/* 数字化办公 SaaS 风，现代商务 CSS */
:root {
    --saas-primary: #2563EB; /* 现代商务蓝 */
    --saas-primary-hover: #1D4ED8;
    --saas-secondary: #0F172A; /* 深邃黑蓝 */
    --saas-text-main: #1E293B;
    --saas-text-sub: #475569;
    --saas-text-light: #94A3B8;
    --saas-bg-main: #F8FAFC;
    --saas-bg-white: #FFFFFF;
    --saas-border: #E2E8F0;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.025);
    --shadow-hover: 0 20px 25px -5px rgba(0,0,0,0.05), 0 10px 10px -5px rgba(0,0,0,0.02);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

ul {
    list-style: none;
}

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

/* 按钮样式 - SaaS 现代风 */
.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);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-primary {
    background-color: var(--saas-primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
    background-color: var(--saas-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}

.btn-outline {
    background-color: var(--saas-bg-white);
    border-color: var(--saas-border);
    color: var(--saas-text-main);
    box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
    border-color: var(--saas-primary);
    color: var(--saas-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

/* 导航栏 - 商务极简 */
.saas-nav {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--saas-border);
    z-index: 1000;
}

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

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--saas-primary) 0%, #60A5FA 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    font-size: 16px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--saas-secondary);
    letter-spacing: -0.5px;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-menu a {
    font-size: 14px;
    color: var(--saas-text-sub);
    font-weight: 500;
}

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

/* Hero 首屏 - 现代 SaaS 布局 */
.saas-hero {
    background-color: var(--saas-bg-main);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.saas-hero::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
    border-radius: 50%;
}

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

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

.hero-tag {
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    background-color: #DBEAFE;
    color: var(--saas-primary);
    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(--saas-secondary);
    letter-spacing: -1px;
}

.hero-desc {
    font-size: 18px;
    color: var(--saas-text-sub);
    margin-bottom: 40px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.hero-meta {
    font-size: 13px;
    color: var(--saas-text-light);
    display: flex;
    gap: 24px;
}

.hero-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hero-meta span::before {
    content: '✓';
    color: var(--saas-primary);
    font-weight: bold;
}

.hero-visual .hero-img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--saas-border);
}

/* 数据背书区 */
.saas-data {
    padding: 60px 0;
    background-color: var(--saas-bg-white);
    border-bottom: 1px solid var(--saas-border);
}

.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(--saas-secondary);
    margin-bottom: 8px;
    letter-spacing: -1px;
}

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

/* 通用区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--saas-secondary);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.section-header p {
    font-size: 18px;
    color: var(--saas-text-sub);
}

/* 核心功能区 */
.saas-features {
    padding: 100px 0;
    background-color: var(--saas-bg-main);
}

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

.feature-card {
    background-color: var(--saas-bg-white);
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--saas-border);
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: transparent;
    transform: translateY(-4px);
}

.f-icon {
    width: 56px;
    height: 56px;
    background-color: #EFF6FF;
    color: var(--saas-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 700;
    color: var(--saas-secondary);
}

.feature-card p {
    color: var(--saas-text-sub);
    font-size: 15px;
    line-height: 1.6;
}

/* 行业解决方案区 */
.saas-solutions {
    padding: 100px 0;
    background-color: var(--saas-bg-white);
}

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

.solution-card {
    background-color: var(--saas-bg-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--saas-border);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.s-img {
    height: 200px;
    overflow: hidden;
}

.s-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.solution-card:hover .s-img img {
    transform: scale(1.05);
}

.s-content {
    padding: 32px;
}

.s-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 700;
    color: var(--saas-secondary);
}

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

/* 底部 CTA */
.saas-cta {
    padding: 80px 0;
    background-color: var(--saas-secondary);
    color: #ffffff;
    text-align: center;
}

.saas-cta h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
}

.saas-cta p {
    font-size: 18px;
    color: var(--saas-text-light);
    margin-bottom: 40px;
}

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

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

.btn-white:hover {
    background-color: var(--saas-bg-main);
}

/* 下载页专用 */
.download-section {
    padding: 80px 0 100px;
    background-color: var(--saas-bg-main);
}

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

.dl-card {
    background-color: var(--saas-bg-white);
    border: 1px solid var(--saas-border);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    text-align: center;
    transition: var(--transition);
}

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

.dl-card.highlight {
    border: 2px solid var(--saas-primary);
    position: relative;
    box-shadow: var(--shadow-md);
}

.dl-card.highlight::before {
    content: '企业推荐';
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--saas-primary);
    color: #fff;
    font-size: 13px;
    padding: 4px 16px;
    border-radius: 20px;
    font-weight: 600;
}

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

.dl-card h3 {
    font-size: 22px;
    margin-bottom: 16px;
    font-weight: 700;
    color: var(--saas-secondary);
}

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

/* 帮助中心专用 */
.faq-section {
    padding: 80px 0 100px;
    background-color: var(--saas-bg-white);
}

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

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

.faq-item:hover {
    border-color: var(--saas-primary);
    box-shadow: var(--shadow-md);
}

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

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

/* 页脚 */
.saas-footer {
    background-color: #0B0F19;
    color: var(--saas-text-light);
    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;
    line-height: 1.8;
}

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

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

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

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

@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-actions, .cta-actions { flex-direction: column; }
}