/* ========== Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --accent-gradient: linear-gradient(135deg, #2563eb, #7c3aed);
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --container: 1120px;
  --header-h: 64px;
}
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 12px;
}
.section-desc {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto 48px;
}

/* ========== Header ========== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
}
.logo-text { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav { display: flex; gap: 32px; }
.nav-link {
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color .2s;
}
.nav-link:hover { color: var(--accent); }

/* ========== Mobile Menu Toggle ========== */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .2s;
}

/* ========== Hero ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--header-h) + 40px) 24px 80px;
  background: linear-gradient(180deg, var(--accent-light) 0%, var(--bg) 60%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 50% 40%, rgba(37,99,235,.06) 0%, transparent 60%);
  pointer-events: none;
}
.hero-content { position: relative; max-width: 720px; }
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}
.hero-actions { margin-bottom: 40px; }
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}
.hero-stats .stat {
  font-size: .9rem;
  color: var(--text-secondary);
}
.hero-stats .stat strong {
  display: block;
  font-size: 1.4rem;
  color: var(--text);
  margin-bottom: 2px;
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: inherit;
  font-size: .95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all .2s;
}
.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 2px 8px rgba(37,99,235,.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 4px 14px rgba(37,99,235,.35); }
.btn-lg { padding: 14px 36px; font-size: 1.05rem; border-radius: var(--radius); }

/* ========== Brands ========== */
.brands-section { background: var(--bg); }
.brands-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}
.brand-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all .2s;
  text-align: center;
}
.brand-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); transform: translateY(-2px); }
.brand-icon {
  width: 36px;
  height: 36px;
  color: var(--accent);
}
.brand-name { font-weight: 700; font-size: .9rem; }
.brand-models { font-size: .75rem; color: var(--text-muted); line-height: 1.3; }

/* ========== Features ========== */
.why-section { background: var(--bg-alt); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 24px;
}
.feature-card {
  padding: 32px 24px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all .2s;
}
.feature-card:hover { box-shadow: var(--shadow-md); }
.feature-icon {
  width: 28px;
  height: 28px;
  color: var(--accent);
  margin-bottom: 16px;
}
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: .9rem; color: var(--text-secondary); line-height: 1.6; }

/* ========== FAQ ========== */
.faq-section { background: var(--bg); }
.faq-list { max-width: 700px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color .2s;
}
.faq-item[open] { border-color: var(--accent); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after {
  content: '+';
  font-size: 1.3rem;
  color: var(--text-muted);
  transition: transform .2s;
}
.faq-item[open] .faq-question::after { transform: rotate(45deg); }
.faq-answer {
  padding: 0 24px 18px;
  font-size: .9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========== Reviews ========== */
.reviews-section { background: var(--bg-alt); }
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.review-card {
  padding: 28px 24px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.review-stars { color: #f59e0b; font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: .9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-author { font-weight: 600; font-size: .85rem; }

/* ========== Contact ========== */
.contact-section { background: var(--bg); }
.contact-content { max-width: 500px; margin: 0 auto; }
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  font-size: .9rem;
  color: var(--text-secondary);
}
.contact-item svg { color: var(--accent); flex-shrink: 0; }

/* ========== Footer ========== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
}
.footer-links, .footer-legal {
  display: flex;
  gap: 24px;
  font-size: .85rem;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a, .footer-legal a { color: var(--text-secondary); transition: color .2s; }
.footer-links a:hover, .footer-legal a:hover { color: var(--accent); }
.footer-copy { font-size: .8rem; color: var(--text-muted); }

/* ========== Mobile Menu Overlay ========== */
.mobile-menu {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--bg);
  z-index: 200;
  display: flex;
  flex-direction: column;
  padding: 20px 24px;
  transform: translateX(100%);
  transition: transform .3s ease;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 40px;
}
.close-btn {
  font-size: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text);
  line-height: 1;
}
.mobile-nav { display: flex; flex-direction: column; gap: 20px; }
.mobile-nav-link {
  font-size: 1.15rem;
  font-weight: 600;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav { display: none; }
  .menu-toggle { display: flex; }
  .hero-title { font-size: clamp(1.8rem, 6vw, 2.5rem); }
  .hero-stats { gap: 24px; }
  .brands-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .features-grid { grid-template-columns: 1fr; }
  .section { padding: 60px 0; }
  .faq-question { padding: 14px 18px; font-size: .9rem; }
}
@media (max-width: 480px) {
  .brands-grid { grid-template-columns: repeat(2, 1fr); }
  .brand-card { padding: 16px 12px; }
  .review-card { padding: 20px 16px; }
}