/* ===== 娱乐神殿HD · 共享样式 /assets/site.css ===== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--sd-header-h) + 16px);
}
html[data-nav-locked]{overflow:hidden}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
img,svg,video{display:block;max-width:100%}
button,input,select{font:inherit;color:inherit}
button{background:none;border:0}

/* ---------- 2. Tokens ---------- */
:root{
  --sd-obsidian:#0B0B10;
  --sd-rock:#161821;
  --sd-rock-lift:#1D2029;
  --sd-gold:#C8A24A;
  --sd-gold-bright:#F0D07A;
  --sd-violet:#7B4DFF;
  --sd-lava:#F2762E;
  --sd-jade:#2FB98A;
  --sd-ash:#8A8F9A;
  --sd-moss:#4C6B57;
  --sd-bone:#F2EDE4;

  --sd-ink:rgba(242,237,228,.78);
  --sd-ink-dim:rgba(242,237,228,.56);
  --sd-line:rgba(200,162,74,.24);
  --sd-line-soft:rgba(242,237,228,.10);
  --sd-shadow:0 22px 60px rgba(0,0,0,.55);

  --sd-font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --sd-font-body:"Inter","Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --sd-font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --sd-header-h:76px;
  --sd-header-h-sm:62px;
  --sd-shell:1200px;
  --sd-radius:14px;
  --sd-radius-lg:22px;
  --sd-ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. Base typography ---------- */
body{
  min-height:100vh;
  background-color:var(--sd-obsidian);
  background-image:
    radial-gradient(120% 58% at 50% -12%,rgba(200,162,74,.12),transparent 62%),
    radial-gradient(80% 46% at 50% 104%,rgba(47,185,138,.07),transparent 70%),
    radial-gradient(52% 34% at 88% 22%,rgba(123,77,255,.08),transparent 72%);
  background-repeat:no-repeat;
  color:var(--sd-bone);
  font-family:var(--sd-font-body);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--sd-font-display);
  font-weight:800;
  line-height:1.24;
  letter-spacing:.06em;
  color:var(--sd-bone);
}
a{color:var(--sd-gold-bright);text-decoration:none;transition:color .2s var(--sd-ease)}
a:not(.sd-btn):not(.sd-nav__link):not(.sd-brand):hover{color:var(--sd-violet)}
strong{font-weight:600;color:var(--sd-gold-bright)}
code,kbd{font-family:var(--sd-font-mono);font-size:.9em;color:var(--sd-gold-bright)}
::selection{background:rgba(200,162,74,.32);color:var(--sd-bone)}
:focus-visible{outline:2px solid var(--sd-gold-bright);outline-offset:3px;border-radius:5px}

.sd-num{font-family:var(--sd-font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

/* ---------- 4. Layout helpers ---------- */
.sd-shell{width:min(var(--sd-shell),100% - 2.5rem);margin-inline:auto}
.sd-narrow{width:min(680px,100% - 2.5rem);margin-inline:auto}
.sd-main{padding-top:var(--sd-header-h)}
.sd-main--flush{padding-top:0}
.sd-section{padding:clamp(3rem,7vw,5.5rem) 0}
.sd-section--tight{padding:clamp(1.8rem,4vw,2.8rem) 0}
.sd-prose{max-width:68ch}
.sd-prose p{margin:0 0 1.2em}
.sd-prose h2{margin:2.2em 0 .7em;font-size:clamp(1.4rem,2.6vw,1.9rem)}
.sd-prose h3{margin:1.8em 0 .6em;font-size:1.14rem;letter-spacing:.08em}
.sd-prose ul,.sd-prose ol{margin:0 0 1.2em;padding-left:1.4em}
.sd-prose ul{list-style:square}
.sd-prose ol{list-style:decimal}
.sd-prose li{margin-bottom:.5em}
.sd-prose a{color:var(--sd-bone);border-bottom:1px solid var(--sd-violet);padding-bottom:1px}
.sd-prose a:hover{color:var(--sd-violet)}
.sd-prose blockquote{margin:0 0 1.2em;padding:.2em 0 .2em 1.2em;border-left:2px solid var(--sd-gold);color:var(--sd-ink)}

.sd-eyebrow{
  display:block;margin:0 0 .9rem;
  font-family:var(--sd-font-mono);
  font-size:.72rem;letter-spacing:.28em;text-transform:uppercase;
  color:var(--sd-gold);
}
.sd-lede{font-size:clamp(1rem,1.6vw,1.16rem);line-height:1.72;color:var(--sd-ink);max-width:58ch}
.sd-note{margin:0;font-size:.76rem;letter-spacing:.08em;color:var(--sd-ash)}
.sd-rule{border:0;height:1px;margin:clamp(1.4rem,3vw,2.4rem) 0;
  background:linear-gradient(90deg,var(--sd-gold),rgba(200,162,74,.05) 70%,transparent)}

.sd-grid{display:grid;gap:clamp(1rem,2.6vw,1.7rem)}
.sd-grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.sd-grid--3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}

/* ---------- 5. Buttons ---------- */
.sd-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.74rem 1.4rem;
  border:1px solid var(--sd-gold);border-radius:999px;
  background:transparent;
  font-family:var(--sd-font-body);font-size:.88rem;font-weight:600;
  letter-spacing:.12em;line-height:1;color:var(--sd-gold-bright);
  cursor:pointer;white-space:nowrap;
  transition:background-color .24s var(--sd-ease),color .24s var(--sd-ease),
    border-color .24s var(--sd-ease),box-shadow .24s var(--sd-ease),transform .24s var(--sd-ease);
}
.sd-btn--gold{background:linear-gradient(180deg,rgba(200,162,74,.24),rgba(200,162,74,.06))}
.sd-btn--gold:hover,.sd-btn--gold:focus-visible{
  background:var(--sd-gold-bright);border-color:var(--sd-gold-bright);
  color:#14120C;box-shadow:0 0 28px rgba(240,208,122,.34);transform:translateY(-1px);
}
.sd-btn--solid{background:var(--sd-gold);color:#14120C;border-color:var(--sd-gold)}
.sd-btn--solid:hover,.sd-btn--solid:focus-visible{background:var(--sd-gold-bright);border-color:var(--sd-gold-bright)}
.sd-btn--ghost{border-color:var(--sd-line);color:var(--sd-bone)}
.sd-btn--ghost:hover,.sd-btn--ghost:focus-visible{border-color:var(--sd-violet);color:var(--sd-violet)}
.sd-btn--violet{border-color:var(--sd-violet);color:#CDBBFF}
.sd-btn--violet:hover,.sd-btn--violet:focus-visible{background:rgba(123,77,255,.16);color:#E2D9FF}
.sd-btn--sm{padding:.5rem .98rem;font-size:.78rem;letter-spacing:.1em}

/* ---------- 6. Skip link ---------- */
.sd-skip{
  position:fixed;top:.6rem;left:.6rem;z-index:200;
  padding:.6rem 1rem;border-radius:8px;
  background:var(--sd-gold-bright);color:#14120C;
  font-size:.84rem;font-weight:600;letter-spacing:.08em;
  transform:translateY(-160%);
  transition:transform .24s var(--sd-ease);
}
.sd-skip:focus{transform:translateY(0);color:#14120C}

/* ---------- 7. Header ---------- */
.sd-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .34s var(--sd-ease),border-color .34s var(--sd-ease);
}
.sd-header::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(11,11,16,.9),rgba(11,11,16,.35) 62%,transparent);
  opacity:1;transition:opacity .3s var(--sd-ease);
}
.sd-header.is-stuck{
  background:rgba(11,11,16,.95);
  border-bottom-color:var(--sd-line);
  backdrop-filter:blur(12px) saturate(120%);
  -webkit-backdrop-filter:blur(12px) saturate(120%);
  box-shadow:0 14px 40px rgba(0,0,0,.5);
}
.sd-header.is-stuck::after{opacity:0}
.sd-header__inner{
  position:relative;z-index:2;
  width:min(var(--sd-shell),100% - 2.5rem);
  margin-inline:auto;
  min-height:var(--sd-header-h);
  display:flex;align-items:center;justify-content:space-between;gap:1.2rem;
  transition:min-height .3s var(--sd-ease);
}
.sd-header.is-stuck .sd-header__inner{min-height:64px}

.sd-progress{position:absolute;left:0;right:0;bottom:0;height:2px;overflow:hidden;background:transparent;z-index:3}
.sd-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--sd-violet),var(--sd-gold) 55%,var(--sd-gold-bright));
  transition:transform .12s linear;
}

.sd-brand{display:inline-flex;align-items:center;gap:.72rem;color:var(--sd-bone);flex:0 0 auto}
.sd-brand:hover{color:var(--sd-bone)}
.sd-brand__glyph{
  position:relative;display:block;flex:0 0 auto;width:28px;height:36px;
  background:linear-gradient(180deg,var(--sd-gold-bright),var(--sd-gold) 46%,rgba(200,162,74,.18));
  clip-path:polygon(50% 0,100% 26%,100% 100%,0 100%,0 26%);
  box-shadow:0 0 20px rgba(200,162,74,.34);
}
.sd-brand__glyph::after{
  content:"";position:absolute;left:6px;right:6px;bottom:5px;height:15px;
  background:var(--sd-obsidian);
  clip-path:polygon(50% 0,100% 30%,100% 100%,0 100%,0 30%);
}
.sd-brand__text{display:flex;flex-direction:column;line-height:1.16}
.sd-brand__name{font-family:var(--sd-font-display);font-weight:900;font-size:1.06rem;letter-spacing:.14em}
.sd-brand__tag{font-size:.6rem;letter-spacing:.3em;color:var(--sd-gold);text-transform:uppercase}

.sd-burger{
  display:none;align-items:center;gap:.55rem;
  padding:.5rem .9rem;
  border:1px solid var(--sd-line);border-radius:999px;
  color:var(--sd-gold-bright);cursor:pointer;
  font-size:.74rem;font-weight:600;letter-spacing:.2em;
  transition:border-color .22s var(--sd-ease),color .22s var(--sd-ease);
}
.sd-burger:hover{border-color:var(--sd-gold-bright)}
.sd-burger__bars{display:inline-flex;flex-direction:column;gap:4px}
.sd-burger__bars span{display:block;width:15px;height:1.6px;background:currentColor;
  transition:transform .24s var(--sd-ease)}
.sd-burger[aria-expanded="true"] .sd-burger__bars span:first-child{transform:translateY(2.9px) rotate(45deg)}
.sd-burger[aria-expanded="true"] .sd-burger__bars span:last-child{transform:translateY(-2.9px) rotate(-45deg)}

.sd-nav{display:flex;align-items:center;gap:1.3rem}
.sd-nav__list{display:flex;align-items:center;gap:.2rem;list-style:none;margin:0;padding:0}
.sd-nav__link{
  position:relative;display:inline-block;
  padding:.55rem .68rem;
  font-size:.9rem;letter-spacing:.09em;
  color:rgba(242,237,228,.78);
}
.sd-nav__link::after{
  content:"";position:absolute;left:.68rem;right:.68rem;bottom:.26rem;height:1.5px;
  background:linear-gradient(90deg,var(--sd-gold),var(--sd-gold-bright));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .26s var(--sd-ease);
}
.sd-nav__link:hover,.sd-nav__link:focus-visible{color:var(--sd-gold-bright)}
.sd-nav__link:hover::after,.sd-nav__link:focus-visible::after{transform:scaleX(1)}
.sd-nav__link[aria-current="page"]{color:var(--sd-gold-bright)}
.sd-nav__link[aria-current="page"]::after{
  transform:scaleX(1);
  background:linear-gradient(90deg,var(--sd-violet),var(--sd-gold-bright));
}
.sd-nav__utility{
  display:flex;align-items:center;gap:.9rem;
  padding-left:1.1rem;border-left:1px solid var(--sd-line);
}
.sd-nav__util{font-size:.8rem;letter-spacing:.14em;color:var(--sd-ash)}
.sd-nav__util:hover,.sd-nav__util:focus-visible{color:var(--sd-violet)}

/* ---------- 8. Footer ---------- */
.sd-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(3rem,8vw,6rem);
  border-top:1px solid var(--sd-line);
  background:
    radial-gradient(120% 78% at 50% 0%,rgba(200,162,74,.11),transparent 62%),
    linear-gradient(180deg,#0F0F16 0%,#08080C 100%);
  color:var(--sd-ink);
}
.sd-footer::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:min(620px,86%);height:1px;
  background:linear-gradient(90deg,transparent,var(--sd-gold),transparent);
}
.sd-footer::after{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:min(700px,92%);height:190px;pointer-events:none;
  background:radial-gradient(62% 100% at 50% 0%,rgba(200,162,74,.13),transparent 72%);
}
.sd-footer__inner{
  position:relative;z-index:2;
  width:min(var(--sd-shell),100% - 2.5rem);
  margin-inline:auto;
  padding:clamp(2.5rem,6vw,4.25rem) 0 clamp(1.6rem,4vw,2.4rem);
  display:grid;
  grid-template-columns:1.1fr 2fr 1.25fr;
  gap:clamp(1.6rem,4vw,3.2rem);
}
.sd-footer__brand{min-width:0}
.sd-footer__name{
  font-family:var(--sd-font-display);font-weight:900;
  font-size:1.32rem;letter-spacing:.16em;color:var(--sd-bone);margin-bottom:.55rem;
}
.sd-footer__slogan{
  margin-bottom:.9rem;
  font-family:var(--sd-font-display);font-weight:500;
  font-size:.92rem;letter-spacing:.1em;color:var(--sd-gold);
}
.sd-footer__note{margin:0;max-width:32ch;font-size:.78rem;letter-spacing:.05em;color:var(--sd-ash)}
.sd-footer__nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(1.1rem,3vw,2rem)}
.sd-footer__col{min-width:0}
.sd-footer__title{
  font-family:var(--sd-font-body);font-weight:600;
  font-size:.7rem;letter-spacing:.28em;text-transform:uppercase;
  color:var(--sd-gold);margin-bottom:.95rem;
}
.sd-footer__list{list-style:none;margin:0;padding:0;display:grid;gap:.58rem}
.sd-footer__list a{
  position:relative;font-size:.88rem;letter-spacing:.06em;color:rgba(242,237,228,.74);
}
.sd-footer__list a::after{
  content:"";position:absolute;left:0;bottom:-2px;width:100%;height:1px;
  background:var(--sd-violet);transform:scaleX(0);transform-origin:left center;
  transition:transform .24s var(--sd-ease);
}
.sd-footer__list a:hover,.sd-footer__list a:focus-visible{color:var(--sd-gold-bright)}
.sd-footer__list a:hover::after,.sd-footer__list a:focus-visible::after{transform:scaleX(1)}

.sd-footer__contact{min-width:0}
.sd-contact{list-style:none;margin:0 0 1rem;padding:0;display:grid;gap:.85rem}
.sd-contact__row{display:grid;gap:.2rem}
.sd-contact__key{font-size:.64rem;letter-spacing:.26em;color:var(--sd-moss);text-transform:uppercase}
.sd-contact__val{font-size:.86rem;line-height:1.6;color:rgba(242,237,228,.85);word-break:break-word}
.sd-copy{
  justify-self:start;margin-top:.15rem;
  padding:.28rem .72rem;border:1px solid var(--sd-line);border-radius:999px;
  color:var(--sd-gold);font-size:.7rem;font-weight:600;letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .2s var(--sd-ease),color .2s var(--sd-ease);
}
.sd-copy:hover{border-color:var(--sd-gold-bright);color:var(--sd-gold-bright)}
.sd-copy.is-done{border-color:var(--sd-jade);color:var(--sd-jade)}
.sd-footer__base{
  position:relative;z-index:2;
  width:min(var(--sd-shell),100% - 2.5rem);
  margin-inline:auto;
  padding:1.15rem 0 2rem;
  border-top:1px solid var(--sd-line-soft);
  display:flex;flex-wrap:wrap;gap:.5rem 1.6rem;
  justify-content:space-between;align-items:center;
  font-size:.74rem;letter-spacing:.1em;color:var(--sd-ash);
}
.sd-legal{margin:0}
.sd-legal strong{color:var(--sd-gold);font-weight:600;letter-spacing:.08em}

/* ---------- 9. Breadcrumbs ---------- */
.sd-crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;
  list-style:none;margin:0 0 1.6rem;padding:0;
  font-size:.76rem;letter-spacing:.12em;color:var(--sd-ash);
}
.sd-crumbs li{display:flex;align-items:center;gap:.5rem}
.sd-crumbs li + li::before{content:"／";color:var(--sd-moss)}
.sd-crumbs a{color:var(--sd-ash)}
.sd-crumbs a:hover,.sd-crumbs a:focus-visible{color:var(--sd-gold-bright)}
.sd-crumbs [aria-current="page"]{color:var(--sd-bone)}

/* ---------- 10. Panels & cards ---------- */
.sd-panel{
  position:relative;
  padding:clamp(1.4rem,3vw,2.2rem);
  border:1px solid var(--sd-line-soft);border-radius:var(--sd-radius-lg);
  background:linear-gradient(180deg,rgba(22,24,33,.94),rgba(11,11,16,.9));
  box-shadow:var(--sd-shadow);
}
.sd-panel--gold{border-color:var(--sd-line)}
.sd-card{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.6rem);
  border:1px solid var(--sd-line-soft);border-radius:var(--sd-radius);
  background:linear-gradient(180deg,rgba(29,32,41,.72),rgba(11,11,16,.72));
  transition:border-color .24s var(--sd-ease),transform .24s var(--sd-ease);
}
.sd-card:hover{border-color:var(--sd-line);transform:translateY(-3px)}
.sd-card--offset{margin-top:16px}
.sd-card--offset-alt{margin-top:-16px}

/* ---------- 11. Horizontal band ---------- */
.sd-band{
  padding:clamp(1.6rem,4vw,2.4rem) 0;
  border-block:1px solid var(--sd-line);
  background:linear-gradient(90deg,rgba(22,24,33,.92),rgba(11,11,16,.92));
}
.sd-band__track{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:clamp(.9rem,2.4vw,1.5rem);
  align-items:stretch;
}

/* ---------- 12. Steps (台阶递进) ---------- */
.sd-steps{list-style:none;margin:0;padding:0}
.sd-step{
  position:relative;
  padding:1.1rem 0 1.1rem 3.4rem;
  border-top:1px solid var(--sd-line-soft);
}
.sd-step__no{
  position:absolute;left:0;top:1.2rem;
  font-family:var(--sd-font-mono);font-size:.74rem;letter-spacing:.14em;
  color:var(--sd-gold);
}
.sd-step:nth-child(2){margin-left:32px}
.sd-step:nth-child(3){margin-left:64px}
.sd-step:nth-child(4){margin-left:96px}

/* ---------- 13. Info rows & tags ---------- */
.sd-rows{list-style:none;margin:0;padding:0}
.sd-row{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  gap:.8rem 1.2rem;align-items:baseline;
  padding:.85rem 0;
  border-bottom:1px dashed var(--sd-line-soft);
}
.sd-row:first-child{border-top:1px dashed var(--sd-line-soft)}
.sd-tag{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.22rem .62rem;border:1px solid currentColor;border-radius:5px;
  font-size:.68rem;font-weight:600;letter-spacing:.16em;line-height:1.4;
  color:var(--sd-gold);
}
.sd-tag--gold{color:var(--sd-gold)}
.sd-tag--jade{color:var(--sd-jade)}
.sd-tag--lava{color:var(--sd-lava)}
.sd-tag--violet{color:var(--sd-violet)}

/* ---------- 14. Media containers ---------- */
.sd-media{
  position:relative;display:block;width:100%;overflow:hidden;
  border:1px solid var(--sd-line-soft);border-radius:var(--sd-radius);
  background:linear-gradient(180deg,var(--sd-rock),var(--sd-obsidian));
}
.sd-media img,.sd-media__img{width:100%;height:100%;object-fit:cover;display:block}
.sd-media--16x9{aspect-ratio:16/9}
.sd-media--4x3{aspect-ratio:4/3}
.sd-media--1x1{aspect-ratio:1/1}
.sd-media--arch{
  aspect-ratio:3/4;
  border-radius:0;
  clip-path:polygon(50% 0,100% 16%,100% 100%,0 100%,0 16%);
}
.sd-media__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:.7rem .95rem;
  font-size:.72rem;letter-spacing:.14em;color:var(--sd-ash);
  background:linear-gradient(180deg,transparent,rgba(11,11,16,.94));
}
.sd-arch{
  clip-path:polygon(50% 0,100% 18%,100% 100%,0 100%,0 18%);
}
.sd-lightbar{
  position:absolute;top:0;width:12%;height:100%;pointer-events:none;
  background:linear-gradient(180deg,rgba(240,208,122,.18),rgba(240,208,122,0) 78%);
  filter:blur(6px);
  animation:sd-breathe 12s ease-in-out infinite;
}
@keyframes sd-breathe{0%,100%{opacity:.5}50%{opacity:.95}}

/* ---------- 15. Section index (章节目录) ---------- */
.sd-index{list-style:none;margin:0;padding:0}
.sd-index__link{
  display:flex;align-items:baseline;gap:.65rem;
  padding:.42rem .8rem;
  border-left:2px solid transparent;
  font-size:.84rem;letter-spacing:.08em;color:var(--sd-ash);
  transition:color .2s var(--sd-ease),border-color .2s var(--sd-ease);
}
.sd-index__link::before{
  content:attr(data-step);
  font-family:var(--sd-font-mono);font-size:.7rem;letter-spacing:.08em;
  color:var(--sd-moss);
}
.sd-index__link:hover,.sd-index__link:focus-visible{color:var(--sd-bone)}
.sd-index__link[aria-current="true"]{
  color:var(--sd-gold-bright);border-left-color:var(--sd-gold);
}
.sd-index__link[aria-current="true"]::before{color:var(--sd-gold)}

/* ---------- 16. Reveal & back-to-top ---------- */
[data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .34s var(--sd-ease),transform .34s var(--sd-ease);
}
[data-reveal].is-in{opacity:1;transform:none}

.sd-top{
  position:fixed;right:clamp(1rem,3vw,2rem);bottom:clamp(1rem,3vw,2rem);z-index:80;
  width:46px;height:46px;border-radius:50%;
  display:grid;place-items:center;
  border:1px solid var(--sd-line);
  background:rgba(11,11,16,.86);
  color:var(--sd-gold-bright);cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  transition:opacity .26s var(--sd-ease),transform .26s var(--sd-ease),
    visibility .26s var(--sd-ease),border-color .2s var(--sd-ease);
}
.sd-top::before{
  content:"";width:10px;height:10px;
  border-left:1.6px solid currentColor;border-top:1.6px solid currentColor;
  transform:rotate(45deg) translate(1px,1px);
}
.sd-top.is-on{opacity:1;visibility:visible;transform:none}
.sd-top:hover{border-color:var(--sd-gold-bright);box-shadow:0 0 24px rgba(240,208,122,.28)}

/* ---------- 17. Responsive ---------- */
@media (max-width:1040px){
  .sd-header__inner{min-height:var(--sd-header-h-sm)}
  .sd-header.is-stuck .sd-header__inner{min-height:var(--sd-header-h-sm)}
  .sd-burger{display:inline-flex}
  .sd-nav{
    position:fixed;left:0;right:0;top:var(--sd-header-h-sm);
    flex-direction:column;align-items:stretch;gap:0;
    max-height:calc(100vh - var(--sd-header-h-sm));
    overflow-y:auto;
    padding:1.3rem 1.25rem 2.2rem;
    background:linear-gradient(180deg,#0B0B10 0%,#12141B 100%);
    border-bottom:1px solid var(--sd-line);
    box-shadow:0 30px 60px rgba(0,0,0,.6);
    transform:translateY(-14px);opacity:0;visibility:hidden;pointer-events:none;
    transition:transform .28s var(--sd-ease),opacity .28s var(--sd-ease),visibility .28s var(--sd-ease);
  }
  .sd-nav[data-open]{transform:none;opacity:1;visibility:visible;pointer-events:auto}
  .sd-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .sd-nav__link{
    display:block;padding:.92rem .2rem;
    font-size:1rem;letter-spacing:.1em;
    border-bottom:1px solid var(--sd-line-soft);
  }
  .sd-nav__link::after{left:.2rem;right:auto;width:30px;bottom:.6rem}
  .sd-nav__utility{
    flex-direction:column;align-items:stretch;gap:.85rem;
    margin-top:.9rem;padding:1.1rem 0 0;
    border-left:0;border-top:1px solid var(--sd-line);
  }
  .sd-nav__util{padding:.35rem .2rem}
  .sd-nav__utility .sd-btn{width:100%}
}
@media (max-width:900px){
  body{font-size:16px}
  .sd-footer__inner{grid-template-columns:1fr;gap:2rem}
  .sd-footer__nav{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:640px){
  .sd-shell,.sd-narrow,.sd-header__inner,.sd-footer__inner,.sd-footer__base{
    width:min(var(--sd-shell),100% - 2.2rem);
  }
  .sd-footer__nav{grid-template-columns:1fr 1fr}
  .sd-step{padding-left:2.6rem}
  .sd-step:nth-child(2),.sd-step:nth-child(3),.sd-step:nth-child(4){margin-left:0}
  .sd-band{padding:1.4rem 0}
  .sd-band__track{
    display:flex;gap:.9rem;
    overflow-x:auto;scroll-snap-type:x mandatory;
    padding-bottom:.5rem;-webkit-overflow-scrolling:touch;
  }
  .sd-band__track > *{flex:0 0 78%;scroll-snap-align:start}
  .sd-brand__tag{letter-spacing:.22em}
}
@media (max-width:400px){
  .sd-footer__nav{grid-template-columns:1fr}
  .sd-brand__name{font-size:.98rem}
}

/* ---------- 18. 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]{opacity:1;transform:none}
  .sd-lightbar{animation:none;opacity:.65}
  .sd-card:hover{transform:none}
  .sd-btn--gold:hover,.sd-btn--gold:focus-visible{transform:none}
}