/* =========================================================
   千果CN · 共享样式表 /assets/site.css
   框架式导航 + 堆叠面板 + 控制台状态隐喻
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root{
  --orange:#F26A2E;
  --orange-deep:#B8421A;
  --lime:#A8D82E;
  --sand:#F4E7D3;
  --charcoal:#232323;
  --snow:#FCFBF7;
  --cyan:#00C2A8;
  --violet:#6B4EFF;
  --grey:#D9D4CC;
  --green-deep:#4F6B1E;

  --ink:var(--charcoal);
  --ink-soft:rgba(35,35,35,.74);
  --ink-mute:rgba(35,35,35,.52);
  --paper:var(--snow);
  --on-dark:rgba(252,251,247,.78);
  --hairline:rgba(35,35,35,.14);
  --hairline-strong:rgba(35,35,35,.3);
  --hairline-dark:rgba(252,251,247,.16);

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",SFMono-Regular,Consolas,"Liberation Mono",monospace;

  --frame-w:1280px;
  --gutter:clamp(1.25rem,4vw,2.5rem);
  --radius:4px;
  --shadow-micro:0 1px 0 rgba(35,35,35,.03),0 10px 30px -22px rgba(35,35,35,.5);
  --shadow-lift:0 2px 0 rgba(35,35,35,.05),0 24px 48px -30px rgba(35,35,35,.6);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 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,blockquote,dl,dd{margin:0;padding:0}

ul,ol{list-style:none}

img,svg,video{display:block;max-width:100%;height:auto}

a{color:inherit;text-decoration:none}

button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}

table{border-collapse:collapse;width:100%}

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

/* ---------- 3. 中文排版与页面底色 ---------- */
body{
  font-family:var(--font-body);
  font-size:clamp(1rem,.95rem + .18vw,1.0625rem);
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.14;
  letter-spacing:-.012em;
  color:var(--charcoal);
}

h1{font-size:clamp(2.4rem,5vw,4.6rem)}
h2{font-size:clamp(1.6rem,3vw,2.5rem)}
h3{font-size:clamp(1.15rem,1.8vw,1.45rem)}
h4{font-size:1.0625rem;line-height:1.4}

p{color:var(--ink-soft)}

strong{font-weight:900;color:var(--charcoal)}

::selection{background:var(--lime);color:var(--charcoal)}

#main-content{display:block;scroll-margin-top:130px}

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

.grid{display:grid;gap:clamp(1rem,2.4vw,1.75rem)}
.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))}

.prose{max-width:68ch}
.prose > * + *{margin-top:1.1em}
.prose h2{margin-top:2em}
.prose h3{margin-top:1.6em}
.prose ul,
.prose ol{list-style:disc;padding-left:1.35rem}
.prose li + li{margin-top:.4rem}
.prose ol{list-style:decimal}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--orange-deep);
}
.eyebrow::before{
  content:"";
  width:20px;
  height:2px;
  background:var(--orange);
  flex:0 0 auto;
}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.82rem 1.4rem;
  border:1px solid transparent;
  border-radius:3px;
  font-family:var(--font-body);
  font-size:.9375rem;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  transition:background-color .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--solid{background:var(--orange);color:#fff}
.btn--solid:hover{background:var(--orange-deep);box-shadow:var(--shadow-micro)}
.btn--ink{background:var(--charcoal);color:var(--snow)}
.btn--ink:hover{background:var(--orange);color:#fff}
.btn--ghost{border-color:var(--hairline-strong);color:var(--charcoal)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--orange-deep);background:rgba(0,194,168,.07)}

/* ---------- 6. 堆叠面板 ---------- */
.panel{
  position:relative;
  background:var(--snow);
  border:1px solid var(--hairline);
  border-radius:var(--radius);
  box-shadow:var(--shadow-micro);
  padding:clamp(1.4rem,3vw,2.5rem);
}
.panel--sand{background:var(--sand);border-color:rgba(35,35,35,.1)}
.panel--ink{
  background:var(--charcoal);
  border-color:var(--hairline-dark);
  color:var(--on-dark);
}
.panel--ink h1,
.panel--ink h2,
.panel--ink h3,
.panel--ink h4,
.panel--ink strong{color:var(--snow)}
.panel--ink p{color:var(--on-dark)}

.panel__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:.75rem 1.5rem;
  padding-bottom:1rem;
  margin-bottom:1.25rem;
  border-bottom:1px solid var(--hairline);
}
.panel--ink .panel__head{border-bottom-color:var(--hairline-dark)}

.panel__title{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.15rem,1.9vw,1.4rem);
}

/* ---------- 7. 图片容器基础规则 ---------- */
.frame-media{
  position:relative;
  overflow:hidden;
  background:var(--sand);
  border:1px solid var(--hairline);
  border-radius:var(--radius);
  box-shadow:var(--shadow-micro);
}
.frame-media > img{
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .5s var(--ease);
}
.frame-media:hover > img{transform:scale(1.025)}
.frame-media--16x9{aspect-ratio:16 / 9}
.frame-media--4x3{aspect-ratio:4 / 3}
.frame-media--3x4{aspect-ratio:3 / 4}
.frame-media--1x1{aspect-ratio:1 / 1}
.frame-media__tag{
  position:absolute;
  left:0;
  bottom:0;
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.4rem .8rem;
  background:rgba(35,35,35,.86);
  color:var(--snow);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
}

/* ---------- 8. 索引表与面包屑 ---------- */
.index-list li{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:.35rem 1.25rem;
  padding:.85rem 0;
  border-bottom:1px solid var(--hairline);
  transition:background-color .18s var(--ease),padding-inline .18s var(--ease);
}
.index-list li:hover{
  background:rgba(244,231,211,.6);
  padding-inline:.6rem;
}
.index-list li:last-child{border-bottom:0}

.breadcrumbs{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.08em;
  color:var(--ink-mute);
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center}
.breadcrumbs li{display:inline-flex;align-items:center}
.breadcrumbs li::after{
  content:"/";
  margin:0 .6rem;
  color:var(--grey);
}
.breadcrumbs li:last-child::after{content:"";margin:0}
.breadcrumbs a{transition:color .2s var(--ease)}
.breadcrumbs a:hover{color:var(--orange-deep)}

/* ---------- 9. 跳过链接 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-120px;
  z-index:200;
  padding:.7rem 1.1rem;
  background:var(--orange);
  color:#fff;
  font-weight:700;
  font-size:.875rem;
  border-radius:3px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:.85rem}

/* ---------- 10. 页头：框架式导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--snow);
}

.header-rail{
  background:var(--charcoal);
  color:var(--on-dark);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  text-transform:uppercase;
}
.header-rail__inner{
  width:min(100% - (var(--gutter) * 2),var(--frame-w));
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:clamp(.75rem,3vw,1.75rem);
  min-height:34px;
}
.rail-item{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  white-space:nowrap;
  color:inherit;
}
.rail-item--live{margin-right:auto;color:rgba(252,251,247,.9)}
.rail-item--mono{color:rgba(252,251,247,.66)}

.rail-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(0,194,168,.22);
  animation:rail-pulse 2.6s var(--ease) infinite;
  flex:0 0 auto;
}
@keyframes rail-pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(0,194,168,.22)}
  50%{box-shadow:0 0 0 7px rgba(0,194,168,.05)}
}

.header-frame{
  position:relative;
  background:var(--snow);
  border-bottom:1px solid var(--hairline);
  box-shadow:0 1px 0 rgba(35,35,35,.03),0 14px 30px -30px rgba(35,35,35,.7);
}
.header-frame__inner{
  width:min(100% - (var(--gutter) * 2),var(--frame-w));
  margin-inline:auto;
  display:flex;
  align-items:center;
  gap:clamp(.75rem,2vw,1.75rem);
  min-height:78px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:.75rem;
  flex:0 0 auto;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  border-radius:3px;
  background:var(--orange);
  color:#fff;
  font-family:var(--font-head);
  font-weight:900;
  font-size:1.3rem;
  line-height:1;
  box-shadow:inset 0 -3px 0 rgba(0,0,0,.18);
  transition:background-color .2s var(--ease);
}
.brand:hover .brand__mark{background:var(--orange-deep)}
.brand__text{display:block}
.brand__name{
  display:block;
  font-family:var(--font-head);
  font-weight:900;
  font-size:1.0625rem;
  line-height:1.2;
  letter-spacing:.02em;
}
.brand__sub{
  display:block;
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.14em;
  color:var(--ink-mute);
}

.site-nav{margin-left:auto}
.site-nav__list{
  counter-reset:navidx;
  display:flex;
  align-items:stretch;
}
.site-nav__item{display:flex}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:.55rem clamp(.55rem,1.05vw,1rem);
  border-left:1px solid var(--hairline);
  font-size:.9375rem;
  font-weight:500;
  color:var(--ink-soft);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.site-nav__item:last-child .site-nav__link{border-right:1px solid var(--hairline)}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:clamp(.55rem,1.05vw,1rem);
  right:clamp(.55rem,1.05vw,1rem);
  bottom:.34rem;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .24s var(--ease),background-color .24s var(--ease);
}
.site-nav__link:hover{color:var(--orange-deep);background:rgba(244,231,211,.55)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--charcoal);background:var(--sand)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--charcoal)}

.header-cta{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  flex:0 0 auto;
  padding:.65rem 1.15rem;
  border-radius:3px;
  background:var(--charcoal);
  color:var(--snow);
  font-size:.875rem;
  font-weight:700;
  letter-spacing:.02em;
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.header-cta::after{
  content:"→";
  font-family:var(--font-mono);
  transition:transform .2s var(--ease);
}
.header-cta:hover{background:var(--orange);color:#fff}
.header-cta:hover::after{transform:translateX(3px)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.6rem;
  flex:0 0 auto;
  padding:.55rem .75rem;
  border:1px solid var(--hairline-strong);
  border-radius:3px;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.14em;
  color:var(--charcoal);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--orange-deep)}
.nav-toggle__bars{display:grid;gap:4px;width:20px}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  margin-top:clamp(3rem,7vw,6rem);
  background:var(--charcoal);
  color:var(--on-dark);
  border-top:3px solid var(--orange);
}
.footer-top{
  width:min(100% - (var(--gutter) * 2),var(--frame-w));
  margin-inline:auto;
  padding:clamp(2.5rem,5vw,4rem) 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.35fr;
  gap:clamp(1.75rem,3.5vw,3rem);
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:400;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--lime);
  margin-bottom:1rem;
}

.footer-brand{
  display:inline-flex;
  align-items:center;
  gap:.65rem;
  margin-bottom:1rem;
}
.footer-brand__mark{
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  border-radius:3px;
  background:var(--orange);
  color:#fff;
  font-family:var(--font-head);
  font-weight:900;
  font-size:1.1rem;
  line-height:1;
}
.footer-brand__name{
  font-family:var(--font-head);
  font-weight:900;
  font-size:1.1rem;
  color:var(--snow);
  letter-spacing:.02em;
}
.footer-text{
  font-size:.9375rem;
  line-height:1.7;
  color:var(--on-dark);
  max-width:36ch;
}
.footer-tags{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem;
  margin-top:1.1rem;
}
.footer-tags li{
  padding:.2rem .6rem;
  border:1px solid var(--hairline-dark);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.12em;
  color:rgba(252,251,247,.72);
}

.footer-links li + li{margin-top:.5rem}
.footer-link{
  position:relative;
  display:inline-block;
  padding-bottom:2px;
  font-size:.9375rem;
  color:var(--on-dark);
  transition:color .2s var(--ease);
}
.footer-link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:1px;
  background:var(--lime);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .24s var(--ease);
}
.footer-link:hover{color:var(--snow)}
.footer-link:hover::after{transform:scaleX(1)}

.footer-contact{display:grid;gap:.85rem}
.footer-contact__row{display:grid;gap:.15rem}
.footer-contact__row dt{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  color:rgba(252,251,247,.5);
}
.footer-contact__row dd{
  font-size:.9375rem;
  line-height:1.55;
  color:var(--snow);
  overflow-wrap:anywhere;
}
.footer-note{
  margin-top:1rem;
  font-size:.8125rem;
  line-height:1.65;
  color:rgba(252,251,247,.55);
}

.footer-base{border-top:1px solid var(--hairline-dark)}
.footer-base__inner{
  width:min(100% - (var(--gutter) * 2),var(--frame-w));
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.5rem 1.5rem;
  padding:1.1rem 0;
}
.footer-base__item{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:rgba(252,251,247,.6);
}

/* ---------- 12. 滚动进度条 ---------- */
.scroll-progress{
  position:fixed;
  left:0;
  top:0;
  width:100%;
  height:3px;
  z-index:120;
  pointer-events:none;
  background:rgba(35,35,35,.08);
}
.scroll-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--orange) 0%,var(--lime) 55%,var(--cyan) 100%);
}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1180px){
  .header-cta{display:none}
}

@media (max-width:1080px){
  .nav-toggle{display:inline-flex;margin-left:auto}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    margin-left:0;
    display:none;
    background:var(--snow);
    border-top:1px solid var(--hairline);
    border-bottom:1px solid var(--hairline);
    box-shadow:0 30px 50px -34px rgba(35,35,35,.75);
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{display:block;padding:.4rem 0 .8rem}
  .site-nav__item{display:block}
  .site-nav__link{
    width:100%;
    justify-content:flex-start;
    gap:.85rem;
    padding:.9rem var(--gutter);
    border-left:0;
    border-right:0;
    border-bottom:1px solid var(--hairline);
    font-size:1rem;
  }
  .site-nav__item:last-child .site-nav__link{border-bottom:0}
  .site-nav__link::before{
    content:counter(navidx,decimal-leading-zero);
    counter-increment:navidx;
    font-family:var(--font-mono);
    font-size:.6875rem;
    letter-spacing:.1em;
    color:var(--ink-mute);
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--orange)}
}

@media (max-width:900px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3,
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:720px){
  .rail-hide-sm{display:none}
  .brand__sub{display:none}
  .header-frame__inner{min-height:66px}
  .grid--2,
  .grid--3,
  .grid--4{grid-template-columns:1fr}
}

@media (max-width:620px){
  .footer-grid{grid-template-columns:1fr}
  .footer-base__inner{flex-direction:column;align-items:flex-start}
  .header-rail__inner{min-height:30px}
}

/* ---------- 14. 减少动态偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .frame-media:hover > img{transform:none}
}