:root{
  --bg:#0a0d24; --bg2:#12173a; --panel:#171d44; --panel2:#1e2554;
  --ink:#e9edff; --muted:#9aa3cf; --line:#2c3570;
  --gold:#ffd447; --red:#ff4d6d; --green:#3ddc84; --cyan:#55d6ff; --purple:#8f7bff;
  --font-pixel:'Press Start 2P',monospace;
  --font-display:'VT323',monospace;
  --font-body:'Be Vietnam Pro',-apple-system,'Segoe UI',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;font-synthesis:none}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);font-family:var(--font-body);
  line-height:1.7;overflow-x:hidden;min-height:100vh;
}
img{max-width:100%;image-rendering:pixelated}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--gold)}
::selection{background:var(--purple);color:#fff}

/* ── Chống copy: cấm bôi đen toàn trang (trừ ô nhập liệu), cấm kéo ảnh ── */
body{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}
input,textarea{-webkit-user-select:text;-moz-user-select:text;user-select:text}
img,svg{-webkit-user-drag:none;user-drag:none}

/* ── Scrollbar theo theme (mặc định của browser sáng chói, phá tông tối) ── */
*{scrollbar-width:thin;scrollbar-color:#2a3160 #0a0d24}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:#0a0d24}
::-webkit-scrollbar-thumb{background:#2a3160;border:2px solid #0a0d24}
::-webkit-scrollbar-thumb:hover{background:#4a3f8f}
::-webkit-scrollbar-corner{background:#0a0d24}

/* ── CRT scanlines + vignette ─────────────────────────── */
body::after{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:9999;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,.14) 0 1px,transparent 1px 3px);
  opacity:.5;mix-blend-mode:multiply;
}

/* ── Pixel border helper (viền góc vuông kiểu 8-bit) ──── */
.px{
  position:relative;border:none;
  box-shadow:0 -4px 0 0 var(--pxc,var(--line)),0 4px 0 0 var(--pxc,var(--line)),
             -4px 0 0 0 var(--pxc,var(--line)),4px 0 0 0 var(--pxc,var(--line));
}

/* ── Tiếng Việt: Press Start 2P không có dấu tiếng Việt (fallback font
   hệ thống + bold giả rất xấu) → các heading/nút chuyển sang VT323
   (có vietnamese subset), cỡ chữ chỉnh lại vì VT323 hẹp hơn nhiều. */
html[lang="vi"] .px-btn{font-family:var(--font-display);font-size:22px;letter-spacing:2px;font-weight:400;padding:12px 26px}
html[lang="vi"] .section-title{font-family:var(--font-display);font-size:clamp(28px,4.2vw,40px);font-weight:400}
html[lang="vi"] .page-title{font-family:var(--font-display);font-size:clamp(30px,4.6vw,42px);font-weight:400}
html[lang="vi"] .wiki-hero h1{font-family:var(--font-display);font-size:clamp(34px,5.2vw,50px);font-weight:400}
html[lang="vi"] .wiki-card .more{font-family:var(--font-display);font-size:17px;letter-spacing:1px}
html[lang="vi"] .stat-box .val{font-family:var(--font-display);font-size:30px;font-weight:400}
html[lang="vi"] .hero-title{letter-spacing:1px}

/* ── Header ───────────────────────────────────────────── */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(10,13,36,.88);backdrop-filter:blur(8px);
  border-bottom:2px solid var(--line);
  transition:box-shadow .3s,background .3s;
}
.site-header.scrolled{
  background:rgba(7,9,26,.96);
  box-shadow:0 4px 0 rgba(0,0,0,.35),0 12px 30px rgba(0,0,0,.45);
}
.site-header .inner{
  max-width:1120px;margin:0 auto;padding:0 20px;height:64px;
  display:flex;align-items:center;gap:24px;
}
.logo{
  font-family:var(--font-pixel);font-size:14px;color:var(--gold);
  text-shadow:2px 2px 0 #7a3b00;letter-spacing:1px;white-space:nowrap;
}
.logo .dot{color:var(--red);animation:blink 1.2s steps(2) infinite}
.main-nav{display:flex;gap:4px;margin-left:auto;align-items:center}
.main-nav a{
  font-family:var(--font-display);font-size:20px;letter-spacing:1px;
  color:var(--muted);padding:6px 14px;text-transform:uppercase;
}
.main-nav a:hover,.main-nav a.active{color:var(--gold)}
.main-nav a.active{border-bottom:3px solid var(--gold)}
.lang-switch{display:flex;gap:6px;margin-left:12px}
.lang-switch a{
  font-family:var(--font-pixel);font-size:9px;padding:7px 9px;color:var(--muted);
  background:var(--panel);--pxc:var(--line);
  box-shadow:0 -3px 0 0 var(--pxc),0 3px 0 0 var(--pxc),-3px 0 0 0 var(--pxc),3px 0 0 0 var(--pxc);
}
.lang-switch a.active{color:#081020;background:var(--gold);--pxc:#a97f00}
.nav-toggle{display:none;margin-left:auto;background:none;border:none;color:var(--gold);font-size:26px;cursor:pointer;font-family:var(--font-display)}
@media(max-width:760px){
  .nav-toggle{display:block}
  .main-nav{
    display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;
    background:rgba(10,13,36,.97);padding:12px 0 18px;border-bottom:2px solid var(--line);
  }
  .main-nav.open{display:flex}
  .lang-switch{margin:10px 0 0}
}

/* ── Hero ─────────────────────────────────────────────── */
.hero{
  position:relative;min-height:100svh;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;
  padding:110px 20px 150px;overflow:hidden;
  background:linear-gradient(180deg,#05071a 0%,#0a0d24 34%,#131a45 68%,#233069 100%);
}
#stars{position:absolute;inset:0;pointer-events:none}
.star{position:absolute;background:#fff;animation:twinkle 3s steps(3) infinite}
@keyframes twinkle{0%,100%{opacity:.9}50%{opacity:.15}}
@keyframes blink{50%{opacity:0}}

.cloud{position:absolute;pointer-events:none;opacity:.85;animation:drift linear infinite}
@keyframes drift{from{transform:translateX(-30vw)}to{transform:translateX(115vw)}}

.hero-title{
  font-family:var(--font-pixel);color:var(--gold);
  font-size:clamp(26px,6.2vw,58px);letter-spacing:2px;line-height:1.25;
  text-shadow:0 4px 0 #8a4a00,0 8px 0 rgba(0,0,0,.55),-3px -3px 0 rgba(143,123,255,.35);
  animation:bob 2.6s ease-in-out infinite;position:relative;z-index:3;
}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.hero-tagline{
  font-family:var(--font-display);font-size:clamp(22px,3.4vw,34px);
  color:var(--cyan);margin-top:22px;letter-spacing:1px;position:relative;z-index:3;
}
.hero-sub{max-width:620px;margin:14px auto 0;color:var(--muted);font-size:17px;position:relative;z-index:3}
.hero-cta{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;margin-top:38px;position:relative;z-index:3}
.play-note{margin-top:16px;font-family:var(--font-display);font-size:19px;color:var(--muted);position:relative;z-index:3}

.px-btn{
  display:inline-block;font-family:var(--font-pixel);font-size:13px;cursor:pointer;
  padding:16px 26px;color:#081020;background:var(--gold);--pxc:#a97f00;
  box-shadow:0 -4px 0 0 var(--pxc),0 4px 0 0 var(--pxc),-4px 0 0 0 var(--pxc),4px 0 0 0 var(--pxc),0 10px 0 -2px rgba(0,0,0,.45);
  transition:transform .06s;
}
.px-btn:hover{filter:brightness(1.1);color:#081020}
.px-btn:active{transform:translateY(4px)}
.px-btn.alt{background:var(--panel2);color:var(--cyan);--pxc:#0e1230}
.px-btn.alt:hover{color:var(--gold)}
.px-btn .arrow{animation:blink 1s steps(2) infinite}

.sprite{position:absolute;z-index:2;animation:floaty 3.4s steps(7) infinite;filter:drop-shadow(0 6px 0 rgba(0,0,0,.35))}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-16px)}}

.hills{position:absolute;left:0;right:0;bottom:0;z-index:2;display:block;width:100%}

/* ── Sections ─────────────────────────────────────────── */
.section{max-width:1120px;margin:0 auto;padding:84px 20px}
.section-title{
  font-family:var(--font-pixel);font-size:clamp(16px,2.6vw,24px);color:var(--gold);
  text-align:center;text-shadow:2px 2px 0 rgba(0,0,0,.6);margin-bottom:12px;
}
.section-title::before,.section-title::after{content:' ◆ ';color:var(--red);font-size:.8em}
.section-sub{text-align:center;color:var(--muted);max-width:640px;margin:0 auto 46px}

.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:26px}
.feature{
  background:var(--panel);padding:26px 22px;--pxc:var(--line);
  transition:transform .16s;
}
.feature:hover{transform:translateY(-6px);--pxc:var(--purple)}
.feature .icon{font-size:34px;display:block;margin-bottom:12px;filter:drop-shadow(2px 2px 0 rgba(0,0,0,.5))}
.feature h3{font-family:var(--font-display);font-size:24px;color:var(--cyan);letter-spacing:1px;margin-bottom:6px}
.feature p{color:var(--muted);font-size:15px}

/* ── Upcoming (tính năng sắp ra mắt) — phong cách "bản thiết kế" ── */
.version-row{text-align:center;margin:-30px 0 40px}
.version-badge{
  display:inline-block;font-family:var(--font-pixel);font-size:12px;color:var(--green);
  background:rgba(61,220,132,.08);padding:10px 18px;letter-spacing:1px;
  box-shadow:0 -3px 0 0 #1d7a4c,0 3px 0 0 #1d7a4c,-3px 0 0 0 #1d7a4c,3px 0 0 0 #1d7a4c;
  animation:badge-glow 2.4s ease-in-out infinite;
}
.version-badge .dot{color:var(--gold);animation:blink 1.2s steps(2) infinite}
@keyframes badge-glow{0%,100%{filter:drop-shadow(0 0 0 rgba(61,220,132,0))}50%{filter:drop-shadow(0 0 10px rgba(61,220,132,.45))}}
.upcoming-card{
  background:rgba(143,123,255,.05);
  box-shadow:none;border:3px dashed #4a3f8f;
}
.upcoming-card:hover{transform:translateY(-6px);border-color:var(--purple)}
.upcoming-card .soon-tag{
  position:absolute;top:10px;right:10px;font-family:var(--font-pixel);font-size:8px;
  color:var(--purple);border:2px solid #4a3f8f;padding:4px 6px;letter-spacing:1px;
  animation:blink 2s steps(2) infinite;
}
.upcoming-card .icon{filter:grayscale(.2) drop-shadow(2px 2px 0 rgba(0,0,0,.5))}
.upcoming-card h3{color:var(--purple)}
.upcoming-note{text-align:center;color:#5a628f;font-size:13.5px;margin-top:34px;font-style:italic}

.stats-strip{display:flex;flex-wrap:wrap;justify-content:center;gap:26px;margin-top:60px}
.stat-box{background:var(--panel2);--pxc:var(--line);padding:18px 30px;text-align:center;min-width:150px}
.stat-box .val{font-family:var(--font-pixel);font-size:18px;color:var(--green)}
.stat-box .lbl{font-family:var(--font-display);font-size:18px;color:var(--muted);margin-top:6px}

.about-panel{background:var(--panel);--pxc:var(--line);padding:38px;max-width:820px;margin:0 auto}
.about-panel .prose{color:var(--ink)}

/* ── Hiệu ứng tương tác ──────────────────────────────────
   Thanh tiến trình cuộn, shine sweep trên nút, icon nảy khi hover,
   gạch chân nav chạy, pixel burst khi click, emoji đi dạo. */
#scroll-progress{
  position:fixed;top:0;left:0;height:4px;width:0%;z-index:300;pointer-events:none;
  background:linear-gradient(90deg,var(--gold),var(--red) 55%,var(--purple));
  box-shadow:0 0 10px rgba(255,212,71,.45);
}
.px-btn{position:relative;overflow:hidden}
.px-btn::before{
  content:'';position:absolute;top:0;left:-80%;width:45%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.4),transparent);
  transform:skewX(-20deg);pointer-events:none;
}
.px-btn:hover::before{animation:shine .55s ease-out}
@keyframes shine{to{left:135%}}
.feature:hover .icon,.stat-box:hover .val{animation:icon-pop .4s}
.wiki-card:hover .thumb{animation:icon-pop .4s}
@keyframes icon-pop{0%{transform:scale(1)}40%{transform:scale(1.22) rotate(-6deg)}75%{transform:scale(.96) rotate(3deg)}100%{transform:scale(1)}}
.main-nav a{position:relative}
.main-nav a:not(.active)::after{
  content:'';position:absolute;left:14px;right:100%;bottom:1px;height:3px;
  background:var(--gold);transition:right .22s steps(6);
}
.main-nav a:not(.active):hover::after{right:14px}
.px-burst{position:fixed;pointer-events:none;z-index:9998}
.walker{
  position:absolute;bottom:116px;left:-10%;z-index:2;pointer-events:none;
  animation:walk-x linear infinite,walk-hop .55s steps(2) infinite;
  filter:drop-shadow(2px 3px 0 rgba(0,0,0,.4));
}
.walker.flip{scale:-1 1}
@keyframes walk-x{from{left:-10%}to{left:110%}}
@keyframes walk-hop{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}

/* ── Responsive nhỏ ─────────────────────────────────────── */
@media(max-width:520px){
  .section{padding:56px 16px}
  .hero{padding:96px 16px 130px}
  .hero-cta{gap:14px}
  .px-btn{padding:14px 18px;font-size:11px}
  html[lang="vi"] .px-btn{font-size:19px;padding:10px 18px}
  .hero .sprite:nth-of-type(3),.hero .sprite:nth-of-type(4){display:none}
  .walker{font-size:20px!important}
  .version-row{margin:-16px 0 30px}
  .about-panel{padding:24px 18px}
  .stats-strip{gap:14px}
  .stat-box{min-width:126px;padding:14px 18px}
}

/* ── Scroll reveal ────────────────────────────────────────
   .reveal ẩn sẵn; JS thêm .in (stagger delay) khi cuộn tới, rồi GỠ class
   .reveal sau khi chạy xong để transition hover riêng của phần tử
   (.feature, .wiki-card...) hoạt động lại bình thường. */
.reveal{opacity:0;transform:translateY(30px) scale(.98);transition:opacity .6s cubic-bezier(.2,.7,.3,1),transform .6s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .sprite,.cloud,.hero-title,.star{animation:none!important}
}

/* ── Footer ───────────────────────────────────────────── */
.site-footer{border-top:2px solid var(--line);background:#070a1c;margin-top:40px}
.site-footer .inner{max-width:1120px;margin:0 auto;padding:40px 20px;text-align:center}
.footer-nav{display:flex;justify-content:center;gap:26px;flex-wrap:wrap;margin-bottom:16px}
.footer-nav a{font-family:var(--font-display);font-size:19px;color:var(--muted);text-transform:uppercase;letter-spacing:1px}
.footer-nav a:hover{color:var(--gold)}
.site-footer .copy{font-family:var(--font-display);font-size:18px;color:#5a628f}
.site-footer .note{color:#454c78;font-size:13px;margin-top:6px}

/* ── Page (privacy/terms) & prose ─────────────────────── */
.page-wrap{max-width:860px;margin:0 auto;padding:120px 20px 80px}
.page-panel{background:var(--panel);--pxc:var(--line);padding:44px 42px}
@media(max-width:600px){.page-panel{padding:28px 18px}}
.page-title{
  font-family:var(--font-pixel);font-size:clamp(15px,3vw,22px);color:var(--gold);
  line-height:1.5;margin-bottom:8px;text-shadow:2px 2px 0 rgba(0,0,0,.6);
}
.page-meta{font-family:var(--font-display);font-size:18px;color:var(--muted);margin-bottom:30px}

.prose{font-size:16.5px}
.prose h1,.prose h2{
  font-family:var(--font-display);letter-spacing:1px;color:var(--gold);
  font-size:28px;margin:34px 0 12px;padding-bottom:6px;border-bottom:2px dashed var(--line);
}
.prose h3{font-family:var(--font-display);font-size:23px;color:var(--cyan);margin:26px 0 8px}
.prose p{margin:12px 0;color:var(--ink)}
.prose ul,.prose ol{margin:12px 0 12px 26px}
.prose li{margin:6px 0}
.prose strong{color:var(--gold)}
.prose em{color:var(--cyan)}
.prose blockquote{border-left:4px solid var(--purple);padding:8px 18px;margin:16px 0;background:rgba(143,123,255,.08)}
.prose code{background:#0b0f2c;color:var(--green);padding:2px 7px;font-family:var(--font-display);font-size:.95em}
.prose pre{background:#0b0f2c;padding:16px;overflow-x:auto;margin:16px 0;border:2px solid var(--line)}
.prose hr{border:none;border-top:2px dashed var(--line);margin:28px 0}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:15px;display:block;overflow-x:auto}
.prose th,.prose td{border:2px solid var(--line);padding:9px 12px;text-align:left}
.prose th{background:var(--panel2);font-family:var(--font-display);font-size:18px;color:var(--cyan);letter-spacing:.5px}
.prose tr:nth-child(even) td{background:rgba(255,255,255,.025)}
.prose img{display:block;margin:18px auto;border:4px solid var(--line)}

/* ── Plunlab (wiki) ───────────────────────────────────── */
.wiki-hero{
  padding:130px 20px 56px;text-align:center;
  background:linear-gradient(180deg,#05071a,#0e1333 80%,var(--bg));
  border-bottom:2px solid var(--line);position:relative;overflow:hidden;
}
.wiki-hero h1{
  font-family:var(--font-pixel);font-size:clamp(20px,4vw,34px);color:var(--green);
  text-shadow:0 4px 0 #0c5c36,0 8px 0 rgba(0,0,0,.5);
}
.wiki-hero p{color:var(--muted);margin-top:14px;font-size:17px}
.wiki-search{margin:26px auto 0;max-width:460px;position:relative;z-index:2}
.wiki-search input{
  width:100%;padding:14px 18px;background:var(--panel);border:none;color:var(--ink);
  font-family:var(--font-display);font-size:21px;letter-spacing:.5px;outline:none;
  box-shadow:0 -4px 0 0 var(--line),0 4px 0 0 var(--line),-4px 0 0 0 var(--line),4px 0 0 0 var(--line);
}
.wiki-search input:focus{box-shadow:0 -4px 0 0 var(--green),0 4px 0 0 var(--green),-4px 0 0 0 var(--green),4px 0 0 0 var(--green)}

/* ── Thanh chuyên mục sticky (nhảy nhanh giữa các mục) ── */
.cat-nav{
  position:sticky;top:64px;z-index:60;background:rgba(10,13,36,.92);
  backdrop-filter:blur(8px);border-bottom:2px solid var(--line);
}
.cat-nav .inner{
  max-width:1120px;margin:0 auto;padding:10px 20px;display:flex;gap:8px;
  overflow-x:auto;scrollbar-width:none;
}
.cat-nav .inner::-webkit-scrollbar{display:none}
.cat-chip{
  flex-shrink:0;font-family:var(--font-display);font-size:17px;letter-spacing:.5px;
  color:var(--muted);background:var(--panel);padding:5px 12px;
  border:2px solid var(--line);border-left:5px solid var(--cat,var(--line));
  transition:transform .12s;
}
.cat-chip b{color:var(--cat,var(--gold));font-weight:400;margin-left:4px}
.cat-chip:hover{color:var(--ink);transform:translateY(-2px);border-color:var(--cat,var(--gold))}

.wiki-body{max-width:1120px;margin:0 auto;padding:46px 20px 80px}
.wiki-cat{margin-bottom:52px;scroll-margin-top:130px}
.wiki-cat>h2{
  font-family:var(--font-display);font-size:27px;color:var(--cat,var(--gold));letter-spacing:1px;
  margin-bottom:20px;display:flex;align-items:center;gap:12px;
}
.wiki-cat>h2::before{content:'';width:10px;height:10px;background:var(--cat,var(--gold));box-shadow:3px 3px 0 rgba(0,0,0,.4)}
.wiki-cat>h2::after{content:'';flex:1;height:2px;background:repeating-linear-gradient(90deg,var(--line) 0 8px,transparent 8px 16px)}
.cat-count{font-size:14px;color:#5a628f;font-family:var(--font-body);letter-spacing:0}
.wiki-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(255px,1fr));gap:22px}
.wiki-card{
  display:flex;flex-direction:column;background:var(--panel);--pxc:var(--line);
  border-top:4px solid var(--cat,var(--line));
  transition:transform .12s;color:var(--ink);overflow:hidden;
}
.wiki-card:hover{transform:translateY(-5px);--pxc:var(--cat,var(--green));color:var(--ink)}
.wiki-card .thumb{
  height:110px;display:flex;align-items:center;justify-content:center;font-size:42px;
  background:
    linear-gradient(color-mix(in srgb,var(--cat,#20285c) 10%,rgba(10,13,36,.3)),rgba(10,13,36,.35)),
    repeating-conic-gradient(var(--panel2) 0 25%,#20285c 0 50%) 0 0/28px 28px;
  border-bottom:2px solid var(--line);
}
.wiki-card .thumb img{width:100%;height:110px;object-fit:cover;display:block}
.wiki-card .body{padding:16px 18px 18px;display:flex;flex-direction:column;gap:6px;flex:1}
.wiki-card h3{font-family:var(--font-display);font-size:23px;color:var(--cyan);letter-spacing:.5px}
.wiki-card:hover h3{color:var(--cat,var(--gold))}
.wiki-card p{color:var(--muted);font-size:14px;flex:1}
.wiki-card .more{font-family:var(--font-pixel);font-size:9px;color:var(--green);margin-top:8px}
#wiki-empty{
  text-align:center;color:var(--muted);font-family:var(--font-display);font-size:24px;
  padding:60px 0;letter-spacing:1px;
}

/* Article — 3 cột: mục lục trái · nội dung · TOC phải */
.article-layout{max-width:1240px;margin:0 auto;padding:110px 20px 80px;display:grid;grid-template-columns:250px minmax(0,1fr);gap:38px}
.article-layout.has-toc{grid-template-columns:240px minmax(0,1fr) 210px}
@media(max-width:1080px){.article-layout.has-toc{grid-template-columns:250px minmax(0,1fr)}.toc-col{display:none}}
@media(max-width:880px){.article-layout,.article-layout.has-toc{grid-template-columns:1fr}}
/* Sidebar: scrollbar siêu mảnh, trong suốt khi không hover, và chừa
   khoảng đệm để không dính sát viền pixel của các box. */
.wiki-side{
  position:sticky;top:90px;align-self:start;max-height:calc(100vh - 110px);
  overflow:auto;padding:6px 14px 6px 6px;
  scrollbar-width:thin;scrollbar-color:transparent transparent;
}
.wiki-side:hover{scrollbar-color:#2a3160 transparent}
.wiki-side::-webkit-scrollbar{width:5px}
.wiki-side::-webkit-scrollbar-track{background:transparent}
.wiki-side::-webkit-scrollbar-thumb{background:transparent;border:none}
.wiki-side:hover::-webkit-scrollbar-thumb{background:#2a3160}
.wiki-side::-webkit-scrollbar-thumb:hover{background:#4a3f8f}
@media(max-width:880px){.wiki-side{position:static;max-height:none;order:2}}
.wiki-side .box{background:var(--panel);--pxc:var(--line);padding:18px;margin-bottom:24px;border-left:4px solid var(--cat,var(--line))}
.wiki-side h4{font-family:var(--font-display);font-size:20px;color:var(--cat,var(--gold));letter-spacing:1px;margin-bottom:10px;text-transform:uppercase}
.wiki-side a{display:block;font-size:14px;color:var(--muted);padding:4px 0}
.wiki-side a:hover{color:var(--cyan)}
.wiki-side a.here{color:var(--green)}
.wiki-side a.here::before{content:'▶ ';font-size:10px}
.article-main{min-width:0}
.crumb{font-family:var(--font-display);font-size:18px;color:var(--muted);margin-bottom:14px}
.crumb a{color:var(--green)}
.crumb-cat{color:var(--cat,var(--muted))}
.article-main .page-title{color:var(--green);text-shadow:0 3px 0 #0c5c36,2px 2px 0 rgba(0,0,0,.5)}
.article-hero-img{width:100%;max-height:300px;object-fit:cover;border:4px solid var(--line);margin-bottom:24px}
.prose h2,.prose h3{scroll-margin-top:90px}

/* ── Mục lục (TOC) ── */
.toc-col{min-width:0}
.toc{
  position:sticky;top:90px;background:var(--panel);--pxc:var(--line);
  padding:16px;max-height:calc(100vh - 120px);overflow:auto;
  scrollbar-width:thin;scrollbar-color:transparent transparent;
}
.toc:hover{scrollbar-color:#2a3160 transparent}
.toc::-webkit-scrollbar{width:5px}
.toc::-webkit-scrollbar-track{background:transparent}
.toc::-webkit-scrollbar-thumb{background:transparent}
.toc:hover::-webkit-scrollbar-thumb{background:#2a3160}
.toc h4{font-family:var(--font-display);font-size:18px;color:var(--gold);letter-spacing:1px;margin-bottom:8px;text-transform:uppercase}
.toc a{display:block;font-size:13px;color:var(--muted);padding:4px 0;border-left:3px solid transparent;padding-left:8px;line-height:1.45}
.toc a.lv3{padding-left:20px;font-size:12.5px}
.toc a:hover{color:var(--cyan)}
.toc a.active{color:var(--cat,var(--green));border-left-color:var(--cat,var(--green))}
.toc-mobile{display:none;background:var(--panel);--pxc:var(--line);padding:12px 16px;margin-bottom:22px}
.toc-mobile summary{
  cursor:pointer;font-family:var(--font-display);font-size:19px;color:var(--gold);
  letter-spacing:1px;list-style:none;
}
.toc-mobile summary::-webkit-details-marker{display:none}
.toc-mobile a{display:block;font-size:14px;color:var(--muted);padding:5px 0 5px 8px}
.toc-mobile a.lv3{padding-left:22px}
.toc-mobile a:hover{color:var(--cyan)}
@media(max-width:1080px){.toc-mobile{display:block}}

/* ── Bài trước / Bài tiếp ── */
.article-pager{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:44px}
@media(max-width:600px){.article-pager{grid-template-columns:1fr}}
.pager-card{
  display:flex;flex-direction:column;gap:4px;background:var(--panel);--pxc:var(--line);
  padding:14px 18px;color:var(--muted);transition:transform .12s;
}
.pager-card:hover{transform:translateY(-3px);--pxc:var(--cat,var(--green));color:var(--muted)}
.pager-card span{font-family:var(--font-pixel);font-size:9px;color:var(--cat,var(--green))}
.pager-card b{font-family:var(--font-display);font-size:20px;color:var(--ink);font-weight:400;letter-spacing:.5px}
.pager-card:hover b{color:var(--cat,var(--gold))}
.pager-card.next{text-align:right;align-items:flex-end}

/* 404 */
.nf-wrap{min-height:70vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:120px 20px 60px}
.nf-wrap .code{font-family:var(--font-pixel);font-size:56px;color:var(--red);text-shadow:0 5px 0 #6b0f22}
.nf-wrap p{color:var(--muted);margin:18px 0 26px;font-family:var(--font-display);font-size:22px}