body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #1a237e 0%, #0d123b 100%); /* Deep Indigo gradient */
    color: #e0e0e0;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    box-sizing: border-box;
    padding: 20px;
}

.container {
    background-color: #2a3163; /* Slightly lighter indigo for the card */
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    max-width: 800px;
    width: 100%;
    text-align: center;
    animation: fadeIn 1s ease-out;
}

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

header {
    margin-bottom: 40px;
}

.app-logo {
    width: 120px;
    height: 120px;
    border-radius: 20px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

h1 {
    font-size: 2.8em;
    color: #ffffff;
    margin-bottom: 10px;
    font-weight: 700;
}

p {
    font-size: 1.1em;
    line-height: 1.6;
    color: #c0c0c0;
}

.instructions {
    margin-top: 40px;
    text-align: left;
}

.instructions h2 {
    font-size: 2.2em;
    color: #8c9eff; /* Lighter indigo */
    margin-bottom: 30px;
    border-bottom: 2px solid #3f51b5;
    padding-bottom: 10px;
}

.platform-section {
    background-color: #363f73; /* Even lighter indigo for sections */
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 25px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.platform-section h3 {
    font-size: 1.8em;
    color: #a7b7ff; /* Even lighter */
    margin-bottom: 15px;
}

.platform-section p {
    font-size: 1em;
    margin-bottom: 10px;
    color: #d0d0d0;
}

.btn {
    display: inline-block;
    padding: 15px 30px;
    margin-top: 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1em;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.download-btn {
    background-color: #4CAF50; /* Green */
    color: white;
}

.download-btn:hover {
    background-color: #45a049;
    transform: translateY(-2px);
}

.testflight-btn {
    background-color: #007AFF; /* Apple Blue */
    color: white;
}

.testflight-btn:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

.feedback-btn {
    background-color: #FFC107; /* Amber */
    color: #333;
}

.feedback-btn:hover {
    background-color: #e0a800;
    transform: translateY(-2px);
}

.note {
    font-size: 0.9em;
    color: #a0a0a0;
    margin-top: 10px;
}

.important {
    background-color: #c62828; /* Dark Red */
    color: white;
    padding: 15px;
    border-radius: 8px;
    margin-top: 40px;
    font-weight: 600;
    text-align: center;
}

.important a {
    color: #ffe082;
    text-decoration: underline;
}

footer {
    margin-top: 50px;
    font-size: 0.9em;
    color: #909090;
}

a {
    color: #8c9eff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}