:root {
  --bg-deep: #07070f;
  --bg-card: #111122;
  --bg-elevated: #18182a;
  --border: rgba(255, 255, 255, 0.07);
  --text: #ececf4;
  --text-muted: #9494ae;
  --accent: #ff7a18;
  --accent-soft: rgba(255, 122, 24, 0.14);
  --purple: #7c4dff;
  --purple-soft: rgba(124, 77, 255, 0.12);
  --gold: #d4a853;
  --radius: 16px;
  --radius-lg: 24px;
  --nav-h: 64px;
  --sticky-ads-h: 0px;
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.45);
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 85% 8%, rgba(255, 122, 24, 0.08), transparent),
    radial-gradient(ellipse 50% 35% at 10% 90%, rgba(124, 77, 255, 0.07), transparent);
  pointer-events: none;
  z-index: 0;
}

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

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: #ff9a4d; }

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  background: rgba(7, 7, 15, 0.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-header nav {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

/* Ads top */
.ads-top-wrap {
  padding-top: calc(var(--nav-h) + 12px);
  background: linear-gradient(180deg, rgba(17, 17, 34, 0.6), transparent);
}

#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  background: transparent;
  margin: 10px 0;
  gap: 8px;
}

#ads > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70px;
}

#ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 6px 18px rgba(24, 24, 24, 0.12);
  transition: transform 180ms ease, box-shadow 180ms ease;
  border: none;
}

#ads a { border-radius: 15px; }

#ads img:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 10px 24px rgba(255, 122, 24, 0.25);
}

#ads figcaption,
#ads .caption {
  height: 15px;
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

/* Sticky ads bar */
.sticky-ads-bar {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 999;
  background: rgba(11, 11, 22, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
  transform: translateY(-120%);
  opacity: 0;
  transition: transform 0.35s ease, opacity 0.35s ease;
  pointer-events: none;
}

.sticky-ads-bar.visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.sticky-ads-bar .ads-inner {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  max-width: 960px;
  margin: 0 auto;
}

.sticky-ads-bar .ads-inner > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: calc(12.5% - 6px);
  min-width: 72px;
}

.sticky-ads-bar .ads-inner figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.sticky-ads-bar .ads-inner img {
  width: 58px;
  height: 58px;
  object-fit: cover;
  margin: 0 auto;
  border-radius: 14px;
}

.sticky-ads-bar .ads-inner .caption {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

@media (max-width: 768px) {
  .sticky-ads-bar {
    top: auto;
    bottom: 0;
    border-bottom: none;
    border-top: 1px solid var(--border);
    padding: 10px 8px calc(10px + env(safe-area-inset-bottom));
    transform: translateY(120%);
  }

  .sticky-ads-bar .ads-inner {
    align-items: flex-start;
  }

  .sticky-ads-bar .ads-inner > div { width: calc(25% - 6px); min-width: 0; }
  .sticky-ads-bar .ads-inner img { width: 52px; height: 52px; }
  .sticky-ads-bar .ads-inner .caption {
    height: auto;
    line-height: 1.2;
    white-space: normal;
  }

  body.has-sticky-ads { padding-bottom: 100px; }
}

@media (min-width: 769px) {
  .sticky-ads-bar { top: var(--nav-h); }
}

/* Hero */
.hero {
  padding: 48px 0 72px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--accent-soft);
  border: 1px solid rgba(255, 122, 24, 0.25);
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero-badge span {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(1.85rem, 4.5vw, 2.75rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}

.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.hero-stat strong {
  display: block;
  font-size: 1.5rem;
  color: var(--text);
  font-weight: 700;
}

.hero-stat span {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.hero-phones {
  position: relative;
  height: 480px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-stack {
  position: relative;
  width: 240px;
  height: 440px;
}

.phone-stack img {
  position: absolute;
  width: 210px;
  border-radius: 22px;
  box-shadow: var(--shadow);
  border: 2px solid rgba(255, 255, 255, 0.08);
  transition: transform 0.4s ease;
}

.phone-stack img:nth-child(1) {
  top: 0;
  left: 0;
  transform: rotate(-8deg);
  z-index: 1;
}

.phone-stack img:nth-child(2) {
  top: 30px;
  left: 50px;
  transform: rotate(2deg);
  z-index: 2;
}

.phone-stack img:nth-child(3) {
  top: 60px;
  left: 20px;
  transform: rotate(-3deg);
  z-index: 3;
}

.phone-stack img:nth-child(4) {
  top: 90px;
  left: 70px;
  transform: rotate(6deg);
  z-index: 4;
}

.hero-phones:hover .phone-stack img:nth-child(1) { transform: rotate(-10deg) translateY(-6px); }
.hero-phones:hover .phone-stack img:nth-child(4) { transform: rotate(8deg) translateY(-8px); }

/* Sections */
section { padding: 64px 0; }

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.35;
}

.section-desc {
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 40px;
}

/* Content ratio 3:7 blocks */
.content-block {
  display: grid;
  grid-template-columns: 3fr 7fr;
  gap: 40px;
  align-items: start;
  margin-bottom: 56px;
}

.content-block.reverse { grid-template-columns: 7fr 3fr; }
.content-block.reverse .block-media { order: 2; }
.content-block.reverse .block-text { order: 1; }

.block-media img {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.block-media figcaption {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

.block-text h3 {
  font-size: 1.25rem;
  margin-bottom: 14px;
  color: var(--text);
}

.block-text p {
  color: var(--text-muted);
  margin-bottom: 14px;
}

.block-text ul {
  margin: 16px 0;
  padding-left: 20px;
  color: var(--text-muted);
}

.block-text li { margin-bottom: 8px; }

/* Bento features */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.bento-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.25s, transform 0.25s;
}

.bento-item:hover {
  border-color: rgba(255, 122, 24, 0.3);
  transform: translateY(-3px);
}

.bento-item.wide { grid-column: span 2; }
.bento-item.tall { grid-row: span 1; }

.bento-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
  background: var(--purple-soft);
}

.bento-item:nth-child(2) .bento-icon { background: var(--accent-soft); }
.bento-item:nth-child(3) .bento-icon { background: rgba(212, 168, 83, 0.12); }
.bento-item:nth-child(4) .bento-icon { background: rgba(92, 124, 255, 0.12); }

.bento-item h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.bento-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* SEO cards */
.seo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-bottom: 24px;
}

.seo-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.seo-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.seo-card h3 {
  padding: 18px 18px 8px;
  font-size: 1.02rem;
}

.seo-card p {
  padding: 0 18px 20px;
  color: var(--text-muted);
  font-size: 0.92rem;
}

.seo-prose {
  margin-top: 20px;
}

/* CTA band */
.cta-band {
  background: linear-gradient(135deg, rgba(255, 122, 24, 0.12), rgba(124, 77, 255, 0.1));
  border: 1px solid rgba(255, 122, 24, 0.2);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
  margin: 48px 0;
}

.cta-band h2 {
  font-size: 1.6rem;
  margin-bottom: 12px;
}

.cta-band p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: linear-gradient(135deg, var(--accent), #ff5722);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 8px 28px rgba(255, 122, 24, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(255, 122, 24, 0.45);
  color: #fff;
}

.btn-outline {
  display: inline-flex;
  padding: 12px 28px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.9rem;
  transition: border-color 0.2s, background 0.2s;
}

.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

/* FAQ */
.faq-list { max-width: 800px; }

.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 22px 0;
}

.faq-item h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  color: var(--text);
}

.faq-item p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* Text-only SEO sections */
.prose-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  margin-bottom: 32px;
}

.prose-section h2 {
  font-size: 1.35rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.prose-section h3 {
  font-size: 1.1rem;
  margin: 24px 0 12px;
  color: var(--text);
}

.prose-section p {
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* Breadcrumb */
.breadcrumb {
  padding: calc(var(--nav-h) + 24px) 0 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--text); }

/* Subpage */
.page-header {
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 40px;
}

.page-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 10px;
}

.page-header p { color: var(--text-muted); }

.legal-content h2 {
  font-size: 1.2rem;
  margin: 32px 0 14px;
  color: var(--text);
}

.legal-content p,
.legal-content li {
  color: var(--text-muted);
  margin-bottom: 12px;
}

.legal-content ul {
  padding-left: 22px;
  margin-bottom: 16px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 32px;
  margin-top: 64px;
  background: rgba(11, 11, 22, 0.5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-top: 14px;
  max-width: 320px;
}

.footer-nav h4 {
  font-size: 0.85rem;
  color: var(--text);
  margin-bottom: 16px;
  letter-spacing: 0.06em;
}

.footer-nav ul { list-style: none; }

.footer-nav li { margin-bottom: 10px; }

.footer-nav a {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* Error pages */
.error-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 20px 60px;
}

.error-code {
  font-size: 6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.error-page h1 { font-size: 1.5rem; margin-bottom: 12px; }
.error-page p { color: var(--text-muted); margin-bottom: 28px; }

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero-phones { height: 380px; order: -1; }
  .phone-stack { transform: scale(0.85); }
  .content-block,
  .content-block.reverse { grid-template-columns: 1fr; }
  .content-block.reverse .block-media { order: 0; }
  .bento-grid { grid-template-columns: 1fr; }
  .bento-item.wide { grid-column: span 1; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 768px) {
  .site-header nav {
    width: 100%;
    justify-content: flex-end;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(7, 7, 15, 0.98);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .menu-toggle { display: block; }

  .hero { padding-top: 24px; }
  .hero-stats { gap: 20px; }
  .prose-section { padding: 28px 20px; }
  .cta-band { padding: 32px 24px; }

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

@media (min-width: 769px) {
  .sticky-ads-bar.visible ~ .site-header { box-shadow: none; }
}