/* ==========================================================================
   天天娱乐会馆 · 全站共享样式 /assets/site.css
   深夜霓虹 · 数据叙事 · 极细边界
   ========================================================================== */

:root{
  /* 色彩系统 */
  --ink-900:#08060F;
  --ink-800:#100A22;
  --ink-700:#1A1038;
  --ink-600:#2B1A55;
  --neon-violet:#A44BFF;
  --electric-blue:#33D9FF;
  --warm-gold:#FFC24B;
  --coral:#FF6B5A;
  --text-primary:#F5F2FF;
  --text-muted:#A79FC7;
  --glow-violet:rgba(164,75,255,.35);
  --glow-blue:rgba(51,217,255,.28);

  /* 尺寸与节奏 */
  --shell:1180px;
  --gutter:clamp(16px,4vw,40px);
  --radius-pill:999px;
  --radius-card:16px;
  --radius-soft:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:180ms;

  /* 字体 */
  --font-display:"Archivo Black","Anton","Noto Sans SC","Source Han Sans SC",system-ui,sans-serif;
  --font-sans:Inter,"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Consolas,"Courier New",monospace;
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}

body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:1rem;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--text-primary);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 620px at 10% -12%, rgba(164,75,255,.20), transparent 62%),
    radial-gradient(900px 520px at 94% 2%, rgba(51,217,255,.14), transparent 58%),
    radial-gradient(760px 700px at 50% 118%, rgba(255,107,90,.10), transparent 60%);
  background-repeat:no-repeat;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

main{display:block}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0}
figure,blockquote{margin:0}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.01em;
  text-wrap:balance;
}
p{text-wrap:pretty}

::selection{background:rgba(164,75,255,.4);color:var(--text-primary)}

/* --------------------------------------------------------- 可访问性 --- */
:focus-visible{
  outline:2px solid var(--electric-blue);
  outline-offset:2px;
  border-radius:6px;
}

.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;border:0;
}

.skip-link{
  position:absolute;
  top:10px;left:50%;
  transform:translate(-50%,-160%);
  z-index:200;
  padding:10px 20px;
  border-radius:var(--radius-pill);
  border:1px solid var(--electric-blue);
  background:var(--ink-800);
  color:var(--text-primary);
  font-size:.875rem;font-weight:600;
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{
  transform:translate(-50%,0);
}

/* ----------------------------------------------------- 主内容顶部留白 --- */
#main-content{
  padding-top:clamp(96px,13vw,130px);
}

/* ------------------------------------------------------------- 容器 --- */
.container{
  width:min(calc(100% - (var(--gutter) * 2)), var(--shell));
  margin-inline:auto;
}

.section{
  padding-block:clamp(44px,7vw,88px);
}

/* ==========================================================================
   悬浮胶囊导航
   ========================================================================== */
.site-header{
  position:fixed;
  top:14px;
  left:50%;
  transform:translateX(-50%);
  width:min(calc(100% - (var(--gutter) * 2)), var(--shell));
  z-index:90;
  transition:top var(--dur) var(--ease);
}

.site-header__inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,24px);
  padding:8px 10px 8px 18px;
  border:1px solid var(--ink-600);
  border-radius:var(--radius-pill);
  background:linear-gradient(120deg, rgba(16,10,34,.90), rgba(8,6,15,.86));
  backdrop-filter:blur(16px) saturate(150%);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  box-shadow:0 12px 34px rgba(0,0,0,.5), inset 0 0 0 1px rgba(164,75,255,.06);
  transition:background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), padding var(--dur) var(--ease);
}

.site-header[data-elevated="true"]{top:8px}

.site-header[data-elevated="true"] .site-header__inner{
  background:linear-gradient(120deg, rgba(16,10,34,.97), rgba(8,6,15,.95));
  padding-block:5px;
  box-shadow:0 16px 44px rgba(0,0,0,.62), 0 0 22px rgba(164,75,255,.14);
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  padding:4px 6px 4px 0;
  border-radius:var(--radius-pill);
}

.brand__mark{
  width:26px;height:26px;
  border-radius:9px;
  background:linear-gradient(140deg,var(--neon-violet),var(--electric-blue) 62%,var(--coral));
  box-shadow:0 0 16px var(--glow-violet), inset 0 0 0 1px rgba(245,242,255,.24);
  position:relative;
}
.brand__mark::after{
  content:"";
  position:absolute;inset:8px;
  border-radius:3px;
  background:var(--ink-900);
  opacity:.82;
}

.brand__text{
  display:flex;
  flex-direction:column;
  line-height:1.1;
}
.brand__name{
  font-family:var(--font-display);
  font-size:1rem;
  font-weight:900;
  letter-spacing:.02em;
  color:var(--text-primary);
  white-space:nowrap;
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:.5625rem;
  letter-spacing:.22em;
  color:var(--electric-blue);
  text-transform:uppercase;
}

.brand--footer{margin-bottom:14px}
.brand--footer .brand__name{font-size:1.0625rem}

/* 导航 */
.site-nav{
  flex:1 1 auto;
  display:flex;
  justify-content:center;
}

.site-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
}

.site-nav__link{
  display:inline-flex;
  align-items:center;
  padding:8px 13px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-size:.875rem;
  font-weight:500;
  color:var(--text-muted);
  white-space:nowrap;
  transition:
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.site-nav__link:hover{
  color:var(--text-primary);
  background:rgba(164,75,255,.12);
  border-color:rgba(164,75,255,.36);
}
.site-nav__link[aria-current="page"]{
  color:var(--text-primary);
  font-weight:600;
  background:linear-gradient(135deg, rgba(164,75,255,.26), rgba(51,217,255,.14));
  border-color:rgba(164,75,255,.55);
  box-shadow:0 0 16px var(--glow-violet);
}

.site-nav__foot{display:none}

/* 右侧按钮组 */
.header-actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  width:42px;height:42px;
  border:1px solid var(--ink-600);
  border-radius:var(--radius-pill);
  background:rgba(43,26,85,.42);
  cursor:pointer;
  transition:border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:rgba(51,217,255,.55);background:rgba(51,217,255,.10)}
.nav-toggle__bar{
  display:block;
  width:16px;height:2px;
  border-radius:2px;
  background:var(--text-primary);
  transition:transform var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:9px 17px;
  border:1px solid var(--ink-600);
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--text-primary);
  font-size:.875rem;
  font-weight:600;
  letter-spacing:.02em;
  white-space:nowrap;
  cursor:pointer;
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    color var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-2px)}

.btn--violet{
  border-color:rgba(164,75,255,.72);
  background:linear-gradient(135deg, rgba(164,75,255,.20), rgba(51,217,255,.10));
}
.btn--violet:hover{
  border-color:var(--neon-violet);
  background:linear-gradient(135deg, rgba(164,75,255,.36), rgba(51,217,255,.18));
  box-shadow:0 0 20px var(--glow-violet);
}

.btn--coral{
  border-color:rgba(255,107,90,.72);
  background:linear-gradient(135deg, rgba(255,107,90,.16), rgba(255,194,75,.08));
}
.btn--coral:hover{
  border-color:var(--coral);
  background:linear-gradient(135deg, rgba(255,107,90,.34), rgba(255,194,75,.14));
  box-shadow:0 0 20px rgba(255,107,90,.30);
}

.btn--solid{
  border-color:transparent;
  background:linear-gradient(135deg,var(--neon-violet),var(--electric-blue));
  color:#08060F;
  font-weight:700;
}
.btn--solid:hover{box-shadow:0 0 24px var(--glow-violet)}

.btn--block{width:100%}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,110px);
  border-top:1px solid var(--ink-600);
  background:linear-gradient(180deg, rgba(16,10,34,.72), var(--ink-900) 62%);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset-inline:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(164,75,255,.75),rgba(51,217,255,.6),transparent);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.7fr;
  gap:clamp(24px,4vw,52px);
  padding-block:clamp(44px,6vw,76px) clamp(26px,4vw,44px);
}

.footer-col{min-width:0}

.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--electric-blue);
}

.footer-col__list{display:grid;gap:9px}
.footer-col__list a{
  display:inline-block;
  font-size:.9375rem;
  color:var(--text-muted);
  transition:color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.footer-col__list a:hover{
  color:var(--text-primary);
  transform:translateX(2px);
}

.footer-note{
  max-width:26ch;
  font-size:.9375rem;
  color:var(--text-muted);
}

.footer-icp{
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.04em;
  color:rgba(167,159,199,.7);
}

/* 联系信息 */
.footer-contact{display:grid;gap:12px;margin-top:2px}
.footer-contact__row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 10px;
  font-size:.9375rem;
}
.footer-contact__label{
  min-width:56px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--warm-gold);
}
.footer-contact__value{
  color:var(--text-muted);
  word-break:break-word;
}
.footer-contact__value.mono{
  font-family:var(--font-mono);
  font-size:.875rem;
  letter-spacing:.02em;
  color:var(--text-primary);
}
.footer-contact__hint{
  margin-top:14px;
  padding-left:14px;
  border-left:2px solid var(--neon-violet);
  font-size:.8125rem;
  line-height:1.7;
  color:var(--text-muted);
}

.copy-btn{
  padding:3px 10px;
  border:1px solid var(--ink-600);
  border-radius:var(--radius-pill);
  background:rgba(43,26,85,.40);
  color:var(--text-muted);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  cursor:pointer;
  transition:
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}
.copy-btn:hover{
  color:var(--electric-blue);
  border-color:rgba(51,217,255,.55);
  background:rgba(51,217,255,.10);
}
.copy-btn[data-copied="true"]{
  color:var(--warm-gold);
  border-color:rgba(255,194,75,.62);
  background:rgba(255,194,75,.12);
}

/* 底行 */
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
  padding-block:18px clamp(20px,3vw,30px);
  border-top:1px dashed var(--ink-600);
  font-size:.8125rem;
  color:var(--text-muted);
}
.footer-bottom__copy{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-legal a{
  color:var(--text-muted);
  transition:color var(--dur) var(--ease);
}
.footer-legal a:hover{color:var(--electric-blue)}

/* ==========================================================================
   章节骨架
   ========================================================================== */
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px 32px;
  padding-bottom:18px;
  margin-bottom:clamp(24px,4vw,42px);
  border-bottom:1px solid var(--ink-600);
}

.section__head-main{min-width:0}

.chapter-no{
  display:block;
  margin-bottom:6px;
  font-family:var(--font-mono);
  font-size:clamp(1.75rem,4.6vw,3rem);
  font-weight:700;
  line-height:1;
  letter-spacing:.02em;
  color:var(--warm-gold);
  -webkit-text-stroke:1px rgba(255,194,75,.42);
  text-shadow:0 0 22px rgba(255,194,75,.22);
}

.eyebrow{
  display:block;
  margin-bottom:8px;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--electric-blue);
}

.section__title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.5rem,3.2vw,2.35rem);
  letter-spacing:.01em;
}

.lede{
  max-width:62ch;
  color:var(--text-muted);
  font-size:1rem;
}

.note{
  padding:14px 0 14px 18px;
  border-left:2px solid var(--neon-violet);
  color:var(--text-muted);
  font-size:.9375rem;
}

/* 面包屑 */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--text-muted);
}
.breadcrumbs a{
  color:var(--text-muted);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumbs a:hover{
  color:var(--electric-blue);
  border-bottom-color:rgba(51,217,255,.6);
}
.breadcrumbs__sep{opacity:.45}

/* ==========================================================================
   网格
   ========================================================================== */
.grid{display:grid;gap:clamp(18px,2.6vw,32px)}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--4-8{grid-template-columns:4fr 8fr}
.grid--3-6-3{grid-template-columns:3fr 6fr 3fr}
.grid--auto{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}

.stack{display:flex;flex-direction:column;gap:14px}
.cluster{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* ==========================================================================
   卡片与信息块
   ========================================================================== */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--ink-600);
  border-radius:var(--radius-card);
  background:linear-gradient(160deg, rgba(26,16,56,.86), rgba(16,10,34,.90));
  transition:
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.card::before{
  content:"";
  position:absolute;
  inset-inline:0;top:0;height:1px;
  border-radius:var(--radius-card) var(--radius-card) 0 0;
  background:linear-gradient(90deg,transparent,rgba(164,75,255,.5),transparent);
  opacity:0;
  transition:opacity var(--dur) var(--ease);
}
.card:hover{
  border-color:rgba(164,75,255,.5);
  transform:translateY(-2px);
  box-shadow:0 10px 30px rgba(8,6,15,.6), 0 0 22px rgba(164,75,255,.18);
}
.card:hover::before{opacity:1}

.card--glow{
  box-shadow:0 0 0 1px rgba(164,75,255,.16), 0 0 26px rgba(164,75,255,.18);
}

.card__title{
  font-size:1.125rem;
  font-weight:700;
  margin-bottom:8px;
}

/* 指标 */
.stat{display:flex;flex-direction:column;gap:4px}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(1.5rem,3vw,2.25rem);
  font-weight:700;
  line-height:1.1;
  color:var(--text-primary);
  text-shadow:0 0 20px var(--glow-violet);
}
.stat__label{
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--text-muted);
}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border:1px solid var(--ink-600);
  border-radius:var(--radius-pill);
  background:rgba(43,26,85,.38);
  color:var(--text-muted);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.tag--violet{color:#D9BAFF;border-color:rgba(164,75,255,.55);background:rgba(164,75,255,.14)}
.tag--blue{color:#A9ECFF;border-color:rgba(51,217,255,.5);background:rgba(51,217,255,.12)}
.tag--gold{color:#FFD98B;border-color:rgba(255,194,75,.5);background:rgba(255,194,75,.12)}
.tag--coral{color:#FFB3A8;border-color:rgba(255,107,90,.5);background:rgba(255,107,90,.12)}

/* 图例 */
.legend{display:flex;flex-wrap:wrap;gap:10px 20px}
.legend__item{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:.875rem;
  color:var(--text-muted);
}
.legend__dot{
  width:10px;height:10px;
  border-radius:3px;
  background:var(--neon-violet);
  box-shadow:0 0 12px currentColor;
  color:var(--glow-violet);
  flex:0 0 auto;
}
.legend__item--blue .legend__dot{background:var(--electric-blue);color:var(--glow-blue)}
.legend__item--gold .legend__dot{background:var(--warm-gold);color:rgba(255,194,75,.4)}
.legend__item--coral .legend__dot{background:var(--coral);color:rgba(255,107,90,.4)}

/* 时间轴（坐标索引） */
.timeline{
  position:relative;
  padding-left:26px;
  border-left:1px solid var(--ink-600);
}
.timeline__item{
  position:relative;
  padding-bottom:24px;
}
.timeline__item:last-child{padding-bottom:0}
.timeline__item::before{
  content:"";
  position:absolute;
  left:-32px;top:6px;
  width:10px;height:10px;
  border-radius:50%;
  background:var(--ink-900);
  border:2px solid var(--electric-blue);
  box-shadow:0 0 10px rgba(51,217,255,.55);
}
.timeline__time{
  display:block;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.08em;
  color:var(--warm-gold);
}
.timeline__text{
  margin-top:2px;
  font-size:.9375rem;
  color:var(--text-muted);
}

/* 可展开记录条目 */
.entry{
  border:1px solid var(--ink-600);
  border-radius:var(--radius-soft);
  background:rgba(26,16,56,.5);
  overflow:hidden;
  transition:border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.entry:hover{border-color:rgba(51,217,255,.45)}
.entry[data-open="true"]{
  border-color:rgba(164,75,255,.55);
  box-shadow:0 0 20px rgba(164,75,255,.16);
}
.entry__head{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  padding:13px 16px;
  border:0;
  background:transparent;
  text-align:left;
  cursor:pointer;
}
.entry__no{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.06em;
  color:var(--electric-blue);
  flex:0 0 auto;
}
.entry__title{
  flex:1 1 auto;
  min-width:0;
  font-size:.9375rem;
  font-weight:600;
  color:var(--text-primary);
}
.entry__meta{
  font-family:var(--font-mono);
  font-size:.75rem;
  color:var(--text-muted);
  flex:0 0 auto;
}
.entry__chev{
  flex:0 0 auto;
  font-size:.75rem;
  color:var(--text-muted);
  transition:transform var(--dur) var(--ease), color var(--dur) var(--ease);
}
.entry[data-open="true"] .entry__chev{transform:rotate(90deg);color:var(--warm-gold)}
.entry__body{
  display:none;
  margin:0 16px 14px;
  padding-top:12px;
  border-top:1px dashed var(--ink-600);
  font-size:.875rem;
  color:var(--text-muted);
}
.entry[data-open="true"] .entry__body{display:block}

/* ==========================================================================
   切换与筛选
   ========================================================================== */
.chip-bar,
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}

.chip{
  appearance:none;
  padding:7px 15px;
  border:1px solid var(--ink-600);
  border-radius:var(--radius-pill);
  background:rgba(26,16,56,.6);
  color:var(--text-muted);
  font-size:.875rem;
  cursor:pointer;
  transition:
    background-color 120ms var(--ease),
    color 120ms var(--ease),
    border-color 120ms var(--ease),
    box-shadow 120ms var(--ease);
}
.chip:hover{
  color:var(--text-primary);
  border-color:rgba(51,217,255,.5);
}
.chip[aria-selected="true"],
.chip[aria-pressed="true"]{
  color:#08060F;
  font-weight:700;
  border-color:transparent;
  background:linear-gradient(135deg,var(--electric-blue),var(--neon-violet));
  box-shadow:0 0 18px var(--glow-violet);
}

.tab-panel[hidden]{display:none}

/* ==========================================================================
   图片容器（页面阶段放置图片）
   ========================================================================== */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--ink-600);
  border-radius:var(--radius-card);
  background:linear-gradient(150deg, rgba(43,26,85,.55), rgba(8,6,15,.9));
}
.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:3 / 4}

.media-frame__placeholder{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:18px;
  text-align:center;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--text-muted);
  background-image:
    radial-gradient(circle at 28% 28%, rgba(164,75,255,.24), transparent 62%),
    radial-gradient(circle at 76% 72%, rgba(51,217,255,.18), transparent 58%),
    radial-gradient(circle at 50% 110%, rgba(255,107,90,.14), transparent 60%);
}
.media-frame__caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.04em;
  color:var(--text-muted);
}

/* ==========================================================================
   工具类与动效
   ========================================================================== */
.mono{
  font-family:var(--font-mono);
  font-size:.875rem;
  letter-spacing:.02em;
}

.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:.9375rem;
  font-weight:600;
  color:var(--electric-blue);
  transition:color var(--dur) var(--ease);
}
.link-arrow::after{
  content:"→";
  transition:transform var(--dur) var(--ease);
}
.link-arrow:hover{color:var(--text-primary)}
.link-arrow:hover::after{transform:translateX(3px)}

.divider{
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,transparent,var(--ink-600),transparent);
}

[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .42s var(--ease), transform .42s var(--ease);
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* 滚动进度线 */
.scroll-progress{
  position:fixed;
  top:0;left:0;
  width:100%;height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--neon-violet),var(--electric-blue) 55%,var(--warm-gold));
  z-index:120;
  pointer-events:none;
}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,28px);
  bottom:clamp(14px,3vw,28px);
  width:44px;height:44px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid var(--ink-600);
  border-radius:50%;
  background:linear-gradient(150deg, rgba(26,16,56,.95), rgba(8,6,15,.95));
  color:var(--text-primary);
  font-size:1rem;
  cursor:pointer;
  z-index:100;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) step-end, border-color var(--dur) var(--ease);
}
.to-top[data-visible="true"]{
  opacity:1;
  visibility:visible;
  transform:none;
  transition:opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility 0s, border-color var(--dur) var(--ease);
}
.to-top:hover{
  border-color:rgba(51,217,255,.6);
  box-shadow:0 0 18px rgba(51,217,255,.25);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:980px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col--brand{grid-column:1 / -1}
}

@media (max-width:1079px){
  .header-actions__wide{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    display:none;
    max-height:calc(100vh - 130px);
    overflow-y:auto;
    padding:14px;
    border:1px solid var(--ink-600);
    border-radius:22px;
    background:linear-gradient(165deg, rgba(26,16,56,.98), rgba(8,6,15,.98));
    box-shadow:0 26px 64px rgba(0,0,0,.62);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
  }
  .site-nav[data-open="true"]{display:block}

  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:4px;
  }
  .site-nav__link{
    padding:12px 14px;
    border-radius:var(--radius-soft);
    font-size:1rem;
  }
  .site-nav__foot{
    display:block;
    margin-top:12px;
    padding-top:14px;
    border-top:1px dashed var(--ink-600);
  }

  body.is-nav-open::before{
    content:"";
    position:fixed;
    inset:0;
    z-index:80;
    background:rgba(8,6,15,.74);
    backdrop-filter:blur(2px);
    -webkit-backdrop-filter:blur(2px);
  }
}

@media (max-width:900px){
  .grid--5-7,
  .grid--4-8,
  .grid--3-6-3{grid-template-columns:1fr}
}

@media (max-width:640px){
  :root{--gutter:18px}
  body{font-size:1rem}
  .footer-grid{grid-template-columns:1fr}
  .brand__tag{display:none}
  .footer-bottom{
    flex-direction:column;
    align-items:flex-start;
  }
  .entry__head{flex-wrap:wrap;gap:8px 12px}
  .entry__title{flex:1 1 100%;order:3}
  .chapter-no{font-size:2rem}
}

/* ==========================================================================
   无障碍与动效降级
   ========================================================================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .btn:hover,
  .card:hover,
  .footer-col__list a:hover{transform:none}
  [data-reveal]{opacity:1;transform:none}
}