body.dark {
    background-color: #0f0f0f;
    color: #f3f4f6;
    font-family: "Inter", system-ui, sans-serif;
    padding: 40px 20px;
}

.container {
    max-width: 520px;
    margin: auto;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
}

.dark-container {
    background-color: #1a1a1a;
    border: 1px solid #27272a;
    box-shadow: 0 0 0 1px #222;
}

.center-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.header {
    margin-bottom: 25px;
}

.logo {
    height: 150px;
}

.title {
    font-size: 24px;
    margin-bottom: 12px;
    color: #ffffff;
    line-height: 1.4;
}

.greeting {
    font-size: 16px;
    margin-bottom: 12px;
}

.content p {
    font-size: 15px;
    line-height: 1.6;
    margin: 10px 0;
    color: #d1d5db;
}

.spaced {
    margin: 20px 0;
}

.highlight {
    color: #93c5fd;
    font-weight: bold;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    margin-top: 25px;
    font-size: 15px;
}

.dark-btn {
    background-color: #2563eb;
    color: white;
    transition: background 0.2s ease-in-out;
}

.dark-btn:hover {
    background-color: #1d4ed8;
}