/* ===== Variables ===== */
:root {
  --color-bg: #0f0f12;
  --color-bg-card: #1a1a1f;
  --color-text: #e8e8ec;
  --color-text-muted: #9ca3af;
  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-border: #2d2d35;
  --font: 'Onest', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  opacity: 0.9;
}

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

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 768px) {
  .container {
    padding: 0 24px;
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 32px;
  }
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 15, 18, 0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

@media (min-width: 768px) {
  .header__inner {
    min-height: 72px;
  }
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.header__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
}

.header__city {
  color: var(--color-text-muted);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.header__lang {
  border: 1px solid var(--color-border);
  background: rgba(15, 15, 18, 0.6);
  padding: 4px 9px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.header__lang_active {
  color: #fff;
  background: var(--color-accent);
  border-color: transparent;
}

.header__divider {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.header__phone {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-accent);
}

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

/* ===== Lang visibility ===== */
.lang {
  display: inline;
}

body.is-lang-en .lang-ru {
  display: none;
}

body.is-lang-en .lang-en {
  display: inline;
}

body.is-lang-ru .lang-en {
  display: none;
}

body.is-lang-ru .lang-ru {
  display: inline;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 48px 0 64px;
  overflow: hidden;
}

@media (min-width: 768px) {
  .hero {
    padding: 72px 0 96px;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding: 96px 0 120px;
  }
}

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

.hero__title {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto 28px;
}

.hero .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.2), transparent),
              radial-gradient(ellipse 60% 40% at 80% 50%, rgba(99, 102, 241, 0.08), transparent);
  pointer-events: none;
}

/* ===== Buttons ===== */
.btn {
  padding: 14px 28px;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn_primary {
  background: var(--color-accent);
  color: #fff;
}

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

.btn_secondary {
  background: var(--color-bg-card);
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

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

/* ===== Section title ===== */
.section-title {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 36px;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .section-title {
    margin-bottom: 48px;
  }
}

/* ===== Services ===== */
.services {
  padding: 56px 0 64px;
}

@media (min-width: 768px) {
  .services {
    padding: 72px 0 88px;
  }
}

@media (min-width: 1024px) {
  .services {
    padding: 96px 0 112px;
  }
}

.services__grid {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }
}

/* ===== Cards ===== */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  box-shadow: var(--shadow);
}

.card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  border-radius: var(--radius);
  margin-bottom: 18px;
}

.card__icon_bots {
  background: rgba(99, 102, 241, 0.15);
}

.card__icon_ai {
  background: rgba(34, 197, 94, 0.15);
}

.card__icon_shop {
  background: rgba(249, 115, 22, 0.15);
}

.card__title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.card__text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ===== Stack (AI platforms) ===== */
.stack {
  padding: 8px 0 40px;
}

.stack__inner {
  border-radius: 20px;
  border: 1px solid var(--color-border);
  background: rgba(15, 15, 18, 0.9);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

@media (min-width: 768px) {
  .stack__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
  }
}

.stack__block {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stack__block_tech {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding-top: 10px;
}

@media (min-width: 768px) {
  .stack__block_tech {
    border-top: none;
    border-left: 1px solid rgba(148, 163, 184, 0.2);
    padding-top: 0;
    padding-left: 16px;
  }
}

.stack__label {
  font-size: 0.85rem;
  color: #e5e7eb;
  font-weight: 500;
}

.stack__logos {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.stack__logo {
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: radial-gradient(circle at 0 0, rgba(148, 163, 184, 0.25), transparent);
  color: var(--color-text-muted);
  white-space: nowrap;
}

/* ===== Portfolio ===== */
.portfolio {
  padding: 56px 0 64px;
}

@media (min-width: 768px) {
  .portfolio {
    padding: 72px 0 88px;
  }
}

@media (min-width: 1024px) {
  .portfolio {
    padding: 96px 0 112px;
  }
}

.portfolio__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .portfolio__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .portfolio__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.portfolio-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.portfolio-card__media {
  position: relative;
  overflow: hidden;
}

.portfolio-card__media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}

@media (min-width: 768px) {
  .portfolio-card__media img {
    height: 200px;
  }
}

.portfolio-card__media_multi {
  padding-bottom: 4px;
}

.portfolio-card__media-main img {
  height: 150px;
  object-fit: cover;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.portfolio-card__media-thumbs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  padding: 4px 4px 0;
}

.portfolio-card__media-thumbs img {
  height: 52px;
}

@media (min-width: 768px) {
  .portfolio-card__media-thumbs img {
    height: 60px;
  }
}

.portfolio-card__badge {
  position: absolute;
  left: 12px;
  top: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(15, 15, 18, 0.8);
  color: #fff;
  font-size: 0.75rem;
}

.portfolio-card__body {
  padding: 18px 18px 20px;
}

.portfolio-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.portfolio-card__text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ===== CTA ===== */
.cta {
  padding: 56px 0 64px;
}

@media (min-width: 768px) {
  .cta {
    padding: 72px 0 88px;
  }
}

.cta__inner {
  text-align: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
}

@media (min-width: 768px) {
  .cta__inner {
    padding: 56px 48px;
  }
}

.cta__title {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  font-weight: 700;
  margin-bottom: 10px;
}

.cta__text {
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.cta__btn {
  font-size: 1.1rem;
}

.cta__contacts {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.cta__contact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cta__label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.cta__value {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-accent);
}

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

/* ===== Footer ===== */
.footer {
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 12px 24px;
  text-align: center;
}

@media (min-width: 640px) {
  .footer__inner {
    justify-content: space-between;
    text-align: left;
  }
}

.footer__copy {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer__phone {
  font-weight: 600;
  color: var(--color-accent);
}

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