/* ============================================================
   开云赛场 KAIYUN · 共享样式 /assets/site.css
   夜场看台视觉：夜场墨黑底、灯橙光、红土分隔、看台深蓝导轨
   ============================================================ */

:root{
  --ink:#100E0C;
  --ink-2:#1B1815;
  --cream:#F3E7D3;
  --clay:#B8432A;
  --lamp:#FF8A3D;
  --stand:#1D2C4C;
  --turf:#3F7A52;
  --ash:#8A8177;
  --gold:#E8C68A;
  --wood:#5B4A3C;

  --line:rgba(91,74,60,.72);
  --line-soft:rgba(91,74,60,.42);
  --text-soft:rgba(243,231,211,.80);

  --rail-w:88px;
  --wrap:1480px;
  --gutter:clamp(18px,3.4vw,56px);
  --head-top:76px;
  --head-top-min:46px;
  --head-nav:54px;
  --cut:16px;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------------- reset ---------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100%;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  color:var(--cream);
  background-color:var(--ink);
  background-image:
    radial-gradient(80% 55% at 100% 0%, rgba(255,138,61,.16), transparent 62%),
    radial-gradient(62% 44% at 0% 100%, rgba(29,44,76,.55), transparent 72%),
    repeating-linear-gradient(135deg, rgba(243,231,211,.022) 0 2px, transparent 2px 10px);
  background-attachment:fixed,fixed,fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{margin:0 0 .6em;color:inherit;font-weight:900;line-height:1.18;letter-spacing:-.02em}
h1{font-size:clamp(2rem,4vw,3.25rem)}
h2{font-size:clamp(1.5rem,2.6vw,2.15rem)}
h3{font-size:clamp(1.15rem,1.7vw,1.45rem)}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.2em}
a{color:var(--gold);text-underline-offset:3px}
a:hover{color:var(--lamp)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{max-width:100%;display:block}
hr{border:0;border-top:1px solid var(--line);margin:2.4rem 0}
[hidden]{display:none!important}
::selection{background:var(--lamp);color:var(--ink)}

:focus-visible{outline:2px solid var(--lamp);outline-offset:2px}

@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;
  }
}

/* ---------------- 通用工具 ---------------- */
.shell{width:100%;max-width:var(--wrap);margin:0 auto;padding-inline:var(--gutter)}
.shell--rail{padding-left:var(--gutter)}
@media (min-width:1024px){
  .shell--rail{padding-left:calc(var(--rail-w) + var(--gutter))}
}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.prose{max-width:72ch}
.lead{max-width:70ch;font-size:clamp(1.02rem,1.3vw,1.18rem);color:var(--text-soft)}
.muted{color:var(--ash)}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:1.06em;letter-spacing:.01em}
.tilt-title{transform:rotate(-1deg);transform-origin:left center}
.text-vertical{writing-mode:vertical-rl;font-family:var(--font-serif);font-size:.78rem;letter-spacing:.24em;color:var(--ash)}
.divider{height:1px;border:0;background:linear-gradient(90deg,var(--clay),rgba(91,74,60,.35) 40%,transparent);margin:clamp(20px,3vw,36px) 0}

.skip-link{
  position:absolute;left:14px;top:-70px;z-index:200;
  padding:10px 18px;background:var(--lamp);color:var(--ink);
  font-weight:700;text-decoration:none;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:14px;color:var(--ink)}

/* ---------------- 章节节奏 ---------------- */
.section{padding-block:clamp(44px,6.5vw,92px)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:14px 24px;margin-bottom:clamp(20px,3vw,36px)}
.section__title{margin:0}
.section__lead{margin:0;max-width:62ch;color:var(--ash);font-size:.98rem}
.chapter-band{
  display:flex;align-items:center;gap:16px;
  min-height:58px;padding:12px var(--gutter);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(184,67,42,.18),transparent 62%);
}
.chapter-band__num{font-family:var(--font-mono);font-size:.9rem;letter-spacing:.16em;color:var(--clay)}
.chapter-band__name{font-size:.95rem;font-weight:700;letter-spacing:.06em}

/* ---------------- 栅格 ---------------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(18px,2.2vw,32px)}
.grid>*{grid-column:1/-1}
@media (min-width:1024px){
  .grid>*{grid-column:auto}
  .grid--7-5>*:first-child{grid-column:span 7}
  .grid--7-5>*:last-child{grid-column:span 5}
  .grid--8-4>*:first-child{grid-column:span 8}
  .grid--8-4>*:last-child{grid-column:span 4}
  .grid--6-6>*{grid-column:span 6}
}
.stack{display:flex;flex-direction:column;gap:clamp(14px,1.8vw,24px)}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px}

/* ---------------- 面板与卡片 ---------------- */
.panel{
  position:relative;padding:clamp(18px,2.4vw,32px);
  background:var(--ink-2);color:var(--cream);
  border:1px solid var(--line);
}
.panel--cream{background:var(--cream);color:var(--ink);border-color:var(--wood)}
.panel--cream .section__lead,.panel--cream .muted{color:#6b5a4a}
.panel--dark{background:var(--ink-2);color:var(--cream)}
.panel--cut{clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%)}

.card{
  position:relative;padding:18px 20px;
  background:var(--ink-2);border:1px solid var(--line);
  transition:transform .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.card:hover{transform:translateY(-4px);border-color:var(--lamp)}
.card__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:8px}
.card__title{margin:0;font-size:1.05rem;font-weight:700;letter-spacing:0}
.card__meta{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.08em;color:var(--ash)}
.card__body{margin:0;font-size:.95rem;color:var(--text-soft)}
.panel--cream .card{background:#FBF3E6;border-color:rgba(91,74,60,.45);color:var(--ink)}
.panel--cream .card__body{color:#5b4a3c}
.panel--cream .card__meta{color:#8A8177}

.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border:1px solid var(--line);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;
  color:var(--gold);white-space:nowrap;
}
.badge--turf{background:rgba(63,122,82,.18);border-color:var(--turf);color:var(--cream)}
.badge--lamp{background:rgba(255,138,61,.14);border-color:var(--lamp);color:var(--lamp)}

.status-dot{
  display:inline-block;flex:0 0 auto;width:8px;height:8px;border-radius:50%;
  background:var(--turf);box-shadow:0 0 0 3px rgba(63,122,82,.22);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:.5}50%{opacity:1}}

/* ---------------- 媒体容器（页面阶段放图） ---------------- */
.media{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;width:100%;
  background:linear-gradient(140deg,var(--stand) 0%,var(--ink-2) 70%);
  border:1px solid var(--line);
}
.media::before{
  content:"";position:absolute;inset:12px;z-index:0;
  border:1px dashed rgba(243,231,211,.16);
  background-image:
    linear-gradient(90deg, rgba(232,198,138,.22) 0 1px, transparent 1px 100%),
    linear-gradient(0deg, rgba(232,198,138,.22) 0 1px, transparent 1px 100%);
  background-size:25% 100%,100% 25%;
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media>img,.media>picture,.media>picture>img,.media>video{
  position:relative;z-index:1;width:100%;height:100%;object-fit:cover;display:block;
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:12px 14px 10px;
  background:linear-gradient(0deg,rgba(16,14,12,.85),transparent);
  font-family:var(--font-serif);font-size:.78rem;letter-spacing:.06em;color:var(--cream);
}

/* ---------------- 面包屑 ---------------- */
.crumbs{
  display:flex;flex-wrap:wrap;gap:8px;list-style:none;
  margin:0 0 18px;padding:0;
  font-family:var(--font-serif);font-size:.8rem;color:var(--ash);
}
.crumbs__item{display:flex;align-items:center;gap:8px}
.crumbs__link{color:var(--gold);text-decoration:none}
.crumbs__link:hover{color:var(--lamp);text-decoration:underline}
.crumbs__sep{color:var(--wood)}

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-flex;align-items:center;gap:.55em;
  padding:.72em 1.25em;border:1px solid var(--wood);
  background:transparent;color:var(--cream);
  font-family:inherit;font-size:.92rem;font-weight:700;letter-spacing:.04em;line-height:1.2;
  text-decoration:none;white-space:nowrap;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%);
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--lamp{background:var(--lamp);border-color:var(--lamp);color:var(--ink)}
.btn--lamp:hover{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.btn--clay{background:var(--clay);border-color:var(--clay);color:var(--cream)}
.btn--clay:hover{background:var(--lamp);border-color:var(--lamp);color:var(--ink)}
.btn--ghost{background:transparent;border-color:var(--cream);color:var(--cream)}
.btn--ghost:hover{border-color:var(--lamp);color:var(--lamp)}
.btn:focus-visible{outline-offset:2px;box-shadow:inset 0 0 0 2px var(--turf)}

/* ---------------- 左侧看台栏杆导轨 ---------------- */
.rail{
  position:fixed;left:0;top:0;bottom:0;width:var(--rail-w);z-index:40;
  display:none;
  background:linear-gradient(180deg,var(--stand) 0%,#141d31 58%,var(--ink-2) 100%);
  border-right:1px solid var(--line);
}
@media (min-width:1024px){
  .rail{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;padding:140px 0 28px}
}
.rail__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;align-items:center;gap:16px}
.rail__item{margin:0}
.rail__link{
  display:block;writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.14em;
  color:var(--ash);text-decoration:none;
  transition:color .2s var(--ease);
}
.rail__link:hover{color:var(--cream)}
.rail__link[aria-current]{color:var(--lamp)}
.rail__sync{writing-mode:vertical-rl;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;color:var(--gold);margin:0}
.rail__progress{
  position:absolute;left:0;bottom:0;width:100%;height:8px;
  background:var(--clay);transform:scaleX(0);transform-origin:left center;
  transition:transform .2s linear;
}

/* ---------------- 页头 ---------------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(16,14,12,.97);
  border-bottom:1px solid var(--line);
}
.header-top{
  background:linear-gradient(90deg,var(--stand) 0%,#1a2743 46%,var(--ink-2) 100%);
  border-bottom:1px solid var(--line-soft);
}
.header-top__inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);
  min-height:var(--head-top);
  transition:min-height .25s var(--ease);
}
.site-header[data-scrolled] .header-top__inner{min-height:var(--head-top-min)}
.brand{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:var(--cream);flex:0 0 auto}
.brand:hover{color:var(--cream)}
.brand__mark{font-size:1.24rem;font-weight:900;letter-spacing:.04em;transition:font-size .25s var(--ease)}
.site-header[data-scrolled] .brand__mark{font-size:1.02rem}
.brand__latin{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.3em;color:var(--gold)}
.brand__line{
  margin:0;padding-left:14px;border-left:1px solid var(--line-soft);
  font-family:var(--font-serif);font-size:.78rem;letter-spacing:.14em;color:var(--ash);
}
.header-status{
  display:flex;align-items:center;gap:8px;margin:0 0 0 auto;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;color:var(--gold);
}
.header-cta{flex:0 0 auto}

.header-nav{
  position:relative;
  max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);
  display:flex;align-items:center;gap:16px;
}
.site-nav{display:block}
.site-nav__list{display:flex;list-style:none;margin:0;padding:0;gap:clamp(6px,1.6vw,24px)}
.site-nav__item{margin:0}
.site-nav__link{
  display:block;padding:15px 2px;color:var(--cream);
  font-size:.94rem;font-weight:500;letter-spacing:.03em;text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),padding .25s var(--ease);
}
.site-header[data-scrolled] .site-nav__link{padding-block:10px}
.site-nav__link:hover{color:var(--lamp);border-bottom-color:var(--lamp)}
.site-nav__link[aria-current="page"]{color:var(--lamp);border-bottom-color:var(--clay)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 14px;border:1px solid var(--wood);color:var(--cream);
  font-size:.85rem;letter-spacing:.08em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--lamp);color:var(--lamp)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:2px;background:var(--lamp);transition:transform .2s var(--ease)}
.site-header[data-open] .nav-toggle{border-color:var(--lamp);color:var(--lamp)}
.site-header[data-open] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){transform:scaleX(.2);opacity:0}
.site-header[data-open] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.header-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:3px;
  background:linear-gradient(90deg,var(--lamp),var(--clay));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
  pointer-events:none;
}

/* ---------------- 返回顶部 ---------------- */
.to-top{
  position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:90;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;background:var(--stand);border:1px solid var(--wood);color:var(--cream);
  font-size:.82rem;letter-spacing:.08em;
  visibility:hidden;opacity:0;transform:translateY(10px);
  transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s var(--ease),border-color .2s var(--ease);
}
.to-top[data-visible]{visibility:visible;opacity:1;transform:none}
.to-top:hover{border-color:var(--lamp);color:var(--lamp)}
.to-top__arrow{font-family:var(--font-mono);font-size:.95rem}

/* ---------------- 页脚 ---------------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:linear-gradient(180deg,var(--ink-2) 0%,var(--ink) 58%);
  border-top:3px solid var(--clay);
  color:var(--cream);
}
.footer-inner{padding-block:clamp(34px,5vw,64px) clamp(24px,3.4vw,44px)}
.footer-grid{display:grid;grid-template-columns:1fr;gap:clamp(22px,2.6vw,36px)}
@media (min-width:768px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1100px){
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr 1.4fr}
}
.footer-brand__mark{margin:0 0 8px;font-size:1.2rem;font-weight:900;letter-spacing:.03em}
.footer-brand__latin{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.3em;color:var(--gold)}
.footer-brand__line{margin:0 0 14px;font-family:var(--font-serif);font-size:.8rem;letter-spacing:.2em;color:var(--ash)}
.footer-brand__sync{display:flex;align-items:center;gap:8px;margin:0;font-family:var(--font-mono);font-size:.74rem;color:var(--gold)}
.footer-col__title{
  margin:0 0 14px;font-family:var(--font-serif);
  font-size:.8rem;font-weight:700;letter-spacing:.18em;color:var(--cream);
}
.footer-col__list{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.footer-col__link{
  color:var(--text-soft);font-size:.92rem;text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-col__link:hover{color:var(--lamp);border-bottom-color:var(--clay)}
.footer-contact__item{display:flex;gap:10px;margin:0 0 9px;font-size:.85rem;line-height:1.7;color:var(--text-soft)}
.footer-contact__label{flex:0 0 42px;padding-top:2px;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;color:var(--ash)}
.footer-contact__value{word-break:break-all}
.footer-note{
  margin:clamp(22px,3vw,34px) 0 0;padding-top:16px;
  border-top:1px solid var(--line-soft);
  max-width:88ch;font-family:var(--font-serif);font-size:.78rem;letter-spacing:.04em;color:var(--ash);
}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px 26px;margin-top:16px;
  font-family:var(--font-mono);font-size:.74rem;color:var(--ash);
}
.footer-bottom__item{margin:0}

/* ---------------- 移动端：上下与横竖切换 ---------------- */
@media (max-width:900px){
  body{font-size:16px}
  .header-top__inner{flex-wrap:wrap;gap:10px 14px;min-height:auto;padding-block:12px}
  .brand__line{display:none}
  .header-status{margin-left:auto;font-size:.68rem}
  .header-cta{padding:.62em 1em;font-size:.84rem}
  .header-nav{padding-block:0}
  .nav-toggle{display:inline-flex;margin-left:auto}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;padding:8px var(--gutter) 18px;
    background:var(--ink-2);
    border-top:1px solid var(--line-soft);
    border-bottom:1px solid var(--wood);
    box-shadow:0 20px 44px rgba(0,0,0,.6);
  }
  .site-header[data-open] .site-nav{display:block}
  .site-nav__list{flex-direction:column;gap:0}
  .site-nav__item{border-bottom:1px solid var(--line-soft)}
  .site-nav__item:last-child{border-bottom:0}
  .site-nav__link{padding:14px 2px;font-size:1rem;border-bottom:0}
  .site-header[data-scrolled] .site-nav__link{padding-block:14px}
  .footer-bottom{font-size:.7rem}
}