:root {
  --page-bg: #f3f6ff;
  --surface: rgba(255, 255, 255, 0.92);
  --surface-strong: #ffffff;
  --text-main: #234156;
  --text-muted: #6b8293;
  --accent: #c9f1e1;
  --accent-dark: #4aa38c;
  --accent-soft: #e7f7ff;
  --line: rgba(74, 163, 140, 0.14);
  --shadow: 0 18px 40px rgba(112, 151, 177, 0.14);
}

html {
  font-size: 117%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  min-height: 100vh;
  font-family: "Manrope", "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top left, rgba(196, 233, 255, 0.65), transparent 24%),
    radial-gradient(circle at top right, rgba(207, 241, 224, 0.55), transparent 26%),
    linear-gradient(180deg, #ffffff 0%, var(--page-bg) 100%);
}

.site-header,
footer {
  backdrop-filter: blur(12px);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 10px 30px rgba(35, 65, 86, 0.08);
}

footer {
  background: rgba(255, 255, 255, 0.82);
}

.footer-logo-link {
  display: inline-flex;
  align-items: center;
  opacity: 0.92;
}

.footer-logo-link:hover,
.footer-logo-link:focus {
  opacity: 1;
}

.footer-logo {
  display: block;
  width: auto;
  height: 35px;
}

.navbar-brand {
  font-family: "Oswald", "Arial Narrow", sans-serif;
  font-size: 1.45rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-menu-toggler {
  border-color: rgba(74, 163, 140, 0.26);
  border-radius: 0.8rem;
  padding: 0.55rem 0.7rem;
}

.site-menu-toggler:focus {
  box-shadow: 0 0 0 0.18rem rgba(74, 163, 140, 0.18);
}

.site-nav-link {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  color: var(--text-main);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-nav-link:hover {
  background: rgba(184, 239, 227, 0.45);
}

.site-nav-link-active {
  background: linear-gradient(135deg, #dff5ff, #d9f4ea);
  box-shadow: inset 0 0 0 1px rgba(74, 163, 140, 0.18);
}

.site-nav-link-accent {
  background: linear-gradient(135deg, #dff5ff, #d9f4ea);
}

.hero-block {
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(231, 247, 255, 0.92));
  box-shadow: var(--shadow);
}

.hero-block.hero-landing {
  padding: 3rem;
  background-image: url("/static/img/hero.8e8c4e239b86.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.kolzov-photo {
  max-width: 100%;
  border-radius: 15px;
}
.eyebrow {
  display: inline-flex;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  background: rgba(196, 233, 255, 0.58);
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow-dark {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
}

.eyebrow-contrast {
  background: rgba(74, 163, 140, 0.12);
}

.landing-kicker {
  font-family: "Oswald", "Arial Narrow", sans-serif;
  font-size: 1rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.landing-title,
.landing-section-title {
  font-family: "Oswald", "Arial Narrow", sans-serif;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.landing-title {
  font-size: clamp(2.8rem, 6vw, 5.6rem);
  line-height: 0.96;
  overflow-wrap: anywhere;
}

.landing-title-sm {
  font-size: clamp(2.4rem, 5vw, 4.6rem);
}

.landing-lead {
  max-width: 42rem;
  font-size: 1.08rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.landing-side-panel,
.landing-list-card {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow);
}

.landing-note {
  padding: 1.25rem;
  border-radius: 1.15rem;
  background: linear-gradient(135deg, #6fc4d8, #5db89f);
  color: #ffffff;
}

.section-card,
.kfs-relation-card,
.usage-box,
.quote-block,
.feature-card,
.video-card,
.placeholder-image {
  background: var(--surface);
  border: 1px solid var(--line);
}

.section-card,
.kfs-relation-card,
.feature-card,
.video-card,
.quote-block {
  box-shadow: var(--shadow);
}

.usage-box {
  padding: 1rem 1.1rem;
  border-radius: 1rem;
}

.quote-block,
.feature-card,
.video-card {
  border-radius: 1.5rem;
}

.quote-block {
  padding: 2rem;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(223, 245, 255, 0.94));
}

.quote-block blockquote {
  margin: 0;
  font-size: 1.2rem;
  line-height: 1.7;
}

.quote-block-highlight {
  border-left: 8px solid #6fc4d8;
}

.landing-quote {
  font-family: "Oswald", "Arial Narrow", sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.15;
  text-transform: uppercase;
}

.feature-card,
.video-card {
  height: 100%;
}

.feature-card .card-body,
.video-card .card-body {
  padding: 1.5rem;
}

.video-list-panel,
.video-player-panel {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.video-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.video-list-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.78);
  color: var(--text-main);
  text-decoration: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.video-list-item:hover,
.video-list-item-active {
  border-color: rgba(74, 163, 140, 0.38);
  background: linear-gradient(135deg, rgba(223, 245, 255, 0.95), rgba(217, 244, 234, 0.95));
  transform: translateY(-1px);
}

.video-list-index {
  font-family: "Oswald", "Arial Narrow", sans-serif;
  color: var(--accent-dark);
  font-size: 1.1rem;
  font-weight: 700;
}

.video-list-title,
.video-list-description {
  display: block;
}

.video-list-title {
  font-weight: 800;
}

.video-list-description {
  margin-top: 0.3rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.video-embed {
  position: relative;
  overflow: hidden;
  border-radius: 1.15rem;
  background: #111827;
  aspect-ratio: 16 / 9;
}

.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-empty-state {
  display: flex;
  min-height: 320px;
  flex-direction: column;
  justify-content: center;
  border: 1px dashed rgba(74, 163, 140, 0.32);
  border-radius: 1.15rem;
  padding: 2rem;
  text-align: center;
}

.about-kfs-list {
  display: grid;
  gap: 0.75rem;
  padding-left: 1.1rem;
  line-height: 1.55;
}

.catalog-layout {
  display: grid;
  grid-template-columns: minmax(220px, 0.32fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}

.catalog-sidebar {
  position: sticky;
  top: 6rem;
  max-height: calc(100vh - 7rem);
}

.catalog-nav,
.catalog-category {
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.catalog-nav {
  display: flex;
  max-height: calc(100vh - 7rem);
  flex-direction: column;
  padding: 1.25rem;
  overflow: hidden;
}

.catalog-nav-list,
.catalog-content {
  display: flex;
  flex-direction: column;
  gap: 0rem;
}

.catalog-content {
  gap: 1.5rem;
}

.catalog-nav-list {
  min-height: 0;
  overflow-y: auto;
  padding-right: 0.35rem;
}

.catalog-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.15rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.72);
  color: var(--text-main);
  font-weight: 800;
  font-size: 0.92rem;
  line-height: 1.25;
  text-decoration: none;
}

.catalog-nav-link:hover,
.catalog-nav-link:focus,
.catalog-nav-link-active {
  border-color: rgba(74, 163, 140, 0.38);
  background: linear-gradient(135deg, rgba(223, 245, 255, 0.95), rgba(217, 244, 234, 0.95));
  color: var(--accent-dark);
}

.catalog-nav-count {
  display: inline-flex;
  min-width: 1.85rem;
  height: 1.85rem;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(74, 163, 140, 0.12);
  color: var(--accent-dark);
  font-size: 0.8rem;
}

.catalog-category {
  padding: 1.5rem;
  scroll-margin-top: 6rem;
}

.stat-chip {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.85rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.76);
  color: var(--text-main);
  font-weight: 700;
}

.stat-chip-strong {
  width: 100%;
  background: var(--surface-strong);
}

.stat-chip strong {
  font-family: "Oswald", "Arial Narrow", sans-serif;
  font-size: 1.8rem;
  color: var(--accent-dark);
}

.section-link {
  color: var(--accent-dark);
  text-decoration: none;
}

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

.landing-section-link {
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  background: linear-gradient(135deg, rgba(223, 245, 255, 0.95), rgba(217, 244, 234, 0.95));
  font-weight: 700;
}

.benefit-card {
  height: 100%;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 1.3rem;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.benefit-card-kfs {
  position: relative;
  overflow: hidden;
  padding: 1.6rem;
  height: auto !important;
  border: 1px solid rgba(62, 112, 154, 0.22);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(241, 248, 255, 0.96)),
    #ffffff;
  box-shadow:
    0 18px 40px rgba(45, 78, 120, 0.12),
    0 2px 10px rgba(45, 78, 120, 0.06);
}

.benefit-card-head {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.benefit-card-layout {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  min-height: 0;
}

.benefit-icon-column {
  display: flex;
  width: 4.75rem;
  min-width: 4.75rem;
  align-items: flex-start;
  justify-content: center;
  align-self: flex-start;
  padding-top: 0.2rem;
}

.benefit-copy-column {
  flex: 1 1 auto;
  min-width: 0;
}

.benefit-check {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  flex: 0 0 2rem;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: linear-gradient(135deg, #68b7cb, #4aa38c);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1;
  box-shadow: 0 10px 24px rgba(74, 163, 140, 0.22);
}

.benefit-check-lg {
  width: 4rem;
  height: 4rem;
  flex-basis: 4rem;
  font-size: 1.7rem;
  box-shadow:
    0 16px 30px rgba(74, 163, 140, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.landing-benefits-kfs .benefit-card h3 {
  color: #143d69;
  line-height: 1.15;
}

.landing-benefits-kfs .benefit-card .text-secondary {
  color: #496581 !important;
}

.landing-benefits-kfs .benefit-card:hover {
  transform: translateY(-2px);
  box-shadow:
    0 24px 48px rgba(45, 78, 120, 0.15),
    0 4px 14px rgba(45, 78, 120, 0.08);
}

.feature-card-dark {
  background: linear-gradient(135deg, #68b7cb, #4aa38c);
  color: #ffffff;
}

.feature-card-dark .text-secondary {
  color: rgba(255, 255, 255, 0.72) !important;
}

.feature-card-accent {
  background: linear-gradient(135deg, #d9f4ea, #dff5ff);
  color: var(--text-main);
}

.btn-primary {
  --bs-btn-bg: #4aa38c;
  --bs-btn-border-color: #4aa38c;
  --bs-btn-color: #ffffff;
  --bs-btn-hover-bg: #3b907a;
  --bs-btn-hover-border-color: #3b907a;
  --bs-btn-hover-color: #ffffff;
  --bs-btn-active-bg: #347d69;
  --bs-btn-active-border-color: #347d69;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.btn-outline-primary {
  --bs-btn-color: var(--accent-dark);
  --bs-btn-border-color: rgba(74, 163, 140, 0.3);
  --bs-btn-hover-bg: #4aa38c;
  --bs-btn-hover-border-color: #4aa38c;
  --bs-btn-hover-color: #fff;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.placeholder-image {
  min-height: 320px;
  color: var(--text-muted);
}

.kfs-order-badge {
  display: inline-flex;
  min-width: 3rem;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: linear-gradient(135deg, rgba(223, 245, 255, 0.95), rgba(217, 244, 234, 0.95));
  color: var(--accent-dark);
  font-size: 1.1rem;
  font-weight: 700;
}

@media (max-width: 767.98px) {
  html {
    scroll-padding-top: 5.25rem;
  }

  .site-nav {
    padding: 0.5rem 0 0.25rem;
  }

  .site-nav-link {
    width: 100%;
    border-radius: 0.9rem;
  }

  .hero-block {
    padding: 1.5rem;
  }

  .landing-title {
    font-size: clamp(2.25rem, 12vw, 3.35rem);
    line-height: 1.02;
  }

  .hero-block.hero-landing {
    padding: 2rem;
  }

  .catalog-layout {
    grid-template-columns: 1fr;
  }

  .catalog-sidebar {
    position: static;
  }

  .catalog-nav-list {
    max-height: 45vh;
    overflow-y: auto;
  }

  .catalog-category {
    padding: 1.25rem;
    scroll-margin-top: 5.25rem;
  }

  .benefit-card-layout {
    gap: 0.9rem;
  }

  .benefit-icon-column {
    width: 4rem;
    min-width: 4rem;
  }

  .benefit-check-lg {
    width: 3.25rem;
    height: 3.25rem;
    flex-basis: 3.25rem;
    font-size: 1.35rem;
  }
}