/* ==========================================================================
   摩斯国际官网 · 共享样式表 /assets/site.css
   母题：信号波纹 · 编号索引 · 草原暮色蓝 × 暖奶茶 × 信号橙
   ========================================================================== */

/* ---------- 01 变量 ---------- */
:root{
  --blue:#12304F;
  --blue-deep:#0B1F35;
  --blue-mid:#1E4A73;
  --tea:#E8D5BE;
  --tea-lite:#F6EFE6;
  --orange:#FF7A2F;
  --orange-lite:#FFD8B8;
  --white:#FFFFFF;
  --grass:#3E8E6E;
  --grass-deep:#2A6B50;
  --ink:#4E6478;
  --line-blue:rgba(18,48,79,.16);
  --line-white:rgba(255,255,255,.16);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Heiti SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"Songti SC","STSong",SimSun,"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --t-fast:180ms;
  --t-slow:320ms;
  --ease:cubic-bezier(.2,.65,.25,1);

  --header-h:56px;
  --header-h-compact:44px;
  --maxw:1240px;
  --gutter:clamp(16px,3.2vw,36px);
}

/* ---------- 02 重置与中文排版 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--tea-lite);
  color:var(--blue);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.9;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.2;
  letter-spacing:.01em;
  color:var(--blue);
}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
a{color:inherit;text-decoration:none;}
img{display:block;max-width:100%;height:auto;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
code,kbd,samp,pre{font-family:var(--font-mono);}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px);}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;}

/* ---------- 03 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:12px;
  top:-80px;
  z-index:200;
  display:inline-block;
  padding:10px 18px;
  background:var(--orange);
  color:var(--blue-deep);
  font-family:var(--font-display);
  font-size:13px;
  font-weight:800;
  letter-spacing:.12em;
  transition:top var(--t-fast) var(--ease);
}
.skip-link:focus{top:12px;}

/* ---------- 04 命令栏页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--blue);
  color:var(--white);
  border-bottom:1px solid var(--line-white);
}
.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding-inline:var(--gutter);
  height:var(--header-h);
  transition:height var(--t-slow) var(--ease);
}
.site-header[data-scrolled] .header-inner{height:var(--header-h-compact);}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:none;
  color:var(--white);
}
.brand-mark{
  display:grid;
  grid-template-columns:repeat(3,5px);
  gap:3px;
  align-items:end;
  height:18px;
}
.brand-mark i{display:block;background:var(--orange);height:10px;transition:height var(--t-slow) var(--ease);}
.brand-mark i:nth-child(1){height:8px;background:var(--tea);}
.brand-mark i:nth-child(2){height:14px;}
.brand-mark i:nth-child(3){height:18px;background:var(--tea);}
.site-header[data-scrolled] .brand-mark i:nth-child(3){height:14px;}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-text strong{font-family:var(--font-display);font-size:15px;font-weight:900;letter-spacing:.08em;color:var(--white);}
.brand-text em{font-style:normal;font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--tea);opacity:.85;}

.nav{flex:1 1 auto;min-width:0;}
.nav-list{display:flex;align-items:center;gap:clamp(6px,1.2vw,18px);}
.nav-list a{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:8px 2px;
  font-family:var(--font-display);
  font-size:13px;
  font-weight:600;
  letter-spacing:.09em;
  color:var(--tea);
  white-space:nowrap;
  transition:color var(--t-fast) var(--ease);
}
.nav-list a::before{
  content:"";
  flex:none;
  width:6px;
  height:6px;
  background:var(--orange);
  opacity:0;
  transform:scale(.6);
  transition:opacity var(--t-fast) var(--ease),transform var(--t-fast) var(--ease);
}
.nav-list a:hover{color:var(--white);}
.nav-list a:hover::before{opacity:.6;transform:scale(1);animation:signal-blink .5s steps(1,end) 2;}
.nav-list a[aria-current="page"]{color:var(--white);}
.nav-list a[aria-current="page"]::before{opacity:1;transform:scale(1);}

@keyframes signal-blink{
  0%,100%{opacity:.6;}
  50%{opacity:.12;}
}

.header-actions{display:flex;align-items:center;gap:10px;margin-left:auto;flex:none;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 13px;
  border:1px solid var(--line-white);
  color:var(--white);
  font-family:var(--font-display);
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  transition:background var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.nav-toggle:hover{background:rgba(255,255,255,.08);border-color:var(--orange);}
.nav-toggle-bars{display:grid;gap:3px;width:16px;}
.nav-toggle-bars i{
  display:block;
  height:2px;
  background:var(--orange);
  transition:transform var(--t-fast) var(--ease),opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(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(-5px) rotate(-45deg);}

.scroll-meter{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:0 50%;
}

/* ---------- 05 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:12px 22px;
  font-family:var(--font-display);
  font-size:13px;
  font-weight:800;
  letter-spacing:.14em;
  line-height:1;
  text-decoration:none;
  border:1px solid transparent;
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.btn-signal{background:var(--orange);color:var(--blue-deep);border-color:var(--orange);}
.btn-signal:hover{background:var(--orange-lite);border-color:var(--orange-lite);color:var(--blue-deep);}
.btn-outline{border-color:var(--blue);color:var(--blue);background:transparent;}
.btn-outline:hover{background:var(--blue);color:var(--white);}
.btn-light{border-color:var(--line-white);color:var(--white);background:transparent;}
.btn-light:hover{border-color:var(--orange);color:var(--orange);}

/* ---------- 06 页脚信号台 ---------- */
.site-footer{
  background:var(--blue-deep);
  color:var(--tea);
  font-size:15px;
  line-height:1.8;
}
.footer-inner{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(44px,7vw,84px) var(--gutter) clamp(20px,3vw,32px);
}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:18px;
  padding-bottom:clamp(20px,3vw,32px);
  border-bottom:1px solid var(--line-white);
}
.footer-brand{display:flex;flex-direction:column;gap:6px;color:var(--white);}
.footer-brand-name{
  font-family:var(--font-display);
  font-size:clamp(22px,3vw,30px);
  font-weight:900;
  letter-spacing:.08em;
  color:var(--white);
}
.footer-brand-sub{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--tea);
  opacity:.78;
}
.footer-signal{
  display:flex;
  align-items:center;
  gap:12px;
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--tea);
}

.morse-split{display:inline-flex;align-items:center;gap:5px;color:var(--orange);}
.morse-split i{display:block;width:5px;height:5px;background:currentColor;}
.morse-split i[data-dash]{width:18px;}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(24px,4vw,56px);
  padding:clamp(28px,4vw,48px) 0;
}
.footer-col{min-width:0;}
.footer-title{
  margin:0 0 16px;
  font-family:var(--font-display);
  font-size:12px;
  font-weight:800;
  letter-spacing:.28em;
  color:var(--orange);
}
.footer-links{display:grid;gap:9px;}
.footer-links a{
  display:inline-block;
  font-size:14px;
  color:var(--tea);
  transition:color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease);
}
.footer-links a:hover{color:var(--white);transform:translateX(5px);}
.footer-links-legal{margin-top:18px;padding-top:18px;border-top:1px solid var(--line-white);}
.footer-note{
  margin:18px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--tea);
  opacity:.72;
}
.footer-contact{display:grid;gap:15px;}
.footer-contact li{display:grid;gap:4px;}
.footer-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--orange);
}
.footer-value{
  font-size:14px;
  line-height:1.7;
  color:var(--white);
  word-break:break-word;
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding-top:clamp(18px,3vw,28px);
  border-top:1px solid var(--line-white);
}
.footer-slogan{
  display:flex;
  align-items:center;
  gap:12px;
  margin:0;
  font-family:var(--font-display);
  font-size:13px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--tea);
}
.footer-legal{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--tea);
  opacity:.7;
}

/* ---------- 07 布局容器与分区 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container-narrow{max-width:840px;}
.section{padding:clamp(48px,8vw,112px) 0;}
.section-tea{background:var(--tea-lite);}
.section-tea-mid{background:var(--tea);}
.section-blue{background:var(--blue);color:var(--white);}
.section-deep{background:var(--blue-deep);color:var(--white);}
.section-blue h1,.section-blue h2,.section-blue h3,.section-deep h1,.section-deep h2,.section-deep h3{color:var(--white);}
.section-blue p,.section-deep p{color:var(--tea);}

.grid{display:grid;gap:clamp(20px,3vw,36px);}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr));}

/* ---------- 08 编号章节 ---------- */
.chapter{
  position:relative;
  display:flex;
  gap:clamp(14px,2vw,26px);
  align-items:flex-start;
  padding-left:18px;
  --chapter-accent:var(--orange);
}
.chapter::before{
  content:"";
  position:absolute;
  left:0;
  top:6px;
  bottom:6px;
  width:2px;
  background:var(--chapter-accent);
}
.chapter[data-accent="blue"]{--chapter-accent:var(--blue);}
.chapter[data-accent="tea"]{--chapter-accent:var(--tea);}
.chapter[data-accent="grass"]{--chapter-accent:var(--grass);}
.chapter-no{
  flex:none;
  font-family:var(--font-mono);
  font-size:clamp(38px,6vw,68px);
  font-weight:800;
  line-height:.85;
  letter-spacing:-.03em;
  color:var(--blue);
}
.section-blue .chapter-no,.section-deep .chapter-no{color:var(--white);}
.chapter-body{min-width:0;padding-top:6px;}
.chapter-title{
  font-family:var(--font-display);
  font-size:clamp(19px,2.4vw,26px);
  font-weight:800;
  letter-spacing:.04em;
}
.chapter-text{margin:.6em 0 0;max-width:34em;color:var(--ink);}
.section-blue .chapter-text,.section-deep .chapter-text{color:var(--tea);}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.28em;
  color:var(--ink);
}
.section-blue .kicker,.section-deep .kicker{color:var(--tea);}

.section-head{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:clamp(16px,3vw,40px);
  align-items:start;
  margin-bottom:clamp(28px,4vw,56px);
}
.side-note{
  margin:0;
  writing-mode:vertical-rl;
  white-space:nowrap;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.34em;
  color:var(--ink);
}
.section-blue .side-note,.section-deep .side-note{color:var(--tea);}

/* ---------- 09 正文、卡片与面板 ---------- */
.prose{
  max-width:38em;
  font-size:17px;
  line-height:1.9;
  color:var(--blue);
}
.prose p{margin:0 0 1.1em;}
.prose h2{font-size:clamp(22px,3vw,30px);margin:1.6em 0 .6em;}
.prose h3{font-size:clamp(18px,2.2vw,22px);margin:1.4em 0 .5em;}
.prose ul{margin:0 0 1.1em;}
.prose ul li{position:relative;padding-left:22px;margin-bottom:.5em;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:.85em;
  width:10px;
  height:2px;
  background:var(--orange);
}
.prose strong{font-weight:800;color:var(--blue-deep);}
.prose a{color:var(--blue-mid);text-decoration:underline;text-underline-offset:3px;transition:color var(--t-fast) var(--ease);}
.prose a:hover{color:var(--orange);}

.card{
  background:var(--white);
  border:1px solid var(--line-blue);
  padding:clamp(20px,3vw,32px);
}
.panel{
  background:var(--blue);
  border:1px solid var(--blue-deep);
  color:var(--white);
  padding:clamp(22px,3vw,36px);
}
.panel h2,.panel h3{color:var(--white);}
.panel p{color:var(--tea);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--blue);
  background:var(--tea);
  border:1px solid var(--line-blue);
}
.tag-signal{background:var(--orange-lite);border-color:var(--orange);}
.status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--grass-deep);
}
.status::before{content:"";flex:none;width:8px;height:8px;background:var(--grass);}

/* ---------- 10 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  margin:0;
  padding:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ink);
}
.breadcrumb li{display:flex;align-items:center;gap:10px;}
.breadcrumb li+li::before{
  content:"";
  width:5px;
  height:5px;
  background:var(--orange);
}
.breadcrumb a{color:var(--ink);transition:color var(--t-fast) var(--ease);}
.breadcrumb a:hover{color:var(--blue-mid);}
.breadcrumb [aria-current="page"]{color:var(--blue);font-weight:700;}

/* ---------- 11 图片容器 ---------- */
.figure{
  position:relative;
  overflow:hidden;
  min-height:180px;
  background:var(--blue);
  border:1px solid var(--line-blue);
}
.figure > img{width:100%;height:100%;object-fit:cover;}
.figure-16x9{aspect-ratio:16 / 9;}
.figure-4x3{aspect-ratio:4 / 3;}
.figure-1x1{aspect-ratio:1 / 1;}
.figure-3x4{aspect-ratio:3 / 4;}
.figure-21x9{aspect-ratio:21 / 9;}
.figure-caption{
  margin:10px 0 0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ink);
}

/* ---------- 12 折叠组 ---------- */
.fold{border-top:1px solid var(--line-blue);}
.fold:last-child{border-bottom:1px solid var(--line-blue);}
.fold-head{
  display:flex;
  width:100%;
  align-items:flex-start;
  justify-content:space-between;
  gap:18px;
  padding:20px 0;
  text-align:left;
  font-family:var(--font-display);
  font-size:16px;
  font-weight:700;
  letter-spacing:.03em;
  color:var(--blue);
  transition:color var(--t-fast) var(--ease);
}
.fold-head:hover{color:var(--blue-mid);}
.fold-mark{
  position:relative;
  flex:none;
  width:14px;
  height:14px;
  margin-top:6px;
}
.fold-mark::before,
.fold-mark::after{content:"";position:absolute;background:var(--orange);}
.fold-mark::before{left:0;right:0;top:6px;height:2px;}
.fold-mark::after{top:0;bottom:0;left:6px;width:2px;transition:transform var(--t-slow) var(--ease);}
.fold-head[aria-expanded="true"] .fold-mark::after{transform:scaleY(0);}
.fold-body{overflow:hidden;transition:height var(--t-slow) var(--ease);}
.fold-body[hidden]{display:none;}
.fold-inner{
  padding:0 0 24px;
  max-width:38em;
  font-size:16px;
  line-height:1.9;
  color:var(--ink);
}

/* ---------- 13 进入视口显现 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity var(--t-slow) var(--ease),transform var(--t-slow) var(--ease);
  transition-delay:var(--d,0ms);
}
.js [data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 14 响应式 ---------- */
@media (max-width:960px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex;}
  .nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    z-index:5;
    max-height:0;
    overflow:hidden;
    background:var(--blue-deep);
    border-bottom:1px solid var(--line-white);
    transition:max-height var(--t-slow) var(--ease);
  }
  .nav[data-open]{max-height:min(72vh,540px);overflow-y:auto;}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding:6px 0;}
  .nav-list a{
    padding:15px var(--gutter);
    font-size:14px;
    letter-spacing:.12em;
    border-bottom:1px solid rgba(255,255,255,.08);
  }
  .nav-list li:last-child a{border-bottom:0;}
  .nav-list a::before{width:5px;height:5px;}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:640px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr);}
  .section-head{grid-template-columns:minmax(0,1fr);}
  .side-note{writing-mode:horizontal-tb;letter-spacing:.2em;}

  .chapter{flex-direction:column;gap:10px;}
  .chapter-no{font-size:clamp(34px,12vw,52px);}

  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-top{align-items:flex-start;}
  .footer-base{flex-direction:column;align-items:flex-start;}
}

@media (max-width:560px){
  .brand-text em{display:none;}
  .brand-text strong{font-size:13px;letter-spacing:.04em;}
  .btn{padding:10px 14px;font-size:12px;letter-spacing:.1em;}
  .nav-toggle{padding:7px 10px;}
  .nav-toggle-text{display:none;}
  .header-inner{gap:10px;}
}

/* ---------- 15 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none;}
}