/* ============================================================
   6319登录 · 共享样式 /assets/site.css
   深海蓝仪表盘 + 暖纸长卷 + 霓虹青交互 + 硬边粗野主义
   ============================================================ */

:root{
  --abyss-900:#08192A;
  --abyss-700:#102A42;
  --abyss-500:#1C4467;
  --neon:#3FE3D2;
  --amber:#FF8A3D;
  --paper:#F3EEE3;
  --paper-soft:#FBF8F1;
  --ink:#14191E;
  --slate:#6E8497;
  --mist:#A9C7C4;
  --ok:#3FD68C;
  --warn:#FF6B5E;
  --fg:#F7FAFC;
  --fg-soft:#C6D7E4;
  --ink-soft:#3B4650;
  --rail-w:0px;
  --header-h:104px;
  --gap-block:72px;
  --radius-card:10px;
  --radius-pill:999px;
  --shadow-hard:6px 6px 0 0 #04101C;
  --shadow-hard-paper:6px 6px 0 0 #14191E;
  --ease:cubic-bezier(.22,.8,.28,1);
  --font-display:"HarmonyOS Sans SC","Source Han Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"Source Han Sans SC","PingFang SC",system-ui,-apple-system,"Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,Menlo,Consolas,monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
body{
  margin:0;
  padding-top:var(--header-h);
  padding-left:var(--rail-w);
  background:var(--abyss-900);
  color:var(--fg);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:800;line-height:1.2;letter-spacing:-.02em;margin:0}
h1{font-size:clamp(28px,4.6vw,56px);line-height:1.08}
h2{font-size:clamp(22px,2.8vw,30px)}
h3{font-size:17px;font-weight:600;letter-spacing:0}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--neon);text-decoration:none;transition:color .16s var(--ease)}
a:hover{color:var(--fg)}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--neon);outline-offset:4px;border-radius:4px}
.paper-zone :focus-visible{outline-color:var(--ink)}
::selection{background:var(--neon);color:var(--abyss-900)}

/* ---------- 工具类 ---------- */
.mono{font-family:var(--font-mono);font-weight:500;font-size:14px;letter-spacing:.02em;font-variant-numeric:tabular-nums}

/* ---------- 容器与章节 ---------- */
.container{width:min(1180px,100% - 40px);margin-inline:auto}
.container--narrow{width:min(820px,100% - 40px);margin-inline:auto}
.section{padding-block:var(--gap-block)}
.section-head{display:grid;gap:14px;margin-bottom:38px}
.section-num{font-family:var(--font-mono);font-size:13px;font-weight:600;letter-spacing:.16em;color:var(--neon);text-transform:uppercase}
.section-title{font-size:clamp(24px,3.2vw,38px)}
.section-lead{max-width:62ch;font-size:17px;line-height:1.8;color:var(--fg-soft)}

.grid{display:grid;gap:24px;grid-template-columns:minmax(0,1fr)}
@media (min-width:1024px){
  .grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:start}
}

/* ---------- 色带 ---------- */
.ink-zone{background:var(--abyss-700);color:var(--fg)}
.paper-zone{
  background:var(--paper);
  color:var(--ink);
  padding-block:var(--gap-block);
  border-top:2px solid var(--ink);
  border-bottom:2px solid var(--ink);
}
.paper-zone h1,.paper-zone h2,.paper-zone h3{color:var(--ink)}
.paper-zone p,.paper-zone li{color:var(--ink-soft)}
.paper-zone .section-lead{color:var(--ink-soft)}
.paper-zone .section-num{color:#0B6E63}
.paper-zone a{color:#0B6E63}
.paper-zone a:hover{color:var(--ink)}
.paper-zone .chapter-band{border-bottom-color:rgba(20,25,30,.25)}
.paper-zone .chapter-index{color:#0B6E63}

/* ---------- 章节标题带 ---------- */
.chapter-band{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px;
  padding-bottom:16px;
  margin-bottom:28px;
  border-bottom:2px solid var(--abyss-500);
}
.chapter-index{font-family:var(--font-mono);font-size:14px;font-weight:600;letter-spacing:.12em;color:var(--neon)}
.chapter-title{font-size:clamp(20px,2.4vw,28px)}
.chapter-tag{margin-left:auto}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:48px;
  padding:0 20px;
  border:2px solid transparent;
  border-radius:var(--radius-pill);
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  text-align:center;
  cursor:pointer;
  transition:transform .16s var(--ease),background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),box-shadow .16s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--neon{background:var(--neon);border-color:var(--neon);color:var(--abyss-900);box-shadow:4px 4px 0 0 #04101C}
.btn--neon:hover{background:#63EFE1;color:var(--abyss-900);transform:translateY(-2px);box-shadow:6px 6px 0 0 #04101C}
.btn--amber{background:var(--amber);border-color:var(--amber);color:var(--abyss-900);box-shadow:4px 4px 0 0 #04101C}
.btn--amber:hover{background:#FFA063;color:var(--abyss-900);transform:translateY(-2px);box-shadow:6px 6px 0 0 #04101C}
.btn--ghost{background:transparent;border-color:var(--abyss-500);color:var(--fg)}
.btn--ghost:hover{border-color:var(--neon);color:var(--neon);background:rgba(63,227,210,.08)}
.btn--outline{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn--outline:hover{background:var(--ink);color:var(--paper)}
.btn--ink{background:var(--ink);border-color:var(--ink);color:var(--paper);box-shadow:4px 4px 0 0 rgba(20,25,30,.28)}
.btn--ink:hover{background:#000;color:var(--paper);transform:translateY(-2px);box-shadow:6px 6px 0 0 rgba(20,25,30,.28)}

/* ---------- 资料卡 ---------- */
.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:22px;
  background:var(--abyss-700);
  border:2px solid var(--abyss-500);
  border-radius:var(--radius-card);
  color:var(--fg);
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:var(--neon);box-shadow:var(--shadow-hard)}
.card-tag{align-self:flex-start}
.card-title{font-size:19px;line-height:1.4}
.card-summary{font-size:15.5px;line-height:1.7;color:var(--fg-soft)}
.card-foot{display:flex;align-items:center;gap:10px;margin-top:auto;padding-top:12px;border-top:1px solid var(--abyss-500)}
.card-time{font-family:var(--font-mono);font-size:13px;font-weight:500;letter-spacing:.02em;color:var(--slate)}
.card-more{margin-left:auto;font-size:14px;font-weight:700;color:var(--neon)}
.card-more:hover{color:var(--fg)}
.card--paper{
  background:var(--paper-soft);
  border-color:var(--ink);
  color:var(--ink);
  box-shadow:var(--shadow-hard-paper);
}
.card--paper:hover{border-color:var(--ink);box-shadow:8px 8px 0 0 var(--ink)}
.card--paper .card-title{color:var(--ink)}
.card--paper .card-summary{color:var(--ink-soft)}
.card--paper .card-foot{border-top-color:rgba(20,25,30,.2)}
.card--paper .card-time{color:#5A6772}
.card--paper .card-more{color:#0B6E63}
.card-stack{display:grid;gap:20px}
@media (min-width:768px){.card-stack{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:1080px){
  .card-stack{grid-template-columns:repeat(3,minmax(0,1fr))}
  .card-stack > *:nth-child(3n+2){transform:translateY(18px)}
  .card-stack > *:nth-child(3n+2):hover{transform:translateY(14px)}
}

/* ---------- 标签与状态 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 12px;
  border:2px solid var(--abyss-500);
  border-radius:var(--radius-pill);
  background:rgba(28,68,103,.35);
  font-family:var(--font-mono);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.05em;
  color:var(--mist);
  white-space:nowrap;
}
.tag--ok{border-color:rgba(63,214,140,.55);background:rgba(63,214,140,.1);color:var(--ok)}
.tag--warn{border-color:rgba(255,107,94,.55);background:rgba(255,107,94,.1);color:var(--warn)}
.tag--info{border-color:rgba(63,227,210,.55);background:rgba(63,227,210,.1);color:var(--neon)}
.paper-zone .tag{border-color:rgba(20,25,30,.32);background:rgba(20,25,30,.05);color:var(--ink-soft)}
.paper-zone .tag--ok{border-color:rgba(18,121,79,.5);background:rgba(18,121,79,.08);color:#12794F}
.paper-zone .tag--warn{border-color:rgba(178,58,44,.5);background:rgba(178,58,44,.08);color:#B23A2C}
.paper-zone .tag--info{border-color:rgba(11,110,99,.5);background:rgba(11,110,99,.08);color:#0B6E63}

.status-dot{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--mist);box-shadow:0 0 0 3px rgba(169,199,196,.18);vertical-align:middle}
.status-dot--ok{background:var(--ok);box-shadow:0 0 0 3px rgba(63,214,140,.2)}
.status-dot--warn{background:var(--warn);box-shadow:0 0 0 3px rgba(255,107,94,.2)}

/* ---------- 主题筛选 ---------- */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  padding:12px;
  margin-bottom:26px;
  border:2px solid var(--abyss-500);
  border-radius:var(--radius-pill);
  background:rgba(16,42,66,.55);
}
.filter-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:48px;
  padding:0 16px;
  border:2px solid transparent;
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--fg-soft);
  font-size:14.5px;
  font-weight:600;
  cursor:pointer;
  transition:color .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease);
}
.filter-btn:hover{color:var(--fg);border-color:var(--abyss-500)}
.filter-btn[aria-pressed="true"]{background:var(--neon);border-color:var(--neon);color:var(--abyss-900)}
.filter-count{font-family:var(--font-mono);font-size:12.5px;font-weight:600;opacity:.75}
.paper-zone .filter-bar{background:rgba(255,255,255,.55);border-color:rgba(20,25,30,.28)}
.paper-zone .filter-btn{color:var(--ink-soft)}
.paper-zone .filter-btn:hover{color:var(--ink);border-color:rgba(20,25,30,.28)}
.paper-zone .filter-btn[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--paper-soft)}
.filter-empty{
  padding:30px 20px;
  border:2px dashed var(--abyss-500);
  border-radius:var(--radius-card);
  text-align:center;
  font-size:14.5px;
  color:var(--slate);
}
.paper-zone .filter-empty{border-color:rgba(20,25,30,.35);color:#5A6772}
.is-filtered{display:none !important}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  border:2px solid var(--abyss-500);
  border-radius:var(--radius-card);
  background:linear-gradient(135deg,var(--abyss-700) 0%,var(--abyss-900) 65%);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(90deg,rgba(63,227,210,.07) 0 1px,transparent 1px 14px);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-caption{margin-top:10px;font-family:var(--font-mono);font-size:13px;color:var(--slate);letter-spacing:.02em}
.paper-zone .media-frame{border-color:var(--ink);background:linear-gradient(135deg,#E4DCCB 0%,var(--paper) 70%)}
.paper-zone .media-frame::after{background:repeating-linear-gradient(90deg,rgba(20,25,30,.06) 0 1px,transparent 1px 14px)}
.paper-zone .media-caption{color:#5A6772}

/* ---------- 面包屑 ---------- */
.breadcrumbs{margin-bottom:24px}
.breadcrumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:13.5px;color:var(--slate)}
.breadcrumbs-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs-item + .breadcrumbs-item::before{content:"/";color:var(--abyss-500)}
.breadcrumbs-link{color:var(--mist)}
.breadcrumbs-link:hover{color:var(--neon)}
.breadcrumbs-item[aria-current="page"]{color:var(--fg)}
.paper-zone .breadcrumbs-list{color:#5A6772}
.paper-zone .breadcrumbs-link{color:#0B6E63}

/* ---------- 装饰与动效 ---------- */
.sync-wave{position:relative;width:96px;height:96px;border-radius:50%;border:2px solid var(--abyss-500);display:grid;place-items:center}
.sync-wave::before,.sync-wave::after{content:"";position:absolute;inset:0;border-radius:50%;border:2px solid rgba(63,227,210,.4);animation:sync-wave 3.2s linear infinite}
.sync-wave::after{animation-delay:1.6s}
.sync-wave > span{width:12px;height:12px;border-radius:50%;background:var(--neon)}
@keyframes sync-wave{0%{transform:scale(.62);opacity:.9}100%{transform:scale(1.32);opacity:0}}

.reveal{opacity:1;transform:none;transition:opacity .44s var(--ease),transform .44s var(--ease)}
.has-js .reveal{opacity:0;transform:translateY(12px)}
.has-js .reveal.is-visible{opacity:1;transform:none}

.scroll-progress{position:fixed;top:0;left:var(--rail-w);right:0;height:3px;z-index:120;pointer-events:none}
.scroll-progress > span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--neon),var(--amber));transition:width .12s linear}

/* ============================================================
   头部 · 悬浮胶囊 + 移动端左侧图标栏
   ============================================================ */
.site-header{
  position:fixed;
  top:0;
  left:var(--rail-w);
  right:0;
  z-index:80;
  padding:14px 0 0;
  pointer-events:none;
}
.header-inner{width:min(1180px,100% - 32px);margin-inline:auto;pointer-events:none}

.skip-link{
  position:fixed;
  left:calc(12px + var(--rail-w));
  top:12px;
  z-index:200;
  padding:12px 20px;
  border:2px solid var(--abyss-900);
  border-radius:var(--radius-pill);
  background:var(--neon);
  color:var(--abyss-900);
  font-weight:700;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
  pointer-events:auto;
}
.skip-link:focus{transform:translateY(0);color:var(--abyss-900)}

.rail-nav{display:none}

.nav-capsule{
  position:relative;
  display:flex;
  align-items:center;
  gap:16px;
  padding:10px 12px 10px 14px;
  border:2px solid var(--abyss-500);
  border-radius:var(--radius-pill);
  background:rgba(8,25,42,.74);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  box-shadow:0 12px 28px rgba(3,10,20,.4);
  pointer-events:auto;
  transition:background .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.site-header[data-scrolled] .nav-capsule{
  background:var(--abyss-700);
  border-color:var(--neon);
  box-shadow:6px 6px 0 0 #04101C;
}

.brand{display:inline-flex;align-items:center;gap:11px;color:var(--fg);flex:0 0 auto}
.brand:hover{color:var(--fg)}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:6px 9px;
  border-radius:8px;
  background:var(--neon);
  color:var(--abyss-900);
  font-family:var(--font-mono);
  font-size:15px;
  font-weight:700;
  letter-spacing:.04em;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-family:var(--font-display);font-size:16px;font-weight:800;letter-spacing:-.01em}
.brand-sign{font-size:12px;font-weight:500;letter-spacing:.02em;color:var(--mist)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  min-height:48px;
  padding:0 16px;
  border:2px solid var(--abyss-500);
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--fg);
  font-size:14.5px;
  font-weight:700;
  cursor:pointer;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--neon);color:var(--neon)}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bar{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .22s var(--ease),opacity .22s var(--ease)}
.site-header[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-label{white-space:nowrap}

.nav-panel{display:flex;align-items:center;gap:16px;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  border:2px solid transparent;
  border-radius:var(--radius-pill);
  color:#CFE0EC;
  font-size:14.5px;
  font-weight:500;
  white-space:nowrap;
  transition:color .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease);
}
.nav-link:hover{color:var(--neon);background:rgba(63,227,210,.08);border-color:rgba(63,227,210,.35)}
.nav-link[aria-current="page"]{background:var(--neon);border-color:var(--neon);color:var(--abyss-900);font-weight:700}
.nav-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.nav-actions .btn{min-height:44px;padding:0 16px;font-size:14.5px}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:96px;
  padding-block:58px 28px;
  border-top:2px solid var(--neon);
  background:var(--abyss-900);
  color:var(--fg-soft);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(120% 90% at 100% 0%,rgba(63,227,210,.1),transparent 62%);
}
.footer-inner{position:relative;z-index:1}

.footer-top{display:grid;gap:38px}
@media (min-width:920px){.footer-top{grid-template-columns:minmax(0,1.25fr) minmax(0,1.75fr)}}

.footer-brand-link{display:inline-flex;align-items:center;gap:10px;color:var(--fg)}
.footer-brand-link:hover{color:var(--fg)}
.footer-brand-name{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.01em}
.footer-brand-sign{margin-top:14px;font-size:14px;color:var(--mist)}
.footer-note{margin-top:10px;max-width:40ch;font-size:14px;line-height:1.7;color:var(--slate)}

.footer-cols{display:grid;gap:28px;counter-reset:footer-col}
@media (min-width:560px){.footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}}
.footer-col-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:14px;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--neon);
}
.footer-col-title::before{counter-increment:footer-col;content:"0" counter(footer-col);font-size:12.5px;color:var(--slate)}
.footer-list{display:grid;gap:2px}
.footer-link{display:inline-flex;align-items:center;min-height:44px;font-size:14.5px;color:var(--fg-soft)}
.footer-link:hover{color:var(--neon)}

.footer-contact{
  display:grid;
  gap:12px;
  margin-top:46px;
  padding-top:26px;
  border-top:1px solid var(--abyss-500);
}
@media (min-width:840px){
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact-item--wide{grid-column:1 / -1}
}
.footer-contact-item{
  display:flex;
  align-items:center;
  gap:12px;
  flex-wrap:wrap;
  padding:12px 14px;
  border:2px solid var(--abyss-500);
  border-radius:12px;
  background:rgba(16,42,66,.6);
}
.footer-contact-label{font-size:13px;letter-spacing:.06em;color:var(--slate);white-space:nowrap}
.footer-contact-value{font-size:15px;color:var(--fg)}
.footer-contact-item--wide .footer-contact-value{font-size:14.5px;color:var(--fg-soft)}
.copy-btn{
  margin-left:auto;
  min-height:48px;
  padding:0 16px;
  border:2px solid rgba(63,227,210,.5);
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--neon);
  font-size:13.5px;
  font-weight:700;
  cursor:pointer;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.copy-btn:hover{background:rgba(63,227,210,.14)}
.copy-btn[data-copied]{background:var(--ok);border-color:var(--ok);color:var(--abyss-900)}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 22px;
  margin-top:26px;
  padding-top:20px;
  border-top:1px solid var(--abyss-500);
  font-size:13.5px;
  color:var(--slate);
}
.footer-legal{font-family:var(--font-mono);letter-spacing:.04em}
.footer-meta{margin-left:auto;font-family:var(--font-mono);letter-spacing:.02em}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1040px){
  :root{--header-h:88px}
  .nav-toggle{display:inline-flex}
  .nav-panel{
    position:absolute;
    top:calc(100% + 12px);
    left:0;
    right:0;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:12px;
    margin-left:0;
    padding:14px;
    border:2px solid var(--abyss-500);
    border-radius:20px;
    background:var(--abyss-900);
    box-shadow:8px 8px 0 0 #04101C;
    max-height:calc(100vh - var(--header-h) - 40px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s linear;
  }
  .site-header[data-open] .nav-panel{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{width:100%;min-height:48px;justify-content:flex-start;padding:0 14px;border-radius:12px;font-size:16px}
  .nav-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .nav-actions .btn{width:100%;min-height:48px}
}

@media (max-width:900px){
  :root{--rail-w:56px}
  .rail-nav{
    display:flex;
    position:fixed;
    left:0;
    top:0;
    bottom:0;
    width:56px;
    z-index:90;
    flex-direction:column;
    align-items:center;
    gap:6px;
    padding:12px 0;
    background:var(--abyss-700);
    border-right:2px solid var(--abyss-500);
    overflow-y:auto;
    pointer-events:auto;
  }
  .rail-link{
    display:grid;
    place-items:center;
    width:48px;
    height:48px;
    border:2px solid transparent;
    border-radius:12px;
    color:var(--mist);
    transition:color .16s var(--ease),background .16s var(--ease),border-color .16s var(--ease);
  }
  .rail-link svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
  .rail-link:hover{color:var(--neon);border-color:var(--abyss-500)}
  .rail-link[aria-current="page"]{background:var(--neon);color:var(--abyss-900);border-color:var(--neon)}
}

@media (max-width:640px){
  :root{--gap-block:48px}
  body{font-size:16px}
  .container,.container--narrow{width:calc(100% - 32px)}
  .header-inner{width:calc(100% - 24px)}
  .brand-sign{display:none}
  .nav-capsule{gap:10px;padding:8px 10px 8px 12px}
  .site-footer{margin-top:64px;padding-block:44px 24px}
  .footer-contact-item{padding:12px}
  .copy-btn{width:100%;margin-left:0}
  .footer-meta{margin-left:0}
}

@media (max-width:400px){
  .brand-name{font-size:15px}
  .brand-mark{font-size:14px;padding:5px 7px}
  .nav-toggle{padding:0 12px}
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal,.has-js .reveal{opacity:1 !important;transform:none !important}
  .sync-wave::before,.sync-wave::after{animation:none;opacity:.35}
  .card-stack > *{transform:none !important}
}