/* ==========================================================================
   博鱼赛场 · 共享外壳样式表  /assets/site.css
   深海地图 × 杂志报头
   ========================================================================== */

/* ---------- 1. 重置 ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  font-size:17px;
}

body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
a{color:inherit;text-decoration:none}
[hidden]{display:none!important}

/* ---------- 2. 变量 ---------- */
:root{
  --sand:#F5EFE4;
  --paper:#FBF8F2;
  --deep:#0B2A45;
  --deep-2:#123A5C;
  --ink:#101820;
  --ink-soft:#38454F;
  --coral:#FF6B45;
  --aqua:#2EE6D6;
  --tide:#1E6F9F;
  --kelp:#0F7B6C;
  --dusk:#6B7A86;
  --glow:#FFD166;

  --rule:rgba(16,24,32,.13);
  --rule-2:rgba(16,24,32,.26);
  --rule-inv:rgba(251,248,242,.16);

  --shadow-1:0 1px 2px rgba(11,42,69,.05),0 14px 32px -26px rgba(11,42,69,.55);
  --shadow-2:0 20px 48px -30px rgba(11,42,69,.62);

  --r-xs:2px;
  --r-sm:4px;
  --r-md:8px;
  --r-pill:999px;

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Heiti SC","Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --shell:1180px;
  --gutter:clamp(1.1rem,4vw,2.5rem);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--sand);
  background-image:
    radial-gradient(1200px 620px at 6% -12%, rgba(46,230,214,.075), transparent 62%),
    radial-gradient(900px 520px at 102% -4%, rgba(255,107,69,.075), transparent 58%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:1.8;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.16;
  letter-spacing:-.012em;
  color:var(--deep);
}

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

::selection{background:var(--aqua);color:var(--deep)}

:focus-visible{
  outline:2px solid var(--coral);
  outline-offset:3px;
  border-radius:var(--r-xs);
}

/* ---------- 4. 布局工具 ---------- */
.wrap{
  width:min(var(--shell),100% - var(--gutter) * 2);
  margin-inline:auto;
}

.section{padding-block:clamp(3rem,7vw,5.6rem)}
.section--tight{padding-block:clamp(1.8rem,4vw,3rem)}

.stack{display:grid;gap:clamp(1.1rem,2.6vw,1.9rem)}

.grid{display:grid;gap:clamp(1rem,2.4vw,1.7rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}

@media (max-width:960px){
  .grid--2,
  .grid--3,
  .grid--split{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 5. 跳至主要内容 ---------- */
.skip-link{
  position:fixed;
  top:0;
  left:50%;
  z-index:200;
  transform:translate(-50%,-140%);
  padding:.62rem 1.15rem;
  background:var(--deep);
  color:var(--paper);
  border-radius:0 0 var(--r-md) var(--r-md);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  box-shadow:var(--shadow-2);
  transition:transform .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,0)}

/* ---------- 6. 刊头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(245,239,228,.98),rgba(245,239,228,.93));
  border-bottom:1px solid var(--rule);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  pointer-events:none;
  background:linear-gradient(90deg,transparent 0%,var(--aqua) 20%,var(--coral) 54%,var(--deep) 84%,transparent 100%);
  opacity:.45;
}

.header-inner{
  width:min(var(--shell),100% - var(--gutter) * 2);
  margin-inline:auto;
  padding-block:1.05rem .75rem;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.5rem;
  transition:padding-block .28s var(--ease);
}
.site-header.is-condensed .header-inner{padding-block:.5rem .45rem}

/* 报头主体 */
.masthead{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:clamp(.9rem,3vw,2.4rem);
  width:100%;
}
.masthead__rule{
  flex:1 1 0;
  min-width:20px;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--rule-2));
}
.masthead__rule:last-child{
  background:linear-gradient(270deg,transparent,var(--rule-2));
}

.masthead__tagline{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--dusk);
  text-align:center;
}

/* 品牌 */
.brand{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  padding:.18rem .3rem;
  border-radius:var(--r-sm);
}
.brand__mark{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  border-radius:50%;
  background:var(--deep);
  color:var(--aqua);
  box-shadow:inset 0 0 0 1px rgba(46,230,214,.35);
  transition:width .28s var(--ease),height .28s var(--ease);
}
.site-header.is-condensed .brand__mark{width:28px;height:28px}
.brand__text{display:flex;flex-direction:column;line-height:1}
.brand__name{
  font-family:var(--font-display);
  font-size:clamp(1.32rem,2.4vw,1.82rem);
  font-weight:900;
  letter-spacing:.05em;
  color:var(--deep);
}
.brand__latin{
  margin-top:.3rem;
  font-family:var(--font-mono);
  font-size:.58rem;
  letter-spacing:.4em;
  color:var(--dusk);
  white-space:nowrap;
}

/* 导航 */
.site-nav{
  width:100%;
  display:flex;
  justify-content:center;
}
.site-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:clamp(.15rem,1.1vw,.9rem);
}
.site-nav__link{
  position:relative;
  display:inline-block;
  padding:.42rem .7rem;
  border-radius:var(--r-sm);
  font-family:var(--font-mono);
  font-size:.79rem;
  letter-spacing:.14em;
  color:var(--ink-soft);
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:.7rem;
  right:.7rem;
  bottom:.2rem;
  height:1px;
  background:var(--coral);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .26s var(--ease);
}
.site-nav__link:hover{
  color:var(--deep);
  background:rgba(11,42,69,.05);
}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{
  color:var(--deep);
  background:var(--paper);
  box-shadow:inset 0 0 0 1px var(--rule-2);
}
.site-nav__link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--aqua);
}

/* 折叠按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.55rem;
  margin-top:.1rem;
  padding:.5rem .95rem;
  background:var(--paper);
  border:1px solid var(--rule-2);
  border-radius:var(--r-pill);
  color:var(--deep);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.18em;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{background:var(--deep);color:var(--paper)}
.nav-toggle__bars{
  position:relative;
  width:16px;
  height:11px;
  flex:0 0 auto;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:1.5px;
  background:currentColor;
  border-radius:2px;
  transition:transform .24s var(--ease),top .24s var(--ease),bottom .24s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4.5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{bottom:4.5px;transform:rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

/* ---------- 7. 右侧固定功能岛 ---------- */
.function-island{
  position:fixed;
  top:.85rem;
  right:clamp(.8rem,2vw,1.7rem);
  z-index:90;
  display:flex;
  align-items:center;
  gap:.3rem;
  padding:.34rem;
  border-radius:var(--r-pill);
  background:rgba(11,42,69,.95);
  border:1px solid rgba(46,230,214,.3);
  box-shadow:var(--shadow-2);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.island__chip{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  padding:.4rem .8rem;
  border-radius:var(--r-pill);
  background:rgba(46,230,214,.13);
  border:1px solid rgba(46,230,214,.5);
  color:var(--aqua);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  white-space:nowrap;
  transition:background-color .2s var(--ease);
}
.island__chip:hover{background:rgba(46,230,214,.24)}
.island__dot{
  width:6px;
  height:6px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--aqua);
  box-shadow:0 0 0 3px rgba(46,230,214,.16);
  animation:island-pulse 2.8s ease-in-out infinite;
}
@keyframes island-pulse{
  0%,100%{opacity:1}
  50%{opacity:.4}
}
.island__sep{
  width:1px;
  height:15px;
  background:rgba(251,248,242,.22);
}
.island__link{
  padding:.4rem .72rem;
  border-radius:var(--r-pill);
  color:rgba(251,248,242,.82);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  white-space:nowrap;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.island__link:hover{background:rgba(251,248,242,.14);color:#fff}

/* ---------- 8. 章节骨架 ---------- */
.section__head{
  display:flex;
  flex-direction:column;
  gap:.55rem;
  margin-bottom:clamp(1.3rem,3vw,2.3rem);
}
.section__eyebrow{
  display:flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--coral);
}
.section__eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--coral);
}
.section__title{
  font-size:clamp(1.85rem,4.2vw,2.85rem);
  font-weight:900;
}
.section__lede{
  max-width:36em;
  font-size:1.02rem;
  line-height:1.86;
  color:var(--ink-soft);
}

/* ---------- 9. 堆叠面板 ---------- */
.panel{
  position:relative;
  padding:clamp(1.35rem,3vw,2.5rem);
  background:var(--paper);
  border:1px solid var(--rule);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-1);
}
.panel--sand{
  background:var(--sand);
  box-shadow:none;
}
.panel--deep{
  background:var(--deep);
  border-color:rgba(46,230,214,.22);
  color:rgba(251,248,242,.82);
}
.panel--deep h1,
.panel--deep h2,
.panel--deep h3{color:var(--paper)}
.panel--deep .section__lede,
.panel--deep .card__body{color:rgba(251,248,242,.76)}

/* ---------- 10. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.78rem 1.35rem;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.14em;
  cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--coral{
  background:var(--coral);
  color:#fff;
  box-shadow:0 12px 26px -16px rgba(255,107,69,.95);
}
.btn--coral:hover{background:#ff7f5e;transform:translateY(-1px)}
.btn--deep{
  background:var(--deep);
  color:var(--paper);
}
.btn--deep:hover{background:var(--deep-2);transform:translateY(-1px)}
.btn--ghost{
  background:transparent;
  border-color:var(--rule-2);
  color:var(--deep);
}
.btn--ghost:hover{border-color:var(--deep);background:rgba(11,42,69,.06)}
.btn--aqua{
  background:var(--aqua);
  color:#06231f;
}
.btn--aqua:hover{background:#5beeE1;transform:translateY(-1px)}

/* ---------- 11. 筛选按钮与状态 ---------- */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.42rem .9rem;
  background:var(--paper);
  border:1px solid var(--rule-2);
  border-radius:var(--r-pill);
  color:var(--ink-soft);
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.chip:hover{
  border-color:var(--deep);
  color:var(--deep);
}
.chip[aria-pressed="true"]{
  background:var(--deep);
  border-color:var(--deep);
  color:var(--aqua);
}
.filter-status{
  margin-left:.35rem;
  font-family:var(--font-mono);
  font-size:.69rem;
  letter-spacing:.1em;
  color:var(--dusk);
}
[data-filter-item]{
  transition:opacity .26s var(--ease),transform .26s var(--ease);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb{padding-block:1rem .3rem}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.1em;
  color:var(--dusk);
}
.breadcrumb__list li{
  display:inline-flex;
  align-items:center;
}
.breadcrumb__list li::after{
  content:"/";
  margin-inline:.5rem;
  color:var(--rule-2);
}
.breadcrumb__list li:last-child::after{content:""}
.breadcrumb__list a{
  color:var(--tide);
  transition:color .2s var(--ease);
}
.breadcrumb__list a:hover{color:var(--coral)}
.breadcrumb__list [aria-current="page"]{color:var(--ink)}

/* ---------- 13. 卡片 ---------- */
.card{
  display:flex;
  flex-direction:column;
  padding:1.3rem 1.4rem;
  background:var(--paper);
  border:1px solid var(--rule);
  border-radius:var(--r-md);
  box-shadow:var(--shadow-1);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease);
}
.card:hover{
  transform:translateY(-3px);
  border-color:rgba(30,111,159,.4);
  box-shadow:var(--shadow-2);
}
.card__title{
  font-size:1.14rem;
  font-weight:900;
  color:var(--deep);
  margin-bottom:.4rem;
}
.card__body{
  font-size:.94rem;
  line-height:1.8;
  color:var(--ink-soft);
}
.card__meta{
  margin-top:auto;
  padding-top:.9rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  color:var(--dusk);
}

/* ---------- 14. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.34rem;
  padding:.24rem .62rem;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:.65rem;
  letter-spacing:.1em;
  white-space:nowrap;
}
.tag--aqua{background:rgba(46,230,214,.15);border-color:rgba(46,230,214,.45);color:#0a6a63}
.tag--coral{background:rgba(255,107,69,.13);border-color:rgba(255,107,69,.42);color:#bf3a17}
.tag--tide{background:rgba(30,111,159,.11);border-color:rgba(30,111,159,.34);color:#155a80}
.tag--glow{background:rgba(255,209,102,.22);border-color:rgba(255,209,102,.6);color:#8a6200}
.tag--kelp{background:rgba(15,123,108,.13);border-color:rgba(15,123,108,.36);color:#0a5b50}

/* ---------- 15. 纵向注释 ---------- */
.note-v{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.42em;
  text-transform:uppercase;
  color:var(--dusk);
}

/* ---------- 16. 媒体容器（页面阶段放图片占位） ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  border:1px solid var(--rule);
  border-radius:var(--r-md);
  background:linear-gradient(145deg,#0B2A45 0%,#123A5C 52%,#1E6F9F 100%);
}
.media-frame > img,
.media-frame > svg,
.media-frame > video,
.media-frame > .media-frame__fill{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  opacity:.42;
  background-image:repeating-linear-gradient(0deg,rgba(251,248,242,.05) 0 1px,transparent 1px 4px);
}
.media-frame--band{aspect-ratio:21/9}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--sq{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame__cap{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  z-index:2;
  padding:.75rem 1rem;
  background:linear-gradient(180deg,transparent,rgba(11,42,69,.88));
  color:rgba(251,248,242,.88);
  font-family:var(--font-mono);
  font-size:.67rem;
  letter-spacing:.12em;
}

/* ---------- 17. 正文容器 ---------- */
.prose{
  max-width:40em;
  font-size:1rem;
  line-height:1.86;
  color:var(--ink-soft);
}
.prose p + p{margin-top:1rem}
.prose h2,
.prose h3{
  margin-top:1.9rem;
  margin-bottom:.6rem;
  color:var(--deep);
}
.prose h2{font-size:clamp(1.4rem,2.6vw,1.85rem)}
.prose h3{font-size:1.18rem}
.prose ul,
.prose ol{display:grid;gap:.5rem;margin-top:.8rem}
.prose li{
  position:relative;
  padding-left:1.15rem;
}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:7px;
  height:1px;
  background:var(--coral);
}
.prose a{
  color:var(--tide);
  border-bottom:1px solid rgba(30,111,159,.35);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.prose a:hover{color:var(--coral);border-bottom-color:var(--coral)}

/* ---------- 18. 显现动效 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .62s var(--ease),transform .62s var(--ease);
}
.js [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 19. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,5.5rem);
  background:var(--deep);
  color:rgba(251,248,242,.76);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(760px 320px at 10% -6%, rgba(46,230,214,.14), transparent 66%),
    radial-gradient(620px 300px at 92% 4%, rgba(255,107,69,.13), transparent 62%);
}
.footer-tide{
  position:relative;
  height:2px;
  background:linear-gradient(90deg,transparent 0%,var(--aqua) 26%,var(--coral) 62%,transparent 100%);
  opacity:.65;
}
.footer-inner{
  position:relative;
  z-index:1;
  width:min(var(--shell),100% - var(--gutter) * 2);
  margin-inline:auto;
  padding-block:clamp(2.4rem,6vw,4.2rem) 1.5rem;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr));
  gap:clamp(1.4rem,3vw,2.6rem);
}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:.55rem;
  margin-bottom:1rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:500;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--aqua);
}
.footer-col__title::after{
  content:"";
  flex:1 1 auto;
  height:1px;
  background:rgba(46,230,214,.26);
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:1.5rem;
  font-weight:900;
  letter-spacing:.05em;
  color:var(--paper);
}
.footer-brand__domain{
  margin-top:.45rem;
  font-family:var(--font-mono);
  font-size:.71rem;
  letter-spacing:.2em;
  color:var(--aqua);
}
.footer-brand__note{
  margin-top:.9rem;
  max-width:24em;
  font-size:.9rem;
  line-height:1.8;
  color:rgba(251,248,242,.64);
}
.footer-links{display:grid;gap:.55rem}
.footer-links a{
  font-size:.92rem;
  color:rgba(251,248,242,.78);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-links a:hover{
  color:var(--aqua);
  border-bottom-color:rgba(46,230,214,.6);
}
.footer-contact{display:grid;gap:.7rem}
.footer-contact li{
  position:relative;
  padding-left:.95rem;
  font-size:.89rem;
  line-height:1.72;
  color:rgba(251,248,242,.72);
  word-break:break-word;
}
.footer-contact li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--coral);
}
.footer-bottom{
  margin-top:clamp(2rem,4vw,3rem);
  padding-top:1.15rem;
  border-top:1px solid var(--rule-inv);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.6rem;
  font-family:var(--font-mono);
  font-size:.69rem;
  letter-spacing:.1em;
  color:rgba(251,248,242,.52);
}

/* ---------- 20. 响应式 ---------- */
@media (max-width:1040px){
  .function-island{
    top:auto;
    bottom:1rem;
    right:1rem;
    padding:.3rem;
  }
  .function-island .island__link,
  .function-island .island__sep{display:none}
  .island__chip{
    padding:.36rem .72rem;
    font-size:.66rem;
  }
}

@media (max-width:980px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:880px){
  html{font-size:16px}

  .header-inner{
    padding-block:.85rem .9rem;
    gap:.55rem;
  }
  .masthead{gap:.8rem}
  .masthead__rule{min-width:14px}
  .masthead__tagline{
    font-size:.6rem;
    letter-spacing:.2em;
  }
  .nav-toggle{display:inline-flex}

  .site-nav{
    width:100%;
    max-height:0;
    opacity:0;
    overflow:hidden;
    transform:translateY(-6px);
    transition:max-height .34s var(--ease),opacity .24s var(--ease),transform .3s var(--ease);
  }
  .site-nav[data-open]{
    max-height:34rem;
    opacity:1;
    transform:none;
  }
  .site-nav__list{
    flex-direction:column;
    width:100%;
    gap:0;
    padding-block:.35rem;
  }
  .site-nav__item{width:100%}
  .site-nav__link{
    display:block;
    width:100%;
    text-align:center;
    padding:.85rem .5rem;
    font-size:.84rem;
    letter-spacing:.18em;
    border-bottom:1px solid var(--rule);
    border-radius:0;
  }
  .site-nav__link::after{display:none}
  .site-nav__link:hover{background:rgba(11,42,69,.05)}
  .site-nav__link[aria-current="page"]{
    background:rgba(255,107,69,.09);
    box-shadow:none;
    border-bottom-color:rgba(255,107,69,.35);
  }
}

@media (min-width:881px){
  .site-nav[data-open]{
    max-height:none;
    opacity:1;
    transform:none;
    overflow:visible;
  }
}

@media (max-width:620px){
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{
    flex-direction:column;
    align-items:flex-start;
  }
  .function-island{bottom:.75rem;right:.75rem}
  .island__chip-text{letter-spacing:.1em}
}

/* ---------- 21. 无障碍与降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .js [data-reveal]{
    opacity:1;
    transform:none;
  }
}