/* Global Styles */
:root {
    --bg-color: #343333;
    --primary-text-color: #EAEAEA;
    --secondary-text-color: #B3B3B3;
    --accent-color: #03DAC6; /* A bright teal as accent */
    --card-bg-color: #1E1E1E;
    --border-color: #2a2a2a;
}

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

html {
    scroll-behavior: smooth;
}

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

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

/* Hero Section */
.hero-section {
    height: 100vh;
    background-image: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('bg.webp');
    background-size: cover;
    background-position: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 300;
    max-width: 600px;
    margin-bottom: 2rem;
    color: var(--secondary-text-color);
}

.hero-button {
    background-color: var(--accent-color);
    color: #000;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Content Sections */
.content-section {
    max-width: 1000px;
    margin: 0 auto;
    padding: 6rem 2rem;
    text-align: center;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

.section-text {
    font-size: 1.1rem;
    color: var(--secondary-text-color);
    max-width: 800px;
    margin: 0 auto;
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    text-align: left;
}

.feature-card {
    background-color: var(--card-bg-color);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.25);
}

.feature-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.feature-description {
    font-size: 1rem;
    color: var(--secondary-text-color);
}

/* Architecture Section */
.architecture-details {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    text-align: left;
    margin-top: 3rem;
}

.architecture-details h3 {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.architecture-details ul {
    list-style: none;
}

.architecture-details li {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--secondary-text-color);
}

.architecture-details p {
     color: var(--secondary-text-color);
     font-size: 1.1rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
    background-color: var(--card-bg-color);
    border-top: 1px solid var(--border-color);
}

.footer p {
    font-size: 0.9rem;
    color: var(--secondary-text-color);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .content-section {
        padding: 4rem 1rem;
    }
    .section-title {
        font-size: 2rem;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 768px) {
    .architecture-details {
        grid-template-columns: repeat(3, 1fr);
    }
}