:root {
    --primary-color: #f7df1e; /* JS Yellow */
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --bg-color: #f4f7f9;
    --editor-bg: #2d2d2d; /* Dark theme for code */
    --text-color: #333;
    --editor-text-color: #f8f8f2;
    --border-color: #ddd;
    --line-number-color: #888;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

header h1 {
    color: #323330;
    background-color: var(--primary-color);
    display: inline-block;
    padding: 0 10px;
}

.main-content {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 30px;
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

.saved-sessions-container h2 {
    font-size: 1.2em;
    margin-top: 0;
    color: #555;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 5px;
}

#saved-sessions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.session-item {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    position: relative;
    padding-right: 30px;
}

.session-item:hover {
    border-color: #333;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.delete-session-btn {
    position: absolute;
    top: 50%;
    right: 8px;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #aaa;
    font-weight: bold;
}
.delete-session-btn:hover {
    color: var(--error-color);
}


.editor-wrapper {
    display: flex;
    flex-direction: column;
}

.toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.toolbar button {
    padding: 8px 15px;
    border: 1px solid var(--border-color);
    background-color: #fff;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s, color 0.2s;
}

.toolbar button:hover {
    background-color: #333;
    color: var(--primary-color);
    border-color: #333;
}

#save-btn {
    background-color: var(--success-color);
    color: #fff;
    border-color: var(--success-color);
}
#save-btn:hover {
    opacity: 0.9;
    background-color: var(--success-color);
    color: #fff;
}


.editor-container {
    display: flex;
    border: 1px solid #333;
    border-radius: 5px;
    overflow: hidden;
    height: 50vh;
    min-height: 400px;
    background-color: var(--editor-bg);
}

.line-numbers {
    padding: 10px 8px;
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    background-color: #222;
    text-align: right;
    color: var(--line-number-color);
    user-select: none;
    overflow: hidden;
}

#js-input {
    flex-grow: 1;
    border: none;
    padding: 10px;
    font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    outline: none;
    background-color: var(--editor-bg);
    color: var(--editor-text-color);
}

.result-box {
    margin-top: 15px;
    padding: 15px;
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.result-box.success {
    background-color: #eafaf1;
    border-left: 5px solid var(--success-color);
    color: #229954;
}

.result-box.error {
    background-color: #fdedec;
    border-left: 5px solid var(--error-color);
    color: #c43a2b;
}

.result-box.info {
    background-color: #f5f5f5;
    border-left: 5px solid #777;
    color: #555;
}


footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9em;
    color: #777;
}