* {margin: 0; padding: 0; box-sizing: border-box;}
html {scroll-behavior: smooth; overflow-x: hidden;}
body {font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'Microsoft YaHei', sans-serif; line-height: 1.65; color: #1a1a1a; background: #ffffff; overflow-x: hidden;}
.page-wrapper {width: 100%; overflow-x: hidden;}
.section-wrapper {max-width: 1200px; margin: 0 auto; padding: 0 30px;}

/* 导航 */
.top-nav {position: fixed; top: 0; left: 0; right: 0; z-index: 999; background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(10px); box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08); transition: all 0.3s;}
.nav-wrap {max-width: 1200px; margin: 0 auto; padding: 20px 30px; display: flex; justify-content: space-between; align-items: center;}
.logo {font-size: 1.8rem; font-weight: 900; color: #000; text-decoration: none; letter-spacing: -1px;}
.logo span {color: #0066ff; margin-left: 4px;}
.menu {display: flex; list-style: none; gap: 48px;}
.menu a {color: #666; text-decoration: none; font-weight: 500; font-size: 1rem; transition: color 0.3s;}
.menu a:hover {color: #0066ff;}
.menu-btn {display: none; font-size: 1.8rem; background: none; border: none; cursor: pointer;}

/* Hero 极简风格 */
.hero-minimal {padding: 160px 30px 100px; background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);}
.hero-container {max-width: 900px; margin: 0 auto; text-align: center;}
.hero-tag {display: inline-block; padding: 8px 20px; background: #e6f2ff; color: #0066ff; border-radius: 20px; font-size: 0.9rem; font-weight: 600; margin-bottom: 32px;}
.hero-h1 {font-size: clamp(2.5rem, 5vw, 4.5rem); font-weight: 900; line-height: 1.2; margin-bottom: 24px; color: #000;}
.color-accent {color: #0066ff;}
.hero-p {font-size: 1.2rem; color: #666; margin-bottom: 48px;}
.hero-cta {display: flex; gap: 16px; justify-content: center; margin-bottom: 80px;}
.cta-btn {padding: 16px 40px; border-radius: 12px; text-decoration: none; font-weight: 600; font-size: 1.05rem; transition: all 0.3s;}
.primary-btn {background: #0066ff; color: white; box-shadow: 0 8px 24px rgba(0, 102, 255, 0.25);}
.primary-btn:hover {background: #0052cc; transform: translateY(-2px); box-shadow: 0 12px 32px rgba(0, 102, 255, 0.35);}
.outline-btn {background: transparent; color: #0066ff; border: 2px solid #0066ff;}
.outline-btn:hover {background: #0066ff; color: white;}
.trust-logos {display: flex; gap: 60px; justify-content: center; align-items: center;}
.trust-item {text-align: center;}
.trust-item strong {display: block; font-size: 2.2rem; font-weight: 800; color: #000; margin-bottom: 4px;}
.trust-item span {font-size: 0.95rem; color: #666;}
.divider-v {width: 1px; height: 50px; background: #ddd;}

/* 特色功能网格 */
.features-grid {padding: 120px 30px; background: #ffffff;}
.section-head {text-align: center; margin-bottom: 80px;}
.section-head h2 {font-size: clamp(2rem, 4vw, 3.2rem); font-weight: 800; color: #000; margin-bottom: 16px;}
.section-head p {font-size: 1.15rem; color: #666;}
.grid-4 {display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 30px;}
.feature-box {background: #f8f9fa; border: 1px solid #e9ecef; border-radius: 16px; padding: 40px; transition: all 0.3s;}
.feature-box:hover {transform: translateY(-8px); box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08); border-color: #0066ff;}
.f-icon {font-size: 3.5rem; margin-bottom: 24px;}
.feature-box h3 {font-size: 1.5rem; font-weight: 700; color: #000; margin-bottom: 12px;}
.feature-box p {color: #666; line-height: 1.8;}

/* 应用展示 - 横向卡片 */
.apps-showcase {padding: 120px 30px; background: #f8f9fa;}
.app-cards {display: flex; flex-direction: column; gap: 32px;}
.app-card {display: grid; grid-template-columns: 200px 1fr; gap: 40px; background: white; border: 1px solid #e9ecef; border-radius: 20px; padding: 40px; transition: all 0.3s; align-items: center;}
.app-card:hover {box-shadow: 0 16px 48px rgba(0, 0, 0, 0.1); transform: translateY(-4px);}
.app-left {position: relative; display: flex; align-items: center; justify-content: center;}
.app-badge {position: absolute; top: -10px; left: -10px; padding: 6px 14px; background: #0066ff; color: white; border-radius: 12px; font-size: 0.85rem; font-weight: 600;}
.app-icon-large {font-size: 6rem;}
.app-right h3 {font-size: 1.8rem; font-weight: 800; color: #000; margin-bottom: 16px;}
.app-right p {color: #666; line-height: 1.8; margin-bottom: 24px;}
.app-btns {display: flex; gap: 12px; flex-wrap: wrap;}
.app-link {display: inline-block; padding: 12px 28px; background: #0066ff; color: white; text-decoration: none; border-radius: 10px; font-weight: 600; transition: all 0.3s;}
.app-link:hover {background: #0052cc; transform: translateY(-2px);}

/* 横向步骤 */
.steps-horizontal {padding: 120px 30px; background: white;}
.steps-row {display: flex; align-items: center; justify-content: center; gap: 40px; margin-top: 60px;}
.step-item {flex: 1; max-width: 300px; text-align: center;}
.step-num {width: 80px; height: 80px; margin: 0 auto 24px; background: linear-gradient(135deg, #0066ff 0%, #0052cc 100%); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 2rem; font-weight: 800; color: white; box-shadow: 0 8px 24px rgba(0, 102, 255, 0.25);}
.step-info h3 {font-size: 1.5rem; font-weight: 700; color: #000; margin-bottom: 12px;}
.step-info p {color: #666; line-height: 1.8;}
.step-arrow {font-size: 2.5rem; color: #0066ff; flex-shrink: 0;}

/* 问答两列 */
.qa-columns {padding: 120px 30px; background: #f8f9fa;}
.qa-grid {display: grid; grid-template-columns: repeat(auto-fit, minmax(450px, 1fr)); gap: 24px;}
.qa-item {background: white; border: 1px solid #e9ecef; border-radius: 12px; overflow: hidden; transition: all 0.3s;}
.qa-item[open] {border-color: #0066ff; box-shadow: 0 8px 24px rgba(0, 102, 255, 0.1);}
.qa-q {padding: 24px; display: flex; justify-content: space-between; align-items: center; cursor: pointer; list-style: none; font-size: 1.1rem; font-weight: 600; color: #000; user-select: none;}
.qa-q::-webkit-details-marker {display: none;}
.qa-q:hover {background: #f8f9fa;}
.qa-icon {font-size: 1.5rem; color: #0066ff; transition: transform 0.3s;}
.qa-item[open] .qa-icon {transform: rotate(45deg);}
.qa-a {padding: 0 24px 24px; color: #666; line-height: 1.8; animation: slideIn 0.3s;}
@keyframes slideIn {from {opacity: 0; transform: translateY(-10px);} to {opacity: 1; transform: translateY(0);}}

/* 页脚 */
.site-footer {padding: 80px 30px 30px; background: #1a1a1a; color: #aaa;}
.footer-grid {display: grid; grid-template-columns: 2fr repeat(3, 1fr); gap: 60px; margin-bottom: 60px;}
.f-logo {font-size: 2rem; font-weight: 900; color: white; margin-bottom: 16px;}
.f-logo span {color: #0066ff; margin-left: 4px;}
.f-desc {margin-bottom: 32px; line-height: 1.7;}
.social-icons {display: flex; gap: 12px;}
.social-icons a {width: 44px; height: 44px; border-radius: 50%; background: rgba(255, 255, 255, 0.05); display: flex; align-items: center; justify-content: center; color: #aaa; transition: all 0.3s;}
.social-icons a:hover {background: #0066ff; color: white; transform: translateY(-3px);}
.footer-col h4 {font-size: 1.1rem; font-weight: 700; color: white; margin-bottom: 20px;}
.footer-col ul {list-style: none;}
.footer-col li {margin-bottom: 12px;}
.footer-col a {color: #aaa; text-decoration: none; transition: color 0.3s;}
.footer-col a:hover {color: #0066ff;}
.footer-bar {display: flex; justify-content: space-between; align-items: center; padding-top: 40px; border-top: 1px solid rgba(255, 255, 255, 0.1);}
.to-top {width: 50px; height: 50px; border-radius: 50%; background: #0066ff; border: none; color: white; font-size: 1.5rem; cursor: pointer; transition: all 0.3s;}
.to-top:hover {background: #0052cc; transform: translateY(-4px); box-shadow: 0 8px 24px rgba(0, 102, 255, 0.4);}

/* 响应式 */
@media (max-width: 1024px) {
    .steps-row {flex-direction: column; gap: 32px;}
    .step-arrow {transform: rotate(90deg);}
    .app-card {grid-template-columns: 1fr;}
    .app-left {margin-bottom: 20px;}
}

@media (max-width: 768px) {
    .menu {display: none;}
    .menu-btn {display: block;}
    .hero-cta {flex-direction: column;}
    .trust-logos {flex-direction: column; gap: 32px;}
    .divider-v {display: none;}
    .grid-4, .qa-grid {grid-template-columns: 1fr;}
    .footer-grid {grid-template-columns: 1fr;}
    .footer-bar {flex-direction: column; gap: 20px; text-align: center;}
}