:root {
    --bg-color: #0d0d0d;
    --text-color: #f2f2f2;
    --accent-color: #00ffcc;
    --card-bg: #1a1a1a;
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

#app-container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

header {
    margin-bottom: 4rem;
    animation: fadeInDown 0.8s ease-out;
}

h1 {
    font-size: 3rem;
    margin: 0;
    letter-spacing: -1px;
}

.dot {
    color: var(--accent-color);
}

.subtitle {
    color: #888;
    font-size: 1.2rem;
    margin-top: 0.5rem;
}

.hero {
    margin-bottom: 4rem;
    animation: fadeInUp 1s ease-out;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #aaa;
    margin-bottom: 2rem;
}

.primary-btn {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 4px;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 255, 204, 0.4);
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    animation: fadeInUp 1.2s ease-out;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid #333;
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.feature-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
}

.feature-card h3 {
    margin-top: 0;
    color: var(--accent-color);
}

footer {
    margin-top: auto;
    padding-top: 2rem;
    text-align: center;
    color: #555;
    font-size: 0.9rem;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}