/* Masterdoc landing — pairio-inspired layout, Russian copy */

:root {
  --primary: #1a1a1a;
  --secondary: #333333;
  --dark: #0f172a;
  --text: #000000;
  --gray: #888888;
  --light: #f5f5f5;
  --white: #ffffff;
  --border: rgba(0, 0, 0, 0.12);
  --shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
  --radius: 8px;
  --container: 1200px;
  --header-h: 80px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text);
  overflow-x: hidden;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  position: fixed;
  left: 1rem;
  top: 1rem;
  z-index: 2000;
  width: auto;
  height: auto;
  padding: 0.75rem 1rem;
  background: var(--dark);
  color: #fff;
  border-radius: var(--radius);
}

/* Header */
.site-header {
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.nav {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.logo img {
  display: block;
  flex-shrink: 0;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.nav-actions .cta-button {
  padding: 0.75rem 1.5rem;
  background: var(--text);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  font-size: 0.9rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}

.nav-actions .cta-button:hover {
  background: var(--secondary);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 3px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
    margin-left: auto;
  }

  .nav-links {
    position: fixed;
    top: var(--header-h);
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    flex-direction: column;
    padding: 1.5rem 2rem 2rem;
    gap: 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    align-items: stretch;
  }

  .nav-links.is-open {
    transform: translateX(0);
  }

  .nav-links li {
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
  }

  .nav-links a {
    display: block;
    padding: 1rem 0;
    font-size: 1.05rem;
  }

  .nav-actions {
    display: none;
  }
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--white);
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + 2rem) 1.5rem 4rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.hero-bg::before,
.hero-bg::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.hero-bg::before {
  width: 500px;
  height: 500px;
  background: rgba(0, 0, 0, 0.02);
  top: -250px;
  right: -250px;
  animation: float 20s infinite ease-in-out;
}

.hero-bg::after {
  width: 400px;
  height: 400px;
  background: rgba(0, 0, 0, 0.015);
  bottom: -200px;
  left: -200px;
  animation: float 15s infinite ease-in-out reverse;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0);
  }
  50% {
    transform: translateY(-20px) rotate(10deg);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  text-align: center;
  width: 100%;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 1.5rem;
  color: var(--text);
}

.hero-lead {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--gray);
  margin: 0 auto 2.5rem;
  max-width: 52rem;
  line-height: 1.75;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

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

.btn-primary:hover {
  background: var(--secondary);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

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

.btn-secondary:hover {
  background: rgba(0, 0, 0, 0.04);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

/* Sections */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 2rem;
}

.container-narrow {
  max-width: 720px;
}

.section {
  padding: 5rem 0;
}

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

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  margin: 0 0 0.75rem;
  text-align: center;
}

.section-intro {
  text-align: center;
  color: var(--gray);
  max-width: 42rem;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
}

.section-eyebrow {
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray);
  margin: 0 0 0.5rem;
}

.section-title + .section-intro,
.section-eyebrow + .section-title {
  margin-top: 0;
}

.section-eyebrow + .section-title {
  margin-bottom: 2.5rem;
}

#testimonials .section-title {
  margin-bottom: 2.5rem;
}

/* Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}

.testimonial-card {
  margin: 0;
  padding: 1.75rem;
  background: var(--white);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.04);
}

.testimonial-card p {
  margin: 0 0 1rem;
  font-size: 0.98rem;
  line-height: 1.65;
  color: var(--secondary);
}

.testimonial-card footer {
  font-size: 0.88rem;
  color: var(--gray);
  font-style: normal;
}

@media (max-width: 900px) {
  .testimonials-grid {
    grid-template-columns: 1fr;
  }
}

.challenge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.challenge-card {
  background: var(--white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--border);
}

.challenge-card-wide {
  grid-column: 1 / -1;
}

.challenge-num {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gray);
  margin-bottom: 1rem;
}

.challenge-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  font-weight: 600;
}

.challenge-card h3:last-child {
  margin-bottom: 0;
}

.challenge-card p {
  margin: 0;
  color: var(--secondary);
  font-size: 0.95rem;
}

@media (max-width: 700px) {
  .challenge-grid {
    grid-template-columns: 1fr;
  }

  .challenge-card-wide {
    grid-column: auto;
  }
}

/* Solution */
.solution-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.solution-item {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.solution-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.solution-item h3 {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
}

.solution-item p {
  margin: 0;
  color: var(--secondary);
}

/* Benefits */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.benefit-card {
  background: var(--white);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  border: 1px solid var(--border);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.04);
}

.benefit-stat {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text);
  line-height: 1.2;
}

.benefit-label {
  margin: 0;
  font-size: 0.9rem;
  color: var(--secondary);
}

@media (max-width: 900px) {
  .benefits-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .benefits-grid {
    grid-template-columns: 1fr;
  }
}

/* FAQ */
.faq {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0 1rem;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  padding: 1rem 0;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  font-weight: 400;
  color: var(--gray);
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  margin: 0 0 1rem;
  color: var(--secondary);
  font-size: 0.95rem;
}

.faq-item a {
  color: var(--text);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.faq-item a:hover {
  text-decoration-thickness: 2px;
}

/* Contact */
.section-contact {
  background: var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-copy h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

.contact-copy > p {
  margin: 0 0 2rem;
  color: var(--secondary);
}

.contact-person {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.contact-person img {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
}

.contact-name {
  font-weight: 700;
  font-size: 1.1rem;
}

.contact-role {
  color: var(--gray);
  font-size: 0.95rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 500;
}

.form-field input,
.form-field textarea {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  color: var(--text);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: 2px solid rgba(0, 0, 0, 0.15);
  outline-offset: 1px;
}

.req {
  color: #b91c1c;
}

.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
}

@media (max-width: 900px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* Footer */
.site-footer {
  background: var(--dark);
  color: #fff;
  padding: 4rem 2rem 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.logo-footer img {
  filter: invert(1);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
  font-size: 0.95rem;
}

.footer-section h4 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section li {
  margin-bottom: 0.6rem;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
}

.footer-section a:hover {
  color: #fff;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.9rem;
}

.footer-bottom a {
  color: rgba(255, 255, 255, 0.9);
}

.footer-bottom p {
  margin: 0.35rem 0;
}

.footer-copy {
  font-size: 0.85rem;
}