/* ========================================
   Design System — INTEGR KR
   Inspired by trafficsoft.ru aesthetic
   ======================================== */

:root {
  --color-accent: #14f3e7;
  --color-accent-hover: #0adcd0;
  --color-accent-glow: rgba(20, 243, 231, 0.15);
  --color-text: #1a1a1a;
  --color-text-muted: #6b7280;
  --color-bg: #ffffff;
  --color-bg-gray: #f8f9fc;
  --color-dark: #0f1724;
  --color-dark-card: #182236;
  --color-border: #e5e7eb;
  --color-card-shadow: rgba(0, 0, 0, 0.06);

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --container-max: 75rem;
  --container-padding: 1.25rem;
  --header-height: 4.25rem;
  --radius-card: 1rem;
  --radius-btn: 999px;
  --transition: 0.2s ease;
}

/* ── Reset ─────────────────────────────── */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* ── Container ─────────────────────────── */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ── Section ───────────────────────────── */

.section {
  padding: 5rem 0;
  position: relative;
}

.section--dark {
  background-color: var(--color-dark);
  overflow: hidden;
}

.section__header {
  text-align: center;
  margin-bottom: 3rem;
}

.section__tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-hover);
  margin-bottom: 0.75rem;
}

.section__tag--light {
  color: var(--color-accent);
}

.section__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.section__title--light {
  color: #ffffff;
}

.section__desc {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  max-width: 36rem;
  margin: 0 auto;
}

.section__desc--light {
  color: rgba(255, 255, 255, 0.6);
}

/* ── Button ────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  border: 1px solid transparent;
  border-radius: var(--radius-btn);
  font-family: var(--font-family);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-text);
  border-color: var(--color-accent);
}

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

.btn--outline {
  background-color: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.btn--outline:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

/* ── Header ────────────────────────────── */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.header--scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.08);
  border-bottom-color: transparent;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

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

.header__nav {
  display: flex;
  gap: 2rem;
}

.header__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding-bottom: 0.25rem;
  transition: color var(--transition);
}

.header__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 1px;
  transition: width 0.3s ease, left 0.3s ease;
}

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

.header__link:hover::after {
  width: 100%;
  left: 0;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.header__cta {
  padding: 0.5rem 1.5rem;
  font-size: 0.875rem;
}

/* Burger */

.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.header__burger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.header__burger--active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.header__burger--active span:nth-child(2) {
  opacity: 0;
}

.header__burger--active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Language Switcher ─────────────────── */

.lang-switcher {
  position: relative;
}

.lang-switcher__btn {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.625rem;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  cursor: pointer;
  font-family: var(--font-family);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: border-color var(--transition), color var(--transition);
}

.lang-switcher__btn:hover {
  border-color: var(--color-text);
  color: var(--color-text);
}

.lang-switcher__icon {
  flex-shrink: 0;
}

.lang-switcher__label {
  line-height: 1;
}

.lang-switcher__dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition);
  z-index: 200;
  min-width: 8rem;
}

.lang-switcher__dropdown--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-switcher__option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.625rem 1rem;
  background: none;
  border: none;
  font-family: var(--font-family);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
  text-align: left;
}

.lang-switcher__option:hover {
  background-color: var(--color-bg-gray);
  color: var(--color-text);
}

.lang-switcher__option--active {
  color: var(--color-text);
  font-weight: 500;
}

/* ── Hero ──────────────────────────────── */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding-top: var(--header-height);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Subtle dot grid */
.hero__grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, #d1d5db 1px, transparent 1px);
  background-size: 2rem 2rem;
  opacity: 0.4;
}

/* Gradient blobs */
.hero__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}

.hero__blob--1 {
  width: 35rem;
  height: 35rem;
  top: -10rem;
  right: -10rem;
  background: radial-gradient(circle, var(--color-accent-glow), transparent 70%);
}

.hero__blob--2 {
  width: 25rem;
  height: 25rem;
  bottom: -5rem;
  left: -8rem;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.08), transparent 70%);
}

/* Floating geometric shapes */
.hero__shape {
  position: absolute;
  border-radius: 50%;
  border: 1.5px solid rgba(20, 243, 231, 0.2);
  animation: float 20s ease-in-out infinite;
}

.hero__shape--1 {
  width: 18rem;
  height: 18rem;
  top: 15%;
  right: 8%;
  animation-delay: 0s;
}

.hero__shape--2 {
  width: 10rem;
  height: 10rem;
  bottom: 20%;
  right: 15%;
  border-color: rgba(99, 102, 241, 0.15);
  animation-delay: -7s;
  animation-duration: 15s;
}

.hero__shape--3 {
  width: 6rem;
  height: 6rem;
  top: 30%;
  left: 10%;
  border-color: rgba(20, 243, 231, 0.12);
  animation-delay: -3s;
  animation-duration: 12s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(10px, -15px) rotate(2deg); }
  50% { transform: translate(-5px, 10px) rotate(-1deg); }
  75% { transform: translate(8px, 5px) rotate(1deg); }
}

.hero__inner {
  text-align: center;
  padding: 4rem 0;
  position: relative;
  z-index: 1;
}

.hero__badge {
  display: inline-block;
  padding: 0.375rem 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent-hover);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-btn);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 36rem;
  margin: 0 auto 2.5rem;
  line-height: 1.7;
}

.hero__buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

.hero__cta {
  padding: 0.875rem 2.5rem;
  font-size: 1rem;
}

.hero__cta-secondary {
  padding: 0.875rem 2.5rem;
  font-size: 1rem;
}

/* Stats */
.hero__stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  padding: 2rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  max-width: 40rem;
  margin: 0 auto;
}

.hero__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.hero__stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text);
}

.hero__stat-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.hero__stat-divider {
  width: 1px;
  height: 2.5rem;
  background-color: var(--color-border);
}

/* ── About ─────────────────────────────── */

.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

.about__content p {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

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

.about__highlights {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.highlight {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  border-radius: 0.75rem;
  border: 1px solid var(--color-border);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.highlight:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px var(--color-accent-glow);
}

.highlight__icon {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  color: var(--color-accent-hover);
}

.highlight__icon svg {
  width: 100%;
  height: 100%;
}

.highlight__title {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.highlight__text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ── Solutions ─────────────────────────── */

.solutions__decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.solutions__circle {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(20, 243, 231, 0.08);
}

.solutions__circle--1 {
  width: 40rem;
  height: 40rem;
  top: -20rem;
  right: -15rem;
}

.solutions__circle--2 {
  width: 30rem;
  height: 30rem;
  bottom: -15rem;
  left: -10rem;
}

.solutions__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

/* ── Card ──────────────────────────────── */

.card {
  background-color: var(--color-dark-card);
  border-radius: var(--radius-card);
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: transform var(--transition), border-color var(--transition);
  position: relative;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(20, 243, 231, 0.25);
}

.card__number {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.card__icon {
  width: 3rem;
  height: 3rem;
  color: var(--color-accent);
  margin-bottom: 1.25rem;
}

.card__icon svg {
  width: 100%;
  height: 100%;
}

.card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: #ffffff;
}

.card__text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 1.25rem;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card__tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-btn);
  background-color: rgba(20, 243, 231, 0.1);
  color: var(--color-accent);
}

/* ── Partners ──────────────────────────── */

.partners__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.partners__item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 12rem;
  min-height: 7rem;
  padding: 2rem 3rem;
  background-color: var(--color-bg);
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.partners__item img {
  max-height: 5rem;
  max-width: 12rem;
  width: auto;
  object-fit: contain;
}

.partners__item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px var(--color-accent-glow);
}

/* ── Contact ───────────────────────────── */

.contact__decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.contact__glow {
  position: absolute;
  width: 30rem;
  height: 30rem;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(20, 243, 231, 0.07), transparent 60%);
  border-radius: 50%;
}

.contact__inner {
  text-align: center;
  position: relative;
  z-index: 1;
}

.contact__cards {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 2rem 3rem;
  background-color: var(--color-dark-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  transition: border-color var(--transition), transform var(--transition);
  min-width: 14rem;
}

.contact__card:hover {
  border-color: rgba(20, 243, 231, 0.25);
  transform: translateY(-2px);
}

.contact__card-icon {
  color: var(--color-accent);
}

.contact__card-label {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

.contact__card-value {
  font-size: 1rem;
  color: #ffffff;
  font-weight: 500;
}

/* ── Footer ────────────────────────────── */

.footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
}

.footer__logo {
  font-size: 1.125rem;
  font-weight: 700;
}

.footer__legal {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.footer__nav {
  display: flex;
  gap: 1.5rem;
}

.footer__link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  position: relative;
  padding-bottom: 0.125rem;
  transition: color var(--transition);
}

.footer__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: width 0.3s ease, left 0.3s ease;
}

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

.footer__link:hover::after {
  width: 100%;
  left: 0;
}

/* ── Animations ────────────────────────── */

.fade-in {
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Mobile nav overlay ────────────────── */

.nav-overlay {
  display: none;
}

/* ── Responsive ────────────────────────── */

/* Tablet (640px+) */
@media (min-width: 40rem) {
  :root {
    --container-padding: 2rem;
  }

  .section {
    padding: 6rem 0;
  }

  .section__title {
    font-size: 2.25rem;
  }

  .hero__title {
    font-size: 3.5rem;
  }

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

  .about__grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer__brand {
    align-items: flex-start;
  }
}

/* Desktop (960px+) */
@media (min-width: 60rem) {
  .section {
    padding: 7rem 0;
  }

  .section__title {
    font-size: 2.5rem;
  }

  .hero__title {
    font-size: 4rem;
  }

  .hero__subtitle {
    font-size: 1.25rem;
  }

  .solutions__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Mobile nav (<960px) */
@media (max-width: 59.9375rem) {
  .header__nav {
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100vh;
    height: 100svh;
    background-color: var(--color-bg);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 99;
  }

  .header__nav--open {
    transform: translateX(0);
  }

  .header__nav .header__link {
    font-size: 1.25rem;
  }

  .header__actions .header__cta {
    display: none;
  }

  .header__burger {
    display: flex;
    z-index: 101;
  }

  .nav-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.3);
    z-index: 98;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }

  .nav-overlay--visible {
    display: block;
    opacity: 1;
    pointer-events: auto;
  }
}

/* Small mobile */
@media (max-width: 25rem) {
  .hero__title {
    font-size: 2rem;
  }

  .hero__stats {
    gap: 1.25rem;
    padding: 1.5rem 1rem;
  }

  .hero__stat-divider {
    display: none;
  }

  .hero__stats {
    flex-direction: column;
  }

  .contact__cards {
    flex-direction: column;
    align-items: center;
  }

  .contact__card {
    width: 100%;
  }
}