:root {
    --niti-primary: #0066FF;
    --niti-primary-dark: #0052CC;
    --niti-secondary: #00D1FF;
    --niti-accent: #FF3366;
    --niti-text: #1A1A1A;
    --niti-text-light: #4D4D4D;
    --niti-background: #FFFFFF;
    --niti-background-alt: #F8F9FC;
    --niti-border: #E5E9F0;
    --niti-shadow: rgba(0, 0, 0, 0.08);
    --niti-gradient: linear-gradient(135deg, var(--niti-primary), var(--niti-secondary));
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'SF Pro Display', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--niti-text);
    background-color: var(--niti-background);
}

.niti-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 1px 0 var(--niti-border);
}

.niti-nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.75rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.company-logo {
    width: 180px;
    height: 60px;
    background-image: url('../img/company-logo.png');
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center;
}

.niti-nav-links {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.niti-nav-links a {
    text-decoration: none;
    color: var(--niti-text);
    font-weight: 500;
    font-size: 1.1rem;
    transition: color 0.3s ease;
    position: relative;
}

.niti-nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--niti-gradient);
    transition: width 0.3s ease;
}

.niti-nav-links a:hover::after {
    width: 100%;
}

.niti-active {
    color: var(--niti-primary) !important;
}

.niti-active::after {
    width: 100% !important;
}

.niti-hero {
    height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 0 2rem;
    margin-top: 80px;
    overflow: hidden;
}

.niti-hero-content {
    max-width: 1000px;
    z-index: 1;
}

.niti-hero h1 {
    font-size: 4.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: var(--niti-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.niti-hero p {
    font-size: 1.5rem;
    color: var(--niti-text-light);
    margin-bottom: 3rem;
    font-weight: 400;
}

.niti-hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.niti-cta-primary {
    display: inline-block;
    padding: 1.25rem 2.5rem;
    background: var(--niti-gradient);
    color: white;
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.niti-cta-secondary {
    display: inline-block;
    padding: 1.25rem 2.5rem;
    background: transparent;
    color: var(--niti-primary);
    text-decoration: none;
    border: 2px solid var(--niti-primary);
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.niti-cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px var(--niti-shadow);
}

.niti-cta-secondary:hover {
    background: var(--niti-primary);
    color: white;
    transform: translateY(-2px);
}

.niti-hero-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0.15;
}

.niti-stats {
    background: var(--niti-background-alt);
    padding: 4rem 2rem;
}

.niti-stats-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
    text-align: center;
}

.niti-stat-number {
    display: block;
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--niti-primary);
    margin-bottom: 0.5rem;
    background: var(--niti-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.niti-stat-label {
    font-size: 1.2rem;
    color: var(--niti-text-light);
    font-weight: 500;
}

.niti-div-header {
    text-align: center;
    margin-bottom: 4rem;
}

.niti-div-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--niti-text);
}

.niti-div-header p {
    font-size: 1.2rem;
    color: var(--niti-text-light);
}

.niti-features {
    padding: 8rem 2rem;
    background: var(--niti-background);
}

.niti-features-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.niti-feature-card {
    background: var(--niti-background-alt);
    padding: 3rem 2rem;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--niti-border);
}

.niti-feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px var(--niti-shadow);
}

.niti-feature-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 2rem;
}

.niti-feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--niti-text);
}

.niti-feature-card p {
    color: var(--niti-text-light);
    font-size: 1.1rem;
    line-height: 1.6;
}

.niti-showcase {
    padding: 8rem 2rem;
    background: var(--niti-background-alt);
}

.niti-showcase-grid {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4rem;
}

.niti-showcase-item {
    background: var(--niti-background);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px var(--niti-shadow);
}

.niti-showcase-image {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.niti-showcase-content {
    padding: 2.5rem;
}

.niti-showcase-content h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--niti-text);
}

.niti-showcase-content p {
    color: var(--niti-text-light);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.6;
}

.niti-showcase-link {
    color: var(--niti-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.niti-showcase-link::after {
    content: '→';
    transition: transform 0.3s ease;
}

.niti-showcase-link:hover::after {
    transform: translateX(5px);
}

.niti-cta {
    padding: 8rem 2rem;
    background: #0066FF;
    text-align: center;
}

.niti-cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.niti-cta-content h2 {
    font-size: 3rem;
    color: white;
    margin-bottom: 1.5rem;
}

.niti-cta-content p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2.5rem;
}

.niti-cta-button {
    display: inline-block;
    padding: 1.25rem 3rem;
    background: white;
    color: var(--niti-primary);
    text-decoration: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.niti-cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.niti-footer {
    background-color: #172B4D;
    color: #fff;
    padding: 6rem 2rem 2rem;
}

.niti-footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 6rem;
}

.niti-footer-logo {
    width: 240px;
    height: 80px;
    margin-bottom: 2rem;
    background: url('../img/logo-white.svg') no-repeat center;
    background-size: contain;
}

.niti-footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
}

.niti-footer-column h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: #FFFFFF;
}

.niti-footer-column ul {
    list-style: none;
}

.niti-footer-column ul li {
    margin-bottom: 1rem;
}

.niti-footer-column a {
    text-decoration: none;
    color: #fff;
    transition: color 0.3s ease;
}

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

.niti-footer-bottom {
    max-width: 1400px;
    margin: 4rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid var(--niti-border);
    text-align: center;
    color: #fff;
}

.niti-footer .company-logo {
    width: 180px;
    height: 50px;
    background-image: url('../img/logo-white.svg');
    background-size: contain;
    background-repeat: no-repeat;
}

.niti-logo-container {
    width: 120px;
    height: 40px;
}

.niti-logo {
    height: 35px;
    width: auto;
    margin-right: 15px;
    transition: transform 0.3s ease;
}

.niti-logo:hover {
    transform: scale(1.05);
}

.niti-logo-container .company-logo {
    width: 180px;
    height: 50px;
    background-image: url('../img/logo.svg');
    background-size: contain;
    background-repeat: no-repeat;
}

.company-name {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
    margin: 0;
    padding: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.niti-footer-logo .niti-logo {
    height: 40px;
    margin-bottom: 15px;
}

/* 底部Logo */
.footer-logo {
    width: 240px;
    height: 80px;
    margin-bottom: 2rem;
    background: url('../img/logo-white.svg') no-repeat center;
    background-size: contain;
}

@media (max-width: 1200px) {
    .niti-hero h1 {
        font-size: 3.5rem;
    }

    .niti-features-grid,
    .niti-showcase-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .niti-nav {
        flex-direction: column;
        gap: 1rem;
    }

    .niti-nav-links {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }

    .niti-hero h1 {
        font-size: 2.5rem;
    }

    .niti-hero-cta {
        flex-direction: column;
    }

    .niti-stats-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .niti-features-grid,
    .niti-showcase-grid {
        grid-template-columns: 1fr;
    }

    .niti-footer-content {
        grid-template-columns: 1fr;
    }

    .niti-footer-links {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}