/* ============================================
   Design System & Variables
   ============================================ */

:root {
  --color-primary: #0A84FF;
  --color-primary-hover: #0070E0;
  --color-accent: #FF9500;
  --color-dark: #1A1A1A;
  --color-text: #333333;
  --color-muted: #6B7280;
  --color-light-bg: #F7F8FA;
  --color-white: #FFFFFF;
  --color-border: #E5E7EB;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --container-max: 1120px;
  --section-padding: 100px;
  --header-height: 72px;

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 50px;

  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-card-hover: 0 2px 8px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.1);

  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}


/* ============================================
   Reset & Base
   ============================================ */

*, *::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: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button {
  font: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

h1, h2, h3, h4 {
  line-height: 1.15;
  color: var(--color-dark);
}


/* ============================================
   Container
   ============================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}


/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-full);
  padding: 12px 28px;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 2px 8px rgba(10, 132, 255, 0.3);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 16px rgba(10, 132, 255, 0.4);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--large {
  padding: 16px 40px;
  font-size: 17px;
}


/* ============================================
   Header
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.header--scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

.header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 32px;
}

.header__logo {
  font-weight: 800;
  font-size: 20px;
  color: var(--color-dark);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.header__link {
  font-weight: 500;
  font-size: 15px;
  color: var(--color-muted);
  transition: color var(--transition);
}

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

.header__cta {
  margin-left: 16px;
  flex-shrink: 0;
}

.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  margin-left: auto;
}

.header__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-dark);
  border-radius: 2px;
  transition: all 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);
}


/* ============================================
   Hero
   ============================================ */

/* Чередование фона секций для удобства чтения */
main > section:nth-child(odd) {
  background: var(--color-white);
}

main > section:nth-child(even) {
  background: var(--color-light-bg);
}

.hero {
  padding: calc(var(--header-height) + 80px) 0 100px;
  min-height: 85vh;
  display: flex;
  align-items: center;
  background: var(--color-white);
}

.hero__inner {
  text-align: center;
}

.hero__title {
  font-size: clamp(36px, 5.5vw, 68px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 48px;
  color: var(--color-dark);
}

.hero__title--accent {
  color: var(--color-primary);
}

/* Platform Visual — Typewriter */
.hero__platforms {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 56px;
}

.hero__typewriter {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-dark);
  min-height: 1.5em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.hero__typewriter-text {
  color: var(--color-dark);
}

.hero__typewriter-cursor {
  color: var(--color-primary);
  animation: typewriter-blink 1s step-end infinite;
}

@keyframes typewriter-blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero__cta {
  display: inline-flex;
}


/* ============================================
   About
   ============================================ */

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

.about .section__title {
  margin-bottom: 48px;
}

.about__inner {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 64px;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
}

.about__photo {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 1;
  box-shadow: var(--shadow-card);
}

.about__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about__content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about__name {
  font-size: clamp(28px, 3vw, 36px);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-dark);
}

.about__role {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

.about__text {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.about__text-item {
  font-size: 17px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.6;
  letter-spacing: 0.01em;
  margin: 0;
}


/* ============================================
   Section Title (shared)
   ============================================ */

.section__title {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 900;
  letter-spacing: -0.03em;
  text-align: center;
  margin-bottom: 56px;
  color: var(--color-dark);
}


/* ============================================
   Process
   ============================================ */

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

.process__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 64px;
}

.process__card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
}

.process__card:hover {
  box-shadow: var(--shadow-card-hover);
}

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

.process__number {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(10, 132, 255, 0.08);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.process__card-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-dark);
}

.process__card-text {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.55;
}

ul.process__card-text {
  margin: 0;
  padding-left: 1.2em;
  list-style: disc;
}

ul.process__card-text li {
  margin-bottom: 4px;
}

ul.process__card-text li:last-child {
  margin-bottom: 0;
}

/* CTA Banner */
.process__cta-banner {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-card);
  border: 2px solid var(--color-border);
}

.process__cta-text {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 24px;
}


/* ============================================
   Pricing & Timeline
   ============================================ */

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

.pricing__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.pricing__card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition);
}

.pricing__card:hover {
  box-shadow: var(--shadow-card-hover);
}

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

.pricing__card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.pricing__value {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
  margin: 0;
}

.pricing__note {
  text-align: center;
  font-size: 17px;
  color: var(--color-muted);
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}

.pricing__link {
  color: var(--color-primary);
  font-weight: 600;
  transition: color var(--transition);
}

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

/* ============================================
   Cases
   ============================================ */

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

.cases__title {
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 900;
  letter-spacing: -0.03em;
  text-align: center;
  margin-bottom: 56px;
  color: var(--color-dark);
}

.cases__title--accent {
  color: var(--color-primary);
}

.cases__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.cases__card {
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  box-shadow: var(--shadow-card);
  overflow: visible;
}

.cases__card--calzen {
  background: #E8F4FC;
}

.cases__card--summarizer {
  background: #F0F0F0;
}

.cases__content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cases__card-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-dark);
  letter-spacing: -0.02em;
}

.cases__card-desc {
  font-size: 18px;
  color: var(--color-text);
  line-height: 1.55;
}

.cases__card-time {
  font-size: 17px;
  color: var(--color-text);
  font-weight: 500;
}

.cases__phones {
  display: flex;
  gap: 16px;
  justify-content: flex-start;
  align-items: flex-end;
  margin-top: auto;
  padding-top: 16px;
}

.cases__phone {
  width: 260px;
  min-width: 260px;
  height: 563px; /* 260 * 19.5/9 */
  flex-shrink: 0;
  border-radius: 28px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  background: #1a1a1a;
}

.cases__phone img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}


/* ============================================
   FAQ
   ============================================ */

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

.faq__list {
  max-width: 760px;
  margin: 0 auto;
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
}

.faq__item:first-child {
  border-top: 1px solid var(--color-border);
}

.faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  text-align: left;
  padding: 24px 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-dark);
  gap: 16px;
  transition: color var(--transition);
}

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

.faq__icon {
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--color-muted);
}

.faq__item.active .faq__icon {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              padding 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq__item.active .faq__answer {
  max-height: 300px;
}

.faq__answer p {
  padding-bottom: 24px;
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.65;
}


/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--color-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 0;
}

.footer__inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer__logo {
  font-weight: 800;
  font-size: 18px;
  color: var(--color-white);
}

.footer__copy {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.45);
}

.footer__heading {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition);
}

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

.footer__link--small {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.45);
}

.footer__link--small:hover {
  color: rgba(255, 255, 255, 0.7);
}

.footer__legal {
  display: flex;
  align-items: flex-end;
}


/* ============================================
   Mobile Navigation Overlay
   ============================================ */

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 90;
  opacity: 0;
  transition: opacity var(--transition);
}

.nav-overlay.active {
  display: block;
  opacity: 1;
}


/* ============================================
   Responsive
   ============================================ */

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

/* Mobile */
@media (max-width: 768px) {
  :root {
    --section-padding: 64px;
  }

  .header__nav,
  .header__cta {
    display: none;
  }

  .header__burger {
    display: flex;
  }

  /* Mobile menu */
  .header__nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    padding: 24px;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    z-index: 95;
    animation: slideDown 0.25s ease;
  }

  .header__nav.mobile-open .header__link {
    padding: 14px 0;
    font-size: 17px;
    border-bottom: 1px solid var(--color-border);
  }

  .header__nav.mobile-open .header__link:last-child {
    border-bottom: none;
  }

  .header__cta.mobile-show {
    display: inline-flex;
    margin: 16px 24px 24px;
    text-align: center;
    justify-content: center;
  }

  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .hero {
    min-height: auto;
    padding: calc(var(--header-height) + 48px) 0 64px;
  }

  .hero__platforms {
    margin-bottom: 40px;
  }

  .hero__typewriter {
    font-size: 22px;
  }

  .btn--large {
    padding: 14px 28px;
    font-size: 15px;
  }

  .about__inner {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .about__photo {
    max-width: 280px;
    margin: 0 auto;
  }

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

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

  .cases__phone {
    width: 200px;
    min-width: 200px;
    height: 433px;
  }

  .process__cta-banner {
    padding: 32px 24px;
  }

  .process__cta-text {
    font-size: 20px;
  }

  .faq__question {
    font-size: 15px;
    padding: 20px 0;
  }

  .footer__inner {
    flex-direction: column;
    gap: 24px;
  }

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

/* ============================================
   Scroll Reveal
   ============================================ */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}


@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero__title {
    font-size: 28px;
  }

  .hero__cta {
    width: 100%;
    max-width: 100%;
    white-space: normal;
    text-align: center;
  }

  .section__title {
    font-size: 28px;
    margin-bottom: 40px;
  }
}