/* ========================================
   Variables & Reset
   ======================================== */
:root {
  --color-primary: #1e3a5f;
  --color-primary-dark: #152a45;
  --color-primary-light: #2a5080;
  --color-accent: #10b981;
  --color-accent-hover: #059669;
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-400: #94a3b8;
  --color-gray-600: #64748b;
  --color-gray-800: #1e293b;
  --color-white: #ffffff;
  --color-star: #fbbf24;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --header-height: 72px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(30, 58, 95, 0.08);
  --shadow-lg: 0 12px 40px rgba(30, 58, 95, 0.12);
  --transition: 0.3s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

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

/* ========================================
   Utilities
   ======================================== */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section__subtitle {
  font-size: 1.1rem;
  color: var(--color-gray-600);
  margin-bottom: 48px;
}

/* Fade-in animation */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.fade-in--delay {
  transition-delay: 0.15s;
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color var(--transition), color var(--transition),
    transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}

.btn--sm {
  padding: 10px 20px;
  font-size: 0.875rem;
}

.btn--lg {
  padding: 16px 32px;
  font-size: 1rem;
}

.btn--full {
  width: 100%;
}

.btn:not(.btn--outline):not(.btn--ghost) {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn:not(.btn--outline):not(.btn--ghost):hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.35);
}

.btn--outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn--outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-gray-200);
}

.btn--ghost:hover {
  border-color: var(--color-primary);
  background-color: var(--color-gray-50);
}

/* ========================================
   Header
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo__name {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-gray-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.logo__surname {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
}

.nav {
  display: none;
}

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

.nav__link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-600);
  transition: color var(--transition);
  position: relative;
}

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

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

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

.header__cta {
  display: none;
}

.burger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 110;
}

.burger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform var(--transition), opacity var(--transition);
}

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

.burger.active span:nth-child(2) {
  opacity: 0;
}

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

.nav.open {
  display: flex;
  position: fixed;
  inset: 0;
  top: var(--header-height);
  background: var(--color-white);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 105;
}

.nav.open .nav__list {
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.nav.open .nav__link {
  font-size: 1.25rem;
}

/* ========================================
   Hero
   ======================================== */
.hero {
  padding-top: calc(var(--header-height) + 48px);
  padding-bottom: 64px;
  background: linear-gradient(135deg, var(--color-gray-50) 0%, var(--color-white) 50%, #ecfdf5 100%);
  overflow: hidden;
}

.hero__inner {
  display: flex;
  flex-direction: column;
  gap: 48px;
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  background: var(--color-white);
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-gray-600);
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.hero__badge .counter {
  font-weight: 700;
  color: var(--color-accent);
}

.hero__title {
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-gray-600);
  margin-bottom: 32px;
  max-width: 520px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero__call {
  display: none;
}

.hero__photo {
  width: 100%;
  max-width: 360px;
}

.hero__photo-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero__photo-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid var(--color-accent);
  border-radius: var(--radius-lg);
  opacity: 0.3;
  pointer-events: none;
}

.hero__photo img {
  width: 100%;
  aspect-ratio: 6 / 7;
  object-fit: cover;
  background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

/* ========================================
   Services
   ======================================== */
.services {
  background-color: var(--color-white);
}

.services__grid {
  display: grid;
  gap: 24px;
}

.service-card {
  padding: 32px;
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
  transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.service-card__icon svg {
  width: 24px;
  height: 24px;
}

.service-card__title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.service-card__text {
  color: var(--color-gray-600);
  font-size: 0.9375rem;
  line-height: 1.7;
}

/* ========================================
   About
   ======================================== */
.about {
  background-color: var(--color-gray-50);
}

.about__inner {
  display: grid;
  gap: 48px;
}

.about__intro {
  font-size: 1.0625rem;
  color: var(--color-gray-600);
  margin-bottom: 24px;
  line-height: 1.7;
}

.about__achievements {
  margin-bottom: 32px;
}

.about__achievements li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--color-gray-600);
}

.about__achievements li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.about__certs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cert-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-gray-200);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-primary);
}

.cert-badge svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 24px 16px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.stat-card__number {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
}

.stat-card__label {
  font-size: 0.8125rem;
  color: var(--color-gray-600);
  margin-top: 4px;
}

/* ========================================
   Reviews
   ======================================== */
.reviews {
  background-color: var(--color-white);
}

.reviews__carousel {
  position: relative;
  overflow: hidden;
}

.reviews__track {
  display: flex;
  transition: transform 0.5s ease;
}

.review-card {
  flex: 0 0 100%;
  padding: 32px;
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
}

.review-card__stars {
  color: var(--color-star);
  font-size: 1.125rem;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.review-card__text {
  font-size: 1.0625rem;
  color: var(--color-gray-800);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: normal;
}

.review-card__author strong {
  display: block;
  color: var(--color-primary);
  font-weight: 600;
}

.review-card__author span {
  font-size: 0.875rem;
  color: var(--color-gray-600);
}

.reviews__controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}

.reviews__btn {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-gray-200);
  color: var(--color-primary);
  transition: background-color var(--transition), border-color var(--transition);
}

.reviews__btn:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.reviews__btn svg {
  width: 20px;
  height: 20px;
}

.reviews__dots {
  display: flex;
  gap: 8px;
}

.reviews__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-gray-200);
  transition: background-color var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
  padding: 0;
}

.reviews__dot.active {
  background-color: var(--color-accent);
  transform: scale(1.2);
}

/* ========================================
   Contacts
   ======================================== */
.contacts {
  background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
}

.contacts__inner {
  display: grid;
  gap: 48px;
}

.contacts__text {
  color: var(--color-gray-600);
  margin-bottom: 32px;
  font-size: 1.0625rem;
}

.contacts__links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-gray-200);
  font-weight: 500;
  color: var(--color-primary);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.contact-link:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow);
}

.contact-link svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  color: var(--color-accent);
}

.contact-form {
  background: var(--color-white);
  padding: 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-gray-200);
}

.yandex-form {
  padding: 16px;
}

.yandex-form iframe {
  display: block;
  width: 100%;
  min-height: 520px;
  border: none;
  border-radius: var(--radius);
  background: var(--color-white);
}

.yandex-form__fallback {
  margin-top: 12px;
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  text-align: center;
}

.yandex-form__fallback a {
  color: var(--color-accent);
  font-weight: 500;
}

.yandex-form__fallback a:hover {
  text-decoration: underline;
}

.form-disclaimer {
  margin-top: 12px;
  font-size: 0.75rem;
  color: var(--color-gray-400);
  text-align: center;
}

.form-disclaimer a {
  color: var(--color-accent);
  text-decoration: underline;
}

.form-disclaimer a:hover {
  text-decoration: underline;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: 32px 0;
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

.footer__copy {
  font-size: 0.875rem;
}

.footer__nav {
  display: flex;
  gap: 24px;
}

.footer__nav a {
  font-size: 0.875rem;
  transition: color var(--transition);
}

.footer__nav a:hover {
  color: var(--color-white);
}

/* ========================================
   Mobile Call Button
   ======================================== */
.mobile-call {
  display: flex;
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 90;
  width: 56px;
  height: 56px;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.45);
  transition: transform var(--transition), background-color var(--transition);
}

.mobile-call:hover {
  transform: scale(1.08);
  background-color: var(--color-accent-hover);
}

.mobile-call svg {
  width: 24px;
  height: 24px;
}

/* ========================================
   Privacy Page
   ======================================== */
.page-content {
  padding-top: calc(var(--header-height) + 48px);
  padding-bottom: 80px;
}

.page-content h1 {
  font-size: 2rem;
  color: var(--color-primary);
  margin-bottom: 24px;
}

.page-content h2 {
  font-size: 1.25rem;
  color: var(--color-primary);
  margin: 32px 0 12px;
}

.page-content p,
.page-content li {
  color: var(--color-gray-600);
  margin-bottom: 12px;
  line-height: 1.7;
}

.page-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 32px;
}

.back-link:hover {
  text-decoration: underline;
}

/* ========================================
   Responsive — Tablet
   ======================================== */
@media (min-width: 768px) {
  .section {
    padding: 100px 0;
  }

  .nav {
    display: block;
  }

  .header__cta {
    display: inline-flex;
  }

  .burger {
    display: none;
  }

  .hero {
    padding-top: calc(var(--header-height) + 80px);
    padding-bottom: 100px;
  }

  .hero__inner {
    flex-direction: row;
    align-items: center;
    text-align: left;
  }

  .hero__content {
    flex: 1;
  }

  .hero__photo {
    flex: 0 0 380px;
    max-width: 380px;
  }

  .hero__call {
    display: inline-flex;
  }

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

  .about__inner {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
  }

  .contacts__inner {
    grid-template-columns: 1fr 1.2fr;
    align-items: start;
  }

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .review-card {
    padding: 40px 48px;
  }
}

@media (min-width: 1024px) {
  .hero__photo {
    flex: 0 0 440px;
    max-width: 440px;
  }
}

@media (max-width: 480px) {
  .about__stats {
    grid-template-columns: 1fr;
  }

  .stat-card {
    flex-direction: row;
    justify-content: center;
    gap: 12px;
    padding: 16px;
  }

  .stat-card__label {
    margin-top: 0;
    align-self: center;
  }
}