:root {
  --bg: #0a1118;
  --surface: #142230;
  --surface-hover: #1c2e40;
  --accent: #4dd0ff;
  --accent2: #ffd166;
  --text: #f0faff;
  --muted: #8fa8b8;
  --font-display: 'Russo One', sans-serif;
  --font-body: 'Open Sans', sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--font-body);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: normal; line-height: 1.2; }
.container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 20px; }

/* --- HEADER (Matches Part A1) --- */
header {
  background-color: rgba(10, 17, 24, 0.95);
  backdrop-filter: blur(10px);
  position: sticky; top: 0; z-index: 100;
  border-bottom: 1px solid rgba(77, 208, 255, 0.1);
}
.header-inner {
  display: flex; justify-content: space-between; align-items: center; height: 70px;
}
.logo {
  font-family: var(--font-display); font-size: 24px; color: var(--text);
  display: flex; align-items: center; gap: 10px; text-transform: uppercase; letter-spacing: 1px;
}
.logo span { color: var(--accent); }
.nav-links { display: none; gap: 24px; }
.nav-links a { color: var(--text); font-size: 14px; font-weight: 600; }
.nav-links a:hover { color: var(--accent); }
.header-ctas { display: none; gap: 12px; }
.btn {
  padding: 10px 20px; border-radius: var(--radius-sm); font-weight: 700;
  font-size: 14px; text-align: center; cursor: pointer; display: inline-block;
}
.btn-primary { background-color: var(--accent); color: #000; }
.btn-primary:hover { background-color: #3bc0f0; box-shadow: 0 0 15px rgba(77,208,255,0.4); }
.btn-secondary { background-color: transparent; color: var(--accent2); border: 1px solid var(--accent2); }
.btn-secondary:hover { background-color: rgba(255,209,102,0.1); }
.mobile-toggle {
  background: none; border: none; color: var(--text); font-size: 28px; cursor: pointer; display: block;
}
.mobile-menu {
  display: none; background-color: var(--surface); padding: 20px;
  position: absolute; top: 70px; left: 0; width: 100%; border-bottom: 1px solid rgba(77,208,255,0.1);
}
.mobile-menu.active { display: flex; flex-direction: column; gap: 16px; }
.mobile-menu a { color: var(--text); font-size: 16px; font-weight: 600; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
.mobile-menu .header-ctas { display: flex; flex-direction: column; margin-top: 10px; gap: 10px; }

/* --- HERO BANNER --- */
.hero-banner {
  position: relative;
  padding: 60px 0 80px;
  background: linear-gradient(180deg, rgba(20,34,48,0.8) 0%, var(--bg) 100%);
  overflow: hidden;
  text-align: center;
}
.sky-deco {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  pointer-events: none; z-index: 0;
}
.kite-shape {
  position: absolute;
  background: var(--accent);
  clip-path: polygon(50% 0%, 100% 30%, 50% 100%, 0% 30%);
  opacity: 0.05;
}
.kite-1 { width: 120px; height: 180px; top: -20px; left: 10%; transform: rotate(15deg); }
.kite-2 { width: 80px; height: 120px; top: 40px; right: 15%; background: var(--accent2); transform: rotate(-20deg); }
.kite-3 { width: 200px; height: 300px; bottom: -100px; left: 40%; opacity: 0.02; }

.hero-content { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; }
.breadcrumb {
  font-size: 13px; color: var(--muted); margin-bottom: 24px;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(20,34,48,0.6); padding: 8px 16px; border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.05);
}
.hero-banner h1 {
  font-size: 32px; color: var(--text); margin-bottom: 24px;
  text-shadow: 0 4px 12px rgba(0,0,0,0.5);
  letter-spacing: 0.5px;
}
.meta-chips {
  display: flex; justify-content: center; gap: 12px; flex-wrap: wrap;
}
.meta-chips span {
  font-size: 12px; font-weight: 600; color: var(--bg);
  background-color: var(--accent2); padding: 6px 12px; border-radius: 4px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.meta-chips span:first-child { background-color: var(--accent); }

/* --- MAIN CONTENT --- */
.page-content {
  max-width: 840px; margin: 0 auto; padding: 0 20px 80px; position: relative; z-index: 1;
}

/* Intro Block */
.intro-block {
  background: var(--surface);
  border-left: 4px solid var(--accent2);
  padding: 30px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 50px;
  position: relative;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.intro-block::before {
  content: '❝'; font-family: var(--font-display); font-size: 60px;
  position: absolute; top: -10px; left: 20px; color: rgba(255,209,102,0.1);
  line-height: 1;
}
.intro-block p {
  font-size: 16px; color: var(--text); position: relative; z-index: 1;
}

/* Content Sections */
.guide-section { margin-bottom: 60px; position: relative; }
.guide-section h2 {
  font-size: 24px; color: var(--accent); margin-bottom: 20px;
  display: flex; align-items: center; gap: 15px;
}
.step-badge {
  flex-shrink: 0; width: 40px; height: 40px;
  background: rgba(77,208,255,0.1); border: 1px solid var(--accent);
  color: var(--accent); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 18px;
}
.guide-section p { margin-bottom: 16px; color: #d0e3f0; font-size: 15px; }
.guide-section a { color: var(--accent2); font-weight: 600; border-bottom: 1px dashed var(--accent2); }
.guide-section a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* Tips List */
.tips-list {
  list-style: none; margin: 24px 0; padding: 24px;
  background: rgba(20,34,48,0.5); border-radius: var(--radius-md);
  border: 1px solid rgba(255,255,255,0.05);
}
.tips-list li {
  position: relative; padding-left: 35px; margin-bottom: 16px; color: #d0e3f0; font-size: 15px;
}
.tips-list li:last-child { margin-bottom: 0; }
.tips-list li::before {
  content: ''; position: absolute; left: 0; top: 4px;
  width: 16px; height: 20px; background: var(--accent2);
  clip-path: polygon(50% 0%, 100% 30%, 50% 100%, 0% 30%);
}

/* FAQ Section */
.faq-container { margin-top: 60px; }
.faq-container h2 {
  font-size: 28px; text-align: center; margin-bottom: 30px; color: var(--text);
}
details {
  background: var(--surface); margin-bottom: 12px; border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.05); overflow: hidden;
}
summary {
  padding: 20px; font-weight: 700; cursor: pointer; list-style: none;
  display: flex; justify-content: space-between; align-items: center;
  color: var(--text); font-size: 16px;
}
summary::-webkit-details-marker { display: none; }
summary::after {
  content: '+'; font-family: var(--font-display); color: var(--accent); font-size: 20px; transition: var(--transition);
}
details[open] summary::after { content: '-'; color: var(--accent2); }
details p {
  padding: 0 20px 20px; color: var(--muted); font-size: 15px; border-top: 1px solid rgba(255,255,255,0.05); margin-top: 10px; padding-top: 15px;
}

/* Related Links */
.related-links-section {
  margin-top: 60px; padding-top: 40px; border-top: 1px dashed rgba(143,168,184,0.2);
}
.related-links-section h3 {
  font-size: 20px; color: var(--text); margin-bottom: 24px; text-align: center;
}
.related-grid {
  display: grid; grid-template-columns: 1fr; gap: 12px;
}
.related-card {
  background: var(--surface); padding: 16px; border-radius: var(--radius-sm);
  text-align: center; border: 1px solid rgba(77,208,255,0.1);
  transition: var(--transition);
}
.related-card a {
  display: block; font-weight: 700; color: var(--accent); font-size: 15px; border: none;
}
.related-card:hover { background: var(--surface-hover); transform: translateY(-2px); border-color: var(--accent); }

/* CTA Block */
.final-cta-block {
  margin-top: 60px; padding: 40px 20px;
  background: linear-gradient(135deg, var(--surface) 0%, rgba(20,34,48,0.4) 100%);
  border-radius: var(--radius-lg); text-align: center;
  border: 1px solid rgba(255,209,102,0.2);
  position: relative; overflow: hidden;
}
.final-cta-block::before {
  content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background: radial-gradient(circle, rgba(77,208,255,0.1) 0%, transparent 60%); pointer-events: none;
}
.final-cta-block h3 { font-size: 24px; margin-bottom: 16px; color: var(--text); position: relative; z-index: 1;}
.final-cta-block p { color: var(--muted); margin-bottom: 24px; font-size: 15px; position: relative; z-index: 1;}
.cta-buttons { display: flex; flex-direction: column; gap: 12px; justify-content: center; position: relative; z-index: 1;}
.cta-buttons .btn { padding: 14px 28px; font-size: 16px; }

/* --- FOOTER (Matches Part A2) --- */
footer {
  background-color: #05080c; border-top: 1px solid rgba(255,255,255,0.05);
  padding: 60px 0 20px; margin-top: 40px;
}
.footer-grid {
  display: grid; grid-template-columns: 1fr; gap: 40px; margin-bottom: 40px;
}
.footer-brand {
  font-family: var(--font-display); font-size: 28px; color: var(--text);
  text-transform: uppercase; margin-bottom: 16px;
}
.footer-brand span { color: var(--accent); }
.footer-tagline { color: var(--muted); font-size: 14px; line-height: 1.6; max-width: 300px; }
.footer-links {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px;
}
.footer-links a { color: var(--muted); font-size: 14px; }
.footer-links a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  text-align: center; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.05);
  color: var(--muted); font-size: 12px;
}

/* --- MEDIA QUERIES --- */
@media (min-width: 768px) {
  .header-inner { height: 80px; }
  .nav-links { display: flex; }
  .header-ctas { display: flex; }
  .mobile-toggle { display: none; }
  .mobile-menu { display: none !important; }

  .hero-banner { padding: 80px 0 100px; }
  .hero-banner h1 { font-size: 42px; }
  .intro-block { padding: 40px; font-size: 18px; }

  .related-grid { grid-template-columns: repeat(3, 1fr); }
  .cta-buttons { flex-direction: row; }

  .footer-grid { grid-template-columns: 1fr 2fr; }
  .footer-links { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
  .hero-banner h1 { font-size: 48px; }
  .related-grid { grid-template-columns: repeat(5, 1fr); }
}


/* pipeline image & layout guards */
html, body { overflow-x: clip; }
img { max-width: 100%; height: auto; }
img.site-logo { height: 40px; width: auto; max-width: 240px; object-fit: contain; flex: none; }
header .logo a { display: inline-flex; align-items: center; flex: none; text-decoration: none; }
img.hero-visual { width: 100%; max-width: 560px; height: auto; object-fit: cover; border-radius: 16px; display: block; margin-inline: auto; }
img[class^="strip-"], img[class*=" strip-"] { width: 100%; height: auto; display: block; border-radius: 12px; object-fit: cover; }
/* 合规声明块（zb-disclaimer，全站 footer） */
.zb-disclaimer { margin-top: 18px !important; padding: 14px 0 0 0 !important; border-top: 1px solid rgba(128,128,128,.25) !important; font-size: .72rem !important; line-height: 1.7 !important; opacity: .85 !important; display: block !important; text-align: left !important; width: 100% !important; clear: both !important; }
.zb-disclaimer .zb-18 { display: inline-block !important; padding: 2px 10px !important; border: 1.5px solid currentColor !important; border-radius: 6px !important; font-weight: 800 !important; letter-spacing: 1px !important; margin: 0 0 10px 0 !important; font-size: .78rem !important; }
.zb-disclaimer p { display: block !important; margin: 5px 0 !important; padding: 0 !important; color: inherit !important; font-size: .72rem !important; line-height: 1.7 !important; }
.zb-disclaimer p:last-child { margin-bottom: 0 !important; }