/* 浅色科技感，突出钉钉下载 CSS */
:root {
    --primary-color: #1677FF;
    --primary-hover: #0958D9;
    --primary-light: #E6F0FF;
    --text-main: #1D2129;
    --text-sub: #4E5969;
    --bg-body: #F4F7FC; /* 浅色科技背景 */
    --bg-card: #FFFFFF;
    --border-color: #E5E6EB;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 4px 12px rgba(22, 119, 255, 0.05);
    --shadow-lg: 0 16px 32px rgba(22, 119, 255, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
    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: var(--bg-body);
    /* 浅色科技网格背景 */
    background-image: 
        linear-gradient(rgba(22, 119, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(22, 119, 255, 0.03) 1px, transparent 1px);
    background-size: 30px 30px;
    -webkit-font-smoothing: antialiased;
}

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

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

/* 按钮样式 - 突出下载 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
    text-align: center;
}

.btn-lg {
    padding: 14px 36px;
    font-size: 18px;
    border-radius: 12px;
}

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

.btn-primary {
    background: linear-gradient(135deg, #1677FF 0%, #00B4FF 100%);
    color: #ffffff;
    box-shadow: 0 8px 20px rgba(22, 119, 255, 0.3);
    position: relative;
    overflow: hidden;
}

/* 突出下载按钮的扫光动画 */
.btn-primary::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.3) 50%, rgba(255,255,255,0) 100%);
    transform: rotate(30deg);
    animation: sweep 3s infinite linear;
}

@keyframes sweep {
    0% { transform: translateX(-100%) rotate(30deg); }
    100% { transform: translateX(100%) rotate(30deg); }
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(22, 119, 255, 0.4);
}

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

.btn-outline:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

/* 导航栏 */
.modern-nav {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(22, 119, 255, 0.1);
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

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

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, #1677FF 0%, #00B4FF 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: bold;
    font-size: 18px;
    box-shadow: 0 4px 10px rgba(22, 119, 255, 0.2);
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-main);
}

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

.nav-menu a {
    font-size: 15px;
    color: var(--text-sub);
    font-weight: 500;
}

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

/* Hero Section */
.modern-hero {
    padding: 100px 0 80px;
    position: relative;
}

.page-hero {
    padding: 80px 0 60px;
}

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

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-content h1 {
    font-size: 48px;
    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-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.hero-meta {
    font-size: 13px;
    color: var(--text-sub);
    display: flex;
    gap: 16px;
}

.hero-img-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    padding: 12px;
    background: var(--bg-card);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(22, 119, 255, 0.1);
}

.hero-img-wrapper::before {
    content: '';
    position: absolute;
    top: -10px;
    right: -10px;
    bottom: -10px;
    left: -10px;
    background: linear-gradient(135deg, rgba(22,119,255,0.2) 0%, rgba(0,180,255,0) 100%);
    border-radius: 24px;
    z-index: -1;
}

.hero-img {
    width: 100%;
    border-radius: 12px;
    display: block;
}

/* Data Section */
.modern-data {
    padding: 60px 0;
}

.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(22, 119, 255, 0.05);
}

.data-num {
    font-size: 42px;
    font-weight: 800;
    background: linear-gradient(135deg, #1677FF 0%, #00B4FF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
}

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

/* Features */
.modern-features {
    padding: 100px 0;
}

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

.section-title h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-main);
}

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

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

.feature-card {
    background-color: var(--bg-card);
    padding: 40px 32px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(22, 119, 255, 0.05);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
    border-color: rgba(22, 119, 255, 0.2);
}

.f-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 24px;
}

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

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

/* Solutions */
.modern-solutions {
    padding: 80px 0 100px;
}

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

.solution-card {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(22, 119, 255, 0.05);
}

.solution-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.card-img-wrap {
    height: 220px;
    overflow: hidden;
}

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

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

.s-content {
    padding: 32px;
}

.s-content h3 {
    font-size: 22px;
    margin-bottom: 12px;
    font-weight: 700;
}

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

/* CTA */
.modern-cta {
    padding: 80px 0;
}

.cta-box {
    background: linear-gradient(135deg, #1677FF 0%, #00B4FF 100%);
    color: #ffffff;
    padding: 80px 40px;
    border-radius: 24px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(22, 119, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml;utf8,<svg width="40" height="40" viewBox="0 0 40 40" xmlns="http://www.w3.org/2000/svg"><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.2)"/></svg>');
}

.cta-box h2 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.cta-box p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    position: relative;
    z-index: 1;
}

/* Download Page Specific */
.download-section {
    padding: 80px 0 120px;
}

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

.dl-card {
    background-color: var(--bg-card);
    border: 1px solid rgba(22, 119, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 48px 32px;
    text-align: center;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.dl-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.dl-card.highlight {
    border: 2px solid var(--primary-color);
    position: relative;
    background: linear-gradient(180deg, #FFFFFF 0%, #F4F9FF 100%);
}

.dl-card.highlight::before {
    content: '官方推荐下载';
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: #fff;
    font-size: 13px;
    padding: 6px 20px;
    border-radius: 20px;
    font-weight: 600;
    box-shadow: 0 4px 10px rgba(22,119,255,0.3);
}

.d-icon {
    font-size: 64px;
    margin-bottom: 24px;
}

.dl-card h3 {
    font-size: 24px;
    margin-bottom: 16px;
    font-weight: 700;
}

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

/* FAQ Section */
.faq-section {
    padding: 80px 0 120px;
}

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

.faq-item {
    background-color: var(--bg-card);
    border: 1px solid rgba(22, 119, 255, 0.1);
    padding: 32px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.faq-item:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(22, 119, 255, 0.3);
}

.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 */
.modern-footer {
    background-color: #FFFFFF;
    border-top: 1px solid var(--border-color);
    padding: 80px 0 24px;
}

.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-sub);
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 16px;
    margin-bottom: 24px;
    font-weight: 600;
    color: var(--text-main);
}

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

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

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

@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; }
}