/* ============ 首页专属样式 ============ */
body { line-height: 1.5; }

.nav-logo { border-radius: 6px; }

.hero { position: relative; z-index: 1; text-align: center; padding: 70px 24px 40px; display: flex; flex-direction: column; align-items: center; }
.badge { display: inline-flex; align-items: center; gap: 8px; background: var(--blue-50); color: var(--blue-700); font-size: 0.85rem; font-weight: 600; padding: 6px 18px; border-radius: var(--radius-full); margin-bottom: 20px; border: 1px solid var(--blue-200); }
.badge .dot { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{box-shadow:0 0 0 0 rgba(34,197,94,0.5);} 50%{box-shadow:0 0 0 10px rgba(34,197,94,0);} }
.hero-slider { width: 100%; max-width: 750px; position: relative; overflow: hidden; }
.hero-slide { display: none; animation: fadeSlide 0.6s ease; }
.hero-slide.active { display: block; }
@keyframes fadeSlide { from{opacity:0;transform:translateY(10px);} to{opacity:1;transform:translateY(0);} }
.hero h1 { font-size: clamp(2.4rem,5vw,3.8rem); font-weight: 800; letter-spacing: -1.5px; line-height: 1.15; margin-bottom: 16px; }
.hero h1 .gradient-text { background: linear-gradient(135deg,#2563eb,#6366f1,#06b6d4); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; color: transparent; }
.hero h1 .gradient-text-purple { background: linear-gradient(135deg,#7c3aed,#8b5cf6,#06b6d4); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; color: transparent; }
.hero p { font-size: 1.1rem; color: var(--text-slate-500); max-width: 620px; margin: 0 auto 32px; line-height: 1.7; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.slider-dots { display: flex; gap: 8px; justify-content: center; margin-top: 20px; }
.slider-dot { width: 10px; height: 10px; border-radius: 50%; background: #cbd5e1; border: none; cursor: pointer; transition: all 0.3s; }
.slider-dot.active { background: var(--blue-600); width: 28px; border-radius: 10px; }

.btn-purple { background: var(--purple-600); color: #fff; box-shadow: 0 8px 24px rgba(124,58,237,0.3); }

.section-sub { margin-bottom: 28px; }

.cdn-nodes-section { padding: 30px 24px 60px; max-width: 1200px; margin: 0 auto; position: relative; z-index: 1; }
.cdn-nodes-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 10px; }
.cdn-node-card { background: #fff; border: 1px solid #e8ecf1; border-radius: var(--radius-lg); padding: 28px 20px; text-align: center; transition: var(--transition); }
.cdn-node-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-xl); }
.node-icon { width: 56px; height: 56px; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; margin-bottom: 16px; font-size: 1.8rem; }
.cdn-node-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 6px; }
.cdn-node-card p { color: var(--text-slate-500); font-size: 0.9rem; }

.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; padding: 40px 24px 70px; max-width: 1200px; margin: 0 auto; }
.feature-card { background: #fff; border: 1px solid #e8ecf1; border-radius: var(--radius-lg); padding: 28px 24px; transition: var(--transition); }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.feature-icon { width: 44px; height: 44px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; margin-bottom: 18px; }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 6px; }
.feature-card p { font-size: 0.92rem; color: var(--text-slate-500); }

.steps-section { padding: 50px 24px 70px; max-width: 1000px; margin: 0 auto; }
.steps-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 24px; margin-top: 32px; }
.step-card { text-align: center; padding: 28px 20px; background: #fff; border-radius: var(--radius-lg); border: 1px solid #e8ecf1; }
.step-number { display: inline-flex; width: 48px; height: 48px; border-radius: 50%; background: linear-gradient(135deg,#2563eb,#6366f1); color: #fff; font-weight: 800; align-items: center; justify-content: center; margin-bottom: 16px; }

/* 文件快传模块 */
.file-transfer-section { padding: 30px 24px 60px; max-width: 1200px; margin: 0 auto; position: relative; z-index: 1; }
.file-transfer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.ft-card { background: #fff; border: 1px solid #e8ecf1; border-radius: var(--radius-lg); padding: 24px 20px; display: flex; flex-direction: column; align-items: flex-start; gap: 12px; transition: var(--transition); text-align: left; }
.ft-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #cbd5e1; }
.ft-card-icon { width: 42px; height: 42px; border-radius: 12px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: 1.1rem; }
.ft-card h4 { font-size: 1rem; font-weight: 700; color: var(--text-slate-900); }
.ft-card p { font-size: 0.85rem; color: var(--text-slate-500); line-height: 1.5; }

/* 企业签名 */
.enterprise-sign-section { padding: 50px 24px 70px; max-width: 1100px; margin: 0 auto; }
.enterprise-sign-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-bottom: 36px; }
.sign-feature-card { background: #fff; border: 1px solid #e8ecf1; border-radius: var(--radius-lg); padding: 28px 24px; transition: var(--transition); }
.sign-feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-xl); }
.sign-feature-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.sign-feature-card p { font-size: 0.88rem; color: var(--text-slate-500); }
.enterprise-sign-highlight { background: linear-gradient(135deg,#f5f3ff 0%,#eff6ff 100%); border: 1px solid #ddd6fe; border-radius: var(--radius-xl); padding: 32px 28px; text-align: center; }

/* 价格 */
.pricing-section { padding: 40px 24px 70px; max-width: 1000px; margin: 0 auto; }
.pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-top: 32px; }
.price-card { background: #fff; border: 1px solid #e8ecf1; border-radius: var(--radius-lg); padding: 28px 22px; text-align: center; transition: var(--transition); }
.price-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.price-card.featured { border: 2px solid var(--blue-500); box-shadow: 0 0 32px rgba(59,130,246,0.12); }
.price-amount { font-size: 2.8rem; font-weight: 800; color: var(--text-slate-900); margin: 12px 0 4px; }
.price-period { color: var(--text-slate-500); font-size: 0.9rem; margin-bottom: 16px; }
.price-features { list-style: none; text-align: left; margin: 20px 0; color: var(--text-slate-700); font-size: 0.88rem; }
.price-features li { padding: 6px 0; display: flex; align-items: center; gap: 8px; }
.price-features li::before { content: '✓'; color: #10b981; font-weight: 700; }

/* FAQ */
.faq-section { padding: 40px 24px 70px; max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid #e2e8f0; padding: 18px 0; }
.faq-question { width: 100%; background: none; border: none; text-align: left; font-size: 1rem; font-weight: 600; color: var(--text-slate-900); cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-question:hover { color: var(--blue-600); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; color: var(--text-slate-500); font-size: 0.9rem; line-height: 1.6; }
.faq-answer.open { max-height: 200px; margin-top: 10px; }
.faq-icon { font-size: 1.2rem; transition: transform 0.3s; }
.faq-icon.open { transform: rotate(45deg); }

@media (max-width: 768px) {
    .hero { padding: 50px 16px 30px; }
}