:root {
  --bg: #f5f6fb;
  --surface: #fff;
  --text: #1a1d26;
  --muted: #5c6370;
  --border: #e8eaf0;
  --primary: #6d28d9;
  --primary-hover: #5b21b6;
  --primary-soft: #ede9fe;
  --accent: #e50914;
  --accent-soft: #fef2f2;
  --shadow: 0 4px 24px rgba(30, 27, 75, 0.08);
  --radius: 16px;
  --radius-sm: 12px;
  --max: 1120px;
  --header-h: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 0.5rem 1rem;
  background: var(--primary);
  color: #fff;
}

.skip-link:focus {
  left: 0;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
}

.logo-img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: block;
  object-fit: cover;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 8px;
  padding: 0.4rem 0.65rem;
  cursor: pointer;
  font-size: 0.875rem;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.9375rem;
  text-decoration: none;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--primary);
  background: var(--primary-soft);
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.65rem 1.35rem;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.15s;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

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

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

.btn-outline {
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid transparent;
}

.btn-outline:hover {
  background: #ddd6fe;
  color: var(--primary-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.header-cta {
  flex-shrink: 0;
}

/* Hero */
.hero {
  padding: 2.5rem 0 2rem;
  background: radial-gradient(ellipse 80% 60% at 70% 0%, #ede9fe 0%, transparent 55%),
    radial-gradient(ellipse 60% 50% at 10% 20%, #fce7f3 0%, transparent 50%), var(--bg);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8125rem;
  color: var(--primary);
  background: var(--primary-soft);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  line-height: 1.25;
  margin: 0 0 1rem;
  font-weight: 800;
}

.hero h1 .hl {
  color: var(--primary);
}

.hero-lead {
  color: var(--muted);
  margin: 0 0 1.5rem;
  max-width: 36em;
}

.hero-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  border: 1px solid var(--border);
}

.hero-card h2 {
  font-size: 0.9375rem;
  margin: 0 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.hero-card ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-card li {
  display: flex;
  gap: 0.75rem;
  padding: 0.65rem 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.875rem;
}

.hero-card li:last-child {
  border-bottom: none;
}

.rank {
  font-weight: 700;
  color: var(--accent);
  min-width: 2rem;
}

/* Sections */
.section {
  padding: 2.5rem 0;
}

.section-head {
  text-align: center;
  margin-bottom: 1.75rem;
}

.section-head h2 {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  margin: 0 0 0.5rem;
}

.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
}

/* Products */
.product-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.product-tabs span {
  padding: 0.4rem 1rem;
  border-radius: 999px;
  font-size: 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
}

.product-tabs span.is-active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

.product-card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.product-thumb {
  aspect-ratio: 16 / 10;
  background: linear-gradient(145deg, #141414, #3d0810);
  display: grid;
  place-items: center;
  position: relative;
}

.product-thumb span {
  color: var(--accent);
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.product-badge {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font-size: 0.4375rem;
  font-weight: 700;
  background: #f97316;
  color: #fff;
  padding: 0.1rem 0.28rem;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.product-body {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-body h3 {
  font-size: 1rem;
  margin: 0 0 0.35rem;
}

.product-desc {
  font-size: 0.8125rem;
  color: var(--muted);
  margin: 0 0 0.75rem;
  flex: 1;
  line-height: 1.45;
}

.product-price {
  font-size: 1.125rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.product-price small {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--muted);
}

.product-card .btn {
  width: 100%;
  padding: 0.55rem;
  font-size: 0.875rem;
}

/* Mobile product list */
.products-list {
  display: none;
  flex-direction: column;
  gap: 0.75rem;
}

.product-row {
  display: grid;
  grid-template-columns: 56px 1fr auto;
  gap: 0.75rem;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.product-row-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: linear-gradient(145deg, #141414, #3d0810);
  display: grid;
  place-items: center;
  color: var(--accent);
  font-weight: 900;
  font-size: 0.65rem;
}

.product-row-main h3 {
  margin: 0;
  font-size: 0.9375rem;
}

.product-row-main p {
  margin: 0.2rem 0 0;
  font-size: 0.75rem;
  color: var(--muted);
}

.product-row-side {
  text-align: right;
}

.product-row-side .price {
  font-weight: 800;
  color: var(--primary);
  font-size: 0.9375rem;
  display: block;
}

.product-row-side .btn {
  margin-top: 0.35rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
}

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

.step-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}

.step-num {
  width: 2.25rem;
  height: 2.25rem;
  margin: 0 auto 0.75rem;
  border-radius: 50%;
  background: var(--text);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.9375rem;
}

.step-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.step-card p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--muted);
}

/* Features / intro */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.feature-tag {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary);
}

.intro-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
}

.intro-block p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

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

.features-after-intro {
  margin-top: 1.5rem;
}

.legal-stack {
  margin-bottom: 1.5rem;
}

.legal-stack:last-child {
  margin-bottom: 0;
}

.faq-more-link {
  text-align: center;
  margin-top: 1.25rem;
}

/* FAQ accordion */
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.65rem;
  overflow: hidden;
}

.faq-item summary {
  padding: 1rem 1.15rem;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9375rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--muted);
  flex-shrink: 0;
}

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

.faq-answer {
  padding: 0 1.15rem 1rem;
  font-size: 0.875rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 0;
  padding-top: 0.85rem;
}

/* Page inner (FAQ / About) */
.page-hero {
  padding: 2rem 0 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.breadcrumb {
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.breadcrumb a {
  color: var(--muted);
}

.page-hero h1 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  margin: 0 0 0.75rem;
}

.page-hero .lead {
  margin: 0;
  color: var(--muted);
  max-width: 40em;
  font-size: 0.9375rem;
}

.page-content {
  padding: 2rem 0 3rem;
}

.link-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.link-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.link-card h2 {
  font-size: 1rem;
  margin: 0 0 0.35rem;
}

.link-card p {
  margin: 0 0 0.75rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.cta-banner {
  margin-top: 2rem;
  background: #1a1d26;
  color: #fff;
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.cta-banner h2 {
  margin: 0 0 0.25rem;
  font-size: 1.125rem;
}

.cta-banner p {
  margin: 0;
  font-size: 0.875rem;
  opacity: 0.85;
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.about-num-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-num-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.about-num-item .num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--text);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 700;
}

.about-num-item h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.about-num-item p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  margin-top: 2.5rem;
  padding: 1.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.about-section-title {
  font-size: 1.25rem;
  margin: 0 0 1rem;
}

.about-cta-text {
  color: var(--muted);
  font-size: 0.9375rem;
  margin: 0 0 1.25rem;
}

.btn-spaced {
  margin-left: 0.5rem;
}

.about-visual {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-sm);
  background: linear-gradient(160deg, #ede9fe, #fce7f3 40%, #f5f6fb);
  border: 1px dashed var(--border);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 1rem;
  color: var(--muted);
  font-size: 0.875rem;
}

/* Footer */
.site-footer {
  background: #fff;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}

.footer-trust {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  text-align: center;
  font-size: 0.875rem;
  font-weight: 600;
}

.footer-trust span {
  color: var(--muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  padding: 2rem 0;
}

.footer-grid h3 {
  font-size: 0.9375rem;
  margin: 0 0 0.75rem;
}

.footer-grid p,
.footer-grid ul {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--muted);
}

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

.footer-grid li {
  margin-bottom: 0.35rem;
}

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

.footer-grid a:hover {
  color: var(--primary);
}

.footer-bottom {
  padding: 1rem 0 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

.footer-mobile {
  display: none;
}

.footer-accordion {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.65rem;
  background: var(--surface);
  overflow: hidden;
}

.footer-accordion summary {
  padding: 1rem 1.1rem;
  font-weight: 600;
  font-size: 0.9375rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.footer-accordion summary::-webkit-details-marker {
  display: none;
}

.footer-accordion summary::after {
  content: "";
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  flex-shrink: 0;
  transition: transform 0.15s;
}

.footer-accordion[open] summary::after {
  transform: rotate(-135deg);
}

.footer-accordion-body {
  padding: 0 1.1rem 1rem;
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.55;
}

.footer-accordion-body p {
  margin: 0;
}

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

.footer-accordion-body li {
  margin-bottom: 0.5rem;
}

.footer-accordion-body li:last-child {
  margin-bottom: 0;
}

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

.footer-accordion-body a:hover {
  color: var(--primary);
}

.footer-info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  background: #eef0f6;
  border-radius: 10px;
  font-size: 0.8125rem;
  color: var(--text);
}

.footer-info-row:last-child {
  margin-bottom: 0;
}

.footer-info-row strong {
  font-weight: 600;
}

.footer-text-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  font-family: inherit;
  text-decoration: none;
  display: inline-block;
}

.footer-text-btn:hover {
  color: var(--primary-hover);
}

.footer-note {
  margin-top: 0.5rem;
  font-size: 0.75rem;
}

@media (max-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-card {
    max-width: 400px;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .header-cta {
    display: none;
  }

  .site-header .header-inner {
    position: relative;
  }

  .products-grid {
    display: none;
  }

  .products-list {
    display: flex;
  }

  .steps {
    grid-template-columns: 1fr 1fr;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-desktop {
    display: none;
  }

  .footer-mobile {
    display: block;
    padding: 1.25rem 0 0.5rem;
  }

  .footer-bottom {
    border-top: none;
    padding-top: 0.5rem;
  }

  .about-cards,
  .about-split,
  .link-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .steps {
    grid-template-columns: 1fr;
  }
}