/* Basic Reset and Body Styling */
body {
    font-family: 'Roboto Mono', monospace; /* A monospace font looks great for a math blog */
    background-color: #f4f7f6; /* Light, subtle background */
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    text-align: center;
}

/* Container for all content */
.container {
    max-width: 800px;
    padding: 40px 20px;
    background-color: #ffffff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
}

/* Header Styling */
header h1 {
    font-size: 3em;
    color: #007bff; /* A nice mathematical blue */
    margin-bottom: 0.1em;
}

header h2 {
    font-size: 1.2em;
    color: #6c757d;
    font-weight: 400;
    margin-top: 0;
}

/* Main Content and Announcement */
.announcement {
    font-size: 1.5em;
    margin: 40px 0;
    color: #555;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 20px;
}

/* Countdown Timer Styling */
.countdown {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.countdown div {
    background-color: #007bff;
    color: white;
    padding: 15px 20px;
    border-radius: 8px;
    min-width: 80px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.countdown span {
    display: block;
    font-size: 2.5em;
    font-weight: bold;
    line-height: 1;
}

/* Subscription Form Styling */
.subscribe h3 {
    color: #007bff;
}

.subscribe input[type="email"] {
    padding: 12px;
    width: 60%;
    max-width: 300px;
    border: 2px solid #ced4da;
    border-radius: 6px 0 0 6px; /* Rounded only on the left */
    outline: none;
    font-size: 1em;
}

.subscribe button {
    padding: 12px 20px;
    background-color: #28a745; /* A bright, action-oriented green */
    color: white;
    border: none;
    border-radius: 0 6px 6px 0; /* Rounded only on the right */
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s;
    margin-left: -5px; /* Pull the button over the input border */
}

.subscribe button:hover {
    background-color: #218838;
}

/* Footer Styling */
footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
    font-size: 0.9em;
    color: #6c757d;
}

.social-links a {
    color: #007bff;
    text-decoration: none;
    margin: 0 10px;
}

.social-links a:hover {
    text-decoration: underline;
}