/* =============================================================
   kniazkov.dev — editorial light theme
   Design system + components. Mobile-first. No heavy animation.
   Fonts self-hosted (no external requests, GDPR-friendly).
   ============================================================= */

/* ---------- Fonts: Fraunces (display), self-hosted ---------- */
@font-face{font-family:'Fraunces';font-style:normal;font-weight:400 600;font-display:swap;
  src:url('/assets/fonts/fraunces-latin.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:'Fraunces';font-style:normal;font-weight:400 600;font-display:swap;
  src:url('/assets/fonts/fraunces-latin-ext.woff2') format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}
@font-face{font-family:'Fraunces';font-style:italic;font-weight:400 600;font-display:swap;
  src:url('/assets/fonts/fraunces-italic-latin.woff2') format('woff2');
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;}
@font-face{font-family:'Fraunces';font-style:italic;font-weight:400 600;font-display:swap;
  src:url('/assets/fonts/fraunces-italic-latin-ext.woff2') format('woff2');
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;}

/* ---------- Tokens ---------- */
:root {
  --bg:        #fbfbf9;
  --surface:   #ffffff;
  --ink:       #161514;
  --ink-2:     #545049;
  --ink-3:     #6e6960;
  --line:      #e7e3db;
  --line-2:    #d8d3c9;
  --accent:    #2438f0;
  --accent-ink:#1a2bc0;
  --accent-wash:#eef0fe;
  --maxw: 1120px;
  --pad: clamp(1.15rem, 5vw, 2.5rem);
  --radius: 6px;
  --radius-lg: 14px;
  --shadow: 0 1px 2px rgba(20,18,16,.04), 0 8px 30px rgba(20,18,16,.06);
  --shadow-sm: 0 1px 2px rgba(20,18,16,.05);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-serif: "Fraunces", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", "Consolas", monospace;
  --t: 220ms cubic-bezier(.4,0,.2,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){ html { scroll-behavior: auto; } }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 1.0625rem;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-optical-sizing: auto;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
ul { list-style: none; padding: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }
.section { padding-block: clamp(3.5rem, 9vw, 7rem); }
.section--tight { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.divider { border: 0; border-top: 1px solid var(--line); }

/* ---------- Type ---------- */
.kicker {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent-ink);
  display: inline-flex;
  align-items: center;
  gap: .55rem;
}
.kicker::before {
  content: "";
  width: 1.6rem; height: 1px;
  background: var(--accent);
  display: inline-block;
}
.kicker--plain::before { display: none; }

h1,h2,h3,h4 { font-family: var(--font-serif); font-weight: 500; line-height: 1.08; letter-spacing: -.01em; }
.display {
  font-size: clamp(2.6rem, 7.5vw, 5rem);
  line-height: 1.02;
  letter-spacing: -.02em;
  font-weight: 480;
}
.h2 { font-size: clamp(1.8rem, 4.2vw, 2.9rem); }
.h3 { font-size: clamp(1.3rem, 2.6vw, 1.7rem); }
.lead { font-size: clamp(1.1rem, 2.2vw, 1.35rem); color: var(--ink-2); line-height: 1.5; }
.muted { color: var(--ink-2); }
.faint { color: var(--ink-3); }
.serif { font-family: var(--font-serif); }
em, .accent-em { font-style: italic; color: var(--accent-ink); }
strong { font-weight: 600; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .8rem 1.4rem;
  border-radius: 999px;
  font-weight: 500; font-size: .98rem;
  border: 1px solid var(--ink);
  transition: background var(--t), color var(--t), border-color var(--t), transform var(--t);
  will-change: transform;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn--primary:hover { background: var(--accent); border-color: var(--accent); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.btn--ghost:hover { border-color: var(--ink); }
.btn .arr { transition: transform var(--t); }
.btn:hover .arr { transform: translateX(3px); }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t), background var(--t);
}
.site-header.is-scrolled { border-bottom-color: var(--line); }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; height: 4.4rem; }
.brand { font-family: var(--font-mono); font-weight: 500; font-size: 1.02rem; letter-spacing: -.01em; display: inline-flex; align-items: baseline; gap: .12rem; }
.brand .dot { color: var(--accent); }
.nav-links { display: none; gap: 1.9rem; align-items: center; }
.nav-links a { font-size: .96rem; color: var(--ink-2); transition: color var(--t); position: relative; }
.nav-links a:hover { color: var(--ink); }
.nav-right { display: flex; align-items: center; gap: .9rem; }

/* language switcher */
.lang {
  display: inline-flex; align-items: center;
  border: 1px solid var(--line-2); border-radius: 999px; padding: 2px; gap: 2px;
  background: var(--surface);
}
.lang button {
  font-family: var(--font-mono);
  font-size: .72rem; letter-spacing: .06em; text-transform: uppercase;
  padding: .34rem .56rem; border-radius: 999px; color: var(--ink-3);
  transition: background var(--t), color var(--t);
  line-height: 1;
  min-height: 32px; display: inline-flex; align-items: center; justify-content: center;
}
.lang button[aria-pressed="true"] { background: var(--ink); color: #fff; }
.lang button:hover:not([aria-pressed="true"]) { color: var(--ink); }

.menu-btn { display: inline-flex; flex-direction: column; gap: 4px; padding: .5rem; }
.menu-btn span { width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform var(--t), opacity var(--t); }
.menu-btn.is-open span:nth-child(1){ transform: translateY(6px) rotate(45deg); }
.menu-btn.is-open span:nth-child(2){ opacity: 0; }
.menu-btn.is-open span:nth-child(3){ transform: translateY(-6px) rotate(-45deg); }

/* mobile drawer */
.mobile-nav {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--bg);
}
.mobile-nav.is-open { display: block; }
.mobile-nav ul { padding: .6rem var(--pad) 1.4rem; }
.mobile-nav a { display: block; font-family: var(--font-serif); font-size: 1.5rem; padding: .7rem 0; border-bottom: 1px solid var(--line); }

@media (min-width: 860px){
  .nav-links { display: flex; }
  .menu-btn { display: none; }
  .mobile-nav { display: none !important; }
}

/* ---------- Hero ---------- */
.hero { padding-block: clamp(3rem, 8vw, 6.5rem) clamp(2.5rem, 6vw, 4rem); position: relative; }
.hero .display { margin-top: 1.3rem; max-width: 16ch; }
.hero .display .accent-em { display: inline; }
.hero-sub { margin-top: 1.6rem; max-width: 56ch; }
.hero-cta { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: .8rem; }
.hero-meta { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 1.2rem 2rem; color: var(--ink-2); font-size: .95rem; }
.hero-meta .dotlabel { display: inline-flex; align-items: center; gap: .5rem; }
.hero-meta .pulse { width: .55rem; height: .55rem; border-radius: 50%; background: #1bbf73; box-shadow: 0 0 0 0 rgba(27,191,115,.5); }
@media (prefers-reduced-motion: no-preference){ .hero-meta .pulse { animation: pulse 2.4s infinite; } }
@keyframes pulse { 0%{ box-shadow:0 0 0 0 rgba(27,191,115,.45);} 70%{ box-shadow:0 0 0 9px rgba(27,191,115,0);} 100%{ box-shadow:0 0 0 0 rgba(27,191,115,0);} }

/* ---------- Stats band ---------- */
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border-block: 1px solid var(--line); }
.stat { background: var(--bg); padding: 1.6rem var(--pad); }
.stat .num { font-family: var(--font-serif); font-size: clamp(1.9rem, 5vw, 2.9rem); font-weight: 500; letter-spacing: -.02em; line-height: 1; }
.stat .lab { margin-top: .5rem; font-size: .86rem; color: var(--ink-2); }
@media (min-width: 760px){ .stats { grid-template-columns: repeat(4, 1fr); } .stat { padding-inline: clamp(1rem,3vw,2rem); } }
.stats.wrapped { max-width: var(--maxw); margin-inline: auto; }

/* ---------- Section heading ---------- */
.sec-head { display: flex; flex-direction: column; gap: .9rem; margin-bottom: clamp(2rem, 5vw, 3.2rem); }
.sec-head .h2 { max-width: 20ch; }
.sec-head .lead { max-width: 60ch; }

/* ---------- Cases list ---------- */
.cases { display: flex; flex-direction: column; }
.case-row {
  display: grid; grid-template-columns: 1fr; gap: 1.1rem;
  padding-block: clamp(1.8rem, 4vw, 2.6rem);
  border-top: 1px solid var(--line);
  transition: background var(--t);
  position: relative;
}
.case-row:last-child { border-bottom: 1px solid var(--line); }
.case-row:hover { background: linear-gradient(90deg, transparent, var(--accent-wash) 60%, transparent); }
.case-row .idx { font-family: var(--font-mono); font-size: .78rem; color: var(--ink-3); letter-spacing: .1em; }
.case-row .ctitle { font-family: var(--font-serif); font-size: clamp(1.5rem, 4vw, 2.3rem); font-weight: 500; line-height: 1.06; letter-spacing: -.01em; }
.case-row:hover .ctitle { color: var(--accent-ink); }
.case-row .cmeta { display: flex; flex-wrap: wrap; gap: .5rem .9rem; color: var(--ink-2); font-size: .9rem; margin-top: .2rem; }
.case-row .cresult { color: var(--ink-2); max-width: 60ch; margin-top: .6rem; }
.case-row .tags { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: 1rem; }
.case-thumb { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); aspect-ratio: 16/10; background: var(--surface); }
.case-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 500ms cubic-bezier(.4,0,.2,1); }
.case-row:hover .case-thumb img { transform: scale(1.03); }
.case-go { display: inline-flex; align-items: center; gap: .5rem; font-weight: 500; color: var(--ink); margin-top: 1.1rem; font-size: .96rem; }
.case-go .arr { transition: transform var(--t); }
.case-row:hover .case-go .arr { transform: translateX(4px); }
.case-row a.stretched::after { content:""; position:absolute; inset:0; }

@media (min-width: 820px){
  .case-row { grid-template-columns: 1.25fr .9fr; gap: 2.4rem; align-items: center; }
  .case-row .case-body { order: 1; }
  .case-thumb { order: 2; }
}

.tag {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .03em;
  color: var(--ink-2); background: var(--surface);
  border: 1px solid var(--line-2); border-radius: 999px; padding: .32rem .66rem; line-height: 1;
}

/* ---------- About / skills ---------- */
.about-grid { display: grid; grid-template-columns: 1fr; gap: clamp(2rem,5vw,3.5rem); }
@media (min-width: 880px){ .about-grid { grid-template-columns: 1.1fr .9fr; } }
.bio p + p { margin-top: 1.1rem; }
.skills { display: grid; gap: 1.4rem; }
.skill-group .skl-h { font-family: var(--font-mono); font-size: .76rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-3); margin-bottom: .7rem; }
.skill-group .chips { display: flex; flex-wrap: wrap; gap: .5rem; }

/* ---------- Contact ---------- */
.contact-card {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--surface); box-shadow: var(--shadow);
  padding: clamp(1.8rem, 5vw, 3.2rem);
  display: grid; gap: 1.4rem;
}
.email-row { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem; }
.email-link { font-family: var(--font-serif); font-size: clamp(1.4rem,4vw,2.1rem); font-weight: 500; color: var(--ink); border-bottom: 2px solid var(--accent); transition: color var(--t); overflow-wrap: anywhere; }
.email-link:hover { color: var(--accent-ink); }
.copy-btn { display: inline-flex; align-items: center; gap: .4rem; font-size: .82rem; font-family: var(--font-mono); color: var(--ink-2); border: 1px solid var(--line-2); border-radius: 999px; padding: .35rem .7rem; transition: border-color var(--t), color var(--t); }
.copy-btn:hover { border-color: var(--ink); color: var(--ink); }
.copy-btn.copied { color: #0a7a47; border-color: #0a7a47; }
.social { display: flex; flex-wrap: wrap; gap: 1.4rem; color: var(--ink-2); font-size: .95rem; }
.social a { display: inline-flex; align-items: center; gap: .45rem; transition: color var(--t); }
.social a:hover { color: var(--ink); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding-block: 2.6rem; }
.foot { display: flex; flex-direction: column; gap: 1.4rem; }
.foot-links { display: flex; flex-wrap: wrap; gap: 1.1rem; font-size: .92rem; color: var(--ink-2); }
.foot-links a:hover { color: var(--ink); }
.foot-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .6rem; color: var(--ink-3); font-size: .84rem; }
@media (min-width:760px){ .foot { flex-direction: row; justify-content: space-between; align-items: flex-start; } }

/* ============================================================
   Case detail pages
   ============================================================ */
.case-hero { padding-block: clamp(2.2rem,6vw,4rem) clamp(1.5rem,4vw,2.5rem); }
.backlink { display: inline-flex; align-items: center; gap: .45rem; font-size: .9rem; color: var(--ink-2); margin-bottom: 1.8rem; transition: color var(--t); }
.backlink:hover { color: var(--ink); }
.backlink .arr { transition: transform var(--t); }
.backlink:hover .arr { transform: translateX(-3px); }
.case-title { font-size: clamp(2.1rem, 6vw, 4rem); margin-top: 1rem; max-width: 18ch; line-height: 1.04; }
.case-intro { margin-top: 1.5rem; max-width: 60ch; }
.case-facts { display: flex; flex-wrap: wrap; gap: 1.2rem 2.4rem; margin-top: 2rem; padding-top: 1.6rem; border-top: 1px solid var(--line); }
.fact .fl { font-family: var(--font-mono); font-size: .7rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-3); }
.fact .fv { margin-top: .25rem; font-size: .98rem; }
.fact .fv a { border-bottom: 1px solid var(--line-2); }
.fact .fv a:hover { border-color: var(--accent); color: var(--accent-ink); }

.figure { margin-block: clamp(2rem,5vw,3.2rem); }
.figure img { width: 100%; border-radius: var(--radius); border: 1px solid var(--line); background: var(--surface); }
.figure figcaption { margin-top: .7rem; font-size: .85rem; color: var(--ink-3); font-family: var(--font-mono); }
.figure--wide img { box-shadow: var(--shadow); }

.result-cards { display: grid; grid-template-columns: repeat(2,1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (min-width:720px){ .result-cards { grid-template-columns: repeat(4,1fr); } }
.rc { background: var(--surface); padding: 1.5rem 1.3rem; }
.rc .rn { font-family: var(--font-serif); font-size: clamp(1.7rem,4.5vw,2.5rem); font-weight: 500; letter-spacing: -.02em; line-height: 1; }
.rc .rl { margin-top: .55rem; font-size: .85rem; color: var(--ink-2); }

.prose { max-width: 66ch; }
.prose h2 { font-size: clamp(1.5rem,3.4vw,2.1rem); margin-top: clamp(2.4rem,5vw,3.4rem); }
.prose h3 { font-size: 1.2rem; margin-top: 2rem; font-family: var(--font-sans); font-weight: 600; letter-spacing: 0; }
.prose p { margin-top: 1.05rem; color: var(--ink-2); }
.prose p strong { color: var(--ink); }
.prose ul.bullets { margin-top: 1.1rem; display: grid; gap: .7rem; }
.prose ul.bullets li { position: relative; padding-left: 1.5rem; color: var(--ink-2); }
.prose ul.bullets li::before { content:""; position:absolute; left:0; top:.66em; width:.5rem; height:.5rem; border-radius:50%; background: var(--accent); }
.prose a.inline { color: var(--accent-ink); border-bottom: 1px solid var(--line-2); }
.prose a.inline:hover { border-color: var(--accent); }

.callout { border-left: 3px solid var(--accent); background: var(--accent-wash); padding: 1.2rem 1.4rem; border-radius: 0 var(--radius) var(--radius) 0; margin-top: 1.6rem; }
.callout p { margin: 0; color: var(--ink); }

.channel-table { margin-top: 1.4rem; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.channel-table .crow { display: grid; grid-template-columns: 1fr auto; gap: .6rem 1rem; padding: .95rem 1.1rem; border-top: 1px solid var(--line); align-items: center; }
.channel-table .crow:first-child { border-top: 0; }
.channel-table .cn { font-weight: 600; font-size: .98rem; }
.channel-table .cd { font-size: .82rem; color: var(--ink-3); font-family: var(--font-mono); }
.channel-table .cstat { font-family: var(--font-mono); font-size: .86rem; color: var(--ink-2); text-align: right; white-space: nowrap; }

.gallery { display: grid; grid-template-columns: 1fr; gap: 1rem; margin-block: clamp(2rem,5vw,3rem); }
@media (min-width:680px){ .gallery.cols-2 { grid-template-columns: 1fr 1fr; } }
.gallery figure img { border-radius: var(--radius); border: 1px solid var(--line); }

/* funnel (google ads) */
.funnel { display: grid; gap: .7rem; margin-top: 1.6rem; }
.funnel .fstep { display: flex; align-items: center; gap: 1rem; border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; background: var(--surface); }
.funnel .fstep .fnum { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 500; color: var(--accent-ink); min-width: 2.5ch; }
.funnel .fstep .ftxt b { display: block; font-size: 1rem; }
.funnel .fstep .ftxt span { font-size: .86rem; color: var(--ink-2); }
.funnel .fstep:nth-child(1){ width: 100%; }
.funnel .fstep:nth-child(2){ width: 92%; }
.funnel .fstep:nth-child(3){ width: 80%; }
.funnel .fstep:nth-child(4){ width: 66%; border-color: var(--accent); background: var(--accent-wash); }

/* next case */
.next-case { border-top: 1px solid var(--line); margin-top: clamp(2.5rem,6vw,4rem); }
.next-case a { display: flex; flex-direction: column; gap: .5rem; padding-block: clamp(2rem,5vw,3rem); transition: color var(--t); }
.next-case a:hover .ncn { color: var(--accent-ink); }
.next-case .nck { font-family: var(--font-mono); font-size: .74rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-3); }
.next-case .ncn { font-family: var(--font-serif); font-size: clamp(1.6rem,4vw,2.4rem); font-weight: 500; }

/* CTA strip */
.cta-strip { background: var(--ink); color: #fff; border-radius: var(--radius-lg); padding: clamp(2rem,5vw,3.4rem); display: grid; gap: 1.3rem; }
.cta-strip .h2 { color: #fff; max-width: 22ch; }
.cta-strip .lead { color: rgba(255,255,255,.72); }
.cta-strip .btn--primary { background: #fff; color: var(--ink); border-color: #fff; }
.cta-strip .btn--primary:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.cta-strip .btn--ghost { color: #fff; border-color: rgba(255,255,255,.32); }
.cta-strip .btn--ghost:hover { border-color: #fff; }

/* ---------- Reveal animation (very light) ---------- */
.reveal { transition: opacity .6s ease, transform .6s cubic-bezier(.4,0,.2,1); }
.js .reveal:not(.in) { opacity: 0; transform: translateY(14px); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){ .reveal, .js .reveal:not(.in) { opacity: 1 !important; transform: none !important; transition: none; } }

/* skip link */
.skip { position: absolute; left: -999px; top: .5rem; background: var(--ink); color:#fff; padding: .6rem 1rem; border-radius: var(--radius); z-index: 100; }
.skip:focus { left: .5rem; }

/* utilities */
.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mt-3{margin-top:1.6rem}.mt-4{margin-top:2.4rem}
.center{text-align:center}.nowrap{white-space:nowrap}
.lang-only{display:none}