/* ==========================================================================
   鸭脖系服务 · 共享站点样式 /assets/site.css
   双轨货架 · 切角面板 · 暖色工坊
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::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}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 变量 ---------- */
:root{
  --brown:#3B2118;
  --chili:#C5332D;
  --orange:#E77A2E;
  --greyblue:#607D86;
  --bone:#FBF5EC;
  --malt:#E9D4B8;
  --charcoal:#1B1512;
  --amber:#B97A2C;
  --paper:#F3E8D8;
  --steel:#8FA2A5;

  --ink:var(--charcoal);
  --ink-soft:rgba(27,21,18,.72);
  --line:rgba(59,33,24,.14);
  --line-strong:rgba(59,33,24,.3);
  --on-dark:rgba(251,245,236,.84);

  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:var(--font-head);
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"PingFang SC",monospace;

  --radius-l:22px;
  --radius-m:14px;
  --radius-s:8px;
  --cut:14px;
  --w-max:1240px;
  --w-narrow:760px;
  --shadow-soft:0 18px 44px -30px rgba(59,33,24,.75);
  --shadow-lift:0 22px 50px -32px rgba(27,21,18,.9);
  --strip-h:50px;
  --dur:190ms;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--charcoal);
  background-color:var(--bone);
  background-image:
    radial-gradient(120% 80% at 100% 0, rgba(233,212,184,.5), transparent 58%),
    radial-gradient(90% 70% at 0 100%, rgba(96,125,134,.07), transparent 60%);
  background-repeat:no-repeat;
  padding-bottom:var(--strip-h);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:900;
  line-height:1.12;
  letter-spacing:-.012em;
  color:var(--brown);
}
h1{font-size:clamp(2rem,4.6vw,3.4rem)}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem)}
h3{font-size:clamp(1.12rem,1.6vw,1.35rem);letter-spacing:0}
h4{font-size:1rem;letter-spacing:.01em}
p{max-width:74ch}
strong{font-weight:800;color:var(--brown)}
small{font-size:.82rem}
::selection{background:var(--orange);color:#fff}

a{transition:color var(--dur) var(--ease)}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:6px}

/* ---------- 4. 容器与章节 ---------- */
.container{width:min(100% - 2.4rem,var(--w-max));margin-inline:auto}
.container-narrow{width:min(100% - 2.4rem,var(--w-narrow));margin-inline:auto}

.section{padding-block:clamp(2.6rem,6vw,5rem);position:relative}
.section--malt{background:var(--malt)}
.section--paper{background:var(--paper)}
.section--brown{background:var(--brown);color:var(--on-dark)}
.section--brown h1,.section--brown h2,.section--brown h3,.section--brown h4{color:var(--bone)}
.section--brown .eyebrow{color:var(--malt)}
.section--brown strong{color:#fff}

/* ---------- 5. 通用标签 / 按钮 / 卡片 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--greyblue);
}
.eyebrow::before{content:"";width:24px;height:2px;background:var(--orange)}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
  padding:.2rem .55rem;border-radius:4px;
  background:var(--paper);color:var(--brown);border:1px solid var(--line);
  white-space:nowrap;
}
.tag--chili{background:rgba(197,51,45,.1);color:var(--chili);border-color:rgba(197,51,45,.26)}
.tag--chain{background:rgba(96,125,134,.12);color:var(--greyblue);border-color:rgba(96,125,134,.3)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.72rem 1.3rem;border-radius:999px;border:1px solid transparent;
  font-weight:700;font-size:.94rem;line-height:1.2;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn--primary{background:var(--chili);color:#fff}
.btn--primary:hover{background:#a9261f}
.btn--ghost{background:rgba(251,245,236,.7);border-color:var(--line-strong);color:var(--brown)}
.btn--ghost:hover{border-color:var(--brown);background:var(--malt)}
.btn--mono{font-family:var(--font-mono);letter-spacing:.1em;font-size:.76rem;text-transform:uppercase}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-m);
  padding:clamp(1rem,2vw,1.5rem);
  transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.card:hover{border-color:rgba(197,51,45,.55);box-shadow:var(--shadow-soft)}

.grid{display:grid;gap:clamp(1rem,2.2vw,1.75rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(270px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid--split{grid-template-columns:1fr}
@media (min-width:900px){
  .grid--split{grid-template-columns:1.18fr .82fr}
  .grid--split--rev{grid-template-columns:.82fr 1.18fr}
}

/* ---------- 6. 图形语言 ---------- */
.cut-panel{
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.diagonal-rule{
  height:2px;border:0;width:100%;
  background:linear-gradient(90deg,var(--chili),var(--orange) 42%,rgba(96,125,134,.55) 100%);
  transform-origin:left center;
}

/* 图片容器基础规则（页面阶段放图） */
.media-frame{
  position:relative;overflow:hidden;border-radius:var(--radius-m);
  aspect-ratio:4/3;
  background:
    radial-gradient(90% 90% at 15% 10%, rgba(233,212,184,.95), transparent 60%),
    linear-gradient(145deg,var(--malt),var(--paper) 55%,rgba(231,122,46,.3));
  border:1px solid rgba(59,33,24,.1);
}
.media-frame img{width:100%;height:100%;object-fit:cover;object-position:center}
.media-frame[data-ratio="16:9"]{aspect-ratio:16/9}
.media-frame[data-ratio="4:3"]{aspect-ratio:4/3}
.media-frame[data-ratio="1:1"]{aspect-ratio:1/1}
.media-frame[data-ratio="3:4"]{aspect-ratio:3/4}
.media-frame > figcaption{
  position:absolute;left:0;bottom:0;right:0;
  padding:.7rem .9rem;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.07em;
  color:var(--bone);
  background:linear-gradient(to top,rgba(27,21,18,.82),rgba(27,21,18,0));
}

/* ---------- 7. 面包屑与正文 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;
  color:var(--greyblue);
}
.breadcrumb a{color:var(--greyblue)}
.breadcrumb a:hover{color:var(--chili)}
.breadcrumb .sep{color:var(--steel)}

.prose{max-width:72ch;color:var(--ink);font-size:1rem}
.prose p + p{margin-top:1em}
.prose h2{margin-top:2.2em;margin-bottom:.6em}
.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose ul,.prose ol{margin-block:1em;padding-left:1.2rem;list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.35em}
.prose a{color:var(--chili);text-decoration:underline;text-underline-offset:3px}

/* ---------- 8. 跳过链接 ---------- */
.skip-link{
  position:fixed;left:12px;top:-120px;z-index:300;
  padding:.62rem 1.1rem;border-radius:0 0 var(--radius-s) var(--radius-s);
  background:var(--chili);color:#fff;font-weight:700;font-size:.9rem;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 9. 顶部公告带 ---------- */
.notice-bar{
  background:var(--charcoal);color:rgba(251,245,236,.82);
  overflow:hidden;border-bottom:1px solid rgba(233,212,184,.16);
}
.notice-track{
  display:flex;width:max-content;
  animation:notice-scroll 46s linear infinite;
}
.notice-bar:hover .notice-track,
.notice-bar:focus-within .notice-track{animation-play-state:paused}
.notice-group{display:flex;align-items:center;gap:2.2rem;padding-right:2.2rem}
.notice-item{
  display:inline-flex;align-items:center;gap:.45rem;
  padding-block:.42rem;white-space:nowrap;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.07em;
}
.notice-key{
  display:inline-block;padding:.05rem .38rem;border-radius:3px;
  background:rgba(231,122,46,.2);color:var(--orange);
  font-size:.66rem;letter-spacing:.12em;
}
@keyframes notice-scroll{
  from{transform:translateX(0)}
  to{transform:translateX(-50%)}
}

/* ---------- 10. 悬浮胶囊导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:120;
  padding:14px clamp(.8rem,3vw,1.75rem) 10px;
  transition:padding var(--dur) var(--ease);
}
.nav-shell{
  position:relative;
  width:min(100%,var(--w-max));margin-inline:auto;
  display:flex;align-items:center;gap:1rem;
  padding:9px 12px 9px 14px;
  border-radius:999px;
  background:rgba(251,245,236,.94);
  border:1px solid rgba(59,33,24,.16);
  box-shadow:0 12px 34px -24px rgba(59,33,24,.9);
  backdrop-filter:blur(10px);
  transition:padding var(--dur) var(--ease),background-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.site-header[data-compact="true"]{padding-block:6px}
.site-header[data-compact="true"] .nav-shell{
  padding-block:6px;
  background:rgba(251,245,236,.99);
  box-shadow:0 14px 30px -22px rgba(59,33,24,1);
}

.brand{display:inline-flex;align-items:center;gap:.6rem;flex:0 0 auto}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;flex:0 0 34px;
  background:var(--chili);color:#fff;
  font-weight:900;font-size:1rem;line-height:1;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-weight:900;font-size:1rem;letter-spacing:-.01em;color:var(--brown)}
.brand-sub{
  font-family:var(--font-mono);font-size:.62rem;letter-spacing:.14em;
  color:var(--greyblue);text-transform:uppercase;
}

.nav-toggle{
  display:none;align-items:center;gap:.5rem;margin-left:auto;
  padding:.5rem .8rem;border-radius:999px;
  border:1px solid var(--line-strong);background:rgba(233,212,184,.4);
  color:var(--brown);font-weight:700;font-size:.82rem;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--chili);background:var(--malt)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:space-between;width:16px;height:12px}
.nav-toggle-bars span{display:block;height:2px;width:100%;background:var(--brown);border-radius:2px;transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(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(-5px) rotate(-45deg)}
.nav-toggle-text{font-family:var(--font-mono);letter-spacing:.08em;font-size:.72rem}

.site-nav{display:flex;align-items:center;gap:.35rem;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  position:relative;display:block;padding:8px 11px;border-radius:999px;
  font-size:13.5px;font-weight:500;letter-spacing:.01em;color:var(--brown);
  white-space:nowrap;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:11px;right:11px;bottom:4px;height:2px;
  background:var(--orange);transform:scaleX(0);transform-origin:left;
  transition:transform var(--dur) var(--ease);
}
.nav-link:hover{background:rgba(233,212,184,.55)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{background:var(--chili);color:#fff;font-weight:700}
.nav-link[aria-current="page"]::after{display:none}

.nav-tracks{display:none}

.nav-cta{
  display:inline-flex;align-items:center;gap:.4rem;margin-left:.5rem;
  padding:9px 16px;border-radius:999px;
  background:var(--brown);color:var(--bone);
  border:1px solid var(--brown);
  font-weight:700;font-size:13.5px;letter-spacing:.02em;white-space:nowrap;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-cta:hover{background:var(--chili);border-color:var(--chili);color:#fff}
.nav-cta-arrow{font-family:var(--font-mono);transition:transform var(--dur) var(--ease)}
.nav-cta:hover .nav-cta-arrow{transform:translateX(3px)}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--brown);color:var(--on-dark);
  margin-top:auto;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(62% 78% at 92% 0, rgba(231,122,46,.24), transparent 62%),
    radial-gradient(52% 70% at 0 100%, rgba(197,51,45,.22), transparent 64%);
}
.footer-grid{
  position:relative;display:grid;grid-template-columns:1.45fr 1fr 1.25fr 1fr;
  gap:clamp(1.6rem,3vw,3rem);
  padding-block:clamp(2.4rem,5vw,4rem) clamp(2rem,4vw,3.2rem);
}
.footer-col{min-width:0}
.footer-col--brand{max-width:34ch}

.footer-brand-name{
  display:inline-block;
  font-family:var(--font-head);font-weight:900;font-size:1.45rem;line-height:1.1;
  letter-spacing:-.015em;color:var(--bone);
}
.footer-brand-name:hover{color:var(--orange)}
.footer-brand-note{margin-top:.85rem;font-size:.9rem;line-height:1.75;color:rgba(251,245,236,.72);max-width:32ch}
.footer-brand-meta{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:1.1rem}
.footer-badge{
  display:inline-flex;align-items:center;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;
  padding:.22rem .6rem;border-radius:3px;
  border:1px solid rgba(233,212,184,.4);color:var(--malt);
}
.footer-badge--chili{border-color:rgba(231,122,46,.6);color:var(--orange)}

.footer-heading{
  font-family:var(--font-mono);font-weight:600;
  font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--amber);
  padding-bottom:.6rem;margin-bottom:.9rem;
  border-bottom:1px solid rgba(233,212,184,.22);
  position:relative;
}
.footer-heading::after{
  content:"";position:absolute;left:0;bottom:-1px;width:34px;height:2px;background:var(--chili);
}
.footer-list{display:flex;flex-direction:column;gap:.55rem;font-size:.9rem}
.footer-link{
  position:relative;display:inline-block;padding-block:1px;
  color:rgba(251,245,236,.82);
  transition:color var(--dur) var(--ease);
}
.footer-link::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:var(--orange);transition:width var(--dur) var(--ease);
}
.footer-link:hover{color:var(--bone)}
.footer-link:hover::after{width:100%}

.footer-list--contact{gap:.7rem;font-size:.84rem}
.footer-line{display:flex;flex-wrap:wrap;align-items:baseline;gap:.3rem .5rem}
.footer-line--wide{align-items:flex-start;flex-direction:column;gap:.15rem}
.footer-k{
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.14em;
  color:rgba(251,245,236,.5);text-transform:uppercase;flex:0 0 auto;
}
.footer-v{color:rgba(251,245,236,.88);word-break:break-all}
.footer-v--mono{font-family:var(--font-mono);letter-spacing:.02em}

.copy-btn{
  font-family:var(--font-mono);font-size:.62rem;letter-spacing:.12em;
  padding:1px 8px;border-radius:999px;
  border:1px solid rgba(233,212,184,.35);color:rgba(251,245,236,.7);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.copy-btn:hover{border-color:var(--orange);color:var(--orange)}
.copy-btn[data-copied="true"]{background:var(--orange);border-color:var(--orange);color:var(--charcoal)}
.copy-status{
  min-height:1.3em;margin-top:.8rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.05em;color:var(--orange);
}

.footer-strip{
  position:fixed;left:0;right:0;bottom:0;z-index:140;
  height:var(--strip-h);
  background:var(--charcoal);color:rgba(251,245,236,.76);
  border-top:1px solid rgba(233,212,184,.2);
  display:flex;align-items:center;
  padding-inline:clamp(.75rem,3vw,1.75rem);
}
.strip-inner{
  width:min(100%,var(--w-max));margin-inline:auto;
  display:flex;align-items:center;justify-content:space-between;gap:1.25rem;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.05em;
  overflow:hidden;
}
.strip-item{white-space:nowrap}
.strip-item--icp{color:var(--malt)}
.strip-item--copy{color:rgba(251,245,236,.6)}

/* ---------- 12. 返回顶部（site_js 注入） ---------- */
.back-top{
  position:fixed;right:clamp(12px,3vw,28px);bottom:calc(var(--strip-h) + 14px);
  z-index:150;
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.55rem .95rem;border-radius:999px;
  background:var(--brown);color:var(--bone);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;
  box-shadow:var(--shadow-lift);
  opacity:0;transform:translateY(8px);pointer-events:none;
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.back-top[data-visible="true"]{opacity:1;transform:translateY(0);pointer-events:auto}
.back-top:hover{background:var(--chili);color:#fff}

/* ---------- 13. 平板与移动端 ---------- */
@media (max-width:1080px){
  .site-header{padding:10px 12px 8px}
  .nav-shell{border-radius:20px;padding:8px 10px 8px 12px}
  .nav-toggle{display:inline-flex}

  .site-nav{
    display:none;
    position:absolute;top:calc(100% + 10px);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:.75rem;
    margin-left:0;padding:1rem;
    background:rgba(251,245,236,.99);
    border:1px solid var(--line-strong);
    border-radius:18px;
    box-shadow:0 26px 50px -30px rgba(59,33,24,1);
    max-height:calc(100vh - 150px);
    overflow-y:auto;
  }
  .site-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{padding:11px 12px;border-radius:10px;border-bottom:1px dashed rgba(59,33,24,.14);font-size:.95rem}
  .nav-list li:last-child .nav-link{border-bottom:0}
  .nav-link::after{display:none}
  .nav-link:hover{background:var(--malt)}

  .nav-tracks{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
  .track-card{
    display:flex;flex-direction:column;gap:.25rem;
    padding:.7rem .8rem;border-radius:10px;
    background:var(--paper);border:1px solid var(--line);
    clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
    transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
  }
  .track-card:hover{background:var(--malt);border-color:var(--chili)}
  .track-tag{font-family:var(--font-mono);font-size:.62rem;letter-spacing:.14em;color:var(--chili)}
  .track-name{font-size:.8rem;font-weight:700;color:var(--brown);line-height:1.4}
  .nav-cta{justify-content:center;margin-left:0;padding-block:12px}
}

@media (max-width:960px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col--brand{grid-column:1 / -1;max-width:44ch}
}

@media (max-width:720px){
  :root{--strip-h:44px;--cut:11px}
  body{font-size:15.5px}
  .notice-group{gap:1.4rem;padding-right:1.4rem}
  .notice-item{font-size:.66rem}
  .brand-sub{display:none}
  .brand-name{font-size:.95rem}
  .strip-inner{font-size:.64rem;gap:.8rem}
  .strip-item--notice{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-col--brand{grid-column:auto}
  .back-top{bottom:calc(var(--strip-h) + 10px);padding:.5rem .8rem}
}

@media (max-width:420px){
  .nav-tracks{grid-template-columns:1fr}
  .strip-item:first-child{font-size:.6rem}
}

/* ---------- 14. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .notice-track{animation:none;width:100%}
  .notice-group{flex-wrap:wrap;justify-content:center;gap:.4rem 1.2rem;padding-right:0}
  .notice-group[aria-hidden="true"]{display:none}
  .back-top{transform:none}
}