/* ===== Shared Styles for Sub-pages ===== */
:root {
  --color-primary: #312E81;
  --color-primary-dark: #1E1B4B;
  --color-primary-mid: #252180;
  --color-primary-light: #4338CA;
  --color-accent: #4F46E5;
  --color-accent-light: #6366F1;
  --color-indigo-soft: #C7CCED;
  --color-indigo-light: #E0E4F7;
  --color-gold: #D4983C;
  --color-gold-dark: #B87A2A;
  --color-gold-light: #E8BA5E;
  --color-gold-soft: #F5D78E;
  --color-gold-pale: #FEF3DC;
  --color-gold-bg: #FEF9F0;
  --color-deep: #0A1628;
  --color-deep-mid: #112240;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F5F3FA;
  --color-bg-indigo: #EEF1FA;
  --color-bg-warm: #FDF9F2;
  --color-text: #1F2937;
  --color-text-secondary: #4B5563;
  --color-text-muted: #9CA3AF;
  --color-border: #E4E7EE;
  --color-border-light: #F0F2F7;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 2px rgba(15,10,40,0.04);
  --shadow: 0 1px 3px rgba(15,10,40,0.06), 0 1px 2px rgba(15,10,40,0.04);
  --shadow-md: 0 4px 8px -1px rgba(15,10,40,0.07), 0 2px 4px -2px rgba(15,10,40,0.04);
  --shadow-lg: 0 12px 30px -5px rgba(15,10,40,0.08), 0 8px 10px -6px rgba(15,10,40,0.04);
  --shadow-gold: 0 4px 20px rgba(212,152,60,0.15);
  --shadow-indigo: 0 4px 20px rgba(49,46,129,0.1);
  --font-serif: "Noto Serif SC", "STSong", "Songti SC", "SimSun", "KaiTi", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --max-width: 860px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 18px; }
body {
  background: linear-gradient(180deg, #FFFFFF 0%, #F8F6FC 15%, #FDF9F2 35%, #F5F3FA 55%, #FFFFFF 75%, #FDF9F2 90%, #FFFFFF 100%);
  color: var(--color-text);
  font-family: var(--font-sans);
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, .serif { font-family: var(--font-serif); }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 700; line-height: 1.2; letter-spacing: 0.02em; }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 700; line-height: 1.3; }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 600; line-height: 1.35; margin-bottom: 0.6rem; }
h4 { font-size: 1.05rem; font-weight: 600; margin-bottom: 0.5rem; }
p { margin-bottom: 0.9rem; color: var(--color-text-secondary); }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* Sub-page nav */
.sub-nav {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(255,255,255,0.94);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(49,46,129,0.08);
}
.sub-nav-inner {
  max-width: var(--max-width); margin: 0 auto; padding: 0.85rem 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
}
.sub-nav-back {
  display: flex; align-items: center; gap: 0.5rem; text-decoration: none;
  font-family: var(--font-serif); font-size: 1rem; font-weight: 700;
  color: var(--color-primary-dark);
}
.sub-nav-back svg { width: 28px; height: 28px; }
.sub-nav-domain {
  font-size: 0.7rem; font-weight: 600; color: var(--color-gold);
  letter-spacing: 0.08em; background: var(--color-gold-pale);
  padding: 0.2rem 0.6rem; border-radius: 3px; text-decoration: none;
}

/* Article layout */
.article { padding: 3rem 0 4rem; }
.article-header { text-align: center; margin-bottom: 3rem; }
.article-header .label {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-size: 0.82rem; font-weight: 600; letter-spacing: 0.12em;
  color: var(--color-gold); margin-bottom: 0.8rem; text-transform: uppercase;
}
.article-header .label::before {
  content: ''; width: 24px; height: 2px;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-light));
  border-radius: 1px;
}
.article-header h1 { margin-bottom: 0.6rem; }
.article-header .subtitle { color: var(--color-text-muted); font-size: 0.95rem; }

.article-body { font-size: 1rem; line-height: 1.9; }
.article-body section { margin-bottom: 2.8rem; }
.article-body h2 {
  margin-top: 2.5rem; margin-bottom: 1rem; padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--color-gold-pale); display: inline-block;
}
.article-body h3 { margin-top: 1.8rem; margin-bottom: 0.7rem; color: var(--color-primary-dark); }
.article-body p { margin-bottom: 1rem; }
.article-body strong { color: var(--color-primary-dark); }
.article-body ul { margin: 0.8rem 0 1rem 1.5rem; }
.article-body li { margin-bottom: 0.45rem; color: var(--color-text-secondary); }
.article-body blockquote {
  border-left: 3px solid var(--color-gold); padding: 0.8rem 1.4rem;
  margin: 1.5rem 0; background: var(--color-gold-bg); border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--font-serif); color: var(--color-primary-dark); font-size: 1.05rem;
}
.article-body .callout {
  background: linear-gradient(135deg, var(--color-bg-indigo), var(--color-gold-pale));
  border: 1px solid rgba(49,46,129,0.1); border-radius: var(--radius-lg);
  padding: 1.5rem; margin: 1.5rem 0;
}
.article-body .callout h4 { color: var(--color-primary-dark); }
.article-body .numbered-block {
  display: flex; gap: 1rem; margin: 1.2rem 0;
}
.article-body .numbered-block .num {
  flex-shrink: 0; width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-mid));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif); font-size: 0.9rem; font-weight: 700;
}
.article-body .numbered-block .content { flex: 1; }
.article-body .numbered-block .content h4 { margin-bottom: 0.3rem; color: var(--color-primary-dark); }
.article-body .numbered-block .content p { margin-bottom: 0.3rem; font-size: 0.95rem; }

/* Cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.2rem; margin: 1.5rem 0; }
.card-item {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 1.5rem; transition: var(--transition); position: relative; overflow: hidden;
}
.card-item::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold)); border-radius: 3px 3px 0 0;
}
.card-item:hover { border-color: var(--color-gold-light); box-shadow: var(--shadow-lg), var(--shadow-gold); transform: translateY(-2px); }
.card-item h4 { color: var(--color-primary-dark); margin-bottom: 0.5rem; }
.card-item p { font-size: 0.92rem; }
.card-item .tag {
  display: inline-block; margin-top: 0.5rem; font-size: 0.76rem;
  color: var(--color-gold-dark); background: var(--color-gold-pale);
  padding: 0.15rem 0.55rem; border-radius: 20px; font-weight: 500;
}

/* Service section */
.service-section {
  background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  padding: 2rem; margin-bottom: 2rem; transition: var(--transition);
  position: relative; overflow: hidden;
}
.service-section::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-gold)); border-radius: 3px 3px 0 0;
}
.service-section:hover { box-shadow: var(--shadow-lg), var(--shadow-gold); }
.service-section h3 { display: flex; align-items: center; gap: 0.6rem; }
.service-section .service-icon-sm {
  width: 40px; height: 40px; border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  background: var(--color-gold-pale); color: var(--color-gold-dark);
  font-size: 1.15rem; flex-shrink: 0; border: 1px solid rgba(212,152,60,0.25);
  animation: iconFloat 5s ease-in-out infinite;
}
@keyframes iconFloat { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-4px); } }
.service-section .price {
  display: inline-block; margin-top: 0.8rem; padding: 0.35rem 0.9rem;
  background: var(--color-bg-indigo); color: var(--color-primary-dark);
  border-radius: 50px; font-size: 0.85rem; font-weight: 600;
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.7rem 1.6rem;
  border-radius: 50px; font-size: 0.9rem; font-weight: 500; text-decoration: none;
  transition: var(--transition); cursor: pointer; font-family: var(--font-sans); border: none;
}
.btn-primary { background: linear-gradient(135deg, var(--color-primary), var(--color-primary-mid)); color: #fff; border: 1px solid rgba(212,152,60,0.28); }
.btn-primary:hover { box-shadow: var(--shadow-gold); transform: translateY(-1px); }
.btn-outline { background: transparent; border: 1.5px solid var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-gold); color: var(--color-gold-dark); }

/* CTA box */
.cta-box {
  background: linear-gradient(135deg, var(--color-bg-indigo), var(--color-gold-pale));
  border: 1px solid rgba(49,46,129,0.1); border-radius: var(--radius-xl);
  padding: 2.5rem 2rem; text-align: center; margin: 3rem 0;
}
.cta-box h3 { color: var(--color-primary-dark); margin-bottom: 0.6rem; }
.cta-box p { margin-bottom: 1.2rem; }
.cta-box .contact-phone {
  font-family: var(--font-serif); font-size: 1.3rem; font-weight: 700;
  color: var(--color-gold-dark);
}

/* Footer */
.sub-footer {
  background: var(--color-deep); padding: 2rem 0; color: rgba(255,255,255,0.6);
  text-align: center; font-size: 0.85rem;
}
.sub-footer a { color: rgba(255,255,255,0.5); text-decoration: none; }
.sub-footer a:hover { color: var(--color-gold-light); }
.sub-footer .wechat { color: var(--color-gold-light); margin-top: 0.4rem; font-weight: 500; }

/* Watermark */
.sub-watermark {
  text-align: center; padding: 2rem 1rem; overflow: hidden;
  background: linear-gradient(180deg, #fff 0%, var(--color-bg-indigo) 40%, var(--color-primary-dark) 80%, var(--color-deep) 100%);
}
.sub-watermark-text {
  font-family: var(--font-sans); font-weight: 900; letter-spacing: 0.1em;
  font-size: clamp(2.5rem, 12vw, 8rem); line-height: 1; user-select: none;
  background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.22) 50%, rgba(255,255,255,0.06) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

/* Fade-in */
.fade-in { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Dynamic lines */
.dyn-line { position: absolute; overflow: hidden; pointer-events: none; z-index: 0; }
.dyn-line svg { width: 100%; height: 100%; }
.dyn-line path { fill: none; stroke-width: 1.4; stroke-dasharray: 6 4; animation: lineFlow 8s linear infinite; }
@keyframes lineFlow { 0% { stroke-dashoffset: 0; } 100% { stroke-dashoffset: 40; } }

@media (max-width: 768px) {
  .article { padding: 2rem 0 3rem; }
  .article-body { font-size: 0.95rem; }
  .card-grid { grid-template-columns: 1fr; }
  .service-section { padding: 1.5rem; }
}