/* ============================================
   RESET
   ============================================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

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

ul, ol {
  list-style: none;
}

/* ============================================
   CUSTOM PROPERTIES
   ============================================ */
:root {
  --color-bg-primary:    #FFFFFF;
  --color-bg-secondary:  #F5F5F5;
  --color-bg-accent:     #EAEAEA;
  --color-bg-dark:       #1A1A1A;
  --color-bg-dark-light: #2A2A2A;

  --color-text-primary:  #111111;
  --color-text-secondary:#555555;
  --color-text-muted:    #888888;
  --color-text-on-dark:  #FFFFFF;

  --color-accent-ruby:   #CC342D;
  --color-accent-ember:  #E8590C;
  --color-accent-gold:   #666666;

  --color-border:        #E0E0E0;

  --font-heading:  'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body:     'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:     'IBM Plex Mono', 'Courier New', monospace;

  --fs-hero:     clamp(3.5rem, 9vw, 7.5rem);
  --fs-h1:       clamp(2.25rem, 5vw, 4rem);
  --fs-h2:       clamp(1.75rem, 4vw, 3rem);
  --fs-h3:       clamp(1.25rem, 2.5vw, 1.75rem);
  --fs-body:     clamp(1rem, 1.1vw, 1.125rem);
  --fs-small:    0.875rem;

  --lh-heading:  1.1;
  --lh-body:     1.7;

  --space-xs:    0.5rem;
  --space-sm:    1rem;
  --space-md:    2rem;
  --space-lg:    4rem;
  --space-xl:    6rem;
  --space-2xl:   10rem;

  --max-width:   1200px;
  --gutter:      clamp(1.5rem, 4vw, 3rem);

  --transition-fast:  150ms ease;
  --transition-base:  300ms ease;
  --transition-slow:  500ms cubic-bezier(0.23, 1, 0.32, 1);
}

/* ============================================
   BASE
   ============================================ */
body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

::selection {
  background-color: var(--color-accent-ruby);
  color: #fff;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: var(--lh-heading);
  font-weight: 700;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

/* Animated underline links */
.link-underline {
  background-image: linear-gradient(var(--color-accent-ruby), var(--color-accent-ruby));
  background-size: 0% 1.5px;
  background-position: left bottom;
  background-repeat: no-repeat;
  transition: background-size var(--transition-slow);
  padding-bottom: 3px;
}

.link-underline:hover {
  background-size: 100% 1.5px;
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: var(--space-xl) 0;
}

.section--alt {
  background-color: var(--color-bg-secondary);
}

.section--dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.nav__logo span {
  color: var(--color-accent-ruby);
}

.nav__links {
  display: flex;
  gap: var(--space-md);
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover {
  color: var(--color-text-primary);
}

.nav__link--active {
  color: var(--color-text-primary);
}

.nav__link--active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-accent-ruby);
}

/* Menu toggle checkbox (hidden) */
.menu-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

/* Mobile menu button */
.nav__burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 20px;
  position: relative;
}

.nav__burger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-text-primary);
  position: absolute;
  left: 0;
  transition: all var(--transition-fast);
}

.nav__burger span:nth-child(1) { top: 0; }
.nav__burger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav__burger span:nth-child(3) { bottom: 0; }

/* Burger animation when checked */
#menu-toggle:checked ~ .nav .nav__burger span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

#menu-toggle:checked ~ .nav .nav__burger span:nth-child(2) {
  opacity: 0;
}

#menu-toggle:checked ~ .nav .nav__burger span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* Mobile overlay */
.nav__overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg-primary);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

#menu-toggle:checked ~ .nav__overlay {
  display: flex;
}

/* Close button area (full overlay click to close) */
.nav__overlay-close {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
  z-index: -1;
}

.nav__overlay .nav__link {
  font-size: var(--fs-h3);
  letter-spacing: 0.05em;
  position: relative;
  z-index: 1;
}

/* Prevent scroll when menu is open */
body:has(#menu-toggle:checked) {
  overflow: hidden;
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-2xl) 0 var(--space-xl);
  position: relative;
  overflow: hidden;
}

.hero__label {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.hero__heading {
  font-size: var(--fs-hero);
  font-weight: 900;
  line-height: 0.92;
  letter-spacing: -0.04em;
  max-width: 900px;
}

.hero__heading .accent {
  color: var(--color-accent-ruby);
  display: inline-block;
}

.hero__divider {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-ruby), var(--color-accent-gold));
  margin: var(--space-lg) 0;
}

.hero__tagline {
  font-size: clamp(1.1rem, 1.5vw, 1.3rem);
  font-weight: 400;
  color: var(--color-text-secondary);
  max-width: 560px;
  line-height: 1.65;
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 500;
  padding: 0.85em 2em;
  transition: all var(--transition-base);
  background-color: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.hero__cta:hover {
  background-color: var(--color-accent-ruby);
}

.hero__cta--outline {
  background-color: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-border);
}

.hero__cta--outline:hover {
  border-color: var(--color-text-primary);
  background-color: transparent;
}

/* Scroll indicator */
.hero__scroll {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.hero__scroll-arrow {
  width: 16px;
  height: 16px;
  border-right: 1.5px solid var(--color-text-muted);
  border-bottom: 1.5px solid var(--color-text-muted);
  transform: rotate(45deg);
  animation: bounce 2.5s ease infinite;
  opacity: 0.5;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: rotate(45deg) translateY(0); }
  40% { transform: rotate(45deg) translateY(6px); }
  60% { transform: rotate(45deg) translateY(3px); }
}

/* ============================================
   SECTION: ДЛЯ КОГО
   ============================================ */
.audience {
  position: relative;
}

.audience__title {
  margin-bottom: var(--space-lg);
}

.audience__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.audience__card {
  padding: var(--space-md) var(--space-md) var(--space-md) calc(var(--space-md) + 3px);
  border-left: 2px solid var(--color-border);
  transition: border-color var(--transition-slow), background-color var(--transition-slow);
}

.audience__card:hover {
  border-left-color: var(--color-accent-ruby);
  background-color: rgba(234, 234, 234, 0.5);
}

.audience__card:nth-child(even) {
  margin-top: var(--space-md);
}

.audience__card:last-child {
  grid-column: 1 / -1;
  max-width: 50%;
}

.audience__text {
  color: var(--color-text-secondary);
  font-size: var(--fs-body);
  line-height: 1.6;
}

/* ============================================
   SECTION: УСЛУГИ (index)
   ============================================ */
.services-preview {
  position: relative;
}

.services-preview__layout {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-lg);
}

.services-preview__rotated-title {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--font-heading);
  font-size: var(--fs-h1);
  font-weight: 900;
  color: var(--color-accent-ruby);
  opacity: 0.08;
  white-space: nowrap;
  align-self: start;
  position: sticky;
  top: 100px;
}

.services-preview__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.services-preview__card {
  padding: var(--space-md);
  position: relative;
  transition: all var(--transition-slow);
}

.services-preview__card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1.5px;
  background-color: var(--color-border);
  transition: background-color var(--transition-slow);
}

.services-preview__card:hover::before {
  background: linear-gradient(90deg, var(--color-accent-ruby), transparent);
}

.services-preview__glyph {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-accent-ruby);
  opacity: 0.4;
  margin-bottom: var(--space-sm);
  display: block;
}

.services-preview__card-title {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.services-preview__card-text {
  color: var(--color-text-secondary);
  font-size: var(--fs-small);
  line-height: 1.65;
}

.services-preview__more {
  margin-top: var(--space-lg);
  text-align: right;
}

.services-preview__more a {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-accent-ruby);
  font-size: var(--fs-small);
}

/* ============================================
   SECTION: ТЕХНОЛОГИИ
   ============================================ */
.tech {
  background-image: radial-gradient(circle, rgba(200, 200, 200, 0.4) 1px, transparent 1px);
  background-size: 28px 28px;
}

.tech__title {
  margin-bottom: var(--space-lg);
}

.tech__grid {
  display: flex;
  justify-content: center;
  gap: clamp(2rem, 5vw, 4rem);
  flex-wrap: wrap;
}

.tech__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  transition: transform var(--transition-slow);
}

.tech__item:hover {
  transform: translateY(-4px);
}

.tech__item:hover .tech__icon {
  opacity: 1;
}

.tech__icon {
  width: 80px;
  height: 80px;
  object-fit: contain;
  opacity: 0.8;
  transition: opacity var(--transition-slow);
}

.tech__name {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: center;
  transition: color var(--transition-fast);
}

.tech__item:hover .tech__name {
  color: var(--color-text-primary);
}

/* ============================================
   SECTION: МЕТОДОЛОГИИ
   ============================================ */
.methods__title {
  margin-bottom: var(--space-lg);
  color: var(--color-text-on-dark);
}

.methods__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.methods__grid--row2 {
  grid-template-columns: repeat(3, 1fr);
  margin-top: var(--space-sm);
}

.methods__card {
  background-color: var(--color-bg-dark-light);
  padding: var(--space-md);
  border-radius: 2px;
  transition: background-color var(--transition-slow);
  border-bottom: 2px solid transparent;
}

.methods__card:hover {
  background-color: #333333;
  border-bottom-color: var(--color-accent-gold);
}

.methods__abbr {
  font-family: var(--font-mono);
  font-size: var(--fs-h2);
  font-weight: 500;
  color: var(--color-accent-gold);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.02em;
}

.methods__name {
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-text-on-dark);
  margin-bottom: var(--space-sm);
  opacity: 0.65;
}

.methods__desc {
  color: var(--color-text-on-dark);
  opacity: 0.55;
  font-size: var(--fs-small);
  line-height: 1.6;
}

/* ============================================
   SERVICES PAGE
   ============================================ */
.page-hero {
  padding: var(--space-2xl) 0 var(--space-lg);
}

.page-hero__breadcrumb {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.page-hero__breadcrumb a {
  color: var(--color-accent-ruby);
}

.page-hero__heading {
  font-size: var(--fs-h1);
  font-weight: 900;
}

/* Service section */
.service-detail {
  position: relative;
}

.service-detail__grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  align-items: start;
}

.service-detail--reverse .service-detail__grid {
  grid-template-columns: 2fr 3fr;
}

.service-detail--reverse .service-detail__content {
  order: 2;
}

.service-detail--reverse .service-detail__panel {
  order: 1;
}

.service-detail__title {
  font-size: var(--fs-h2);
  margin-bottom: var(--space-md);
}

.service-detail__text {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

.service-detail__panel {
  background-color: var(--color-bg-accent);
  padding: var(--space-md);
  border-left: 2px solid var(--color-accent-ruby);
}

.service-detail--ember .service-detail__panel {
  border-left-color: var(--color-accent-ember);
}

.service-detail--gold .service-detail__panel {
  border-left-color: var(--color-accent-gold);
}

.service-detail--ruby .service-detail__panel {
  border-left-color: var(--color-accent-ruby);
}

.service-detail__panel-title {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
}

.service-detail__panel-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.service-detail__panel-list li {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  padding-left: 1.4em;
  position: relative;
  line-height: 1.5;
}

.service-detail__panel-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-text-muted);
}

/* ============================================
   CONTACTS PAGE
   ============================================ */
.contacts-layout {
  min-height: 80vh;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.contacts__rotated {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  color: var(--color-text-primary);
  opacity: 0.06;
  white-space: nowrap;
}

.contacts__list {
  display: flex;
  flex-direction: column;
  gap: clamp(2rem, 4vw, 3.5rem);
}

.contacts__item {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
}

.contacts__protocol {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--color-text-muted);
  min-width: 110px;
  text-align: right;
  opacity: 0.6;
}

.contacts__value {
  font-family: var(--font-body);
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
}

.contacts__value:hover {
  color: var(--color-accent-ruby);
}

/* CTA section */
.cta {
  text-align: center;
  padding: var(--space-xl) 0;
}

.cta__heading {
  font-family: var(--font-heading);
  font-size: var(--fs-h2);
  color: var(--color-text-on-dark);
  margin-bottom: var(--space-md);
}

.cta__button {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-text-on-dark);
  border: 1.5px solid rgba(255, 255, 255, 0.2);
  padding: 0.9em 2.2em;
  transition: all var(--transition-base);
}

.cta__button:hover {
  background-color: var(--color-accent-ruby);
  border-color: var(--color-accent-ruby);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  padding: var(--space-xl) 0 var(--space-md);
  border-top: 2px solid var(--color-accent-ruby);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer__tagline {
  font-family: var(--font-heading);
  font-size: var(--fs-h3);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
}

.footer__subtitle {
  color: var(--color-text-on-dark);
  opacity: 0.45;
  font-size: var(--fs-small);
  line-height: 1.6;
}

.footer__heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-sm);
  opacity: 0.35;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer__link {
  font-size: var(--fs-small);
  color: var(--color-text-on-dark);
  opacity: 0.65;
  transition: opacity var(--transition-fast);
}

.footer__link:hover {
  opacity: 1;
}

.footer__contact-link {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--color-text-on-dark);
  opacity: 0.65;
  transition: opacity var(--transition-fast);
}

.footer__contact-link:hover {
  opacity: 1;
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer__copy {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  opacity: 0.3;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .methods__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .methods__grid--row2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .service-detail__grid,
  .service-detail--reverse .service-detail__grid {
    grid-template-columns: 1fr;
  }

  .service-detail--reverse .service-detail__content,
  .service-detail--reverse .service-detail__panel {
    order: unset;
  }

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

  .contacts-layout {
    grid-template-columns: 1fr;
  }

  .contacts__rotated {
    writing-mode: horizontal-tb;
    transform: none;
    font-size: var(--fs-h1);
    opacity: 0.08;
  }
}

@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__burger {
    display: block;
  }

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

  .audience__card:nth-child(even) {
    margin-top: 0;
  }

  .audience__card:last-child {
    max-width: 100%;
  }

  .services-preview__layout {
    grid-template-columns: 1fr;
  }

  .services-preview__rotated-title {
    writing-mode: horizontal-tb;
    transform: none;
    position: static;
    opacity: 0.08;
    margin-bottom: var(--space-md);
  }

  .services-preview__grid {
    grid-template-columns: 1fr;
  }

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

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .contacts__item {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .contacts__protocol {
    text-align: left;
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .hero {
    min-height: auto;
    padding: var(--space-xl) 0;
  }

  .hero__actions {
    flex-direction: column;
    max-width: 200px;
  }

  .hero__cta {
    text-align: center;
    justify-content: center;
  }
}

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

  html {
    scroll-behavior: auto;
  }
}