/* =========================================================
   龙腾游艺 · 共享站点样式 /assets/site.css
   1 变量 / 2 重置 / 3 排版 / 4 通用组件 / 5 头部 / 6 页脚
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0B0D12;
  --indigo:#141B33;
  --red:#D7262E;
  --red-dark:#B01B22;
  --red-deep:#7A2E26;
  --gold:#F2B544;
  --jade:#1FA98A;
  --amber:#F47A2A;
  --cloud:#F8F3E7;
  --scale:#8C93A3;

  --on-dark:rgba(248,243,231,.82);
  --on-dark-soft:rgba(248,243,231,.60);
  --hairline:rgba(248,243,231,.14);
  --hairline-dark:rgba(11,13,18,.10);

  --font-display:"Songti SC","Source Han Serif SC","Noto Serif SC","SimSun","STSong",serif;
  --font-body:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-latin:"Inter","Manrope","DIN Alternate","Helvetica Neue",Arial,sans-serif;

  --w-max:1240px;
  --gutter:clamp(18px,4vw,48px);
  --radius:14px;
  --radius-sm:8px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  background:var(--cloud);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;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}
table{border-collapse:collapse;width:100%}
::selection{background:var(--red);color:#fff}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
  border-radius:6px;
  box-shadow:0 0 0 4px rgba(242,181,68,.22);
}

/* ---------- 3. 排版 ---------- */
body,
p,
li{letter-spacing:.01em}

p{max-width:36em}

.display-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(34px,6vw,96px);
  line-height:1.02;
  letter-spacing:-.01em;
}

.section-title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(24px,3.2vw,40px);
  line-height:1.2;
  letter-spacing:.01em;
}

.eyebrow{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-latin);
  font-size:12px;
  font-weight:600;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--red);
}

.eyebrow::before{
  content:"";
  width:26px;
  height:2px;
  background:currentColor;
  flex:none;
}

.lede{
  font-size:clamp(16px,1.6vw,18px);
  line-height:1.8;
  color:rgba(11,13,18,.76);
  max-width:38ch;
}

/* ---------- 4. 通用组件 ---------- */
.container{
  width:100%;
  max-width:var(--w-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:820px}
.container--wide{max-width:1440px}

.section{padding-block:clamp(48px,7vw,96px)}
.section--dark{background:var(--ink);color:var(--cloud)}
.section--dark .lede{color:var(--on-dark)}
.section--dark .eyebrow{color:var(--gold)}
.section--indigo{background:var(--indigo);color:var(--cloud)}
.section--indigo .lede{color:var(--on-dark)}
.section--indigo .eyebrow{color:var(--gold)}

.grid{display:grid;gap:clamp(18px,3vw,32px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}

.aside-note{
  border-left:2px solid var(--gold);
  padding-left:12px;
  font-size:12.5px;
  line-height:1.9;
  color:var(--scale);
}
.section--dark .aside-note,
.section--indigo .aside-note{color:var(--on-dark-soft)}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border-radius:10px;
  border:1px solid transparent;
  font-size:14px;
  font-weight:600;
  line-height:1.4;
  cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn--primary{
  background:var(--red);
  color:#fff;
  box-shadow:0 8px 22px rgba(215,38,46,.28);
}
.btn--primary:hover{background:var(--red-dark);transform:translateY(-1px)}
.btn--gold{background:var(--gold);color:var(--ink)}
.btn--gold:hover{background:#FFC960;transform:translateY(-1px)}
.btn--ghost{
  background:transparent;
  border-color:rgba(242,181,68,.5);
  color:var(--gold);
}
.btn--ghost:hover{background:rgba(242,181,68,.12)}
.btn--sm{padding:8px 14px;font-size:13px}

.breadcrumbs{padding-block:14px}
.breadcrumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-size:12px;
  letter-spacing:.08em;
  color:var(--scale);
}
.breadcrumbs__item{display:flex;align-items:center;gap:10px}
.breadcrumbs__item + .breadcrumbs__item::before{
  content:"/";
  color:rgba(140,147,163,.6);
}
.breadcrumbs__link{color:inherit;transition:color .18s var(--ease)}
.breadcrumbs__link:hover{color:var(--red)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid rgba(215,38,46,.32);
  border-radius:999px;
  background:rgba(215,38,46,.06);
  color:var(--red);
  font-size:12px;
  line-height:1.6;
}

.badge{
  display:inline-flex;
  align-items:center;
  padding:3px 10px;
  border-radius:999px;
  background:var(--gold);
  color:var(--ink);
  font-family:var(--font-latin);
  font-size:11px;
  font-weight:700;
  letter-spacing:.1em;
}

.surface{
  background:#fff;
  border:1px solid var(--hairline-dark);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
}
.surface--dark{
  background:var(--indigo);
  border-color:rgba(242,181,68,.2);
  color:var(--cloud);
}

.rule{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,var(--red),rgba(242,181,68,.6),rgba(242,181,68,0));
}

/* 图片容器基础规则（页面阶段放 img / figcaption） */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius);
  aspect-ratio:16/10;
  background:
    radial-gradient(120% 90% at 20% 0%,rgba(215,38,46,.42),transparent 60%),
    linear-gradient(140deg,var(--indigo),var(--ink));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--cut{
  clip-path:polygon(0 0,100% 0,100% 72%,88% 100%,0 100%);
  border-radius:var(--radius) 0 0 var(--radius);
}
.media-frame__img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__caption{
  position:absolute;
  left:14px;
  bottom:12px;
  padding:4px 10px;
  border-radius:999px;
  background:rgba(11,13,18,.62);
  color:rgba(248,243,231,.9);
  font-size:12px;
  line-height:1.6;
}

.visually-hidden{
  position:absolute;
  width:1px;
  height:1px;
  padding:0;
  margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

.reveal{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 5. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--ink);
  color:var(--cloud);
  box-shadow:0 1px 0 rgba(242,181,68,.18),0 14px 32px rgba(11,13,18,.22);
}

.skip-link{
  position:fixed;
  top:8px;
  left:8px;
  z-index:200;
  padding:10px 16px;
  border-radius:8px;
  background:var(--gold);
  color:var(--ink);
  font-size:14px;
  font-weight:700;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.header-rail{
  background:linear-gradient(90deg,var(--red) 0%,var(--red-dark) 38%,var(--red-deep) 62%,var(--indigo) 100%);
  border-bottom:1px solid rgba(242,181,68,.45);
}
.header-rail__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  max-width:var(--w-max);
  margin-inline:auto;
  padding:5px var(--gutter);
}
.header-rail__brand{
  font-size:11.5px;
  letter-spacing:.22em;
  color:rgba(248,243,231,.94);
  max-width:none;
}
.header-rail__meta{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:11.5px;
  letter-spacing:.14em;
  color:rgba(248,243,231,.82);
  max-width:none;
}
.status-dot{
  display:inline-block;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--jade);
  box-shadow:0 0 0 3px rgba(31,169,138,.28);
  flex:none;
}

.header-bar{position:relative}
.header-bar__inner{
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  width:100%;
  max-width:var(--w-max);
  margin-inline:auto;
  padding:10px var(--gutter);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:none;
}
.brand__seal{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  border-radius:12px 4px 12px 4px;
  background:linear-gradient(140deg,var(--gold),var(--amber));
  color:var(--ink);
  font-family:var(--font-display);
  font-size:22px;
  font-weight:800;
  line-height:1;
  box-shadow:inset 0 0 0 1px rgba(11,13,18,.22),0 6px 16px rgba(215,38,46,.28);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--cloud);
}
.brand__sub{
  font-family:var(--font-latin);
  font-size:9.5px;
  letter-spacing:.3em;
  color:var(--on-dark-soft);
}

.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(8px,1.4vw,20px);
  margin-left:auto;
  min-width:0;
}

.nav-primary{
  counter-reset:nav;
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-primary__item{display:block}
.nav-primary__link{
  counter-increment:nav;
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 10px;
  border-radius:var(--radius-sm);
  font-size:13.5px;
  letter-spacing:.04em;
  color:var(--on-dark);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-primary__link::before{
  content:counter(nav,decimal-leading-zero);
  font-family:var(--font-latin);
  font-size:9.5px;
  letter-spacing:.08em;
  color:var(--scale);
}
.nav-primary__link:hover{
  color:#fff;
  background:rgba(215,38,46,.20);
}
.nav-primary__link[aria-current="page"]{color:var(--gold)}
.nav-primary__link[aria-current="page"]::before{color:var(--gold)}
.nav-primary__link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:10px;
  right:10px;
  bottom:2px;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--red),var(--gold));
}

.nav-aux{
  display:flex;
  align-items:center;
  gap:10px;
  padding-left:clamp(10px,1.4vw,18px);
  border-left:1px solid var(--hairline);
}
.nav-tags{display:flex;align-items:center;gap:6px}
.nav-tag{
  display:inline-flex;
  align-items:center;
  padding:4px 10px;
  border:1px solid rgba(242,181,68,.38);
  border-radius:999px;
  color:var(--gold);
  font-size:12px;
  letter-spacing:.04em;
  white-space:nowrap;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-tag:hover{background:rgba(242,181,68,.14);border-color:var(--gold)}
.nav-tag[aria-current="page"]{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.nav-note{display:none}
.nav-cta{display:none}

.header-cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  flex:none;
  padding:10px 16px;
  border-radius:10px;
  background:linear-gradient(135deg,var(--red),var(--red-dark));
  color:#fff;
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  white-space:nowrap;
  box-shadow:0 8px 20px rgba(215,38,46,.32),inset 0 0 0 1px rgba(242,181,68,.42);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease);
}
.header-cta::after{content:"↗";font-family:var(--font-latin);color:var(--gold);font-size:12px}
.header-cta:hover{
  transform:translateY(-1px);
  box-shadow:0 12px 26px rgba(215,38,46,.42),inset 0 0 0 1px var(--gold);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  margin-left:auto;
  padding:8px 12px;
  border:1px solid var(--hairline);
  border-radius:10px;
  background:rgba(248,243,231,.06);
  color:var(--cloud);
  font-size:13px;
  cursor:pointer;
}
.nav-toggle:hover{background:rgba(248,243,231,.12)}
.nav-toggle__bars{display:grid;gap:4px;flex:none}
.nav-toggle__bars i{
  display:block;
  width:16px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{line-height:1}

.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:3px;
  background:rgba(248,243,231,.08);
  overflow:hidden;
}
.scroll-progress__bar{
  display:block;
  width:100%;
  height:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red),var(--amber),var(--gold));
  transition:transform .1s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--cloud);
  padding-bottom:clamp(28px,4vw,44px);
}
.footer-slash{
  height:8px;
  background:linear-gradient(90deg,var(--red) 0 38%,var(--gold) 38% 43%,var(--amber) 43% 46%,var(--indigo) 46% 100%);
}
.footer-inner{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,1fr) minmax(0,1.2fr);
  gap:clamp(24px,4vw,56px);
  width:100%;
  max-width:var(--w-max);
  margin-inline:auto;
  padding:clamp(36px,5vw,64px) var(--gutter) clamp(26px,3vw,40px);
}

.footer-brand__mark{
  font-family:var(--font-display);
  font-size:clamp(26px,3vw,34px);
  font-weight:800;
  letter-spacing:.14em;
  line-height:1.2;
  color:var(--cloud);
  max-width:none;
}
.footer-brand__line{
  margin-top:6px;
  font-size:12px;
  letter-spacing:.2em;
  color:var(--gold);
  max-width:none;
}
.footer-brand__intro{
  margin-top:16px;
  font-size:14px;
  line-height:1.85;
  color:var(--on-dark);
  max-width:30em;
}
.footer-brand .btn{margin-top:20px}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.footer-nav__group{min-width:0}
.footer-nav__title{
  font-family:var(--font-latin);
  font-size:11.5px;
  font-weight:700;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--scale);
  margin-bottom:14px;
}
.footer-nav__list{display:grid;gap:10px}
.footer-link{
  display:inline-block;
  font-size:14px;
  color:var(--on-dark);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover{color:var(--gold);transform:translateX(2px)}
.footer-link--sm{font-size:12.5px;color:var(--on-dark-soft)}

.footer-contact{min-width:0}
.contact-list{display:grid;gap:14px}
.contact-line{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:baseline;
  gap:10px;
  padding-bottom:12px;
  border-bottom:1px solid var(--hairline);
}
.contact-line__label{
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--scale);
  white-space:nowrap;
}
.contact-line__value{
  font-family:var(--font-latin);
  font-size:13.5px;
  line-height:1.7;
  color:var(--cloud);
  word-break:break-word;
}
.copy-btn{
  padding:3px 10px;
  border:1px solid rgba(242,181,68,.4);
  border-radius:999px;
  color:var(--gold);
  font-size:11.5px;
  letter-spacing:.06em;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.copy-btn:hover{background:rgba(242,181,68,.14)}
.footer-note{
  margin-top:14px;
  font-size:12px;
  line-height:1.9;
  color:var(--on-dark-soft);
  max-width:32em;
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 24px;
  width:100%;
  max-width:var(--w-max);
  margin-inline:auto;
  padding:18px var(--gutter) 0;
  border-top:1px solid var(--hairline);
}
.legal-list{display:flex;flex-wrap:wrap;align-items:center;gap:20px}
.footer-legal__meta{
  font-family:var(--font-latin);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--scale);
  max-width:none;
}

.copy-toast{
  position:fixed;
  left:50%;
  bottom:26px;
  z-index:120;
  padding:10px 18px;
  border-radius:999px;
  border:1px solid rgba(242,181,68,.5);
  background:rgba(11,13,18,.94);
  color:var(--cloud);
  font-size:13px;
  line-height:1.6;
  max-width:min(88vw,420px);
  text-align:center;
  opacity:0;
  transform:translate(-50%,12px);
  pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.copy-toast[data-visible="true"]{
  opacity:1;
  transform:translate(-50%,0);
}

.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  z-index:110;
  padding:10px 14px;
  border-radius:999px;
  border:1px solid rgba(242,181,68,.45);
  background:rgba(11,13,18,.9);
  color:var(--gold);
  font-size:12.5px;
  letter-spacing:.08em;
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transform:translateY(8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),background-color .18s var(--ease);
}
body[data-scrolled="true"] .to-top{opacity:1;pointer-events:auto;transform:none}
.to-top:hover{background:rgba(215,38,46,.9);color:#fff;border-color:var(--red)}

/* ---------- 7. 响应式 ---------- */
@media (max-width:1180px){
  .nav-primary__link{font-size:12.5px;padding:7px 8px}
  .nav-note{display:none}
}

@media (max-width:1000px){
  .nav-toggle{display:inline-flex;order:3}
  .header-cta{display:none}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:8px var(--gutter) 24px;
    background:linear-gradient(180deg,var(--indigo),var(--ink));
    border-top:1px solid rgba(242,181,68,.35);
    box-shadow:0 26px 44px rgba(0,0,0,.5);
    max-height:calc(100vh - 96px);
    overflow-y:auto;
  }
  .site-nav[data-open="true"]{display:flex}

  .nav-primary{
    counter-reset:nav;
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-primary__link{
    display:flex;
    align-items:center;
    gap:12px;
    padding:14px 4px;
    font-size:16px;
    border-bottom:1px solid var(--hairline);
    border-radius:0;
  }
  .nav-primary__link::before{font-size:11px}
  .nav-primary__link[aria-current="page"]{
    background:linear-gradient(90deg,rgba(215,38,46,.28),transparent);
  }
  .nav-primary__link[aria-current="page"]::after{left:4px;right:auto;width:22px;bottom:6px}

  .nav-aux{
    flex-direction:column;
    align-items:stretch;
    gap:14px;
    padding-left:0;
    padding-top:18px;
    border-left:0;
  }
  .nav-tags{flex-wrap:wrap;gap:8px}
  .nav-tag{font-size:12.5px;padding:6px 14px}
  .nav-note{
    display:block;
    font-size:12px;
    line-height:1.8;
    color:var(--on-dark-soft);
    max-width:none;
  }
  .nav-cta{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    padding:12px 18px;
    border-radius:10px;
    background:linear-gradient(135deg,var(--red),var(--red-dark));
    color:#fff;
    font-size:14px;
    font-weight:600;
    box-shadow:inset 0 0 0 1px rgba(242,181,68,.42);
  }

  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:720px){
  .header-rail__meta{display:none}
  .header-rail__inner{padding-block:6px}
  .brand__seal{width:36px;height:36px;font-size:19px}
  .brand__name{font-size:17px}
  .brand__sub{font-size:8.5px;letter-spacing:.24em}

  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:10px}
  .legal-list{gap:14px}

  .contact-line{grid-template-columns:1fr auto;gap:4px 10px}
  .contact-line__label{grid-column:1 / -1}
  .contact-line__value{font-size:13px}

  .copy-toast{bottom:76px}
}

@media (max-width:420px){
  .nav-toggle__label{display:none}
  .footer-nav{grid-template-columns:minmax(0,1fr)}
}

@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;
  }
  .reveal{opacity:1;transform:none}
}

@media print{
  .site-header,.site-footer,.to-top,.copy-toast,.scroll-progress{display:none !important}
  body{background:#fff;color:#000}
}