-height:1.45;
  letter-spacing:-.01em;
  color:var(--text-900);
}

.index-title::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-3px;
  width:0;
  height:2px;
  background:var(--court-600);
  transition:width .24s var(--ease);
}

.index-row:hover .index-title::after{width:100%}

.index-desc{
  grid-column:2 / 3;
  margin-top:4px;
  font-size:15px;
  line-height:1.75;
  color:rgba(23,44,56,.75);
}

.index-meta{
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.7;
  letter-spacing:.05em;
  color:rgba(23,44,56,.76);
  white-space:nowrap;
}

@media (max-width:640px){
  .index-row{grid-template-columns:44px minmax(0,1fr);gap:2px 14px;padding:16px 2px}
  .index-meta{grid-column:2 / 3}
}

/* ---------- 可追溯记录条 ---------- */
.record-strip{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  padding:14px 18px;
  background:var(--ink-900);
  border-left:3px solid var(--volt-400);
  color:var(--paper-50);
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.7;
  letter-spacing:.04em;
}

.record-id{color:var(--volt-400)}

.record-fields{
  display:flex;
  flex-wrap:wrap;
  gap:6px 20px;
  color:rgba(245,242,233,.76);
}

.record-state{
  margin-left:auto;
  padding:3px 10px;
  border-radius:2px;
  background:var(--court-600);
  color:var(--paper-50);
  font-size:12px;
  letter-spacing:.06em;
}

@media (max-width:640px){
  .record-state{margin-left:0}
}

/* ---------- 旁注与卡片 ---------- */
.sidenote{
  padding-left:16px;
  border-left:2px solid var(--line-300);
  font-size:13.5px;
  line-height:1.8;
  color:rgba(23,44,56,.78);
}

.sidenote strong{
  display:block;
  margin-bottom:4px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.12em;
  color:var(--court-600);
}

.card{
  background:#FCFAF4;
  border:1px solid var(--line-300);
  box-shadow:var(--shadow-1);
  padding:26px;
}

.card--ink{
  background:var(--ink-900);
  border-color:rgba(245,242,233,.14);
  color:var(--paper-50);
  box-shadow:none;
}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  width:100%;
  aspect-ratio:16 / 9;
  background:var(--paper-200);
  border:1px solid var(--line-300);
}

.media-frame img{
  position:relative;
  z-index:0;
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  box-shadow:inset 0 0 0 1px rgba(12,26,34,.08);
  pointer-events:none;
}

.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}

.media-frame--overlay::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(180deg,rgba(12,26,34,.12) 0%,rgba(12,26,34,.74) 100%);
}

@media (max-width:640px){
  .media-frame--tall{aspect-ratio:3 / 4}
}

/* ==========================================================================
   页头
   ========================================================================== */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:100;
  background:var(--ink-900);
  color:var(--paper-50);
  border-bottom:1px solid rgba(245,242,233,.14);
  transition:background-color .24s var(--ease),
             border-color .24s var(--ease),
             box-shadow .24s var(--ease);
}

body[data-hero] .site-header{
  background:transparent;
  border-bottom-color:transparent;
  box-shadow:none;
}

body[data-hero] .site-header.is-scrolled{
  background:var(--ink-900);
  border-bottom-color:rgba(245,242,233,.14);
  box-shadow:0 8px 24px rgba(12,26,34,.32);
}

.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:26px;
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding:0 32px;
  min-height:var(--header-h);
  transition:min-height .24s var(--ease);
}

.site-header.is-scrolled .header-inner{min-height:64px}

/* 品牌 */
.brand{
  display:flex;
  flex:0 0 auto;
  flex-direction:column;
  gap:3px;
  padding:4px 0;
}

.brand-mark{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
  color:var(--paper-50);
}

.brand-mark::before{
  content:"";
  flex:0 0 auto;
  width:10px;
  height:10px;
  background:var(--volt-400);
  box-shadow:0 0 0 3px rgba(198,240,75,.18);
}

.brand-tagline{
  padding-left:20px;
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.4;
  letter-spacing:.08em;
  color:var(--court-300);
}

/* 主导航 */
.site-nav{
  flex:1 1 auto;
  min-width:0;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}

.nav-list a{
  position:relative;
  display:block;
  padding:10px 12px;
  font-family:var(--font-display);
  font-size:14.5px;
  font-weight:500;
  line-height:1.5;
  letter-spacing:.01em;
  color:rgba(245,242,233,.76);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}

.nav-list a:hover{
  color:var(--paper-50);
  background:rgba(245,242,233,.07);
}

.nav-list a[aria-current="page"]{color:var(--paper-50)}

.nav-list a[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:4px;
  height:2px;
  background:var(--volt-400);
}

.nav-item--mobile-cta{display:none}

/* 右侧操作区 */
.header-actions{
  display:flex;
  flex:0 0 auto;
  align-items:center;
  gap:12px;
  margin-left:auto;
}

.header-cta{
  padding:11px 20px;
  font-size:14px;
  white-space:nowrap;
}

/* 移动端开关 */
.nav-toggle{
  position:relative;
  display:none;
  width:44px;
  height:44px;
  padding:0;
  border:1px solid rgba(245,242,233,.28);
  border-radius:2px;
  background:transparent;
  cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}

.nav-toggle:hover{
  border-color:rgba(198,240,75,.6);
  background:rgba(245,242,233,.06);
}

.nav-toggle-bar{
  position:absolute;
  left:11px;
  width:22px;
  height:2px;
  background:var(--paper-50);
  transition:transform .2s var(--ease),opacity .2s var(--ease),top .2s var(--ease);
}

.nav-toggle-bar:nth-child(1){top:14px}
.nav-toggle-bar:nth-child(2){top:21px}
.nav-toggle-bar:nth-child(3){top:28px}

.site-header[data-open] .nav-toggle-bar:nth-child(1){top:21px;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bar:nth-child(3){top:21px;transform:rotate(-45deg)}

/* 滚动进度条 */
.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:0;
  height:2px;
  background:var(--volt-400);
  opacity:0;
  pointer-events:none;
  transition:opacity .24s var(--ease);
}

.site-header.is-scrolled .scroll-progress{opacity:1}

/* 移动端布局 */
@media (max-width:1000px){
  .nav-toggle{display:flex}

  .header-cta{display:none}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    padding:8px 20px 26px;
    background:var(--ink-900);
    border-bottom:1px solid rgba(245,242,233,.14);
    box-shadow:0 16px 32px rgba(12,26,34,.4);
    max-height:calc(100vh - 72px);
    overflow-y:auto;
  }

  .site-header[data-open] .site-nav{display:block}

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }

  .nav-list a{
    padding:15px 4px;
    font-size:16.5px;
    color:rgba(245,242,233,.86);
    border-bottom:1px solid rgba(245,242,233,.1);
  }

  .nav-list a[aria-current="page"]{color:var(--volt-400)}

  .nav-list a[aria-current="page"]::after{
    left:4px;
    right:auto;
    bottom:2px;
    width:32px;
  }

  .nav-item--mobile-cta{
    display:block;
    padding:18px 0 0;
  }

  .nav-item--mobile-cta a{
    padding:14px 20px;
    border-bottom:0;
    color:var(--ink-900);
    font-size:15px;
    text-align:center;
  }

  .nav-item--mobile-cta a:hover{
    background:var(--volt-500);
    color:var(--ink-900);
  }
}

@media (max-width:1000px){
  .header-inner{padding:0 20px;gap:16px}
  .site-header.is-scrolled .header-inner{min-height:60px}
}

@media (max-width:600px){
  .brand-mark{font-size:17px}
  .brand-tagline{font-size:10.5px;letter-spacing:.06em}
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--ink-900);
  color:rgba(245,242,233,.72);
  font-size:15px;
  line-height:1.8;
}

.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(245,242,233,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(245,242,233,.055) 1px,transparent 1px);
  background-size:72px 72px;
  opacity:.7;
  -webkit-mask-image:linear-gradient(to bottom,#000 0%,rgba(0,0,0,.15) 72%,transparent 100%);
  mask-image:linear-gradient(to bottom,#000 0%,rgba(0,0,0,.15) 72%,transparent 100%);
}

.site-footer::after{
  content:"";
  position:absolute;
  top:0;
  left:0;
  width:min(260px,42%);
  height:3px;
  background:var(--volt-400);
}

.footer-inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,2.15fr) minmax(0,1.15fr);
  gap:48px;
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding:76px 32px 56px;
}

/* 页脚品牌 */
.footer-brand-mark{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-display);
  font-size:24px;
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.02em;
  color:var(--paper-50);
}

.footer-brand-mark::before{
  content:"";
  flex:0 0 auto;
  width:12px;
  height:12px;
  background:var(--volt-400);
}

.footer-summary{
  margin-top:16px;
  max-width:34ch;
  font-size:14.5px;
  line-height:1.8;
  color:rgba(245,242,233,.62);
}

.footer-cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:22px;
  padding-bottom:4px;
  border-bottom:1px solid rgba(198,240,75,.36);
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.6;
  letter-spacing:.08em;
  color:var(--volt-400);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}

.footer-cta::after{
  content:"→";
  font-size:14px;
  line-height:1;
}

.footer-cta:hover{
  color:var(--volt-500);
  border-bottom-color:var(--volt-400);
}

/* 页脚栏目 */
.footer-nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:32px 24px;
}

.footer-col-title{
  margin:0 0 18px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  line-height:1.6;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--court-300);
}

.footer-links{display:grid;gap:11px}

.footer-links a{
  display:inline-block;
  padding:2px 0;
  border-bottom:1px solid transparent;
  font-size:15px;
  line-height:1.6;
  color:rgba(245,242,233,.78);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}

.footer-links a:hover{
  color:var(--paper-50);
  border-bottom-color:var(--volt-400);
}

/* 页脚联系区 */
.footer-contact-list{display:grid;gap:15px}

.footer-contact-item{display:grid;gap:3px}

.footer-contact-label{
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.6;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--court-300);
}

.footer-contact-value{
  font-size:14px;
  line-height:1.7;
  color:rgba(245,242,233,.84);
  word-break:break-word;
}

.footer-note{
  margin-top:22px;
  padding-top:16px;
  border-top:1px solid rgba(245,242,233,.13);
  font-size:12.5px;
  line-height:1.75;
  color:rgba(245,242,233,.55);
}

.footer-note a{
  color:var(--court-300);
  border-bottom:1px solid rgba(127,169,143,.45);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}

.footer-note a:hover{
  color:var(--volt-400);
  border-bottom-color:var(--volt-400);
}

/* 页脚底栏 */
.footer-bottom{
  position:relative;
  z-index:1;
  border-top:1px solid rgba(245,242,233,.14);
  background:rgba(12,26,34,.6);
}

.footer-bottom-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 26px;
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding:20px 32px;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.7;
  letter-spacing:.05em;
}

.footer-copyright{color:rgba(245,242,233,.68)}
.footer-icp{color:rgba(245,242,233,.5)}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 20px;
  margin-left:auto;
}

.footer-legal a{
  color:rgba(245,242,233,.68);
  transition:color .18s var(--ease);
}

.footer-legal a:hover{color:var(--volt-400)}

/* 返回顶部 */
.back-to-top{
  position:fixed;
  right:24px;
  bottom:24px;
  z-index:90;
  display:flex;
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  padding:0;
  border-radius:50%;
  background:var(--ink-900);
  border:1px solid rgba(245,242,233,.22);
  color:var(--volt-400);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  box-shadow:var(--shadow-2);
  transition:opacity .24s var(--ease),transform .24s var(--ease),
             visibility .24s var(--ease),border-color .18s var(--ease);
}

.back-to-top.is-visible{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

.back-to-top:hover{border-color:var(--volt-400)}

.back-to-top-icon{
  display:block;
  font-family:var(--font-mono);
  font-size:20px;
  line-height:1;
}

@media (max-width:1080px){
  .footer-inner{
    grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);
    gap:40px 48px;
  }
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:760px){
  .footer-inner{
    grid-template-columns:minmax(0,1fr);
    gap:36px;
    padding:56px 20px 40px;
  }
  .footer-contact{grid-column:auto}
  .footer-summary{max-width:none}
  .footer-bottom-inner{padding:20px;gap:8px 16px}
  .footer-legal{margin-left:0;width:100%}
  .back-to-top{right:16px;bottom:16px;width:44px;height:44px}
}

@media (max-width:560px){
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ==========================================================================
   显现动效（渐进增强，未启用 JS 时内容完整可见）
   ========================================================================== */
.has-reveal [data-reveal]{
  opacity:0;
  transform:translateX(-14px);
  transition:opacity .4s var(--ease),transform .4s var(--ease);
}

.has-reveal [data-reveal].is-revealed{
  opacity:1;
  transform:translateX(0);
}

/* ==========================================================================
   减弱动效偏好
   ========================================================================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}

  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }

  .has-reveal [data-reveal]{
    opacity:1;
    transform:none;
  }

  .btn:hover,
  .back-to-top{transform:none}
}