@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

/* ============================================
   比亚迪股票 集群页面公共样式
   适用：byd-stock.html 及所有子页面
   风格参考：ai-comic.css (温暖红+奶油底)
   最后更新：2026-05-27
   ============================================ */

/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased;text-wrap:pretty}

/* === CSS Variables === */
:root{
  --red:#c0392b;
  --red-dark:#a93226;
  --primary:#c0392b;
  --primary-dark:#a93226;
  --accent:#f39c12;
  --red-light:#fde8e8;
  --bg-white:#fff;
  --bg-alt:#f5f0e8;
  --bg-dark:#2d2926;
  --text:#2d2926;
  --text-light:#7a746e;
  --text-muted:#7a746e;
  --border:#e8e4df;
  --shadow-sm:0 2px 8px rgba(0,0,0,0.06);
  --shadow-md:0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg:0 8px 32px rgba(0,0,0,0.12);
  --radius:10px;
  --radius-sm:6px;
  --max-width:1140px;
}

/* === Progress Bar === */
.progress-bar{position:fixed;top:0;left:0;height:3px;background:var(--primary);z-index:1000;transition:width 0.1s linear}

/* === Navigation === */
nav{position:fixed;top:0;left:0;width:100%;z-index:1000;background:rgba(255,255,255,0.96);backdrop-filter:blur(16px) saturate(180%);-webkit-backdrop-filter:blur(16px) saturate(180%);border-bottom:1.5px solid var(--border);height:60px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(16px,4vw,48px);box-shadow:0 1px 12px rgba(0,0,0,0.03)}
.nav-logo{display:flex;align-items:center;gap:8px;font-weight:900;font-size:18px;color:var(--red);text-decoration:none}
.nav-logo span{color:var(--text);font-weight:700}
.nav-links{display:flex;gap:8px;align-items:center}
.nav-links a{color:var(--muted);font-size:14px;font-weight:600;padding:6px 14px;border-radius:8px;transition:all .2s;white-space:nowrap;text-decoration:none}
.nav-links a:hover{color:var(--red);background:var(--red-light)}
.nav-cta{background:var(--red)!important;color:#fff!important;padding:8px 18px!important;border-radius:8px!important;font-weight:700!important;font-size:13px!important;transition:all .2s!important;box-shadow:0 2px 8px rgba(192,57,43,0.25)}
.nav-cta:hover{background:var(--red-dark)!important;transform:translateY(-1px)}
.hamburger{display:none;background:none;border:1.5px solid var(--border);font-size:14px;cursor:pointer;color:var(--text);font-weight:600;padding:6px 12px;border-radius:8px}

/* === Hero === */
.hero{text-align:center;padding:60px 24px 40px;max-width:var(--max-width);margin:0 auto}
.hero-emoji{font-size:3.5rem;margin-bottom:12px}
.hero h1{font-size:clamp(1.6rem,3.5vw,2.4rem);font-weight:800;line-height:1.4;margin-bottom:16px;color:var(--text)}
.hero h1 .red{color:var(--primary)}
.hero-sub{font-size:1.05rem;color:var(--text-light);max-width:700px;margin:0 auto 20px;line-height:1.7}
.hero-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:24px}
.hero-tag{background:#fff;border:1px solid var(--border);padding:6px 16px;border-radius:20px;font-size:0.85rem;color:var(--text-light)}
.hero-tag:hover{border-color:var(--primary);color:var(--primary)}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:28px}
.btn-primary{display:inline-block;background:var(--primary);color:#fff;font-weight:700;font-size:1.05rem;padding:14px 36px;border-radius:30px;text-decoration:none;transition:all 0.2s}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 20px rgba(192,57,43,0.25)}
.btn-secondary{display:inline-block;background:#fff;color:var(--primary);font-weight:600;font-size:1rem;padding:14px 36px;border-radius:30px;text-decoration:none;border:2px solid var(--primary);transition:all 0.2s}
.btn-secondary:hover{background:rgba(192,57,43,0.05)}

/* === Social Proof === */
.social-proof{display:flex;justify-content:center;gap:36px;flex-wrap:wrap}
.proof-item{text-align:center}
.proof-num{font-size:1.5rem;font-weight:800;color:var(--primary)}
.proof-label{font-size:0.82rem;color:var(--text-muted);margin-top:2px}

/* === Section Layout === */
.section{max-width:var(--max-width);margin:0 auto;padding:56px 24px}
.section-alt{background:var(--bg-alt)}
.section-white{background:var(--bg-white)}
.section-dark{background:var(--bg-dark);color:#fff}
.section-header{text-align:center;margin-bottom:40px}
.section-label{display:inline-block;background:rgba(192,57,43,0.08);color:var(--primary);font-size:0.82rem;font-weight:600;padding:4px 14px;border-radius:20px;margin-bottom:12px;text-transform:uppercase;letter-spacing:0.5px}
.section-title{font-size:clamp(1.3rem,2.5vw,1.7rem);font-weight:700;margin-bottom:8px;line-height:1.4}
.section-desc{color:var(--text-light);font-size:0.95rem;max-width:600px;margin:0 auto}

/* === Hub Grid & Cards === */
.hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.hub-card{background:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:all 0.25s;text-decoration:none;color:inherit;display:block;border:1px solid transparent}
.hub-card:hover{box-shadow:var(--shadow-md);border-color:var(--primary);transform:translateY(-2px)}
.hub-icon{font-size:2rem;margin-bottom:10px}
.hub-title{font-weight:700;font-size:1.05rem;margin-bottom:8px;color:var(--text);line-height:1.5}
.hub-desc{color:var(--text-light);font-size:0.88rem;line-height:1.6;margin-bottom:10px}
.hub-link{color:var(--primary);font-weight:600;font-size:0.88rem}

/* === Info Grid (data cards) === */
.info-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.info-card{background:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);text-align:center;border:1px solid var(--border)}
.info-card h3{font-size:0.95rem;font-weight:700;margin-bottom:8px;color:var(--text)}
.info-card .highlight{font-size:2rem;font-weight:800;color:var(--primary);display:block;margin:8px 0}
.info-card p{color:var(--text-light);font-size:0.85rem;line-height:1.6}

/* === Comparison Table === */
.comp-table{width:100%;border-collapse:collapse;margin:20px 0;font-size:0.92rem}
.comp-table th{background:var(--primary);color:#fff;padding:12px 16px;text-align:left;font-weight:600}
.comp-table td{padding:12px 16px;border-bottom:1px solid var(--border)}
.comp-table tr:nth-child(even){background:var(--bg-alt)}
.comp-table tr:hover{background:rgba(192,57,43,0.04)}

/* === FAQ === */
.faq-container{max-width:800px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border);padding:20px 0}
.faq-item:first-child{border-top:1px solid var(--border)}
.faq-q{font-weight:700;font-size:1.05rem;margin-bottom:8px;color:var(--text);line-height:1.5}
.faq-a{color:var(--text-light);font-size:0.95rem;line-height:1.75;padding-top:4px}
.faq-a strong{color:var(--text)}

/* === Final CTA === */
.final-cta{text-align:center;padding:56px 24px;background:linear-gradient(180deg,var(--bg-alt) 0%,#fff 50%,var(--bg-alt) 100%);color:var(--text)}
.final-cta .section-header{margin-bottom:16px}
.final-cta-title{font-size:clamp(1.3rem,2.5vw,1.7rem);font-weight:800;margin-bottom:8px;color:var(--text)}
.final-cta .section-desc{color:var(--text-light);margin-bottom:20px}
.btn-big{display:inline-block;background:var(--primary);color:#fff;font-weight:700;font-size:1.1rem;padding:16px 48px;border-radius:10px;text-decoration:none;transition:all 0.25s;box-shadow:0 4px 16px rgba(192,57,43,0.3)}
.btn-big:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 8px 28px rgba(192,57,43,0.35)}

/* === Footer === */
footer{text-align:center;padding:32px 24px;color:var(--text-muted);font-size:0.85rem;line-height:2}
footer a{color:var(--text-light);text-decoration:none;margin:0 8px;transition:color 0.2s}
footer a:hover{color:var(--primary)}

/* === Breadcrumb (sub-pages) === */
.breadcrumb{padding:16px 24px;max-width:var(--max-width);margin:0 auto;font-size:0.88rem;color:var(--text-muted)}
.breadcrumb a{color:var(--primary);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline}
.breadcrumb span{color:var(--text-muted)}

/* === Article Content (sub-pages) === */
.article-wrap{max-width:800px;margin:0 auto;padding:0 24px 40px}
.article-wrap h1{font-size:clamp(1.5rem,2.5vw,2rem);font-weight:800;margin-bottom:20px;line-height:1.4}
.article-wrap h2{font-size:clamp(1.2rem,2vw,1.5rem);font-weight:700;margin:36px 0 16px;line-height:1.4;border-left:4px solid var(--primary);padding-left:14px}
.article-wrap h3{font-size:1.1rem;font-weight:700;margin:24px 0 12px}
.article-wrap p{color:var(--text-light);font-size:0.98rem;line-height:1.85;margin-bottom:16px}
.article-wrap ul,.article-wrap ol{padding-left:24px;margin-bottom:16px}
.article-wrap li{color:var(--text-light);font-size:0.98rem;line-height:1.85;margin-bottom:8px}
.article-wrap li strong{color:var(--text)}
.article-wrap .highlight-box{background:rgba(192,57,43,0.05);border:1px solid rgba(192,57,43,0.15);border-radius:var(--radius);padding:20px 24px;margin:20px 0}
.article-wrap .highlight-box p{color:var(--text);margin:0}
.article-wrap .disclaimer-box{background:#fffbeb;border:1px solid #fde68a;border-radius:var(--radius);padding:16px 20px;margin:20px 0;font-size:0.9rem;color:#92400e;line-height:1.6}

/* === Inline CTA (sub-pages) === */
.inline-cta{text-align:center;padding:28px 24px;margin:28px 0;background:linear-gradient(135deg, rgba(192,57,43,0.06), rgba(192,57,43,0.12));border-radius:var(--radius)}
.inline-cta p{font-weight:600;font-size:1rem;margin-bottom:14px;color:var(--text)}
.inline-cta .btn-primary{font-size:0.95rem;padding:12px 30px}

/* === Related Links (sub-pages) === */
.related-section{margin:32px 0;padding:24px;background:var(--bg-alt);border-radius:var(--radius)}
.related-section h3{font-size:1rem;font-weight:700;margin-bottom:12px;color:var(--text)}
.related-section a{display:block;padding:6px 0;font-size:0.92rem;color:var(--primary);text-decoration:none;transition:color 0.2s}
.related-section a:hover{color:var(--primary-dark);text-decoration:underline}

/* === Back Link === */
.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--primary);text-decoration:none;font-weight:600;font-size:0.95rem;margin:20px 0;transition:color 0.2s}
.back-link:hover{color:var(--primary-dark)}

/* === Scroll Animation === */
.reveal{opacity:0;transform:translateY(20px);transition:opacity 0.6s ease,transform 0.6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* === Article Meta === */
.article-date{font-size:0.88rem;color:var(--text-muted);margin-bottom:24px}


/* === FAQ Accordion === */
.faq-accordion{display:grid;grid-template-columns:1fr 1fr;gap:16px;max-width:var(--max-width);margin:0 auto}
.faq-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:all 0.3s ease;box-shadow:var(--shadow-sm);align-self:start}
.faq-card:hover{border-color:var(--primary);box-shadow:var(--shadow-md)}
.faq-card-header{display:flex;align-items:center;gap:14px;padding:18px 22px;cursor:pointer;user-select:none;background:#fff;border:none;width:100%;text-align:left;font-family:inherit;transition:background 0.2s}
.faq-card-header:hover{background:var(--red-light)}
.faq-card-num{font-size:0.82rem;font-weight:700;color:var(--primary);opacity:0.5;min-width:24px}
.faq-card-q{flex:1;font-weight:700;font-size:1.02rem;color:var(--text);line-height:1.5}
.faq-card-arrow{flex-shrink:0;width:20px;height:20px;position:relative;transition:transform 0.3s ease}
.faq-card-arrow::before,.faq-card-arrow::after{content:'';position:absolute;background:var(--primary);border-radius:2px;transition:all 0.3s ease}
.faq-card-arrow::before{top:9px;left:0;width:20px;height:2px}
.faq-card-arrow::after{top:0;left:9px;width:2px;height:20px}
.faq-card-body{max-height:0;overflow:hidden;transition:max-height 0.4s ease,padding 0.3s ease}
.faq-card-a{padding:0 22px 22px 60px;color:var(--text-light);font-size:0.95rem;line-height:1.8}
.faq-card-a strong{color:var(--text)}
.faq-card-a a{color:var(--primary);font-weight:600;text-decoration:none}
.faq-card-a a:hover{text-decoration:underline}
/* Open state */
.faq-card.open .faq-card-body{max-height:400px;padding-bottom:4px}
.faq-card.open .faq-card-arrow{transform:rotate(45deg)}
.faq-card.open .faq-card-header{background:var(--red-light)}
.faq-card.open{border-color:var(--primary);box-shadow:var(--shadow-md)}

/* === Responsive: Tablet (768px) === */
@media (max-width:768px){
  .faq-accordion{grid-template-columns:1fr 1fr;gap:12px}
  .hub-grid,.info-grid{grid-template-columns:repeat(2,1fr)}
  .social-proof{gap:20px}
  .hero{padding:40px 20px 32px}
  .hero-emoji{font-size:2.8rem}
  .hamburger{display:block}
  .nav-links{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;flex-direction:column;padding:16px;border-bottom:2px solid var(--border);box-shadow:var(--shadow-md)}
  .nav-links.open{display:flex}
  .nav-links a{width:100%;padding:10px 16px;text-align:left}
}

/* === Responsive: Mobile (480px) === */
@media (max-width:480px){
  .faq-accordion{grid-template-columns:1fr;gap:10px}
  .hub-grid,.info-grid{grid-template-columns:1fr}
  .hero-tags{gap:6px}
  .hero-tag{font-size:0.78rem;padding:4px 12px}
  .social-proof{gap:12px}
  .article-wrap h1{font-size:1.4rem}
  .article-wrap h2{font-size:1.15rem}
  .comp-table{font-size:0.8rem}
  .comp-table th,.comp-table td{padding:8px 10px}
}