/* --- CSS VARIABLES & RESET --- */
:root {
  /* Palette: Industrial / Technical */
  --color-bg-main: #f8f9fa; /* Светло-серый фон */
  --color-bg-alt: #e9ecef; /* Альтернативный фон секций */
  --color-text-primary: #212529; /* Тёмно-графитовый */
  --color-text-secondary: #495057; /* Серый текст */
  --color-accent-blue: #2c5282; /* Индустриальный синий */
  --color-accent-orange: #dd6b20; /* Технический оранжевый (акцент) */
  --color-border: #dee2e6;
  --color-white: #ffffff;

  --font-main: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;

  --grid-gutter: 2rem;
  --section-spacing: 6rem;
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --shadow-tech: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: --font-main;
  background-color: var(--color-bg-main);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  font-size: 3.5rem;
}
h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}
h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

p {
  margin-bottom: 1rem;
}
.lead {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-smooth);
}
ul {
  list-style: none;
}
img.responsive-img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius-sm);
}

/* Utility Classes */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.grid-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gutter);
  align-items: center;
}

.grid-split--rev {
  direction: rtl;
}
.grid-split--rev > * {
  direction: ltr;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gutter);
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.text-center {
  text-align: center;
}
.accent-text {
  color: var(--color-accent-orange);
}
.req {
  color: var(--color-accent-orange);
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-smooth);
  gap: 0.5rem;
}

.button--primary {
  background-color: var(--color-accent-blue);
  color: var(--color-white);
}

.button--primary:hover {
  background-color: #1a365d;
  box-shadow: var(--shadow-tech);
}

.button--nav {
  background-color: transparent;
  border-color: var(--color-text-primary);
  padding: 0.5rem 1rem;
}
.button--nav:hover {
  background-color: var(--color-text-primary);
  color: var(--color-white);
}
.button--sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}
.button--full {
  width: 100%;
}

/* --- HEADER & NAV --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: rgba(248, 249, 250, 0.95); /* Semi-transparent bg */
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-accent-orange);
  padding: 5px;
  border-radius: 10px;
  transition: all 0.3s ease;
}

.logo:hover {
  opacity: 0.8;
  transform: scale(1.05);
  transition: all 0.3s ease;
}

.logo img {
  width: 50px;
  height: 50px;
}

.desk-nav {
  display: block;
}
.nav__list {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav__link {
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}
.nav__link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-orange);
  transition: var(--transition-smooth);
}
.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.burger-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-primary);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-bg-main);
  z-index: 200;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transform: translateY(-100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.mobile-menu.active {
  transform: translateY(0);
}
body.no-scroll {
  overflow: hidden;
}

.close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-primary);
}

.mobile-nav__list {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.mobile-nav__link {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent-blue);
}

/* --- SECTIONS --- */
.section {
  padding: var(--section-spacing) 0;
}
.section--alt {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.section-header {
  margin-bottom: 3rem;
}
.section-title {
  position: relative;
  display: inline-block;
}
.section-subtitle {
  color: var(--color-text-secondary);
  margin-top: 0.5rem;
  font-weight: 500;
}
.section-icon {
  color: var(--color-accent-orange);
  margin-bottom: 1rem;
  width: 32px;
  height: 32px;
}

/* Image Containers & Visuals */
.image-container {
  position: relative;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  padding: 1rem;
}

.viz-tech-overlay {
  position: relative;
}
.tech-line-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: linear-gradient(
    45deg,
    var(--color-border) 25%,
    transparent 25%,
    transparent 50%,
    var(--color-border) 50%,
    var(--color-border) 75%,
    transparent 75%,
    transparent
  );
  background-size: 20px 20px;
  opacity: 0.1;
  pointer-events: none;
}

.viz-blueprint {
  background-color: #e0e5ec; /* Blueprint-ish background */
  box-shadow: inset 0 0 20px rgba(44, 82, 130, 0.1);
}

.viz-security .overlay-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 64px;
  height: 64px;
  color: var(--color-accent-blue);
  opacity: 0.8;
}

/* --- HERO --- */
.hero {
  padding-top: calc(80px + 4rem); /* Header height + spacing */
  padding-bottom: 4rem;
}

/* --- SECTION 1: Concept --- */
.tech-list {
  margin: 2rem 0;
}
.tech-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-weight: 500;
}
.tech-list i {
  color: var(--color-accent-blue);
  width: 20px;
  height: 20px;
}
.tech-marker {
  display: inline-block;
  background-color: var(--color-accent-blue);
  color: var(--color-white);
  padding: 0.5rem 1rem;
  font-weight: 600;
  border-radius: var(--border-radius-sm);
  font-size: 0.9rem;
}

/* --- SECTION 2: Benefits Grid --- */
.benefit-card {
  background: var(--color-white);
  padding: 2rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}
.benefit-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-tech);
  border-color: var(--color-accent-blue);
}
.benefit-icon {
  color: var(--color-accent-orange);
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
}
.benefit-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--color-accent-blue);
  opacity: 0;
  transition: var(--transition-smooth);
}
.benefit-card:hover::before {
  opacity: 1;
}

/* --- SECTION 3: Process Diagram --- */
.process-diagram {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 3rem;
}
.process-step {
  flex: 1;
  text-align: center;
  padding: 1rem;
}
.step-icon {
  width: 64px;
  height: 64px;
  background-color: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  color: var(--color-accent-blue);
  transition: var(--transition-smooth);
}
.step-icon--active {
  background-color: var(--color-accent-blue);
  color: var(--color-white);
  border-color: var(--color-accent-blue);
}
.process-connector {
  flex-basis: 50px;
  display: flex;
  justify-content: center;
  padding-top: 20px;
  color: var(--color-border);
}
.viz-flow {
  border: 2px dashed var(--color-accent-blue);
  padding: 5px;
}

/* --- SECTION 4: Solutions Cards --- */
.solution-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: var(--transition-smooth);
}
.solution-card:hover {
  box-shadow: var(--shadow-tech);
}
.solution-img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid var(--color-border);
}
.solution-content {
  padding: 1.5rem;
  position: relative;
}
.solution-icon {
  position: absolute;
  top: -2px;
  right: 20px;
  background: var(--color-accent-orange);
  color: var(--color-white);
  padding: 8px;
  border-radius: var(--border-radius-sm);
  width: 36px;
  height: 36px;
}

/* --- SECTION 5: Architecture --- */
.architecture-block {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--grid-gutter);
  align-items: center;
  background: var(--color-white);
  padding: 3rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
}
.tech-specs {
  margin-top: 2rem;
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.tech-specs div {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--color-accent-blue);
  font-size: 0.9rem;
}
.viz-schematic {
  border: 2px solid var(--color-text-primary);
  background-color: var(--color-bg-main);
  padding: 2rem;
}

/* --- SECTION 6: Timeline --- */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  background-color: var(--color-border);
  transform: translateX(-50%);
}
.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding-bottom: 3rem;
  position: relative;
  width: 50%;
  padding-right: 40px;
  box-sizing: border-box;
}
.timeline-item--rev {
  align-self: flex-end;
  justify-content: flex-start;
  margin-left: 50%;
  padding-right: 0;
  padding-left: 40px;
}
.timeline-marker {
  position: absolute;
  top: 0;
  right: -60px;
  background-color: var(--color-accent-blue);
  color: var(--color-white);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  z-index: 2;
}
.timeline-item--rev .timeline-marker {
  right: auto;
  left: -60px;
}
.timeline-content {
  background: var(--color-white);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  position: relative;
}
.timeline-content::after {
  content: "";
  position: absolute;
  top: 15px;
  right: -10px;
  width: 20px;
  height: 20px;
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  transform: rotate(45deg);
}
.timeline-item--rev .timeline-content::after {
  right: auto;
  left: -10px;
  border-right: none;
  border-left: 1px solid var(--color-border);
  transform: rotate(-45deg);
}
.accent-border {
  border-left: 4px solid var(--color-accent-orange);
}
.timeline-img {
  margin-top: 1rem;
}
.timeline-img img {
  max-height: 150px;
  width: auto;
}

/* --- SECTION 7: Deep Dive --- */
.deep-dive-block {
  margin-top: 2rem;
  display: flex;
  gap: 2rem;
}
.dd-item {
  flex: 1;
  background: var(--color-bg-alt);
  padding: 1.5rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--color-border);
}
.dd-marker {
  display: block;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-accent-orange);
  margin-bottom: 0.5rem;
}

/* --- FAQ --- */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}
.faq-item {
  margin-bottom: 1rem;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  border-radius: var(--border-radius-sm);
}
.faq-question {
  width: 100%;
  text-align: left;
  padding: 1.5rem;
  background: none;
  border: none;
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  color: var(--color-text-primary);
  font-family: inherit;
}
.faq-question i {
  transition: transform 0.3s;
  color: var(--color-accent-blue);
}
.faq-question.active i {
  transform: rotate(180deg);
}
.faq-answer {
  padding: 0 1.5rem;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  background-color: var(--color-bg-main);
}
.faq-answer.active {
  padding-bottom: 1.5rem;
  max-height: 500px;
}

/* --- CONTACT FORM --- */
.contact-info {
  padding-right: 2rem;
}
.contact-list {
  margin: 2rem 0;
}
.contact-list li {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  font-weight: 500;
}
.contact-list i {
  color: var(--color-accent-orange);
}
.viz-contact {
  border: 2px solid var(--color-accent-orange);
  padding: 5px;
}

.tech-form {
  background: var(--color-white);
  padding: 2rem;
  border: 2px solid var(--color-text-primary);
  border-radius: var(--border-radius-sm);
}
.form-group {
  margin-bottom: 1.5rem;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.form-input {
  width: 100%;
  padding: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: 0; /* Strict edges */
  font-family: inherit;
  background-color: var(--color-bg-main);
  transition: var(--transition-smooth);
}
.form-input:focus {
  outline: none;
  border-color: var(--color-accent-blue);
  background-color: var(--color-white);
  box-shadow: inset 0 0 0 2px rgba(44, 82, 130, 0.1);
}
.tech-input--short {
  width: 100px;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}
.tech-checkbox {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-text-primary);
  border-radius: 0;
  flex-shrink: 0;
  position: relative;
  cursor: pointer;
}
.tech-checkbox:checked {
  background-color: var(--color-accent-blue);
  border-color: var(--color-accent-blue);
}
.tech-checkbox:checked::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 6px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.checkbox-label {
  font-size: 0.85rem;
  line-height: 1.4;
  cursor: pointer;
}

.checkbox-label a {
  color: var(--color-accent-orange);
}
.checkbox-label a:hover {
  text-decoration: underline;
}

/* --- FOOTER --- */
.footer {
  background-color: var(--color-text-primary);
  color: #adb5bd;
  padding-top: 5rem;
}
.footer__container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  padding-bottom: 3rem;
}
.logo--footer {
  color: var(--color-white);
}
.footer__desc {
  margin-top: 1rem;
  font-size: 0.9rem;
}
.footer h4 {
  color: var(--color-white);
  margin-bottom: 1.5rem;
  text-transform: uppercase;
  font-size: 1rem;
  letter-spacing: 0.05em;
}
.footer__links li {
  margin-bottom: 0.75rem;
}
.footer__links a:hover {
  color: var(--color-accent-orange);
}
.footer__contacts p {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}
.footer__contacts i {
  color: var(--color-accent-blue);
}
.footer__bottom {
  border-top: 1px solid #343a40;
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.85rem;
}

/* --- COOKIE POPUP --- */
.cookie-popup {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(150%);
  background: var(--color-text-primary);
  color: var(--color-white);
  padding: 1.5rem;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-tech);
  z-index: 999;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  max-width: 600px;
  width: 90%;
  border: 2px solid var(--color-accent-blue);
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.cookie-popup.active {
  transform: translateX(-50%) translateY(0);
}
.cookie-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.cookie-icon {
  color: var(--color-accent-orange);
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}
.cookie-popup p {
  margin: 0;
  font-size: 0.9rem;
}

/* --- MEDIA QUERIES (RESPONSIVE) --- */
@media (max-width: 1024px) {
  h1 {
    font-size: 2.5rem;
  }
  h2 {
    font-size: 2rem;
  }
  .grid-split,
  .architecture-block,
  .process-diagram {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .grid-split--rev {
    direction: ltr;
  }
  .grid-4,
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
  .desk-nav {
    display: none;
  }
  .burger-btn {
    display: block;
  }
  .hero {
    padding-top: 6rem;
    text-align: center;
  }
  .hero__actions {
    justify-content: center;
  }
  .process-connector {
    transform: rotate(90deg);
    margin: 1rem 0;
    flex-basis: auto;
    padding: 0;
  }
  .process-diagram {
    flex-direction: column;
    align-items: center;
  }
  .timeline::before {
    left: 40px;
  }
  .timeline-item,
  .timeline-item--rev {
    width: 100%;
    margin-left: 0;
    padding-left: 80px;
    padding-right: 0;
    justify-content: flex-start;
  }
  .timeline-marker,
  .timeline-item--rev .timeline-marker {
    left: -20px;
    right: auto;
  }
  .timeline-content::after,
  .timeline-item--rev .timeline-content::after {
    left: -10px;
    border-right: none;
    border-left: 1px solid var(--color-border);
    transform: rotate(-45deg);
  }
  .deep-dive-block {
    flex-direction: column;
  }
  .footer__container {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .grid-4,
  .grid-3,
  .form-row,
  .footer__container {
    grid-template-columns: 1fr;
  }
  :root {
    --section-spacing: 4rem;
  }
  h1 {
    font-size: 2rem;
  }
  .cookie-popup {
    flex-direction: column;
    text-align: center;
    bottom: 1rem;
  }
  .cookie-actions {
    width: 100%;
  }
  .cookie-actions .button {
    width: 100%;
  }
}

.pages {
  padding: 120px 0;
}

.pages-wrap {
  max-width: 1000px;
  padding: 0 20px;
  margin: 0 auto 20px;
}

.pages h1 {
  font-size: 40px;
  font-weight: 900;
  color: var(--accent);
  margin-bottom: 40px;
  text-align: center;
}

.text-wrapper {
  background: #f8fafc;
  padding: 50px 40px;
  border-radius: 20px;
  line-height: 1.8;
}

.text-wrapper h2 {
  font-size: 28px;
  font-weight: 700;
  color: #1e293b;
  margin-top: 40px;
  margin-bottom: 15px;
  border-bottom: 2px solid rgba(99, 102, 241, 0.2);
  padding-bottom: 5px;
}

.text-wrapper h3 {
  color: #000000;
  margin-bottom: 20px;
}

.text-wrapper p {
  color: #64748b;
  margin-bottom: 20px;
}

.text-wrapper ul {
  list-style-type: none;
  padding-left: 0;
  margin-bottom: 20px;
}

.text-wrapper ul li {
  position: relative;
  padding-left: 25px;
  margin-bottom: 15px;
  color: #1e293b;
}

.text-wrapper ul li::before {
  content: "•";
  position: absolute;
  left: 0;
  font-size: 20px;
  line-height: 1;
  color: var(--primary);
  top: 0;
}

.text-wrapper strong {
  color: var(--color-error);
}

.text-wrapper a {
  color: #001eff;
  text-decoration: underline;
  font-weight: 600;
}

@media (max-width: 768px) {
  .pages {
    padding: 100px 0 60px;
  }
  .pages h1 {
    font-size: 28px;
    margin-bottom: 30px;
  }
  .text-wrapper {
    padding: 30px 20px;
  }
  .text-wrapper h2 {
    font-size: 24px;
    margin-top: 30px;
  }
}

.text-wrapper ol {
  display: flex;
  flex-direction: column;
  padding: 20px;
  color: #000000;
}

.margin {
  margin: 120px 0 50px;
}