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

:root {
  --color-bg: #0a0a0a;
  --color-accent: #ff8300;
  --color-accent-hover: #ff9933;
  --color-accent-soft: rgba(255, 131, 0, 0.28);
  --color-tor: #7d4698;
  --color-tor-soft: rgba(125, 70, 152, 0.22);
  --color-tor-muted: rgba(125, 70, 152, 0.1);
  --color-text: #e8e8e8;
  --color-text-muted: #888;
  --color-border: #1e1e1e;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --transition: 0.3s ease;
  --container: 1120px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol {
  list-style: none;
}

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  transition: opacity var(--transition);
}

.logo:hover {
  opacity: 0.8;
}

.logo__icon {
  width: 124px;
  height: auto;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav__link {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 4px;
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.nav__link--ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

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

.nav__link--accent {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

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

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.875rem 1.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 4px;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition), border-color var(--transition), color var(--transition);
}

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

.btn--accent:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 131, 0, 0.25);
}

.btn--ghost {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.btn--ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn--with-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn__icon {
  flex-shrink: 0;
  width: 1.125rem;
  height: 1.125rem;
}

.btn--accent .btn__icon {
  filter: brightness(0) saturate(100%);
}

.btn__label {
  text-align: center;
}

/* ===== Sections ===== */
section {
  padding-block: 6rem;
  transition: background-color var(--transition);
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 2rem;
}

.section-title--center {
  justify-content: center;
}

.section-title__icon {
  flex-shrink: 0;
  width: 2.75rem;
  height: auto;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding-block: 5rem 6rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-radial-gradient(
    circle at 78% 48%,
    transparent 0,
    transparent 52px,
    rgba(255, 131, 0, 0.06) 52px,
    rgba(255, 131, 0, 0.06) 53px
  );
  mask-image: linear-gradient(to left, #000 25%, transparent 88%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 75% at 80% 50%, rgba(125, 70, 152, 0.09), transparent 68%),
    linear-gradient(110deg, rgba(255, 131, 0, 0.06) 0%, transparent 42%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
}

.hero__label {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-tor);
  margin-bottom: 1rem;
}

.hero__label::before {
  content: "";
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  margin-right: 0.5rem;
  border-radius: 50%;
  background-color: var(--color-tor);
  opacity: 0.7;
  vertical-align: middle;
  box-shadow: 0 0 8px var(--color-tor-soft);
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
}

.hero__text {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  max-width: 28rem;
  margin-bottom: 2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero__actions .btn {
  flex: 1 1 0;
  min-width: 9rem;
}

.hero__figure {
  display: flex;
  justify-content: center;
}

.hero__image {
  width: 100%;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 0 48px var(--color-tor-muted);
  height: auto;
}

/* ===== About ===== */
.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
}

.about__image {
  width: 100%;
  border-radius: 8px;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.about__text {
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.about__text:last-child {
  margin-bottom: 0;
}

/* ===== Advantages ===== */
.advantages {
  background-color: #0d0d0d;
}

.advantages__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.advantage {
  padding: 2rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color var(--transition), transform var(--transition);
}

.advantage:hover {
  border-color: var(--color-accent-soft);
  transform: translateY(-4px);
}

.advantage__icon {
  margin-bottom: 1.25rem;
}

.advantage__title {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.625rem;
}

.advantage__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ===== Install ===== */
.install {
  position: relative;
}

.install::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(100%, 40rem);
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-accent-soft) 20%,
    var(--color-tor-soft) 80%,
    transparent
  );
  opacity: 0.6;
}

.install__intro {
  text-align: center;
  color: var(--color-text-muted);
  max-width: 36rem;
  margin: -1rem auto 2.5rem;
}

.install__list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.install-card {
  display: flex;
  flex-direction: column;
  padding: 2rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color var(--transition), transform var(--transition);
}

.install-card:hover {
  border-color: var(--color-tor-soft);
  transform: translateY(-4px);
}

.install-card__icon {
  margin-bottom: 1.25rem;
}

.install-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.install-card__title::before {
  content: "";
  display: inline-block;
  width: 0.375rem;
  height: 0.375rem;
  margin-right: 0.5rem;
  border-radius: 50%;
  background-color: var(--color-tor);
  opacity: 0.55;
  vertical-align: middle;
}

.install-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.install-card__btn {
  width: 100%;
  margin-top: auto;
}

/* ===== Conclusion ===== */
.conclusion {
  background-color: #0d0d0d;
}

.conclusion__inner {
  text-align: center;
  max-width: 40rem;
  margin-inline: auto;
}

.conclusion__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.conclusion__text {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  margin-bottom: 2rem;
}

/* ===== Social ===== */
.social-section {
  background-color: var(--color-bg);
}

.social-section__inner {
  text-align: center;
}

.social-section__title {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

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

.social__item {
  flex: 1;
  max-width: 11rem;
}

.social__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
  transition: transform var(--transition);
}

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

.social__icon-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  transition: transform var(--transition);
}

.social__link:hover .social__icon-wrap {
  transform: scale(1.05);
}

.social__icon {
  width: 3rem;
  height: 3rem;
  object-fit: contain;
}

.social__name {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
}

.social__desc {
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.footer {
  padding-block: 2rem;
  border-top: 1px solid var(--color-border);
}

.footer__copy {
  text-align: center;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero__inner,
  .about__inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero__figure {
    order: -1;
  }

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

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

@media (max-width: 540px) {
  section {
    padding-block: 4rem;
  }

  .nav__link {
    padding: 0.4rem 0.875rem;
    font-size: 0.75rem;
  }

  .hero__text {
    font-size: 1rem;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
    min-width: 0;
  }

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

  .social__list {
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }

  .social__item {
    max-width: 16rem;
  }
}