/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
  color: #1A1A2E; background: #fff; line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,0.97); border-bottom: 1px solid #e5e7eb;
  backdrop-filter: blur(8px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 20px; height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.35rem; color: #2563EB; }
.logo-icon {
  width: 36px; height: 36px; background: linear-gradient(135deg, #2563EB, #06b6d4);
  border-radius: 10px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 900; font-size: 1.1rem;
}
.main-nav { display: flex; align-items: center; gap: 32px; }
.main-nav a {
  font-size: 0.95rem; font-weight: 500; color: #4A4A6A;
  transition: color 0.2s;
}
.main-nav a:hover { color: #2563EB; }
.btn-download {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 24px; background: #2563EB; color: #fff !important;
  border-radius: 8px; font-weight: 600; font-size: 0.9rem;
  transition: background 0.2s, transform 0.15s;
}
.btn-download:hover { background: #1d4ed8; transform: translateY(-1px); }

/* Mobile menu toggle */
.menu-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.menu-toggle span { width: 24px; height: 2px; background: #1A1A2E; border-radius: 2px; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(160deg, #eff6ff 0%, #f0f9ff 40%, #fff 100%);
  padding: 80px 0 90px; text-align: center;
}
.hero h1 { font-size: 3rem; font-weight: 800; line-height: 1.2; margin-bottom: 20px; color: #0f172a; }
.hero h1 span { color: #2563EB; }
.hero .subtitle {
  font-size: 1.15rem; color: #4A4A6A; max-width: 640px; margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-stats {
  display: flex; justify-content: center; gap: 48px; margin-bottom: 40px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 2rem; font-weight: 800; color: #2563EB; }
.hero-stat .label { font-size: 0.85rem; color: #6b7280; margin-top: 4px; }
.hero-btns { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px; background: #2563EB; color: #fff;
  border-radius: 10px; font-weight: 700; font-size: 1.05rem;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}
.btn-primary:hover { background: #1d4ed8; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(37,99,235,0.4); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 36px; background: #fff; color: #2563EB;
  border: 2px solid #2563EB; border-radius: 10px;
  font-weight: 700; font-size: 1.05rem;
  transition: background 0.2s, transform 0.15s;
}
.btn-secondary:hover { background: #eff6ff; transform: translateY(-2px); }
.trust-badges {
  display: flex; justify-content: center; gap: 24px; margin-top: 32px; flex-wrap: wrap;
}
.trust-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; background: #f0fdf4; border: 1px solid #bbf7d0;
  border-radius: 20px; font-size: 0.8rem; color: #166534; font-weight: 500;
}

/* ===== Section Common ===== */
.section { padding: 80px 0; }
.section-alt { background: #f8fafc; }
.section-title {
  text-align: center; font-size: 2.2rem; font-weight: 800;
  margin-bottom: 16px; color: #0f172a;
}
.section-desc {
  text-align: center; font-size: 1.05rem; color: #6b7280;
  max-width: 600px; margin: 0 auto 50px;
}

/* ===== Feature Cards ===== */
.features-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feature-card {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 16px;
  padding: 36px 28px; text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
}
.feature-card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(0,0,0,0.08); }
.feature-icon {
  width: 64px; height: 64px; margin: 0 auto 20px;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border-radius: 16px; display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 0.9rem; color: #6b7280; line-height: 1.6; }

/* ===== Product Detail ===== */
.product-row {
  display: flex; align-items: center; gap: 60px; margin-bottom: 60px;
}
.product-row:nth-child(even) { flex-direction: row-reverse; }
.product-text { flex: 1; }
.product-text h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: 14px; color: #0f172a; }
.product-text p { font-size: 1rem; color: #4A4A6A; line-height: 1.8; margin-bottom: 12px; }
.product-visual {
  flex: 1; background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border-radius: 20px; padding: 40px; text-align: center;
  min-height: 260px; display: flex; align-items: center; justify-content: center;
  font-size: 4rem;
}

/* ===== Pricing ===== */
.pricing-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.pricing-card {
  background: #fff; border: 2px solid #e5e7eb; border-radius: 20px;
  padding: 36px 28px; text-align: center; position: relative;
  transition: transform 0.25s, box-shadow 0.25s;
}
.pricing-card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(0,0,0,0.08); }
.pricing-card.popular {
  border-color: #2563EB; box-shadow: 0 8px 24px rgba(37,99,235,0.15);
}
.popular-tag {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: #2563EB; color: #fff; padding: 4px 20px; border-radius: 20px;
  font-size: 0.8rem; font-weight: 600;
}
.pricing-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.pricing-card .price {
  font-size: 2.4rem; font-weight: 800; color: #2563EB; margin: 16px 0 6px;
}
.pricing-card .price small { font-size: 0.9rem; font-weight: 400; color: #6b7280; }
.pricing-card .price-note { font-size: 0.85rem; color: #6b7280; margin-bottom: 20px; }
.pricing-card ul { text-align: left; margin-bottom: 24px; }
.pricing-card ul li {
  padding: 8px 0; font-size: 0.9rem; color: #4A4A6A;
  border-bottom: 1px solid #f3f4f6; display: flex; align-items: center; gap: 8px;
}
.pricing-card ul li::before { content: "\2713"; color: #22c55e; font-weight: 700; }
.btn-pricing {
  display: block; padding: 12px 0; background: #2563EB; color: #fff;
  border-radius: 10px; font-weight: 600; font-size: 0.95rem;
  transition: background 0.2s;
}
.btn-pricing:hover { background: #1d4ed8; }
.btn-pricing-outline {
  display: block; padding: 12px 0; background: #fff; color: #2563EB;
  border: 2px solid #2563EB; border-radius: 10px; font-weight: 600; font-size: 0.95rem;
  transition: background 0.2s;
}
.btn-pricing-outline:hover { background: #eff6ff; }

/* ===== Security ===== */
.security-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
}
.security-item {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 16px;
  padding: 32px 24px; text-align: center;
  transition: transform 0.25s, box-shadow 0.25s;
}
.security-item:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
.security-icon {
  width: 56px; height: 56px; margin: 0 auto 16px;
  background: linear-gradient(135deg, #f0fdf4, #dcfce7);
  border-radius: 14px; display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
}
.security-item h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.security-item p { font-size: 0.88rem; color: #6b7280; line-height: 1.6; }

/* ===== Reviews ===== */
.reviews-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.review-card {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 16px;
  padding: 28px 24px;
  transition: transform 0.25s;
}
.review-card:hover { transform: translateY(-4px); }
.review-stars { color: #f59e0b; font-size: 1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: 0.95rem; color: #4A4A6A; line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-author { font-size: 0.85rem; font-weight: 600; color: #0f172a; }
.review-date { font-size: 0.8rem; color: #9ca3af; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  border: 1px solid #e5e7eb; border-radius: 12px; margin-bottom: 12px;
  overflow: hidden; background: #fff;
}
.faq-question {
  display: block; padding: 20px 24px; font-weight: 600; font-size: 1rem;
  color: #0f172a; cursor: pointer; transition: background 0.2s;
}
.faq-question:hover { background: #f8fafc; }
.faq-answer { padding: 0 24px 20px; font-size: 0.93rem; color: #4A4A6A; line-height: 1.8; }
.faq-answer ol { padding-left: 20px; list-style: decimal; }
.faq-answer ol li { margin-bottom: 8px; }

/* ===== CTA Bottom ===== */
.cta-bottom {
  background: linear-gradient(135deg, #1e3a8a, #2563EB);
  padding: 80px 0; text-align: center; color: #fff;
}
.cta-bottom h2 { font-size: 2.2rem; font-weight: 800; margin-bottom: 16px; }
.cta-bottom p { font-size: 1.1rem; opacity: 0.9; margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }
.btn-cta-white {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 16px 40px; background: #fff; color: #2563EB;
  border-radius: 12px; font-weight: 700; font-size: 1.1rem;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
}
.btn-cta-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.2); }

/* ===== Footer ===== */
.site-footer {
  background: #0f172a; color: #94a3b8; padding: 60px 0 30px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 0.95rem; font-weight: 600; margin-bottom: 16px; }
.footer-col a {
  display: block; font-size: 0.88rem; color: #94a3b8; padding: 4px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid #1e293b; padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.82rem; flex-wrap: wrap; gap: 12px;
}

/* ===== Page Hero (sub pages) ===== */
.page-hero {
  background: linear-gradient(160deg, #eff6ff 0%, #f0f9ff 50%, #fff 100%);
  padding: 60px 0 50px; text-align: center;
}
.page-hero h1 { font-size: 2.4rem; font-weight: 800; color: #0f172a; margin-bottom: 12px; }
.page-hero p { font-size: 1.05rem; color: #6b7280; max-width: 560px; margin: 0 auto; }

/* ===== About Page ===== */
.about-content { max-width: 800px; margin: 0 auto; }
.about-content h2 { font-size: 1.5rem; font-weight: 700; margin: 40px 0 16px; color: #0f172a; }
.about-content p { font-size: 1rem; color: #4A4A6A; line-height: 1.8; margin-bottom: 16px; }
.about-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin: 40px 0;
}
.about-stat {
  text-align: center; padding: 28px 16px;
  background: #fff; border: 1px solid #e5e7eb; border-radius: 16px;
}
.about-stat .num { font-size: 2rem; font-weight: 800; color: #2563EB; }
.about-stat .label { font-size: 0.85rem; color: #6b7280; margin-top: 4px; }

/* ===== Help Page ===== */
.help-categories { max-width: 900px; margin: 0 auto; }
.help-category {
  margin-bottom: 48px;
}
.help-category h2 {
  font-size: 1.5rem; font-weight: 700; color: #0f172a;
  margin-bottom: 24px; padding-bottom: 12px;
  border-bottom: 2px solid #2563EB; display: inline-block;
}
.help-item {
  background: #fff; border: 1px solid #e5e7eb; border-radius: 12px;
  margin-bottom: 16px; overflow: hidden;
}
.help-q {
  display: block; padding: 20px 24px; font-weight: 600; font-size: 1rem;
  color: #0f172a;
}
.help-a { padding: 0 24px 20px; }
.help-a p { font-size: 0.93rem; color: #4A4A6A; line-height: 1.8; margin-bottom: 10px; }
.help-a ol { padding-left: 20px; list-style: decimal; }
.help-a ol li { margin-bottom: 10px; font-size: 0.93rem; color: #4A4A6A; line-height: 1.7; }

/* ===== Privacy / Terms ===== */
.legal-content { max-width: 800px; margin: 0 auto; }
.legal-content h2 { font-size: 1.4rem; font-weight: 700; margin: 36px 0 14px; color: #0f172a; }
.legal-content p { font-size: 0.95rem; color: #4A4A6A; line-height: 1.8; margin-bottom: 14px; }
.legal-content ul { padding-left: 20px; margin-bottom: 14px; }
.legal-content ul li {
  font-size: 0.95rem; color: #4A4A6A; line-height: 1.8; margin-bottom: 6px;
  list-style: disc;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 12px 0; font-size: 0.85rem; color: #9ca3af;
}
.breadcrumb a { color: #2563EB; }
.breadcrumb span { margin: 0 6px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .security-grid { grid-template-columns: repeat(2, 1fr); }
  .reviews-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .product-row, .product-row:nth-child(even) { flex-direction: column; gap: 30px; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .menu-toggle { display: flex; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 24px; }
  .section-title { font-size: 1.7rem; }
  .features-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .security-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-btns { flex-direction: column; align-items: center; }
  .cta-bottom h2 { font-size: 1.6rem; }
  .page-hero h1 { font-size: 1.8rem; }
}