/* ==========================================================================
   BIYCHUK GROWTH — Design System
   Black & white, blueprint-precision aesthetic for a construction-industry
   marketing agency. Signature device: architectural "registration mark"
   crosshairs (echoing drafting/blueprint corner ticks) + a single drawn
   ascending line in the hero that mirrors the logo's arrow.
   ========================================================================== */

:root {
  --ink: #000000;
  --paper: #ffffff;
  --mist: #f7f7f7;
  --line: #d9d9d9;
  --graphite: #4a4a4a;
  --max: 1280px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", "Manrope", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--ink); color: var(--paper); }

a:focus-visible, button:focus-visible, input:focus-visible,
textarea:focus-visible, select:focus-visible, summary:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

h1, h2, h3, h4 { margin: 0; font-weight: 800; letter-spacing: -0.03em; line-height: 1.08; }
h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); }
h2 { font-size: clamp(1.9rem, 3.4vw, 2.9rem); }
h3 { font-size: 1.25rem; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0; }

.container { max-width: var(--max); margin: 0 auto; padding: 0 1.5rem; }
@media (min-width: 768px) { .container { padding: 0 2.5rem; } }

.section { padding: clamp(4rem, 8vw, 7rem) 0; }
.section--alt { background: var(--mist); }
.section--dark { background: var(--ink); color: var(--paper); }

.eyebrow {
  display: inline-block; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--graphite); margin-bottom: 0.9rem;
}
.section--dark .eyebrow { color: #c9c9c9; }

.section-head { max-width: 760px; margin-bottom: clamp(2.5rem, 4vw, 3.5rem); }
.section-head p.lede { margin-top: 1rem; font-size: 1.08rem; color: var(--graphite); }
.section--dark .section-head p.lede { color: #d5d5d5; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.95rem 1.85rem; font-size: 0.95rem; font-weight: 600; border-radius: 2px;
  border: 1.5px solid var(--ink); cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: #1a1a1a; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: var(--paper); }
.section--dark .btn-outline { border-color: var(--paper); color: var(--paper); }
.section--dark .btn-outline:hover { background: var(--paper); color: var(--ink); }
.btn-sm { padding: 0.6rem 1.15rem; font-size: 0.85rem; }
.btn-arrow { transition: transform 0.18s ease; }
.btn:hover .btn-arrow { transform: translate(2px, -2px); }

/* ---------- Registration-mark corners (signature motif) ---------- */
.reg { position: relative; }
.reg::before, .reg::after { content: ""; position: absolute; width: 10px; height: 10px; pointer-events: none; }
.reg::before { top: -1px; left: -1px; border-top: 1.5px solid var(--ink); border-left: 1.5px solid var(--ink); }
.reg::after  { bottom: -1px; right: -1px; border-bottom: 1.5px solid var(--ink); border-right: 1.5px solid var(--ink); }
.reg-light::before, .reg-light::after { border-color: var(--paper); }

.blueprint-grid {
  background-image: linear-gradient(to right, #ececec 1px, transparent 1px),
    linear-gradient(to bottom, #ececec 1px, transparent 1px);
  background-size: 44px 44px;
}

/* ---------- Navbar ---------- */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 100; padding: 1.35rem 0;
  transition: background 0.25s ease, padding 0.25s ease, border-color 0.25s ease; border-bottom: 1px solid transparent; }
.navbar.is-solid { background: rgba(255,255,255,0.94); backdrop-filter: blur(8px); padding: 0.9rem 0; border-color: var(--line); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }

.logo { display: flex; align-items: center; gap: 0.6rem; font-weight: 800; font-size: 1.05rem; letter-spacing: -0.01em; }
.logo-mark { width: 34px; height: 34px; flex-shrink: 0; }
.logo-text { line-height: 1.05; }
.logo-text span { display: block; font-size: 0.62rem; font-weight: 600; letter-spacing: 0.12em; color: var(--graphite); text-transform: uppercase; }

.nav-links { display: none; align-items: center; gap: 2.1rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { font-size: 0.92rem; font-weight: 600; position: relative; padding: 0.2rem 0; }
.nav-links a::after { content: ""; position: absolute; left: 0; bottom: -3px; width: 0; height: 1.5px; background: var(--ink); transition: width 0.2s ease; }
.nav-links a:hover::after, .nav-links a[aria-current="page"]::after { width: 100%; }
@media (min-width: 960px) { .nav-links { display: flex; } }

.nav-cta { display: none; }
@media (min-width: 960px) { .nav-cta { display: inline-flex; } }

.burger { display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; width: 40px; height: 40px;
  border: 1.5px solid var(--ink); background: transparent; cursor: pointer; align-items: center; }
@media (min-width: 960px) { .burger { display: none; } }
.burger span { width: 18px; height: 1.5px; background: var(--ink); transition: transform 0.2s ease, opacity 0.2s ease; }
.burger.is-open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; }
.burger.is-open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.mobile-menu { position: fixed; inset: 0; top: 0; background: var(--paper); z-index: 99; padding: 6.5rem 1.5rem 2rem;
  display: none; flex-direction: column; gap: 0; overflow-y: auto; }
.mobile-menu.is-open { display: flex; }
.mobile-menu a { padding: 1.1rem 0; font-size: 1.4rem; font-weight: 700; border-bottom: 1px solid var(--line); }
.mobile-menu .btn { margin-top: 2rem; width: 100%; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 9.5rem 0 5rem; overflow: hidden; }
.hero .container { display: grid; gap: 3rem; align-items: center; }
@media (min-width: 1000px) { .hero .container { grid-template-columns: 1.05fr 0.85fr; } }
.hero h1 { max-width: 15ch; }
.hero .lede { margin-top: 1.5rem; font-size: 1.15rem; color: var(--graphite); max-width: 46ch; }
.hero-actions { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 1rem; }
.hero-stats { margin-top: 3.2rem; display: flex; gap: clamp(1.5rem,4vw,3rem); flex-wrap: wrap; }
.hero-stats div strong { display: block; font-size: 1.7rem; font-weight: 800; }
.hero-stats div span { font-size: 0.82rem; color: var(--graphite); }

.hero-graphic { position: relative; aspect-ratio: 1 / 1; }
.hero-graphic svg { width: 100%; height: 100%; }
.draw-path { stroke-dasharray: 900; stroke-dashoffset: 900; animation: draw 1.4s 0.2s ease forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }

/* ---------- Grids & cards ---------- */
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid-2 { grid-template-columns: repeat(2,1fr); } .grid-4 { grid-template-columns: repeat(2,1fr); } }
@media (min-width: 900px) { .grid-3 { grid-template-columns: repeat(3,1fr); } .grid-4 { grid-template-columns: repeat(4,1fr); } }

.card { border: 1px solid var(--line); background: var(--paper); padding: 2rem; transition: border-color 0.2s ease, transform 0.2s ease; }
.card:hover { border-color: var(--ink); }
.card .num { font-size: 0.78rem; font-weight: 700; color: var(--graphite); letter-spacing: 0.08em; }
.card h3 { margin-top: 0.9rem; }
.card p { margin-top: 0.7rem; color: var(--graphite); font-size: 0.96rem; }
.card ul { margin: 1rem 0 0; padding-left: 1.1rem; color: var(--graphite); font-size: 0.92rem; }
.card ul li { margin-bottom: 0.35rem; }
.card .card-cta { margin-top: 1.3rem; display: inline-block; font-weight: 700; font-size: 0.9rem; border-bottom: 1.5px solid var(--ink); }

.icon-box { width: 46px; height: 46px; border: 1.5px solid var(--ink); display: flex; align-items: center; justify-content: center; margin-bottom: 1.1rem; }
.icon-box svg { width: 22px; height: 22px; }

/* ---------- Positioning split ---------- */
.split { display: grid; gap: 3rem; }
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; align-items: start; } }
.check-list { list-style: none; margin: 1.6rem 0 0; padding: 0; display: grid; gap: 0.9rem; }
.check-list li { display: flex; gap: 0.8rem; font-size: 1rem; }
.check-list li svg { flex-shrink: 0; margin-top: 3px; }

/* ---------- Pricing ---------- */
.pricing-card { border: 1px solid var(--line); padding: 2.2rem; display: flex; flex-direction: column; background: var(--paper); }
.pricing-card.is-featured { border: 1.5px solid var(--ink); background: var(--mist); }
.pricing-card .price { margin-top: 1rem; font-size: 2.1rem; font-weight: 800; letter-spacing: -0.02em; }
.pricing-card .price small { font-size: 0.95rem; font-weight: 600; color: var(--graphite); }
.pricing-card p.desc { margin-top: 0.9rem; color: var(--graphite); font-size: 0.94rem; flex-grow: 1; }
.pricing-note { margin-top: 2.5rem; font-size: 0.88rem; color: var(--graphite); border-top: 1px solid var(--line); padding-top: 1.5rem; }

/* ---------- Budget table ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); }
table.budget { width: 100%; border-collapse: collapse; min-width: 480px; }
table.budget th, table.budget td { text-align: left; padding: 1.1rem 1.4rem; font-size: 0.95rem; }
table.budget thead th { background: var(--ink); color: var(--paper); font-weight: 700; text-transform: uppercase; font-size: 0.78rem; letter-spacing: 0.08em; }
table.budget tbody tr:not(:last-child) td { border-bottom: 1px solid var(--line); }
table.budget td:last-child, table.budget th:last-child { font-weight: 700; }

/* ---------- Industries ---------- */
.industry-card { border: 1px solid var(--line); padding: 2rem; display: flex; flex-direction: column; height: 100%; }
.industry-card h3 { margin-top: 0.2rem; }
.industry-card p.desc { margin-top: 0.7rem; color: var(--graphite); font-size: 0.94rem; }
.industry-card .exp-block { margin-top: 1.4rem; padding: 1.1rem 1.2rem; background: var(--mist); border-left: 2px solid var(--ink); font-size: 0.88rem; color: var(--graphite); }
.industry-card .exp-block strong { display: block; color: var(--ink); font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 0.4rem; }
.industry-card .card-cta { margin-top: auto; padding-top: 1.4rem; }

/* ---------- Process timeline ---------- */
.timeline { display: grid; gap: 1.5rem; }
@media (min-width: 900px) { .timeline { grid-template-columns: repeat(4,1fr); } }
.timeline-step { border-top: 2px solid var(--ink); padding-top: 1.4rem; }
.timeline-step .step-index { font-size: 2.2rem; font-weight: 800; color: var(--line); }
.timeline-step h3 { margin-top: 0.6rem; }
.timeline-step p { margin-top: 0.6rem; color: var(--graphite); font-size: 0.92rem; }

/* ---------- Case studies ---------- */
.case-card { border: 1px solid var(--line); padding: 2rem; }
.case-card .eyebrow { margin-bottom: 0.6rem; }
.case-card dl { margin: 1.2rem 0 0; display: grid; gap: 1rem; }
.case-card dt { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--graphite); }
.case-card dd { margin: 0.3rem 0 0; font-size: 0.94rem; }

/* ---------- FAQ ---------- */
.faq-list { display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { cursor: pointer; list-style: none; padding: 1.5rem 0; font-weight: 700; font-size: 1.02rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .faq-icon { flex-shrink: 0; width: 22px; height: 22px; border: 1.5px solid var(--ink); position: relative; }
.faq-item .faq-icon::before, .faq-item .faq-icon::after { content: ""; position: absolute; background: var(--ink); top: 50%; left: 50%; transform: translate(-50%,-50%); }
.faq-item .faq-icon::before { width: 10px; height: 1.5px; }
.faq-item .faq-icon::after { width: 1.5px; height: 10px; transition: transform 0.2s ease; }
.faq-item[open] .faq-icon::after { transform: translate(-50%,-50%) rotate(90deg) scaleY(0); }
.faq-item .faq-answer { padding: 0 0 1.6rem; color: var(--graphite); font-size: 0.96rem; max-width: 68ch; }

/* ---------- Contact / forms ---------- */
.contact-grid { display: grid; gap: 3rem; }
@media (min-width: 960px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.field { margin-bottom: 1.3rem; }
.field label { display: block; font-size: 0.82rem; font-weight: 700; margin-bottom: 0.5rem; letter-spacing: 0.02em; }
.field input, .field select, .field textarea {
  width: 100%; padding: 0.85rem 1rem; border: 1px solid var(--line); background: var(--paper);
  font-family: inherit; font-size: 0.96rem; color: var(--ink);
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--ink); outline: none; }
.field textarea { resize: vertical; min-height: 120px; }
.field .error-msg { display: none; color: #b00020; font-size: 0.8rem; margin-top: 0.4rem; }
.field.has-error input, .field.has-error select, .field.has-error textarea { border-color: #b00020; }
.field.has-error .error-msg { display: block; }
.form-note { margin-top: 1rem; font-size: 0.85rem; color: var(--graphite); }
.form-success { display: none; padding: 1.4rem; border: 1.5px solid var(--ink); background: var(--mist); font-weight: 600; margin-top: 1rem; }
.form-success.is-visible { display: block; }

.contact-info-list { list-style: none; margin: 1.6rem 0 0; padding: 0; display: grid; gap: 1.4rem; }
.contact-info-list li { border-top: 1px solid var(--line); padding-top: 1.1rem; }
.contact-info-list .label { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--graphite); }
.contact-info-list .value { font-size: 1.1rem; font-weight: 700; margin-top: 0.3rem; }

/* ---------- CTA band ---------- */
.cta-band { text-align: center; }
.cta-band h2 { max-width: 22ch; margin: 0 auto; }
.cta-band .lede { max-width: 52ch; margin: 1.2rem auto 0; color: #d5d5d5; }
.cta-band .hero-actions { justify-content: center; margin-top: 2.2rem; }

/* ---------- Footer ---------- */
footer { background: var(--ink); color: var(--paper); padding: 4.5rem 0 2rem; }
.footer-top { display: grid; gap: 2.5rem; }
@media (min-width: 900px) { .footer-top { grid-template-columns: 1.3fr 1fr 1fr 1fr; } }
.footer-brand p { margin-top: 1rem; color: #b8b8b8; font-size: 0.92rem; max-width: 32ch; }
.footer-col h4 { font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; color: #9c9c9c; margin-bottom: 1.1rem; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.7rem; }
.footer-col a { font-size: 0.92rem; color: #e6e6e6; }
.footer-col a:hover { color: var(--paper); text-decoration: underline; }
.footer-bottom { margin-top: 3.5rem; padding-top: 1.8rem; border-top: 1px solid #2c2c2c; display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; font-size: 0.82rem; color: #9c9c9c; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { font-size: 0.82rem; color: var(--graphite); margin-bottom: 1.5rem; }
.breadcrumb a { font-weight: 600; }
.breadcrumb a:hover { text-decoration: underline; }

/* ---------- Related industries ---------- */
.related-list { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.8rem; }
.related-list a { border: 1px solid var(--line); padding: 0.6rem 1.1rem; font-size: 0.88rem; font-weight: 600;
  transition: border-color 0.2s ease, background 0.2s ease; }
.related-list a:hover { border-color: var(--ink); background: var(--mist); }

/* ---------- Page hero (inner pages) ---------- */
.page-hero { padding: 9rem 0 4rem; }
.page-hero .eyebrow { margin-bottom: 1rem; }
.page-hero p.lede { margin-top: 1.3rem; font-size: 1.1rem; color: var(--graphite); max-width: 60ch; }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mt-lg { margin-top: 2.5rem; }
.animate-in { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-in.is-visible { opacity: 1; transform: translateY(0); }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--ink); color: var(--paper); padding: 0.8rem 1.2rem; z-index: 200; }
.skip-link:focus { left: 1rem; top: 1rem; }

/* Biychuk Growth refinements */
.logo-img {
  width: 38px;
  height: 38px;
  object-fit: cover;
  border: 1px solid var(--line);
}
footer .logo-img { border-color: #2c2c2c; }
.growth-chart rect { shape-rendering: geometricPrecision; }
.service-kicker {
  margin-top: 0.35rem !important;
  color: var(--graphite);
  font-size: 0.82rem !important;
  font-weight: 600;
}
.quick-contact-section { padding: 2.4rem 0; }
.quick-contact {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-top: 1.8rem;
  padding-bottom: 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.quick-contact h2 { font-size: clamp(1.45rem, 2.5vw, 2rem); }
.quick-contact .lede { margin-top: 0.6rem; color: var(--graphite); max-width: 62ch; }
@media (max-width: 640px) {
  .btn { max-width: 100%; white-space: normal; text-align: center; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; padding-left: 1rem; padding-right: 1rem; }
  .quick-contact { align-items: stretch; flex-direction: column; }
  .quick-contact .btn { width: 100%; }
}