:root {
    --bg-color: #000;
    --text-color: #0f0;
    --border-color: #003300; /* Darker green for grid lines */
    --active-border: #0f0;
    --font-family: 'Courier New', Courier, monospace;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    height: 100vh;
    overflow: hidden;
}

.page-container {
    position: relative;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
    height: 100vh;
    width: 100vw;
    border: 1px solid var(--border-color);
}

.grid-item {
    border: 1px solid var(--border-color);
    padding: 10px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    transition: box-shadow 0.3s, border-color 0.3s;
}

.grid-item:hover {
    box-shadow: 0 0 10px var(--text-color) inset;
    border-color: var(--active-border);
    z-index: 1;
}

.grid-content {
    height: 100%;
    display: flex;
    flex-direction: column;
}

input[type="text"] {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--text-color);
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1.2rem;
    outline: none;
    width: 100%;
}

button {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--text-color);
    font-family: var(--font-family);
    cursor: pointer;
    padding: 2px 10px;
    margin-left: 5px;
    font-weight: bold;
    min-width: 30px;
    text-align: center;
}

button:hover {
    background: transparent;
    color: var(--text-color);
    box-shadow: 0 0 5px var(--text-color);
}

button[value="add"] {
    background: transparent;
    color: #0f0;
    border-color: #0f0;
}

button[value="remove"] {
    background: transparent;
    color: #f00;
    border-color: #f00;
}

button[value="remove"]:hover {
    color: #f00;
    box-shadow: 0 0 5px #f00;
}

.output-area {
    margin-top: 20px;
    flex-grow: 1;
    overflow-y: auto;
    /* border-top: 1px dashed var(--text-color); */
    padding-top: 10px;
}

/* Custom scrollbar for webkit */
::-webkit-scrollbar {
    width: 5px;
}
::-webkit-scrollbar-track {
    background: #000;
}
::-webkit-scrollbar-thumb {
    background: #0f0;
}

.substitution-content {
    word-break: break-all;
    font-size: 1.1rem;
    line-height: 1.5;
    text-shadow: 0 0 2px var(--text-color);
}

h2, h3 {
    margin-top: 0;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
    font-size: 1rem;
}

/* Placeholder style */
.placeholder {
    opacity: 0.3;
    font-size: 0.8rem;
}

/* Grid Controls */
.grid-controls {
    position: absolute;
    top: 5px;
    right: 5px;
    display: flex;
    gap: 5px;
    z-index: 10000; /* Ensure it is above fullscreen content */
    opacity: 0; /* Hidden by default */
    transition: opacity 0.3s;
}

.grid-item:hover .grid-controls {
    opacity: 1;
}

/* Control Buttons Visibility Logic */
.control-btn-back {
    display: none;
}

.grid-item.fullscreen .control-btn-full {
    display: none;
}

.grid-item.fullscreen .control-btn-back {
    display: block;
}

.control-btn {
    background: transparent;
    color: #0f0;
    border: 1px solid #0f0;
    font-size: 0.7rem;
    cursor: pointer;
    padding: 2px 5px;
    font-family: var(--font-family);
    min-width: auto;
    margin-left: 0;
}

.control-btn:hover {
    background: transparent;
    color: #0f0;
    box-shadow: 0 0 5px #0f0;
}

/* Fullscreen mode */
.grid-item.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    background-color: var(--bg-color);
    border: none;
    margin: 0;
    padding: 20px;
    /* Prevent flickering on mobile */
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

.grid-item.fullscreen .grid-controls {
    opacity: 1; /* Always show controls in fullscreen */
}

.grid-item.fullscreen .grid-content {
    height: 100%;
    width: 100%;
}

/* Uniform Input and Button Styles */
.upload-input {
    display: block;
    margin: 10px 0;
    background: transparent;
    color: #0f0;
    border: 1px solid #0f0;
    font-family: var(--font-family);
    padding: 5px;
    width: 100%;
    font-size: 0.8rem;
}

.action-btn {
    width: 100%;
    margin-left: 0;
    margin-top: 5px;
    padding: 5px;
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--text-color);
    cursor: pointer;
    font-weight: bold;
    text-transform: uppercase;
}

.action-btn:hover {
    background: transparent;
    color: var(--text-color);
    box-shadow: 0 0 5px var(--text-color);
}

/* Custom File Input Button */
::file-selector-button {
    background: transparent;
    color: #0f0;
    border: 1px solid #0f0;
    font-family: var(--font-family);
    cursor: pointer;
    margin-right: 10px;
    padding: 2px 5px;
}

::file-selector-button:hover {
    background: transparent;
    color: #0f0;
}

::-webkit-file-upload-button {
    background: transparent;
    color: #0f0;
    border: 1px solid #0f0;
    font-family: var(--font-family);
    cursor: pointer;
    margin-right: 10px;
    padding: 2px 5px;
}

::-webkit-file-upload-button:hover {
    background: transparent;
    color: #0f0;
}

/* Custom Radio and Checkbox */
input[type="radio"], input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    background-color: transparent;
    border: 1px solid #0f0;
    width: 14px;
    height: 14px;
    display: inline-block;
    vertical-align: middle;
    cursor: pointer;
    margin: 0 5px 0 0;
}

input[type="radio"] {
    border-radius: 50%;
}

input[type="checkbox"]:checked {
    background-color: #0f0;
    box-shadow: 0 0 5px #0f0;
    position: relative;
}

/* Add checkmark for checkbox */
input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4px;
    top: 1px;
    width: 3px;
    height: 8px;
    border: solid black;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

input[type="radio"]:checked {
    background-color: #0f0;
    box-shadow: 0 0 5px #0f0;
}

.inline-refresh-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    width: 16px;
    height: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-left: 6px;
    vertical-align: middle;
    min-width: unset;
}

.inline-refresh-btn:hover {
    background: transparent;
    box-shadow: none;
}

.inline-refresh-btn svg {
    width: 100%;
    height: 100%;
    stroke: #0f0;
    fill: none;
    transition: transform 0.3s ease;
}

.inline-refresh-btn:hover svg {
    filter: drop-shadow(0 0 2px #0f0);
    transform: rotate(180deg);
}

.page-nav-bar {
    position: fixed;
    left: 0;
    bottom: 0;
    width: 100vw;
    height: 32px;
    display: flex;
    background: rgba(0, 0, 0, 0.9);
    border-top: 1px solid var(--border-color);
    z-index: 10001;
}

.page-nav-zone {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--text-color);
    cursor: pointer;
    user-select: none;
}

.page-nav-zone:hover {
    background: #050505;
    box-shadow: inset 0 0 8px #003300;
}

.page-nav-prev {
    border-right: 1px solid var(--border-color);
}

/* Page Visibility Logic */
.page {
    display: none;
    width: 100vw;
    height: 100vh;
}

.page.active {
    display: grid;
}