:root {
    --color-primary: #0A2463;
    --color-primary-light: #1E3A8A;
    --color-accent: #3E92CC;
    --color-accent-light: #7AB3D9;
    --color-background: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-text: #0F172A;
    --color-text-muted: #475569;
    --color-border: #E2E8F0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.6;
}

/* Nav */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, #1E40AF 50%, var(--color-accent) 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 9999px;
    color: white;
    font-size: 0.875rem;
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    color: white;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-cta {
    display: inline-flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.btn-primary {
    padding: 1rem 2rem;
    background: white;
    color: var(--color-primary);
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    padding: 1rem 2rem;
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
}

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

/* Section Common */
.section {
    padding: 6rem 1rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

/* Feature Cards */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--color-surface);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(10, 36, 99, 0.12);
    border-color: var(--color-accent);
}

.feature-icon {
    width: 3.5rem;
    height: 3.5rem;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    color: white;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* Marketing Section */
.marketing-section {
    background: linear-gradient(180deg, var(--color-background) 0%, #E0E7FF 100%);
}

.marketing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.marketing-card {
    background: var(--color-surface);
    border-radius: 1rem;
    padding: 1.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.marketing-card:hover {
    box-shadow: 0 8px 30px rgba(10, 36, 99, 0.1);
}

.marketing-icon {
    width: 3rem;
    height: 3rem;
    background: rgba(62, 146, 204, 0.1);
    border-radius: 0.625rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
    color: var(--color-accent);
}

.marketing-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.5rem;
}

.marketing-desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Tech Stack */
.tech-section {
    background: var(--color-primary);
    color: white;
}

.tech-section .section-title,
.tech-section .section-subtitle {
    color: white;
}

.tech-section .section-subtitle {
    opacity: 0.8;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.tech-item {
    text-align: center;
    padding: 1.5rem 1rem;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.tech-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: scale(1.05);
}

.tech-icon {
    width: 2.5rem;
    height: 2.5rem;
    margin: 0 auto 0.75rem;
    color: var(--color-accent-light);
}

.tech-name {
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.9;
}

.tech-ver {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 0.25rem;
}

/* Footer */
.footer {
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.6);
    padding: 3rem 1rem 2rem;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-icp {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 0.5rem;
    font-size: 0.875rem;
}

.footer-icp a {
    color: var(--color-accent-light);
    text-decoration: none;
}

.footer-icp a:hover {
    text-decoration: underline;
}

.footer-contact {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.footer-contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
}

.footer-contact-item svg {
    width: 1.125rem;
    height: 1.125rem;
    color: var(--color-accent-light);
}

.footer-contact-item a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-contact-item a:hover {
    color: var(--color-accent-light);
}

.footer-copy {
    margin-top: 1.5rem;
    font-size: 0.8125rem;
    opacity: 0.5;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Mobile Nav */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
}