/* ==========================================================================
   Blast Interactive — стили лендинга
   Методология: BEM. Без вложенных селекторов.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Цвета */
  --color-bg: #070a13;
  --color-bg-alt: #0c1120;
  --color-surface: #10162a;
  --color-surface-alt: #161d35;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.14);

  --color-text: #eef1f8;
  --color-text-muted: #9aa3bd;
  --color-text-faint: #6b7390;

  --color-primary: #6d5bf6;
  --color-primary-light: #8b7bff;
  --color-secondary: #ec4faa;
  --color-accent: #22d3ee;

  --gradient-primary: linear-gradient(135deg, #6d5bf6 0%, #a34bf0 55%, #ec4faa 100%);
  --gradient-text: linear-gradient(135deg, #ffffff 0%, #c9c4ff 100%);

  /* Типографика */
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: "Space Grotesk", "Inter", sans-serif;

  /* Отступы / радиусы */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 7rem;

  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-full: 999px;

  --container-width: 1160px;
  --header-height: 76px;

  --shadow-md: 0 20px 40px -20px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 30px 60px -25px rgba(0, 0, 0, 0.65);

  --transition: 0.25s ease;
}

/* ---------- Reset ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

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

svg {
  display: block;
}

/* ---------- Base ---------- */
.page {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

section {
  scroll-margin-top: var(--header-height);
}

/* ---------- Кнопки ---------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 0.9rem 1.8rem;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition);
}

.button--primary {
  color: #ffffff;
  background-image: var(--gradient-primary);
  box-shadow: 0 12px 30px -10px rgba(109, 91, 246, 0.55);
}

.button--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 36px -10px rgba(109, 91, 246, 0.7);
}

.button--ghost {
  color: var(--color-text);
  background-color: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border-strong);
}

.button--ghost:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.24);
}

.button--large {
  padding: 1.05rem 2.2rem;
  font-size: 1rem;
}

.button--small {
  padding: 0.6rem 1.3rem;
  font-size: 0.85rem;
}

/* ---------- Заголовок секции ---------- */
.section-head {
  max-width: 640px;
  margin: 0 auto var(--space-6);
  text-align: center;
}

.section-head__eyebrow {
  display: inline-block;
  margin-bottom: var(--space-2);
  color: var(--color-primary-light);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section-head__title {
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section-head__text {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* ==========================================================================
   Header
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition), border-color var(--transition), backdrop-filter var(--transition);
}

.header--scrolled {
  background-color: rgba(7, 10, 19, 0.75);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.header__logo-mark {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background-image: var(--gradient-primary);
  box-shadow: 0 0 16px 2px rgba(109, 91, 246, 0.7);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__nav-link {
  position: relative;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

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

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

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

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

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

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding-top: var(--header-height);
  overflow: hidden;
  background-color: var(--color-bg);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
}

.hero__glow--one {
  top: -10%;
  left: -8%;
  width: 46vw;
  height: 46vw;
  background-image: radial-gradient(circle, var(--color-primary), transparent 70%);
  animation: hero-float 14s ease-in-out infinite;
}

.hero__glow--two {
  bottom: -18%;
  right: -10%;
  width: 40vw;
  height: 40vw;
  background-image: radial-gradient(circle, var(--color-secondary), transparent 70%);
  animation: hero-float 16s ease-in-out infinite reverse;
}

.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, rgba(0, 0, 0, 0.9), transparent 75%);
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
  text-align: center;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  margin-bottom: var(--space-3);
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 500;
}

.hero__title {
  margin-bottom: var(--space-3);
  background-image: var(--gradient-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 7vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.hero__subtitle {
  margin: 0 auto var(--space-5);
  max-width: 560px;
  color: var(--color-text-muted);
  font-size: clamp(1rem, 1.4vw, 1.2rem);
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  left: 50%;
  bottom: var(--space-4);
  z-index: 1;
  width: 22px;
  height: 36px;
  border: 1.5px solid var(--color-border-strong);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
}

.hero__scroll-line {
  position: absolute;
  top: 6px;
  left: 50%;
  width: 3px;
  height: 8px;
  border-radius: var(--radius-full);
  background-color: var(--color-text-muted);
  transform: translateX(-50%);
  animation: hero-scroll 2s ease-in-out infinite;
}

@keyframes hero-float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(3%, 4%) scale(1.08); }
}

@keyframes hero-scroll {
  0% { opacity: 1; transform: translate(-50%, 0); }
  70% { opacity: 0; transform: translate(-50%, 14px); }
  100% { opacity: 0; transform: translate(-50%, 14px); }
}

/* ==========================================================================
   Services
   ========================================================================== */
.services {
  padding: var(--space-7) 0;
  background-color: var(--color-bg-alt);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.service-card {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  transition: transform var(--transition), border-color var(--transition), background-color var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-strong);
  background-color: var(--color-surface-alt);
}

.service-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-3);
  border-radius: var(--radius-md);
  background-image: var(--gradient-primary);
  color: #ffffff;
}

.service-card__icon svg {
  width: 28px;
  height: 28px;
}

.service-card__title {
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
}

.service-card__text {
  color: var(--color-text-muted);
  font-size: 0.98rem;
}

/* ==========================================================================
   About
   ========================================================================== */
.about {
  padding: var(--space-7) 0;
  background-color: var(--color-bg);
}

.about__grid {
  display: grid;
  grid-template-columns: 0.9fr 1fr;
  align-items: center;
  gap: var(--space-6);
}

.about__media {
  position: relative;
}

.about__media-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-strong);
  box-shadow: var(--shadow-lg);
}

.about__media-glow {
  position: absolute;
  z-index: -1;
  top: 10%;
  left: -14%;
  width: 60%;
  height: 60%;
  border-radius: 50%;
  background-image: radial-gradient(circle, var(--color-primary), transparent 70%);
  filter: blur(70px);
  opacity: 0.5;
}

.about__content .section-head__eyebrow,
.about__content .section-head__title {
  text-align: left;
}

.about__content .section-head__title {
  margin-bottom: var(--space-3);
}

.about__text {
  margin-bottom: var(--space-2);
  color: var(--color-text-muted);
  font-size: 1.02rem;
}

.about__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-3);
}

.about__list-item {
  position: relative;
  padding-left: 1.7rem;
  color: var(--color-text);
  font-size: 0.98rem;
  font-weight: 500;
}

.about__list-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35em;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  background-image: var(--gradient-primary);
}

.about__list-item::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 0.62em;
  width: 6px;
  height: 3px;
  border-left: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(-45deg);
}

/* ==========================================================================
   Contact
   ========================================================================== */
.contact {
  padding: var(--space-7) 0;
  background-color: var(--color-bg-alt);
}

.contact__inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.contact__text {
  margin: 0 auto var(--space-4);
  max-width: 480px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

.contact__cta {
  margin-bottom: var(--space-3);
}

.contact__cta-icon {
  width: 20px;
  height: 20px;
}

.contact__address {
  color: var(--color-text-faint);
  font-size: 0.9rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1);
}

.footer__brand {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
}

.footer__copy,
.footer__address {
  color: var(--color-text-faint);
  font-size: 0.85rem;
}

.footer__inner .footer__address {
  width: 100%;
  order: 3;
}

/* ==========================================================================
   Адаптив
   ========================================================================== */
@media (max-width: 1024px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .about__media {
    max-width: 480px;
    margin: 0 auto;
  }

  .about__content .section-head__eyebrow,
  .about__content .section-head__title,
  .about__content .about__text {
    text-align: center;
  }

  .about__list {
    align-items: center;
  }

  .about__list-item {
    text-align: left;
  }
}

@media (max-width: 900px) {
  .services__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-4) var(--space-4);
    background-color: rgba(7, 10, 19, 0.97);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

  .header__nav--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }

  .header__nav-cta {
    align-self: flex-start;
  }

  .header__burger {
    display: flex;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-3);
  }

  .hero__actions {
    flex-direction: column;
    width: 100%;
  }

  .hero__actions .button {
    width: 100%;
  }

  .footer__inner {
    justify-content: center;
    text-align: center;
  }
}

@media (max-width: 420px) {
  .hero__title {
    font-size: clamp(2.2rem, 11vw, 2.8rem);
  }

  .service-card {
    padding: var(--space-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero__glow,
  .hero__scroll-line {
    animation: none;
  }
}