/* Berg.force — styles.css */
:root{
  --bg:#0B0B0B;--surface:#141414;--surface2:#1A1A1A;--line:#232323;--line2:#303030;
  --text:#EDEDED;--muted:#8C8C8C;--dim:#5E5E5E;
  --orange:#EE7430;--orange-soft:#D9824B;--peach:#EBC3A3;
  --sans:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Menlo,Consolas,monospace;
  --hdr:68px;--max:1160px;
  box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#0B0B0B}}
:root[data-theme="dark"]{--bg:#0B0B0B}
html{color-scheme:dark;scroll-padding-top:calc(var(--hdr) + 16px)}
*,*::before,*::after{box-sizing:inherit}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased;line-height:1.55}
a{color:inherit;text-decoration:none}
button{font:inherit}
:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:4px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 clamp(16px,4vw,40px)}

/* header */
.brand-block{--lw:min(540px,88vw);display:flex;flex-direction:column;align-items:center;padding:clamp(28px,5vw,48px) 16px clamp(14px,2vw,20px)}
.site-header{position:relative}
.logo-big{display:block;width:var(--lw);height:auto}
.tagline{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:6px 24px;width:calc(min(100% + 32px,var(--max)) - 2*clamp(16px,4vw,40px));margin:calc(var(--lw)*.03) 0 0;font-family:var(--mono);font-weight:500;font-size:max(9px,calc(var(--lw)*.0264));letter-spacing:.36em;text-transform:uppercase;color:var(--muted);line-height:1.4}
.tagline .tl{grid-column:2;display:flex;flex-wrap:wrap;justify-content:center}
.tagline span{white-space:nowrap}
.tagline i{font-style:normal;color:var(--orange);margin:0 .55em}
.tagline .tc{grid-column:3;justify-self:end;margin-right:-.36em;color:var(--orange-soft)}
.tagline b{font-weight:500;font-variant-numeric:tabular-nums}
@media (max-width:1060px){.tagline{display:flex;flex-direction:column;align-items:center}.tagline .tc{margin-right:0}}
.navbar{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:rgba(11,11,11,.9);backdrop-filter:saturate(140%) blur(10px);-webkit-backdrop-filter:saturate(140%) blur(10px);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.bar{max-width:var(--max);margin:0 auto;height:var(--hdr);padding:0 clamp(16px,4vw,40px);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:20px}
.left{justify-self:start;display:flex;align-items:center}
.right{justify-self:end;display:flex;align-items:center;gap:12px}
.mini{opacity:0;transform:translateY(4px);pointer-events:none;transition:opacity .25s,transform .25s}
.mini.show{opacity:1;transform:none;pointer-events:auto}
.logo-small{height:22px;width:auto;display:block}
.nav{display:flex;gap:clamp(22px,3vw,40px)}
.nav a{font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);position:relative;padding:6px 0;white-space:nowrap;transition:color .2s}
.nav a:hover,.nav a.active{color:var(--text)}
.nav a.active::after{content:"";position:absolute;left:50%;bottom:-8px;width:5px;height:5px;margin-left:-2.5px;border-radius:50%;background:var(--orange)}
.lang{display:inline-flex;border:1px solid var(--line2);border-radius:999px;padding:3px;background:var(--surface)}
.lang button{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--muted);background:none;border:0;padding:6px 11px;border-radius:999px;cursor:pointer}
.lang button[aria-pressed="true"]{background:var(--orange);color:#0B0B0B}
.yt{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:500;border:1px solid var(--line2);border-radius:999px;padding:8px 14px;white-space:nowrap;transition:border-color .2s}
.yt:hover{border-color:var(--orange-soft)}
.yt svg{width:16px;height:16px}
.soc{display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 14px 0 11px;font-size:13px;font-weight:500;white-space:nowrap;border:1px solid var(--line2);border-radius:999px;transition:border-color .2s}
.soc:hover{border-color:var(--orange-soft)}
.soc svg{width:20px;height:20px;flex-shrink:0}
.drawer .row{display:flex;gap:10px;flex-wrap:wrap}
.menu-btn{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line2);background:var(--surface);color:var(--text);cursor:pointer;align-items:center;justify-content:center}
.menu-btn span,.menu-btn span::before,.menu-btn span::after{display:block;width:18px;height:2px;background:currentColor;border-radius:2px;position:relative;transition:transform .25s,background .25s}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0}
.menu-btn span::before{top:-6px}.menu-btn span::after{top:6px}
.menu-btn[aria-expanded="true"] span{background:transparent}
.menu-btn[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}
.drawer{display:none;border-top:1px solid var(--line);padding:4px clamp(16px,4vw,40px) 20px}
.drawer.open{display:block}
.drawer a.dl{display:flex;justify-content:space-between;align-items:center;padding:15px 0;border-bottom:1px solid var(--line);font-size:18px;font-weight:500}
.drawer a.dl.active::after{content:"";width:7px;height:7px;border-radius:50%;background:var(--orange)}
.drawer .row{padding-top:16px}
@media (max-width:1000px){.mini{display:none}.right .soc span{display:none}.right .soc{padding:0;width:38px;justify-content:center}}
@media (max-width:860px){.nav,.right .yt,.right .soc.hide-sm{display:none}.menu-btn{display:inline-flex}.bar{grid-template-columns:1fr auto}.mini{display:block}}
.pwr-ring{transform-box:fill-box;transform-origin:center;animation:powerOn 1.1s cubic-bezier(.2,.8,.2,1) .25s both}
@keyframes powerOn{0%{fill:#2A2A2A;transform:scale(.86)}55%{fill:#EE7430;transform:scale(1.06)}100%{fill:#EE7430;transform:scale(1)}}

/* home */
main{min-height:60vh}
.hero{padding:clamp(48px,8vw,96px) 0 clamp(36px,5vw,56px);display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:clamp(24px,5vw,64px);align-items:end}
.hero h1{font-size:clamp(28px,4.2vw,46px);line-height:1.05;letter-spacing:-.035em;margin:0;font-weight:700;max-width:16ch}
.hero p{color:var(--muted);margin:0 0 20px;font-size:17px;max-width:44ch}
.btns{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;border-radius:10px;padding:11px 18px;font-size:14px;font-weight:500;border:1px solid var(--line2);transition:border-color .2s,background .2s}
.btn:hover{border-color:var(--orange-soft)}
.btn.primary{background:var(--orange);border-color:var(--orange);color:#0B0B0B;font-weight:700}
.btn.primary:hover{background:#F2833F}
@media (max-width:760px){.hero{grid-template-columns:1fr;align-items:start}}

.sec-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin:0 0 18px}
.sec-head h2{font-size:22px;letter-spacing:-.02em;margin:0}
.sec-head a{font-size:13px;color:var(--muted)}
.sec-head a:hover{color:var(--text)}
.folders{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px;margin-bottom:clamp(40px,6vw,64px)}
.folder{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 18px 16px;display:flex;flex-direction:column;gap:22px;min-height:132px;transition:border-color .2s,transform .2s}
.folder:hover{border-color:var(--orange-soft)}
.folder svg{width:26px;height:26px}
.folder b{font-size:16px;font-weight:700;letter-spacing:-.01em;display:block}
.folder small{font-family:var(--mono);font-size:11px;color:var(--muted)}

/* list */
.items{display:grid;gap:10px;margin-bottom:56px}
.item{display:grid;grid-template-columns:52px minmax(0,1fr) auto;gap:16px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 16px;transition:border-color .2s}
.item:hover{border-color:var(--line2)}
.ico{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--surface2);border:1px solid var(--line)}
.ico svg{width:22px;height:22px}
.item h3{font-size:16px;margin:0 0 3px;letter-spacing:-.01em}
.item p{margin:0;color:var(--muted);font-size:14px}
.meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.tag{font-family:var(--mono);font-size:11px;color:var(--peach);background:#1d1612;border:1px solid #3a2a20;border-radius:6px;padding:2px 7px}
.tag.plain{color:var(--muted);background:transparent;border-color:var(--line2)}
.go{font-size:13px;font-weight:500;border:1px solid var(--line2);border-radius:999px;padding:8px 14px;white-space:nowrap}
.item:hover .go{border-color:var(--orange-soft)}
@media (max-width:620px){.item{grid-template-columns:44px minmax(0,1fr)}.ico{width:44px;height:44px}.go{grid-column:2;justify-self:start}}

/* folder view */
.crumbs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--muted);padding-top:32px}
.crumbs a:hover{color:var(--text)}
.crumbs .sep{color:var(--dim)}
.page-title{font-size:clamp(28px,4vw,42px);letter-spacing:-.03em;margin:10px 0 6px;line-height:1.1}
.page-desc{color:var(--text);opacity:.85;max-width:720px;margin:0 0 8px;font-size:16px}
.page-sub{color:var(--muted);margin:0 0 28px}
.layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:clamp(20px,4vw,48px);align-items:start;padding-bottom:40px}
.tree{position:sticky;top:calc(var(--hdr) + 20px);border:1px solid var(--line);border-radius:14px;padding:10px;background:var(--surface)}
.tree a{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;font-size:14px;color:var(--muted)}
.tree a:hover{color:var(--text);background:var(--surface2)}
.tree a.on{color:var(--text);background:var(--surface2)}
.tree a.on::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--orange);flex-shrink:0}
.tree .d1{padding-left:24px}.tree .d2{padding-left:38px}
.tree .root{font-weight:500;color:var(--text)}
@media (max-width:860px){.layout{grid-template-columns:1fr}.tree{position:static}}
.empty{border:1px dashed var(--line2);border-radius:14px;padding:32px 20px;text-align:center;color:var(--muted)}
.empty b{display:block;color:var(--text);font-size:16px;margin-bottom:4px}

/* about */
.about{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:clamp(24px,5vw,56px);padding:8px 0 64px}
.about p{color:#BDBDBD;font-size:17px;max-width:58ch}
.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:24px 0}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px}
.stat b{display:block;font-size:30px;letter-spacing:-.03em;color:var(--orange)}
.stat span{font-size:13px;color:var(--muted);line-height:1.35;display:block}
.certs{display:grid;gap:10px}
.cert{display:flex;gap:12px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:15px;font-weight:500}
.cert svg{width:22px;height:22px;flex-shrink:0}
.cert small{display:block;color:var(--muted);font-weight:400;font-size:12px}
@media (max-width:760px){.about{grid-template-columns:1fr}.stats{grid-template-columns:1fr 1fr 1fr}}

footer{border-top:1px solid var(--line);margin-top:32px}
.foot{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center;padding-top:28px;padding-bottom:36px;color:var(--dim);font-size:12px}
.foot .logo-small{height:18px}
.foot p{margin:4px 0 0;max-width:60ch}
.foot nav{display:flex;gap:16px}
.foot nav a{color:var(--muted)}
.foot nav a:hover{color:var(--text)}
@media (prefers-reduced-motion:reduce){.pwr-ring{animation:none}*{transition:none!important}}
.item.soon{cursor:default}
.item.soon .go{color:var(--muted);border-style:dashed}