/* ===== 01 重置 ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}

/* ===== 02 变量 ===== */
:root{
  --ink-900:#0B1A2E;
  --ink-800:#122A45;
  --ink-700:#1D3A5C;
  --gold:#E8C36A;
  --gold-soft:#F5DFA6;
  --cinnabar:#B33A2B;
  --cinnabar-deep:#7A2A20;
  --celadon:#6FA79B;
  --celadon-deep:#2E5A4E;
  --paper:#F2EDE3;
  --mist:#9AA7B8;

  --rail-w:248px;
  --header-h:64px;
  --gutter:clamp(18px,4vw,56px);
  --measure:1240px;
  --line:1px solid rgba(232,195,106,.22);
  --line-soft:1px solid rgba(232,195,106,.14);
  --shadow-paper:0 18px 40px -28px rgba(0,0,0,.92),0 2px 0 rgba(232,195,106,.10);
  --ease:cubic-bezier(.22,.61,.36,1);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,monospace;
}

/* ===== 03 基础排版 ===== */
body{
  min-height:100vh;
  background:var(--ink-900);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:900;line-height:1.12;letter-spacing:.02em;color:var(--paper)}
h1{font-size:clamp(34px,5.4vw,72px)}
h2{font-size:clamp(26px,3.4vw,44px)}
h3{font-size:clamp(19px,2.1vw,27px)}
p{max-width:100%}
::selection{background:var(--gold);color:var(--ink-900)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:1px}
#main-content{outline:none}
#main-content:focus-visible{outline:2px dashed rgba(232,195,106,.6);outline-offset:-8px}

/* ===== 04 通用容器与文本工具 ===== */
.wrap{width:100%;max-width:var(--measure);margin-inline:auto;padding-inline:var(--gutter)}
.prose{max-width:68ch;font-size:17px;line-height:1.85;color:rgba(242,237,227,.9)}
.prose p+p{margin-top:1.1em}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.eyebrow{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.28em;
  text-transform:uppercase;color:var(--celadon);
}
.annotation{font-size:12px;line-height:1.8;letter-spacing:.14em;color:var(--mist)}
.annotation--vertical{writing-mode:vertical-rl;letter-spacing:.3em;font-size:12px;color:var(--mist)}
.rule{height:1px;border:0;background:linear-gradient(90deg,rgba(232,195,106,.55),rgba(232,195,106,0))}

/* ===== 05 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border:1px solid transparent;border-radius:2px;
  font-size:14px;font-weight:700;letter-spacing:.12em;text-decoration:none;
  cursor:pointer;transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn--primary{background:var(--cinnabar);color:var(--paper);border-color:rgba(0,0,0,.28);box-shadow:0 12px 28px -18px rgba(179,58,43,.95)}
.btn--primary:hover{background:#C74331}
.btn--ghost{background:transparent;color:var(--gold);border-color:rgba(232,195,106,.5)}
.btn--ghost:hover{background:rgba(232,195,106,.1);border-color:var(--gold);color:var(--gold-soft)}
.btn--quiet{background:rgba(242,237,227,.06);color:var(--paper);border-color:rgba(242,237,227,.18)}
.btn--quiet:hover{background:rgba(242,237,227,.12)}

/* ===== 06 标签 ===== */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;font-size:11px;letter-spacing:.14em;line-height:1.6;
  border:1px solid;border-radius:1px;white-space:nowrap;
}
.tag--celadon{color:var(--celadon);border-color:rgba(111,167,155,.55);background:rgba(111,167,155,.1)}
.tag--gold{color:var(--gold);border-color:rgba(232,195,106,.5);background:rgba(232,195,106,.08)}
.tag--cinnabar{color:var(--gold-soft);border-color:rgba(179,58,43,.75);background:rgba(179,58,43,.32)}

/* ===== 07 卡片 ===== */
.card{
  position:relative;
  background:var(--ink-800);
  border:var(--line-soft);
  border-radius:2px;
  padding:clamp(20px,3vw,32px);
  box-shadow:var(--shadow-paper);
}
.card--paper{background:var(--paper);color:var(--ink-900);border-color:rgba(11,26,46,.18)}
.card--paper h2,.card--paper h3{color:var(--ink-900)}

/* ===== 08 图片容器基础规则 ===== */
.media{
  position:relative;overflow:hidden;border-radius:2px;
  border:1px solid rgba(232,195,106,.18);
  background-color:var(--ink-800);
  background-image:
    repeating-linear-gradient(118deg,rgba(232,195,106,.08) 0 1px,transparent 1px 16px),
    linear-gradient(135deg,var(--ink-800) 0%,var(--ink-700) 55%,var(--celadon-deep) 100%);
}
.media img,.media video{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:12px 14px;font-size:11px;letter-spacing:.12em;color:var(--paper);
  background:linear-gradient(0deg,rgba(11,26,46,.92),rgba(11,26,46,0));
}

/* ===== 09 栅格 ===== */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}

/* ===== 10 面包屑 ===== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:12px;letter-spacing:.08em;color:var(--mist);
  padding-top:clamp(20px,3vw,32px);
}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li+li::before{content:"/";margin:0 8px 0 0;color:rgba(154,167,184,.5)}
.breadcrumb-link{color:var(--mist);text-decoration:none;transition:color .2s var(--ease)}
.breadcrumb-link:hover{color:var(--gold)}

/* ===== 11 页头：左侧轨道 ===== */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 16px;background:var(--gold);color:var(--ink-900);
  font-size:13px;font-weight:700;letter-spacing:.1em;text-decoration:none;
  border-radius:2px;transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.site-header{
  position:fixed;inset:0 auto 0 0;z-index:100;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  padding:26px 22px 22px;
  color:var(--paper);
  background:linear-gradient(180deg,#0E2138 0%,#0B1A2E 48%,#081525 100%);
  border-right:var(--line);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:190px;
  pointer-events:none;opacity:.7;
  background-image:repeating-linear-gradient(180deg,rgba(111,167,155,.16) 0 1px,transparent 1px 15px);
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 78%);
  mask-image:linear-gradient(180deg,transparent,#000 78%);
}
.header-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%}

.brand{
  display:flex;align-items:center;gap:12px;
  padding-bottom:20px;width:100%;
  text-decoration:none;color:var(--paper);
  border-bottom:var(--line);
}
.brand-mark{
  position:relative;flex:0 0 42px;width:42px;height:42px;
  display:grid;place-items:center;
  font-family:var(--font-display);font-size:22px;font-weight:900;color:var(--gold);
  border:1px solid rgba(232,195,106,.55);background:rgba(232,195,106,.06);
  transform:rotate(-4deg);
}
.brand-mark::after{content:"";position:absolute;right:-4px;bottom:-4px;width:8px;height:8px;background:var(--cinnabar)}
.brand-text{display:flex;flex-direction:column;gap:5px;min-width:0}
.brand-name{font-family:var(--font-display);font-size:21px;font-weight:900;letter-spacing:.05em;line-height:1}
.brand-sub{font-size:10px;letter-spacing:.26em;color:var(--gold);opacity:.82;text-transform:uppercase}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;border:1px solid rgba(232,195,106,.45);border-radius:2px;
  color:var(--gold);font-size:12px;letter-spacing:.16em;cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(232,195,106,.1);border-color:var(--gold)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:center;gap:3px;width:16px}
.nav-toggle-bars span{display:block;height:1.5px;background:currentColor;transition:transform .24s var(--ease),opacity .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}
.nav-toggle-label{display:inline-block}

.site-nav{
  display:flex;flex-direction:column;
  margin-top:26px;flex:1 1 auto;min-height:0;
  overflow-y:auto;
}
.nav-annotation{
  font-size:10px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--mist);margin-bottom:14px;
}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-item{display:block}
.nav-link{
  display:flex;align-items:baseline;gap:12px;
  padding:11px 10px 11px 12px;
  border-left:2px solid transparent;border-radius:0 2px 2px 0;
  text-decoration:none;color:var(--paper);
  transition:background .24s var(--ease),border-color .24s var(--ease),color .24s var(--ease);
}
.nav-index{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--gold);opacity:.6}
.nav-label{font-size:15px;letter-spacing:.08em}
.nav-link:hover,.nav-link:focus-visible{background:rgba(232,195,106,.07);border-left-color:var(--gold-soft);color:var(--gold-soft)}
.nav-link[aria-current="page"]{
  background:linear-gradient(90deg,rgba(232,195,106,.18),rgba(232,195,106,0));
  border-left-color:var(--gold);color:var(--gold-soft);font-weight:700;
}
.nav-link[aria-current="page"] .nav-index{opacity:1}
.nav-link.is-active .nav-label::after{
  content:"";display:inline-block;width:5px;height:5px;margin-left:9px;
  border-radius:50%;background:var(--celadon);vertical-align:middle;
}
.nav-foot{
  margin-top:auto;padding-top:20px;border-top:var(--line);
  display:flex;flex-direction:column;gap:12px;
}
.nav-utility{
  display:inline-flex;align-items:center;justify-content:space-between;gap:10px;
  padding:11px 14px;background:var(--cinnabar);color:var(--paper);
  font-size:14px;font-weight:700;letter-spacing:.12em;text-decoration:none;border-radius:2px;
  transition:background .22s var(--ease);
}
.nav-utility::after{content:"→";font-family:var(--font-mono);font-size:12px}
.nav-utility:hover{background:#C74331}
.nav-note{font-size:11px;line-height:1.8;letter-spacing:.04em;color:var(--mist);word-break:break-all}

/* ===== 12 主体偏移 ===== */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ===== 13 移动端抽屉 ===== */
@media (max-width:1023px){
  body{padding-top:var(--header-h)}
  body.nav-locked{overflow:hidden}

  .site-header{
    inset:0 0 auto 0;width:100%;min-height:var(--header-h);
    flex-direction:row;align-items:center;
    padding:12px var(--gutter);
    border-right:0;border-bottom:var(--line);
    background:linear-gradient(180deg,#0E2138,#0B1A2E);
  }
  .site-header::after{display:none}

  .brand{padding-bottom:0;border-bottom:0;width:auto;gap:10px}
  .brand-mark{flex-basis:34px;width:34px;height:34px;font-size:18px}
  .brand-name{font-size:17px}
  .brand-sub{font-size:9px;letter-spacing:.2em}

  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);bottom:0;z-index:99;
    margin:0;padding:22px var(--gutter) calc(24px + env(safe-area-inset-bottom));
    background:linear-gradient(180deg,#0B1A2E 0%,#0A1B31 55%,#071322 100%);
    border-top:var(--line-soft);
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s linear;
  }
  .site-header[data-open="true"] .site-nav{
    opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0);
  }
  .nav-annotation{margin-bottom:10px}
  .nav-link{padding:15px 12px;border-left-width:3px}
  .nav-label{font-size:17px}
  .nav-index{font-size:12px}
  .nav-foot{margin-top:auto;padding-top:22px}
  .nav-note{font-size:12px}
  .nav-utility{padding:14px 16px;font-size:15px}
}

/* ===== 14 页脚 ===== */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,7vw,96px);
  color:var(--paper);
  background:linear-gradient(180deg,#0B1A2E 0%,#0E2138 58%,#091425 100%);
  border-top:var(--line);
}
.footer-wave{
  position:absolute;left:0;right:0;bottom:0;height:150px;
  pointer-events:none;opacity:.55;
  background-image:repeating-linear-gradient(180deg,rgba(111,167,155,.18) 0 1px,transparent 1px 20px);
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 72%);
  mask-image:linear-gradient(180deg,transparent,#000 72%);
}
.footer-inner{
  position:relative;z-index:1;
  max-width:var(--measure);margin-inline:auto;
  padding:clamp(36px,6vw,64px) var(--gutter) 28px;
}
.footer-top{display:grid;grid-template-columns:1fr;gap:clamp(24px,4vw,40px)}
.footer-brand{display:flex;align-items:flex-start;gap:14px}
.footer-seal{
  flex:0 0 56px;width:56px;height:56px;
  display:grid;place-items:center;
  writing-mode:vertical-rl;letter-spacing:.1em;
  font-family:var(--font-display);font-size:18px;font-weight:900;line-height:1;
  color:var(--paper);background:var(--cinnabar);
  border-radius:2px;transform:rotate(-3deg);
  box-shadow:0 10px 24px -14px rgba(179,58,43,.95);
}
.footer-brand-name{font-family:var(--font-display);font-size:19px;font-weight:900;letter-spacing:.08em}
.footer-brand-note{margin-top:8px;max-width:26ch;font-size:12.5px;line-height:1.85;color:var(--mist)}
.footer-col-title{
  margin-bottom:14px;font-size:11px;font-weight:700;
  letter-spacing:.24em;color:var(--gold);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  font-size:14px;letter-spacing:.04em;text-decoration:none;
  color:rgba(242,237,227,.86);
  transition:color .2s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--gold)}
.footer-contact{display:flex;flex-direction:column;gap:12px}
.footer-contact-item{display:flex;flex-direction:column;gap:3px}
.footer-contact-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--celadon)}
.footer-contact-val{font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;color:var(--paper);word-break:break-all}
.footer-contact-val--text{font-family:var(--font-body);font-size:13px;line-height:1.75;color:rgba(242,237,227,.86)}
.footer-legal{
  margin-top:clamp(28px,4vw,44px);padding-top:18px;
  border-top:var(--line);
  display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;
}
.footer-legal-line{font-size:12px;letter-spacing:.04em;color:var(--mist)}

@media (min-width:640px){
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .footer-top{grid-template-columns:1.5fr .9fr .9fr 1.3fr}
}

/* ===== 15 阅读进度 / 显现 ===== */
.read-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:150;
  background:rgba(232,195,106,.12);pointer-events:none;
}
.read-progress span{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--cinnabar));
}
@media (min-width:1024px){
  .read-progress{left:var(--rail-w)}
}

.js-reveal [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* ===== 16 减少动效 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-reveal [data-reveal]{opacity:1;transform:none}
  .read-progress span{transition:none}
  .site-nav{transition:none}
}