/* --- 现代UI设计系统变量 --- */
:root {
    --bg-main: #FFFFFF;
    --bg-sub: #F8FAFC;
    --text-primary: #0F172A;   /* 极深邃蓝，代替纯黑 */
    --text-secondary: #475569; /* 优雅灰 */
    --text-muted: #64748B;     /* 深灰，提高对比度至4.5:1+ (原#94A3B8对比度不足) */
    --brand-color: #FF5500;    /* 高阶小橙品牌色 */
    --brand-dim: #FFF0E6;      /* 品牌浅色调 */
    --border-color: #E2E8F0;   /* 细腻边框色 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- 基础重置 --- */
*,
*:before,
*:after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-main);
}

body {
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.7;
}

/* --- 现代网格与留白布局 --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

section {
    padding: 140px 0;
    border-bottom: 1px solid var(--border-color);
}

/* --- 动效基底 --- */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-smooth);
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- 单色SVG图标通用样式 --- */
.tech-icon {
    width: 24px;
    height: 24px;
    stroke: var(--text-primary);
    fill: none;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: var(--transition-smooth);
}

/* --- 导航栏：极致轻量悬浮 --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    transition: var(--transition-smooth);
}

.nav-wrapper {
    height: 90px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
    transition: var(--transition-smooth);
}

.brand-text {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.brand-name {
    color: var(--text-primary);
}

.brand-divider {
    width: 4px;
    height: 4px;
    background-color: var(--brand-color);
    border-radius: 50%;
}

.brand-sub {
    font-weight: 400;
    color: var(--text-secondary);
}

.nav-links {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition-smooth);
}

.nav-links a:hover {
    color: var(--brand-color);
}

.nav-cta {
    background: var(--text-primary);
    color: #FFF;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-smooth);
}

.nav-cta:hover {
    background: var(--brand-color);
    transform: translateY(-1px);
}

/* --- Hero 视觉中心：纯文字排版美学 --- */
.hero-section {
    padding-top: 240px;
    padding-bottom: 160px;
    background: radial-gradient(var(--brand-dim) 0%, transparent 70%);
    background-size: 600px 600px;
    background-position: calc(100% - 100px) 100px;
    background-repeat: no-repeat;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--brand-color);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -2px;
    color: var(--text-primary);
    max-width: 900px;
    margin-bottom: 32px;
}

.hero-title span {
    color: var(--brand-color);
}

.hero-desc {
    font-size: 20px;
    color: var(--text-secondary);
    max-width: 720px;
    font-weight: 400;
    margin-bottom: 48px;
}

/* --- 大厂感大数字面板 --- */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 修改为2列，适应当前两个统计项 */
    gap: 60px; /* 增大间距，使两个项目更平衡 */
    border-top: 1px solid var(--border-color);
    padding-top: 48px;
    max-width: 600px; /* 减小最大宽度，使两个项目更紧凑 */
}

.stat-box .number {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-box .label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* --- 核心战略双轨布局 --- */
.section-header {
    max-width: 700px;
    margin-bottom: 80px;
}

.section-header .tag {
    font-size: 13px;
    color: var(--brand-color);
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 12px;
    display: block;
}

.section-header h2 {
    font-size: 38px;
    font-weight: 700;
    letter-spacing: -1px;
}

.strategy-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.strategy-card {
    padding: 10px 0;
}

.strategy-card .icon-wrap {
    width: 48px;
    height: 48px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 32px;
    transition: var(--transition-smooth);
}

.strategy-card:hover .icon-wrap {
    border-color: var(--brand-color);
    background: var(--brand-dim);
}

.strategy-card:hover .tech-icon {
    stroke: var(--brand-color);
}

.strategy-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.strategy-card .intro {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.point-list {
    list-style: none;
}

.point-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 0;
    border-top: 1px dashed var(--border-color);
}

.point-item .dot-indicator {
    width: 6px;
    height: 6px;
    background: var(--text-muted);
    border-radius: 50%;
    margin-top: 10px;
    transition: var(--transition-smooth);
}

.strategy-card:hover .point-item .dot-indicator {
    background: var(--brand-color);
}

.point-text h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.point-text p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* --- 新增内容：三端全落地生态架构（无图设计） --- */
.ecosystem-section {
    background-color: var(--bg-sub);
}

.eco-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.eco-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 12px;
    transition: var(--transition-smooth);
}

.eco-box:hover {
    transform: translateY(-5px);
    border-color: var(--text-primary);
    box-shadow: 0 20px 40px rgba(15,23,42,0.04);
}

.eco-box .num {
    font-size: 14px;
    font-weight: 700;
    color: var(--brand-color);
    margin-bottom: 24px;
    display: block;
}

.eco-box h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.eco-box p {
    font-size: 15px;
    color: var(--text-secondary);
}

/* --- 政府信任与全国网络 --- */
.trust-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.trust-info h2 {
    font-size: 38px;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.trust-info p {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.badge-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.trust-badge {
    border: 1px solid var(--border-color);
    padding: 18px 24px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition-smooth);
}

.trust-badge:hover {
    background: var(--text-primary);
    color: #FFF;
    border-color: var(--text-primary);
}

/* --- 极简主义联系表单 --- */
.form-wrapper {
    max-width: 640px;
    margin: 0 auto;
}

.minimal-form {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.input-group {
    position: relative;
}

.minimal-form input,
.minimal-form textarea {
    width: 100%;
    border: none;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
    font-size: 16px;
    color: var(--text-primary);
    background: transparent;
    outline: none;
    transition: var(--transition-smooth);
}

.minimal-form input:focus,
.minimal-form textarea:focus {
    border-bottom-color: var(--brand-color);
}

.minimal-form label {
    position: absolute;
    left: 0;
    top: 12px;
    color: var(--text-muted);
    font-size: 16px;
    pointer-events: none;
    transition: var(--transition-smooth);
}

.minimal-form input:focus ~ label,
.minimal-form input:valid ~ label,
.minimal-form textarea:focus ~ label,
.minimal-form textarea:valid ~ label {
    top: -12px;
    font-size: 12px;
    color: var(--brand-color);
    font-weight: 600;
}

.submit-btn {
    background: var(--text-primary);
    color: #FFF;
    border: none;
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition-smooth);
    align-self: flex-start;
}

.submit-btn:hover {
    background: var(--brand-color);
    transform: translateY(-2px);
}

/* --- 高级页脚 --- */
footer {
    background: #0A0F1D; /* 深邃夜蓝 */
    color: #FFFFFF;
    padding: 100px 0 40px 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 80px;
    border-bottom: 1px solid #1E293B;
    padding-bottom: 60px;
    margin-bottom: 40px;
}

.footer-brand h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-brand p {
    color: #94A3B8;
    font-size: 15px;
    max-width: 320px;
}

.footer-nav h5 {
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #94A3B8;
    margin-bottom: 24px;
}

.footer-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-nav a {
    color: #64748B;
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition-smooth);
}

.footer-nav a:hover {
    color: var(--brand-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: #475569;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom a {
    color: #475669;
    text-decoration: none;
    margin-left: 20px;
    transition: var(--transition-smooth);
}

.footer-bottom a:hover {
    color: #94A3B8;
}

/* --- 响应式断点控制 --- */
@media (max-width: 968px) {
    section { padding: 80px 0; }
    .hero-title { font-size: 44px; }
    .strategy-grid,
    .eco-grid,
    .trust-layout,
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .nav-links,
    .nav-cta { display: none; } /* 移动端精简 */
    .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
    
    /* 移动端Hero统计项变为单列 */
    .hero-stats {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}