/* ==========================================================================
   龙8游戏站 · 共享外壳样式 /assets/site.css
   深蓝数据夜视仪 · 框架式左栏导航 · 纵向叙事长卷
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;background:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}

/* ---------- 2. Tokens ---------- */
:root{
  --ink-900:#0A1526;
  --ink-850:#0C1A2E;
  --ink-800:#101F35;
  --ink-700:#17293F;
  --line-600:#1E3350;
  --cyan:#2FE6D0;
  --gold:#F2C14E;
  --alert:#FF6B4A;
  --ok:#3DDC97;
  --text:#E8F1FF;
  --muted:#9AAEC6;

  --rail:276px;
  --shell:1200px;
  --pad-x:clamp(18px,4vw,42px);

  --r-xl:28px;
  --r-lg:20px;
  --r-md:14px;
  --r-sm:10px;
  --pill:999px;

  --font-ui:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --accent:var(--cyan);
  --shadow-card:0 30px 70px -46px rgba(0,0,0,.95);
  --glow:0 0 0 1px rgba(47,230,208,.45),0 0 26px -8px rgba(47,230,208,.55);
  --ease:cubic-bezier(.22,.61,.36,1);
}
:root[data-accent="cyan"]{--accent:var(--cyan)}
:root[data-accent="gold"]{--accent:var(--gold)}
:root[data-accent="alert"]{--accent:var(--alert)}

/* ---------- 3. Base ---------- */
body{
  min-height:100vh;
  background:var(--ink-900);
  color:var(--text);
  font-family:var(--font-ui);
  font-size:1rem;
  line-height:1.85;
  letter-spacing:.008em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(47,230,208,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(47,230,208,.05) 1px,transparent 1px);
  background-size:72px 72px;
  opacity:.55;
}
#main-content{position:relative;z-index:1;display:block}

h1,h2,h3,h4{font-weight:800;line-height:1.24;letter-spacing:-.02em;color:var(--text)}
h1{font-size:clamp(2.05rem,4.6vw,3.4rem);font-weight:900;letter-spacing:-.035em;font-stretch:condensed;text-wrap:balance}
h2{font-size:clamp(1.45rem,2.6vw,2rem);text-wrap:balance}
h3{font-size:clamp(1.12rem,1.8vw,1.38rem)}
p{margin-bottom:1.1em}
p:last-child{margin-bottom:0}

a{color:var(--cyan);text-decoration:none;transition:color .18s var(--ease)}
a:hover{color:#7FF5E6;text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}

.mono,.data-value,.data-label,.nav-num,.footer-legal,.footer-contact-line .mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:0;
}
.muted{color:var(--muted)}
.sep{color:var(--line-600);padding:0 .5em}

/* ---------- 4. Layout helpers ---------- */
.container,
.footer-frame{
  width:100%;
  max-width:calc(var(--shell) + var(--pad-x) * 2);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.section{padding-block:clamp(38px,6vw,80px);position:relative;z-index:1}
.section + .section{border-top:1px solid var(--line-600)}
.section-head{display:flex;align-items:baseline;gap:clamp(12px,2vw,22px);flex-wrap:wrap;margin-bottom:clamp(18px,2.6vw,32px)}
.section-num{
  font-family:var(--font-mono);
  font-size:clamp(1.6rem,3.4vw,2.4rem);
  font-weight:700;
  line-height:1;
  color:transparent;
  -webkit-text-stroke:1px var(--accent);
  letter-spacing:-.04em;
  transition:color .25s var(--ease);
}
.section.is-current .section-num{color:rgba(47,230,208,.14)}
.section-title{font-size:clamp(1.25rem,2.2vw,1.75rem);font-weight:800;letter-spacing:-.02em;margin:0}
.section-sub{color:var(--muted);font-size:.9rem;flex:1 1 220px;min-width:0}
.kicker{font-family:var(--font-mono);font-size:.74rem;font-weight:700;letter-spacing:.18em;color:var(--accent);margin:0 0 10px}
.lede{color:var(--muted);font-size:1.03rem;line-height:1.85;max-width:38em}

.grid{display:grid;gap:clamp(16px,2.4vw,26px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid--split{display:grid;gap:clamp(18px,3vw,34px);grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:start}
.grid--split-rev{display:grid;gap:clamp(18px,3vw,34px);grid-template-columns:minmax(0,4fr) minmax(0,8fr);align-items:start}

.rule{height:1px;background:var(--line-600);border:0;margin-block:clamp(22px,3.5vw,42px)}

/* ---------- 5. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 22px;border-radius:var(--pill);
  font-size:.9rem;font-weight:700;letter-spacing:.03em;line-height:1.3;
  border:1px solid transparent;text-decoration:none;cursor:pointer;
  transition:transform .16s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:linear-gradient(115deg,var(--cyan),#1EB5A5);color:#04211F;box-shadow:0 16px 32px -20px rgba(47,230,208,.95)}
.btn--primary:hover{color:#04211F;box-shadow:0 20px 40px -20px rgba(47,230,208,1)}
.btn--gold{background:linear-gradient(115deg,var(--gold),#D69B20);color:#241A02;box-shadow:0 16px 32px -20px rgba(242,193,78,.9)}
.btn--gold:hover{color:#241A02}
.btn--ghost{background:transparent;border-color:var(--line-600);color:var(--text)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--text);box-shadow:var(--glow)}
.btn--block{width:100%}

/* ---------- 6. Panels / tags / data ---------- */
.panel{
  position:relative;
  background:linear-gradient(158deg,var(--ink-800),#0D1B2E 78%);
  border:1px solid var(--line-600);
  border-radius:var(--r-lg);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:var(--shadow-card);
}
.panel--flush{padding:0;overflow:hidden}
.panel--soft{background:linear-gradient(158deg,var(--ink-700),#12233A)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-bottom:14px}
.panel-title{font-size:1.02rem;font-weight:800;margin:0;letter-spacing:-.01em}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--pill);
  font-family:var(--font-mono);font-size:.74rem;font-weight:700;letter-spacing:.02em;
  background:var(--ink-700);border:1px solid var(--line-600);color:var(--muted);
  white-space:nowrap;
}
.tag--cyan{border-color:rgba(47,230,208,.5);color:var(--cyan);background:rgba(47,230,208,.08)}
.tag--gold{border-color:rgba(242,193,78,.5);color:var(--gold);background:rgba(242,193,78,.08)}
.tag--alert{border-color:rgba(255,107,74,.5);color:var(--alert);background:rgba(255,107,74,.08)}
.tag--ok{border-color:rgba(61,220,151,.5);color:var(--ok);background:rgba(61,220,151,.08)}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}

.data-band{
  position:relative;z-index:1;
  border-block:1px solid var(--line-600);
  background:
    linear-gradient(90deg,rgba(47,230,208,.10),rgba(242,193,78,.06) 52%,rgba(255,107,74,.04) 100%),
    var(--ink-850);
}
.data-band-inner{
  display:flex;flex-wrap:wrap;gap:clamp(18px,4vw,54px);
  padding-block:clamp(18px,2.6vw,28px);
}
.data-cell{min-width:130px}
.data-value{display:block;font-size:clamp(1.35rem,2.4vw,1.9rem);font-weight:700;color:var(--gold);line-height:1.2}
.data-value--cyan{color:var(--cyan)}
.data-value--alert{color:var(--alert)}
.data-label{display:block;margin-top:6px;font-size:.75rem;color:var(--muted);letter-spacing:.08em}

/* ---------- 7. Media frames ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-lg);
  border:1px solid var(--line-600);
  aspect-ratio:16/9;
  background:
    radial-gradient(120% 90% at 18% 12%,rgba(47,230,208,.16),transparent 58%),
    radial-gradient(90% 80% at 88% 92%,rgba(242,193,78,.12),transparent 60%),
    linear-gradient(140deg,var(--ink-800),var(--ink-900));
}
.media-frame::after{
  content:"";
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(47,230,208,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(47,230,208,.07) 1px,transparent 1px);
  background-size:28px 28px;
  opacity:.6;
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.media-caption{margin-top:10px;font-family:var(--font-mono);font-size:.76rem;color:var(--muted)}

/* ---------- 8. Breadcrumb ---------- */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.78rem;color:var(--muted);
  padding-top:clamp(18px,3vw,32px);
}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--cyan)}
.crumb-sep{color:var(--line-600)}
.crumb [aria-current="page"]{color:var(--gold)}

/* ---------- 9. Skip link ---------- */
.skip-link{
  position:fixed;left:50%;top:-140px;transform:translateX(-50%);
  z-index:400;padding:12px 24px;border-radius:0 0 var(--r-md) var(--r-md);
  background:var(--cyan);color:#03211F;font-weight:800;font-size:.9rem;letter-spacing:.02em;
  transition:top .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:0;color:#03211F;text-decoration:none;outline-offset:-3px}

/* ---------- 10. Header (framed left rail) ---------- */
.site-header{
  position:fixed;
  top:0;left:0;bottom:0;
  width:var(--rail);
  z-index:80;
  display:flex;
  flex-direction:column;
  padding:26px 20px 22px;
  background:
    radial-gradient(120% 55% at 0% 0%,rgba(47,230,208,.12),transparent 62%),
    linear-gradient(180deg,var(--ink-850) 0%,var(--ink-900) 58%,#07101C 100%);
  border-right:1px solid var(--line-600);
  overflow-y:auto;
  overscroll-behavior:contain;
}
.site-header::before{
  content:"";
  position:absolute;top:0;right:0;width:1px;height:100%;
  background:linear-gradient(180deg,var(--accent),transparent 42%,var(--gold) 72%,transparent);
  opacity:.4;
  transition:background .4s var(--ease);
}
.header-shell{
  display:flex;flex-direction:column;gap:24px;
  min-height:100%;
}

/* brand */
.brand{display:flex}
.brand-link{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand-link:hover{text-decoration:none}
.brand-glyph{
  flex:0 0 auto;
  width:44px;height:44px;border-radius:var(--r-md);
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--cyan),var(--gold));
  color:#062230;font-size:1.3rem;font-weight:900;line-height:1;
  box-shadow:0 12px 30px -18px rgba(47,230,208,.95);
}
.brand-text{display:block;min-width:0}
.brand-name{display:block;font-size:1.08rem;font-weight:900;letter-spacing:.02em;color:var(--text);line-height:1.3}
.brand-line{display:block;margin-top:3px;font-size:.7rem;line-height:1.5;color:var(--muted);letter-spacing:.03em}

/* nav */
.site-nav{display:flex;flex-direction:column;gap:16px;flex:1 1 auto}
.nav-list{display:flex;flex-direction:column;gap:3px}
.nav-link{
  position:relative;
  display:flex;align-items:center;gap:12px;
  padding:10px 14px;
  border-radius:var(--r-md);
  border:1px solid transparent;
  color:var(--muted);
  font-size:.94rem;font-weight:600;line-height:1.4;
  text-decoration:none;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link:hover{color:var(--text);background:var(--ink-700);border-color:var(--line-600);text-decoration:none}
.nav-num{font-family:var(--font-mono);font-size:.72rem;font-weight:700;letter-spacing:.06em;color:var(--line-600);transition:color .18s var(--ease)}
.nav-link:hover .nav-num{color:var(--cyan)}
.nav-link[aria-current="page"]{
  color:var(--text);
  background:linear-gradient(90deg,rgba(47,230,208,.16),rgba(47,230,208,.02));
  border-color:rgba(47,230,208,.5);
}
.nav-link[aria-current="page"] .nav-num{color:var(--cyan)}
.nav-link[aria-current="page"]::before{
  content:"";
  position:absolute;left:-20px;top:50%;transform:translateY(-50%);
  width:3px;height:22px;border-radius:0 3px 3px 0;
  background:var(--cyan);
  box-shadow:0 0 14px rgba(47,230,208,.85);
}

/* tools */
.header-tools{display:flex;flex-wrap:wrap;gap:6px;padding-top:14px;border-top:1px dashed var(--line-600)}
.tool-link{
  display:inline-flex;align-items:center;
  padding:4px 11px;border-radius:var(--pill);
  border:1px solid var(--line-600);
  background:var(--ink-800);
  font-size:.74rem;font-weight:700;letter-spacing:.02em;
  color:var(--muted);
  transition:color .18s var(--ease),border-color .18s var(--ease)
}
.tool-link:hover{color:var(--cyan);border-color:rgba(47,230,208,.55);text-decoration:none}

/* cta */
.header-cta{margin-top:auto;padding-top:18px;border-top:1px dashed var(--line-600);display:flex;flex-direction:column}

/* toggle */
.nav-toggle{
  display:none;
  align-items:center;gap:10px;
  padding:9px 16px 9px 13px;
  border-radius:var(--pill);
  border:1px solid var(--line-600);
  background:var(--ink-800);
  color:var(--text);
  font-size:.82rem;font-weight:700;letter-spacing:.06em;
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);box-shadow:var(--glow)}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars i{display:block;height:2px;border-radius:2px;background:var(--cyan);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)}

/* progress rail */
.rail-progress{
  position:absolute;top:0;right:0;width:2px;height:100%;
  background:rgba(30,51,80,.6);
  overflow:hidden;
  pointer-events:none;
}
.rail-progress-fill{
  display:block;width:100%;
  height:calc(var(--progress,0) * 1%);
  background:linear-gradient(180deg,var(--accent),var(--gold));
  box-shadow:0 0 12px rgba(47,230,208,.7);
  transition:height .08s linear;
}

/* ---------- 11. Footer ---------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(46px,7vw,96px);
  padding-block:clamp(36px,5vw,64px) 26px;
  border-top:1px solid var(--line-600);
  background:
    radial-gradient(90% 130% at 100% 0%,rgba(242,193,78,.08),transparent 62%),
    radial-gradient(70% 120% at 0% 100%,rgba(47,230,208,.07),transparent 60%),
    linear-gradient(180deg,var(--ink-850),#07101C);
}
.footer-frame{
  display:grid;
  gap:clamp(26px,3.4vw,48px);
  grid-template-columns:minmax(0,1fr) minmax(0,2fr);
  align-items:start;
}
.footer-mark{
  font-size:1.35rem;font-weight:900;letter-spacing:-.01em;color:var(--text);
  margin-bottom:8px;
}
.footer-mark::before{
  content:"";display:inline-block;width:9px;height:9px;border-radius:3px;
  background:var(--cyan);margin-right:10px;vertical-align:middle;
  box-shadow:0 0 14px rgba(47,230,208,.9);
}
.footer-tag{font-family:var(--font-mono);font-size:.76rem;color:var(--gold);letter-spacing:.04em;margin-bottom:12px}
.footer-note{font-size:.86rem;line-height:1.8;color:var(--muted);max-width:30em}

.footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));gap:clamp(18px,2.4vw,30px)}
.footer-col-title{
  font-family:var(--font-mono);font-size:.74rem;font-weight:700;
  letter-spacing:.16em;color:var(--muted);
  margin:0 0 12px;padding-bottom:10px;
  border-bottom:1px solid var(--line-600);
}
.footer-list{display:flex;flex-direction:column;gap:8px}
.footer-list a{font-size:.88rem;color:rgba(232,241,255,.82);text-decoration:none;transition:color .18s var(--ease),padding-left .18s var(--ease)}
.footer-list a:hover{color:var(--cyan);padding-left:4px;text-decoration:none}

.footer-contact{grid-column:1 / -1;padding-top:22px;border-top:1px dashed var(--line-600)}
.footer-contact-line{font-size:.84rem;color:var(--muted);line-height:2.1;margin:0}
.footer-contact-line .mono{color:var(--gold)}
.footer-contact-note{margin-top:8px;font-size:.78rem;color:rgba(154,174,198,.75)}

.footer-bottom{
  grid-column:1 / -1;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  padding-top:20px;border-top:1px solid var(--line-600);
}
.footer-bottom-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-bottom-links a{font-size:.82rem;color:var(--muted)}
.footer-bottom-links a:hover{color:var(--cyan)}
.footer-legal{font-family:var(--font-mono);font-size:.76rem;color:rgba(154,174,198,.8);margin:0}

/* ---------- 12. Utility / motion ---------- */
.to-top{
  position:fixed;right:22px;bottom:26px;z-index:90;
  width:44px;height:44px;border-radius:var(--pill);
  display:grid;place-items:center;
  background:rgba(16,31,53,.94);
  border:1px solid var(--line-600);
  color:var(--cyan);font-size:1.05rem;line-height:1;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{border-color:var(--cyan);box-shadow:var(--glow)}

[data-reveal].is-pending{opacity:0;transform:translateY(14px)}
[data-reveal].is-visible{animation:revealUp .38s var(--ease) both}
@keyframes revealUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* ---------- 13. Desktop offset ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail)}
}

/* ---------- 14. Tablet & mobile ---------- */
@media (max-width:1023px){
  body::before{background-size:48px 48px}

  .site-header{
    position:sticky;top:0;left:0;right:0;bottom:auto;
    width:100%;height:auto;
    padding:12px 16px 10px;
    border-right:0;
    border-bottom:1px solid var(--line-600);
    overflow:visible;
    background:rgba(10,21,38,.94);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
  }
  .site-header::before{display:none}
  .header-shell{
    display:grid;
    grid-template-columns:minmax(0,1fr) auto;
    align-items:center;
    gap:12px;
    min-height:0;
  }
  .brand-line{display:none}
  .brand-glyph{width:38px;height:38px;border-radius:12px;font-size:1.15rem}
  .brand-name{font-size:1rem}

  .nav-toggle{display:inline-flex;justify-self:end}

  .site-nav{display:none;grid-column:1 / -1;gap:12px;flex:none}
  .site-header[data-open] .site-nav{
    display:flex;
    padding-top:14px;
    border-top:1px solid var(--line-600);
    max-height:calc(100vh - 190px);
    overflow-y:auto;
    animation:drawerIn .2s var(--ease);
  }
  @keyframes drawerIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
  .nav-link{padding:11px 14px}
  .nav-link[aria-current="page"]::before{left:-16px}

  .header-cta{display:none}
  .site-header[data-open] .header-cta{
    display:flex;grid-column:1 / -1;
    margin-top:0;padding-top:14px;
    border-top:1px dashed var(--line-600);
  }

  .rail-progress{
    top:auto;bottom:0;left:0;right:0;
    width:100%;height:2px;
    background:rgba(30,51,80,.7);
  }
  .rail-progress-fill{
    height:100%;
    width:calc(var(--progress,0) * 1%);
    background:linear-gradient(90deg,var(--accent),var(--gold));
  }

  .grid--split,.grid--split-rev{grid-template-columns:minmax(0,1fr)}
  .footer-frame{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .to-top{right:16px;bottom:20px}
}

@media (max-width:640px){
  :root{--pad-x:18px}
  body{line-height:1.82}
  .data-band-inner{gap:16px 26px}
  .data-cell{min-width:calc(50% - 13px)}
  .footer-cols{grid-template-columns:repeat(auto-fit,minmax(132px,1fr))}
  .footer-contact-line{line-height:1.9}
}

/* ---------- 15. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal].is-pending{opacity:1;transform:none}
  .to-top{transition:none}
}

/* ---------- 16. Print ---------- */
@media print{
  .site-header,.to-top,.skip-link{display:none !important}
  body{padding-left:0;background:#fff;color:#000}
  body::before{display:none}
}