/* ============================================================
   乐竞赛场 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

*,*::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{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg{display:block;max-width:100%;}
img{height:auto;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;cursor:pointer;}
:focus-visible{outline:2px solid var(--c-orange);outline-offset:3px;border-radius:2px;}

:root{
  --c-home:#0E2B22;
  --c-night:#0B1626;
  --c-stand:#123328;
  --c-paper:#F4F1E8;
  --c-lime:#C8F135;
  --c-orange:#FF7A29;
  --c-ink:#0D1114;
  --c-gray:#8A9A93;
  --c-tag:#DFF3C0;
  --c-edge:#2A5A47;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --wrap:1240px;
  --gutter:clamp(18px,4vw,48px);
  --radius:2px;
  --speed:.24s;
}

body{
  background:var(--c-paper);
  color:var(--c-ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5{font-weight:900;line-height:1.05;letter-spacing:-0.02em;}
h1{font-size:clamp(44px,7vw,120px);}
h2{font-size:clamp(28px,4vw,44px);}
h3{font-size:clamp(20px,2.4vw,28px);}
h4{font-size:clamp(17px,1.6vw,20px);}
strong,b{font-weight:800;}

/* ---------- 布局容器 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter);}
.section{position:relative;padding-block:clamp(48px,7vw,96px);}
.section--dark{background:var(--c-home);color:var(--c-paper);}
.section--night{background:var(--c-night);color:var(--c-paper);}
.section--paper{background:var(--c-paper);color:var(--c-ink);}
.section--stand{background:var(--c-stand);color:var(--c-paper);}
.section + .section{border-top:1px solid var(--c-edge);}

.grid{display:grid;gap:clamp(16px,2.4vw,32px);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ---------- 文字与标签 ---------- */
.eyebrow{
  display:inline-block;
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  line-height:1.6;
  color:var(--c-lime);
}
.section--paper .eyebrow{color:var(--c-orange);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid var(--c-lime);
  border-radius:var(--radius);
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  line-height:1.7;
  color:var(--c-lime);
  background:transparent;
  white-space:nowrap;
}
.tag--orange{border-color:var(--c-orange);color:var(--c-orange);}
.tag--paper{border-color:var(--c-ink);color:var(--c-ink);background:var(--c-tag);}

.note{
  font-size:12px;
  line-height:1.7;
  letter-spacing:.16em;
  color:var(--c-gray);
}
.note--vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  letter-spacing:.3em;
}

.prose{max-width:36em;font-size:17px;line-height:1.8;}
.lead{font-size:clamp(17px,1.6vw,20px);line-height:1.75;color:var(--c-gray);}
.section--dark .lead,.section--night .section--stand .lead{color:rgba(244,241,232,.76);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid var(--c-edge);
  border-radius:var(--radius);
  background:transparent;
  color:inherit;
  font-size:14px;
  font-weight:800;
  letter-spacing:.08em;
  line-height:1.2;
  transition:background var(--speed) ease,color var(--speed) ease,border-color var(--speed) ease,transform var(--speed) ease;
}
.btn:hover{transform:translateY(-1px);}
.btn--lime{background:var(--c-lime);border-color:var(--c-lime);color:var(--c-ink);}
.btn--lime:hover{background:#d9ff63;}
.btn--orange{background:var(--c-orange);border-color:var(--c-orange);color:var(--c-ink);}
.btn--orange:hover{background:#ff8f4d;}
.btn--ghost{border-color:var(--c-edge);color:var(--c-paper);}
.btn--ghost:hover{border-color:var(--c-lime);color:var(--c-lime);}
.btn--block{width:100%;}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin-block:clamp(14px,2vw,22px);}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;letter-spacing:.12em;color:var(--c-gray);}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb-link{color:inherit;transition:color var(--speed) ease;}
.breadcrumb-link:hover{color:var(--c-orange);}
.breadcrumb-sep{color:var(--c-edge);}
.breadcrumb-current{color:var(--c-ink);font-weight:800;}
.section--dark .breadcrumb-current,
.section--night .breadcrumb-current,
.section--stand .breadcrumb-current{color:var(--c-paper);}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--c-edge);
  border-radius:var(--radius);
  background:var(--c-paper);
  color:var(--c-ink);
}
.card--paper{background:var(--c-paper);color:var(--c-ink);border-color:var(--c-ink);}
.card--dark{background:var(--c-stand);color:var(--c-paper);border-color:var(--c-edge);}
.card__label{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.16em;color:var(--c-lime);}
.card--paper .card__label{color:var(--c-orange);}
.card__title{margin-top:8px;font-size:clamp(20px,2.2vw,28px);font-weight:900;letter-spacing:-0.02em;}
.card__meta{margin-top:8px;font-size:13px;line-height:1.7;color:var(--c-gray);}
.card--paper .card__meta{color:#5C6B64;}

/* ---------- 价格数字 ---------- */
.price{display:flex;align-items:baseline;gap:4px;font-variant-numeric:tabular-nums;}
.price__unit{font-size:70%;font-weight:700;letter-spacing:.04em;}
.price__num{font-size:clamp(28px,4vw,44px);font-weight:900;line-height:1;letter-spacing:-0.02em;color:var(--c-orange);}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--c-edge);
  border-radius:var(--radius);
  background:var(--c-stand);
  aspect-ratio:16 / 9;
}
.media-frame img,.media-frame svg{width:100%;height:100%;object-fit:cover;}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame--paper{background:var(--c-tag);border-color:var(--c-ink);}
.placeholder{
  background-color:var(--c-stand);
  background-image:repeating-linear-gradient(135deg,rgba(42,90,71,.65) 0 10px,transparent 10px 22px);
}

/* ---------- 路线引导线 ---------- */
.route-rail{
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:1px;
  background:linear-gradient(180deg,var(--c-lime),rgba(42,90,71,.35));
  pointer-events:none;
}

/* ---------- 显现动效 ---------- */
.js-on [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s ease,transform .5s ease;
}
.js-on [data-reveal].is-visible{opacity:1;transform:none;}
.js-on [data-emphasis]{
  transform:scale(.94);
  transition:transform .45s cubic-bezier(.2,.8,.2,1);
  transform-origin:left bottom;
}
.js-on [data-emphasis].is-lit{transform:scale(1);}

/* ============================================================
   头部：紧凑命令栏
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--c-home);
  background-image:linear-gradient(180deg,rgba(200,241,53,.06),rgba(200,241,53,0) 70%);
  color:var(--c-paper);
  border-bottom:1px solid var(--c-edge);
}
.header-inner{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:13px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(16px,3vw,36px);
}
.brand-block{display:flex;align-items:center;gap:clamp(14px,2vw,28px);min-width:0;}
.brand{display:flex;align-items:center;gap:12px;min-width:0;}
.brand-mark{
  position:relative;
  flex:0 0 auto;
  width:38px;
  height:38px;
  border:1px solid var(--c-lime);
  border-radius:var(--radius);
  background:rgba(200,241,53,.09);
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:11px;
  height:11px;
  border-top:2px solid var(--c-lime);
  border-right:2px solid var(--c-lime);
  transform:translate(-50%,-50%) rotate(45deg);
}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0;}
.brand-name{font-size:19px;font-weight:900;line-height:1.15;letter-spacing:.06em;}
.brand-line{font-size:11px;line-height:1.3;letter-spacing:.16em;color:var(--c-gray);}
.header-index{
  font-size:11px;
  letter-spacing:.16em;
  color:var(--c-gray);
  white-space:nowrap;
}

/* 命令栏导航 */
.site-nav{display:flex;align-items:center;gap:10px;}
.nav-list{display:flex;align-items:center;gap:4px;}
.nav-item{display:block;}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 12px;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-size:14px;
  font-weight:800;
  letter-spacing:.04em;
  line-height:1.2;
  color:var(--c-paper);
  transition:border-color var(--speed) ease,background var(--speed) ease,color var(--speed) ease;
}
.nav-idx{
  font-size:11px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--c-gray);
  font-variant-numeric:tabular-nums;
}
.nav-label{white-space:nowrap;}
.nav-link:hover{border-color:var(--c-edge);background:var(--c-stand);}
.nav-link:hover .nav-idx{color:var(--c-paper);}
.nav-link[aria-current="page"]{
  border-color:var(--c-lime);
  color:var(--c-lime);
  background:rgba(200,241,53,.1);
}
.nav-link[aria-current="page"] .nav-idx{color:var(--c-lime);}
.nav-link[aria-current="page"]::after{
  content:"";
  display:inline-block;
  width:0;
  height:0;
  margin-left:2px;
  border-left:5px solid var(--c-lime);
  border-top:4px solid transparent;
  border-bottom:4px solid transparent;
}
.nav-cta{padding:9px 15px;}

/* 移动端开关 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:8px 12px;
  border:1px solid var(--c-edge);
  border-radius:var(--radius);
  background:rgba(255,255,255,.03);
  color:var(--c-paper);
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  line-height:1;
}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:18px;}
.nav-toggle-bars span{display:block;height:2px;background:var(--c-lime);transition:transform var(--speed) ease,opacity var(--speed) 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);}
.nav-toggle-label{white-space:nowrap;}

/* 滚动进度 */
.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:transparent;
  pointer-events:none;
}
.scroll-progress::after{
  content:"";
  display:block;
  height:100%;
  width:var(--progress,0%);
  background:linear-gradient(90deg,var(--c-lime),var(--c-orange));
  transition:width .1s linear;
}

/* 跳至主要内容 */
.skip-link{
  position:absolute;
  left:12px;
  top:-64px;
  z-index:120;
  padding:10px 16px;
  background:var(--c-lime);
  color:var(--c-ink);
  border-radius:var(--radius);
  font-size:14px;
  font-weight:800;
  letter-spacing:.06em;
  transition:top var(--speed) ease;
}
.skip-link:focus{top:12px;}

/* ============================================================
   页脚：看台坐标分区
   ============================================================ */
.site-footer{
  position:relative;
  background:var(--c-night);
  color:var(--c-paper);
  border-top:1px solid var(--c-edge);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  display:block;
  height:6px;
  background-image:repeating-linear-gradient(135deg,var(--c-lime) 0 8px,transparent 8px 20px);
  opacity:.4;
}
.footer-inner{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(26px,4vw,52px) var(--gutter) clamp(26px,4vw,44px);
}
.footer-coord{
  position:absolute;
  right:var(--gutter);
  top:clamp(30px,4vw,58px);
  writing-mode:vertical-rl;
  font-size:12px;
  letter-spacing:.3em;
  color:rgba(138,154,147,.65);
  display:none;
}
.footer-brand{display:flex;align-items:center;gap:14px;}
.footer-brand-text{display:flex;flex-direction:column;gap:3px;}
.footer-brand-name{font-size:22px;font-weight:900;letter-spacing:.06em;line-height:1.15;}
.footer-brand-line{font-size:12px;letter-spacing:.16em;color:var(--c-gray);line-height:1.3;}
.footer-grid{
  display:grid;
  grid-template-columns:1.1fr 1fr 1.2fr;
  gap:clamp(22px,3vw,56px);
  margin-top:clamp(22px,3vw,40px);
}
.footer-zone{border-top:1px solid var(--c-edge);padding-top:18px;min-width:0;}
.footer-zone--tiers{border-top-color:rgba(200,241,53,.45);}
.footer-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--c-lime);
  line-height:1.4;
}
.footer-title::before{content:"";width:14px;height:1px;background:var(--c-lime);}

.route-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px;}
.route-item{min-width:0;}
.route-link{
  display:block;
  padding:6px 0;
  font-size:14px;
  line-height:1.6;
  color:rgba(244,241,232,.82);
  border-bottom:1px dashed rgba(42,90,71,.9);
  transition:color var(--speed) ease,border-color var(--speed) ease;
}
.route-link:hover{color:var(--c-lime);border-bottom-color:var(--c-lime);}
.route-link--inline{display:inline-block;border-bottom-style:solid;border-bottom-color:var(--c-edge);font-size:13px;}

.tier-list{display:grid;gap:8px;}
.tier-item{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding:9px 12px;
  background:var(--c-stand);
  border:1px solid var(--c-edge);
  border-radius:var(--radius);
}
.tier-name{font-size:14px;font-weight:800;letter-spacing:.04em;}
.tier-cycle{
  font-size:12px;
  font-weight:800;
  letter-spacing:.14em;
  color:var(--c-orange);
  font-variant-numeric:tabular-nums;
}
.footer-note{margin-top:12px;font-size:12px;line-height:1.7;color:var(--c-gray);}

.contact-list{display:grid;gap:10px;}
.contact-item{font-size:13px;line-height:1.7;min-width:0;}
.contact-label{display:block;font-size:11px;letter-spacing:.16em;color:var(--c-gray);}
.contact-value{
  display:inline-block;
  font-weight:700;
  word-break:break-all;
  color:rgba(244,241,232,.9);
  transition:color var(--speed) ease;
}
a.contact-value:hover{color:var(--c-lime);}
.contact-value--lime{color:var(--c-lime);}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(22px,3vw,40px);
  padding-top:18px;
  border-top:1px solid var(--c-edge);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--c-gray);
}
.legal-list{display:flex;flex-wrap:wrap;gap:8px 20px;}
.legal-link{color:rgba(244,241,232,.85);transition:color var(--speed) ease;}
.legal-link:hover{color:var(--c-lime);}
.footer-icp{font-size:12px;letter-spacing:.06em;color:var(--c-gray);}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,32px);
  bottom:clamp(14px,3vw,32px);
  z-index:70;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 14px;
  background:var(--c-night);
  color:var(--c-lime);
  border:1px solid var(--c-lime);
  border-radius:var(--radius);
  font-size:12px;
  font-weight:800;
  letter-spacing:.16em;
  line-height:1;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity var(--speed) ease,transform var(--speed) ease,visibility var(--speed) ease;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none;}
.to-top-arrow{
  width:9px;
  height:9px;
  border-top:2px solid var(--c-lime);
  border-left:2px solid var(--c-lime);
  transform:rotate(45deg);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1320px){
  .header-index{display:none;}
}
@media (min-width:1400px){
  .footer-coord{display:block;}
}
@media (max-width:1080px){
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:block;
    max-height:calc(100vh - 76px);
    overflow-y:auto;
    padding:10px var(--gutter) 24px;
    background:var(--c-night);
    border-top:1px solid var(--c-edge);
    border-bottom:1px solid var(--c-edge);
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-10px);
    transition:opacity var(--speed) ease,transform var(--speed) ease,visibility var(--speed) ease;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:translateY(0);
  }
  .nav-list{display:block;}
  .nav-link{
    width:100%;
    padding:15px 10px;
    border-bottom:1px solid rgba(42,90,71,.65);
    border-radius:0;
    font-size:16px;
  }
  .nav-link[aria-current="page"]{background:rgba(200,241,53,.08);}
  .nav-cta{margin-top:18px;width:100%;}
}
@media (max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr;}
  .footer-zone--route{grid-column:1 / -1;}
}
@media (max-width:760px){
  body{font-size:16px;}
  .grid--2,.grid--3{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-zone--route{grid-column:auto;}
  .route-list{grid-template-columns:1fr 1fr;}
  .footer-base{flex-direction:column;align-items:flex-start;}
  .brand-name{font-size:17px;}
  .brand-line{font-size:10px;letter-spacing:.12em;}
  .to-top span:last-child{display:none;}
  .to-top{padding:12px;border-radius:50%;}
}
@media (max-width:420px){
  .route-list{grid-template-columns:1fr;}
}

/* ============================================================
   动效与可访问性降级
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-on [data-reveal]{opacity:1;transform:none;}
  .js-on [data-emphasis]{transform:none;}
  .btn:hover{transform:none;}
}