/* ==========================================================================
   im-wallet.com.cn — /assets/site.css
   共享外壳：reset · 变量 · 中文排版 · 刊头 · 页脚 · 通用组件
   ========================================================================== */

/* 1. 设计变量 ----------------------------------------------------------- */
:root{
  --ink-900:#070B14;
  --ink-800:#0D1626;
  --text-900:#101827;
  --slate-500:#5C6B84;
  --slate-300:#A7B3C6;
  --mist-100:#EEF2F8;
  --paper:#FFFFFF;
  --brand-600:#1256E0;
  --brand-400:#4F8BFF;
  --brand-100:#E4ECFF;
  --teal-500:#0FB08A;
  --teal-700:#076450;
  --amber-600:#C27A22;
  --glass:rgba(255,255,255,.06);

  --on-dark:#E8EDF6;
  --on-dark-strong:#F5F8FF;
  --on-dark-muted:rgba(167,179,198,.84);
  --on-dark-line:rgba(167,179,198,.16);
  --on-dark-line-strong:rgba(167,179,198,.3);

  --line-soft:#DDE4EF;
  --line-mid:#C7D1E0;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --shell:1200px;
  --gutter:24px;

  --radius-s:6px;
  --radius-m:10px;
  --radius-l:16px;

  --dur-1:120ms;
  --dur-2:180ms;
  --dur-3:240ms;
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* 2. Reset -------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion: no-preference){html{scroll-behavior:smooth}}
html.is-nav-open{overflow:hidden}
body{
  margin:0;
  background:var(--paper);
  color:var(--text-900);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6,p,figure,dl,dd{margin:0}
h1,h2,h3,h4{line-height:1.25;letter-spacing:.01em;color:var(--text-900)}
h1{font-size:clamp(30px,4.6vw,56px);font-weight:700}
h2{font-size:clamp(24px,3vw,34px);font-weight:700}
h3{font-size:20px;font-weight:600}
h4{font-size:16px;font-weight:600}
a{color:var(--brand-600);text-decoration:none;transition:color var(--dur-1) var(--ease)}
a:hover{color:var(--brand-400)}
img,svg{display:block;max-width:100%}
img{height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--brand-400);outline-offset:2px}

/* 3. 工具类 ------------------------------------------------------------- */
.visually-hidden{
  position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.02em;font-variant-numeric:tabular-nums}
#main-content{scroll-margin-top:120px}

/* 4. 结构容器 ----------------------------------------------------------- */
.container{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}
.container--narrow{max-width:760px}
.section{padding:72px 0;background:var(--paper)}
.section--mist{background:var(--mist-100)}
.section--dark{background:var(--ink-900);color:var(--on-dark)}
.section--dark h1,.section--dark h2,.section--dark h3{color:var(--on-dark-strong)}
.section--dark p{color:var(--on-dark-muted)}
.section--tight{padding:48px 0}
.section-head{max-width:720px;margin-bottom:36px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:12px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.18em;color:var(--brand-600);
}
.section--dark .eyebrow{color:var(--brand-400)}
.section-title{margin:0}
.section-lede{margin-top:14px;max-width:62ch;font-size:16px;line-height:1.8;color:var(--slate-500)}
.section--dark .section-lede{color:var(--on-dark-muted)}
.band{
  padding:34px 0;background:var(--ink-900);color:var(--on-dark);
  border-top:1px solid var(--on-dark-line);border-bottom:1px solid var(--on-dark-line);
}
.band__title{font-size:clamp(24px,3.6vw,40px);font-weight:300;line-height:1.2;letter-spacing:.02em;color:var(--on-dark-strong)}
.band__meta{display:block;margin-bottom:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--brand-400)}

/* 5. 正文 --------------------------------------------------------------- */
.prose{max-width:70ch;font-size:16px;line-height:1.7;color:var(--text-900)}
.prose > * + *{margin-top:18px}
.prose h2{margin-top:40px}
.prose h3{margin-top:28px}
.prose ul,.prose ol{padding-left:22px}
.prose li{margin-top:8px}
.prose li::marker{color:var(--brand-600)}
.prose strong{font-weight:600}
.prose code{font-family:var(--font-mono);font-size:13.5px;background:var(--mist-100);padding:2px 6px;border-radius:4px}
.section--dark .prose{color:var(--on-dark)}

/* 6. 刊头 --------------------------------------------------------------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--ink-900);color:var(--on-dark);
  border-bottom:1px solid var(--on-dark-line);
  transition:box-shadow var(--dur-2) var(--ease);
}
.site-header[data-scrolled="true"]{box-shadow:0 12px 34px rgba(7,11,20,.45)}
.site-header__inner{position:relative;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter)}

.skip-link{
  position:absolute;left:16px;top:8px;z-index:5;
  padding:10px 16px;border-radius:var(--radius-m);
  background:var(--paper);color:var(--text-900);
  font-size:14px;font-weight:600;
  transform:translateY(-160%);
  transition:transform var(--dur-2) var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--text-900)}

.read-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(167,179,198,.14)}
.read-progress__fill{display:block;width:0;height:100%;background:var(--brand-600);box-shadow:0 0 10px rgba(18,86,224,.5)}

.masthead-top{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;
  padding:22px 0 12px;
  transition:padding var(--dur-2) var(--ease);
}
.masthead-top__side{display:flex;align-items:center;gap:10px;min-width:0}
.masthead-top__side--start{justify-content:flex-start}
.masthead-top__side--end{justify-content:flex-end}

.brand-block{min-width:0;text-align:center}
.brand{
  display:inline-block;
  font-size:clamp(20px,2.4vw,26px);font-weight:700;letter-spacing:.02em;
  color:var(--on-dark-strong);
  transition:color var(--dur-1) var(--ease),font-size var(--dur-2) var(--ease);
}
.brand:hover{color:#fff}
.brand__descriptor{margin-top:4px;font-size:12px;letter-spacing:.06em;color:var(--on-dark-muted)}

.masthead-nav{padding:2px 0 16px}
.nav-list{display:flex;flex-wrap:wrap;justify-content:center;gap:4px;margin:0;padding:0;list-style:none}
.nav-item{display:block}
.nav-link{
  position:relative;display:block;padding:8px 14px;border-radius:999px;
  font-size:14px;font-weight:500;color:var(--on-dark-muted);
  transition:color var(--dur-1) var(--ease),background var(--dur-1) var(--ease);
}
.nav-link:hover{color:#fff;background:rgba(255,255,255,.06)}
.nav-link[aria-current="page"]{color:#fff;background:rgba(79,139,255,.14)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:3px;width:14px;height:1.5px;
  transform:translateX(-50%);border-radius:2px;background:var(--brand-400);
}

.drawer-steps{display:none}
.drawer-steps__title{
  margin:0 0 10px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.18em;color:var(--on-dark-muted);
}
.drawer-steps__list{display:grid;gap:2px;margin:0;padding:0;list-style:none}
.drawer-steps__link{
  display:block;padding:10px 12px;border-radius:var(--radius-m);
  font-size:14px;font-weight:500;color:var(--brand-400);
  background:rgba(79,139,255,.08);
  transition:background var(--dur-1) var(--ease),color var(--dur-1) var(--ease);
}
.drawer-steps__link:hover{background:rgba(79,139,255,.16);color:#fff}

.nav-toggle{
  display:none;align-items:center;justify-content:center;
  width:44px;height:44px;flex:none;
  border:1px solid var(--on-dark-line-strong);border-radius:var(--radius-m);
  background:rgba(255,255,255,.04);
  transition:background var(--dur-1) var(--ease),border-color var(--dur-1) var(--ease);
}
.nav-toggle:hover{background:rgba(255,255,255,.09);border-color:var(--brand-400)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars i{display:block;height:1.5px;border-radius:2px;background:var(--on-dark);transition:transform var(--dur-2) var(--ease),opacity var(--dur-1) var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

.nav-scrim{
  position:fixed;inset:0;z-index:1;
  background:rgba(7,11,20,.62);
  opacity:0;pointer-events:none;
  transition:opacity var(--dur-2) var(--ease);
}
.nav-scrim[data-open="true"]{opacity:1;pointer-events:auto}

/* 刊头收拢态 */
.site-header[data-scrolled="true"] .brand__descriptor{display:none}
.site-header[data-scrolled="true"] .brand{font-size:18px}
.site-header[data-scrolled="true"] .masthead-top{padding:10px 0 4px}
.site-header[data-scrolled="true"] .masthead-top__side--start{visibility:hidden}
.site-header[data-scrolled="true"] .masthead-nav{padding:0 0 10px}
.site-header[data-scrolled="true"] .nav-link{padding:6px 12px;font-size:13.5px}

/* 7. 按钮 --------------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 18px;border:1px solid transparent;border-radius:var(--radius-m);
  font-size:14px;font-weight:600;letter-spacing:.02em;white-space:nowrap;
  transition:background var(--dur-1) var(--ease),color var(--dur-1) var(--ease),
             border-color var(--dur-1) var(--ease),transform var(--dur-1) var(--ease);
}
.btn--primary{background:var(--brand-600);border-color:var(--brand-600);color:#fff}
.btn--primary:hover{background:var(--brand-400);border-color:var(--brand-400);color:#fff}
.btn--primary:active{transform:translateY(1px)}
.btn--outline{background:transparent;border-color:var(--on-dark-line-strong);color:var(--on-dark)}
.btn--outline:hover{background:rgba(79,139,255,.12);border-color:var(--brand-400);color:#fff}
.btn--sm{height:34px;padding:0 14px;font-size:13px}
.btn--block{width:100%}

/* 8. 页脚 --------------------------------------------------------------- */
.site-footer{
  padding:56px 0 28px;
  background:var(--ink-900);color:#C9D3E4;
  border-top:1px solid var(--on-dark-line);
  font-size:14px;line-height:1.7;
}
.footer-inner{display:block}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr 1.4fr;gap:36px 28px}
.footer-col{min-width:0}
.footer-col__title{
  margin:0 0 14px;font-size:12px;font-weight:600;
  letter-spacing:.14em;color:var(--on-dark-muted);
}
.footer-col__note{margin-top:16px;font-size:12.5px;line-height:1.7;color:var(--on-dark-muted)}
.footer-brand{margin:0;font-size:18px;font-weight:700;letter-spacing:.02em;color:var(--on-dark-strong)}
.footer-brand__descriptor{margin-top:6px;font-size:13px;color:var(--on-dark-muted)}
.footer-brand__note{margin-top:14px;max-width:30ch;font-size:12.5px;line-height:1.7;color:var(--on-dark-muted)}
.footer-links{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.footer-link{display:inline-block;font-size:14px;color:#C9D3E4;transition:color var(--dur-1) var(--ease)}
.footer-link:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}
.footer-contact{display:grid;gap:12px}
.footer-contact__row{display:grid;gap:2px;margin:0}
.footer-contact__label{font-size:11.5px;letter-spacing:.12em;color:var(--on-dark-muted)}
.footer-contact__value{font-size:13.5px;color:var(--on-dark)}
.footer-contact__value--text{font-family:var(--font-sans);font-weight:400;letter-spacing:0;line-height:1.7}
.footer-legal{
  margin-top:40px;padding-top:20px;
  border-top:1px solid var(--on-dark-line);
  font-size:12.5px;line-height:1.8;color:var(--on-dark-muted);
}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  margin-top:16px;font-size:12px;color:var(--on-dark-muted);
}
.footer-icp{font-family:var(--font-mono);letter-spacing:.02em}
.footer-copy{font-family:var(--font-mono);letter-spacing:.02em}

/* 9. 组件 --------------------------------------------------------------- */
/* 卡片 */
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--sidebar{grid-template-columns:220px minmax(0,1fr);gap:40px;align-items:start}
.card-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{
  padding:24px;background:var(--paper);
  border:1px solid var(--line-soft);border-radius:var(--radius-l);
  box-shadow:0 1px 2px rgba(16,24,39,.04);
  transition:border-color var(--dur-1) var(--ease),box-shadow var(--dur-2) var(--ease),transform var(--dur-2) var(--ease);
}
.card:hover{border-color:var(--line-mid);box-shadow:0 12px 30px rgba(16,24,39,.08);transform:translateY(-2px)}
.card__title{margin-bottom:8px;font-size:17px;font-weight:600}
.card__text{font-size:14px;line-height:1.7;color:var(--slate-500)}
.card--dark{
  background:var(--glass);border-color:rgba(167,179,198,.24);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:none;
}
.card--dark:hover{border-color:var(--brand-400);box-shadow:none;transform:translateY(-2px)}
.card--dark .card__title{color:var(--on-dark-strong)}
.card--dark .card__text{color:var(--on-dark-muted)}

/* 步骤与序号 */
.step-numeral{
  font-family:var(--font-mono);font-weight:300;line-height:.9;
  font-size:clamp(56px,9vw,120px);letter-spacing:-.02em;color:var(--brand-600);
}
.timeline{display:grid;gap:0;margin:0;padding:0;list-style:none}
.timeline__item{
  position:relative;isolation:isolate;
  display:grid;grid-template-columns:auto minmax(0,1fr);gap:20px;
  padding-bottom:32px;
}
.timeline__item::before{
  content:"";position:absolute;left:36px;top:76px;bottom:0;width:1px;
  background:repeating-linear-gradient(to bottom,var(--slate-300) 0 6px,transparent 6px 12px);
}
.timeline__item:last-child::before{display:none}
.timeline__num{
  position:relative;
  min-width:72px;font-family:var(--font-mono);font-size:64px;font-weight:300;
  line-height:1;letter-spacing:-.02em;color:var(--brand-600);
}
.timeline__num::before{
  content:attr(data-num);position:absolute;left:4px;top:4px;z-index:-1;color:var(--brand-100);
}
.timeline__body{min-width:0;padding-top:6px}
.timeline__body h3{margin-bottom:6px}
.timeline__body p{font-size:14px;line-height:1.75;color:var(--slate-500)}

/* 状态徽标 */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid transparent;border-radius:999px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.04em;
}
.badge--ok{color:var(--teal-700);background:rgba(15,176,138,.12);border-color:rgba(15,176,138,.3)}
.badge--check{color:var(--brand-600);background:var(--brand-100);border-color:rgba(18,86,224,.22)}
.badge--warn{color:#8C5511;background:rgba(194,122,34,.12);border-color:rgba(194,122,34,.32)}

/* 镜像对照 */
.mirror{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.mirror__col{
  padding:24px;border:1px solid rgba(167,179,198,.24);border-radius:var(--radius-l);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  transition:border-color var(--dur-2) var(--ease),box-shadow var(--dur-2) var(--ease);
}
.mirror__col[data-active="true"]{border-color:var(--brand-400);box-shadow:0 0 0 1px rgba(79,139,255,.35)}
.mirror__title{margin-bottom:14px;font-size:16px;font-weight:600;color:var(--on-dark-strong)}
.mirror__row{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:10px 0;border-bottom:1px dashed rgba(167,179,198,.24)}
.mirror__row:last-child{border-bottom:0}
.mirror__label{font-size:13px;color:var(--on-dark-muted)}
.mirror__value{font-family:var(--font-mono);font-size:13px;font-weight:500;letter-spacing:.02em;color:var(--on-dark-strong);text-align:right;word-break:break-all}

/* 折叠面板 */
.accordion{overflow:hidden;background:var(--paper);border:1px solid var(--line-soft);border-radius:var(--radius-l)}
.accordion__item + .accordion__item{border-top:1px solid var(--line-soft)}
.accordion__trigger{
  display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;
  padding:18px 20px;text-align:left;font-size:15px;font-weight:600;color:var(--text-900);
  transition:background var(--dur-1) var(--ease),color var(--dur-1) var(--ease);
}
.accordion__trigger:hover{background:var(--mist-100)}
.accordion__trigger[aria-expanded="true"]{color:var(--brand-600)}
.accordion__icon{position:relative;flex:none;width:14px;height:14px;color:currentColor}
.accordion__icon::before,.accordion__icon::after{
  content:"";position:absolute;background:currentColor;border-radius:2px;
  transition:transform var(--dur-2) var(--ease),opacity var(--dur-1) var(--ease);
}
.accordion__icon::before{left:0;top:6.5px;width:14px;height:1.5px}
.accordion__icon::after{left:6.5px;top:0;width:1.5px;height:14px}
.accordion__trigger[aria-expanded="true"] .accordion__icon::after{transform:scaleY(0);opacity:0}
.accordion__panel{
  max-height:0;overflow:hidden;visibility:hidden;opacity:0;
  transition:max-height var(--dur-2) var(--ease),opacity var(--dur-2) var(--ease),visibility 0s linear var(--dur-2);
}
.accordion__panel[data-open="true"]{visibility:visible;opacity:1;transition-delay:0s}
.accordion__body{padding:0 20px 22px;font-size:14px;line-height:1.8;color:var(--slate-500)}

/* 筛选条 */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;padding:12px 0}
.filter-chip{
  padding:7px 14px;border:1px solid var(--line-mid);border-radius:999px;
  background:var(--paper);color:var(--slate-500);font-size:13px;font-weight:500;
  transition:background var(--dur-1) var(--ease),color var(--dur-1) var(--ease),border-color var(--dur-1) var(--ease);
}
.filter-chip:hover{border-color:var(--brand-400);color:var(--brand-600)}
.filter-chip[aria-pressed="true"]{background:var(--brand-600);border-color:var(--brand-600);color:#fff}

/* 锚点目录与面包屑 */
.toc{display:grid;gap:2px}
.toc__link{
  display:block;padding:7px 12px;border-left:2px solid var(--line-soft);
  font-size:13px;color:var(--slate-500);
  transition:color var(--dur-1) var(--ease),border-color var(--dur-1) var(--ease),background var(--dur-1) var(--ease);
}
.toc__link:hover{color:var(--text-900);background:var(--mist-100)}
.toc__link[aria-current="true"]{color:var(--brand-600);border-left-color:var(--brand-600);background:var(--brand-100)}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--slate-500)}
.breadcrumb a{color:var(--slate-500)}
.breadcrumb a:hover{color:var(--brand-600)}
.breadcrumb__sep{color:var(--slate-300)}
.breadcrumb [aria-current="page"]{color:var(--text-900)}

/* 表格 */
.table-wrap{overflow-x:auto;background:var(--paper);border:1px solid var(--line-soft);border-radius:var(--radius-l)}
.data-table{width:100%;min-width:560px;border-collapse:collapse;font-size:14px}
.data-table th{
  padding:12px 16px;background:var(--mist-100);border-bottom:1px solid var(--line-soft);
  font-size:12px;font-weight:600;letter-spacing:.08em;color:var(--slate-500);
  text-align:left;white-space:nowrap;
}
.data-table td{padding:14px 16px;border-bottom:1px solid var(--line-soft);vertical-align:top;line-height:1.6}
.data-table tr:last-child td{border-bottom:0}
.data-table .mono{font-size:13px}

/* 提示与清单 */
.safe-note{
  display:flex;align-items:flex-start;gap:12px;
  padding:14px 18px;border-radius:var(--radius-m);
  background:rgba(18,86,224,.08);border:1px solid rgba(18,86,224,.18);
  font-size:13.5px;line-height:1.7;color:var(--text-900);
}
.safe-note__icon{flex:none;width:18px;height:18px;margin-top:3px;color:var(--brand-600)}
.safe-note__text{margin:0}
.safe-note--dark{background:rgba(79,139,255,.1);border-color:rgba(79,139,255,.28);color:var(--on-dark)}
.safe-note--dark .safe-note__icon{color:var(--brand-400)}
.callout{
  display:flex;align-items:flex-start;gap:12px;
  padding:16px 18px;border-radius:var(--radius-m);
  background:rgba(194,122,34,.08);border:1px solid rgba(194,122,34,.28);
  font-size:14px;line-height:1.7;color:var(--text-900);
}
.callout__mark{flex:none;width:16px;height:2px;margin-top:11px;border-radius:2px;background:var(--amber-600)}
.checklist{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.checklist__item{position:relative;padding-left:24px;font-size:14px;line-height:1.7;color:var(--slate-500)}
.checklist__item::before{
  content:"";position:absolute;left:0;top:5px;width:14px;height:14px;
  border:1.5px solid var(--teal-500);border-radius:4px;background:rgba(15,176,138,.08);
}

/* 地址与图片容器 */
.addr{
  display:inline-flex;align-items:center;gap:10px;max-width:100%;
  padding:6px 10px;border:1px solid var(--line-soft);border-radius:var(--radius-s);
  background:var(--mist-100);font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;color:var(--text-900);
}
.addr__text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.addr[data-expanded="true"] .addr__text{white-space:normal;word-break:break-all}
.addr__toggle{font-family:var(--font-sans);font-size:12px;color:var(--brand-600);flex:none}
.media-frame{
  position:relative;width:100%;overflow:hidden;
  background:var(--mist-100);border:1px solid var(--line-soft);border-radius:var(--radius-l);
}
.media-frame > img,.media-frame > svg{width:100%;height:100%;object-fit:cover}
.media-frame--phone{aspect-ratio:9/19;max-width:320px;margin-inline:auto}
.media-frame--panel{aspect-ratio:16/10}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--dark{background:var(--ink-800);border-color:rgba(167,179,198,.24)}
.media-frame__label{
  position:absolute;left:12px;bottom:12px;
  padding:3px 9px;border-radius:999px;
  background:rgba(7,11,20,.7);color:var(--on-dark);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
}
.media-frame__label--light{background:rgba(255,255,255,.85);color:var(--text-900)}

/* 显现动效 */
.reveal{opacity:0;transform:translateY(8px);transition:opacity var(--dur-3) var(--ease),transform var(--dur-3) var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* 10. 响应式 ------------------------------------------------------------ */
@media (max-width:1100px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px 24px}
  .footer-col--brand{grid-column:1/-1}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:1024px){
  .grid--sidebar{grid-template-columns:1fr;gap:28px}
}
@media (max-width:900px){
  .masthead-top{grid-template-columns:1fr auto;align-items:center;padding:14px 0}
  .masthead-top__side--start{display:none}
  .masthead-top__side--end .btn{display:none}
  .brand-block{text-align:left}
  .nav-toggle{display:inline-flex}
  .masthead-nav{
    position:fixed;left:0;right:0;bottom:0;z-index:3;
    max-height:82vh;overflow-y:auto;
    padding:20px 20px calc(24px + env(safe-area-inset-bottom));
    background:var(--ink-800);
    border-top:1px solid var(--on-dark-line-strong);
    border-radius:16px 16px 0 0;
    box-shadow:0 -18px 48px rgba(7,11,20,.55);
    transform:translateY(100%);opacity:0;visibility:hidden;
    transition:transform var(--dur-3) var(--ease),opacity var(--dur-2) var(--ease),visibility 0s linear var(--dur-3);
  }
  .masthead-nav[data-open="true"]{transform:translateY(0);opacity:1;visibility:visible;transition-delay:0s}
  .nav-list{flex-direction:column;gap:2px}
  .nav-link{padding:14px 12px;border-radius:var(--radius-m);font-size:16px}
  .nav-link[aria-current="page"]::after{left:12px;bottom:8px;transform:none}
  .drawer-steps{display:block;margin-top:16px;padding-top:16px;border-top:1px dashed rgba(167,179,198,.24)}
  .site-header[data-scrolled="true"] .masthead-top{padding:10px 0}
  .site-header[data-scrolled="true"] .nav-link{padding:14px 12px;font-size:16px}
  .section{padding:56px 0}
  .section--tight{padding:40px 0}
  .mirror{grid-template-columns:1fr}
  .timeline__num{font-size:48px;min-width:52px}
  .timeline__item::before{left:26px;top:58px}
}
@media (max-width:720px){
  .grid--2,.grid--3{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-col--brand{grid-column:auto}
}
@media (max-width:640px){
  :root{--gutter:20px}
  .footer-grid{gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* 11. 减少动效 ---------------------------------------------------------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
  .card:hover{transform:none}
  .btn--primary:active{transform:none}
}