/* ===========================================================
   十八游戏中心 · 共享样式表 /assets/site.css
   =========================================================== */

:root{
  --deep-sea:#0A2A43;
  --abyss:#06182A;
  --chart:#123C5C;
  --tide:#1E5C7A;
  --cyan:#35E0D0;
  --mist:#A8F5EE;
  --coral:#FF6B4A;
  --lemon:#FFD166;
  --paper:#F3EEE4;
  --brown:#171310;
  --fog:#8FA6B8;
  --text:#E8F1F5;

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

  --width:1240px;
  --gutter:clamp(20px,5.5vw,76px);
  --space-s:40px;
  --space-m:64px;
  --space-l:96px;

  --header-h:78px;
  --ease:cubic-bezier(.22,.8,.24,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 28px);
}

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

h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;height:auto;}
a{color:var(--cyan);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;}
a:hover{color:var(--mist);}
button{font:inherit;color:inherit;background:none;border:0;}
table{border-collapse:collapse;}
strong{color:var(--mist);font-weight:700;}

::selection{background:var(--cyan);color:var(--abyss);}

:focus-visible{
  outline:2px solid var(--lemon);
  outline-offset:3px;
  border-radius:0;
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:16px;
  z-index:300;
  padding:10px 18px;
  background:var(--lemon);
  color:var(--abyss);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform 200ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);color:var(--abyss);}

/* ===========================================================
   头部
   =========================================================== */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:100;
  background:linear-gradient(to bottom,rgba(6,24,42,.88) 0%,rgba(6,24,42,.55) 62%,rgba(6,24,42,0) 100%);
  color:var(--text);
  transition:background 240ms var(--ease),box-shadow 240ms var(--ease);
}
.site-header[data-state="solid"]{
  background:var(--deep-sea);
  box-shadow:0 1px 0 var(--tide),0 22px 46px -34px #000;
}
.site-header[data-nav-open="true"]{background:var(--abyss);}

/* 版本铭牌栏 */
.header-rail{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:10px;
  max-width:var(--width);
  margin:0 auto;
  padding:9px var(--gutter) 0;
  max-height:44px;
  overflow:hidden;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--mist);
  transition:max-height 260ms var(--ease),opacity 200ms var(--ease),padding 260ms var(--ease);
}
.site-header[data-state="solid"] .header-rail{
  max-height:0;
  opacity:0;
  padding-top:0;
}
.rail-dot{
  width:6px;
  height:6px;
  background:var(--coral);
  box-shadow:0 0 0 1px rgba(255,107,74,.35);
  flex:0 0 auto;
}
.rail-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

/* 主行 */
.header-inner{
  position:relative;
  z-index:2;
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,32px);
  width:100%;
  max-width:var(--width);
  margin:0 auto;
  padding:14px var(--gutter) 16px;
  min-height:var(--header-h);
  transition:min-height 260ms var(--ease),padding 260ms var(--ease);
}
.site-header[data-state="solid"] .header-inner{
  min-height:calc(var(--header-h) - 16px);
  padding-top:10px;
  padding-bottom:10px;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:var(--text);
  text-decoration:none;
}
.brand:hover{color:var(--text);}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  flex:0 0 auto;
  background:var(--cyan);
  color:var(--abyss);
  font-family:var(--font-display);
  font-size:13px;
  font-weight:900;
  letter-spacing:.02em;
  line-height:1;
  border:1px solid var(--abyss);
  box-shadow:inset 0 0 0 3px rgba(6,24,42,.18);
}
.brand-name{display:block;min-width:0;}
.brand-text{
  display:block;
  font-family:var(--font-display);
  font-size:clamp(16px,1.4vw,19px);
  font-weight:900;
  letter-spacing:.14em;
  line-height:1.1;
  white-space:nowrap;
}
.brand-sub{
  display:block;
  margin-top:5px;
  font-family:var(--font-mono);
  font-size:10px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--mist);
  opacity:.62;
  white-space:nowrap;
}

/* 主导航 */
.primary-nav{
  flex:1 1 auto;
  display:flex;
  justify-content:center;
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.9vw,28px);
}
.nav-list a{
  position:relative;
  display:inline-block;
  padding:6px 2px;
  color:var(--text);
  font-family:var(--font-body);
  font-size:15px;
  font-weight:600;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  white-space:nowrap;
  transition:color 180ms var(--ease);
}
.nav-list a::after{
  content:"";
  position:absolute;
  left:2px;
  right:2px;
  bottom:-3px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform 220ms var(--ease),background 180ms var(--ease);
}
.nav-list a:hover,
.nav-list a:focus-visible{color:var(--cyan);}
.nav-list a:hover::after,
.nav-list a:focus-visible::after{transform:scaleX(1);}
.nav-list a[aria-current="page"]{color:var(--cyan);}
.nav-list a[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--lemon);
}
.nav-note{
  display:none;
  font-family:var(--font-serif);
  font-size:14px;
  letter-spacing:.06em;
  color:var(--fog);
}

/* 头部动作区 */
.header-actions{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border:1px solid var(--tide);
  background:transparent;
  color:var(--text);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease),transform 180ms var(--ease);
}
.btn:hover{color:var(--cyan);border-color:var(--cyan);}
.btn:active{transform:translateY(1px);}
.btn-primary{
  background:var(--coral);
  border-color:var(--coral);
  color:var(--abyss);
}
.btn-primary:hover{
  background:var(--lemon);
  border-color:var(--lemon);
  color:var(--abyss);
}
.btn-ghost{border-color:var(--tide);color:var(--mist);}

/* 移动开关 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--tide);
  color:var(--text);
  font-family:var(--font-body);
  font-size:13px;
  font-weight:600;
  letter-spacing:.12em;
  line-height:1;
  cursor:pointer;
  transition:border-color 180ms var(--ease),color 180ms var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:20px;
  height:12px;
  flex:0 0 auto;
}
.nav-toggle-bars span{
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:var(--cyan);
  transition:transform 240ms var(--ease),opacity 160ms linear;
}
.nav-toggle-bars span:nth-child(1){top:0;}
.nav-toggle-bars span:nth-child(2){top:5px;}
.nav-toggle-bars span:nth-child(3){top:10px;}
.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);}

/* 滚动刻度 */
.scroll-bar{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--tide);
  opacity:0;
  transition:opacity 220ms var(--ease);
  pointer-events:none;
}
.site-header[data-state="solid"] .scroll-bar{opacity:.45;}
.scroll-bar-fill{
  display:block;
  width:100%;
  height:100%;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
}

/* ===========================================================
   页脚
   =========================================================== */
.site-footer{
  position:relative;
  margin-top:var(--space-l);
  padding:var(--space-m) var(--gutter) var(--space-s);
  background:var(--abyss);
  color:var(--text);
}
.footer-frame{
  position:relative;
  max-width:var(--width);
  margin:0 auto;
  padding:clamp(24px,3.6vw,44px) clamp(20px,3.4vw,40px);
  border:1px solid var(--tide);
  outline:1px solid rgba(30,92,122,.55);
  outline-offset:5px;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(200px,1fr) 2.2fr;
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.footer-brand{min-width:0;}
.footer-kicker{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  color:var(--fog);
}
.footer-wordmark{
  margin-top:10px;
  font-family:var(--font-display);
  font-size:clamp(21px,2.4vw,28px);
  font-weight:900;
  letter-spacing:.12em;
  line-height:1.2;
  color:var(--text);
}
.footer-tag{
  margin-top:8px;
  font-family:var(--font-serif);
  font-size:14px;
  letter-spacing:.08em;
  color:var(--mist);
  opacity:.85;
}
.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col{min-width:0;}
.footer-col-title{
  position:relative;
  margin-bottom:14px;
  padding-bottom:10px;
  font-family:var(--font-serif);
  font-size:13px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--mist);
}
.footer-col-title::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:26px;
  height:2px;
  background:var(--lemon);
}
.footer-col li + li{margin-top:10px;}
.footer-col a{
  color:var(--text);
  font-size:15px;
  letter-spacing:.04em;
  text-decoration:none;
  transition:color 160ms var(--ease),padding-left 160ms var(--ease);
}
.footer-col a:hover,
.footer-col a:focus-visible{color:var(--cyan);padding-left:4px;}

.footer-contact{
  margin-top:clamp(24px,3.4vw,40px);
  padding-top:clamp(20px,2.6vw,28px);
  border-top:1px dashed var(--tide);
}
.contact-line{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:4px 14px;
  margin-top:8px;
  font-size:14px;
  line-height:1.7;
}
.contact-label{
  flex:0 0 auto;
  min-width:66px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.18em;
  color:var(--fog);
}
.contact-value{
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:500;
  letter-spacing:.06em;
  color:var(--text);
  word-break:break-word;
}
.footer-note{
  max-width:62ch;
  margin-top:16px;
  font-family:var(--font-serif);
  font-size:13px;
  line-height:1.85;
  letter-spacing:.02em;
  color:var(--fog);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:8px 24px;
  margin-top:clamp(22px,3vw,34px);
  padding-top:18px;
  border-top:1px dashed var(--tide);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--fog);
}
.footer-legal{color:var(--mist);}
.footer-copy{letter-spacing:.08em;}

.footer-sig{display:none;}

/* ===========================================================
   通用版式与组件
   =========================================================== */
.container{
  width:100%;
  max-width:var(--width);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.offset-top{padding-top:clamp(96px,13vh,150px);}

.section{padding-top:var(--space-m);padding-bottom:var(--space-m);}
.section--tight{padding-top:var(--space-s);padding-bottom:var(--space-s);}
.section--paper{
  background:var(--paper);
  color:var(--brown);
}
.section--paper a{color:#0B4F62;}
.section--paper .eyebrow{color:#4A4034;}
.section--paper strong{color:var(--brown);}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-serif);
  font-size:14px;
  font-weight:600;
  letter-spacing:.18em;
  line-height:1.4;
  color:var(--mist);
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:var(--cyan);
  flex:0 0 auto;
}

.version-plate{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:6px 12px;
  border:1px solid var(--tide);
  background:rgba(18,60,92,.55);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  line-height:1.4;
  color:var(--cyan);
}

.tag{
  display:inline-block;
  padding:3px 9px;
  border:1px solid currentColor;
  font-family:var(--font-body);
  font-size:12px;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.5;
  text-decoration:none;
}
.tag--cyan{color:var(--cyan);}
.tag--coral{color:var(--coral);}
.tag--lemon{color:var(--lemon);}

.breadcrumb{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--fog);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}
.breadcrumb li::after{
  content:"／";
  margin-left:8px;
  color:var(--tide);
}
.breadcrumb li:last-child::after{content:"";margin-left:0;}
.breadcrumb a{color:var(--mist);text-decoration:none;}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb [aria-current="page"]{color:var(--text);}

.figure{display:grid;gap:10px;}
.figure-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--chart);
  border:1px solid var(--tide);
  outline:2px solid rgba(53,224,208,.35);
  outline-offset:-2px;
}
.figure-frame img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure-frame--3x2{aspect-ratio:3 / 2;}
.figure-frame--4x3{aspect-ratio:4 / 3;}
.figure-frame--16x9{aspect-ratio:16 / 9;}
.figure-frame--slant{clip-path:polygon(0 0,100% 0,100% 90%,0 100%);}
.figure figcaption{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.12em;
  line-height:1.6;
  color:var(--fog);
}

.card{
  position:relative;
  display:block;
  padding:clamp(18px,2.4vw,28px);
  background:var(--chart);
  border:1px solid var(--tide);
  color:var(--text);
  text-decoration:none;
  transition:transform 240ms var(--ease),border-color 200ms var(--ease),box-shadow 240ms var(--ease);
}
.card:hover,
.card:focus-visible{
  border-color:var(--cyan);
  color:var(--text);
  transform:translateY(-3px);
  box-shadow:0 18px 38px -26px #000;
}

.grid{display:grid;gap:clamp(16px,2vw,28px);}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));}

/* 滚动显现协议 */
.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity 420ms var(--ease),transform 420ms var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
.js [data-reveal].is-in{
  opacity:1;
  transform:none;
}

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

@media (max-width:980px){
  .footer-top{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex;}

  .primary-nav{
    position:fixed;
    inset:0;
    z-index:1;
    display:block;
    width:100%;
    padding:calc(var(--header-h) + 34px) var(--gutter) 56px;
    background:var(--abyss);
    overflow-y:auto;
    overscroll-behavior:contain;
    visibility:hidden;
    opacity:0;
    transform:translateY(-14px);
    transition:opacity 240ms var(--ease),transform 300ms var(--ease),visibility 0s linear 300ms;
  }
  .primary-nav[data-open="true"]{
    visibility:visible;
    opacity:1;
    transform:none;
    transition:opacity 240ms var(--ease),transform 300ms var(--ease),visibility 0s linear 0s;
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-list li{border-bottom:1px dashed var(--tide);}
  .nav-list a{
    display:block;
    padding:16px 0 16px 2px;
    font-family:var(--font-display);
    font-size:clamp(21px,6.4vw,28px);
    font-weight:900;
    letter-spacing:.1em;
    line-height:1.15;
  }
  .nav-list a::after{display:none;}
  .nav-list a[aria-current="page"]{color:var(--lemon);}

  .nav-note{
    display:block;
    margin-top:26px;
    font-family:var(--font-serif);
    font-size:14px;
    letter-spacing:.08em;
    color:var(--fog);
  }

  .header-rail{justify-content:flex-start;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:620px){
  :root{--space-l:72px;--space-m:52px;--space-s:34px;}
  .header-actions .btn-primary{display:none;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-base{flex-direction:column;align-items:flex-start;gap:6px;}
  .contact-label{min-width:0;}
  .contact-line{flex-direction:column;gap:2px;}
  .footer-wordmark{letter-spacing:.08em;}
}

@media (min-width:1200px){
  .footer-frame{padding-right:88px;}
  .footer-sig{
    display:block;
    position:absolute;
    top:30px;
    right:30px;
    writing-mode:vertical-rl;
    padding-left:10px;
    border-left:1px solid var(--tide);
    font-family:var(--font-mono);
    font-size:12px;
    font-weight:500;
    letter-spacing:.34em;
    line-height:1;
    color:var(--cyan);
  }
}

@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;
  }
  .js [data-reveal]{
    opacity:1;
    transform:none;
    transition:none;
  }
  .card:hover,
  .card:focus-visible{transform:none;}
  .footer-col a:hover,
  .footer-col a:focus-visible{padding-left:0;}
}