/* ===== БАЗА ДЛЯ ДОП-СТРАНИЦЫ ===== */

body {
  background-color: #f3f5f8;
}

/* чтобы контент не залезал под фикс-меню */
.letters-page {
  padding-top: 90px;
}

/* Кнопка "Вернуться на главную" */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 24px 0 10px;
  font-size: 14px;
  font-weight: 500;
  color: #1c4f6b;
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid rgba(28, 79, 107, 0.14);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.04);
  transition: all 0.25s ease;
}

.back-link:hover {
  color: #00AEEF;
  border-color: #00AEEF;
  transform: translateY(-1px);
}

/* ===== HERO-БЛОК ===== */

.letters-hero {
  padding: 10px 0 70px;
}

.letters-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr);
  gap: 48px;
  align-items: center;
}

/* левая картинка-схема */
.letters-hero-image {
  background: radial-gradient(circle at 0 0, #ffffff 0%, #dde7f1 45%, #a2b7c9 100%);
  border-radius: 24px;
  padding: 18px;
  box-shadow: 0 22px 45px rgba(10, 34, 54, 0.25);
}

.letters-hero-image img {
  width: 100%;
  display: block;
  border-radius: 18px;
}

/* правая колонка */
.letters-hero-content {
  max-width: 560px;
}

.letters-breadcrumb {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8aa0b3;
  margin-bottom: 6px;
}

.letters-hero-content h1 {
  font-size: 32px;
  line-height: 1.2;
  font-weight: 800;
  color: #1c4f6b;
  margin-bottom: 14px;
}

.letters-lead {
  font-size: 15px;
  line-height: 1.6;
  color: #48647b;
  margin-bottom: 18px;
}

/* список преимуществ */
.letters-list {
  list-style: none;
  padding: 0;
  margin: 0 0 22px;
}

.letters-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: #22435b;
  margin-bottom: 6px;
}

.letters-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  top: 0;
  color: #00AEEF;
  font-size: 18px;
}

/* характеристики */
.letters-specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
  margin-bottom: 20px;
}

.spec-item {
  background: #ffffff;
  border-radius: 12px;
  padding: 10px 12px;
  border: 1px solid rgba(12, 68, 101, 0.08);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
}

.spec-label {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #8aa0b3;
  margin-bottom: 2px;
}

.spec-value {
  font-size: 13px;
  font-weight: 600;
  color: #1c4f6b;
}

/* CTA-кнопка */
.letters-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  border-radius: 999px;
  background: linear-gradient(90deg, #00AEEF 0%, #11BDF0 40%, #EE5199 100%);
  color: #ffffff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 10px 25px rgba(0, 174, 239, 0.4);
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.letters-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 32px rgba(0, 174, 239, 0.5);
  opacity: 0.96;
}

.letters-cta.secondary {
  background: #ffffff;
  color: #1c4f6b;
  border: 1px solid #00AEEF;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.06);
}

.letters-cta.secondary:hover {
  background: #00AEEF;
  color: #ffffff;
}

.letters-note {
  margin-top: 10px;
  font-size: 12px;
  color: #6a8296;
}

/* ===== ГАЛЕРЕЯ ===== */

.letters-gallery {
  padding: 10px 0 80px;
}

.letters-gallery-header {
  text-align: left;
  margin-bottom: 26px;
}

.letters-gallery-header h2 {
  font-size: 24px;
  font-weight: 800;
  color: #1c4f6b;
  margin-bottom: 6px;
}

.letters-gallery-header p {
  font-size: 14px;
  color: #566d82;
}

/* сетка картинок */
.letters-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.letters-grid-item {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background: #d1d8df;
  box-shadow: 0 14px 30px rgba(12, 42, 64, 0.28);
  aspect-ratio: 4 / 3;   /* одинаковые размеры */
}

.letters-grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}

.letters-grid-item:hover img {
  transform: scale(1.05);
}

.letters-bottom-cta {
  margin-top: 26px;
  text-align: center;
}

.letters-bottom-cta p {
  font-size: 14px;
  color: #324b62;
  margin-bottom: 10px;
}

/* ===== АДАПТИВ ===== */

@media (max-width: 991px) {
  .letters-hero-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .letters-hero-image {
    max-width: 560px;
    margin: 0 auto;
  }

  .letters-hero-content {
    max-width: 100%;
  }

  .letters-specs {
    grid-template-columns: 1fr 1fr;
  }

  .letters-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .letters-page {
    padding-top: 80px;
  }

  .back-link {
    margin-top: 18px;
  }

  .letters-hero {
    padding-bottom: 50px;
  }

  .letters-hero-content h1 {
    font-size: 26px;
  }

  .letters-lead {
    font-size: 14px;
  }

  .letters-specs {
    grid-template-columns: 1fr;
  }

  .letters-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .letters-grid-item {
    border-radius: 14px;
  }
}

@media (max-width: 576px) {
  .letters-grid {
    grid-template-columns: 1fr;
  }

  .back-link {
    width: 100%;
    justify-content: center;
  }
}