/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: black;
    color: white;
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    user-select: none;
}

#app {
    width: 100%;
    height: 100%;
    position: relative;
}

/* Screen management */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    justify-content: center;
    align-items: center;
    background-color: black;
}

.screen.active {
    display: flex;
}

/* Content containers */
.content {
    text-align: center;
    max-width: 800px;
    padding: 40px;
    line-height: 1.6;
}

.content h1 {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}

.content h2 {
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 30px;
}

.content p {
    font-size: 20px;
    margin-bottom: 20px;
}

/* Buttons */
.btn {
    background-color: #333;
    color: white;
    border: 2px solid #666;
    padding: 15px 30px;
    font-size: 18px;
    font-family: Arial, sans-serif;
    cursor: pointer;
    margin: 10px;
    transition: all 0.2s;
}

.btn:hover {
    background-color: #555;
    border-color: #888;
}

.btn:active {
    background-color: #222;
}

/* Stimulus display */
#stimulus-screen {
    justify-content: center;
    align-items: center;
    background-color: black;
}

#stimulus-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

#background-square {
    width: 50vh;   /* 50% of canvas height - perfect square */
    height: 50vh;  /* 50% of canvas height - perfect square */
    background-color: white;
    position: relative;
    display: none;
}

#target-square {
    width: 5vh;    /* 5% of canvas height - perfect square */
    height: 5vh;   /* 5% of canvas height - perfect square */
    background-color: black;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    /* Position will be set dynamically: 35% (target) or 65% (non-target) */
}

/* Target positions */
#target-square.target {
    top: 35%;
    transform: translate(-50%, -50%);
}

#target-square.nontarget {
    top: 65%;
    transform: translate(-50%, -50%);
}

/* Error feedback */
#error-feedback {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 60px;
    font-weight: bold;
    color: red;
    display: none;
    z-index: 100;
}

/* Subject dialog */
.dialog {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.dialog-content {
    background-color: #222;
    padding: 40px;
    border-radius: 8px;
    border: 2px solid #666;
    min-width: 400px;
}

.dialog-content h3 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.form-group input {
    width: 100%;
    padding: 10px;
    font-size: 16px;
    background-color: #333;
    color: white;
    border: 1px solid #666;
    border-radius: 4px;
}

.form-group input:focus {
    outline: none;
    border-color: #999;
}

/* Button group for form buttons */
.button-group {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

.button-group .btn {
    margin: 0;
    flex: 1;
    max-width: 200px;
}

.btn-secondary {
    background-color: #555;
    border-color: #777;
}

.btn-secondary:hover {
    background-color: #666;
    border-color: #999;
}

/* Transition screen */
#transition-screen {
    text-align: center;
    padding: 50px;
    background-color: #000;
    color: #fff;
}

#transition-screen .content {
    margin-top: 200px;
}

/* Sample stimulus styles */
.sample-stimulus {
    display: flex;
    justify-content: center;
    margin: 40px 0;
}

.sample-background {
    width: 50vh;
    height: 50vh;
    background-color: white;
    position: relative;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

.sample-target {
    width: 5vh;
    height: 5vh;
    background-color: black;
    position: absolute;
    left: 50%;
    top: 35%;
    transform: translate(-50%, -50%);
}

.sample-nontarget {
    width: 5vh;
    height: 5vh;
    background-color: black;
    position: absolute;
    left: 50%;
    top: 65%;
    transform: translate(-50%, -50%);
}

.sample-description {
    font-size: 18px;
    line-height: 1.6;
    margin: 30px 0;
    text-align: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Data download section */
#data-download {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #666;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* Navigation buttons section */
#navigation-buttons {
    margin-top: 30px;
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* Responsive adjustments */
@media (max-height: 600px) {
    .content {
        padding: 20px;
    }
    
    .content h1 {
        font-size: 36px;
    }
    
    .content h2 {
        font-size: 24px;
    }
    
    .content p {
        font-size: 16px;
    }
}

/* Fullscreen styles */
body:-webkit-full-screen {
    width: 100%;
    height: 100%;
}

body:-moz-full-screen {
    width: 100%;
    height: 100%;
}

body:fullscreen {
    width: 100%;
    height: 100%;
}

/* Hide cursor during stimulus presentation */
#stimulus-screen.active {
    cursor: none;
}

/* Ensure no scrollbars in fullscreen */
html, body {
    overflow: hidden;
    width: 100%;
    height: 100%;
}

/* Loading indicator */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #666;
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}