/* 极简商务官网风 CSS */
:root {
    --primary: #0050B3; /* 沉稳商务蓝 */
    --primary-hover: #003A8C;
    --text-main: #1D2129; /* 深色正文 */
    --text-light: #4E5969; /* 浅色辅助文本 */
    --bg-light: #F7F8FA; /* 极简灰白背景 */
    --border-color: #E5E6EB;
    --radius: 4px; /* 极简直角/小圆角 */
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    color: var(--text-main);
    line-height: 1.6;
    background-color: #ffffff;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius);
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
}

.btn-lg {
    padding: 12px 32px;
    font-size: 16px;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background-color: rgba(0, 80, 179, 0.05);
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 28px;
    height: 28px;
    background-color: var(--primary);
    border-radius: 4px;
}

.logo-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-main);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    font-size: 15px;
    color: var(--text-light);
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--primary);
}

/* Hero Section */
.hero-section {
    padding: 100px 0;
    background-color: #ffffff;
}

.page-hero {
    padding: 60px 0;
    background-color: var(--bg-light);
    border-bottom: 1px solid var(--border-color);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 44px;
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-main);
}

.hero-desc {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
}

.hero-img {
    width: 100%;
    border-radius: var(--radius);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
}

/* Data Section */
.data-section {
    padding: 60px 0;
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.data-num {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    font-family: Arial, sans-serif;
}

.data-label {
    font-size: 14px;
    color: var(--text-light);
}

/* Features */
.features-section {
    padding: 100px 0;
    background-color: #ffffff;
}

.section-title {
    text-align: center;
    margin-bottom: 64px;
}

.section-title h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title p {
    font-size: 16px;
    color: var(--text-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-item {
    padding: 32px;
    background-color: var(--bg-light);
    border-radius: var(--radius);
    border: 1px solid transparent;
    transition: var(--transition);
}

.feature-item:hover {
    background-color: #ffffff;
    border-color: var(--border-color);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    transform: translateY(-4px);
}

.f-icon {
    font-size: 32px;
    margin-bottom: 20px;
}

.feature-item h3 {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-item p {
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.7;
}

/* Solutions */
.solutions-section {
    padding: 100px 0;
    background-color: var(--bg-light);
    border-top: 1px solid var(--border-color);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.solution-card {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.solution-card:hover {
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
}

.solution-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
}

.s-content {
    padding: 32px;
}

.s-content h3 {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 600;
}

.s-content p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* CTA */
.cta-section {
    padding: 80px 0;
    background-color: #ffffff;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.cta-inner h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 16px;
}

.cta-inner p {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 40px;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* Download Page */
.download-section {
    padding: 80px 0;
    background-color: #ffffff;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.download-card {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 48px 32px;
    text-align: center;
    transition: var(--transition);
}

.download-card:hover {
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
    border-color: var(--primary);
}

.d-icon {
    font-size: 48px;
    margin-bottom: 24px;
}

.download-card h3 {
    font-size: 20px;
    margin-bottom: 16px;
    font-weight: 600;
}

.download-card p {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 32px;
    min-height: 48px;
}

/* FAQ Section */
.faq-section {
    padding: 80px 0;
    background-color: #ffffff;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: var(--radius);
    margin-bottom: 20px;
}

.faq-item h3 {
    font-size: 16px;
    margin-bottom: 16px;
    color: var(--text-main);
    font-weight: 600;
}

.faq-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* Footer */
.footer {
    background-color: var(--bg-light);
    padding: 80px 0 24px;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 15px;
    margin-bottom: 24px;
    font-weight: 600;
    color: var(--text-main);
}

.footer-links a {
    display: block;
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: #86909C;
}

@media (max-width: 900px) {
    .hero-grid, .data-grid, .features-grid, .solutions-grid, .download-grid, .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .nav-menu { display: none; }
    .hero-btns, .cta-actions { flex-direction: column; }
}