/* СЛЕД — forensic bureau aesthetic */
:root {
  --ink: #12151c;
  --ink-soft: #1c212b;
  --paper: #d9d4c8;
  --paper-bright: #ebe6da;
  --steel: #5c6b7a;
  --fog: #8a93a0;
  --stamp: #b91c2c;
  --stamp-glow: rgba(185, 28, 44, 0.35);
  --line: rgba(217, 212, 200, 0.14);
  --font-display: "Syne", system-ui, sans-serif;
  --font-body: "Instrument Sans", system-ui, sans-serif;
  --font-stamp: "Special Elite", cursive;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --pad: clamp(1.25rem, 4vw, 3.5rem);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.95rem + 0.2vw, 1.125rem);
  line-height: 1.55;
  color: var(--paper);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(92, 107, 122, 0.22), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(185, 28, 44, 0.08), transparent 50%),
    linear-gradient(165deg, #0f1218 0%, #171b24 45%, #10131a 100%);
  min-height: 100vh;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0;
}

p {
  margin: 0;
}

.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem var(--pad);
  background: linear-gradient(to bottom, rgba(18, 21, 28, 0.92), rgba(18, 21, 28, 0));
  transition: background 0.4s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(18, 21, 28, 0.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.logo {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  align-items: flex-start;
}

.logo-mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.2em;
  line-height: 1;
  color: var(--paper-bright);
}

.logo-sub {
  font-size: 0.55rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fog);
  padding-left: 0.05rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav a {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fog);
  transition: color 0.25s;
}

.nav a:hover {
  color: var(--paper-bright);
}

.nav-cta {
  color: var(--paper-bright) !important;
  border: 1px solid var(--line);
  padding: 0.45rem 0.9rem;
}

.nav-cta:hover {
  border-color: var(--stamp);
  color: var(--paper-bright) !important;
}

.menu-toggle {
  display: none;
  background: none;
  border: 0;
  width: 2rem;
  height: 1.25rem;
  padding: 0;
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--paper);
  transition: transform 0.3s var(--ease);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  padding: 0;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-parallax {
  position: absolute;
  will-change: transform;
}

.hero-parallax-bg {
  inset: -10% 0;
}

.hero-parallax-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% 42%;
  transform: scale(1.1);
  filter: contrast(1.18) brightness(0.82) saturate(1.08);
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(0, 0, 0, 0.96) 8%, rgba(0, 0, 0, 0.28) 44%, rgba(0, 0, 0, 0.08) 72%),
    linear-gradient(90deg, rgba(0, 0, 0, 0.78) 0%, rgba(0, 0, 0, 0.22) 42%, transparent 70%),
    radial-gradient(ellipse at 72% 38%, transparent 14%, rgba(0, 0, 0, 0.4) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: clamp(6rem, 14vh, 9rem) var(--pad) clamp(3rem, 8vh, 5rem);
  max-width: 42rem;
  animation: rise 1s var(--ease) both;
}

.brand-hero-logo {
  display: block;
  width: min(100%, 16rem);
  height: auto;
  margin-bottom: 1.5rem;
  filter: drop-shadow(0 8px 28px rgba(0, 0, 0, 0.45));
  animation: rise 1s var(--ease) both;
}

.brand-hero {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.5rem, 12vw, 7.5rem);
  letter-spacing: 0.12em;
  line-height: 0.9;
  margin-bottom: 1.25rem;
  color: var(--paper-bright);
  text-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
}

.hero h1 {
  font-size: clamp(1.35rem, 2.8vw, 2rem);
  font-weight: 600;
  max-width: 18ch;
  margin-bottom: 1rem;
  color: var(--paper-bright);
}

.hero-lead {
  color: var(--fog);
  max-width: 36ch;
  margin-bottom: 1.75rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-stamp {
  position: absolute;
  right: var(--pad);
  bottom: clamp(3rem, 8vh, 5rem);
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-family: var(--font-stamp);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--stamp);
  border: 2px solid var(--stamp);
  padding: 0.75rem 1rem;
  transform: rotate(-8deg);
  opacity: 0;
  animation: stamp-in 0.8s var(--ease) 0.6s both;
  box-shadow: 0 0 0 1px rgba(185, 28, 44, 0.2) inset;
}

.hero-stamp span:last-child {
  color: var(--paper);
  opacity: 0.7;
  font-size: 0.7rem;
}

@media (max-width: 700px) {
  .hero-stamp {
    display: none;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.85rem 1.4rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s, border-color 0.25s, color 0.25s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--stamp);
  color: #fff;
  border-color: var(--stamp);
  box-shadow: 0 8px 28px var(--stamp-glow);
}

.btn-primary:hover {
  background: #d02436;
}

.btn-ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--line);
}

.btn-ghost:hover {
  border-color: var(--fog);
}

/* Sections */
.section-head {
  max-width: 36rem;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.eyebrow {
  font-family: var(--font-stamp);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  color: var(--stamp);
  margin-bottom: 0.75rem;
}

.section-head h2 {
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  margin-bottom: 0.75rem;
  color: var(--paper-bright);
}

.section-lead {
  color: var(--fog);
  max-width: 38ch;
}

.method,
.cases,
.kit,
.voices,
.audience,
.faq {
  padding: clamp(4rem, 10vh, 7rem) var(--pad);
}

/* Method steps */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}

.step {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: calc(var(--i) * 0.1s);
}

.step.is-in {
  opacity: 1;
  transform: none;
}

.step-num {
  display: block;
  font-family: var(--font-stamp);
  color: var(--stamp);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  letter-spacing: 0.08em;
}

.step h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--paper-bright);
}

.step p {
  color: var(--fog);
  font-size: 0.95rem;
}

/* Cases — not cards: editorial rows */
.case-list {
  display: flex;
  flex-direction: column;
  gap: clamp(3rem, 8vw, 5.5rem);
}

.case-row {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.case-row.is-in {
  opacity: 1;
  transform: none;
}

.case-row.reverse {
  grid-template-columns: 1fr 1.15fr;
}

.case-row.reverse .case-visual {
  order: 2;
}

.case-row.reverse .case-body {
  order: 1;
  text-align: right;
  margin-left: auto;
}

.case-row.reverse .case-meta,
.case-row.reverse .section-lead {
  margin-left: auto;
}

.case-visual {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}

.case-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.08) brightness(0.92);
  transition: transform 1.2s var(--ease), filter 0.6s;
}

.case-row:hover .case-visual img {
  transform: scale(1.045);
  filter: saturate(0.95) contrast(1.1) brightness(0.98);
}

.case-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(185, 28, 44, 0.12), transparent 40%),
    radial-gradient(ellipse at center, transparent 50%, rgba(18, 21, 28, 0.35) 100%);
  mix-blend-mode: multiply;
  opacity: 0.85;
}

.case-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to top, rgba(18, 21, 28, 0.7), transparent 50%);
  pointer-events: none;
}

.case-code {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  z-index: 2;
  font-family: var(--font-stamp);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--paper-bright);
  background: rgba(18, 21, 28, 0.72);
  border: 1px solid rgba(185, 28, 44, 0.45);
  padding: 0.35rem 0.6rem;
}

.case-meta {
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 0.65rem;
}

.case-body h3 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin-bottom: 0.85rem;
  color: var(--paper-bright);
}

.case-body p {
  color: var(--fog);
  margin-bottom: 1.25rem;
  max-width: 38ch;
}

.case-row.reverse .case-body p {
  margin-left: auto;
}

.text-link {
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper-bright);
  border-bottom: 1px solid var(--stamp);
  padding-bottom: 0.15rem;
  transition: color 0.25s, border-color 0.25s;
}

.text-link:hover {
  color: var(--stamp);
}

/* Kit */
.kit {
  background:
    linear-gradient(180deg, transparent, rgba(28, 33, 43, 0.65) 20%, rgba(28, 33, 43, 0.65) 80%, transparent);
}

.kit-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
  margin-bottom: 3rem;
}

.kit-photo {
  margin: 0 0 3rem;
  overflow: hidden;
  aspect-ratio: 1400 / 933;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
  position: relative;
}

.kit-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.9) contrast(1.05);
}

.kit-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 60px rgba(18, 21, 28, 0.35);
  background: linear-gradient(to top, rgba(18, 21, 28, 0.25), transparent 40%);
}

.evidence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.evidence-list li {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
  font-family: var(--font-stamp);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  opacity: 0;
  transform: translateX(12px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.evidence-list li.is-in {
  opacity: 1;
  transform: none;
}

.evidence-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--stamp);
  flex-shrink: 0;
}

.kit-banner {
  overflow: hidden;
  border-block: 1px solid var(--line);
  padding: 1rem 0;
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}

.kit-banner-track {
  display: flex;
  gap: 1.5rem;
  width: max-content;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.25rem, 3vw, 2rem);
  letter-spacing: 0.2em;
  color: var(--steel);
  animation: marquee 28s linear infinite;
}

/* Voices */
.quotes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.quotes blockquote {
  margin: 0;
  padding-top: 1.25rem;
  border-top: 2px solid var(--stamp);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.quotes blockquote.is-in {
  opacity: 1;
  transform: none;
}

.quotes p {
  font-size: 1.05rem;
  color: var(--paper);
  margin-bottom: 1rem;
}

.quotes cite {
  font-style: normal;
  font-size: 0.85rem;
  color: var(--fog);
  letter-spacing: 0.04em;
}

/* Audience */
.audience-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}

.audience-list h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--paper-bright);
}

.audience-list p {
  color: var(--fog);
  font-size: 0.95rem;
  max-width: 34ch;
}

/* FAQ */
.faq-list {
  max-width: 44rem;
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
  padding: 1.15rem 0;
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--paper-bright);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  font-family: var(--font-stamp);
  color: var(--stamp);
  font-size: 1.25rem;
  line-height: 1;
  flex-shrink: 0;
}

.faq-list details[open] summary::after {
  content: "–";
}

.faq-list details p {
  margin: 0.85rem 0 0.25rem;
  color: var(--fog);
  max-width: 52ch;
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  flex-wrap: wrap;
  padding: 2.5rem var(--pad) 3rem;
  border-top: 1px solid var(--line);
}

.footer-brand p {
  margin-top: 0.5rem;
  color: var(--fog);
  font-size: 0.9rem;
  max-width: 28ch;
}

.footer-logo {
  display: block;
  width: 7.5rem;
  height: auto;
}

.footer-meta {
  text-align: right;
  color: var(--fog);
  font-size: 0.85rem;
}

.footer-meta p + p {
  margin-top: 0.25rem;
}

/* Animations */
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes stamp-in {
  from {
    opacity: 0;
    transform: rotate(-8deg) scale(1.3);
  }
  to {
    opacity: 0.9;
    transform: rotate(-8deg) scale(1);
  }
}

@keyframes hero-drift {
  from {
    transform: scale(1.06) translate(0, 0);
  }
  to {
    transform: scale(1.12) translate(-1.5%, 1%);
  }
}

@keyframes marquee {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

/* Responsive */
@media (max-width: 960px) {
  .steps {
    grid-template-columns: 1fr 1fr;
  }

  .case-row,
  .case-row.reverse {
    grid-template-columns: 1fr;
  }

  .case-row.reverse .case-visual,
  .case-row.reverse .case-body {
    order: unset;
    text-align: left;
    margin-left: 0;
  }

  .case-row.reverse .case-body p {
    margin-left: 0;
  }

  .kit-grid {
    grid-template-columns: 1fr;
  }

  .quotes {
    grid-template-columns: 1fr;
  }

  .audience-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .nav {
    position: fixed;
    inset: 0 0 auto 0;
    top: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
    padding: 5rem var(--pad) 2rem;
    background: rgba(18, 21, 28, 0.98);
    border-bottom: 1px solid var(--line);
    transform: translateY(-110%);
    transition: transform 0.4s var(--ease);
  }

  .nav.is-open {
    transform: none;
  }

  .menu-toggle {
    display: flex;
    z-index: 60;
  }

  body.menu-open {
    overflow: hidden;
  }

  .steps {
    grid-template-columns: 1fr;
  }

  .evidence-list {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-meta {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .hero-parallax {
    transform: none !important;
  }

  .hero-parallax-bg {
    inset: 0;
  }

  .hero-content,
  .hero-stamp {
    transform: none !important;
  }
}