/* 企业协同官网风，按钮和导航明确 CSS */
:root {
    --primary-color: #008CEE; /* 钉钉经典蓝 */
    --primary-hover: #0077CC;
    --text-main: #171A1D; /* 深色正文 */
    --text-sub: #5C636B; /* 灰色辅助文本 */
    --bg-light: #F4F6F8; /* 浅灰背景 */
    --border-color: #E3E5E8;
    --radius-sm: 4px;
    --radius-md: 8px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --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;
}

/* 明确的按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
    text-align: center;
}

.btn-lg {
    padding: 14px 36px;
    font-size: 16px;
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(0, 140, 238, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 6px 16px rgba(0, 140, 238, 0.3);
    transform: translateY(-1px);
}

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

.btn-outline:hover {
    background-color: #F0F8FF;
}

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

.btn-white:hover {
    background-color: #F4F6F8;
    transform: translateY(-1px);
}

.btn-outline-white {
    background-color: transparent;
    border-color: #ffffff;
    color: #ffffff;
}

.btn-outline-white:hover {
    background-color: rgba(255,255,255,0.1);
}

/* 明确的导航样式 */
.corp-nav {
    position: sticky;
    top: 0;
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.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: 32px;
    height: 32px;
    background-color: var(--primary-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon::after {
    content: '';
    width: 14px;
    height: 14px;
    background-color: #fff;
    border-radius: 3px;
    transform: rotate(45deg);
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    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-main);
    font-weight: 500;
    padding: 24px 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

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

.nav-menu a:hover::after, .nav-menu a.active::after {
    transform: scaleX(1);
}

/* Hero Section */
.corp-hero {
    padding: 80px 0;
    background-color: var(--bg-light);
    overflow: hidden;
}

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

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

.hero-tag {
    display: inline-block;
    padding: 6px 16px;
    background-color: rgba(0, 140, 238, 0.1);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-content h1 {
    font-size: 46px;
    line-height: 1.2;
    font-weight: 800;
    margin-bottom: 24px;
    color: var(--text-main);
}

.hero-desc {
    font-size: 18px;
    color: var(--text-sub);
    margin-bottom: 40px;
    line-height: 1.8;
}

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

.hero-img {
    width: 100%;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* Data Section */
.corp-data {
    padding: 60px 0;
    background-color: #ffffff;
    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: 40px;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.data-label {
    font-size: 15px;
    color: var(--text-sub);
    font-weight: 500;
}

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

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

.section-title h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

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

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

.feature-item {
    padding: 40px 32px;
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: var(--transition);
}

.feature-item:hover {
    background-color: #ffffff;
    border-color: var(--border-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.f-icon {
    width: 56px;
    height: 56px;
    background-color: #ffffff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-sm);
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 700;
}

.feature-item p {
    color: var(--text-sub);
    font-size: 15px;
    line-height: 1.7;
}

/* Solutions */
.corp-solutions {
    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-md);
    overflow: hidden;
    transition: var(--transition);
}

.solution-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.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: 20px;
    margin-bottom: 12px;
    font-weight: 700;
}

.s-content p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.7;
}

/* CTA */
.corp-cta {
    padding: 80px 0;
    background-color: #ffffff;
}

.cta-inner {
    background-color: var(--primary-color);
    background-image: linear-gradient(135deg, #008CEE 0%, #005BB5 100%);
    color: #ffffff;
    padding: 60px 40px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: 0 12px 32px rgba(0, 140, 238, 0.2);
}

.cta-inner h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-inner p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Download Page */
.download-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

.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-md);
    padding: 48px 32px;
    text-align: center;
    transition: var(--transition);
}

.download-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.d-icon {
    font-size: 56px;
    margin-bottom: 24px;
}

.download-card h3 {
    font-size: 22px;
    margin-bottom: 16px;
    font-weight: 700;
}

.download-card p {
    color: var(--text-sub);
    font-size: 15px;
    margin-bottom: 32px;
    min-height: 48px;
}

/* FAQ Section */
.faq-section {
    padding: 80px 0;
    background-color: var(--bg-light);
}

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

.faq-item {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    padding: 32px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--text-main);
    font-weight: 700;
}

.faq-item p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.7;
}

/* Footer */
.corp-footer {
    background-color: #171A1D; /* 深色企业底部 */
    color: #ffffff;
    padding: 80px 0 24px;
}

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

.footer-brand .logo-text {
    color: #ffffff;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 14px;
    color: #8A9299;
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 24px;
    font-weight: 600;
    color: #ffffff;
}

.footer-links a {
    display: block;
    color: #8A9299;
    font-size: 14px;
    margin-bottom: 16px;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: #8A9299;
}

@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; }
}