/* ===================== ПЕРЕМЕННЫЕ ===================== */
:root {
  --bg: #0a0a0b;
  --bg-alt: #131315;
  --surface: #1a1a1d;
  --surface-2: #212124;
  --border: #2a2a2e;
  --text: #f2f2f0;
  --text-dim: #a7a7ad;
  --text-faint: #6f6f76;
  --accent: #3d7fff;
  --accent-2: #6aa1ff;
  --accent-dim: rgba(61, 127, 255, 0.14);

  --container: 1160px;
  --radius: 14px;
  --transition: 0.25s ease;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }
h1, h2, h3, p { margin: 0; }
ul { list-style: none; margin: 0; padding: 0; }

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

/* ===================== КНОПКИ ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }

.btn--primary {
  background: var(--accent);
  color: #fff;
}
.btn--primary:hover { background: var(--accent-2); }

.btn--ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent-2); }

.btn--small { padding: 10px 20px; font-size: 14px; }

/* ===================== ШАПКА ===================== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.72);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.header.scrolled {
  border-bottom-color: var(--border);
  background: rgba(10, 10, 11, 0.9);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.logo--small { font-size: 16px; }

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  font-size: 15px;
  color: var(--text-dim);
  transition: color var(--transition);
}
.nav__link:hover { color: var(--text); }

.nav__cta { margin-left: 8px; }

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
}
.burger span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  transition: transform var(--transition), opacity var(--transition);
}
.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===================== HERO ===================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 76px;
}

.hero__glow {
  position: absolute;
  top: -20%;
  left: 50%;
  width: 900px;
  height: 900px;
  transform: translateX(-50%);
  background: radial-gradient(circle, var(--accent-dim) 0%, transparent 65%);
  pointer-events: none;
}

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

.hero__eyebrow {
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  font-weight: 600;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(36px, 6vw, 68px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero__subtitle {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--text-dim);
  max-width: 640px;
  margin: 0 auto 44px;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===================== СЕКЦИИ ===================== */
.section {
  padding: 120px 0;
}
.section--alt { background: var(--bg-alt); }

.section__title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  letter-spacing: -0.01em;
  text-align: center;
}

.section__subtitle {
  text-align: center;
  color: var(--text-dim);
  font-size: 17px;
  max-width: 560px;
  margin: 16px auto 0;
}

/* ===================== КАРТОЧКИ УСЛУГ ===================== */
.cards {
  display: grid;
  gap: 20px;
  margin-top: 56px;
}
.cards--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.card__num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent-2);
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}

.card__title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
}

.card__text {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.6;
}

.card--plain { background: transparent; }
.card--plain:hover { transform: none; border-color: var(--border); }

/* ===================== ПОРТФОЛИО ===================== */
.project {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), transform var(--transition);
}
.project:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.project__thumb {
  aspect-ratio: 16 / 10;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}

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

.project__body { padding: 26px; }

.project__tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 10px;
}

.project__title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.project__text {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 18px;
}

.project__link {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-2);
  transition: color var(--transition);
}
.project__link:hover { color: var(--accent); }

/* ===================== ЦЕНЫ ===================== */
.pricing {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  margin-top: 56px;
  flex-wrap: wrap;
}

.pricing__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.pricing__value {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  color: var(--accent-2);
}

.pricing__label {
  font-size: 15px;
  color: var(--text-dim);
}

.pricing__divider {
  width: 1px;
  height: 56px;
  background: var(--border);
}

.pricing__note {
  text-align: center;
  color: var(--text-faint);
  font-size: 14px;
  margin-top: 36px;
}

/* ===================== КОНТАКТЫ ===================== */
.contacts__inner { text-align: center; }

.contacts__title {
  font-size: clamp(28px, 4.5vw, 46px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.contacts__subtitle {
  color: var(--text-dim);
  font-size: 17px;
  margin: 20px auto 40px;
  max-width: 480px;
}

.contacts__buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===================== ФОРМА ЗАЯВКИ ===================== */
.lead-form {
  max-width: 560px;
  margin: 48px auto 0;
  text-align: left;
}

.lead-form__row {
  display: flex;
  gap: 16px;
}
.lead-form__row .lead-form__field { flex: 1; }

.lead-form__field {
  margin-bottom: 18px;
}

.lead-form__label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.lead-form__input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px 16px;
  font-size: 15px;
  color: var(--text);
  font-family: inherit;
  transition: border-color var(--transition), background var(--transition);
}
.lead-form__input::placeholder { color: var(--text-faint); }
.lead-form__input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface-2);
}

.lead-form__textarea {
  resize: vertical;
  min-height: 96px;
}

.lead-form__submit {
  width: 100%;
  margin-top: 4px;
}
.lead-form__submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.lead-form__legal {
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
  margin-top: 14px;
  line-height: 1.5;
}

.lead-form__status {
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  margin-top: 16px;
  min-height: 20px;
}
.lead-form__status.is-success { color: #4ade80; }
.lead-form__status.is-error { color: #f87171; }

/* ===================== ФУТЕР ===================== */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer__copy {
  font-size: 13px;
  color: var(--text-faint);
}

/* ===================== КНОПКА НАВЕРХ ===================== */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition), border-color var(--transition);
  z-index: 90;
}
.to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover { border-color: var(--accent); color: var(--accent-2); }

/* ===================== АНИМАЦИЯ ПОЯВЛЕНИЯ ===================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================== АДАПТИВ ===================== */
@media (max-width: 900px) {
  .cards--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .burger { display: flex; }

  .nav {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(10, 10, 11, 0.98);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px 20px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition);
  }
  .nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
  .nav__link {
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav__cta {
    margin: 16px 0 0;
    text-align: center;
  }

  .section { padding: 80px 0; }

  .cards--4 { grid-template-columns: 1fr; }

  .pricing { gap: 28px; }
  .pricing__divider { display: none; }

  .lead-form__row { flex-direction: column; gap: 0; }

  .to-top { right: 16px; bottom: 16px; }
}