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

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111118;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --text-primary: #f0f0f5;
  --text-secondary: #9999aa;
  --accent: #6c5ce7;
  --accent-light: #a29bfe;
  --accent-glow: rgba(108, 92, 231, 0.3);
  --gradient: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%);
  --border: rgba(255, 255, 255, 0.06);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s ease;
  --container: 1200px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

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

/* ===========================
   TYPOGRAPHY
   =========================== */
.section-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 48px;
}

/* ===========================
   BUTTONS
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn--primary {
  background: var(--gradient);
  color: #fff;
  padding: 12px 28px;
  font-size: 0.95rem;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn--lg {
  padding: 16px 40px;
  font-size: 1.05rem;
}

.btn--hero {
  margin-top: 36px;
  padding: 16px 40px;
  font-size: 1.1rem;
  letter-spacing: 0.5px;
}

/* ===========================
   HEADER
   =========================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
}

.logo span {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
  position: relative;
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient);
  transition: var(--transition);
}

.nav__link:hover::after {
  width: 100%;
}

.header__btn {
  font-size: 0.85rem;
  padding: 10px 22px;
}

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.burger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.burger.active span:nth-child(2) {
  opacity: 0;
}
.burger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===========================
   HERO
   =========================== */
.hero {
  position: relative;
  padding: 160px 0 100px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 20%, var(--accent-glow) 0%, transparent 60%);
  pointer-events: none;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  position: relative;
}

.hero__tagline {
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-light);
  margin-bottom: 20px;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin-bottom: 48px;
  line-height: 1.7;
}

.hero__stats {
  display: flex;
  gap: 40px;
}

.stat {
  text-align: center;
}

.stat__number {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat__label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
  display: block;
}

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

.hero__image img {
  border-radius: var(--radius);
  width: 100%;
  max-width: 560px;
  object-fit: cover;
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

/* ===========================
   ABOUT
   =========================== */
.about {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.about__desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 16px;
  line-height: 1.7;
}

.about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 36px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.stat-card__number {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent-light);
}

.stat-card__label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
  margin-top: 4px;
}

.about__image-col {
  position: relative;
}

.about__image {
  border-radius: var(--radius);
  width: 100%;
  object-fit: cover;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.about__roi {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 28px;
  text-align: center;
  backdrop-filter: blur(10px);
}

.about__roi-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-light);
}

.about__roi-value {
  display: block;
  font-size: 1.3rem;
  font-weight: 800;
  margin: 4px 0;
}

.about__roi-sub {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===========================
   SERVICES
   =========================== */
.services {
  padding: 100px 0;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
}

.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(108, 92, 231, 0.1);
}

.service-card--accent {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(108,92,231,0.08) 0%, var(--bg-card) 100%);
}

.service-card__icon {
  color: var(--accent-light);
  margin-bottom: 20px;
}

.service-card__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card__desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 20px;
}

.service-card__metric {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
  background: rgba(108, 92, 231, 0.1);
  padding: 6px 14px;
  border-radius: 20px;
}

/* ===========================
   CASES
   =========================== */
.cases {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.cases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

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

.case-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.case-card__tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light);
  background: rgba(108, 92, 231, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
}

.case-card__duration {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.case-card__result {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.case-card__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
}

.case-card__status {
  font-size: 0.8rem;
  color: #4ecdc4;
  font-weight: 600;
}

/* ===========================
   ADVANTAGES
   =========================== */
.advantages {
  padding: 100px 0;
}

.advantages__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

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

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

.adv-card__icon {
  color: var(--accent-light);
  margin-bottom: 20px;
}

.adv-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.adv-card__desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===========================
   FAQ
   =========================== */
.faq {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.faq__list {
  max-width: 800px;
  margin: 48px auto 0;
}

.faq-item {
  border-bottom: 1px solid var(--border);
}

.faq-item__question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px 0;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
}

.faq-item__question:hover {
  color: var(--accent-light);
}

.faq-item__chevron {
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--text-secondary);
}

.faq-item.active .faq-item__chevron {
  transform: rotate(180deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.active .faq-item__answer {
  max-height: 300px;
}

.faq-item__answer p {
  padding-bottom: 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ===========================
   CONTACT
   =========================== */
.contact {
  padding: 100px 0;
  text-align: center;
}

.contact__form {
  max-width: 640px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group--full {
  grid-column: 1 / -1;
}

.contact__form input,
.contact__form textarea {
  width: 100%;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}

.contact__form input::placeholder,
.contact__form textarea::placeholder {
  color: var(--text-secondary);
}

.contact__form input:focus,
.contact__form textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.contact__form textarea {
  resize: vertical;
  min-height: 100px;
}

.contact__form .btn {
  grid-column: 1 / -1;
  margin-top: 8px;
}

/* ===========================
   FOOTER
   =========================== */
.footer {
  padding: 60px 0 40px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}

.logo--footer {
  font-size: 1.2rem;
  margin-bottom: 12px;
  display: inline-block;
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

.footer__heading {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer__link {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
  transition: var(--transition);
}

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

/* ===========================
   ANIMATIONS — Fade In on Scroll
   =========================== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1024px) {
  .services__grid,
  .cases__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .advantages__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    border-bottom: 1px solid var(--border);
  }

  .nav.open {
    max-height: 400px;
    padding: 16px 0;
  }

  .nav__link {
    padding: 12px 24px;
    width: 100%;
    text-align: center;
  }

  .burger {
    display: flex;
  }

  .header__btn {
    display: none;
  }

  .hero__inner,
  .about__inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero {
    padding: 120px 0 60px;
    text-align: center;
  }

  .hero__subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero__stats {
    justify-content: center;
  }

  .hero__image {
    order: -1;
  }

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

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

  .footer__inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

  .about__roi {
    position: relative;
    bottom: auto;
    left: auto;
    margin-top: 16px;
  }
}