/* RS Development — Midnight Volt */
:root {
  --bg: #0B0D10;
  --surface: #111419;
  --surface-2: #161A21;
  --line: #1F242C;
  --line-2: #2A303A;
  --text: #F2F4F7;
  --muted: #9AA3AE;
  --dim: #6B7480;
  --volt: #C8F135;
  --volt-hover: #D8FF5C;
  --radius: 20px;
  --font-head: "Space Grotesk", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--volt); text-decoration: none; }
a:hover { color: var(--volt-hover); }
img, svg { display: block; max-width: 100%; }
h1, h2, h3 { font-family: var(--font-head); letter-spacing: -0.02em; line-height: 1.1; margin: 0; }
p { margin: 0; }
:focus-visible { outline: 2px solid var(--volt); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--volt); color: var(--bg); }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.mono { font-family: var(--font-mono); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 100; background: var(--volt); color: var(--bg); padding: 8px 14px; border-radius: 8px; }

/* Logo */
.logo { display: inline-flex; align-items: baseline; gap: 10px; color: var(--text); font-family: var(--font-head); font-weight: 500; font-size: 19px; letter-spacing: -0.01em; }
.logo:hover { color: var(--text); }
.mark { display: inline-flex; align-items: baseline; font-weight: 700; letter-spacing: -0.06em; }
.mark::after { content: ""; display: inline-block; width: 0.38em; height: 0.12em; margin-left: 0.08em; background: var(--volt); }
.cursor-blink::after { animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .cursor-blink::after { animation: none; } html { scroll-behavior: auto; } }

/* Header */
.header { position: sticky; top: 0; z-index: 50; background: rgba(11, 13, 16, 0.82); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 68px; gap: 24px; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: var(--muted); font-size: 14px; font-weight: 500; }
.nav a:hover { color: var(--text); }
.header-right { display: flex; align-items: center; gap: 16px; }
.lang { display: flex; gap: 2px; font-family: var(--font-mono); font-size: 12px; }
.lang a { color: var(--dim); padding: 6px 7px; border-radius: 6px; }
.lang a:hover { color: var(--text); }
.lang a[aria-current="true"] { color: var(--text); background: var(--surface-2); }
.menu-btn { display: none; background: none; border: 1px solid var(--line-2); color: var(--text); border-radius: 10px; width: 44px; height: 44px; cursor: pointer; align-items: center; justify-content: center; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 0 22px; border-radius: 12px; font-weight: 600; font-size: 15px; border: 1px solid transparent; cursor: pointer; transition: background .15s, border-color .15s, color .15s; font-family: var(--font-body); }
.btn-primary { background: var(--volt); color: var(--bg); }
.btn-primary:hover { background: var(--volt-hover); color: var(--bg); }
.btn-ghost { border-color: var(--line-2); color: var(--text); }
.btn-ghost:hover { border-color: var(--muted); color: var(--text); }
.btn-sm { min-height: 40px; padding: 0 16px; font-size: 14px; border-radius: 10px; }

/* Sections */
section { padding: 112px 0; border-top: 1px solid var(--line); }
.section-head { display: flex; flex-direction: column; gap: 14px; max-width: 720px; margin-bottom: 56px; }
.label { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--volt); }
.section-head h2 { font-size: clamp(32px, 4.4vw, 48px); font-weight: 700; }
.section-head p { color: var(--muted); font-size: 17px; }

/* Hero */
.hero { padding: 96px 0 104px; border-top: none; }
.hero .container { display: grid; grid-template-columns: 1.25fr 1fr; gap: 56px; align-items: center; }
.hero-eyebrow { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 22px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.hero-eyebrow .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--volt); box-shadow: 0 0 0 4px rgba(200, 241, 53, 0.15); }
.hero h1 { font-size: clamp(40px, 6vw, 68px); font-weight: 700; letter-spacing: -0.035em; line-height: 1.02; }
.hero h1 em { font-style: normal; color: var(--volt); }
.hero-text { color: var(--muted); font-size: 18px; max-width: 560px; margin-top: 24px; }
.hero-tagline { font-family: var(--font-mono); font-size: 14px; color: var(--text); margin-top: 18px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 36px; }
.terminal { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; font-family: var(--font-mono); font-size: 14px; }
.terminal-bar { display: flex; gap: 7px; padding: 14px 18px; border-bottom: 1px solid var(--line); align-items: center; }
.terminal-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--line-2); }
.terminal-bar b { margin-left: auto; font-weight: 500; font-size: 12px; color: var(--dim); }
.terminal-body { padding: 22px 22px 26px; display: flex; flex-direction: column; gap: 9px; color: var(--muted); }
.terminal-body .cmd { color: var(--text); }
.terminal-body .ok { color: var(--volt); }
.terminal-body .row { display: flex; justify-content: space-between; gap: 16px; }
.terminal-body .row span:last-child { color: var(--dim); }
.tagline-strip { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.2em; color: var(--muted); }
.tagline-strip b { color: var(--text); font-weight: 700; }

/* Services */
.service-groups { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.service-group { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px 28px; display: flex; flex-direction: column; gap: 22px; }
.service-group-head { display: flex; flex-direction: column; gap: 8px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.service-group-head .num { font-family: var(--font-mono); font-size: 13px; color: var(--dim); }
.service-group-head h3 { font-size: 30px; font-weight: 700; display: flex; align-items: baseline; }
.service-group-head h3::after { content: "."; color: var(--volt); }
.service-group-head p { color: var(--muted); font-size: 15px; }
.service-item h4 { margin: 0 0 6px; font-size: 16px; font-weight: 600; font-family: var(--font-body); }
.service-item p { color: var(--muted); font-size: 14.5px; }

/* Work */
.work-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.case { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; display: flex; flex-direction: column; gap: 16px; transition: border-color .2s, transform .2s; }
.case:hover { border-color: var(--line-2); transform: translateY(-2px); }
.case-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.case-num { font-family: var(--font-mono); font-size: 13px; color: var(--dim); }
.badge { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; padding: 4px 9px; border-radius: 999px; border: 1px solid var(--volt); color: var(--volt); white-space: nowrap; }
.case-cat { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; color: var(--muted); text-transform: uppercase; }
.case h3 { font-size: 22px; font-weight: 700; }
.case p { color: var(--muted); font-size: 15px; }
.case dl { margin: 0; display: flex; flex-direction: column; gap: 12px; }
.case dt { font-size: 12px; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--dim); margin-bottom: 3px; }
.case dd { margin: 0; font-size: 14.5px; color: var(--text); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; padding-top: 6px; }
.chip { font-family: var(--font-mono); font-size: 12px; padding: 5px 9px; border-radius: 8px; background: var(--surface-2); border: 1px solid var(--line); color: var(--muted); }
.case-featured { grid-column: span 3; display: grid; grid-template-columns: 1.1fr 1fr; gap: 32px; align-items: start; border-color: var(--line-2); }
.case-featured .case-main { display: flex; flex-direction: column; gap: 16px; }
.case-featured h3 { font-size: 30px; }

/* Process */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; counter-reset: step; }
.step { border-top: 2px solid var(--line-2); padding-top: 22px; display: flex; flex-direction: column; gap: 10px; }
.step:first-child { border-top-color: var(--volt); }
.step .num { font-family: var(--font-mono); color: var(--volt); font-size: 14px; }
.step h3 { font-size: 21px; font-weight: 700; }
.step p { color: var(--muted); font-size: 15px; }

/* Stack */
.stack-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.stack-group { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 22px 22px 24px; display: flex; flex-direction: column; gap: 14px; }
.stack-group h3 { font-size: 13px; font-family: var(--font-mono); font-weight: 500; text-transform: uppercase; letter-spacing: 0.12em; color: var(--volt); }

/* Why */
.why-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 20px; }
.why-item { display: flex; flex-direction: column; gap: 10px; padding: 24px 0; border-top: 1px solid var(--line-2); }
.why-item h3 { font-size: 19px; font-weight: 700; }
.why-item p { color: var(--muted); font-size: 15px; }

/* About */
.about-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 56px; align-items: start; }
.portrait { aspect-ratio: 4 / 5; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.portrait .mark { font-size: clamp(88px, 12vw, 140px); line-height: 1; }
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.about-text { display: flex; flex-direction: column; gap: 18px; }
.about-text p { color: var(--muted); font-size: 17px; }
.about-text p:first-of-type { color: var(--text); font-size: 20px; }
.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 32px; margin: 12px 0 0; padding: 24px 0 0; border-top: 1px solid var(--line); }
.facts dt { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--dim); }
.facts dd { margin: 2px 0 0; font-weight: 500; }
.why-rs { margin-top: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 24px 26px; display: flex; gap: 20px; align-items: flex-start; }
.why-rs .mark { font-size: 40px; line-height: 1; flex-shrink: 0; font-family: var(--font-head); }
.why-rs h3 { font-size: 18px; margin-bottom: 6px; }
.why-rs p { color: var(--muted); font-size: 15px; }
.why-rs strong { color: var(--text); }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 22px; }
.contact-info .lead { color: var(--muted); font-size: 17px; }
.contact-links { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.contact-link { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; color: var(--text); }
.contact-link:hover { border-color: var(--line-2); color: var(--text); }
.contact-link span:first-child { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--dim); }
.contact-link span:last-child { font-weight: 500; }
.contact-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding-top: 20px; border-top: 1px solid var(--line); }
.contact-meta dt { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--dim); }
.contact-meta dd { margin: 2px 0 0; font-weight: 500; }
.form { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; display: flex; flex-direction: column; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 8px; }
.field label { font-size: 14px; font-weight: 500; }
.field input, .field textarea, .field select { width: 100%; background: var(--bg); border: 1px solid var(--line-2); border-radius: 12px; color: var(--text); font: inherit; font-size: 15px; padding: 13px 14px; min-height: 48px; }
.field textarea { min-height: 140px; resize: vertical; }
.field select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: calc(100% - 20px) 21px, calc(100% - 15px) 21px; background-size: 5px 5px; background-repeat: no-repeat; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--volt); }
.field ::placeholder { color: var(--dim); }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-foot { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.form-note { font-size: 13px; color: var(--dim); max-width: 340px; }
.form-status { font-size: 14px; min-height: 20px; }
.form-status.ok { color: var(--volt); }
.form-status.err { color: #FF8A80; }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 36px 0; }
.footer .container { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; color: var(--dim); font-size: 14px; }
.footer .tagline { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.2em; color: var(--muted); }

/* Responsive */
@media (max-width: 1024px) {
  .hero .container, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .service-groups, .work-grid { grid-template-columns: 1fr 1fr; }
  .case-featured { grid-column: span 2; grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .portrait { max-width: 420px; }
}
@media (max-width: 760px) {
  section { padding: 80px 0; }
  .hero { padding: 56px 0 72px; }
  .container { padding: 0 16px; }
  .nav { display: none; position: absolute; top: 68px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; background: var(--bg); border-bottom: 1px solid var(--line); padding: 8px 16px 16px; }
  .nav.open { display: flex; }
  .nav a { padding: 14px 4px; font-size: 16px; border-bottom: 1px solid var(--line); }
  .menu-btn { display: inline-flex; }
  .header-right .btn { display: none; }
  .service-groups, .work-grid, .steps, .form-row, .facts { grid-template-columns: 1fr; }
  .case-featured { grid-column: span 1; }
  .form { padding: 22px; }
  .section-head { margin-bottom: 40px; }
  .why-rs { flex-direction: column; }
}

/* Защита от горизонтального переполнения на узких экранах */
.hero .container > *, .about-grid > *, .contact-grid > *, .work-grid > *, .service-groups > *, .steps > * { min-width: 0; }
.hero h1, .section-head h2, .case h3 { overflow-wrap: break-word; }
.terminal-body .row { flex-wrap: wrap; column-gap: 16px; row-gap: 0; }
body { overflow-x: clip; }
@media (max-width: 760px) {
  .terminal { font-size: 13px; }
  .hero-eyebrow { letter-spacing: 0.08em; }
  .lang a { padding: 6px 5px; }
}