/* =====================================================================
   Andrei Vogulkin — personal site
   Design system: "Dark technical, restrained"  ·  monochrome grayscale
   ===================================================================== */

:root{
  --font-display:'Space Grotesk', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono:'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  /* grayscale scale (neutral, slightly cool-neutral) */
  --bg:#191a1b;
  --bg-2:#1d1e1f;
  --surface:#202122;
  --surface-2:#26282a;
  --surface-3:#2c2e30;
  --border:#313335;
  --border-soft:#272a2c;

  --text:#ededec;
  --text-2:#b7b8b8;
  --text-3:#8b8c8d;
  --text-faint:#6a6b6c;

  --white:#f4f4f3;

  --maxw:920px;
  --side:286px;
  --pad:64px;
  --radius:12px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font-display);font-size:16px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
::selection{background:#3a3d3f;color:#fff;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}

/* ---------- App shell ---------- */
#bg-wave{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none;}
.app{display:grid;grid-template-columns:var(--side) 1fr;min-height:100vh;position:relative;z-index:1;}

.sidebar{
  position:sticky;top:0;align-self:start;height:100vh;
  background:var(--bg-2);border-right:1px solid var(--border-soft);
  padding:38px 30px;display:flex;flex-direction:column;gap:34px;
}
.s-brand .name{font-size:1.45rem;font-weight:600;letter-spacing:-.01em;line-height:1.05;}
.s-brand .role{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--text-3);margin-top:9px;
}
.s-nav{display:flex;flex-direction:column;gap:2px;margin-top:4px;}
.s-nav a{
  display:flex;align-items:center;gap:12px;padding:9px 0;
  font-size:.95rem;color:var(--text-2);border-bottom:1px solid var(--border-soft);
  transition:color .18s var(--ease);
}
.s-nav a .idx{font-family:var(--font-mono);font-size:.68rem;color:var(--text-faint);width:20px;}
.s-nav a:hover{color:var(--text);}
.s-nav a.active{color:var(--white);}
.s-nav a.active .idx{color:var(--text-2);}

.s-foot{margin-top:auto;display:flex;flex-direction:column;gap:14px;}
.s-meta{font-family:var(--font-mono);font-size:.72rem;line-height:1.8;color:var(--text-3);}
.s-meta a:hover{color:var(--text);text-decoration:underline;text-underline-offset:3px;}
.s-social{display:flex;gap:16px;font-family:var(--font-mono);font-size:.72rem;color:var(--text-3);}
.s-social a:hover{color:var(--text);}

/* ---------- Main ---------- */
.main{min-width:0;}
.wrap{max-width:var(--maxw);padding:0 var(--pad);}
.section{padding:104px 0;border-top:1px solid var(--border-soft);}
.section:first-of-type{border-top:none;}
.hero{padding-top:120px;}
.contact-sec{padding-bottom:120px;}

/* ---------- Type ---------- */
.eyebrow{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--text-3);display:flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--text-faint);display:inline-block;}
.eyebrow.bare::before{display:none;}

h1,h2,h3{font-weight:500;letter-spacing:-.02em;margin:0;line-height:1.06;}
.h-hero{font-size:clamp(2.5rem,5.2vw,4rem);font-weight:500;letter-spacing:-.03em;line-height:1.03;}
.h-sec{font-size:clamp(1.7rem,2.6vw,2.2rem);letter-spacing:-.02em;}
.lead{font-size:1.12rem;line-height:1.7;color:var(--text-2);max-width:60ch;}
.muted{color:var(--text-3);}
.serif-none{}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);
  font-size:.95rem;font-weight:500;padding:13px 22px;border-radius:9px;cursor:pointer;
  border:1px solid var(--border);background:transparent;color:var(--text);
  transition:background .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn .arrow{font-family:var(--font-mono);transition:transform .2s var(--ease);}
.btn:hover{border-color:var(--text-3);}
.btn:hover .arrow{transform:translateX(3px);}
.btn-primary{background:var(--white);color:#171819;border-color:var(--white);}
.btn-primary:hover{background:#fff;border-color:#fff;transform:translateY(-1px);}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;}

/* ---------- Mono link ---------- */
.mlink{
  font-family:var(--font-mono);font-size:.82rem;color:var(--text-2);
  display:inline-flex;align-items:center;gap:8px;transition:color .18s var(--ease);
}
.mlink .arrow{transition:transform .2s var(--ease);}
.mlink:hover{color:var(--white);}
.mlink:hover .arrow{transform:translateX(3px);}

/* ---------- Services lifecycle ---------- */
.svc-phase{margin-top:48px;}
.svc-phase:first-child{margin-top:34px;}
.phase-label{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-3);display:flex;align-items:center;gap:14px;margin-bottom:22px;
}
.phase-label .n{color:var(--text);}
.phase-label::after{content:"";flex:1;height:1px;background:var(--border-soft);}
.svc-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--border-soft);
  border:1px solid var(--border-soft);border-radius:12px;overflow:hidden;}
.svc-item{
  background:var(--bg);padding:22px 24px;display:flex;gap:14px;align-items:flex-start;
  transition:background .18s var(--ease);
}
.svc-item:hover{background:var(--surface);}
.svc-item .ar{font-family:var(--font-mono);color:var(--text-3);font-size:.95rem;line-height:1.5;}
.svc-item h3{font-size:1.02rem;font-weight:500;letter-spacing:-.01em;}
.svc-item p{margin:6px 0 0;font-family:var(--font-mono);font-size:.76rem;letter-spacing:.02em;color:var(--text-3);line-height:1.5;}

/* ---------- Work / case study cards ---------- */
.work-grid{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.card{display:flex;flex-direction:column;gap:16px;}
.card .cover{aspect-ratio:16/10;border-radius:12px;}
.card .meta{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--text-faint);display:flex;gap:14px;}
.card h3{font-size:1.22rem;font-weight:500;letter-spacing:-.015em;line-height:1.2;transition:color .18s var(--ease);}
.card:hover h3{color:var(--white);}
.card p{margin:0;color:var(--text-3);font-size:.95rem;}
.tags{display:flex;gap:8px;flex-wrap:wrap;}
.tag{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.04em;color:var(--text-3);
  border:1px solid var(--border);border-radius:999px;padding:4px 11px;}

/* ---------- Writing list ---------- */
.post-list{display:flex;flex-direction:column;border-top:1px solid var(--border-soft);}
.post-row{
  display:grid;grid-template-columns:120px 1fr auto;gap:26px;align-items:baseline;
  padding:26px 8px;border-bottom:1px solid var(--border-soft);
  transition:padding-left .2s var(--ease),background .2s var(--ease);
}
.post-row:hover{padding-left:18px;background:linear-gradient(90deg,var(--surface),transparent 70%);}
.post-row .date{font-family:var(--font-mono);font-size:.74rem;color:var(--text-faint);letter-spacing:.04em;}
.post-row h3{font-size:1.18rem;font-weight:500;letter-spacing:-.015em;line-height:1.25;}
.post-row .sub{margin:7px 0 0;color:var(--text-3);font-size:.92rem;}
.post-row .go{font-family:var(--font-mono);font-size:.9rem;color:var(--text-faint);transition:transform .2s var(--ease),color .2s var(--ease);}
.post-row:hover .go{color:var(--text);transform:translateX(3px);}

/* ---------- Clients ---------- */
.clients{display:flex;gap:14px;flex-wrap:wrap;align-items:center;}
.client-mark{
  width:148px;height:62px;border:1px solid var(--border);border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.06em;color:var(--text-2);
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.client-mark:hover{border-color:var(--text-3);color:var(--text);}

/* ---------- Image / logo placeholder ---------- */
.ph{
  position:relative;border:1px solid var(--border);border-radius:12px;overflow:hidden;
  background:
    repeating-linear-gradient(135deg,transparent 0 9px,rgba(255,255,255,.022) 9px 10px),
    var(--surface);
  display:flex;align-items:center;justify-content:center;text-align:center;
}
.ph::after{
  content:attr(data-label);font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;
  color:var(--text-faint);padding:10px;
}

/* ---------- Stat row ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border-soft);
  border:1px solid var(--border-soft);border-radius:12px;overflow:hidden;}
.stat{background:var(--bg);padding:26px 22px;}
.stat .n{font-size:1.9rem;font-weight:500;letter-spacing:-.02em;}
.stat .l{font-family:var(--font-mono);font-size:.72rem;color:var(--text-3);margin-top:8px;letter-spacing:.03em;}

/* ---------- Contact ---------- */
.contact-card{
  border:1px solid var(--border);border-radius:16px;padding:48px;background:var(--bg-2);
  display:flex;flex-direction:column;gap:24px;
}
.email-big{font-size:clamp(1.4rem,3vw,2.1rem);font-weight:500;letter-spacing:-.02em;}
.email-big:hover{text-decoration:underline;text-underline-offset:6px;}
.email-line{display:flex;align-items:center;gap:18px;flex-wrap:wrap;}
.copy-btn{
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.04em;color:var(--text-2);
  background:transparent;border:1px solid var(--border);border-radius:8px;padding:8px 13px;
  transition:border-color .16s var(--ease),color .16s var(--ease),background .16s var(--ease);
}
.copy-btn:hover{border-color:var(--text-3);color:var(--text);}
.copy-btn .copy-ic{font-size:.95rem;line-height:1;}
.copy-btn.copied{border-color:var(--text-2);color:var(--white);}
.email-copy{display:inline-flex;align-items:center;gap:9px;}
.copy-mini{display:inline-flex;align-items:center;justify-content:center;cursor:pointer;
  font-family:var(--font-mono);font-size:.82rem;line-height:1;color:var(--text-3);
  background:transparent;border:1px solid var(--border);border-radius:6px;padding:4px 7px;
  transition:border-color .16s var(--ease),color .16s var(--ease);}
.copy-mini:hover{border-color:var(--text-3);color:var(--text);}
.copy-mini.copied{border-color:var(--text-2);color:var(--white);}

/* ---------- Prose (post template) ---------- */
.prose{max-width:66ch;}
.prose p{color:var(--text-2);margin:0 0 24px;line-height:1.78;}
.prose h2{font-size:1.5rem;margin:48px 0 18px;letter-spacing:-.02em;}
.prose h3{font-size:1.15rem;margin:36px 0 12px;}
.prose ul{color:var(--text-2);padding-left:20px;margin:0 0 24px;line-height:1.8;}
.prose li{margin-bottom:8px;}
.prose blockquote{margin:32px 0;padding:6px 0 6px 24px;border-left:2px solid var(--border);
  color:var(--text-3);font-size:1.1rem;}
.prose code{font-family:var(--font-mono);font-size:.85em;background:var(--surface-2);
  padding:2px 7px;border-radius:5px;color:var(--text);}
.prose pre{background:var(--bg-2);border:1px solid var(--border);border-radius:10px;padding:20px;
  overflow:auto;font-family:var(--font-mono);font-size:.82rem;line-height:1.7;color:var(--text-2);margin:0 0 24px;}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease);}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;}}

/* ---------- Mobile top bar ---------- */
.topbar{display:none;}
.mobile-menu{display:none;}

@media (max-width:900px){
  .app{grid-template-columns:1fr;}
  .sidebar{display:none;}
  .topbar{
    display:flex;align-items:center;justify-content:space-between;gap:16px;
    position:sticky;top:0;z-index:40;padding:16px 22px;
    background:rgba(25,26,27,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--border-soft);
  }
  .topbar .name{font-size:1.05rem;font-weight:600;}
  .topbar .menu-btn{font-family:var(--font-mono);font-size:.8rem;color:var(--text-2);
    border:1px solid var(--border);border-radius:8px;padding:8px 12px;background:transparent;cursor:pointer;}
  .mobile-menu{display:none;flex-direction:column;position:sticky;top:57px;z-index:39;
    background:var(--bg-2);border-bottom:1px solid var(--border-soft);padding:8px 22px 18px;}
  .mobile-menu.open{display:flex;}
  .mobile-menu a{padding:11px 0;color:var(--text-2);border-bottom:1px solid var(--border-soft);font-size:.98rem;}
  .wrap{padding:0 24px;}
  :root{--pad:24px;}
  .section{padding:64px 0;}
  .hero{padding-top:40px;}
  .contact-sec{padding-bottom:72px;}
  .svc-grid,.work-grid,.stats{grid-template-columns:1fr;}
  .stats{grid-template-columns:1fr 1fr;}
  .post-row{grid-template-columns:90px 1fr;gap:14px;}
  .post-row .go{display:none;}
  .contact-card{padding:30px;}
}