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

:root {
  --primary: #1a5276;
  --primary-dark: #0e3651;
  --accent: #2e86c1;
  --accent-light: #d6eaf8;
  --text: #2c3e50;
  --text-light: #5d6d7e;
  --bg: #ffffff;
  --bg-alt: #f8f9fa;
  --border: #e5e8eb;
  --radius: 12px;
  --shadow: 0 2px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.1);
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--primary);
}

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

/* ===== Container ===== */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: box-shadow var(--transition);
}

.header.scrolled {
  box-shadow: 0 1px 12px rgba(0,0,0,0.08);
}

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

/* Logo */
.logo {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-decoration: none;
}

.logo__main {
  color: var(--primary);
}

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

/* Nav */
.nav {
  display: flex;
  align-items: center;
}

.nav__link {
  margin-left: 32px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  position: relative;
}

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

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

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

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

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

/* ===== Section ===== */
.section {
  padding: 96px 0;
}

.section--alt {
  background: var(--bg-alt);
}

.section__title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 56px;
  color: var(--primary-dark);
}

/* ===== Hero ===== */
.hero {
  padding: 160px 0 120px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: #fff;
  text-align: center;
}

.hero__inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero__title {
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero__subtitle {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.7;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  text-align: center;
}

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

.btn--primary:hover {
  background: var(--accent-light);
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.btn--white {
  background: #fff;
  color: var(--primary);
}

.btn--white:hover {
  background: var(--accent-light);
  color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.btn--full {
  width: 100%;
  background: var(--primary);
  color: #fff;
}

.btn--full:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ===== About ===== */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.about__text p {
  margin-bottom: 16px;
  color: var(--text-light);
  font-size: 1.02rem;
}

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

.stat {
  background: var(--bg-alt);
  padding: 28px 32px;
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
}

.stat__number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.stat__label {
  color: var(--text-light);
  font-size: 0.9rem;
}

/* ===== Services Cards ===== */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

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

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

.card__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--primary-dark);
}

.card__text {
  color: var(--text-light);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ===== Advantages ===== */
.advantages__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.advantage {
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

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

.advantage__num {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
}

.advantage__title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--primary-dark);
}

.advantage__text {
  color: var(--text-light);
  font-size: 0.92rem;
}

/* ===== CTA ===== */
.cta {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: #fff;
  text-align: center;
}

.cta__inner {
  max-width: 600px;
  margin: 0 auto;
}

.cta__title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta__text {
  opacity: 0.9;
  margin-bottom: 32px;
  font-size: 1.05rem;
}

/* ===== Contact ===== */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.form__input {
  width: 100%;
  padding: 14px 16px;
  font-size: 0.95rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 16px;
  background: var(--bg);
  color: var(--text);
  transition: border-color var(--transition);
}

.form__input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(46,134,193,0.1);
}

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

.contact__info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 28px;
}

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  color: var(--text);
}

.contact__item svg {
  color: var(--accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact__item a {
  color: var(--text);
}

.contact__item a:hover {
  color: var(--accent);
}

/* ===== Footer ===== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__copy {
  font-size: 0.82rem;
  color: var(--text-light);
  margin-top: 8px;
}

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

.footer__nav a {
  font-size: 0.88rem;
  color: var(--text-light);
}

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

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

@media (max-width: 768px) {
  .section {
    padding: 64px 0;
  }

  .section__title {
    font-size: 1.6rem;
    margin-bottom: 40px;
  }

  /* Mobile nav */
  .burger {
    display: flex;
  }

  .nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    transform: translateY(-120%);
    transition: transform var(--transition);
    box-shadow: var(--shadow);
  }

  .nav.open {
    transform: translateY(0);
  }

  .nav__link {
    margin-left: 0;
    padding: 12px 0;
    font-size: 1rem;
    width: 100%;
    border-bottom: 1px solid var(--border);
  }

  /* Hero */
  .hero {
    padding: 120px 0 80px;
  }

  .hero__title {
    font-size: 1.85rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  /* About */
  .about__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* Services */
  .services__grid {
    grid-template-columns: 1fr;
  }

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

  /* Contact */
  .contact__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* Footer */
  .footer__inner {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }

  .footer__nav {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 1.55rem;
  }

  .cta__title {
    font-size: 1.5rem;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }
}