/* ===== CSS Variables ===== */
:root {
  --primary: #1DA1D5;
  --primary-dark: #0B3D5C;
  --primary-light: #E6F6FC;
  --accent: #0B6FA8;
  --text: #1A1A2E;
  --text-light: #5A6A7A;
  --text-muted: #8A96A6;
  --bg: #FFFFFF;
  --bg-alt: #F6FAFD;
  --bg-dark: #0B3D5C;
  --border: #E1EDF5;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(11,61,92,0.06);
  --shadow: 0 8px 30px rgba(11,61,92,0.1);
  --shadow-lg: 0 20px 60px rgba(11,61,92,0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 90px; }
body { font-family: var(--font); color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: var(--font); cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: var(--font); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-title { font-size: 2.4rem; font-weight: 700; text-align: center; margin-bottom: 16px; color: var(--text); }
.section-subtitle { font-size: 1.1rem; color: var(--text-light); text-align: center; max-width: 640px; margin: 0 auto 60px; }

/* ===== Navigation ===== */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.92); backdrop-filter: blur(20px); border-bottom: 1px solid transparent; transition: var(--transition); }
.navbar.scrolled { border-color: var(--border); box-shadow: var(--shadow-sm); }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; }
.logo img { height: 40px; width: auto; }
.logo span { font-size: 1.3rem; font-weight: 700; color: var(--primary-dark); }
.nav-links { display: flex; gap: 36px; }
.nav-links a { font-size: 0.95rem; font-weight: 500; color: var(--text-light); position: relative; padding: 4px 0; }
.nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px; background: var(--primary); transition: var(--transition); border-radius: 1px; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-cta { padding: 10px 24px; background: var(--primary); color: #fff; border-radius: 100px; font-size: 0.9rem; font-weight: 600; transition: var(--transition); }
.nav-cta:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.nav-actions { display: flex; align-items: center; gap: 14px; }
.lang-switch { display: inline-flex; align-items: center; gap: 6px; padding: 8px 15px; border: 1px solid var(--border); border-radius: 100px; font-size: 0.82rem; font-weight: 600; color: var(--text-light); white-space: nowrap; transition: var(--transition); }
.lang-switch:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.lang-switch svg { width: 14px; height: 14px; flex-shrink: 0; }
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.mobile-menu-btn span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }

/* ===== Hero ===== */
.hero { min-height: 100vh; display: flex; align-items: center; position: relative; background: var(--bg-dark); overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%231DA1D5' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E"); }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(29,161,213,0.15); border: 1px solid rgba(29,161,213,0.3); color: var(--accent); padding: 8px 20px; border-radius: 100px; font-size: 0.85rem; font-weight: 500; margin-bottom: 28px; }
.hero-badge svg { width: 16px; height: 16px; flex-shrink: 0; }
.hero h1 { font-size: 3.6rem; font-weight: 800; color: #fff; line-height: 1.15; margin-bottom: 20px; }
.hero h1 span { color: var(--accent); }
.hero-desc { font-size: 1.15rem; color: rgba(255,255,255,0.75); max-width: 520px; margin-bottom: 36px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: nowrap; align-items: center; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px; border-radius: 100px; font-size: 1rem; font-weight: 600; white-space: nowrap; transition: var(--transition); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(29,161,213,0.35); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.25); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.hero-visual { display: flex; justify-content: center; align-items: center; }
.hero-logo-img { max-width: 420px; width: 100%; filter: drop-shadow(0 20px 60px rgba(0,0,0,0.3)); }

/* ===== Hero · AI 智能体卡片（首页右侧） ===== */
.hero-ai-card { width: 100%; max-width: 420px; background: #fff; border-radius: 20px; padding: 26px 24px; box-shadow: 0 28px 70px rgba(0,0,0,0.28); }
.hero-ai-head { display: flex; align-items: center; gap: 13px; margin-bottom: 22px; }
.hero-ai-avatar { width: 46px; height: 46px; border-radius: 50%; background: var(--primary-light); color: var(--primary-dark); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 0.98rem; letter-spacing: 0.5px; flex-shrink: 0; }
.hero-ai-name { font-size: 1rem; font-weight: 700; color: var(--text); line-height: 1.35; }
.hero-ai-status { display: flex; align-items: center; gap: 6px; font-size: 0.78rem; color: #16A34A; margin-top: 3px; }
.hero-ai-status i { display: block; width: 7px; height: 7px; border-radius: 50%; background: #22C55E; }
.hero-ai-msg { background: #F4F6F8; border-radius: 14px; padding: 15px 17px; font-size: 0.88rem; color: var(--text); line-height: 1.75; margin-bottom: 16px; }
.hero-ai-input { display: flex; align-items: center; gap: 10px; background: #fff; border: 1.5px solid var(--border); border-radius: 100px; padding: 5px 5px 5px 18px; cursor: pointer; transition: var(--transition); }
.hero-ai-input:hover { border-color: var(--primary); box-shadow: 0 6px 20px rgba(29,161,213,0.16); }
.hero-ai-input span { flex: 1; font-size: 0.87rem; color: var(--text-muted); }
.hero-ai-send { width: 34px; height: 34px; border-radius: 50%; background: var(--primary); display: flex; align-items: center; justify-content: center; color: #fff; flex-shrink: 0; }
.hero-ai-send svg { width: 15px; height: 15px; margin-left: -1px; }

/* ===== Highlights ===== */
.highlights { background: var(--bg); padding: 80px 0; }
.hl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.hl-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 40px 32px; text-align: center; transition: var(--transition); }
.hl-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.hl-icon { width: 64px; height: 64px; margin: 0 auto 20px; background: var(--primary-light); border-radius: 16px; display: flex; align-items: center; justify-content: center; }
.hl-icon svg { width: 32px; height: 32px; color: var(--primary); }
.hl-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.hl-card p { font-size: 0.95rem; color: var(--text-light); line-height: 1.7; }

/* ===== Business Overview ===== */
.biz-overview { background: var(--bg-alt); }
.biz-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.biz-card { background: #fff; border-radius: var(--radius-lg); padding: 36px; border: 1px solid var(--border); transition: var(--transition); position: relative; overflow: hidden; }
.biz-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--primary); }
.biz-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--primary); opacity: 0; transition: var(--transition); }
.biz-card:hover::before { opacity: 1; }
.biz-num { font-size: 2.8rem; font-weight: 800; color: var(--primary); opacity: 0.15; line-height: 1; margin-bottom: 16px; }
.biz-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; }
.biz-card p { font-size: 0.95rem; color: var(--text-light); line-height: 1.8; }
.biz-card ul { margin-top: 16px; }
.biz-card ul li { font-size: 0.9rem; color: var(--text-light); padding: 6px 0; padding-left: 20px; position: relative; }
.biz-card ul li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* ===== CTA Section ===== */
.cta-section { background: var(--bg-dark); position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; top: -50%; right: -20%; width: 600px; height: 600px; background: radial-gradient(circle, rgba(29,161,213,0.15), transparent 70%); }
.cta-inner { position: relative; z-index: 1; text-align: center; }
.cta-section h2 { font-size: 2.6rem; font-weight: 800; color: #fff; margin-bottom: 16px; }
.cta-section p { font-size: 1.1rem; color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto 36px; }
.cta-btn { display: inline-flex; align-items: center; gap: 10px; padding: 16px 40px; background: var(--primary); color: #fff; border-radius: 100px; font-size: 1.05rem; font-weight: 600; transition: var(--transition); }
.cta-btn:hover { background: var(--accent); transform: translateY(-2px); box-shadow: 0 12px 40px rgba(29,161,213,0.4); }

/* ===== About Page ===== */
.about-hero { padding: 160px 0 80px; background: var(--bg-alt); }
.about-hero h1 { font-size: 3rem; font-weight: 800; text-align: center; margin-bottom: 16px; }
.about-hero p { font-size: 1.1rem; color: var(--text-light); text-align: center; max-width: 700px; margin: 0 auto; }

.mission-section { background: var(--bg); }
.mission-box { background: var(--primary-dark); border-radius: var(--radius-lg); padding: 60px; text-align: center; color: #fff; }
.mission-box h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 16px; }
.mission-box p { font-size: 1.15rem; color: rgba(255,255,255,0.8); max-width: 700px; margin: 0 auto; }

.founder-section { background: var(--bg-alt); }
.founder-grid { display: grid; grid-template-columns: 1fr; gap: 48px; align-items: center; background: #fff; border-radius: var(--radius-lg); padding: 48px; border: 1px solid var(--border); }
.founder-info { max-width: 860px; }
.founder-info h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: 8px; }
.founder-info .role { color: var(--primary); font-weight: 600; font-size: 1rem; margin-bottom: 20px; }
.founder-info p { color: var(--text-light); line-height: 1.8; margin-bottom: 20px; }
.founder-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.founder-tags span { background: var(--primary-light); color: var(--primary-dark); padding: 6px 16px; border-radius: 100px; font-size: 0.85rem; font-weight: 500; }

.timeline-section { background: var(--bg); }
.timeline { position: relative; padding-left: 40px; }
.timeline::before { content: ''; position: absolute; left: 10px; top: 0; bottom: 0; width: 2px; background: var(--border); }
.timeline-item { position: relative; padding-bottom: 40px; }
.timeline-item::before { content: ''; position: absolute; left: -36px; top: 4px; width: 20px; height: 20px; border-radius: 50%; background: var(--primary); border: 4px solid #fff; box-shadow: var(--shadow-sm); }
.timeline-item h4 { font-size: 1.1rem; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.timeline-item p { color: var(--text-light); font-size: 0.95rem; }

.biz-flow { background: var(--bg-alt); }
.flow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.flow-card { background: #fff; border-radius: var(--radius); padding: 36px 28px; text-align: center; border: 1px solid var(--border); position: relative; }
.flow-card .arrow { position: absolute; right: -18px; top: 50%; transform: translateY(-50%); width: 36px; height: 36px; background: var(--primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 1rem; z-index: 2; }
.flow-card:last-child .arrow { display: none; }
.flow-num { width: 48px; height: 48px; background: var(--primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; font-weight: 700; margin: 0 auto 16px; }
.flow-card h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.flow-card p { font-size: 0.9rem; color: var(--text-light); }

/* ===== Partner Page ===== */
.partner-hero { padding: 160px 0 80px; background: var(--bg-dark); text-align: center; color: #fff; }
.partner-hero h1 { font-size: 3rem; font-weight: 800; margin-bottom: 16px; }
.partner-hero p { font-size: 1.1rem; color: rgba(255,255,255,0.75); max-width: 680px; margin: 0 auto; }

.tiers-section { background: var(--bg); }
.tiers-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.tier-card { background: #fff; border-radius: var(--radius-lg); border: 2px solid var(--border); padding: 40px 28px; text-align: center; transition: var(--transition); position: relative; overflow: hidden; }
.tier-card:hover { transform: translateY(-6px); border-color: var(--primary); box-shadow: var(--shadow-lg); }
.tier-card.featured { border-color: var(--primary); }
.tier-card.featured::before { content: '推荐'; position: absolute; top: 16px; right: -40px; width: 140px; background: var(--primary); color: #fff; font-size: 0.75rem; font-weight: 700; padding: 6px 0; transform: rotate(45deg); }
.tier-card .percent { font-size: 3.2rem; font-weight: 800; color: var(--primary); line-height: 1; margin-bottom: 8px; }
.tier-card .percent-label { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 20px; }
.tier-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 20px; }
.tier-card ul { text-align: left; margin-bottom: 28px; }
.tier-card ul li { font-size: 0.9rem; color: var(--text-light); padding: 8px 0; padding-left: 24px; position: relative; border-bottom: 1px solid var(--border); }
.tier-card ul li:last-child { border-bottom: none; }
.tier-card ul li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.tier-btn { display: block; width: 100%; padding: 14px; background: var(--primary); color: #fff; border-radius: 100px; font-size: 0.95rem; font-weight: 600; transition: var(--transition); }
.tier-btn:hover { background: var(--primary-dark); }

.income-section { background: var(--bg-alt); }
.income-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.income-table th, .income-table td { padding: 16px 20px; text-align: center; font-size: 0.95rem; }
.income-table th { background: var(--primary-dark); color: #fff; font-weight: 600; }
.income-table tr:nth-child(even) { background: var(--bg-alt); }
.income-table td { color: var(--text-light); border-bottom: 1px solid var(--border); }
.income-table .highlight { color: var(--primary); font-weight: 700; }
.income-note { margin-top: 16px; font-size: 0.85rem; color: var(--text-muted); text-align: center; }

.process-section { background: var(--bg); }
.process-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.process-step { text-align: center; position: relative; }
.process-step .num { width: 56px; height: 56px; background: var(--primary); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; font-weight: 700; margin: 0 auto 14px; position: relative; z-index: 1; }
.process-step::after { content: ''; position: absolute; top: 28px; left: 60%; width: calc(100% - 20px); height: 2px; background: var(--border); z-index: 0; }
.process-step:last-child::after { display: none; }
.process-step h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 6px; }
.process-step p { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }

.apply-section { background: var(--bg-alt); }
.apply-form { max-width: 720px; margin: 0 auto; background: #fff; border-radius: var(--radius-lg); padding: 48px; border: 1px solid var(--border); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 600; color: var(--text); margin-bottom: 8px; }
.form-group label .required { color: #E74C3C; margin-left: 2px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px 18px; border: 1px solid var(--border); border-radius: 10px; font-size: 0.95rem; color: var(--text); background: #fff; transition: var(--transition); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(29,161,213,0.1); }
.form-group textarea { min-height: 120px; resize: vertical; }
.form-submit { width: 100%; padding: 16px; background: var(--primary); color: #fff; border-radius: 10px; font-size: 1rem; font-weight: 600; transition: var(--transition); }
.form-submit:hover { background: var(--primary-dark); transform: translateY(-1px); }
.form-error { color: #E74C3C; font-size: 0.85rem; margin-top: 6px; display: none; }
.form-success { background: #D4EDDA; color: #155724; padding: 16px; border-radius: 10px; text-align: center; font-weight: 500; display: none; }

/* ===== Contact Page ===== */
.contact-hero { padding: 160px 0 80px; background: var(--bg-alt); }
.contact-hero h1 { font-size: 3rem; font-weight: 800; text-align: center; margin-bottom: 16px; }
.contact-hero p { font-size: 1.1rem; color: var(--text-light); text-align: center; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 24px; }
.contact-item { display: flex; gap: 16px; margin-bottom: 24px; }
.contact-item-icon { width: 48px; height: 48px; background: var(--primary-light); border-radius: 12px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact-item-icon svg { width: 22px; height: 22px; color: var(--primary); }
.contact-item h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.contact-item p { font-size: 0.95rem; color: var(--text-light); }

/* ===== Footer ===== */
.footer { background: var(--bg-dark); color: rgba(255,255,255,0.7); padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .logo img { height: 36px; }
.footer-brand .logo span { color: #fff; }
.footer-brand p { font-size: 0.9rem; line-height: 1.8; max-width: 300px; }
.footer-col h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: 20px; }
.footer-col a { display: block; font-size: 0.9rem; padding: 6px 0; color: rgba(255,255,255,0.6); }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem; color: rgba(255,255,255,0.5); }
.footer-bottom a { color: inherit; text-decoration: none; }   /* 备案号链接继承页脚色 */
.footer-bottom a:hover { text-decoration: underline; }

/* ===== Scroll Animations ===== */
.reveal { opacity: 0; transform: translateY(40px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; gap: 40px; }
  .hero h1 { font-size: 2.8rem; }
  .hero-desc { margin: 0 auto 36px; }
  .hero-visual { order: 0; }
  .hero-logo-img { max-width: 300px; }
  .hero-ai-card { margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .process-grid { grid-template-columns: repeat(3, 1fr); }
  .process-step:nth-child(3)::after { display: none; }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .mobile-menu-btn { display: flex; }
  .hero { padding: 120px 0 60px; min-height: auto; }
  .hero h1 { font-size: 2.2rem; }
  .hero-content { min-width: 0; }
  .hero-badge { max-width: 100%; font-size: 0.75rem; padding: 7px 14px; line-height: 1.5; }
  .hero-btns { flex-wrap: wrap; justify-content: center; }
  .hero-ai-card { max-width: 100%; padding: 20px 18px; }
  .section { padding: 60px 0; }
  .section-title { font-size: 1.8rem; }
  .hl-grid, .biz-grid, .tiers-grid, .flow-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: repeat(2, 1fr); }
  .process-step:nth-child(2)::after, .process-step:nth-child(4)::after { display: none; }
  .form-row { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .income-table { font-size: 0.8rem; }
  .income-table th, .income-table td { padding: 10px 8px; }
  .mission-box { padding: 36px 24px; }
  .apply-form { padding: 28px 20px; }
}

/* Mobile Menu */
.mobile-nav { display: none; position: fixed; top: 72px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 20px 24px; box-shadow: var(--shadow); z-index: 999; }
.mobile-nav.active { display: block; }
.mobile-nav a { display: block; padding: 14px 0; font-size: 1rem; font-weight: 500; color: var(--text); border-bottom: 1px solid var(--border); }
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav .mobile-cta { display: block; margin-top: 16px; padding: 14px; background: var(--primary); color: #fff; text-align: center; border-radius: 100px; font-weight: 600; border-bottom: none; }
.mobile-nav .mobile-lang { display: inline-flex; align-items: center; gap: 6px; margin-top: 14px; padding: 8px 0; font-size: 0.9rem; font-weight: 600; color: var(--primary); border-bottom: none; }
.mobile-nav .mobile-lang::before { content: '🌐'; font-size: 0.95rem; }

/* ============================================================
   V2 新增组件：权威资质 / 专家顾问 / FAQ / 知识讲堂 / 智能体问答
   ============================================================ */

/* ===== 通用内页 Hero ===== */
.page-hero { padding: 160px 0 70px; background: var(--bg-alt); text-align: center; }
.page-hero h1 { font-size: 2.8rem; font-weight: 800; margin-bottom: 16px; }
.page-hero p { font-size: 1.08rem; color: var(--text-light); max-width: 780px; margin: 0 auto; }
.breadcrumb { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 18px; }
.breadcrumb a { color: var(--primary); }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 8px; }

/* ===== 权威资质与合作伙伴 ===== */
.cert-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.cert-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition); display: flex; flex-direction: column; }
.cert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.cert-img { background: linear-gradient(135deg, #FBF7EC, #EFE3C8); display: flex; align-items: center; justify-content: center; padding: 24px; min-height: 240px; }
.cert-img img { max-height: 220px; width: auto; border-radius: 8px; box-shadow: var(--shadow); }
.cert-body { padding: 26px 28px; flex: 1; }
.cert-badge { display: inline-block; font-size: 0.75rem; font-weight: 700; color: var(--primary-dark); background: var(--primary-light); padding: 4px 12px; border-radius: 100px; margin-bottom: 12px; }
.cert-body h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; line-height: 1.5; }
.cert-body p { font-size: 0.92rem; color: var(--text-light); line-height: 1.75; }
.cert-meta { margin-top: 14px; font-size: 0.82rem; color: var(--text-muted); border-top: 1px dashed var(--border); padding-top: 12px; }
.cert-chips { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 24px; }
.cert-chip { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px 20px; text-align: center; font-size: 0.94rem; font-weight: 600; color: var(--primary-dark); transition: var(--transition); }
.cert-chip:hover { border-color: var(--primary); box-shadow: var(--shadow-sm); transform: translateY(-3px); }
.cert-chip small { display: block; font-weight: 400; color: var(--text-muted); font-size: 0.8rem; margin-top: 8px; line-height: 1.6; }

/* ===== 专家顾问 ===== */
.expert-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.expert-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 36px; transition: var(--transition); }
.expert-card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary); transform: translateY(-4px); }
.expert-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 6px; }
.expert-card .expert-role { color: var(--primary); font-weight: 600; font-size: 0.92rem; margin-bottom: 14px; }
.expert-card p { font-size: 0.93rem; color: var(--text-light); line-height: 1.8; }
.expert-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.expert-tags span { background: var(--primary-light); color: var(--primary-dark); padding: 5px 14px; border-radius: 100px; font-size: 0.8rem; font-weight: 500; }
.expert-featured { border: 2px solid var(--primary); position: relative; margin-top: 14px; }
.expert-featured::before { content: '专家顾问'; position: absolute; top: -13px; left: 32px; background: var(--primary); color: #fff; font-size: 0.75rem; font-weight: 700; padding: 4px 14px; border-radius: 100px; }

/* ===== 老师推荐（首页三卡） ===== */
.teacher-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.teacher-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 34px 26px; text-align: center; transition: var(--transition); display: flex; flex-direction: column; }
.teacher-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.teacher-card h4 { font-size: 1.08rem; font-weight: 700; margin-bottom: 6px; }
.teacher-card .t-role { color: var(--primary); font-size: 0.86rem; font-weight: 600; margin-bottom: 14px; }
.teacher-card p { font-size: 0.88rem; color: var(--text-light); line-height: 1.75; flex: 1; }
.teacher-rec { margin-top: 16px; font-size: 0.82rem; color: var(--primary-dark); background: var(--primary-light); border-radius: 10px; padding: 10px 12px; line-height: 1.6; text-align: left; }

/* ===== FAQ 折叠问答 ===== */
.faq-list { max-width: 880px; margin: 0 auto; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 14px; overflow: hidden; transition: var(--transition); }
.faq-item[open] { border-color: var(--primary); box-shadow: var(--shadow-sm); }
.faq-item summary { list-style: none; cursor: pointer; padding: 20px 60px 20px 24px; font-size: 1rem; font-weight: 600; color: var(--text); position: relative; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; position: absolute; right: 22px; top: 50%; transform: translateY(-50%); width: 26px; height: 26px; border-radius: 50%; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 1.15rem; font-weight: 700; line-height: 1; transition: var(--transition); }
.faq-item[open] summary::after { content: '−'; background: var(--primary); color: #fff; }
.faq-item[open] summary { color: var(--primary-dark); }
.faq-answer { padding: 18px 24px 22px; font-size: 0.94rem; color: var(--text-light); line-height: 1.85; border-top: 1px dashed var(--border); }
.faq-answer p + p { margin-top: 10px; }
.faq-answer strong { color: var(--primary-dark); }

/* ===== 知识讲堂 ===== */
.kb-tabs { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 44px; }
.kb-tab { padding: 9px 22px; border-radius: 100px; border: 1px solid var(--border); background: #fff; font-size: 0.9rem; font-weight: 500; color: var(--text-light); transition: var(--transition); }
.kb-tab.active, .kb-tab:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.kb-cat-block { margin-bottom: 72px; scroll-margin-top: 100px; }
.kb-cat-block > h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 8px; }
.kb-cat-block > .kb-cat-desc { color: var(--text-light); font-size: 0.95rem; margin-bottom: 28px; }
.kb-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.kb-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px 26px; transition: var(--transition); display: flex; flex-direction: column; }
.kb-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.kb-cat { display: inline-block; font-size: 0.75rem; font-weight: 700; color: var(--primary); background: var(--primary-light); padding: 4px 12px; border-radius: 100px; margin-bottom: 14px; align-self: flex-start; }
.kb-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; line-height: 1.55; }
.kb-card p { font-size: 0.9rem; color: var(--text-light); line-height: 1.78; flex: 1; }
.kb-meta { margin-top: 18px; padding-top: 14px; border-top: 1px dashed var(--border); font-size: 0.8rem; color: var(--text-muted); display: flex; justify-content: space-between; gap: 10px; }

/* 知识讲堂 · 深度文章 */
.kb-article { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 42px; margin-bottom: 26px; scroll-margin-top: 100px; }
.kb-article h3 { font-size: 1.4rem; font-weight: 700; margin-bottom: 8px; line-height: 1.5; }
.kb-article .kb-art-meta { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 22px; padding-bottom: 16px; border-bottom: 1px dashed var(--border); }
.kb-article p { font-size: 0.96rem; color: var(--text-light); line-height: 1.95; margin-bottom: 14px; }
.kb-article h4 { font-size: 1.04rem; font-weight: 700; color: var(--primary-dark); margin: 24px 0 10px; }
.kb-article ul { margin: 0 0 16px; }
.kb-article ul li { font-size: 0.94rem; color: var(--text-light); line-height: 1.92; padding-left: 22px; position: relative; }
.kb-article ul li::before { content: '▸'; position: absolute; left: 2px; color: var(--primary); font-weight: 700; }
.kb-article strong { color: var(--primary-dark); }
.kb-tip { background: var(--primary-light); border-left: 4px solid var(--primary); border-radius: 10px; padding: 18px 22px; font-size: 0.93rem; color: var(--primary-dark); line-height: 1.85; margin: 20px 0; }

/* ===== 智能体问答（浮动窗） ===== */
.ai-chat-fab { position: fixed; right: 26px; bottom: 26px; z-index: 1200; width: 62px; height: 62px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; display: flex; align-items: center; justify-content: center; box-shadow: 0 12px 34px rgba(29,161,213,0.45); transition: var(--transition); }
.ai-chat-fab:hover { transform: scale(1.07); }
.ai-chat-fab svg { width: 28px; height: 28px; }
.ai-chat-fab .fab-pulse { position: absolute; top: 5px; right: 5px; width: 12px; height: 12px; border-radius: 50%; background: #FF5A5F; border: 2px solid #fff; }
.ai-chat-fab.hidden { opacity: 0; pointer-events: none; transform: scale(0.6); }
.ai-chat-panel { position: fixed; right: 26px; bottom: 26px; z-index: 1201; width: 392px; max-width: calc(100vw - 32px); height: 620px; max-height: calc(100vh - 56px); background: #fff; border-radius: 20px; box-shadow: 0 24px 70px rgba(11,61,92,0.28); display: flex; flex-direction: column; overflow: hidden; opacity: 0; pointer-events: none; transform: translateY(20px) scale(0.97); transition: var(--transition); }
.ai-chat-panel.open { opacity: 1; pointer-events: auto; transform: none; }
.ai-chat-head { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: #fff; padding: 16px 18px; display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; }
.ai-chat-head-info { display: flex; align-items: center; gap: 12px; }
.ai-chat-avatar { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.18); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; }
.ai-chat-head-info strong { display: block; font-size: 0.98rem; }
.ai-chat-head-info span { font-size: 0.76rem; color: rgba(255,255,255,0.78); }
.ai-chat-close { color: #fff; font-size: 1.5rem; line-height: 1; padding: 2px 8px; border-radius: 8px; }
.ai-chat-close:hover { background: rgba(255,255,255,0.15); }
.ai-chat-body { flex: 1; overflow-y: auto; padding: 20px; background: var(--bg-alt); }
.ai-msg { display: flex; margin-bottom: 16px; }
.ai-msg .bubble { max-width: 86%; padding: 12px 16px; border-radius: 14px; font-size: 0.9rem; line-height: 1.72; white-space: pre-wrap; word-break: break-word; }
.ai-msg.bot .bubble { background: #fff; color: var(--text); border-bottom-left-radius: 4px; box-shadow: var(--shadow-sm); }
.ai-msg.user { justify-content: flex-end; }
.ai-msg.user .bubble { background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.ai-chat-quick { padding: 0 16px 12px; display: flex; gap: 8px; flex-wrap: wrap; background: var(--bg-alt); flex-shrink: 0; }
.ai-qchip { background: #fff; border: 1px solid var(--border); color: var(--primary-dark); font-size: 0.82rem; padding: 7px 14px; border-radius: 100px; transition: var(--transition); }
.ai-qchip:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.ai-chat-input { display: flex; gap: 10px; padding: 14px 16px; background: #fff; border-top: 1px solid var(--border); flex-shrink: 0; }
.ai-chat-input input { flex: 1; border: 1px solid var(--border); border-radius: 100px; padding: 12px 18px; font-size: 0.9rem; min-width: 0; }
.ai-chat-input input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(29,161,213,0.1); }
.ai-chat-input button { background: var(--primary); color: #fff; border-radius: 100px; padding: 0 22px; font-size: 0.9rem; font-weight: 600; }
.ai-chat-input button:hover { background: var(--primary-dark); }
.ai-typing { display: inline-flex; gap: 4px; align-items: center; }
.ai-typing i { width: 7px; height: 7px; border-radius: 50%; background: var(--primary); opacity: 0.4; animation: aiBlink 1.2s infinite; }
.ai-typing i:nth-child(2) { animation-delay: 0.2s; }
.ai-typing i:nth-child(3) { animation-delay: 0.4s; }
@keyframes aiBlink { 0%, 80%, 100% { opacity: 0.25; transform: translateY(0); } 40% { opacity: 1; transform: translateY(-3px); } }

/* 首页智能体问答入口区 */
.ai-entry { background: linear-gradient(135deg, var(--primary-dark) 0%, #12557F 100%); border-radius: var(--radius-lg); padding: 56px; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 44px; align-items: center; color: #fff; position: relative; overflow: hidden; }
.ai-entry::before { content: ''; position: absolute; top: -40%; right: -10%; width: 480px; height: 480px; background: radial-gradient(circle, rgba(0,194,203,0.22), transparent 70%); }
.ai-entry h2 { font-size: 2rem; font-weight: 800; margin-bottom: 14px; position: relative; }
.ai-entry p { color: rgba(255,255,255,0.78); font-size: 1rem; line-height: 1.8; margin-bottom: 26px; position: relative; }
.ai-entry-btn { display: inline-flex; align-items: center; gap: 9px; background: #fff; color: var(--primary-dark); padding: 14px 30px; border-radius: 100px; font-weight: 700; font-size: 0.98rem; position: relative; transition: var(--transition); }
.ai-entry-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(0,0,0,0.25); }
.ai-entry-demo { position: relative; }
.ai-entry-bubble { background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.18); border-radius: 14px; padding: 14px 18px; font-size: 0.88rem; margin-bottom: 12px; line-height: 1.6; }
.ai-entry-bubble.me { background: rgba(0,194,203,0.22); border-color: rgba(0,194,203,0.35); margin-left: 44px; }

/* ===== V2 响应式 ===== */
@media (max-width: 1024px) {
  .nav-links { gap: 22px; }
  .nav-links a { font-size: 0.88rem; }
  .cert-grid, .expert-grid, .teacher-grid, .kb-grid { grid-template-columns: 1fr 1fr; }
  .cert-chips { grid-template-columns: 1fr 1fr; }
  .ai-entry { grid-template-columns: 1fr; padding: 42px; }
}
@media (max-width: 768px) {
  .page-hero { padding: 130px 0 50px; }
  .page-hero h1 { font-size: 2rem; }
  .cert-grid, .expert-grid, .teacher-grid, .kb-grid, .cert-chips { grid-template-columns: 1fr; }
  .expert-card { padding: 30px 24px; }
  .expert-tags { justify-content: flex-start; }
  .ai-entry { padding: 32px 24px; gap: 28px; }
  .ai-entry h2 { font-size: 1.55rem; }
  .ai-chat-panel { right: 16px; left: 16px; bottom: 16px; width: auto; height: 72vh; }
  .ai-chat-fab { right: 18px; bottom: 18px; width: 56px; height: 56px; }
  .kb-tab { font-size: 0.84rem; padding: 8px 16px; }
}

/* ============================================================
   V3 新增：英文版排版 / 移动端加固 / 小屏适配
   ============================================================ */

/* ===== 布局防溢出基线 ===== */
.logo, .nav-actions { flex-shrink: 0; }
.nav-links { min-width: 0; }
body { overflow-wrap: break-word; }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; }

/* ===== 英文版排版（英文字体栈 + 标题字号收紧） ===== */
html[lang="en"] {
  --font: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}
html[lang="en"] .hero-btns { flex-wrap: wrap; }
html[lang="en"] .hero h1 { font-size: 3.05rem; letter-spacing: -0.022em; line-height: 1.12; }
html[lang="en"] .hero-desc { font-size: 1.1rem; }
html[lang="en"] .section-title { letter-spacing: -0.018em; }
html[lang="en"] .nav-links { gap: 26px; }
html[lang="en"] .cta-section h2 { font-size: 2.35rem; letter-spacing: -0.018em; }
html[lang="en"] .page-hero h1,
html[lang="en"] .about-hero h1,
html[lang="en"] .partner-hero h1,
html[lang="en"] .contact-hero h1 { font-size: 2.6rem; letter-spacing: -0.018em; line-height: 1.2; }
html[lang="en"] .tier-card .percent { font-size: 2.4rem; letter-spacing: -0.02em; }
html[lang="en"] .teacher-rec,
html[lang="en"] .cert-meta { letter-spacing: 0; }
/* 用 CSS 生成的角标文案需要按语言覆盖（否则英文页会露出中文） */
html[lang="en"] .tier-card.featured::before { content: 'Popular'; }
html[lang="en"] .expert-featured::before { content: 'Expert Advisor'; }

/* 中等宽度：中英文导航都需要收窄，避免按钮被挤出 */
@media (max-width: 1180px) {
  .nav-links { gap: 20px; }
  .nav-links a { font-size: 0.88rem; }
  html[lang="en"] .nav-links { gap: 16px; }
  html[lang="en"] .nav-links a { font-size: 0.85rem; }
}

@media (max-width: 1024px) {
  html[lang="en"] .hero h1 { font-size: 2.45rem; }
}

/* ===== 移动端加固（≤768px）=====
   1) 表单控件 16px 起，避免 iOS Safari 聚焦时自动放大页面
   2) 表格改为容器内横向滚动，不再压扁文字
   3) 页脚版权区改纵向居中                                  */
@media (max-width: 768px) {
  .form-group input, .form-group select, .form-group textarea,
  .ai-chat-input input, .ai-chat-input button { font-size: 16px; }
  .income-table { min-width: 560px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .hero-ai-msg { font-size: 0.9rem; }
  html[lang="en"] .hero h1 { font-size: 2.05rem; }
  html[lang="en"] .section-title { font-size: 1.62rem; }
  html[lang="en"] .page-hero h1,
  html[lang="en"] .about-hero h1,
  html[lang="en"] .partner-hero h1,
  html[lang="en"] .contact-hero h1 { font-size: 1.85rem; }
  html[lang="en"] .cta-section h2 { font-size: 1.68rem; }
}

/* ===== 小屏手机（≤480px）===== */
@media (max-width: 480px) {
  .container { padding: 0 18px; }
  .nav-container { padding: 0 16px; gap: 8px; }
  .logo img { height: 34px; }
  .logo span { font-size: 1.1rem; }
  .nav-actions { gap: 8px; }
  .lang-switch { padding: 7px 12px; font-size: 0.78rem; }
  .section { padding: 44px 0; }
  .section-title { font-size: 1.5rem; }
  .section-subtitle { font-size: 0.96rem; margin-bottom: 34px; }

  .hero { padding: 104px 0 48px; }
  .hero h1 { font-size: 1.85rem; }
  .hero-desc { font-size: 0.98rem; margin-bottom: 26px; }
  .hero-btns { gap: 10px; }
  .btn { padding: 12px 20px; font-size: 0.9rem; }
  .hero-ai-card { padding: 18px 16px; border-radius: 16px; }

  .page-hero { padding: 112px 0 40px; }
  .page-hero h1 { font-size: 1.62rem; }
  .about-hero, .partner-hero, .contact-hero { padding: 124px 0 52px; }
  .about-hero h1, .partner-hero h1, .contact-hero h1 { font-size: 1.8rem; }
  .cta-section h2 { font-size: 1.6rem; }
  .cta-section p { font-size: 1rem; }

  .mission-box { padding: 30px 20px; }
  .mission-box h2 { font-size: 1.5rem; }
  .founder-grid { padding: 26px 20px; }
  .timeline { padding-left: 28px; }
  .timeline-item::before { left: -26px; width: 16px; height: 16px; }
  .flow-card .arrow { display: none; }

  .kb-article { padding: 24px 18px; border-radius: 14px; }
  .kb-article h3 { font-size: 1.16rem; }
  .kb-article p, .kb-article ul li { font-size: 0.92rem; }
  .kb-tip { padding: 15px 16px; font-size: 0.9rem; }
  .kb-cat-block { margin-bottom: 52px; }

  .ai-entry { padding: 26px 18px; }
  .ai-entry h2 { font-size: 1.4rem; }
  .ai-entry-bubble { font-size: 0.85rem; padding: 12px 14px; }
  .ai-entry-bubble.me { margin-left: 18px; }

  .apply-form { padding: 22px 16px; }
  .form-group input, .form-group select, .form-group textarea { padding: 12px 14px; }
  .cert-img { min-height: 180px; padding: 16px; }
  .cert-img img { max-height: 160px; }
  .cert-body { padding: 20px 18px; }
  .income-table { min-width: 520px; }

  .footer { padding: 44px 0 20px; }
  .footer-brand p { max-width: 100%; }

  /* AI 对话面板在小屏转为全屏，避免键盘弹出后输入框被遮挡 */
  .ai-chat-panel { top: 0; right: 0; bottom: 0; left: 0; width: auto; height: auto; max-height: none; border-radius: 0; }
  .ai-chat-body { padding: 16px 14px; }
  .ai-msg .bubble { max-width: 92%; }
  .ai-qchip { font-size: 0.78rem; padding: 6px 12px; }
  .ai-chat-fab { right: 14px; bottom: 14px; width: 54px; height: 54px; }
  .ai-chat-fab svg { width: 24px; height: 24px; }

  html[lang="en"] .hero h1 { font-size: 1.82rem; }
  html[lang="en"] .section-title { font-size: 1.48rem; }
  html[lang="en"] .page-hero h1,
  html[lang="en"] .about-hero h1,
  html[lang="en"] .partner-hero h1,
  html[lang="en"] .contact-hero h1 { font-size: 1.6rem; }
  html[lang="en"] .cta-section h2 { font-size: 1.5rem; }
  html[lang="en"] .tier-card .percent { font-size: 2rem; }
}

/* ==================================================================
   GEO 自动发布内容
   以下元素由服务端 Markdown 渲染器产出（文章页 /knowledge/<slug>），
   以及知识讲堂的「最新发布」列表。全部沿用上方已有的设计变量。
   ================================================================== */
.kb-article ol { margin: 0 0 16px; list-style: none; counter-reset: kb-ol; }
.kb-article ol li { font-size: 0.94rem; color: var(--text-light); line-height: 1.92; padding-left: 28px; position: relative; margin-bottom: 6px; counter-increment: kb-ol; }
.kb-article ol li::before { content: counter(kb-ol); position: absolute; left: 0; top: 0.42em; width: 18px; height: 18px; line-height: 18px; text-align: center; font-size: 0.7rem; font-weight: 700; color: #fff; background: var(--primary); border-radius: 50%; }
.kb-article ul li { margin-bottom: 6px; }

.kb-article blockquote { margin: 18px 0; padding: 16px 22px; background: var(--bg-alt); border-left: 4px solid var(--accent); border-radius: 0 10px 10px 0; font-size: 0.94rem; color: var(--text-light); line-height: 1.9; }
.kb-article blockquote p { margin-bottom: 0; }

/* 文章配图：GEO 发布通道的 Markdown 图片（块级 figure + 图注 / 行内 img） */
.kb-article .kb-figure { margin: 22px 0 26px; text-align: center; }
.kb-article .kb-figure img { display: block; width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--border); box-shadow: 0 8px 24px rgba(15, 42, 66, 0.09); }
.kb-article .kb-figure figcaption { margin-top: 10px; font-size: 0.84rem; color: var(--text-muted); line-height: 1.72; }
.kb-article .kb-inline-img { max-width: 100%; height: auto; border-radius: 10px; vertical-align: middle; }

.kb-article a { color: var(--primary); font-weight: 600; border-bottom: 1px solid rgba(29,161,213,0.35); }
.kb-article a:hover { border-bottom-color: var(--primary); }
.kb-article hr { border: none; border-top: 1px dashed var(--border); margin: 30px 0; }

.kb-article code { background: var(--primary-light); color: var(--primary-dark); padding: 2px 6px; border-radius: 6px; font-size: 0.88em; font-family: Consolas, Monaco, "Courier New", monospace; }
.kb-article pre { background: var(--bg-dark); color: var(--primary-light); padding: 18px 20px; border-radius: var(--radius); overflow-x: auto; margin: 18px 0; }
.kb-article pre code { background: none; color: inherit; padding: 0; font-size: 0.86rem; line-height: 1.72; }

/* 表格：外层容器负责横向滚动，避免长表格撑破移动端布局 */
.kb-table-wrap { overflow-x: auto; margin: 18px 0; -webkit-overflow-scrolling: touch; }
.kb-article table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 420px; }
.kb-article th { background: var(--primary-light); color: var(--primary-dark); font-weight: 700; text-align: left; padding: 11px 14px; border: 1px solid var(--border); white-space: nowrap; }
.kb-article td { padding: 11px 14px; border: 1px solid var(--border); color: var(--text-light); line-height: 1.75; }
.kb-article tbody tr:nth-child(even) { background: var(--bg-alt); }

/* 知识讲堂「最新发布」列表 */
.geo-post-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.geo-post { display: block; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px 26px; transition: var(--transition); }
.geo-post:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.geo-post h3 { font-size: 1.08rem; font-weight: 700; line-height: 1.55; margin-bottom: 10px; color: var(--text); }
.geo-post p { font-size: 0.9rem; color: var(--text-light); line-height: 1.8; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.geo-post-meta { display: flex; align-items: center; gap: 10px; font-size: 0.8rem; color: var(--text-muted); padding-top: 14px; border-top: 1px dashed var(--border); }
.geo-tag { display: inline-block; font-size: 0.72rem; font-weight: 700; color: var(--primary); background: var(--primary-light); padding: 3px 10px; border-radius: 100px; }

@media (max-width: 900px) {
  .geo-post-grid { grid-template-columns: 1fr; }
  .kb-article { padding: 26px 20px; }
  .kb-article th, .kb-article td { padding: 9px 11px; font-size: 0.86rem; }
}



/* ==== SITE-BC-THEME BEGIN · 全站 B+C 主题（深藏蓝 #0a2540 + 金 #1DA1D5；删本块即还原） ==== */

/* 1. 导航：深藏蓝 主色 + 金焦点 */
.nav-links a { color: #46586d; }
.nav-links a:hover { color: #0a2540; }
.nav-links a.active { color: #0a2540; font-weight: 700; }
.nav-links a.active::after, .nav-links a:hover::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -6px;
  height: 2px; background: #1DA1D5;
}
.nav-cta { background: #0a2540; color: #fff; }
.nav-cta:hover { background: #1DA1D5; color: #0a2540; transform: none; box-shadow: 0 8px 22px rgba(10,37,64,.22); }

/* 2. 首页 Hero（深底）：深藏蓝 + 金徽章 */
.hero { background: linear-gradient(160deg, #0a2540 0%, #123a63 100%); }
.hero-badge { background: rgba(201,162,39,.14); border: 1px solid rgba(201,162,39,.45); color: #7CC4E8; }
.hero-ai-card { border: 1px solid rgba(255,255,255,.14); background: rgba(255,255,255,.06); border-radius: 10px; }
.hero-ai-status i { background: #1DA1D5; }
.btn-primary, .form-submit { background: #1DA1D5; color: #0a2540; }
.btn-primary:hover, .form-submit:hover { background: #0a2540; color: #fff; box-shadow: 0 12px 34px rgba(10,37,64,.35); }
.btn-outline { border: 1px solid rgba(255,255,255,.55); color: #fff; }
.btn-outline:hover { border-color: #1DA1D5; color: #7CC4E8; background: rgba(201,162,39,.08); }

/* 3. 板块标题：深藏蓝 + 金线（全站统一的 B 感锚点） */
.section-title { color: #0a2540; letter-spacing: -0.02em; }
.section-title::after {
  content: ""; display: block; width: 56px; height: 3px; background: #1DA1D5;
  margin: 16px auto 0; border-radius: 2px;
}
.section-subtitle { color: #5a6a7a; }
.page-hero { background: #f5f8fb; }
.page-hero h1 { color: #0a2540; letter-spacing: -0.02em; }

/* 4. 卡片：圆角收敛 + 深藏蓝悬停（B 骨架） */
.hl-card, .biz-card, .flow-card, .expert-card, .cert-card,
.tier-card, .contact-item, .process-step, .teacher-card {
  border-radius: 8px;
  border: 1px solid #e3e9f0;
}
.hl-card:hover, .biz-card:hover, .flow-card:hover, .expert-card:hover,
.cert-card:hover, .tier-card:hover, .contact-item:hover, .teacher-card:hover {
  border-color: #0a2540;
  box-shadow: 0 14px 34px rgba(10,37,64,.08);
}
.hl-icon, .contact-item-icon {
  background: #eef2f8;
  color: #0a2540;
}

/* 5. 序号 / 标签：金色（杂志感数字与胶囊） */
.biz-num, .flow-num, .num { color: #1DA1D5; }
.cert-chip, .expert-tags span, .level-tag, .cert-badge, .founder-tags span {
  background: rgba(201,162,39,.13);
  color: #0B3D5C;
}
.teacher-rec, .expert-featured .teacher-rec {
  border-left: 3px solid #1DA1D5;
  background: #f7f5ee;
}

/* 6. 深色区（CTA / 页脚）：统一深藏蓝 */
.cta-section, .footer { background: #0a2540; }
.cta-section::before { background: radial-gradient(circle, rgba(201,162,39,.18), transparent 70%); }
.cta-btn { background: #1DA1D5; color: #0a2540; }
.cta-btn:hover { background: #fff; color: #0a2540; box-shadow: 0 14px 38px rgba(0,0,0,.28); }
.footer-col a:hover, .footer-brand a:hover { color: #7CC4E8; }
.footer-bottom { border-top: 1px solid rgba(201,162,39,.25); }

/* 7. 表单：金色焦点环 */
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: #1DA1D5;
  box-shadow: 0 0 0 3px rgba(201,162,39,.15);
  outline: none;
}
/* ==== SITE-BC-THEME END ==== */


/* ===== 公益慈善页（丹雀科技）补充样式 ===== */
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.why-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 40px 32px; text-align: center; transition: var(--transition); }
.why-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.why-icon { width: 64px; height: 64px; margin: 0 auto 20px; background: var(--primary-light); border-radius: 16px; display: flex; align-items: center; justify-content: center; }
.why-icon svg { width: 32px; height: 32px; color: var(--primary); }
.why-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.why-card p { font-size: 0.95rem; color: var(--text-light); line-height: 1.7; }

.promise-list { display: flex; flex-direction: column; gap: 18px; max-width: 860px; margin: 0 auto; }
.promise-item { display: flex; gap: 24px; align-items: flex-start; background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 28px 34px; transition: var(--transition); }
.promise-item:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--primary); }
.promise-num { font-size: 2.4rem; font-weight: 800; color: var(--primary); opacity: 0.85; line-height: 1; flex-shrink: 0; }
.promise-item h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.promise-item p { font-size: 0.95rem; color: var(--text-light); line-height: 1.7; }

.mod-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.charity-cta-btns { display: flex; justify-content: center; }

@media (max-width: 900px) {
  .why-grid, .mod-grid { grid-template-columns: 1fr; }
  .promise-item { flex-direction: column; gap: 10px; padding: 24px; }
  .promise-num { font-size: 1.8rem; }
}