:root {
  --color-bg: #ffffff;
  --color-text: #1f2933;
  --color-muted: #5b6b7a;
  --color-line: #e5e9ef;
  --color-card: #f7f9fc;
  --color-accent: #0b5fa5;
  --color-accent-dark: #084b82;
  --shadow-soft: 0 6px 16px rgba(15, 23, 42, 0.08);
  --radius: 10px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  color: var(--color-text);
  background: linear-gradient(180deg, #ffffff 0%, #fbfcfe 55%, #ffffff 100%);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(11, 95, 165, 0.4);
  outline-offset: 2px;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: blur(6px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) 0;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.logo img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-text);
}

.lang-toggle {
  display: inline-flex;
  gap: var(--space-2);
  border: 1px solid var(--color-line);
  border-radius: 999px;
  padding: 2px;
}

.lang-toggle button {
  border: none;
  background: transparent;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.lang-toggle button[aria-pressed="true"] {
  background: var(--color-accent);
  color: #ffffff;
}

.hero {
  padding: var(--space-7) 0 var(--space-6);
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 var(--space-3);
}

.hero p {
  max-width: 740px;
  color: var(--color-muted);
}

.hero .cta {
  margin-top: var(--space-5);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: 6px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.section {
  padding: var(--space-6) 0;
}

.section-title {
  font-size: 1.5rem;
  margin: 0 0 var(--space-4);
}

.doc-slider {
  position: relative;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: var(--space-5) 0;
  --doc-gap: var(--space-4);
}

.doc-controls {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.doc-viewport {
  overflow: hidden;
}

.doc-track {
  display: flex;
  gap: var(--doc-gap);
  will-change: transform;
  transition: transform 0.5s ease;
}

.doc-card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: var(--space-4);
  width: var(--slide-width, 100%);
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.doc-title {
  font-weight: 600;
  font-size: 1.05rem;
}

.doc-meta {
  font-size: 0.85rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.doc-desc {
  color: var(--color-muted);
  min-height: 3.2em;
}

.contact-block {
  background: #ffffff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow-soft);
}

.contact-block p {
  margin: 0 0 var(--space-2);
  color: var(--color-muted);
}

.site-footer {
  border-top: 1px solid var(--color-line);
  padding: var(--space-5) 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.content-block {
  background: #ffffff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: var(--space-5);
  box-shadow: var(--shadow-soft);
  margin-bottom: var(--space-5);
}

.content-block h2 {
  margin-top: 0;
}

@media (max-width: 900px) {
  .nav-links {
    justify-content: flex-start;
  }
}

@media (max-width: 700px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
    gap: var(--space-3);
  }

  .hero {
    padding-top: var(--space-6);
  }
}

@media (max-width: 520px) {
  .container {
    padding: 0 var(--space-4);
  }

  .doc-controls {
    justify-content: flex-start;
  }
}