:root {
    --primary: #1a4d8c; /* Azul institucional */
    --accent: #f39c12;  /* Amarillo/Naranja escolar */
    --text: #333;
    --bg: #f4f7f6;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
}

.container {
    max-width: 800px;
    padding: 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

.logo {
    max-width: 180px;
    margin-bottom: 1.5rem;
}

h1 {
    color: var(--primary);
    font-size: 2rem;
}

#countdown ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 2rem 0;
}

#countdown li {
    background: var(--primary);
    color: white;
    padding: 15px;
    border-radius: 8px;
    min-width: 80px;
}

#countdown span {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    margin: 10px;
    text-decoration: none;
    border-radius: 5px;
    background: var(--primary);
    color: white;
    transition: 0.3s;
}

.btn-whatsapp {
    background: #25d366;
}

.btn:hover {
    opacity: 0.8;
    transform: translateY(-2px);
}