/* QuickPack — тёмная тема, полировка hover/focus/transition */

:root {
  --color-bg: #0f1115;
  --color-bg-elevated: #161a21;
  --color-bg-card: #1c2129;
  --color-text: #f0f2f5;
  --color-text-muted: #9ca3af;
  --color-text-dim: #6b7280;
  --color-accent: #3b82f6;
  --color-accent-hover: #60a5fa;
  --color-accent-active: #2563eb;
  --color-border: #2d3548;
  --color-border-hover: #3d4556;
  --font: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.35);
  --transition: 0.2s ease;
  --transition-slow: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 21, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.logo {
  display: inline-block;
  transition: opacity var(--transition), transform var(--transition);
}

.logo:hover {
  opacity: 0.9;
}

.logo:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.logo img {
  display: block;
  height: 40px;
  width: auto;
  object-fit: contain;
}

.header-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  padding: 6px 0;
  position: relative;
  transition: color var(--transition);
}

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

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

.nav a:hover::after {
  width: 100%;
}

.nav a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.header-cta {
  display: flex;
  gap: 12px;
}

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.burger:hover {
  background: var(--color-bg-card);
}

.burger:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.burger span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Buttons — полировка */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent-hover);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.btn-primary:active {
  transform: translateY(0);
  background: var(--color-accent-active);
  border-color: var(--color-accent-active);
}

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

.btn-outline:hover {
  border-color: var(--color-border-hover);
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.04);
  transform: translateY(-1px);
}

.btn-outline:active {
  transform: translateY(0);
  background: rgba(255, 255, 255, 0.08);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

/* Hero */
.hero {
  padding: 80px 0 88px;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  margin-bottom: 24px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: border-color var(--transition), color var(--transition);
}

.hero-badge:hover {
  border-color: var(--color-border-hover);
  color: var(--color-text);
}

.hero-title {
  margin: 0 0 24px;
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  max-width: 640px;
  margin: 0 auto 40px;
  font-size: 18px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* Sections common */
.section {
  padding: 72px 0;
}

.section-title {
  margin: 0 0 12px;
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
}

.section-lead {
  max-width: 560px;
  margin: 0 auto 40px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.6;
}

/* About */
.section-about {
  background: var(--color-bg-elevated);
}

.about-block {
  max-width: 680px;
  margin: 0 auto;
}

.about-lead {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 16px;
}

.about-block p {
  margin: 0 0 16px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.about-block p:last-child {
  margin-bottom: 0;
}

/* Features */
.section-features {
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

@media (max-width: 620px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature-card {
  padding: 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition);
}

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

.feature-card:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
}

.feature-card h3 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.feature-card p {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* Why */
.section-why {
  background: var(--color-bg-elevated);
}

.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.why-card {
  padding: 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: transform var(--transition-slow), border-color var(--transition), box-shadow var(--transition);
}

.why-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow);
}

.why-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  margin-bottom: 16px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-accent);
  font-weight: 700;
  font-size: 16px;
  border-radius: var(--radius-sm);
  transition: background var(--transition), transform var(--transition);
}

.why-card:hover .why-icon {
  background: rgba(59, 130, 246, 0.25);
  transform: scale(1.05);
}

.why-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
}

.why-card p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* Steps */
.section-steps {
  background: var(--color-bg);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

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

@media (max-width: 500px) {
  .steps {
    grid-template-columns: 1fr;
  }
}

.step {
  padding: 28px 0;
  border-top: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) 0 0;
  transition: border-color var(--transition), background var(--transition);
}

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

.step-num {
  display: block;
  margin-bottom: 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.step h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.step p {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* Audience */
.section-audience {
  background: var(--color-bg-elevated);
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

@media (max-width: 768px) {
  .audience-grid {
    grid-template-columns: 1fr;
  }
}

.audience-card {
  padding: 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: transform var(--transition-slow), border-color var(--transition), box-shadow var(--transition);
}

.audience-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow);
}

.audience-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text);
}

.audience-card p {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* Guarantee */
.section-guarantee {
  background: var(--color-bg);
}

.guarantee-list {
  max-width: 560px;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.guarantee-list li {
  position: relative;
  padding: 12px 0 12px 32px;
  color: var(--color-text-muted);
  line-height: 1.55;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition);
}

.guarantee-list li:last-child {
  border-bottom: none;
}

.guarantee-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 16px;
}

.guarantee-list li:hover {
  color: var(--color-text);
}

/* CTA mid */
.section-cta-mid {
  padding: 64px 0;
  background: var(--color-bg-elevated);
  text-align: center;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cta-mid-text {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
}

.cta-mid-sub {
  margin: 0 0 28px;
  font-size: 16px;
  color: var(--color-text-muted);
}

.cta-mid-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* FAQ */
.section-faq {
  background: var(--color-bg);
}

.faq-list {
  max-width: 640px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}

.faq-item:hover {
  background: rgba(255, 255, 255, 0.02);
}

.faq-item summary {
  position: relative;
  padding: 20px 36px 20px 0;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text);
  transition: color var(--transition);
}

.faq-item summary:hover {
  color: var(--color-accent-hover);
}

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

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 0;
  font-size: 22px;
  font-weight: 400;
  color: var(--color-text-muted);
  transition: transform var(--transition), color var(--transition);
}

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

.faq-item summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.faq-item p {
  margin: 0 0 20px;
  padding: 0 0 20px;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Contact */
.section-contact {
  padding: 80px 0;
  background: var(--color-bg-elevated);
  text-align: center;
}

.contact-lead {
  margin: 0 0 24px;
  font-size: 18px;
  color: var(--color-text-muted);
}

.contact-info {
  max-width: 400px;
  margin: 0 auto 32px;
  text-align: left;
  padding: 24px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.contact-info p {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--color-text-muted);
}

.contact-info p:last-child {
  margin-bottom: 0;
}

.contact-info a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition), text-decoration var(--transition);
}

.contact-info a:hover {
  color: var(--color-accent-hover);
  text-decoration: underline;
}

.contact-info a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.contact-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* Blog */
.section-blog {
  background: var(--color-bg);
  padding-bottom: 80px;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

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

@media (max-width: 560px) {
  .blog-grid {
    grid-template-columns: 1fr;
  }
}

.blog-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition-slow), border-color var(--transition), box-shadow var(--transition);
}

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

.blog-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

.blog-card-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.blog-card-image {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg-elevated);
}

.blog-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.blog-card:hover .blog-card-image img {
  transform: scale(1.03);
}

.blog-card-body {
  padding: 20px;
}

.blog-card-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--color-text);
  transition: color var(--transition);
}

.blog-card-link:hover .blog-card-title {
  color: var(--color-accent-hover);
}

.blog-card-desc {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Footer */
.footer {
  background: var(--color-bg-card);
  color: var(--color-text-muted);
  font-size: 14px;
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  padding: 40px 24px 24px;
}

.footer-brand img {
  height: 28px;
  width: auto;
  opacity: 0.95;
  margin-bottom: 8px;
  display: block;
}

.footer-brand p {
  margin: 0;
  font-size: 13px;
  color: var(--color-text-dim);
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-links a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
}

.footer-bottom .container {
  padding: 16px 24px;
}

.footer-bottom p {
  margin: 0;
  font-size: 13px;
  color: var(--color-text-dim);
}

/* Mobile */
@media (max-width: 768px) {
  .header-menu {
    display: none;
  }

  .burger {
    display: flex;
  }

  .header.open .header-menu {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 24px;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    gap: 20px;
  }

  .header.open .nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .header.open .nav a::after {
    display: none;
  }

  .header.open .header-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding-top: 8px;
    border-top: 1px solid var(--color-border);
  }

  .hero {
    padding: 56px 0 64px;
  }

  .section {
    padding: 56px 0;
  }

  .hero-cta,
  .cta-mid-buttons,
  .contact-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn-lg {
    width: 100%;
    max-width: 280px;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .contact-info {
    text-align: center;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .btn:hover,
  .feature-card:hover,
  .why-card:hover,
  .audience-card:hover {
    transform: none;
  }
}