/* GLOBAL STYLES */
body {
    margin: 0;
    font-family: 'Nunito', sans-serif; /* Rounded font */
    background-color: #f9f9f9;
    height: 100vh;
    overflow: hidden; /* Prevents scrolling */
}

.hidden {
    display: none !important;
}

/* TOP MENU */
#top-menu {
    height: 60px;
    background-color: white;
    display: flex;
    align-items: center;
    justify-content: center; /* Center buttons horizontally */
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.menu-btn {
    background: none;
    border: none;
    font-family: 'Nunito', sans-serif;
    font-size: 16px;
    color: #333;
    padding: 10px 20px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.menu-btn:hover {
    background-color: #f0f0f0;
    border-radius: 4px;
}

.separator {
    width: 1px;
    height: 20px;
    background-color: #555; /* Dark gray separator */
    margin: 0 5px;
}

/* PAGE CONTAINER */
.page {
    height: 100vh;
    padding-top: 60px; /* Space for fixed menu */
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* PAGE A SPECIFIC */
#page-a {
    justify-content: center; /* Center vertically */
    margin-top: -40px; /* Slight offset to look optical centered */
}

#page-a h1 {
    font-size: 80px;
    margin: 0 0 10px 0;
    color: #000;
}

#page-a p {
    color: #666;
    font-size: 20px;
    margin-bottom: 40px;
}

.btn-main {
    background-color: #007BFF; /* Blue */
    color: white;
    border: none;
    padding: 15px 50px;
    font-size: 20px;
    font-family: 'Nunito', sans-serif;
    border-radius: 30px; /* Fully rounded corners */
    cursor: pointer;
    transition: transform 0.2s ease;
}

.btn-main:hover {
    transform: scale(1.1); /* Zoom effect */
}

/* PAGE B SPECIFIC */
#page-b {
    justify-content: space-evenly; /* Distribute vertical space */
    padding-bottom: 20px;
}

/* 1. Display Area */
#display-area {
    width: 60%;
    height: 50%; /* Takes up half the page height */
    border: 2px solid #ddd;
    border-radius: 12px;
    background-color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #555;
    font-size: 24px;
    position: relative;
}

/* 2. Timeline Area */
#timeline-area {
    width: 60%;
    height: 80px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.timeline-label {
    position: absolute;
    top: 0;
    left: 0;
    color: #888;
    font-size: 14px;
}

#timeline-line {
    width: 100%;
    height: 2px;
    background-color: #87CEEB; /* Light blue */
}

/* 3. Control Panel */
#control-panel {
    display: flex;
    gap: 20px;
    width: 60%;
    justify-content: space-between;
}

.action-btn {
    flex: 1; /* Evenly distributed width */
    padding: 12px 0;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-family: 'Nunito', sans-serif;
    font-weight: 700;
    cursor: pointer;
    color: white;
    transition: opacity 0.2s;
}

.action-btn:hover {
    opacity: 0.9;
}

.action-btn.green { background-color: #28a745; }
.action-btn.yellow { background-color: #ffc107; color: #333; }
.action-btn.blue { background-color: #17a2b8; }
.action-btn.red { background-color: #dc3545; }

/* 4. Frame Control */
#frame-control {
    display: flex;
    align-items: center;
    gap: 15px;
    color: #333;
    font-weight: bold;
}

#frame-slider {
    width: 200px;
    cursor: pointer;
}

#frame-input {
    width: 50px;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
    text-align: center;
    font-family: 'Nunito', sans-serif;
}