/* ============================================================
   Digital Advance — style.css
   Dark navy corporate theme, blue accent #2563EB
   Font: Onest (fallback Montserrat, sans-serif)
   ============================================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-card: #1E293B;
  --bg-card-hover: #253349;
  --accent: #2563EB;
  --accent-light: #3B82F6;
  --accent-glow: rgba(37, 99, 235, .25);
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --border: rgba(148, 163, 184, .12);
  --radius: 12px;
  --nav-height: 72px;
  --container: 1200px;
  --transition: .3s ease;
  --font: 'Onest', 'Montserrat', system-ui, -apple-system, sans-serif;
}

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: var(--accent-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: #60A5FA; }

img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 { font-weight: 800; line-height: 1.2; color: var(--text-primary); }
h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); letter-spacing: -.015em; }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 620px;
  margin: 12px auto 0;
  text-align: center;
}

.blue-gradient {
  background: linear-gradient(135deg, var(--accent), #60A5FA);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(15, 23, 42, .78);
  backdrop-filter: blur(18px) saturate(1.6);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -.02em;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: .925rem;
  font-weight: 500;
  transition: color var(--transition);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text-primary); }

.nav-cta {
  background: var(--accent) !important;
  color: #fff !important;
  padding: 10px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: .9rem !important;
  transition: background var(--transition), transform var(--transition) !important;
}
.nav-cta:hover { background: var(--accent-light) !important; transform: translateY(-1px); }

/* Burger */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
  z-index: 1010;
}
.burger span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.burger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ---------- Sections ---------- */
section { padding: 100px 0; }
.bg-alt { background: var(--bg-secondary); }

/* ---------- Hero ---------- */
.hero {
  padding-top: calc(var(--nav-height) + 80px);
  padding-bottom: 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%; left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(37, 99, 235, .12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: .04em;
  margin-bottom: 24px;
  padding: 6px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(30, 41, 59, .6);
}

.hero h1 { margin-bottom: 24px; }

.hero-text {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.hero-trust {
  display: flex;
  gap: 36px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: .95rem;
  color: var(--text-muted);
}

.hero-trust span { white-space: nowrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 24px rgba(37, 99, 235, .3);
}
.btn-primary:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(37, 99, 235, .4);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  transform: translateY(-2px);
}

/* ---------- Stats ---------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.stat-card:hover {
  border-color: rgba(37, 99, 235, .35);
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.stat-desc {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ---------- Services Grid ---------- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 30px;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.service-card:hover {
  border-color: rgba(37, 99, 235, .35);
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-4px);
}

.service-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, .12);
  border-radius: 12px;
  margin-bottom: 20px;
  color: var(--accent-light);
}
.service-icon svg { width: 26px; height: 26px; }

.service-card h3 { margin-bottom: 10px; font-size: 1.2rem; }

.service-card p {
  color: var(--text-secondary);
  font-size: .95rem;
  line-height: 1.6;
}

/* ---------- Cases / Portfolio ---------- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 30px;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  display: flex;
  flex-direction: column;
}
.case-card:hover {
  border-color: rgba(37, 99, 235, .35);
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-4px);
}

.case-tag {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--accent-light);
  background: rgba(37, 99, 235, .12);
  padding: 4px 12px;
  border-radius: 6px;
  margin-bottom: 16px;
  align-self: flex-start;
}

.case-card h3 { margin-bottom: 6px; }

.case-city {
  font-size: .88rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.case-card p {
  color: var(--text-secondary);
  font-size: .95rem;
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}

.case-results {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.case-result {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: .9rem;
  color: var(--text-secondary);
}

.case-result .result-value {
  font-weight: 700;
  color: var(--accent-light);
  min-width: 80px;
}

/* ---------- CTA Banner ---------- */
.cta-section {
  padding: 80px 0;
}

.cta-box {
  background: var(--bg-card);
  border: 1.5px solid transparent;
  border-image: linear-gradient(135deg, var(--accent), #60A5FA, var(--accent)) 1;
  border-radius: 0;
  padding: 56px 48px;
  text-align: center;
  position: relative;
}

/* Rounded border workaround (border-image breaks border-radius) */
.cta-box-wrapper {
  position: relative;
  border-radius: var(--radius);
  padding: 2px;
  background: linear-gradient(135deg, var(--accent), #60A5FA, var(--accent));
}

.cta-box {
  background: var(--bg-secondary);
  border: none;
  border-radius: 10px;
  padding: 56px 48px;
  text-align: center;
}

.cta-box h2 { margin-bottom: 16px; }

.cta-box p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.cta-contacts {
  display: flex;
  gap: 28px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 20px 0 32px;
  font-size: .95rem;
}

.cta-contacts a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
}
.cta-contacts a:hover { color: var(--accent-light); }

/* ---------- Footer ---------- */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 60px 0 36px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: .9rem;
  margin-top: 10px;
  line-height: 1.6;
  max-width: 280px;
}

.footer-col h4 {
  font-size: .95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-col ul { display: flex; flex-direction: column; gap: 10px; }

.footer-col a {
  color: var(--text-muted);
  font-size: .9rem;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--text-primary); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: .85rem;
  color: var(--text-muted);
}

/* ---------- About Page: Hero Small ---------- */
.hero-small {
  padding-top: calc(var(--nav-height) + 60px);
  padding-bottom: 60px;
  text-align: center;
  position: relative;
}

.hero-small::before {
  content: '';
  position: absolute;
  top: -30%; left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 99, 235, .1) 0%, transparent 70%);
  pointer-events: none;
}

.hero-small h1 { margin-bottom: 16px; }

.hero-small p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- About Content ---------- */
.about-text {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about-text p + p { margin-top: 20px; }

/* ---------- Team ---------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.team-card:hover {
  border-color: rgba(37, 99, 235, .35);
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-4px);
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #60A5FA);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.8rem;
  font-weight: 800;
  color: #fff;
}

.team-card h3 { font-size: 1.1rem; margin-bottom: 6px; }

.team-role {
  font-size: .88rem;
  color: var(--accent-light);
  font-weight: 600;
  margin-bottom: 12px;
}

.team-card p {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ---------- Why Us (10 reasons) ---------- */
.reasons-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.reason-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 28px;
  display: flex;
  gap: 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.reason-card:hover {
  border-color: rgba(37, 99, 235, .3);
  box-shadow: 0 0 24px var(--accent-glow);
}

.reason-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  min-width: 48px;
}

.reason-content h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.reason-content p {
  font-size: .9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ---------- Process Steps ---------- */
.process-steps {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), var(--accent-light), var(--accent));
  transform: translateX(-50%);
}

.process-step {
  display: flex;
  align-items: center;
  gap: 40px;
  position: relative;
  padding: 28px 0;
}

.process-step:nth-child(odd) { flex-direction: row; }
.process-step:nth-child(even) { flex-direction: row-reverse; }

.process-step-content {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 30px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.process-step:nth-child(odd) .process-step-content { text-align: right; }
.process-step:nth-child(even) .process-step-content { text-align: left; }

.process-step-content:hover {
  border-color: rgba(37, 99, 235, .3);
  box-shadow: 0 0 24px var(--accent-glow);
}

.process-step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
  position: relative;
  z-index: 2;
  box-shadow: 0 0 20px var(--accent-glow);
}

.process-spacer { flex: 1; }

.process-step-content h3 { margin-bottom: 6px; font-size: 1.1rem; }
.process-step-content p { font-size: .9rem; color: var(--text-muted); line-height: 1.55; }

/* ---------- Bonuses ---------- */
.bonuses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.bonus-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.bonus-card:hover {
  border-color: rgba(37, 99, 235, .35);
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-4px);
}

.bonus-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, .12);
  border-radius: 12px;
  margin: 0 auto 16px;
  color: var(--accent-light);
}
.bonus-icon svg { width: 24px; height: 24px; }

.bonus-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.bonus-card p { font-size: .88rem; color: var(--text-muted); line-height: 1.55; }

/* ---------- FAQ Accordion ---------- */
.faq-category {
  margin-bottom: 40px;
}

.faq-category h3 {
  font-size: 1.2rem;
  margin-bottom: 16px;
  color: var(--accent-light);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item:hover { border-color: rgba(37, 99, 235, .25); }

.faq-question {
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  padding: 20px 24px;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color var(--transition);
}
.faq-question:hover { color: var(--accent-light); }

.faq-question .faq-chevron {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: transform var(--transition), color var(--transition);
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-light);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .4s ease, padding .3s ease;
}

.faq-item.active .faq-answer {
  max-height: 400px;
}

.faq-answer-inner {
  padding: 0 24px 20px;
  color: var(--text-secondary);
  font-size: .95rem;
  line-height: 1.7;
}

/* ---------- Section Headers ---------- */
.section-header {
  text-align: center;
  margin-bottom: 12px;
}

/* ---------- Mobile Menu Overlay ---------- */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(15, 23, 42, .95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.mobile-overlay.active { display: flex; }

.mobile-overlay a {
  color: var(--text-primary);
  font-size: 1.3rem;
  font-weight: 600;
}
.mobile-overlay a:hover { color: var(--accent-light); }

/* ============================================================
   Responsive
   ============================================================ */

/* 1024px */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .reasons-grid { grid-template-columns: 1fr; }
  .bonuses-grid { grid-template-columns: repeat(2, 1fr); }
}

/* 768px */
@media (max-width: 768px) {
  :root { --nav-height: 64px; }

  .nav-links { display: none; }
  .burger { display: flex; }

  section { padding: 72px 0; }

  .hero { padding-top: calc(var(--nav-height) + 56px); padding-bottom: 72px; }
  .hero-small { padding-top: calc(var(--nav-height) + 44px); padding-bottom: 44px; }

  .hero-trust { gap: 20px; font-size: .88rem; }

  .services-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .bonuses-grid { grid-template-columns: 1fr; }

  .cta-box { padding: 40px 28px; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }

  /* Process: stack vertically */
  .process-steps::before { left: 24px; }
  .process-step,
  .process-step:nth-child(odd),
  .process-step:nth-child(even) {
    flex-direction: row;
    gap: 20px;
  }
  .process-step:nth-child(odd) .process-step-content,
  .process-step:nth-child(even) .process-step-content {
    text-align: left;
  }
  .process-spacer { display: none; }
  .process-step-number { width: 40px; height: 40px; font-size: 1rem; }
}

/* 480px */
@media (max-width: 480px) {
  .container { padding: 0 16px; }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }

  .stats-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: 1fr; }

  .hero-buttons { flex-direction: column; align-items: center; }
  .hero-buttons .btn { width: 100%; justify-content: center; }

  .stat-number { font-size: 2.2rem; }

  .cta-contacts { flex-direction: column; gap: 12px; }
}