/* CSS Variables and Reset */
html, body {
    --background-color: #111;
    --backlight-color: #222;

    --tile-scale: 1.4;
    --tile-width: 250px;
    --tile-gap: 20px;
    
    --tile-back-color: #333;
    --tile-border-color: #111;
    --tile-text-color: #bbb;
    --tile-reduced-color: #777;

    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
}

body {
    background: radial-gradient(circle at 33% 33%, var(--backlight-color), var(--background-color) 66%);
}

/* Layout Structure */
.container {
    position: relative;
    height: 100vh;
    cursor: grab;
    user-select: none;
}

.container:active {
    cursor: grabbing;
}

.header {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    user-select: none;
    position: relative;
    z-index: 10;
}

.footer {
    height: 50px;
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10;
}

/* Page Indicator */
.page-indicator {
    color: var(--tile-reduced-color);
    font-family: Arial, sans-serif;
    font-size: 28px;
    user-select: none;
}

/* Navigation Buttons */
.nav-button {
    background-color: var(--tile-back-color);
    border: 1px solid var(--tile-border-color);
    border-radius: 8px;
    color: var(--tile-text-color);
    cursor: pointer;
    padding: 12px 20px;
    font-size: 18px;
    transition: background-color 0.2s;
}

.nav-button:hover:not(:disabled) {
    background-color: #444;
}

.nav-button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.nav-button svg {
    display: block;
}

/* Grid Layout Container */
.layout-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 50px;
}

.layout {
    display: grid;
    grid-template-columns: repeat(var(--grid-cols), auto);
    grid-template-rows: repeat(var(--grid-rows), auto);
    gap: var(--tile-gap);
    max-height: 100vh;
    position: absolute;
    justify-items: center;
    align-items: center;
}

/* Tile Styles */
.iframe-wrapper {
    width: calc(var(--tile-width) * var(--tile-scale));
    height: calc(52px * var(--tile-scale));
    overflow: hidden;
    border: 1px solid var(--tile-border-color);
    border-radius: 4px;
    box-shadow: 6px 6px 8px rgba(0, 0, 0, 0.3);
    cursor: pointer;
}

.iframe-wrapper.empty {
    opacity: 0;
    cursor: default;
    pointer-events: none;
}

.iframe-wrapper.active {
    cursor: default;
}

/* Tile Placeholder */
.tile-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--tile-back-color);
    color: var(--tile-text-color);
    font-family: Arial, sans-serif;
    font-size: 20px;
    text-align: center;
    padding: 10px;
    box-sizing: border-box;
}

.tile-key {
    padding-left: 0.6em;
    font-size: 0.8em;
    color: var(--tile-reduced-color);
}

/* Iframe Styles */
iframe {
    width: calc(var(--tile-width) + 8px);
    margin-left: calc(-7px * var(--tile-scale));
    margin-top: calc(-58px * var(--tile-scale));
    border: none;
    transform: scale(var(--tile-scale));
    transform-origin: top left;
}