/* ============================================================
   龙腾游艺 / site.css
   共享外壳：reset · 变量 · 中文排版 · 头部 · 页脚 · 通用组件
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
}
body{margin:0}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
table{border-collapse:collapse}
[hidden]{display:none !important}

/* ---------- 变量 ---------- */
:root{
  --red:#B3261E;
  --red-deep:#8C1B15;
  --gold:#D8A23A;
  --gold-soft:#EFD49A;
  --ink:#1F3D35;
  --stone:#4C6E78;
  --cream:#FAF6EE;
  --sand:#F1E8D7;
  --char:#1E1B18;
  --glass:rgba(255,255,255,.72);
  --ok:#2E7D5A;
  --warn:#8A4B2A;
  --line:rgba(31,61,53,.14);
  --line-soft:rgba(31,61,53,.08);

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",ui-monospace,"Courier New",monospace;

  --wrap:1240px;
  --radius:18px;
  --radius-sm:10px;
  --shadow-1:0 18px 40px -30px rgba(31,61,53,.7);
  --shadow-2:0 22px 44px -30px rgba(179,38,30,.75);
}

/* ---------- 基础排版 ---------- */
body{
  background-color:var(--cream);
  background-image:
    radial-gradient(120% 70% at 100% -10%,rgba(216,162,58,.10),transparent 62%),
    radial-gradient(90% 60% at -10% 0%,rgba(76,110,120,.10),transparent 60%);
  color:var(--char);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.3;color:var(--ink);letter-spacing:.01em}
h1{font-size:clamp(2rem,4.6vw,3rem);font-weight:800}
h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:700}
h3{font-size:clamp(1.12rem,2vw,1.32rem);font-weight:600}
p{max-width:70ch}
::selection{background:var(--gold-soft);color:var(--char)}
:focus-visible{outline:2px solid var(--stone);outline-offset:3px;border-radius:4px}
#main-content:focus{outline:none}
#main-content:focus-visible{outline:2px solid var(--stone);outline-offset:-2px}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:.7rem;
  left:.8rem;
  z-index:220;
  padding:.62rem 1.1rem;
  border-radius:999px;
  background:var(--ink);
  color:var(--cream);
  font-size:.88rem;
  font-weight:600;
  letter-spacing:.08em;
  transform:translateY(-180%);
  transition:transform .2s ease;
  box-shadow:0 14px 30px -18px rgba(0,0,0,.8);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 滚动进度鳞线（JS 注入） ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  z-index:210;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--red) 0%,var(--gold) 52%,var(--stone) 100%);
  pointer-events:none;
}

/* ============================================================
   头部：紧凑命令栏
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:linear-gradient(180deg,rgba(250,246,238,.97) 0%,rgba(250,246,238,.88) 100%);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  border-bottom:1px solid var(--line);
  box-shadow:0 18px 36px -32px rgba(31,61,53,.95);
}
.header-inner{
  max-width:var(--wrap);
  margin-inline:auto;
  padding:.62rem clamp(1rem,4vw,2.4rem);
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(.85rem,2.4vw,2.2rem);
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:.68rem;
  min-width:0;
  justify-self:start;
}
.brand-mark{
  position:relative;
  width:36px;
  height:36px;
  flex:0 0 auto;
  border-radius:11px;
  display:grid;
  place-items:center;
  background:linear-gradient(145deg,var(--red) 0%,var(--red-deep) 52%,var(--gold) 100%);
  box-shadow:0 12px 22px -16px rgba(179,38,30,1);
}
.brand-mark::before{
  content:"";
  width:15px;
  height:15px;
  border-radius:3px;
  transform:rotate(45deg);
  background:var(--cream);
  box-shadow:inset 0 0 0 3px rgba(31,61,53,.88);
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:5px;
  border-radius:7px;
  border:1px solid rgba(250,246,238,.5);
  pointer-events:none;
}
.brand-text{display:block;min-width:0}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.1rem;
  line-height:1.15;
  letter-spacing:.16em;
  color:var(--ink);
}
.brand-sub{
  display:block;
  margin-top:2px;
  font-family:var(--font-mono);
  font-size:.56rem;
  letter-spacing:.3em;
  color:var(--stone);
}

/* 主导航 */
.header-nav{justify-self:center;min-width:0}
.nav-list{display:flex;align-items:center;flex-wrap:wrap;gap:.1rem}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:.42rem;
  padding:.55rem .76rem;
  border-radius:9px;
  font-size:.92rem;
  font-weight:500;
  letter-spacing:.05em;
  color:rgba(30,27,24,.78);
  transition:color .18s ease,background-color .18s ease;
}
.nav-link:hover{color:var(--red);background:rgba(179,38,30,.06)}
.nav-num{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.06em;
  color:var(--gold);
  transform:translateY(-.34em);
}
.nav-link[aria-current="page"]{
  color:var(--red);
  font-weight:600;
  background:rgba(179,38,30,.07);
}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:.76rem;
  right:.76rem;
  bottom:.26rem;
  height:2px;
  border-radius:2px;
  background:linear-gradient(90deg,var(--red),var(--gold));
}

/* 常驻工具串 */
.header-tools{
  display:flex;
  align-items:center;
  gap:.28rem;
  padding:.26rem;
  border-radius:999px;
  background:var(--glass);
  border:1px solid var(--line-soft);
  box-shadow:0 14px 28px -26px rgba(31,61,53,1);
  justify-self:end;
}
.tool-link{
  padding:.44rem .82rem;
  border-radius:999px;
  font-size:.8rem;
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink);
  white-space:nowrap;
  transition:background-color .18s ease,color .18s ease;
}
.tool-link:hover{background:rgba(31,61,53,.09)}
.tool-link--accent{background:var(--red);color:var(--cream)}
.tool-link--accent:hover{background:var(--red-deep);color:#fff}

/* 移动端索引按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .88rem;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--glass);
  color:var(--ink);
  font-size:.82rem;
  font-weight:600;
  letter-spacing:.16em;
  cursor:pointer;
  justify-self:end;
}
.nav-toggle:hover{border-color:rgba(179,38,30,.4)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--red);
  transition:transform .2s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-label{line-height:1}

/* ============================================================
   页脚：深墨绿展台
   ============================================================ */
.site-footer{
  position:relative;
  overflow:hidden;
  color:rgba(250,246,238,.84);
  background-image:
    radial-gradient(120% 90% at 6% 0%,rgba(216,162,58,.20),transparent 58%),
    radial-gradient(95% 80% at 100% 4%,rgba(76,110,120,.36),transparent 64%),
    linear-gradient(180deg,#223F37 0%,#1F3D35 100%);
  margin-top:clamp(3rem,7vw,6rem);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  opacity:.55;
  background-image:radial-gradient(circle at 50% 100%,transparent 13px,rgba(216,162,58,.13) 14px,transparent 15px);
  background-size:34px 19px;
}
.site-footer::after{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  background:linear-gradient(90deg,var(--red) 0%,var(--gold) 46%,var(--stone) 76%,var(--ink) 100%);
}
.footer-inner{
  position:relative;
  z-index:1;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(2.6rem,5vw,4rem) clamp(1.1rem,4vw,2.4rem) clamp(1.6rem,3vw,2.4rem);
  display:grid;
  grid-template-columns:1.5fr 1fr 1.15fr 1fr;
  gap:clamp(1.6rem,3.4vw,2.8rem);
}
.footer-brand-mark{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:800;
  font-size:1.32rem;
  letter-spacing:.2em;
  color:var(--cream);
}
.footer-tagline{
  margin-top:.85rem;
  font-family:var(--font-display);
  font-size:1.02rem;
  letter-spacing:.14em;
  color:var(--gold-soft);
}
.footer-note{
  margin-top:.6rem;
  max-width:30ch;
  font-size:.86rem;
  line-height:1.8;
  color:rgba(250,246,238,.62);
}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:.9rem;
  font-family:var(--font-mono);
  font-size:.64rem;
  font-weight:500;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:rgba(216,162,58,.92);
}
.footer-list{display:grid;gap:.5rem;font-size:.88rem}
.footer-list a{
  display:inline-block;
  color:rgba(250,246,238,.8);
  transition:color .18s ease,transform .18s ease;
}
.footer-list a:hover{color:var(--gold-soft);transform:translateX(3px)}
.footer-contact{display:grid;gap:.62rem;font-size:.86rem}
.footer-contact li{display:grid;gap:.1rem;min-width:0}
.footer-contact-key{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:rgba(250,246,238,.42);
}
.footer-contact-val{
  color:rgba(250,246,238,.88);
  word-break:break-word;
  line-height:1.6;
}
.footer-base{
  position:relative;
  z-index:1;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:1rem clamp(1.1rem,4vw,2.4rem) 1.7rem;
  border-top:1px solid rgba(250,246,238,.14);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem 1.6rem;
  font-size:.78rem;
  letter-spacing:.05em;
  color:rgba(250,246,238,.56);
}
.footer-copy{margin:0;max-width:none}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem 1.1rem}
.footer-legal a{color:rgba(250,246,238,.7);transition:color .18s ease}
.footer-legal a:hover{color:var(--gold-soft)}
.footer-icp{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;color:rgba(250,246,238,.5)}

/* ============================================================
   通用布局
   ============================================================ */
.container{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:clamp(1.1rem,4vw,2.4rem);
}
.container--narrow{max-width:840px}
.grid{display:grid;gap:clamp(1.1rem,2.6vw,2.1rem)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:500;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--stone);
}
.eyebrow::before{
  content:"";
  width:1.5rem;
  height:1px;
  background:var(--gold);
}
.section-title{font-size:clamp(1.5rem,3vw,2.1rem)}
.lede{
  font-size:1.04rem;
  line-height:1.8;
  color:rgba(31,61,53,.78);
  max-width:64ch;
}

/* ============================================================
   按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.72rem 1.4rem;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:.94rem;
  font-weight:600;
  letter-spacing:.06em;
  cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--red);color:var(--cream);box-shadow:var(--shadow-2)}
.btn--primary:hover{background:var(--red-deep)}
.btn--gold{
  background:linear-gradient(120deg,var(--gold) 0%,var(--gold-soft) 100%);
  color:#3A2A08;
  box-shadow:0 16px 32px -24px rgba(216,162,58,1);
}
.btn--gold:hover{background:linear-gradient(120deg,#CE9930 0%,var(--gold) 100%)}
.btn--ghost{
  background:var(--glass);
  border-color:var(--line);
  color:var(--ink);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.btn--ghost:hover{border-color:rgba(179,38,30,.42);color:var(--red)}

/* ============================================================
   面包屑
   ============================================================ */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-size:.8rem;
  letter-spacing:.05em;
  color:rgba(31,61,53,.6);
}
.crumbs a{transition:color .18s ease}
.crumbs a:hover{color:var(--red)}
.crumbs .crumbs-sep{color:rgba(216,162,58,.9);line-height:1}
.crumbs [aria-current="page"]{color:var(--ink);font-weight:600}

/* ============================================================
   图片容器（页面阶段放置媒体）
   ============================================================ */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  border-radius:var(--radius);
  border:1px solid var(--line);
  background-image:linear-gradient(150deg,var(--sand) 0%,#FFFFFF 55%,var(--sand) 100%);
  box-shadow:var(--shadow-1);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    radial-gradient(120% 90% at 88% -12%,rgba(216,162,58,.26),transparent 60%),
    radial-gradient(80% 70% at 0% 110%,rgba(76,110,120,.18),transparent 62%);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--16x10{aspect-ratio:16/10}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--wide{aspect-ratio:21/9}
.media-caption{
  margin-top:.6rem;
  font-size:.78rem;
  letter-spacing:.05em;
  color:rgba(31,61,53,.58);
}

/* ============================================================
   分段切换（标签页）
   ============================================================ */
[data-tabs]{display:block}
.tablist{
  display:flex;
  flex-wrap:wrap;
  gap:.3rem;
  width:max-content;
  max-width:100%;
  padding:.3rem;
  border-radius:999px;
  background:rgba(31,61,53,.06);
  border:1px solid var(--line-soft);
}
.tab{
  border:0;
  background:transparent;
  padding:.5rem 1.1rem;
  border-radius:999px;
  font-size:.88rem;
  font-weight:600;
  letter-spacing:.06em;
  color:rgba(31,61,53,.72);
  cursor:pointer;
  transition:background-color .2s ease,color .2s ease,box-shadow .2s ease;
}
.tab:hover{color:var(--ink)}
.tab[aria-selected="true"]{
  background:var(--cream);
  color:var(--red);
  box-shadow:0 8px 18px -14px rgba(31,61,53,1);
}
.tabpanel{margin-top:1.4rem;animation:tabIn .32s ease both}
.tabpanel[hidden]{display:none}
@keyframes tabIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ============================================================
   折叠面板
   ============================================================ */
.fold{border-bottom:1px solid var(--line-soft)}
.fold > summary{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:1rem;
  padding:1.05rem .25rem;
  font-family:var(--font-display);
  font-size:1.05rem;
  font-weight:600;
  color:var(--ink);
  cursor:pointer;
  list-style:none;
}
.fold > summary::-webkit-details-marker{display:none}
.fold > summary::after{
  content:"+";
  font-family:var(--font-mono);
  font-size:1.1rem;
  line-height:1.4;
  color:var(--gold);
}
.fold[open] > summary::after{content:"–"}
.fold-body{
  padding:.2rem .25rem 1.25rem;
  color:rgba(31,61,53,.8);
  font-size:.94rem;
}

/* ============================================================
   滚动显现（仅在 JS 可用时启用）
   ============================================================ */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

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

@media (max-width:1024px){
  .header-inner{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:.55rem .75rem;
    padding:.62rem clamp(1rem,4.5vw,1.6rem);
  }
  .brand{flex:1 1 auto}
  .brand-sub{display:none}
  .nav-toggle{display:inline-flex;flex:0 0 auto}
  .header-nav{
    order:3;
    flex:1 1 100%;
    display:none;
    margin-top:.2rem;
    padding-top:.6rem;
    border-top:1px solid var(--line);
  }
  .header-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:.15rem}
  .nav-link{
    display:flex;
    padding:.72rem .6rem;
    border-radius:var(--radius-sm);
    font-size:.98rem;
  }
  .nav-link[aria-current="page"]{background:rgba(179,38,30,.09)}
  .nav-link[aria-current="page"]::after{left:.6rem;right:auto;width:22px;bottom:.42rem}

  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-inner{grid-template-columns:1.3fr 1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:760px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-base{flex-direction:column;align-items:flex-start}
  .tablist{width:100%;border-radius:16px}
  .tab{flex:1 1 auto;text-align:center}
}

@media (max-width:520px){
  body{font-size:15.5px}
  .footer-inner{grid-template-columns:1fr}
  .brand-name{font-size:1.02rem;letter-spacing:.12em}
  .btn{width:100%}
}

/* ============================================================
   动效偏好
   ============================================================ */
@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;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
  .footer-list a:hover{transform:none}
}