/* Base layout */

body {
    font-family: system-ui, sans-serif;
    margin: 0;
    background: #f3f3f3;
}

#app {
    max-width: 1000px;
    margin: 16px auto;
    padding: 16px;
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.row {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid #dddddd;
}

/* Top row: maze and controls */

#top-row {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#mazeCanvas {
    border: 1px solid #999;
    background: #ddd;
}

#buttons {
    margin-top: 8px;
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

#buttons button {
    padding: 6px 12px;
    border-radius: 4px;
    border: 1px solid #555;
    background: #f5f5f5;
    cursor: pointer;
}

button:hover {
    background: #e7e7e7;
}

/* Middle row: code and output columns */

#middle-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.panel-title {
    margin: 0 0 4px 0;
    font-size: 15px;
    font-weight: 600;
}

textarea {
    width: 100%;
    box-sizing: border-box;
    min-height: 260px;
    resize: vertical;
    font-family: "Fira Code", Consolas, monospace;
    font-size: 13px;
    padding: 8px;
}

.code-editor {
    display: grid;
    grid-template-columns: 48px 1fr;
    align-items: stretch;
    height: 260px;
    min-height: 260px;
    resize: vertical;
    overflow: hidden;
    border: 1px solid #bbb;
}

#lineNumbers {
    margin: 0;
    padding: 8px 6px;
    overflow: hidden;
    text-align: right;
    user-select: none;
    color: #888;
    background: #f0f0f0;
    font-family: "Fira Code", Consolas, monospace;
    font-size: 13px;
    line-height: 1.4;
    height: 100%;
    min-height: 0;
    box-sizing: border-box;
    border: 0;
    border-right: 1px solid #bbb;
}

#code {
    border-left: none;
    line-height: 1.4;
    height: 100%;
    min-height: 0;
    resize: none;
    overflow: auto;
    border: 0;
}

#output {
    background: #111;
    color: #e2e2e2;
}

.middle-actions {
    grid-column: 1 / -1;
    display: flex;
    justify-content: center;
    margin-top: 8px;
}

.middle-actions #sampleBtn {
    padding: 8px 14px;
    border-radius: 4px;
    border: 1px solid #555;
    background: #f5f5f5;
    cursor: pointer;
    width: 220px;
    max-width: 70%;
}


/* Bottom row: single tabbed info panel */

.tabs {
    font-size: 13px;
}

.tabs-nav {
    display: flex;
    border-bottom: 1px solid #c8c8c8;
}

.tabs-nav button {
    flex: 1;
    padding: 6px 8px;
    text-align: center;
    cursor: pointer;
    background: #e7e7e7;
    border: 1px solid #c8c8c8;
    border-bottom: none;
    font-size: 13px;
    user-select: none;
}

.tabs-nav button + button {
    border-left: none;
}

.tabs-nav button.active {
    background: #ffffff;
    font-weight: 600;
}

.tabs-content {
    border: 1px solid #c8c8c8;
    border-top: none;
    background: #fafafa;
    padding: 8px 10px;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

.tabs-content ul {
    margin: 6px 0 6px 20px;
    padding: 0;
}

.tabs-content li {
    margin-bottom: 4px;
}

.tabs-content pre {
    background: #222;
    color: #f0f0f0;
    padding: 6px 8px;
    border-radius: 4px;
    font-size: 12px;
    overflow-x: auto;
    margin: 6px 0;
}

.tabs-content code {
    font-family: "Fira Code", Consolas, monospace;
}

.tab-section + .tab-section {
    border-top: 1px solid #dddddd;
    margin-top: 12px;
    padding-top: 12px;
}

.tab-section.has-image {
    display: grid;
    grid-template-columns: 1fr 240px;
    gap: 12px;
    align-items: start;
}

.tab-section-aside {
    border-left: 1px solid #dddddd;
    padding-left: 12px;
}

.tab-section-aside img {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid #c8c8c8;
    border-radius: 6px;
    background: #fff;
}


/* Responsive layout */

@media (max-width: 800px) {
    #middle-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 800px) {
    .tab-section.has-image {
        grid-template-columns: 1fr;
    }

    .tab-section-aside {
        border-left: 0;
        padding-left: 0;
        border-top: 1px solid #dddddd;
        padding-top: 10px;
    }
}