/* =========================================================
   艾乐棋牌 · 共享样式 /assets/site.css
   1 变量  2 重置与排版  3 布局工具  4 按钮与状态
   5 页头  6 页脚  7 内容组件  8 响应式  9 动效
   ========================================================= */

/* ---------- 1 变量 ---------- */
:root{
  --ink-950:#04120F;
  --ink-900:#071C18;
  --ink-800:#0C2A24;
  --ink-700:#123A31;
  --gold:#D8A94A;
  --gold-soft:#F0C978;
  --cyan:#35E0D0;
  --coral:#FF6F4E;
  --paper:#F5F1E6;
  --text:#F2F5EF;
  --muted:#A9BDB4;
  --line:#2E5A4E;
  --ok:#7BD88F;

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --shell:1240px;
  --gutter:clamp(1.05rem,4vw,2.5rem);
  --radius-xl:26px;
  --radius-lg:18px;
  --radius-md:12px;
  --radius-pill:999px;
  --header-offset:6.9rem;
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow-lift:0 18px 40px -26px rgba(0,0,0,.9);
}

/* ---------- 2 重置与排版 ---------- */
*,*::before,*::after{box-sizing:border-box;}

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

body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:clamp(.95rem,.35vw + .86rem,1.05rem);
  line-height:1.85;
  color:var(--text);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 560px at 88% -8%,rgba(53,224,208,.10),transparent 68%),
    radial-gradient(900px 520px at 2% 108%,rgba(216,169,74,.10),transparent 68%),
    repeating-linear-gradient(45deg,rgba(242,245,239,.015) 0 2px,transparent 2px 8px);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6{
  margin:0 0 .55em;
  font-weight:800;
  line-height:1.16;
  letter-spacing:.045em;
  color:var(--text);
  text-wrap:balance;
}
h1{font-size:clamp(2.1rem,5vw,3.4rem);}
h2{font-size:clamp(1.55rem,3vw,2.3rem);}
h3{font-size:clamp(1.15rem,1.6vw,1.4rem);letter-spacing:.03em;}
h4{font-size:1.05rem;letter-spacing:.02em;}

p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}

a{color:var(--cyan);text-decoration:none;transition:color .2s var(--ease);}
a:hover{color:var(--gold-soft);}

img,svg{max-width:100%;}
img{display:block;height:auto;}

ul,ol{margin:0;padding:0;}
li{list-style:none;}

hr{border:0;height:1px;background:var(--line);margin:2rem 0;}

:focus-visible{outline:2px solid var(--gold-soft);outline-offset:3px;border-radius:4px;}

:target{scroll-margin-top:calc(var(--header-offset) + 1rem);}

::selection{background:rgba(216,169,74,.35);color:var(--text);}

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

/* ---------- 3 布局工具 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.split{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);
  gap:clamp(1.5rem,4vw,3rem);
  align-items:start;
}
.split--reverse{grid-template-columns:minmax(0,1fr) minmax(0,1.55fr);}

.rail{
  position:sticky;
  top:calc(var(--header-offset) + 1rem);
  display:grid;
  gap:1rem;
  align-self:start;
}

.grid{display:grid;gap:clamp(1rem,2.5vw,1.5rem);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));}

.prose{max-width:68ch;}
.prose p{color:var(--muted);margin:0 0 1.1em;}
.prose h2,.prose h3{color:var(--text);margin-top:2em;}
.prose ul,.prose ol{padding-left:1.15em;color:var(--muted);margin:0 0 1.1em;}
.prose li{list-style:disc;margin-bottom:.5em;}
.prose ol li{list-style:decimal;}
.prose strong{color:var(--gold-soft);}
.prose a{
  text-decoration:underline;
  text-underline-offset:.25em;
  text-decoration-thickness:1px;
  text-decoration-color:rgba(53,224,208,.45);
}
.prose code{
  font-family:var(--font-mono);
  font-size:.9em;
  color:var(--gold-soft);
  background:rgba(216,169,74,.1);
  padding:.12em .4em;
  border-radius:6px;
}
.hl{color:var(--gold-soft);box-shadow:inset 0 -.5em 0 rgba(216,169,74,.22);}

/* ---------- 4 按钮与状态 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--text);
  --btn-bd:var(--line);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.45em;
  padding:.58em 1.15em;
  border-radius:var(--radius-pill);
  border:1px solid var(--btn-bd);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-sans);
  font-size:.88rem;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),
             border-color .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{text-decoration:none;transform:translateY(-2px);}
.btn:active{transform:translateY(0);}

.btn--coral{
  --btn-bg:var(--coral);
  --btn-bd:var(--coral);
  --btn-fg:#21100B;
  box-shadow:0 12px 26px -16px rgba(255,111,78,.95);
}
.btn--coral:hover{--btn-bg:#ff8768;--btn-fg:#21100B;}

.btn--ghost{--btn-fg:var(--gold-soft);--btn-bd:rgba(216,169,74,.55);}
.btn--ghost:hover{--btn-bg:rgba(216,169,74,.14);--btn-fg:var(--gold-soft);}

.btn--cyan{--btn-bg:var(--cyan);--btn-bd:var(--cyan);--btn-fg:var(--ink-950);}
.btn--cyan:hover{--btn-bg:#5ff1e3;--btn-fg:var(--ink-950);}

.btn--paper{--btn-bg:var(--paper);--btn-bd:var(--paper);--btn-fg:var(--ink-950);}
.btn--paper:hover{--btn-bg:#fffdf6;--btn-fg:var(--ink-950);}

.btn--quiet{--btn-fg:var(--muted);--btn-bd:rgba(46,90,78,.95);}
.btn--quiet:hover{--btn-fg:var(--text);--btn-bg:rgba(53,224,208,.08);}

.btn--sm{font-size:.78rem;padding:.42em .85em;}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.14em;
  padding:.28rem .7rem;
  border-radius:var(--radius-pill);
  background:rgba(216,169,74,.12);
  color:var(--gold-soft);
  border:1px solid rgba(216,169,74,.4);
}

.status{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.13em;
  padding:.3rem .7rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  color:var(--muted);
}
.status::before{
  content:"";
  width:5px;height:5px;border-radius:50%;
  background:currentColor;
  flex:0 0 auto;
}
.status--sync{color:var(--cyan);border-color:rgba(53,224,208,.45);background:rgba(53,224,208,.08);}
.status--gold{color:var(--gold-soft);border-color:rgba(216,169,74,.45);background:rgba(216,169,74,.08);}
.status--ok{color:var(--ok);border-color:rgba(123,216,143,.45);background:rgba(123,216,143,.08);}
.status--warn{color:var(--coral);border-color:rgba(255,111,78,.45);background:rgba(255,111,78,.08);}

/* ---------- 5 页头 ---------- */
.skip-link{
  position:fixed;
  top:.75rem;
  left:1rem;
  z-index:200;
  transform:translateY(-240%);
  background:var(--gold);
  color:var(--ink-950);
  padding:.6rem 1.15rem;
  border-radius:var(--radius-pill);
  font-size:.85rem;
  font-weight:800;
  letter-spacing:.06em;
  box-shadow:var(--shadow-lift);
  transition:transform .22s var(--ease),color .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--ink-950);}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(7,28,24,.97),rgba(7,28,24,.9));
  border-bottom:1px solid rgba(46,90,78,.85);
  backdrop-filter:blur(16px) saturate(130%);
  -webkit-backdrop-filter:blur(16px) saturate(130%);
}

.header-band{
  background:rgba(12,42,36,.82);
  border-bottom:1px solid rgba(46,90,78,.55);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  color:var(--muted);
}
.header-band__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.35rem 1.5rem;
  padding-block:.42rem;
}
.header-status{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  color:var(--cyan);
  letter-spacing:.14em;
}
.header-status::before{
  content:"";
  width:6px;height:6px;border-radius:50%;
  background:var(--ok);
  box-shadow:0 0 0 3px rgba(123,216,143,.16);
  flex:0 0 auto;
}
.header-band__note{margin-left:auto;color:var(--muted);}

.command-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.55rem 1.1rem;
  padding-block:clamp(.6rem,1.5vw,.9rem);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  color:var(--text);
  padding:.15rem 0;
}
.brand:hover{color:var(--text);}
.brand__mark{
  display:grid;
  place-items:center;
  width:2.45rem;
  height:2.45rem;
  flex:0 0 auto;
  border-radius:14px;
  background:linear-gradient(150deg,var(--gold-soft),#a87c2c);
  color:var(--ink-950);
  font-weight:800;
  font-size:1.1rem;
  letter-spacing:0;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.4),0 8px 20px -12px rgba(216,169,74,.9);
}
.brand__text{display:flex;flex-direction:column;line-height:1.1;}
.brand__name{font-weight:800;font-size:1.04rem;letter-spacing:.12em;}
.brand__tag{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.18em;
  color:var(--muted);
  margin-top:.32rem;
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  padding:.5rem .85rem;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:rgba(18,58,49,.65);
  color:var(--text);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{border-color:rgba(216,169,74,.6);}
.nav-toggle__bars{display:inline-grid;gap:4px;width:16px;}
.nav-toggle__bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--gold);
  transition:transform .25s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(3px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){transform:translateY(-3px) rotate(-45deg);}

.primary-nav{margin-left:.5rem;}
.primary-nav__list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.1rem;
  counter-reset:nav-idx;
}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:.4rem;
  padding:.44rem .78rem;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  color:var(--muted);
  font-size:.93rem;
  letter-spacing:.05em;
  white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link::before{
  counter-increment:nav-idx;
  content:counter(nav-idx,decimal-leading-zero);
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.06em;
  color:rgba(46,90,78,1);
  transform:translateY(-.1em);
  transition:color .18s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{
  color:var(--text);
  background:rgba(53,224,208,.09);
  border-color:rgba(53,224,208,.28);
}
.nav-link:hover::before{color:var(--cyan);}
.nav-link[aria-current="page"]{
  color:var(--ink-950);
  background:var(--gold);
  border-color:var(--gold);
  font-weight:700;
}
.nav-link[aria-current="page"]::before{color:rgba(7,28,24,.55);}

.command-actions{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:.5rem;
}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-progress span{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--gold) 58%,var(--coral));
  transition:width .15s linear;
}

/* ---------- 6 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,5.5rem);
  background:
    radial-gradient(700px 320px at 12% 0%,rgba(18,58,49,.9),transparent 72%),
    var(--ink-950);
  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(--gold),var(--cyan) 46%,rgba(255,111,78,.5) 72%,transparent);
}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr));
  gap:clamp(1.8rem,4vw,3.2rem);
  padding-block:clamp(2.4rem,5vw,3.6rem) clamp(1.6rem,4vw,2.4rem);
}

.footer-brand{
  display:flex;
  flex-direction:column;
  gap:.85rem;
  max-width:38ch;
}
.footer-brand .brand__mark{width:2.1rem;height:2.1rem;border-radius:12px;font-size:.95rem;}
.footer-brand__desc{margin:0;color:var(--muted);font-size:.92rem;line-height:1.8;}
.footer-brand__scope{
  margin:0;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.14em;
  line-height:1.95;
  color:var(--gold);
}

.footer-col{min-width:0;}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:.6rem;
  margin:0 0 1rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:600;
  letter-spacing:.2em;
  color:var(--gold);
}
.footer-col__title::after{
  content:"";
  flex:1 1 auto;
  height:1px;
  background:linear-gradient(90deg,rgba(216,169,74,.55),transparent);
}
.footer-col__list{display:grid;gap:.5rem;}
.footer-col__list a{
  display:inline-block;
  padding:.14rem 0;
  color:var(--muted);
  font-size:.93rem;
  letter-spacing:.02em;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.footer-col__list a:hover{
  color:var(--cyan);
  border-bottom-color:rgba(53,224,208,.5);
  transform:translateX(2px);
}

.footer-contact{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem 2.5rem;
  padding-block:1.15rem;
  border-top:1px solid rgba(46,90,78,.6);
}
.footer-contact__line{
  margin:0;
  display:inline-flex;
  align-items:baseline;
  gap:.6rem;
  font-size:.83rem;
  letter-spacing:.02em;
  color:var(--muted);
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.62rem;
  letter-spacing:.18em;
  color:var(--gold);
}

.footer-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem 1.5rem;
  padding-block:1.1rem 2rem;
  border-top:1px solid rgba(46,90,78,.6);
  font-size:.78rem;
  color:rgba(169,189,180,.85);
}
.footer-meta__copy{margin:0;font-family:var(--font-mono);letter-spacing:.08em;}
.footer-meta__icp{margin:0;font-family:var(--font-mono);letter-spacing:.1em;color:var(--muted);}

/* ---------- 7 内容组件 ---------- */
.breadcrumb{
  padding-block:1rem 0;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:var(--muted);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;}
.breadcrumb__list li{display:inline-flex;align-items:center;gap:.45rem;list-style:none;}
.breadcrumb__list li + li::before{content:"/";color:rgba(46,90,78,1);}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb [aria-current="page"]{color:var(--gold-soft);}

.page-head{
  display:grid;
  gap:.9rem;
  padding-block:clamp(1.6rem,4vw,3rem) clamp(1rem,2.5vw,1.8rem);
}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.24em;
  color:var(--cyan);
}
.kicker::before{
  content:"";
  width:26px;height:1px;
  background:linear-gradient(90deg,var(--cyan),transparent);
}
.display-1{
  font-size:clamp(2.4rem,7vw,5rem);
  line-height:1.02;
  letter-spacing:.05em;
  font-weight:800;
  margin:0;
}
.display-2{
  font-size:clamp(1.7rem,3.6vw,2.6rem);
  line-height:1.14;
  letter-spacing:.04em;
  margin:0;
}
.lede{
  max-width:62ch;
  margin:0;
  font-size:clamp(.98rem,1.3vw,1.12rem);
  line-height:1.9;
  color:var(--muted);
}

.card{
  background:linear-gradient(160deg,rgba(18,58,49,.92),rgba(12,42,36,.76));
  border:1px solid rgba(46,90,78,.8);
  border-radius:var(--radius-lg);
  padding:clamp(1.1rem,2.4vw,1.6rem);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.card:hover{border-color:rgba(216,169,74,.55);transform:translateY(-2px);box-shadow:var(--shadow-lift);}

.glass{
  background:linear-gradient(160deg,rgba(18,58,49,.9),rgba(12,42,36,.72));
  border:1px solid rgba(46,90,78,.85);
  border-radius:var(--radius-xl);
  padding:clamp(1.2rem,3vw,2rem);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}

.paper{
  background:var(--paper);
  color:#132A23;
  border-radius:var(--radius-xl);
  padding:clamp(1.25rem,3vw,2.1rem);
  box-shadow:0 24px 50px -34px rgba(0,0,0,.95);
}
.paper h2,.paper h3,.paper h4{color:#0B221C;}
.paper p,.paper li{color:#3A5048;}
.paper a{color:#0F5B4C;text-decoration:underline;text-underline-offset:.25em;}
.paper a:hover{color:#0B221C;}

.toc{
  display:grid;
  gap:.12rem;
  padding:.4rem;
  border:1px solid rgba(46,90,78,.7);
  border-radius:var(--radius-lg);
  background:rgba(12,42,36,.62);
}
.toc-link{
  display:flex;
  align-items:center;
  gap:.6rem;
  padding:.5rem .7rem;
  border-radius:var(--radius-md);
  border-left:2px solid transparent;
  color:var(--muted);
  font-size:.86rem;
  letter-spacing:.02em;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.toc-link::before{
  content:"";
  width:5px;height:5px;
  border-radius:50%;
  background:var(--line);
  flex:0 0 auto;
  transition:background-color .18s var(--ease),box-shadow .18s var(--ease);
}
.toc-link:hover{color:var(--text);background:rgba(53,224,208,.08);}
.toc-link[aria-current="true"]{
  color:var(--cyan);
  background:rgba(53,224,208,.1);
  border-left-color:var(--cyan);
}
.toc-link[aria-current="true"]::before{
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,224,208,.18);
}

.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:
    radial-gradient(120% 90% at 20% 0%,rgba(53,224,208,.16),transparent 60%),
    linear-gradient(150deg,var(--ink-700),var(--ink-800));
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,transparent 52%,rgba(4,18,15,.62));
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:4 / 5;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame__tag{
  position:absolute;
  top:.85rem;left:.85rem;
  z-index:2;
}
.media-frame__caption{
  position:absolute;
  left:.9rem;right:.9rem;bottom:.8rem;
  z-index:2;
  margin:0;
  font-size:.78rem;
  line-height:1.55;
  color:var(--text);
}

/* ---------- 8 响应式 ---------- */
@media (max-width:1080px){
  .nav-toggle{display:inline-flex;margin-left:auto;}
  .primary-nav{
    display:none;
    flex:0 0 100%;
    order:3;
    margin-left:0;
  }
  .primary-nav[data-open="true"]{display:block;}
  .primary-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding-block:.3rem;
  }
  .nav-link{
    display:flex;
    align-items:center;
    gap:.7rem;
    padding:.8rem .85rem;
    border-radius:var(--radius-md);
    border-bottom:1px solid rgba(46,90,78,.42);
  }
  .nav-link::before{transform:none;}
  .command-actions{
    order:4;
    flex:0 0 100%;
    margin-left:0;
    display:flex;
    gap:.55rem;
  }
  .command-actions .btn{flex:1 1 0;}
}

@media (max-width:920px){
  .split,.split--reverse{grid-template-columns:minmax(0,1fr);}
  .rail{position:static;top:auto;}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-brand{grid-column:1 / -1;max-width:none;}
}

@media (max-width:640px){
  :root{--header-offset:8.6rem;}
  .header-band__note{margin-left:0;width:100%;letter-spacing:.1em;}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr);}
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-meta{flex-direction:column;align-items:flex-start;}
  .command-actions .btn{font-size:.8rem;padding:.6em .8em;letter-spacing:.04em;}
  .display-1{letter-spacing:.03em;}
  .footer-contact{gap:.45rem 1.5rem;}
}

/* ---------- 9 动效 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .65s var(--ease),transform .65s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
.js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .js [data-reveal]{opacity:1 !important;transform:none !important;}
  .btn:hover,.card:hover,.footer-col__list a:hover{transform:none;}
  .scroll-progress span{transition:none;}
}