/* ============================================================
   币启 (CoinStart) — Dark Dashboard + Neon Theme
   ============================================================ */

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#08080f;--bg2:#12121a;--bg3:#1a1a28;--bg4:#222235;
  --neon:#00ff88;--neon2:#00d4ff;--neon3:#a78bfa;
  --neon-glow:0 0 12px rgba(0,255,136,.3);
  --neon2-glow:0 0 12px rgba(0,212,255,.3);
  --text:#e2e8f0;--text2:#94a3b8;--text3:#64748b;
  --border:#1e1e2e;--border2:#2a2a3d;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Consolas,monospace;
  --sans:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --container:1080px;
}
html{scroll-behavior:smooth;scroll-padding-top:64px}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--neon);text-decoration:none;transition:color .15s}
a:hover{color:var(--neon2)}
img{max-width:100%}
.container{max-width:var(--container);margin:0 auto;padding:0 20px}

/* ===== Neon Utilities ===== */
.glow{text-shadow:0 0 8px rgba(0,255,136,.4)}
.glow2{text-shadow:0 0 8px rgba(0,212,255,.4)}
.panel{background:var(--bg2);border:1px solid var(--border);border-radius:8px}
.panel:hover{border-color:var(--border2)}
.neon-line{height:1px;background:linear-gradient(90deg,transparent,var(--neon),transparent)}
.neon2-line{height:1px;background:linear-gradient(90deg,transparent,var(--neon2),transparent)}

/* ===== Header — terminal bar ===== */
.hdr{position:sticky;top:0;z-index:100;background:rgba(8,8,15,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.hdr__inner{display:flex;align-items:center;height:56px;gap:24px}
.hdr__brand{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-weight:700;font-size:.95rem;color:var(--neon)}
.hdr__brand-dot{width:8px;height:8px;border-radius:50%;background:var(--neon);box-shadow:var(--neon-glow);animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hdr__nav{display:flex;gap:20px;margin-left:auto}
.hdr__nav a{font-size:.85rem;color:var(--text2);font-weight:500;transition:color .15s}
.hdr__nav a:hover{color:var(--neon)}
.hdr__cta{font-family:var(--mono);font-size:.78rem;padding:6px 14px;border:1px solid var(--neon);color:var(--neon);border-radius:4px;transition:all .2s;white-space:nowrap}
.hdr__cta:hover{background:var(--neon);color:var(--bg);box-shadow:var(--neon-glow)}
.lang-switch{display:flex;gap:4px}
.lang-switch a{font-family:var(--mono);font-size:.7rem;padding:2px 6px;border-radius:3px;color:var(--text3);font-weight:600;border:1px solid transparent;transition:all .15s}
.lang-switch a:hover{color:var(--neon2);border-color:var(--neon2)}
.lang-switch a.active{background:rgba(0,212,255,.15);color:var(--neon2);border-color:rgba(0,212,255,.3)}
.hdr__burger{display:none;background:none;border:none;color:var(--text);cursor:pointer}
.hdr__burger svg{width:22px;height:22px}

/* Mobile overlay */
.mob{position:fixed;inset:0;z-index:200;background:rgba(8,8,15,.97);backdrop-filter:blur(20px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;opacity:0;visibility:hidden;transition:all .25s}
.mob--open{opacity:1;visibility:visible}
.mob a{font-size:1.1rem;color:var(--text2);font-weight:500}
.mob a:hover{color:var(--neon)}
.mob__close{position:absolute;top:16px;right:16px;background:none;border:none;color:var(--text2);cursor:pointer}
.mob__close svg{width:24px;height:24px}
.mob__lang{display:flex;gap:10px;margin-top:12px}
.mob__lang a{font-family:var(--mono);font-size:.9rem;padding:6px 14px;border-radius:20px;border:1px solid var(--border2);color:var(--text3)}
.mob__lang a.on{background:rgba(0,212,255,.15);border-color:var(--neon2);color:var(--neon2)}

@media(max-width:768px){
  .hdr__nav,.hdr__cta,.lang-switch{display:none}
  .hdr__burger{display:block}
}

/* ===== Hero — Terminal Welcome ===== */
.hero{padding:60px 0 40px;border-bottom:1px solid var(--border)}
.hero__split{display:flex;align-items:center;gap:48px}
.hero__left{flex:1}
.hero__title{font-size:2.2rem;font-weight:800;line-height:1.2;margin-bottom:16px}
.hero__desc{color:var(--text2);font-size:.95rem;line-height:1.7;margin-bottom:28px;max-width:480px}
.hero__btns{display:flex;gap:12px}
.hero__btn{display:inline-flex;align-items:center;gap:6px;padding:12px 24px;border-radius:6px;font-size:.9rem;font-weight:600;transition:all .2s}
.hero__btn--primary{background:var(--neon);color:var(--bg);box-shadow:var(--neon-glow)}
.hero__btn--primary:hover{color:var(--bg);box-shadow:0 0 24px rgba(0,255,136,.5);transform:translateY(-1px)}
.hero__btn--outline{border:1px solid var(--border2);color:var(--text2)}
.hero__btn--outline:hover{border-color:var(--neon2);color:var(--neon2)}
.hero__right{width:360px;flex-shrink:0}
.hero__ticker{background:var(--bg2);border:1px solid var(--border);border-radius:10px;overflow:hidden}
.hero__ticker-header{display:flex;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border);font-family:var(--mono);font-size:.72rem;color:var(--text3);text-transform:uppercase;letter-spacing:1px}
.hero__ticker-row{display:flex;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border);transition:background .15s}
.hero__ticker-row:last-child{border-bottom:none}
.hero__ticker-row:hover{background:var(--bg3)}
.hero__ticker-coin{font-family:var(--mono);font-size:.85rem;font-weight:600;width:90px;display:flex;align-items:center;gap:8px}
.hero__ticker-icon{color:var(--neon2);font-size:1rem}
.hero__ticker-price{flex:1;text-align:right;font-family:var(--mono);font-size:.85rem;color:var(--text)}
.hero__ticker-change{width:80px;text-align:right;font-family:var(--mono);font-size:.8rem;color:var(--text3)}
.hero__ticker-change--up{color:#00ff88}
.hero__ticker-change--down{color:#ff5f57}
@media(max-width:768px){
  .hero__split{flex-direction:column;gap:32px}
  .hero__right{width:100%}
  .hero__title{font-size:1.6rem}
}

/* ===== Stats Dashboard ===== */
.dash{padding:40px 0}
.dash__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.dash__card{background:var(--bg2);border:1px solid var(--border);border-radius:8px;padding:20px;text-align:center;transition:border-color .2s}
.dash__card:hover{border-color:var(--neon)}
.dash__val{font-family:var(--mono);font-size:1.8rem;font-weight:700;color:var(--neon);text-shadow:0 0 20px rgba(0,255,136,.3)}
.dash__val--alt{color:var(--neon2);text-shadow:0 0 20px rgba(0,212,255,.3)}
.dash__label{font-size:.8rem;color:var(--text3);margin-top:4px}
@media(max-width:640px){.dash__grid{grid-template-columns:repeat(2,1fr)}}

/* ===== Categories — Neon Chips ===== */
.cats{padding:32px 0}
.cats__title{font-family:var(--mono);font-size:.8rem;color:var(--text3);text-transform:uppercase;letter-spacing:2px;margin-bottom:16px}
.cats__grid{display:flex;flex-wrap:wrap;gap:10px}
.cats__chip{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;background:var(--bg2);border:1px solid var(--border);border-radius:6px;font-size:.85rem;color:var(--text2);transition:all .2s}
.cats__chip:hover{border-color:var(--neon);color:var(--neon);box-shadow:var(--neon-glow)}
.cats__chip-count{font-family:var(--mono);font-size:.72rem;color:var(--text3);background:var(--bg3);padding:1px 6px;border-radius:3px}

/* ===== Article Table (homepage) ===== */
.feed{padding:40px 0}
.feed__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.feed__title{font-family:var(--mono);font-size:.8rem;color:var(--text3);text-transform:uppercase;letter-spacing:2px}
.feed__more{font-family:var(--mono);font-size:.78rem;color:var(--neon);border:1px solid var(--border);padding:4px 12px;border-radius:4px;transition:all .15s}
.feed__more:hover{border-color:var(--neon);box-shadow:var(--neon-glow)}
.feed__table{width:100%;border-collapse:collapse}
.feed__table tr{border-bottom:1px solid var(--border);transition:background .15s}
.feed__table tr:hover{background:var(--bg2)}
.feed__table td{padding:14px 12px;vertical-align:top}
.feed__table td:first-child{width:1%;white-space:nowrap}
.feed__idx{font-family:var(--mono);font-size:.75rem;color:var(--text3)}
.feed__link{font-size:.92rem;color:var(--text);font-weight:500;transition:color .15s}
.feed__link:hover{color:var(--neon)}
.feed__meta{font-family:var(--mono);font-size:.72rem;color:var(--text3);margin-top:3px}
.feed__tag{color:var(--neon2);margin-left:8px}
.feed__date{white-space:nowrap;font-family:var(--mono);font-size:.75rem;color:var(--text3);text-align:right;width:1%}
@media(max-width:640px){.feed__date{display:none}}

/* ===== Portal — Category Blocks ===== */
.portal{padding:40px 0}
.portal__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.portal__block{background:var(--bg2);border:1px solid var(--border);border-radius:8px;overflow:hidden;transition:border-color .2s}
.portal__block:hover{border-color:var(--neon)}
.portal__block-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border)}
.portal__block-title{font-family:var(--mono);font-size:.85rem;font-weight:600;color:var(--neon)}
.portal__block-more{font-family:var(--mono);font-size:.72rem;color:var(--text3);transition:color .15s}
.portal__block-more:hover{color:var(--neon2)}
.portal__block-list{display:flex;flex-direction:column}
.portal__item{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--border);transition:background .15s;color:var(--text)}
.portal__item:last-child{border-bottom:none}
.portal__item:hover{background:var(--bg3)}
.portal__item-title{font-size:.85rem;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;margin-right:12px}
.portal__item:hover .portal__item-title{color:var(--neon)}
.portal__item-date{font-family:var(--mono);font-size:.72rem;color:var(--text3);white-space:nowrap}
@media(max-width:768px){.portal__grid{grid-template-columns:1fr}}

/* ===== Steps — Command Line ===== */
.steps{padding:40px 0}
.steps__title{font-family:var(--mono);font-size:.8rem;color:var(--text3);text-transform:uppercase;letter-spacing:2px;margin-bottom:16px}
.steps__list{display:flex;flex-direction:column;gap:12px}
.step{display:flex;gap:16px;padding:16px;background:var(--bg2);border:1px solid var(--border);border-radius:8px;transition:border-color .2s}
.step:hover{border-color:var(--neon)}
.step__num{font-family:var(--mono);font-size:1.4rem;font-weight:700;color:var(--neon);min-width:32px;text-shadow:var(--neon-glow)}
.step__title{font-weight:600;margin-bottom:4px}
.step__desc{font-size:.88rem;color:var(--text2)}
.step__link{font-family:var(--mono);font-size:.8rem;color:var(--neon);border:1px solid var(--border);padding:3px 10px;border-radius:4px;margin-left:6px;white-space:nowrap;transition:all .15s;display:inline-block;margin-top:6px}
.step__link:hover{border-color:var(--neon);box-shadow:var(--neon-glow);background:rgba(0,255,136,.08)}

/* ===== FAQ — Accordion ===== */
.faq{padding:40px 0}
.faq__title{font-family:var(--mono);font-size:.8rem;color:var(--text3);text-transform:uppercase;letter-spacing:2px;margin-bottom:16px}
.faq__item{border-bottom:1px solid var(--border)}
.faq__q{width:100%;display:flex;align-items:center;justify-content:space-between;padding:16px 0;background:none;border:none;color:var(--text);font-size:.92rem;font-weight:500;cursor:pointer;text-align:left;font-family:inherit;transition:color .15s}
.faq__q:hover{color:var(--neon)}
.faq__q svg{width:16px;height:16px;color:var(--text3);transition:transform .2s;flex-shrink:0}
.faq__item--open .faq__q svg{transform:rotate(180deg)}
.faq__a{display:none;padding:0 0 16px;font-size:.88rem;color:var(--text2);line-height:1.7}
.faq__item--open .faq__a{display:block}

/* ===== CTA — Neon Banner ===== */
.cta-bar{padding:40px 0}
.cta-bar__inner{background:var(--bg2);border:1px solid var(--neon);border-radius:10px;padding:32px;text-align:center;box-shadow:0 0 40px rgba(0,255,136,.08)}
.cta-bar__title{font-size:1.3rem;font-weight:700;margin-bottom:8px}
.cta-bar__desc{color:var(--text2);font-size:.9rem;margin-bottom:20px}
.cta-bar__btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ===== Footer — single line ===== */
.ftr{border-top:1px solid var(--border);padding:20px 0;margin-top:40px}
.ftr__line{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px}
.ftr__copy{font-size:.75rem;color:var(--text3)}
.ftr__nav{display:flex;gap:16px}
.ftr__nav a{font-size:.78rem;color:var(--text3);transition:color .15s}
.ftr__nav a:hover{color:var(--neon)}
@media(max-width:640px){
  .ftr__line{flex-direction:column;text-align:center}
}

/* ===== Breadcrumb ===== */
.bread{padding:16px 0;font-family:var(--mono);font-size:.78rem}
.bread a{color:var(--text3)}
.bread a:hover{color:var(--neon)}
.bread__sep{color:var(--text3);margin:0 6px}
.bread span:last-child{color:var(--text2)}

/* ===== Posts List Page ===== */
.posts-page{padding:40px 0}
.posts-page__title{font-family:var(--mono);font-size:1.4rem;font-weight:700;margin-bottom:4px}
.posts-page__desc{font-size:.88rem;color:var(--text3);margin-bottom:24px}
.posts-page__filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
.posts-page__filter{font-family:var(--mono);font-size:.78rem;padding:5px 12px;border:1px solid var(--border);border-radius:4px;color:var(--text3);background:none;cursor:pointer;transition:all .15s}
.posts-page__filter:hover{border-color:var(--neon);color:var(--neon)}
.posts-page__filter--on{border-color:var(--neon);color:var(--neon);background:rgba(0,255,136,.08)}
.posts-page__filter--off{opacity:.4;cursor:default}

/* ===== Tags Page ===== */
.tags-page{padding:40px 0}
.tags-page__title{font-family:var(--mono);font-size:1.4rem;font-weight:700;margin-bottom:24px}
.tags-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.tag-card{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:var(--bg2);border:1px solid var(--border);border-radius:8px;color:var(--text);transition:all .2s}
.tag-card:hover{border-color:var(--neon);color:var(--neon)}
.tag-card--empty{opacity:.35;cursor:default}
.tag-card__left{display:flex;align-items:center;gap:8px}
.tag-card__icon{font-size:1.1rem}
.tag-card__name{font-size:.9rem;font-weight:500}
.tag-card__count{font-family:var(--mono);font-size:.75rem;color:var(--text3)}

/* ===== Tag Detail Page ===== */
.tag-detail{padding:40px 0}
.tag-detail__header{display:flex;align-items:center;gap:12px;margin-bottom:24px}
.tag-detail__icon{font-size:1.6rem}
.tag-detail__title{font-size:1.4rem;font-weight:700}
.tag-detail__count{font-family:var(--mono);font-size:.82rem;color:var(--text3)}

/* ===== Post Card (list item) ===== */
.post-row{display:block;padding:16px 0;border-bottom:1px solid var(--border);transition:background .15s}
.post-row:hover{background:var(--bg2);padding-left:12px;padding-right:12px;margin:0 -12px;border-radius:6px}
.post-row__title{font-size:.95rem;font-weight:500;color:var(--text);margin-bottom:3px;transition:color .15s}
.post-row:hover .post-row__title{color:var(--neon)}
.post-row__meta{font-family:var(--mono);font-size:.72rem;color:var(--text3)}
.post-row__tag{color:var(--neon2);margin-left:6px}
.post-row__desc{font-size:.84rem;color:var(--text2);margin-top:4px}

/* ===== Article Page ===== */
.article{padding:40px 0}
.article__layout{display:grid;grid-template-columns:200px 1fr;gap:40px;align-items:start}
.article__header{margin-bottom:32px}
.article__title{font-size:1.8rem;font-weight:700;line-height:1.3;margin-bottom:12px}
.article__meta{font-family:var(--mono);font-size:.78rem;color:var(--text3);display:flex;gap:16px;flex-wrap:wrap;margin-bottom:12px}
.article__meta a{color:var(--neon2)}
.article__body{line-height:1.85;font-size:1rem;color:var(--text)}
.article__body h2{font-size:1.3rem;font-weight:700;margin:32px 0 12px;padding-bottom:8px;border-bottom:1px solid var(--border);color:var(--neon)}
.article__body h3{font-size:1.1rem;font-weight:600;margin:24px 0 8px;color:var(--neon2)}
.article__body p{margin-bottom:16px}
.article__body a{color:var(--neon);text-decoration:underline;text-underline-offset:3px}
.article__body a:hover{color:var(--neon2)}
.article__body ul,.article__body ol{margin:0 0 16px 20px}
.article__body li{margin-bottom:6px}
.article__body code{font-family:var(--mono);font-size:.88em;background:var(--bg3);color:var(--neon);padding:2px 6px;border-radius:3px}
.article__body pre{background:var(--bg2);border:1px solid var(--border);border-radius:8px;padding:16px;overflow-x:auto;margin:16px 0}
.article__body pre code{background:none;padding:0;color:var(--text)}
.article__body blockquote{border-left:3px solid var(--neon);padding:12px 16px;margin:16px 0;background:var(--bg2);border-radius:0 8px 8px 0;color:var(--text2)}
.article__body img{border-radius:8px;border:1px solid var(--border)}
.article__body table{width:100%;border-collapse:collapse;margin:16px 0}
.article__body th,.article__body td{padding:10px 12px;border:1px solid var(--border);font-size:.88rem}
.article__body th{background:var(--bg3);font-weight:600;text-align:left}

/* TOC sidebar */
.toc{position:sticky;top:72px;font-size:.82rem}
.toc__title{font-family:var(--mono);font-size:.72rem;color:var(--text3);text-transform:uppercase;letter-spacing:1.5px;margin-bottom:12px}
.toc__list{list-style:none;border-left:1px solid var(--border)}
.toc__list li{padding:6px 0 6px 14px;border-left:2px solid transparent;margin-left:-1px}
.toc__list a{color:var(--text3);transition:color .15s}
.toc__list a:hover{color:var(--neon)}
.toc__list li.active{border-left-color:var(--neon)}
.toc__list li.active a{color:var(--neon)}

@media(max-width:860px){
  .article__layout{grid-template-columns:1fr}
  .toc{position:static;margin-bottom:24px;padding:16px;background:var(--bg2);border:1px solid var(--border);border-radius:8px}
}

/* ===== Share Row ===== */
.share{display:flex;align-items:center;gap:10px;margin:32px 0;font-family:var(--mono);font-size:.78rem;color:var(--text3)}
.share__btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:6px;border:1px solid var(--border);color:var(--text3);transition:all .15s}
.share__btn:hover{border-color:var(--neon);color:var(--neon)}
.share__btn svg{width:16px;height:16px}
.share__copy{cursor:pointer;padding:6px 12px;border-radius:4px;border:1px solid var(--border);background:none;color:var(--text3);font-family:var(--mono);font-size:.78rem;transition:all .15s}
.share__copy:hover{border-color:var(--neon2);color:var(--neon2)}
.share__copy--done{border-color:var(--neon);color:var(--neon)}

/* ===== Download CTA ===== */
.dl-cta{background:var(--bg2);border:1px solid var(--border2);border-radius:10px;padding:24px;margin:32px 0;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.dl-cta__text h3{font-size:1rem;margin-bottom:4px}
.dl-cta__text p{font-size:.85rem;color:var(--text2)}
.dl-cta__btns{display:flex;gap:10px}

/* ===== Related Posts ===== */
.related{margin:32px 0}
.related__title{font-family:var(--mono);font-size:.8rem;color:var(--text3);text-transform:uppercase;letter-spacing:2px;margin-bottom:12px}
.related__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.related__item{padding:14px;background:var(--bg2);border:1px solid var(--border);border-radius:8px;transition:border-color .2s}
.related__item:hover{border-color:var(--neon)}
.related__item a{font-size:.88rem;color:var(--text);font-weight:500}
.related__item a:hover{color:var(--neon)}
.related__item time{font-family:var(--mono);font-size:.72rem;color:var(--text3);display:block;margin-top:6px}
@media(max-width:640px){.related__grid{grid-template-columns:1fr}}

/* ===== CTA include (posts/tags bottom) ===== */
.cta{background:var(--bg2);border:1px solid var(--border);border-radius:10px;padding:24px;text-align:center;margin-top:32px}
.cta__title{font-size:1.1rem;font-weight:700;margin-bottom:6px}
.cta__desc{font-size:.88rem;color:var(--text2);margin-bottom:16px}
.cta__btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

/* ===== Buttons ===== */
.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:6px;font-size:.88rem;font-weight:600;transition:all .2s;cursor:pointer;border:none}
.btn--neon{background:var(--neon);color:var(--bg);box-shadow:var(--neon-glow)}
.btn--neon:hover{color:var(--bg);box-shadow:0 0 24px rgba(0,255,136,.5);transform:translateY(-1px)}
.btn--outline{border:1px solid var(--border2);color:var(--text2);background:none}
.btn--outline:hover{border-color:var(--neon2);color:var(--neon2)}
.btn--sm{padding:7px 14px;font-size:.82rem}

/* ===== 404 ===== */
.err{text-align:center;padding:80px 20px}
.err__code{font-family:var(--mono);font-size:6rem;font-weight:800;color:var(--neon);text-shadow:0 0 40px rgba(0,255,136,.2);line-height:1}
.err__title{font-size:1.3rem;font-weight:700;margin:16px 0 8px}
.err__desc{color:var(--text2);margin-bottom:28px}
.err__btns{display:flex;gap:12px;justify-content:center}

/* ===== About / Page ===== */
.page{padding:40px 0}
.page__title{font-size:1.6rem;font-weight:700;margin-bottom:24px}
.page__body{line-height:1.85;color:var(--text2);max-width:720px}
.page__body h2{font-size:1.2rem;font-weight:700;color:var(--text);margin:28px 0 12px}
.page__body p{margin-bottom:14px}
.page__body a{color:var(--neon)}
.page__body ul{margin:0 0 14px 20px}
.page__body li{margin-bottom:6px}

/* ===== Back to top ===== */
.back-top{position:fixed;bottom:24px;right:24px;width:40px;height:40px;border-radius:6px;border:1px solid var(--border);background:var(--bg2);color:var(--text3);cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transform:translateY(8px);transition:all .25s;z-index:100}
.back-top svg{width:18px;height:18px}
.back-top:hover{border-color:var(--neon);color:var(--neon);box-shadow:var(--neon-glow)}
.back-top--show{opacity:1;visibility:visible;transform:translateY(0)}
@media(max-width:768px){.back-top{bottom:16px;right:16px;width:36px;height:36px}}

/* ===== Scrollbar ===== */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--bg4);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text3)}