/* ==========================================================================
   diag36 — автодиагностика в Воронеже
   Чистый HTML/CSS/JS. Тёмная «приборная» тема: графит + янтарный
   (цвет лампы Check Engine), моноширинные «данные» и осциллографная сетка.
   ========================================================================== */

/* ---------- Токены ---------- */
:root {
  --bg: #101418;
  --bg-soft: #0d1115;
  --panel: #161c23;
  --panel-2: #1b242d;
  --line: #26303b;
  --line-soft: #1e2731;

  --amber: #ffb020;
  --amber-hi: #ffc24d;
  --amber-dim: rgba(255, 176, 32, 0.12);
  --amber-line: rgba(255, 176, 32, 0.35);

  --text: #f2f5f8;
  --body: #c3ccd5;
  --dim: #85929f;

  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --display: "Russo One", "Arial Black", sans-serif;
  --sans: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;

  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --header-h: 72px;
}

/* ---------- Сброс и база ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: var(--amber); }
h1, h2, h3, h4 { margin: 0; color: var(--text); line-height: 1.15; }

::selection { background: var(--amber); color: #14181d; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Кнопки ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 26px;
  border-radius: 12px;
  border: 1px solid transparent;
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.22s ease, border-color 0.22s ease,
    color 0.22s ease, transform 0.22s ease, box-shadow 0.22s ease;
}
.btn svg { flex: none; }
.btn--amber { background: var(--amber); color: #14181d; }
.btn--amber:hover {
  background: var(--amber-hi);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255, 176, 32, 0.28);
}
.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}
.btn--ghost:hover {
  border-color: var(--amber-line);
  color: var(--amber);
  transform: translateY(-2px);
}
.btn--lg { padding: 18px 34px; font-size: 1.08rem; }
.btn--sm { padding: 11px 18px; font-size: 0.9rem; }

/* ---------- Чипы ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.73rem;
  letter-spacing: 0.08em;
  color: var(--body);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  white-space: nowrap;
}
.chip::before { content: "●"; font-size: 0.55rem; color: var(--amber); }
.chip--amber { color: var(--amber); border-color: var(--amber-line); }
.chip--amber::before { content: "■"; font-size: 0.5rem; }

/* ---------- Шапка ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(16, 20, 24, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.site-head.is-scrolled { background: rgba(13, 16, 20, 0.96); }
.head-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: var(--header-h);
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.logo svg { flex: none; }
.logo b { color: var(--amber); font-weight: 400; }
.head-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
}
.head-nav a {
  color: var(--body);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  transition: color 0.2s ease;
}
.head-nav a:hover { color: var(--amber); }
.head-phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}
.head-phone:hover { color: var(--amber); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 84px 0 0; }
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.35;
  mask-image: linear-gradient(180deg, #000 30%, transparent 90%);
  -webkit-mask-image: linear-gradient(180deg, #000 30%, transparent 90%);
  pointer-events: none;
}
.hero-inner { position: relative; }
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}
.hero-eyebrow::before { content: ""; width: 30px; height: 1px; background: var(--amber); }
.hero h1 {
  font-family: var(--display);
  font-size: clamp(2.1rem, 6vw, 4rem);
  text-transform: uppercase;
  margin: 22px 0 20px;
  max-width: 15em;
}
.hero h1 .accent { color: var(--amber); }
.hero-sub {
  font-size: 1.1rem;
  color: var(--body);
  max-width: 640px;
  margin: 0;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 40px; }

/* Сетка hero: текст слева, фото справа */
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 52px;
  align-items: center;
}
.hero-media { margin: 0; position: relative; }
.hero-photo {
  width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--amber-line);
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 176, 32, 0.08), 0 0 44px rgba(255, 176, 32, 0.14);
}
/* Уголки-«визир» вокруг фото */
.hero-media::before {
  content: "";
  position: absolute;
  inset: -13px;
  background:
    linear-gradient(var(--amber), var(--amber)) top left / 26px 2px,
    linear-gradient(var(--amber), var(--amber)) top left / 2px 26px,
    linear-gradient(var(--amber), var(--amber)) top right / 26px 2px,
    linear-gradient(var(--amber), var(--amber)) top right / 2px 26px,
    linear-gradient(var(--amber), var(--amber)) bottom left / 26px 2px,
    linear-gradient(var(--amber), var(--amber)) bottom left / 2px 26px,
    linear-gradient(var(--amber), var(--amber)) bottom right / 26px 2px,
    linear-gradient(var(--amber), var(--amber)) bottom right / 2px 26px;
  background-repeat: no-repeat;
  opacity: 0.75;
  pointer-events: none;
}
.hero-caption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
}
.hero-caption b { color: var(--amber); font-weight: 500; }

/* Осциллографная волна */
.wave { margin: 70px -24px 0; position: relative; }
.wave svg { width: 100%; height: auto; }
.wave .grid { stroke: var(--line); stroke-width: 1; opacity: 0.55; }
.wave .trace {
  fill: none;
  stroke: var(--amber);
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 7px rgba(255, 176, 32, 0.55));
  stroke-dasharray: 1800;
  stroke-dashoffset: 1800;
  animation: trace-loop 6s linear infinite;
}
.wave .dot { fill: var(--amber); filter: drop-shadow(0 0 5px rgba(255, 176, 32, 0.9)); }

/* Зацикленный цикл: линия рисуется, держится, плавно гаснет и рисуется снова */
@keyframes trace-loop {
  0%   { stroke-dashoffset: 1800; opacity: 0; }
  4%   { opacity: 1; }
  50%  { stroke-dashoffset: 0; }
  84%  { stroke-dashoffset: 0; opacity: 1; }
  94%  { opacity: 0; }
  100% { stroke-dashoffset: 1800; opacity: 0; }
}

.wave-readout {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dim);
  padding: 14px 24px 0;
}
.wave-readout b { color: var(--amber); font-weight: 500; }

/* ---------- Секции ---------- */
.sec { padding: 96px 0; }
.sec--alt { background: linear-gradient(180deg, transparent, rgba(255, 176, 32, 0.03) 45%, transparent); }
.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}
.eyebrow::before { content: ""; width: 30px; height: 1px; background: var(--amber); }
.sec-title {
  font-family: var(--display);
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  margin: 16px 0 12px;
}
.sec-lead { color: var(--body); max-width: 660px; margin: 0; }

/* ---------- Карточки услуг ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(255px, 1fr));
  gap: 18px;
  margin-top: 46px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--amber-line);
  background: var(--panel-2);
}
.card-code {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--dim);
  text-transform: uppercase;
}
.card-code svg { color: var(--amber); }
.card h3 { font-family: var(--display); font-size: 1.1rem; margin: 16px 0 10px; }
.card p { color: var(--body); font-size: 0.94rem; margin: 0; }

/* ---------- Марки ---------- */
.brands { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 36px; }
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--body);
  text-decoration: none;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 11px 16px;
  transition: color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.brand-link::before { content: "▸"; color: var(--amber); font-size: 0.8rem; }
.brand-link:hover {
  color: var(--amber);
  border-color: var(--amber-line);
  transform: translateY(-2px);
}
.brands-note { margin-top: 24px; color: var(--dim); font-size: 0.9rem; }

/* ---------- Шаги (процесс — это последовательность, нумерация уместна) ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 46px;
  counter-reset: step;
}
.step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  counter-increment: step;
  position: relative;
}
.step::after {
  content: "0" counter(step);
  position: absolute;
  top: 18px;
  right: 20px;
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--amber-line);
}
.step h3 { font-family: var(--display); font-size: 1.05rem; margin: 0 0 10px; }
.step p { color: var(--body); font-size: 0.92rem; margin: 0; }
.step-ico { color: var(--amber); margin-bottom: 14px; }

/* ---------- Контакты ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: start;
  margin-top: 46px;
}
.contact-phone {
  display: inline-block;
  font-family: var(--display);
  font-size: clamp(1.6rem, 4.2vw, 2.7rem);
  color: var(--text);
  text-decoration: none;
  margin: 8px 0 6px;
  transition: color 0.2s ease;
}
.contact-phone:hover { color: var(--amber); }
.contact-tg {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 1.05rem;
  color: var(--body);
  text-decoration: none;
  transition: color 0.2s ease;
}
.contact-tg:hover { color: var(--amber); }
.contact-notes { margin-top: 26px; display: grid; gap: 10px; }
.contact-note {
  display: flex;
  gap: 10px;
  align-items: baseline;
  color: var(--dim);
  font-size: 0.92rem;
}
.contact-note b { color: var(--body); font-weight: 600; }
.contact-note::before { content: "//"; font-family: var(--mono); color: var(--amber); font-size: 0.8rem; }

/* CTA-полоса */
.cta-band {
  margin-top: 60px;
  background: linear-gradient(135deg, var(--amber-dim), rgba(255, 176, 32, 0.02));
  border: 1px solid var(--amber-line);
  border-radius: 18px;
  padding: 38px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 26px;
  flex-wrap: wrap;
}
.cta-band h3 { font-family: var(--display); font-size: 1.35rem; margin: 0 0 8px; }
.cta-band p { color: var(--body); margin: 0; font-size: 0.96rem; }
.cta-band .btn { flex: none; }

/* ---------- Подвал ---------- */
.site-foot { border-top: 1px solid var(--line-soft); background: var(--bg-soft); }
.foot-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  padding: 34px 24px;
  color: var(--dim);
  font-size: 0.85rem;
}
.foot-inner .logo { font-size: 1.05rem; color: var(--dim); }
.foot-inner .logo b { color: var(--amber); }
.foot-links { display: flex; gap: 20px; flex-wrap: wrap; }
.foot-links a { color: var(--dim); text-decoration: none; transition: color 0.2s ease; }
.foot-links a:hover { color: var(--amber); }

/* ---------- Хлебные крошки (страницы марок) ---------- */
.crumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 30px;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}
.crumbs a { color: var(--body); text-decoration: none; transition: color 0.2s ease; }
.crumbs a:hover { color: var(--amber); }
.crumbs span { color: var(--amber); }

/* ---------- Контент страниц марок ---------- */
.page-head { position: relative; padding-bottom: 8px; }
.page-head::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.3;
  mask-image: linear-gradient(180deg, #000 20%, transparent 100%);
  -webkit-mask-image: linear-gradient(180deg, #000 20%, transparent 100%);
  pointer-events: none;
}
.page-head-inner { position: relative; padding: 26px 0 56px; }
.page-head h1 {
  font-family: var(--display);
  font-size: clamp(1.9rem, 4.6vw, 3rem);
  text-transform: uppercase;
  margin: 20px 0 16px;
}
.page-head h1 .accent { color: var(--amber); }
.page-lead { font-size: 1.08rem; color: var(--body); max-width: 720px; margin: 0; }

.prose { margin-top: 8px; }
.prose h2 {
  font-family: var(--display);
  font-size: 1.45rem;
  margin: 0 0 16px;
}
.prose p { color: var(--body); margin: 0 0 16px; }
.prose ul { list-style: none; margin: 0 0 20px; padding: 0; display: grid; gap: 10px; }
.prose li { position: relative; padding-left: 26px; color: var(--body); }
.prose li::before { content: "▸"; position: absolute; left: 2px; color: var(--amber); }
.prose .check li::before { content: "✓"; color: var(--amber); font-weight: 700; }

/* Чипы моделей */
.models { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0 0; }
.model-chip {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--body);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 12px;
}

/* FAQ */
.faq { display: grid; gap: 12px; margin-top: 8px; }
.faq-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item[open] { border-color: var(--amber-line); }
.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 46px 20px 22px;
  font-weight: 700;
  color: var(--text);
  position: relative;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 1.2rem;
  color: var(--amber);
  transition: transform 0.2s ease;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-a { padding: 0 22px 20px; color: var(--body); font-size: 0.95rem; }

/* ---------- Появление при скролле ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- Адаптив ---------- */
@media (max-width: 900px) {
  .contact-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-media { max-width: 460px; margin: 0 auto; }
}
@media (max-width: 820px) {
  .head-nav { display: none; }
  .sec { padding: 72px 0; }
  .hero { padding-top: 60px; }
  .cta-band { padding: 30px 26px; }
  .wave { margin-top: 50px; }
}
@media (max-width: 480px) {
  .head-phone .phone-full { display: none; }
  .btn--lg { padding: 16px 26px; }
}

/* ---------- Уважение к prefers-reduced-motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .wave .trace { stroke-dasharray: none; stroke-dashoffset: 0; }
  .reveal { opacity: 1; transform: none; }
}